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Diffstat (limited to 'mpack.h')
| -rw-r--r-- | mpack.h | 7151 |
1 files changed, 7151 insertions, 0 deletions
@@ -0,0 +1,7151 @@ +/** + * The MIT License (MIT) + * + * Copyright (c) 2015-2018 Nicholas Fraser + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ + +/* + * This is the MPack 1.0 amalgamation package. + * + * http://github.com/ludocode/mpack + */ + +#ifndef MPACK_H +#define MPACK_H 1 + +#define MPACK_AMALGAMATED 1 +#define MPACK_RELEASE_VERSION 1 + +#if defined(MPACK_HAS_CONFIG) && MPACK_HAS_CONFIG +#include "mpack-config.h" +#endif + + +/* mpack/mpack-defaults.h.h */ + + +/** + * @name Features + * @{ + */ + +/** + * @def MPACK_READER + * + * Enables compilation of the base Tag Reader. + */ +#ifndef MPACK_READER +#define MPACK_READER 1 +#endif + +/** + * @def MPACK_EXPECT + * + * Enables compilation of the static Expect API. + */ +#ifndef MPACK_EXPECT +#define MPACK_EXPECT 1 +#endif + +/** + * @def MPACK_NODE + * + * Enables compilation of the dynamic Node API. + */ +#ifndef MPACK_NODE +#define MPACK_NODE 1 +#endif + +/** + * @def MPACK_WRITER + * + * Enables compilation of the Writer. + */ +#ifndef MPACK_WRITER +#define MPACK_WRITER 1 +#endif + +/** + * @def MPACK_COMPATIBILITY + * + * Enables compatibility features for reading and writing older + * versions of MessagePack. + * + * This is disabled by default. When disabled, the behaviour is equivalent to + * using the default version, @ref mpack_version_current. + * + * Enable this if you need to interoperate with applications or data that do + * not support the new (v5) MessagePack spec. See the section on v4 + * compatibility in @ref docs/protocol.md for more information. + */ +#ifndef MPACK_COMPATIBILITY +#define MPACK_COMPATIBILITY 0 +#endif + +/** + * @def MPACK_EXTENSIONS + * + * Enables the use of extension types. + * + * This is disabled by default. Define it to 1 to enable it. If disabled, + * functions to read and write extensions will not exist, and any occurrence of + * extension types in parsed messages will flag @ref mpack_error_invalid. + * + * MPack discourages the use of extension types. See the section on extension + * types in @ref docs/protocol.md for more information. + */ +#ifndef MPACK_EXTENSIONS +#define MPACK_EXTENSIONS 0 +#endif + + +/** + * @} + */ + + +/** + * @name Dependencies + * @{ + */ + +/** + * @def MPACK_HAS_CONFIG + * + * Enables the use of an @c mpack-config.h configuration file for MPack. + * This file must be in the same folder as @c mpack.h, or it must be + * available from your project's include paths. + */ +// This goes in your project settings. + +/** + * @def MPACK_STDLIB + * + * Enables the use of C stdlib. This allows the library to use malloc + * for debugging and in allocation helpers. + */ +#ifndef MPACK_STDLIB +#define MPACK_STDLIB 1 +#endif + +/** + * @def MPACK_STDIO + * + * Enables the use of C stdio. This adds helpers for easily + * reading/writing C files and makes debugging easier. + */ +#ifndef MPACK_STDIO +#define MPACK_STDIO 1 +#endif + +/** + * @} + */ + + +/** + * @name System Functions + * @{ + */ + +/** + * @def MPACK_MALLOC + * + * Defines the memory allocation function used by MPack. This is used by + * helpers for automatically allocating data the correct size, and for + * debugging functions. If this macro is undefined, the allocation helpers + * will not be compiled. + * + * The default is @c malloc() if @ref MPACK_STDLIB is enabled. + */ +/** + * @def MPACK_FREE + * + * Defines the memory free function used by MPack. This is used by helpers + * for automatically allocating data the correct size. If this macro is + * undefined, the allocation helpers will not be compiled. + * + * The default is @c free() if @ref MPACK_MALLOC has not been customized and + * @ref MPACK_STDLIB is enabled. + */ +/** + * @def MPACK_REALLOC + * + * Defines the realloc function used by MPack. It is used by growable + * buffers to resize more efficiently. + * + * The default is @c realloc() if @ref MPACK_MALLOC has not been customized and + * @ref MPACK_STDLIB is enabled. + * + * This is optional, even when @ref MPACK_MALLOC is used. If @ref MPACK_MALLOC is + * set and @ref MPACK_REALLOC is not, @ref MPACK_MALLOC is used with a simple copy + * to grow buffers. + */ +#if defined(MPACK_STDLIB) && MPACK_STDLIB && !defined(MPACK_MALLOC) +#define MPACK_MALLOC malloc +#define MPACK_REALLOC realloc +#define MPACK_FREE free +#endif + +/** + * @} + */ + + +/** + * @name Debugging Options + */ + +/** + * @def MPACK_DEBUG + * + * Enables debug features. You may want to wrap this around your + * own debug preprocs. By default, this is enabled if @c DEBUG or @c _DEBUG + * are defined. (@c NDEBUG is not used since it is allowed to have + * different values in different translation units.) + */ +#if !defined(MPACK_DEBUG) && (defined(DEBUG) || defined(_DEBUG)) +#define MPACK_DEBUG 1 +#endif + +/** + * @def MPACK_STRINGS + * + * Enables descriptive error and type strings. + * + * This can be turned off (by defining it to 0) to maximize space savings + * on embedded devices. If this is disabled, string functions such as + * mpack_error_to_string() and mpack_type_to_string() return an empty string. + */ +#ifndef MPACK_STRINGS +#define MPACK_STRINGS 1 +#endif + +/** + * Set this to 1 to implement a custom @ref mpack_assert_fail() function. + * See the documentation on @ref mpack_assert_fail() for details. + * + * Asserts are only used when @ref MPACK_DEBUG is enabled, and can be + * triggered by bugs in MPack or bugs due to incorrect usage of MPack. + */ +#ifndef MPACK_CUSTOM_ASSERT +#define MPACK_CUSTOM_ASSERT 0 +#endif + +/** + * @def MPACK_READ_TRACKING + * + * Enables compound type size tracking for readers. This ensures that the + * correct number of elements or bytes are read from a compound type. + * + * This is enabled by default in debug builds (provided a @c malloc() is + * available.) + */ +#if !defined(MPACK_READ_TRACKING) && \ + defined(MPACK_DEBUG) && MPACK_DEBUG && \ + defined(MPACK_READER) && MPACK_READER && \ + defined(MPACK_MALLOC) +#define MPACK_READ_TRACKING 1 +#endif + +/** + * @def MPACK_WRITE_TRACKING + * + * Enables compound type size tracking for writers. This ensures that the + * correct number of elements or bytes are written in a compound type. + * + * Note that without write tracking enabled, it is possible for buggy code + * to emit invalid MessagePack without flagging an error by writing the wrong + * number of elements or bytes in a compound type. With tracking enabled, + * MPack will catch such errors and break on the offending line of code. + * + * This is enabled by default in debug builds (provided a @c malloc() is + * available.) + */ +#if !defined(MPACK_WRITE_TRACKING) && \ + defined(MPACK_DEBUG) && MPACK_DEBUG && \ + defined(MPACK_WRITER) && MPACK_WRITER && \ + defined(MPACK_MALLOC) +#define MPACK_WRITE_TRACKING 1 +#endif + +/** + * @} + */ + + +/** + * @name Miscellaneous Options + * @{ + */ + +/** + * Whether to optimize for size or speed. + * + * Optimizing for size simplifies some parsing and encoding algorithms + * at the expense of speed, and saves a few kilobytes of space in the + * resulting executable. + * + * This automatically detects -Os with GCC/Clang. Unfortunately there + * doesn't seem to be a macro defined for /Os under MSVC. + */ +#ifndef MPACK_OPTIMIZE_FOR_SIZE +#ifdef __OPTIMIZE_SIZE__ +#define MPACK_OPTIMIZE_FOR_SIZE 1 +#else +#define MPACK_OPTIMIZE_FOR_SIZE 0 +#endif +#endif + +/** + * Stack space in bytes to use when initializing a reader or writer + * with a stack-allocated buffer. + */ +#ifndef MPACK_STACK_SIZE +#define MPACK_STACK_SIZE 4096 +#endif + +/** + * Buffer size to use for allocated buffers (such as for a file writer.) + * + * Starting with a single page and growing as needed seems to + * provide the best performance with minimal memory waste. + * Increasing this does not improve performance even when writing + * huge messages. + */ +#ifndef MPACK_BUFFER_SIZE +#define MPACK_BUFFER_SIZE 4096 +#endif + +/** + * Minimum size of an allocated node page in bytes. + * + * The children for a given compound element must be contiguous, so + * larger pages than this may be allocated as needed. (Safety checks + * exist to prevent malicious data from causing too large allocations.) + * + * See @ref mpack_node_data_t for the size of nodes. + * + * Using as many nodes fit in one memory page seems to provide the + * best performance, and has very little waste when parsing small + * messages. + */ +#ifndef MPACK_NODE_PAGE_SIZE +#define MPACK_NODE_PAGE_SIZE 4096 +#endif + +/** + * The initial depth for the node parser. When MPACK_MALLOC is available, + * the node parser has no practical depth limit, and it is not recursive + * so there is no risk of overflowing the call stack. + */ +#ifndef MPACK_NODE_INITIAL_DEPTH +#define MPACK_NODE_INITIAL_DEPTH 8 +#endif + +/** + * The maximum depth for the node parser if @ref MPACK_MALLOC is not available. + */ +#ifndef MPACK_NODE_MAX_DEPTH_WITHOUT_MALLOC +#define MPACK_NODE_MAX_DEPTH_WITHOUT_MALLOC 32 +#endif + +/** + * @} + */ + + +/** + * @} + */ + + +/* mpack/mpack-platform.h.h */ + +/** + * @file + * + * Abstracts all platform-specific code from MPack. This contains + * implementations of standard C functions when libc is not available, + * as well as wrappers to library functions. + */ + +#ifndef MPACK_PLATFORM_H +#define MPACK_PLATFORM_H 1 + + + +/* Pre-include checks */ + +#if defined(_MSC_VER) && _MSC_VER < 1800 && !defined(__cplusplus) +#error "In Visual Studio 2012 and earlier, MPack must be compiled as C++. Enable the /Tp compiler flag." +#endif + +#if defined(WIN32) && defined(MPACK_INTERNAL) && MPACK_INTERNAL +#define _CRT_SECURE_NO_WARNINGS 1 +#endif + + + +/* Doxygen preprocs */ +#if defined(MPACK_DOXYGEN) && MPACK_DOXYGEN +#define MPACK_HAS_CONFIG 0 +// We give these their default values of 0 here even though they are defined to +// 1 in the doxyfile. Doxygen will show this as the value in the docs, even +// though it ignores it when parsing the rest of the source. This is what we +// want, since we want the documentation to show these defaults but still +// generate documentation for the functions they add when they're on. +#define MPACK_COMPATIBILITY 0 +#define MPACK_EXTENSIONS 0 +#endif + + + +/* Include the custom config file if enabled */ + +#if defined(MPACK_HAS_CONFIG) && MPACK_HAS_CONFIG +/* #include "mpack-config.h" */ +#endif + +/* + * Now that the optional config is included, we define the defaults + * for any of the configuration options and other switches that aren't + * yet defined. + */ +#if defined(MPACK_DOXYGEN) && MPACK_DOXYGEN +/* #include "mpack-defaults-doxygen.h" */ +#else +/* #include "mpack-defaults.h" */ +#endif + +/* + * All remaining configuration options that have not yet been set must + * be defined here in order to support -Wundef. + */ +#ifndef MPACK_DEBUG +#define MPACK_DEBUG 0 +#endif +#ifndef MPACK_CUSTOM_BREAK +#define MPACK_CUSTOM_BREAK 0 +#endif +#ifndef MPACK_READ_TRACKING +#define MPACK_READ_TRACKING 0 +#endif +#ifndef MPACK_WRITE_TRACKING +#define MPACK_WRITE_TRACKING 0 +#endif +#ifndef MPACK_EMIT_INLINE_DEFS +#define MPACK_EMIT_INLINE_DEFS 0 +#endif +#ifndef MPACK_AMALGAMATED +#define MPACK_AMALGAMATED 0 +#endif +#ifndef MPACK_RELEASE_VERSION +#define MPACK_RELEASE_VERSION 0 +#endif +#ifndef MPACK_INTERNAL +#define MPACK_INTERNAL 0 +#endif +#ifndef MPACK_NO_BUILTINS +#define MPACK_NO_BUILTINS 0 +#endif + + + +/* System headers (based on configuration) */ + +#ifndef __STDC_LIMIT_MACROS +#define __STDC_LIMIT_MACROS 1 +#endif +#ifndef __STDC_FORMAT_MACROS +#define __STDC_FORMAT_MACROS 1 +#endif +#ifndef __STDC_CONSTANT_MACROS +#define __STDC_CONSTANT_MACROS 1 +#endif + +#include <stddef.h> +#include <stdint.h> +#include <stdbool.h> +#include <inttypes.h> +#include <limits.h> + +#if MPACK_STDLIB +#include <string.h> +#include <stdlib.h> +#endif + +#if MPACK_STDIO +#include <stdio.h> +#include <errno.h> +#endif + + + +/* + * Header configuration + */ + +#ifdef __cplusplus + #define MPACK_EXTERN_C_START extern "C" { + #define MPACK_EXTERN_C_END } +#else + #define MPACK_EXTERN_C_START /* nothing */ + #define MPACK_EXTERN_C_END /* nothing */ +#endif + +/* GCC versions from 4.6 to before 5.1 warn about defining a C99 + * non-static inline function before declaring it (see issue #20) */ +#ifdef __GNUC__ + #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) + #ifdef __cplusplus + #define MPACK_DECLARED_INLINE_WARNING_START \ + _Pragma ("GCC diagnostic push") \ + _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") + #else + #define MPACK_DECLARED_INLINE_WARNING_START \ + _Pragma ("GCC diagnostic push") \ + _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") + #endif + #define MPACK_DECLARED_INLINE_WARNING_END \ + _Pragma ("GCC diagnostic pop") + #endif +#endif +#ifndef MPACK_DECLARED_INLINE_WARNING_START + #define MPACK_DECLARED_INLINE_WARNING_START /* nothing */ + #define MPACK_DECLARED_INLINE_WARNING_END /* nothing */ +#endif + +/* GCC versions before 4.8 warn about shadowing a function with a + * variable that isn't a function or function pointer (like "index") */ +#ifdef __GNUC__ + #if (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 8) + #define MPACK_WSHADOW_WARNING_START \ + _Pragma ("GCC diagnostic push") \ + _Pragma ("GCC diagnostic ignored \"-Wshadow\"") + #define MPACK_WSHADOW_WARNING_END \ + _Pragma ("GCC diagnostic pop") + #endif +#endif +#ifndef MPACK_WSHADOW_WARNING_START + #define MPACK_WSHADOW_WARNING_START /* nothing */ + #define MPACK_WSHADOW_WARNING_END /* nothing */ +#endif + +#define MPACK_HEADER_START \ + MPACK_EXTERN_C_START \ + MPACK_WSHADOW_WARNING_START \ + MPACK_DECLARED_INLINE_WARNING_START + +#define MPACK_HEADER_END \ + MPACK_DECLARED_INLINE_WARNING_END \ + MPACK_WSHADOW_WARNING_END \ + MPACK_EXTERN_C_END + +MPACK_HEADER_START + + + +/* Miscellaneous helper macros */ + +#define MPACK_UNUSED(var) ((void)(var)) + +#define MPACK_STRINGIFY_IMPL(arg) #arg +#define MPACK_STRINGIFY(arg) MPACK_STRINGIFY_IMPL(arg) + +// This is a workaround for MSVC's incorrect expansion of __VA_ARGS__. It +// treats __VA_ARGS__ as a single preprocessor token when passed in the +// argument list of another macro unless we use an outer wrapper to expand it +// lexically first. (For safety/consistency we use this in all variadic macros +// that don't ignore the variadic arguments regardless of whether __VA_ARGS__ +// is passed to another macro.) +// https://stackoverflow.com/a/32400131 +#define MPACK_EXPAND(x) x + +// Extracts the first argument of a variadic macro list, where there might only +// be one argument. +#define MPACK_EXTRACT_ARG0_IMPL(first, ...) first +#define MPACK_EXTRACT_ARG0(...) MPACK_EXPAND(MPACK_EXTRACT_ARG0_IMPL( __VA_ARGS__ , ignored)) + +// Stringifies the first argument of a variadic macro list, where there might +// only be one argument. +#define MPACK_STRINGIFY_ARG0_impl(first, ...) #first +#define MPACK_STRINGIFY_ARG0(...) MPACK_EXPAND(MPACK_STRINGIFY_ARG0_impl( __VA_ARGS__ , ignored)) + + + +/* + * Definition of inline macros. + * + * MPack does not use static inline in header files; only one non-inline definition + * of each function should exist in the final build. This can reduce the binary size + * in cases where the compiler cannot or chooses not to inline a function. + * The addresses of functions should also compare equal across translation units + * regardless of whether they are declared inline. + * + * The above requirements mean that the declaration and definition of non-trivial + * inline functions must be separated so that the definitions will only + * appear when necessary. In addition, three different linkage models need + * to be supported: + * + * - The C99 model, where a standalone function is emitted only if there is any + * `extern inline` or non-`inline` declaration (including the definition itself) + * + * - The GNU model, where an `inline` definition emits a standalone function and an + * `extern inline` definition does not, regardless of other declarations + * + * - The C++ model, where `inline` emits a standalone function with special + * (COMDAT) linkage + * + * The macros below wrap up everything above. All inline functions defined in header + * files have a single non-inline definition emitted in the compilation of + * mpack-platform.c. All inline declarations and definitions use the same MPACK_INLINE + * specification to simplify the rules on when standalone functions are emitted. + * Inline functions in source files are defined MPACK_STATIC_INLINE. + * + * Additional reading: + * http://www.greenend.org.uk/rjk/tech/inline.html + */ + +#if defined(__cplusplus) + // C++ rules + // The linker will need COMDAT support to link C++ object files, + // so we don't need to worry about emitting definitions from C++ + // translation units. If mpack-platform.c (or the amalgamation) + // is compiled as C, its definition will be used, otherwise a + // C++ definition will be used, and no other C files will emit + // a defition. + #define MPACK_INLINE inline + +#elif defined(_MSC_VER) + // MSVC 2013 always uses COMDAT linkage, but it doesn't treat 'inline' as a + // keyword in C99 mode. (This appears to be fixed in a later version of + // MSVC but we don't bother detecting it.) + #define MPACK_INLINE __inline + #define MPACK_STATIC_INLINE static __inline + +#elif defined(__GNUC__) && (defined(__GNUC_GNU_INLINE__) || \ + !defined(__GNUC_STDC_INLINE__) && !defined(__GNUC_GNU_INLINE__)) + // GNU rules + #if MPACK_EMIT_INLINE_DEFS + #define MPACK_INLINE inline + #else + #define MPACK_INLINE extern inline + #endif + +#else + // C99 rules + #if MPACK_EMIT_INLINE_DEFS + #define MPACK_INLINE extern inline + #else + #define MPACK_INLINE inline + #endif +#endif + +#ifndef MPACK_STATIC_INLINE +#define MPACK_STATIC_INLINE static inline +#endif + +#ifdef MPACK_OPTIMIZE_FOR_SPEED + #error "You should define MPACK_OPTIMIZE_FOR_SIZE, not MPACK_OPTIMIZE_FOR_SPEED." +#endif + + + +/* + * Prevent inlining + * + * When a function is only used once, it is almost always inlined + * automatically. This can cause poor instruction cache usage because a + * function that should rarely be called (such as buffer exhaustion handling) + * will get inlined into the middle of a hot code path. + */ + +#if !MPACK_NO_BUILTINS + #if defined(_MSC_VER) + #define MPACK_NOINLINE __declspec(noinline) + #elif defined(__GNUC__) || defined(__clang__) + #define MPACK_NOINLINE __attribute__((noinline)) + #endif +#endif +#ifndef MPACK_NOINLINE + #define MPACK_NOINLINE /* nothing */ +#endif + + + +/* Some compiler-specific keywords and builtins */ + +#if !MPACK_NO_BUILTINS + #if defined(__GNUC__) || defined(__clang__) + #define MPACK_UNREACHABLE __builtin_unreachable() + #define MPACK_NORETURN(fn) fn __attribute__((noreturn)) + #define MPACK_RESTRICT __restrict__ + #elif defined(_MSC_VER) + #define MPACK_UNREACHABLE __assume(0) + #define MPACK_NORETURN(fn) __declspec(noreturn) fn + #define MPACK_RESTRICT __restrict + #endif +#endif + +#ifndef MPACK_RESTRICT +#ifdef __cplusplus +#define MPACK_RESTRICT /* nothing, unavailable in C++ */ +#else +#define MPACK_RESTRICT restrict /* required in C99 */ +#endif +#endif + +#ifndef MPACK_UNREACHABLE +#define MPACK_UNREACHABLE ((void)0) +#endif +#ifndef MPACK_NORETURN +#define MPACK_NORETURN(fn) fn +#endif + + + +/* + * Likely/unlikely + * + * These should only really be used when a branch is taken (or not taken) less + * than 1/1000th of the time. Buffer flush checks when writing very small + * elements are a good example. + */ + +#if !MPACK_NO_BUILTINS + #if defined(__GNUC__) || defined(__clang__) + #ifndef MPACK_LIKELY + #define MPACK_LIKELY(x) __builtin_expect((x),1) + #endif + #ifndef MPACK_UNLIKELY + #define MPACK_UNLIKELY(x) __builtin_expect((x),0) + #endif + #endif +#endif + +#ifndef MPACK_LIKELY + #define MPACK_LIKELY(x) (x) +#endif +#ifndef MPACK_UNLIKELY + #define MPACK_UNLIKELY(x) (x) +#endif + + + +/* Static assert */ + +#ifndef MPACK_STATIC_ASSERT + #if defined(__cplusplus) + #if __cplusplus >= 201103L + #define MPACK_STATIC_ASSERT static_assert + #endif + #elif defined(__STDC_VERSION__) + #if __STDC_VERSION__ >= 201112L + #define MPACK_STATIC_ASSERT _Static_assert + #endif + #endif +#endif + +#if !MPACK_NO_BUILTINS + #ifndef MPACK_STATIC_ASSERT + #if defined(__has_feature) + #if __has_feature(cxx_static_assert) + #define MPACK_STATIC_ASSERT static_assert + #elif __has_feature(c_static_assert) + #define MPACK_STATIC_ASSERT _Static_assert + #endif + #endif + #endif + + #ifndef MPACK_STATIC_ASSERT + #if defined(__GNUC__) + #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) + #ifndef __cplusplus + #if __GNUC__ >= 5 + #define MPACK_IGNORE_PEDANTIC "GCC diagnostic ignored \"-Wpedantic\"" + #else + #define MPACK_IGNORE_PEDANTIC "GCC diagnostic ignored \"-pedantic\"" + #endif + #define MPACK_STATIC_ASSERT(expr, str) do { \ + _Pragma ("GCC diagnostic push") \ + _Pragma (MPACK_IGNORE_PEDANTIC) \ + _Pragma ("GCC diagnostic ignored \"-Wc++-compat\"") \ + _Static_assert(expr, str); \ + _Pragma ("GCC diagnostic pop") \ + } while (0) + #endif + #endif + #endif + #endif + + #ifndef MPACK_STATIC_ASSERT + #ifdef _MSC_VER + #if _MSC_VER >= 1600 + #define MPACK_STATIC_ASSERT static_assert + #endif + #endif + #endif +#endif + +#ifndef MPACK_STATIC_ASSERT + #define MPACK_STATIC_ASSERT(expr, str) (MPACK_UNUSED(sizeof(char[1 - 2*!(expr)]))) +#endif + + + +/* _Generic */ + +#ifndef MPACK_HAS_GENERIC + #if defined(__clang__) && defined(__has_feature) + // With Clang we can test for _Generic support directly + // and ignore C/C++ version + #if __has_feature(c_generic_selections) + #define MPACK_HAS_GENERIC 1 + #else + #define MPACK_HAS_GENERIC 0 + #endif + #endif +#endif + +#ifndef MPACK_HAS_GENERIC + #if defined(__STDC_VERSION__) + #if __STDC_VERSION__ >= 201112L + #if defined(__GNUC__) && !defined(__clang__) + // GCC does not have full C11 support in GCC 4.7 and 4.8 + #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9) + #define MPACK_HAS_GENERIC 1 + #endif + #else + // We hope other compilers aren't lying about C11/_Generic support + #define MPACK_HAS_GENERIC 1 + #endif + #endif + #endif +#endif + +#ifndef MPACK_HAS_GENERIC + #define MPACK_HAS_GENERIC 0 +#endif + + + +/* + * Finite Math + * + * -ffinite-math-only, included in -ffast-math, breaks functions that + * that check for non-finite real values such as isnan() and isinf(). + * + * We should use this to trap errors when reading data that contains + * non-finite reals. This isn't currently implemented. + */ + +#ifndef MPACK_FINITE_MATH +#if defined(__FINITE_MATH_ONLY__) && __FINITE_MATH_ONLY__ +#define MPACK_FINITE_MATH 1 +#endif +#endif + +#ifndef MPACK_FINITE_MATH +#define MPACK_FINITE_MATH 0 +#endif + + + +/* + * Endianness checks + * + * These define MPACK_NHSWAP*() which swap network<->host byte + * order when needed. + * + * We leave them undefined if we can't determine the endianness + * at compile-time, in which case we fall back to bit-shifts. + * + * See the notes in mpack-common.h. + */ + +#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) + #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ + #define MPACK_NHSWAP16(x) (x) + #define MPACK_NHSWAP32(x) (x) + #define MPACK_NHSWAP64(x) (x) + #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + + #if !MPACK_NO_BUILTINS + #if defined(__clang__) + #ifdef __has_builtin + // Unlike the GCC builtins, the bswap builtins in Clang + // significantly improve ARM performance. + #if __has_builtin(__builtin_bswap16) + #define MPACK_NHSWAP16(x) __builtin_bswap16(x) + #endif + #if __has_builtin(__builtin_bswap32) + #define MPACK_NHSWAP32(x) __builtin_bswap32(x) + #endif + #if __has_builtin(__builtin_bswap64) + #define MPACK_NHSWAP64(x) __builtin_bswap64(x) + #endif + #endif + + #elif defined(__GNUC__) + + // The GCC bswap builtins are apparently poorly optimized on older + // versions of GCC, so we set a minimum version here just in case. + // http://hardwarebug.org/2010/01/14/beware-the-builtins/ + + #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) + #define MPACK_NHSWAP64(x) __builtin_bswap64(x) + #endif + + // __builtin_bswap16() was not implemented on all platforms + // until GCC 4.8.0: + // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624 + // + // The 16- and 32-bit versions in GCC significantly reduce performance + // on ARM with little effect on code size so we don't use them. + + #endif + #endif + #endif + +#elif defined(_MSC_VER) && defined(_WIN32) && !MPACK_NO_BUILTINS + + // On Windows, we assume x86 and x86_64 are always little-endian. + // We make no assumptions about ARM even though all current + // Windows Phone devices are little-endian in case Microsoft's + // compiler is ever used with a big-endian ARM device. + + #if defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) + #define MPACK_NHSWAP16(x) _byteswap_ushort(x) + #define MPACK_NHSWAP32(x) _byteswap_ulong(x) + #define MPACK_NHSWAP64(x) _byteswap_uint64(x) + #endif + +#endif + +#if defined(__FLOAT_WORD_ORDER__) && defined(__BYTE_ORDER__) + + // We check where possible that the float byte order matches the + // integer byte order. This is extremely unlikely to fail, but + // we check anyway just in case. + // + // (The static assert is placed in float/double encoders instead + // of here because our static assert fallback doesn't work at + // file scope) + + #define MPACK_CHECK_FLOAT_ORDER() \ + MPACK_STATIC_ASSERT(__FLOAT_WORD_ORDER__ == __BYTE_ORDER__, \ + "float byte order does not match int byte order! float/double " \ + "encoding is not properly implemented on this platform.") + +#endif + +#ifndef MPACK_CHECK_FLOAT_ORDER + #define MPACK_CHECK_FLOAT_ORDER() /* nothing */ +#endif + + +/* + * Here we define mpack_assert() and mpack_break(). They both work like a normal + * assertion function in debug mode, causing a trap or abort. However, on some platforms + * you can safely resume execution from mpack_break(), whereas mpack_assert() is + * always fatal. + * + * In release mode, mpack_assert() is converted to an assurance to the compiler + * that the expression cannot be false (via e.g. __assume() or __builtin_unreachable()) + * to improve optimization where supported. There is thus no point in "safely" handling + * the case of this being false. Writing mpack_assert(0) rarely makes sense (except + * possibly as a default handler in a switch) since the compiler will throw away any + * code after it. If at any time an mpack_assert() is not true, the behaviour is + * undefined. This also means the expression is evaluated even in release. + * + * mpack_break() on the other hand is compiled to nothing in release. It is + * used in situations where we want to highlight a programming error as early as + * possible (in the debugger), but we still handle the situation safely if it + * happens in release to avoid producing incorrect results (such as in + * MPACK_WRITE_TRACKING.) It does not take an expression to test because it + * belongs in a safe-handling block after its failing condition has been tested. + * + * If stdio is available, we can add a format string describing the error, and + * on some compilers we can declare it noreturn to get correct results from static + * analysis tools. Note that the format string and arguments are not evaluated unless + * the assertion is hit. + * + * Note that any arguments to mpack_assert() beyond the first are only evaluated + * if the expression is false (and are never evaluated in release.) + * + * mpack_assert_fail() and mpack_break_hit() are defined separately + * because assert is noreturn and break isn't. This distinction is very + * important for static analysis tools to give correct results. + */ + +#if MPACK_DEBUG + + /** + * @addtogroup config + * @{ + */ + /** + * @name Debug Functions + */ + /** + * Implement this and define @ref MPACK_CUSTOM_ASSERT to use a custom + * assertion function. + * + * This function should not return. If it does, MPack will @c abort(). + * + * If you use C++, make sure you include @c mpack.h where you define + * this to get the correct linkage (or define it <code>extern "C"</code>.) + * + * Asserts are only used when @ref MPACK_DEBUG is enabled, and can be + * triggered by bugs in MPack or bugs due to incorrect usage of MPack. + */ + void mpack_assert_fail(const char* message); + /** + * @} + */ + /** + * @} + */ + + MPACK_NORETURN(void mpack_assert_fail_wrapper(const char* message)); + #if MPACK_STDIO + MPACK_NORETURN(void mpack_assert_fail_format(const char* format, ...)); + #define mpack_assert_fail_at(line, file, exprstr, format, ...) \ + MPACK_EXPAND(mpack_assert_fail_format("mpack assertion failed at " file ":" #line "\n%s\n" format, exprstr, __VA_ARGS__)) + #else + #define mpack_assert_fail_at(line, file, exprstr, format, ...) \ + mpack_assert_fail_wrapper("mpack assertion failed at " file ":" #line "\n" exprstr "\n") + #endif + + #define mpack_assert_fail_pos(line, file, exprstr, expr, ...) \ + MPACK_EXPAND(mpack_assert_fail_at(line, file, exprstr, __VA_ARGS__)) + + // This contains a workaround to the pedantic C99 requirement of having at + // least one argument to a variadic macro. The first argument is the + // boolean expression, the optional second argument (if provided) must be a + // literal format string, and any additional arguments are the format + // argument list. + // + // Unfortunately this means macros are expanded in the expression before it + // gets stringified. I haven't found a workaround to this. + // + // This adds two unused arguments to the format argument list when a + // format string is provided, so this would complicate the use of + // -Wformat and __attribute__((format)) on mpack_assert_fail_format() if we + // ever bothered to implement it. + #define mpack_assert(...) \ + MPACK_EXPAND(((!(MPACK_EXTRACT_ARG0(__VA_ARGS__))) ? \ + mpack_assert_fail_pos(__LINE__, __FILE__, MPACK_STRINGIFY_ARG0(__VA_ARGS__) , __VA_ARGS__ , "", NULL) : \ + (void)0)) + + void mpack_break_hit(const char* message); + #if MPACK_STDIO + void mpack_break_hit_format(const char* format, ...); + #define mpack_break_hit_at(line, file, ...) \ + MPACK_EXPAND(mpack_break_hit_format("mpack breakpoint hit at " file ":" #line "\n" __VA_ARGS__)) + #else + #define mpack_break_hit_at(line, file, ...) \ + mpack_break_hit("mpack breakpoint hit at " file ":" #line ) + #endif + #define mpack_break_hit_pos(line, file, ...) MPACK_EXPAND(mpack_break_hit_at(line, file, __VA_ARGS__)) + #define mpack_break(...) MPACK_EXPAND(mpack_break_hit_pos(__LINE__, __FILE__, __VA_ARGS__)) +#else + #define mpack_assert(...) \ + (MPACK_EXPAND((!(MPACK_EXTRACT_ARG0(__VA_ARGS__))) ? \ + (MPACK_UNREACHABLE, (void)0) : \ + (void)0)) + #define mpack_break(...) ((void)0) +#endif + + + +/* Wrap some needed libc functions */ + +#if MPACK_STDLIB + #define mpack_memcmp memcmp + #define mpack_memcpy memcpy + #define mpack_memmove memmove + #define mpack_memset memset + #ifndef mpack_strlen + #define mpack_strlen strlen + #endif + + #if defined(MPACK_UNIT_TESTS) && MPACK_INTERNAL && defined(__GNUC__) + // make sure we don't use the stdlib directly during development + #undef memcmp + #undef memcpy + #undef memmove + #undef memset + #undef strlen + #undef malloc + #undef free + #pragma GCC poison memcmp + #pragma GCC poison memcpy + #pragma GCC poison memmove + #pragma GCC poison memset + #pragma GCC poison strlen + #pragma GCC poison malloc + #pragma GCC poison free + #endif + +#elif defined(__GNUC__) && !MPACK_NO_BUILTINS + // there's not always a builtin memmove for GCC, + // and we don't have a way to test for it + #define mpack_memcmp __builtin_memcmp + #define mpack_memcpy __builtin_memcpy + #define mpack_memset __builtin_memset + #define mpack_strlen __builtin_strlen + +#elif defined(__clang__) && defined(__has_builtin) && !MPACK_NO_BUILTINS + #if __has_builtin(__builtin_memcmp) + #define mpack_memcmp __builtin_memcmp + #endif + #if __has_builtin(__builtin_memcpy) + #define mpack_memcpy __builtin_memcpy + #endif + #if __has_builtin(__builtin_memmove) + #define mpack_memmove __builtin_memmove + #endif + #if __has_builtin(__builtin_memset) + #define mpack_memset __builtin_memset + #endif + #if __has_builtin(__builtin_strlen) + #define mpack_strlen __builtin_strlen + #endif +#endif + +#ifndef mpack_memcmp +int mpack_memcmp(const void* s1, const void* s2, size_t n); +#endif +#ifndef mpack_memcpy +void* mpack_memcpy(void* MPACK_RESTRICT s1, const void* MPACK_RESTRICT s2, size_t n); +#endif +#ifndef mpack_memmove +void* mpack_memmove(void* s1, const void* s2, size_t n); +#endif +#ifndef mpack_memset +void* mpack_memset(void* s, int c, size_t n); +#endif +#ifndef mpack_strlen +size_t mpack_strlen(const char* s); +#endif + +#if MPACK_STDIO + #if defined(WIN32) + #define mpack_snprintf _snprintf + #else + #define mpack_snprintf snprintf + #endif +#endif + + + +/* Debug logging */ +#if 0 + #include <stdio.h> + #define mpack_log(...) (MPACK_EXPAND(printf(__VA_ARGS__), fflush(stdout))) +#else + #define mpack_log(...) ((void)0) +#endif + + + +/* Make sure our configuration makes sense */ +#if defined(MPACK_MALLOC) && !defined(MPACK_FREE) + #error "MPACK_MALLOC requires MPACK_FREE." +#endif +#if !defined(MPACK_MALLOC) && defined(MPACK_FREE) + #error "MPACK_FREE requires MPACK_MALLOC." +#endif +#if MPACK_READ_TRACKING && !defined(MPACK_READER) + #error "MPACK_READ_TRACKING requires MPACK_READER." +#endif +#if MPACK_WRITE_TRACKING && !defined(MPACK_WRITER) + #error "MPACK_WRITE_TRACKING requires MPACK_WRITER." +#endif +#ifndef MPACK_MALLOC + #if MPACK_STDIO + #error "MPACK_STDIO requires preprocessor definitions for MPACK_MALLOC and MPACK_FREE." + #endif + #if MPACK_READ_TRACKING + #error "MPACK_READ_TRACKING requires preprocessor definitions for MPACK_MALLOC and MPACK_FREE." + #endif + #if MPACK_WRITE_TRACKING + #error "MPACK_WRITE_TRACKING requires preprocessor definitions for MPACK_MALLOC and MPACK_FREE." + #endif +#endif + + + +/* Implement realloc if unavailable */ +#ifdef MPACK_MALLOC + #ifdef MPACK_REALLOC + MPACK_INLINE void* mpack_realloc(void* old_ptr, size_t used_size, size_t new_size) { + MPACK_UNUSED(used_size); + return MPACK_REALLOC(old_ptr, new_size); + } + #else + void* mpack_realloc(void* old_ptr, size_t used_size, size_t new_size); + #endif +#endif + + + +/** + * @} + */ + +MPACK_HEADER_END + +#endif + + +/* mpack/mpack-common.h.h */ + +/** + * @file + * + * Defines types and functions shared by the MPack reader and writer. + */ + +#ifndef MPACK_COMMON_H +#define MPACK_COMMON_H 1 + +/* #include "mpack-platform.h" */ + +#ifndef MPACK_PRINT_BYTE_COUNT +#define MPACK_PRINT_BYTE_COUNT 12 +#endif + +MPACK_HEADER_START + + + +/** + * @defgroup common Tags and Common Elements + * + * Contains types, constants and functions shared by both the encoding + * and decoding portions of MPack. + * + * @{ + */ + +/* Version information */ + +#define MPACK_VERSION_MAJOR 1 /**< The major version number of MPack. */ +#define MPACK_VERSION_MINOR 0 /**< The minor version number of MPack. */ +#define MPACK_VERSION_PATCH 0 /**< The patch version number of MPack. */ + +/** A number containing the version number of MPack for comparison purposes. */ +#define MPACK_VERSION ((MPACK_VERSION_MAJOR * 10000) + \ + (MPACK_VERSION_MINOR * 100) + MPACK_VERSION_PATCH) + +/** A macro to test for a minimum version of MPack. */ +#define MPACK_VERSION_AT_LEAST(major, minor, patch) \ + (MPACK_VERSION >= (((major) * 10000) + ((minor) * 100) + (patch))) + +/** @cond */ +#if (MPACK_VERSION_PATCH > 0) +#define MPACK_VERSION_STRING_BASE \ + MPACK_STRINGIFY(MPACK_VERSION_MAJOR) "." \ + MPACK_STRINGIFY(MPACK_VERSION_MINOR) "." \ + MPACK_STRINGIFY(MPACK_VERSION_PATCH) +#else +#define MPACK_VERSION_STRING_BASE \ + MPACK_STRINGIFY(MPACK_VERSION_MAJOR) "." \ + MPACK_STRINGIFY(MPACK_VERSION_MINOR) +#endif +/** @endcond */ + +/** + * @def MPACK_VERSION_STRING + * @hideinitializer + * + * A string containing the MPack version. + */ +#if MPACK_RELEASE_VERSION +#define MPACK_VERSION_STRING MPACK_VERSION_STRING_BASE +#else +#define MPACK_VERSION_STRING MPACK_VERSION_STRING_BASE "dev" +#endif + +/** + * @def MPACK_LIBRARY_STRING + * @hideinitializer + * + * A string describing MPack, containing the library name, version and debug mode. + */ +#if MPACK_DEBUG +#define MPACK_LIBRARY_STRING "MPack " MPACK_VERSION_STRING "-debug" +#else +#define MPACK_LIBRARY_STRING "MPack " MPACK_VERSION_STRING +#endif + +/** @cond */ +/** + * @def MPACK_MAXIMUM_TAG_SIZE + * + * The maximum encoded size of a tag in bytes. + */ +#define MPACK_MAXIMUM_TAG_SIZE 9 +/** @endcond */ + +#if MPACK_EXTENSIONS +/** + * @def MPACK_TIMESTAMP_NANOSECONDS_MAX + * + * The maximum value of nanoseconds for a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +#define MPACK_TIMESTAMP_NANOSECONDS_MAX 999999999 +#endif + + + +#if MPACK_COMPATIBILITY +/** + * Versions of the MessagePack format. + * + * A reader, writer, or tree can be configured to serialize in an older + * version of the MessagePack spec. This is necessary to interface with + * older MessagePack libraries that do not support new MessagePack features. + * + * @note This requires @ref MPACK_COMPATIBILITY. + */ +typedef enum mpack_version_t { + + /** + * Version 1.0/v4, supporting only the @c raw type without @c str8. + */ + mpack_version_v4 = 4, + + /** + * Version 2.0/v5, supporting the @c str8, @c bin and @c ext types. + */ + mpack_version_v5 = 5, + + /** + * The most recent supported version of MessagePack. This is the default. + */ + mpack_version_current = mpack_version_v5, + +} mpack_version_t; +#endif + +/** + * Error states for MPack objects. + * + * When a reader, writer, or tree is in an error state, all subsequent calls + * are ignored and their return values are nil/zero. You should check whether + * the source is in an error state before using such values. + */ +typedef enum mpack_error_t { + mpack_ok = 0, /**< No error. */ + mpack_error_io = 2, /**< The reader or writer failed to fill or flush, or some other file or socket error occurred. */ + mpack_error_invalid, /**< The data read is not valid MessagePack. */ + mpack_error_unsupported, /**< The data read is not supported by this configuration of MPack. (See @ref MPACK_EXTENSIONS.) */ + mpack_error_type, /**< The type or value range did not match what was expected by the caller. */ + mpack_error_too_big, /**< A read or write was bigger than the maximum size allowed for that operation. */ + mpack_error_memory, /**< An allocation failure occurred. */ + mpack_error_bug, /**< The MPack API was used incorrectly. (This will always assert in debug mode.) */ + mpack_error_data, /**< The contained data is not valid. */ + mpack_error_eof, /**< The reader failed to read because of file or socket EOF */ +} mpack_error_t; + +/** + * Converts an MPack error to a string. This function returns an empty + * string when MPACK_DEBUG is not set. + */ +const char* mpack_error_to_string(mpack_error_t error); + +/** + * Defines the type of a MessagePack tag. + * + * Note that extension types, both user defined and built-in, are represented + * in tags as @ref mpack_type_ext. The value for an extension type is stored + * separately. + */ +typedef enum mpack_type_t { + mpack_type_missing = 0, /**< Special type indicating a missing optional value. */ + mpack_type_nil, /**< A null value. */ + mpack_type_bool, /**< A boolean (true or false.) */ + mpack_type_int, /**< A 64-bit signed integer. */ + mpack_type_uint, /**< A 64-bit unsigned integer. */ + mpack_type_float, /**< A 32-bit IEEE 754 floating point number. */ + mpack_type_double, /**< A 64-bit IEEE 754 floating point number. */ + mpack_type_str, /**< A string. */ + mpack_type_bin, /**< A chunk of binary data. */ + mpack_type_array, /**< An array of MessagePack objects. */ + mpack_type_map, /**< An ordered map of key/value pairs of MessagePack objects. */ + + #if MPACK_EXTENSIONS + /** + * A typed MessagePack extension object containing a chunk of binary data. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ + mpack_type_ext, + #endif +} mpack_type_t; + +/** + * Converts an MPack type to a string. This function returns an empty + * string when MPACK_DEBUG is not set. + */ +const char* mpack_type_to_string(mpack_type_t type); + +#if MPACK_EXTENSIONS +/** + * A timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +typedef struct mpack_timestamp_t { + int64_t seconds; /*< The number of seconds (signed) since 1970-01-01T00:00:00Z. */ + uint32_t nanoseconds; /*< The number of additional nanoseconds, between 0 and 999,999,999. */ +} mpack_timestamp_t; +#endif + +/** + * An MPack tag is a MessagePack object header. It is a variant type + * representing any kind of object, and includes the length of compound types + * (e.g. map, array, string) or the value of non-compound types (e.g. boolean, + * integer, float.) + * + * If the type is compound (str, bin, ext, array or map), the contained + * elements or bytes are stored separately. + * + * This structure is opaque; its fields should not be accessed outside + * of MPack. + */ +typedef struct mpack_tag_t mpack_tag_t; + +/* Hide internals from documentation */ +/** @cond */ +struct mpack_tag_t { + mpack_type_t type; /*< The type of value. */ + + #if MPACK_EXTENSIONS + int8_t exttype; /*< The extension type if the type is @ref mpack_type_ext. */ + #endif + + /* The value for non-compound types. */ + union { + uint64_t u; /*< The value if the type is unsigned int. */ + int64_t i; /*< The value if the type is signed int. */ + double d; /*< The value if the type is double. */ + float f; /*< The value if the type is float. */ + bool b; /*< The value if the type is bool. */ + + /* The number of bytes if the type is str, bin or ext. */ + uint32_t l; + + /* The element count if the type is an array, or the number of + key/value pairs if the type is map. */ + uint32_t n; + } v; +}; +/** @endcond */ + +/** + * @name Tag Generators + * @{ + */ + +/** + * @def MPACK_TAG_ZERO + * + * An @ref mpack_tag_t initializer that zeroes the given tag. + * + * @warning This does not make the tag nil! The tag's type is invalid when + * initialized this way. Use @ref mpack_tag_make_nil() to generate a nil tag. + */ +#if MPACK_EXTENSIONS +#define MPACK_TAG_ZERO {(mpack_type_t)0, 0, {0}} +#else +#define MPACK_TAG_ZERO {(mpack_type_t)0, {0}} +#endif + +/** Generates a nil tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_nil(void) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_nil; + return ret; +} + +/** Generates a bool tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_bool(bool value) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_bool; + ret.v.b = value; + return ret; +} + +/** Generates a bool tag with value true. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_true(void) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_bool; + ret.v.b = true; + return ret; +} + +/** Generates a bool tag with value false. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_false(void) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_bool; + ret.v.b = false; + return ret; +} + +/** Generates a signed int tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_int(int64_t value) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_int; + ret.v.i = value; + return ret; +} + +/** Generates an unsigned int tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_uint(uint64_t value) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_uint; + ret.v.u = value; + return ret; +} + +/** Generates a float tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_float(float value) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_float; + ret.v.f = value; + return ret; +} + +/** Generates a double tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_double(double value) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_double; + ret.v.d = value; + return ret; +} + +/** Generates an array tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_array(uint32_t count) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_array; + ret.v.n = count; + return ret; +} + +/** Generates a map tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_map(uint32_t count) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_map; + ret.v.n = count; + return ret; +} + +/** Generates a str tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_str(uint32_t length) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_str; + ret.v.l = length; + return ret; +} + +/** Generates a bin tag. */ +MPACK_INLINE mpack_tag_t mpack_tag_make_bin(uint32_t length) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_bin; + ret.v.l = length; + return ret; +} + +#if MPACK_EXTENSIONS +/** + * Generates an ext tag. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +MPACK_INLINE mpack_tag_t mpack_tag_make_ext(int8_t exttype, uint32_t length) { + mpack_tag_t ret = MPACK_TAG_ZERO; + ret.type = mpack_type_ext; + ret.exttype = exttype; + ret.v.l = length; + return ret; +} +#endif + +/** + * @} + */ + +/** + * @name Tag Querying Functions + * @{ + */ + +/** + * Gets the type of a tag. + */ +MPACK_INLINE mpack_type_t mpack_tag_type(mpack_tag_t* tag) { + return tag->type; +} + +/** + * Gets the boolean value of a bool-type tag. The tag must be of type @ref + * mpack_type_bool. + * + * This asserts that the type in the tag is @ref mpack_type_bool. (No check is + * performed if MPACK_DEBUG is not set.) + */ +MPACK_INLINE bool mpack_tag_bool_value(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_bool, "tag is not a bool!"); + return tag->v.b; +} + +/** + * Gets the signed integer value of an int-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_int. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @warning This does not convert between signed and unsigned tags! A positive + * integer may be stored in a tag as either @ref mpack_type_int or @ref + * mpack_type_uint. You must check the type first; this can only be used if the + * type is @ref mpack_type_int. + * + * @see mpack_type_int + */ +MPACK_INLINE int64_t mpack_tag_int_value(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_int, "tag is not an int!"); + return tag->v.i; +} + +/** + * Gets the unsigned integer value of a uint-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_uint. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @warning This does not convert between signed and unsigned tags! A positive + * integer may be stored in a tag as either @ref mpack_type_int or @ref + * mpack_type_uint. You must check the type first; this can only be used if the + * type is @ref mpack_type_uint. + * + * @see mpack_type_uint + */ +MPACK_INLINE uint64_t mpack_tag_uint_value(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_uint, "tag is not a uint!"); + return tag->v.u; +} + +/** + * Gets the float value of a float-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_float. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @warning This does not convert between float and double tags! This can only + * be used if the type is @ref mpack_type_float. + * + * @see mpack_type_float + */ +MPACK_INLINE float mpack_tag_float_value(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_float, "tag is not a float!"); + return tag->v.f; +} + +/** + * Gets the double value of a double-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_double. (No check + * is performed if MPACK_DEBUG is not set.) + * + * @warning This does not convert between float and double tags! This can only + * be used if the type is @ref mpack_type_double. + * + * @see mpack_type_double + */ +MPACK_INLINE double mpack_tag_double_value(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_double, "tag is not a double!"); + return tag->v.d; +} + +/** + * Gets the number of elements in an array tag. + * + * This asserts that the type in the tag is @ref mpack_type_array. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @see mpack_type_array + */ +MPACK_INLINE uint32_t mpack_tag_array_count(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_array, "tag is not an array!"); + return tag->v.n; +} + +/** + * Gets the number of key-value pairs in a map tag. + * + * This asserts that the type in the tag is @ref mpack_type_map. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @see mpack_type_map + */ +MPACK_INLINE uint32_t mpack_tag_map_count(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_map, "tag is not a map!"); + return tag->v.n; +} + +/** + * Gets the length in bytes of a str-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_str. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @see mpack_type_str + */ +MPACK_INLINE uint32_t mpack_tag_str_length(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_str, "tag is not a str!"); + return tag->v.l; +} + +/** + * Gets the length in bytes of a bin-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_bin. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @see mpack_type_bin + */ +MPACK_INLINE uint32_t mpack_tag_bin_length(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_bin, "tag is not a bin!"); + return tag->v.l; +} + +#if MPACK_EXTENSIONS +/** + * Gets the length in bytes of an ext-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_ext. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @see mpack_type_ext + */ +MPACK_INLINE uint32_t mpack_tag_ext_length(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_ext, "tag is not an ext!"); + return tag->v.l; +} + +/** + * Gets the extension type (exttype) of an ext-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_ext. (No check is + * performed if MPACK_DEBUG is not set.) + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @see mpack_type_ext + */ +MPACK_INLINE int8_t mpack_tag_ext_exttype(mpack_tag_t* tag) { + mpack_assert(tag->type == mpack_type_ext, "tag is not an ext!"); + return tag->exttype; +} +#endif + +/** + * Gets the length in bytes of a str-, bin- or ext-type tag. + * + * This asserts that the type in the tag is @ref mpack_type_str, @ref + * mpack_type_bin or @ref mpack_type_ext. (No check is performed if MPACK_DEBUG + * is not set.) + * + * @see mpack_type_str + * @see mpack_type_bin + * @see mpack_type_ext + */ +MPACK_INLINE uint32_t mpack_tag_bytes(mpack_tag_t* tag) { + #if MPACK_EXTENSIONS + mpack_assert(tag->type == mpack_type_str || tag->type == mpack_type_bin + || tag->type == mpack_type_ext, "tag is not a str, bin or ext!"); + #else + mpack_assert(tag->type == mpack_type_str || tag->type == mpack_type_bin, + "tag is not a str or bin!"); + #endif + return tag->v.l; +} + +/** + * @} + */ + +/** + * @name Other tag functions + * @{ + */ + +#if MPACK_EXTENSIONS +/** + * The extension type for a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +#define MPACK_EXTTYPE_TIMESTAMP ((int8_t)(-1)) +#endif + +/** + * Compares two tags with an arbitrary fixed ordering. Returns 0 if the tags are + * equal, a negative integer if left comes before right, or a positive integer + * otherwise. + * + * \warning The ordering is not guaranteed to be preserved across MPack versions; do + * not rely on it in persistent data. + * + * \warning Floating point numbers are compared bit-for-bit, not using the language's + * operator==. This means that NaNs with matching representation will compare equal. + * This behaviour is up for debate; see comments in the definition of mpack_tag_cmp(). + * + * See mpack_tag_equal() for more information on when tags are considered equal. + */ +int mpack_tag_cmp(mpack_tag_t left, mpack_tag_t right); + +/** + * Compares two tags for equality. Tags are considered equal if the types are compatible + * and the values (for non-compound types) are equal. + * + * The field width of variable-width fields is ignored (and in fact is not stored + * in a tag), and positive numbers in signed integers are considered equal to their + * unsigned counterparts. So for example the value 1 stored as a positive fixint + * is equal to the value 1 stored in a 64-bit unsigned integer field. + * + * The "extension type" of an extension object is considered part of the value + * and must match exactly. + * + * \warning Floating point numbers are compared bit-for-bit, not using the language's + * operator==. This means that NaNs with matching representation will compare equal. + * This behaviour is up for debate; see comments in the definition of mpack_tag_cmp(). + */ +MPACK_INLINE bool mpack_tag_equal(mpack_tag_t left, mpack_tag_t right) { + return mpack_tag_cmp(left, right) == 0; +} + +#if MPACK_DEBUG && MPACK_STDIO +/** + * Generates a json-like debug description of the given tag into the given buffer. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + * + * The prefix is used to print the first few hexadecimal bytes of a bin or ext + * type. Pass NULL if not a bin or ext. + */ +void mpack_tag_debug_pseudo_json(mpack_tag_t tag, char* buffer, size_t buffer_size, + const char* prefix, size_t prefix_size); + +/** + * Generates a debug string description of the given tag into the given buffer. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_tag_debug_describe(mpack_tag_t tag, char* buffer, size_t buffer_size); + +/** @cond */ + +/* + * A callback function for printing pseudo-JSON for debugging purposes. + * + * @see mpack_node_print_callback + */ +typedef void (*mpack_print_callback_t)(void* context, const char* data, size_t count); + +// helpers for printing debug output +// i feel a bit like i'm re-implementing a buffered writer again... +typedef struct mpack_print_t { + char* buffer; + size_t size; + size_t count; + mpack_print_callback_t callback; + void* context; +} mpack_print_t; + +void mpack_print_append(mpack_print_t* print, const char* data, size_t count); + +MPACK_INLINE void mpack_print_append_cstr(mpack_print_t* print, const char* cstr) { + mpack_print_append(print, cstr, mpack_strlen(cstr)); +} + +void mpack_print_flush(mpack_print_t* print); + +void mpack_print_file_callback(void* context, const char* data, size_t count); + +/** @endcond */ + +#endif + +/** + * @} + */ + +/** + * @name Deprecated Tag Generators + * @{ + */ + +/* + * "make" has been added to their names to disambiguate them from the + * value-fetching functions (e.g. mpack_tag_make_bool() vs + * mpack_tag_bool_value().) + * + * The length and count for all compound types was the wrong sign (int32_t + * instead of uint32_t.) These preserve the old behaviour; the new "make" + * functions have the correct sign. + */ + +/** \deprecated Renamed to mpack_tag_make_nil(). */ +MPACK_INLINE mpack_tag_t mpack_tag_nil(void) { + return mpack_tag_make_nil(); +} + +/** \deprecated Renamed to mpack_tag_make_bool(). */ +MPACK_INLINE mpack_tag_t mpack_tag_bool(bool value) { + return mpack_tag_make_bool(value); +} + +/** \deprecated Renamed to mpack_tag_make_true(). */ +MPACK_INLINE mpack_tag_t mpack_tag_true(void) { + return mpack_tag_make_true(); +} + +/** \deprecated Renamed to mpack_tag_make_false(). */ +MPACK_INLINE mpack_tag_t mpack_tag_false(void) { + return mpack_tag_make_false(); +} + +/** \deprecated Renamed to mpack_tag_make_int(). */ +MPACK_INLINE mpack_tag_t mpack_tag_int(int64_t value) { + return mpack_tag_make_int(value); +} + +/** \deprecated Renamed to mpack_tag_make_uint(). */ +MPACK_INLINE mpack_tag_t mpack_tag_uint(uint64_t value) { + return mpack_tag_make_uint(value); +} + +/** \deprecated Renamed to mpack_tag_make_float(). */ +MPACK_INLINE mpack_tag_t mpack_tag_float(float value) { + return mpack_tag_make_float(value); +} + +/** \deprecated Renamed to mpack_tag_make_double(). */ +MPACK_INLINE mpack_tag_t mpack_tag_double(double value) { + return mpack_tag_make_double(value); +} + +/** \deprecated Renamed to mpack_tag_make_array(). */ +MPACK_INLINE mpack_tag_t mpack_tag_array(int32_t count) { + return mpack_tag_make_array((uint32_t)count); +} + +/** \deprecated Renamed to mpack_tag_make_map(). */ +MPACK_INLINE mpack_tag_t mpack_tag_map(int32_t count) { + return mpack_tag_make_map((uint32_t)count); +} + +/** \deprecated Renamed to mpack_tag_make_str(). */ +MPACK_INLINE mpack_tag_t mpack_tag_str(int32_t length) { + return mpack_tag_make_str((uint32_t)length); +} + +/** \deprecated Renamed to mpack_tag_make_bin(). */ +MPACK_INLINE mpack_tag_t mpack_tag_bin(int32_t length) { + return mpack_tag_make_bin((uint32_t)length); +} + +#if MPACK_EXTENSIONS +/** \deprecated Renamed to mpack_tag_make_ext(). */ +MPACK_INLINE mpack_tag_t mpack_tag_ext(int8_t exttype, int32_t length) { + return mpack_tag_make_ext(exttype, (uint32_t)length); +} +#endif + +/** + * @} + */ + +/** @cond */ + +/* + * Helpers to perform unaligned network-endian loads and stores + * at arbitrary addresses. Byte-swapping builtins are used if they + * are available and if they improve performance. + * + * These will remain available in the public API so feel free to + * use them for other purposes, but they are undocumented. + */ + +MPACK_INLINE uint8_t mpack_load_u8(const char* p) { + return (uint8_t)p[0]; +} + +MPACK_INLINE uint16_t mpack_load_u16(const char* p) { + #ifdef MPACK_NHSWAP16 + uint16_t val; + mpack_memcpy(&val, p, sizeof(val)); + return MPACK_NHSWAP16(val); + #else + return (uint16_t)((((uint16_t)(uint8_t)p[0]) << 8) | + ((uint16_t)(uint8_t)p[1])); + #endif +} + +MPACK_INLINE uint32_t mpack_load_u32(const char* p) { + #ifdef MPACK_NHSWAP32 + uint32_t val; + mpack_memcpy(&val, p, sizeof(val)); + return MPACK_NHSWAP32(val); + #else + return (((uint32_t)(uint8_t)p[0]) << 24) | + (((uint32_t)(uint8_t)p[1]) << 16) | + (((uint32_t)(uint8_t)p[2]) << 8) | + ((uint32_t)(uint8_t)p[3]); + #endif +} + +MPACK_INLINE uint64_t mpack_load_u64(const char* p) { + #ifdef MPACK_NHSWAP64 + uint64_t val; + mpack_memcpy(&val, p, sizeof(val)); + return MPACK_NHSWAP64(val); + #else + return (((uint64_t)(uint8_t)p[0]) << 56) | + (((uint64_t)(uint8_t)p[1]) << 48) | + (((uint64_t)(uint8_t)p[2]) << 40) | + (((uint64_t)(uint8_t)p[3]) << 32) | + (((uint64_t)(uint8_t)p[4]) << 24) | + (((uint64_t)(uint8_t)p[5]) << 16) | + (((uint64_t)(uint8_t)p[6]) << 8) | + ((uint64_t)(uint8_t)p[7]); + #endif +} + +MPACK_INLINE void mpack_store_u8(char* p, uint8_t val) { + uint8_t* u = (uint8_t*)p; + u[0] = val; +} + +MPACK_INLINE void mpack_store_u16(char* p, uint16_t val) { + #ifdef MPACK_NHSWAP16 + val = MPACK_NHSWAP16(val); + mpack_memcpy(p, &val, sizeof(val)); + #else + uint8_t* u = (uint8_t*)p; + u[0] = (uint8_t)((val >> 8) & 0xFF); + u[1] = (uint8_t)( val & 0xFF); + #endif +} + +MPACK_INLINE void mpack_store_u32(char* p, uint32_t val) { + #ifdef MPACK_NHSWAP32 + val = MPACK_NHSWAP32(val); + mpack_memcpy(p, &val, sizeof(val)); + #else + uint8_t* u = (uint8_t*)p; + u[0] = (uint8_t)((val >> 24) & 0xFF); + u[1] = (uint8_t)((val >> 16) & 0xFF); + u[2] = (uint8_t)((val >> 8) & 0xFF); + u[3] = (uint8_t)( val & 0xFF); + #endif +} + +MPACK_INLINE void mpack_store_u64(char* p, uint64_t val) { + #ifdef MPACK_NHSWAP64 + val = MPACK_NHSWAP64(val); + mpack_memcpy(p, &val, sizeof(val)); + #else + uint8_t* u = (uint8_t*)p; + u[0] = (uint8_t)((val >> 56) & 0xFF); + u[1] = (uint8_t)((val >> 48) & 0xFF); + u[2] = (uint8_t)((val >> 40) & 0xFF); + u[3] = (uint8_t)((val >> 32) & 0xFF); + u[4] = (uint8_t)((val >> 24) & 0xFF); + u[5] = (uint8_t)((val >> 16) & 0xFF); + u[6] = (uint8_t)((val >> 8) & 0xFF); + u[7] = (uint8_t)( val & 0xFF); + #endif +} + +MPACK_INLINE int8_t mpack_load_i8 (const char* p) {return (int8_t) mpack_load_u8 (p);} +MPACK_INLINE int16_t mpack_load_i16(const char* p) {return (int16_t)mpack_load_u16(p);} +MPACK_INLINE int32_t mpack_load_i32(const char* p) {return (int32_t)mpack_load_u32(p);} +MPACK_INLINE int64_t mpack_load_i64(const char* p) {return (int64_t)mpack_load_u64(p);} +MPACK_INLINE void mpack_store_i8 (char* p, int8_t val) {mpack_store_u8 (p, (uint8_t) val);} +MPACK_INLINE void mpack_store_i16(char* p, int16_t val) {mpack_store_u16(p, (uint16_t)val);} +MPACK_INLINE void mpack_store_i32(char* p, int32_t val) {mpack_store_u32(p, (uint32_t)val);} +MPACK_INLINE void mpack_store_i64(char* p, int64_t val) {mpack_store_u64(p, (uint64_t)val);} + +MPACK_INLINE float mpack_load_float(const char* p) { + MPACK_CHECK_FLOAT_ORDER(); + MPACK_STATIC_ASSERT(sizeof(float) == sizeof(uint32_t), "float is wrong size??"); + union { + float f; + uint32_t u; + } v; + v.u = mpack_load_u32(p); + return v.f; +} + +MPACK_INLINE double mpack_load_double(const char* p) { + MPACK_CHECK_FLOAT_ORDER(); + MPACK_STATIC_ASSERT(sizeof(double) == sizeof(uint64_t), "double is wrong size??"); + union { + double d; + uint64_t u; + } v; + v.u = mpack_load_u64(p); + return v.d; +} + +MPACK_INLINE void mpack_store_float(char* p, float value) { + MPACK_CHECK_FLOAT_ORDER(); + union { + float f; + uint32_t u; + } v; + v.f = value; + mpack_store_u32(p, v.u); +} + +MPACK_INLINE void mpack_store_double(char* p, double value) { + MPACK_CHECK_FLOAT_ORDER(); + union { + double d; + uint64_t u; + } v; + v.d = value; + mpack_store_u64(p, v.u); +} + +/** @endcond */ + + + +/** @cond */ + +// Sizes in bytes for the various possible tags +#define MPACK_TAG_SIZE_FIXUINT 1 +#define MPACK_TAG_SIZE_U8 2 +#define MPACK_TAG_SIZE_U16 3 +#define MPACK_TAG_SIZE_U32 5 +#define MPACK_TAG_SIZE_U64 9 +#define MPACK_TAG_SIZE_FIXINT 1 +#define MPACK_TAG_SIZE_I8 2 +#define MPACK_TAG_SIZE_I16 3 +#define MPACK_TAG_SIZE_I32 5 +#define MPACK_TAG_SIZE_I64 9 +#define MPACK_TAG_SIZE_FLOAT 5 +#define MPACK_TAG_SIZE_DOUBLE 9 +#define MPACK_TAG_SIZE_FIXARRAY 1 +#define MPACK_TAG_SIZE_ARRAY16 3 +#define MPACK_TAG_SIZE_ARRAY32 5 +#define MPACK_TAG_SIZE_FIXMAP 1 +#define MPACK_TAG_SIZE_MAP16 3 +#define MPACK_TAG_SIZE_MAP32 5 +#define MPACK_TAG_SIZE_FIXSTR 1 +#define MPACK_TAG_SIZE_STR8 2 +#define MPACK_TAG_SIZE_STR16 3 +#define MPACK_TAG_SIZE_STR32 5 +#define MPACK_TAG_SIZE_BIN8 2 +#define MPACK_TAG_SIZE_BIN16 3 +#define MPACK_TAG_SIZE_BIN32 5 +#define MPACK_TAG_SIZE_FIXEXT1 2 +#define MPACK_TAG_SIZE_FIXEXT2 2 +#define MPACK_TAG_SIZE_FIXEXT4 2 +#define MPACK_TAG_SIZE_FIXEXT8 2 +#define MPACK_TAG_SIZE_FIXEXT16 2 +#define MPACK_TAG_SIZE_EXT8 3 +#define MPACK_TAG_SIZE_EXT16 4 +#define MPACK_TAG_SIZE_EXT32 6 + +// size in bytes for complete ext types +#define MPACK_EXT_SIZE_TIMESTAMP4 (MPACK_TAG_SIZE_FIXEXT4 + 4) +#define MPACK_EXT_SIZE_TIMESTAMP8 (MPACK_TAG_SIZE_FIXEXT8 + 8) +#define MPACK_EXT_SIZE_TIMESTAMP12 (MPACK_TAG_SIZE_EXT8 + 12) + +/** @endcond */ + + + +#if MPACK_READ_TRACKING || MPACK_WRITE_TRACKING +/* Tracks the write state of compound elements (maps, arrays, */ +/* strings, binary blobs and extension types) */ +/** @cond */ + +typedef struct mpack_track_element_t { + mpack_type_t type; + uint64_t left; // we need 64-bit because (2 * INT32_MAX) elements can be stored in a map +} mpack_track_element_t; + +typedef struct mpack_track_t { + size_t count; + size_t capacity; + mpack_track_element_t* elements; +} mpack_track_t; + +#if MPACK_INTERNAL +mpack_error_t mpack_track_init(mpack_track_t* track); +mpack_error_t mpack_track_grow(mpack_track_t* track); +mpack_error_t mpack_track_push(mpack_track_t* track, mpack_type_t type, uint64_t count); +mpack_error_t mpack_track_pop(mpack_track_t* track, mpack_type_t type); +mpack_error_t mpack_track_element(mpack_track_t* track, bool read); +mpack_error_t mpack_track_peek_element(mpack_track_t* track, bool read); +mpack_error_t mpack_track_bytes(mpack_track_t* track, bool read, uint64_t count); +mpack_error_t mpack_track_str_bytes_all(mpack_track_t* track, bool read, uint64_t count); +mpack_error_t mpack_track_check_empty(mpack_track_t* track); +mpack_error_t mpack_track_destroy(mpack_track_t* track, bool cancel); +#endif + +/** @endcond */ +#endif + + + +#if MPACK_INTERNAL +/** @cond */ + + + +/* Miscellaneous string functions */ + +/** + * Returns true if the given UTF-8 string is valid. + */ +bool mpack_utf8_check(const char* str, size_t bytes); + +/** + * Returns true if the given UTF-8 string is valid and contains no null characters. + */ +bool mpack_utf8_check_no_null(const char* str, size_t bytes); + +/** + * Returns true if the given string has no null bytes. + */ +bool mpack_str_check_no_null(const char* str, size_t bytes); + + + +/** @endcond */ +#endif + + + +/** + * @} + */ + +/** + * @} + */ + +MPACK_HEADER_END + +#endif + + +/* mpack/mpack-writer.h.h */ + +/** + * @file + * + * Declares the MPack Writer. + */ + +#ifndef MPACK_WRITER_H +#define MPACK_WRITER_H 1 + +/* #include "mpack-common.h" */ + +MPACK_HEADER_START + +#if MPACK_WRITER + +#if MPACK_WRITE_TRACKING +struct mpack_track_t; +#endif + +/** + * @defgroup writer Write API + * + * The MPack Write API encodes structured data of a fixed (hardcoded) schema to MessagePack. + * + * @{ + */ + +/** + * @def MPACK_WRITER_MINIMUM_BUFFER_SIZE + * + * The minimum buffer size for a writer with a flush function. + */ +#define MPACK_WRITER_MINIMUM_BUFFER_SIZE 32 + +/** + * A buffered MessagePack encoder. + * + * The encoder wraps an existing buffer and, optionally, a flush function. + * This allows efficiently encoding to an in-memory buffer or to a stream. + * + * All write operations are synchronous; they will block until the + * data is fully written, or an error occurs. + */ +typedef struct mpack_writer_t mpack_writer_t; + +/** + * The MPack writer's flush function to flush the buffer to the output stream. + * It should flag an appropriate error on the writer if flushing fails (usually + * mpack_error_io or mpack_error_memory.) + * + * The specified context for callbacks is at writer->context. + */ +typedef void (*mpack_writer_flush_t)(mpack_writer_t* writer, const char* buffer, size_t count); + +/** + * An error handler function to be called when an error is flagged on + * the writer. + * + * The error handler will only be called once on the first error flagged; + * any subsequent writes and errors are ignored, and the writer is + * permanently in that error state. + * + * MPack is safe against non-local jumps out of error handler callbacks. + * This means you are allowed to longjmp or throw an exception (in C++, + * Objective-C, or with SEH) out of this callback. + * + * Bear in mind when using longjmp that local non-volatile variables that + * have changed are undefined when setjmp() returns, so you can't put the + * writer on the stack in the same activation frame as the setjmp without + * declaring it volatile. + * + * You must still eventually destroy the writer. It is not destroyed + * automatically when an error is flagged. It is safe to destroy the + * writer within this error callback, but you will either need to perform + * a non-local jump, or store something in your context to identify + * that the writer is destroyed since any future accesses to it cause + * undefined behavior. + */ +typedef void (*mpack_writer_error_t)(mpack_writer_t* writer, mpack_error_t error); + +/** + * A teardown function to be called when the writer is destroyed. + */ +typedef void (*mpack_writer_teardown_t)(mpack_writer_t* writer); + +/* Hide internals from documentation */ +/** @cond */ + +struct mpack_writer_t { + #if MPACK_COMPATIBILITY + mpack_version_t version; /* Version of the MessagePack spec to write */ + #endif + mpack_writer_flush_t flush; /* Function to write bytes to the output stream */ + mpack_writer_error_t error_fn; /* Function to call on error */ + mpack_writer_teardown_t teardown; /* Function to teardown the context on destroy */ + void* context; /* Context for writer callbacks */ + + char* buffer; /* Byte buffer */ + char* current; /* Current position within the buffer */ + char* end; /* The end of the buffer */ + mpack_error_t error; /* Error state */ + + #if MPACK_WRITE_TRACKING + mpack_track_t track; /* Stack of map/array/str/bin/ext writes */ + #endif + + #ifdef MPACK_MALLOC + /* Reserved. You can use this space to allocate a custom + * context in order to reduce heap allocations. */ + void* reserved[2]; + #endif +}; + +#if MPACK_WRITE_TRACKING +void mpack_writer_track_push(mpack_writer_t* writer, mpack_type_t type, uint64_t count); +void mpack_writer_track_pop(mpack_writer_t* writer, mpack_type_t type); +void mpack_writer_track_element(mpack_writer_t* writer); +void mpack_writer_track_bytes(mpack_writer_t* writer, size_t count); +#else +MPACK_INLINE void mpack_writer_track_push(mpack_writer_t* writer, mpack_type_t type, uint64_t count) { + MPACK_UNUSED(writer); + MPACK_UNUSED(type); + MPACK_UNUSED(count); +} +MPACK_INLINE void mpack_writer_track_pop(mpack_writer_t* writer, mpack_type_t type) { + MPACK_UNUSED(writer); + MPACK_UNUSED(type); +} +MPACK_INLINE void mpack_writer_track_element(mpack_writer_t* writer) { + MPACK_UNUSED(writer); +} +MPACK_INLINE void mpack_writer_track_bytes(mpack_writer_t* writer, size_t count) { + MPACK_UNUSED(writer); + MPACK_UNUSED(count); +} +#endif + +/** @endcond */ + +/** + * @name Lifecycle Functions + * @{ + */ + +/** + * Initializes an MPack writer with the given buffer. The writer + * does not assume ownership of the buffer. + * + * Trying to write past the end of the buffer will result in mpack_error_too_big + * unless a flush function is set with mpack_writer_set_flush(). To use the data + * without flushing, call mpack_writer_buffer_used() to determine the number of + * bytes written. + * + * @param writer The MPack writer. + * @param buffer The buffer into which to write MessagePack data. + * @param size The size of the buffer. + */ +void mpack_writer_init(mpack_writer_t* writer, char* buffer, size_t size); + +#ifdef MPACK_MALLOC +/** + * Initializes an MPack writer using a growable buffer. + * + * The data is placed in the given data pointer if and when the writer + * is destroyed without error. The data pointer is NULL during writing, + * and will remain NULL if an error occurs. + * + * The allocated data must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_memory if the buffer fails to grow when + * flushing. + * + * @param writer The MPack writer. + * @param data Where to place the allocated data. + * @param size Where to write the size of the data. + */ +void mpack_writer_init_growable(mpack_writer_t* writer, char** data, size_t* size); +#endif + +/** + * Initializes an MPack writer directly into an error state. Use this if you + * are writing a wrapper to mpack_writer_init() which can fail its setup. + */ +void mpack_writer_init_error(mpack_writer_t* writer, mpack_error_t error); + +#if MPACK_STDIO +/** + * Initializes an MPack writer that writes to a file. + * + * @throws mpack_error_memory if allocation fails + * @throws mpack_error_io if the file cannot be opened + */ +void mpack_writer_init_filename(mpack_writer_t* writer, const char* filename); + +/** + * Deprecated. + * + * \deprecated Renamed to mpack_writer_init_filename(). + */ +MPACK_INLINE void mpack_writer_init_file(mpack_writer_t* writer, const char* filename) { + mpack_writer_init_filename(writer, filename); +} + +/** + * Initializes an MPack writer that writes to a libc FILE. This can be used to + * write to stdout or stderr, or to a file opened separately. + * + * @param writer The MPack writer. + * @param stdfile The FILE. + * @param close_when_done If true, fclose() will be called on the FILE when it + * is no longer needed. If false, the file will not be flushed or + * closed when writing is done. + * + * @note The writer is buffered. If you want to write other data to the FILE in + * between messages, you must flush it first. + * + * @see mpack_writer_flush_message + */ +void mpack_writer_init_stdfile(mpack_writer_t* writer, FILE* stdfile, bool close_when_done); +#endif + +/** @cond */ + +#define mpack_writer_init_stack_line_ex(line, writer) \ + char mpack_buf_##line[MPACK_STACK_SIZE]; \ + mpack_writer_init(writer, mpack_buf_##line, sizeof(mpack_buf_##line)) + +#define mpack_writer_init_stack_line(line, writer) \ + mpack_writer_init_stack_line_ex(line, writer) + +/* + * Initializes an MPack writer using stack space as a buffer. A flush function + * should be added to the writer to flush the buffer. + * + * This is currently undocumented since it's not entirely useful on its own. + */ + +#define mpack_writer_init_stack(writer) \ + mpack_writer_init_stack_line(__LINE__, (writer)) + +/** @endcond */ + +/** + * Cleans up the MPack writer, flushing and closing the underlying stream, + * if any. Returns the final error state of the writer. + * + * No flushing is performed if the writer is in an error state. The attached + * teardown function is called whether or not the writer is in an error state. + * + * This will assert in tracking mode if the writer is not in an error + * state and has any unclosed compound types. If you want to cancel + * writing in the middle of a document, you need to flag an error on + * the writer before destroying it (such as mpack_error_data). + * + * Note that a writer may raise an error and call your error handler during + * the final flush. It is safe to longjmp or throw out of this error handler, + * but if you do, the writer will not be destroyed, and the teardown function + * will not be called. You can still get the writer's error state, and you + * must call @ref mpack_writer_destroy() again. (The second call is guaranteed + * not to call your error handler again since the writer is already in an error + * state.) + * + * @see mpack_writer_set_error_handler + * @see mpack_writer_set_flush + * @see mpack_writer_set_teardown + * @see mpack_writer_flag_error + * @see mpack_error_data + */ +mpack_error_t mpack_writer_destroy(mpack_writer_t* writer); + +/** + * @} + */ + +/** + * @name Configuration + * @{ + */ + +#if MPACK_COMPATIBILITY +/** + * Sets the version of the MessagePack spec that will be generated. + * + * This can be used to interface with older libraries that do not support + * the newest MessagePack features (such as the @c str8 type.) + * + * @note This requires @ref MPACK_COMPATIBILITY. + */ +MPACK_INLINE void mpack_writer_set_version(mpack_writer_t* writer, mpack_version_t version) { + writer->version = version; +} +#endif + +/** + * Sets the custom pointer to pass to the writer callbacks, such as flush + * or teardown. + * + * @param writer The MPack writer. + * @param context User data to pass to the writer callbacks. + * + * @see mpack_writer_context() + */ +MPACK_INLINE void mpack_writer_set_context(mpack_writer_t* writer, void* context) { + writer->context = context; +} + +/** + * Returns the custom context for writer callbacks. + * + * @see mpack_writer_set_context + * @see mpack_writer_set_flush + */ +MPACK_INLINE void* mpack_writer_context(mpack_writer_t* writer) { + return writer->context; +} + +/** + * Sets the flush function to write out the data when the buffer is full. + * + * If no flush function is used, trying to write past the end of the + * buffer will result in mpack_error_too_big. + * + * This should normally be used with mpack_writer_set_context() to register + * a custom pointer to pass to the flush function. + * + * @param writer The MPack writer. + * @param flush The function to write out data from the buffer. + * + * @see mpack_writer_context() + */ +void mpack_writer_set_flush(mpack_writer_t* writer, mpack_writer_flush_t flush); + +/** + * Sets the error function to call when an error is flagged on the writer. + * + * This should normally be used with mpack_writer_set_context() to register + * a custom pointer to pass to the error function. + * + * See the definition of mpack_writer_error_t for more information about + * what you can do from an error callback. + * + * @see mpack_writer_error_t + * @param writer The MPack writer. + * @param error_fn The function to call when an error is flagged on the writer. + */ +MPACK_INLINE void mpack_writer_set_error_handler(mpack_writer_t* writer, mpack_writer_error_t error_fn) { + writer->error_fn = error_fn; +} + +/** + * Sets the teardown function to call when the writer is destroyed. + * + * This should normally be used with mpack_writer_set_context() to register + * a custom pointer to pass to the teardown function. + * + * @param writer The MPack writer. + * @param teardown The function to call when the writer is destroyed. + */ +MPACK_INLINE void mpack_writer_set_teardown(mpack_writer_t* writer, mpack_writer_teardown_t teardown) { + writer->teardown = teardown; +} + +/** + * @} + */ + +/** + * @name Core Writer Functions + * @{ + */ + +/** + * Flushes any buffered data to the underlying stream. + * + * If write tracking is enabled, this will break and flag @ref + * mpack_error_bug if the writer has any open compound types, ensuring + * that no compound types are still open. This prevents a "missing + * finish" bug from causing a never-ending message. + * + * If the writer is connected to a socket and you are keeping it open, + * you will want to call this after writing a message (or set of + * messages) so that the data is actually sent. + * + * It is not necessary to call this if you are not keeping the writer + * open afterwards. You can just call `mpack_writer_destroy()`, and it + * will flush before cleaning up. + * + * This will assert if no flush function is assigned to the writer. + */ +void mpack_writer_flush_message(mpack_writer_t* writer); + +/** + * Returns the number of bytes currently stored in the buffer. This + * may be less than the total number of bytes written if bytes have + * been flushed to an underlying stream. + */ +MPACK_INLINE size_t mpack_writer_buffer_used(mpack_writer_t* writer) { + return (size_t)(writer->current - writer->buffer); +} + +/** + * Returns the amount of space left in the buffer. This may be reset + * after a write if bytes are flushed to an underlying stream. + */ +MPACK_INLINE size_t mpack_writer_buffer_left(mpack_writer_t* writer) { + return (size_t)(writer->end - writer->current); +} + +/** + * Returns the (current) size of the buffer. This may change after a write if + * the flush callback changes the buffer. + */ +MPACK_INLINE size_t mpack_writer_buffer_size(mpack_writer_t* writer) { + return (size_t)(writer->end - writer->buffer); +} + +/** + * Places the writer in the given error state, calling the error callback if one + * is set. + * + * This allows you to externally flag errors, for example if you are validating + * data as you write it, or if you want to cancel writing in the middle of a + * document. (The writer will assert if you try to destroy it without error and + * with unclosed compound types. In this case you should flag mpack_error_data + * before destroying it.) + * + * If the writer is already in an error state, this call is ignored and no + * error callback is called. + * + * @see mpack_writer_destroy + * @see mpack_error_data + */ +void mpack_writer_flag_error(mpack_writer_t* writer, mpack_error_t error); + +/** + * Queries the error state of the MPack writer. + * + * If a writer is in an error state, you should discard all data since the + * last time the error flag was checked. The error flag cannot be cleared. + */ +MPACK_INLINE mpack_error_t mpack_writer_error(mpack_writer_t* writer) { + return writer->error; +} + +/** + * Writes a MessagePack object header (an MPack Tag.) + * + * If the value is a map, array, string, binary or extension type, the + * containing elements or bytes must be written separately and the + * appropriate finish function must be called (as though one of the + * mpack_start_*() functions was called.) + * + * @see mpack_write_bytes() + * @see mpack_finish_map() + * @see mpack_finish_array() + * @see mpack_finish_str() + * @see mpack_finish_bin() + * @see mpack_finish_ext() + * @see mpack_finish_type() + */ +void mpack_write_tag(mpack_writer_t* writer, mpack_tag_t tag); + +/** + * @} + */ + +/** + * @name Integers + * @{ + */ + +/** Writes an 8-bit integer in the most efficient packing available. */ +void mpack_write_i8(mpack_writer_t* writer, int8_t value); + +/** Writes a 16-bit integer in the most efficient packing available. */ +void mpack_write_i16(mpack_writer_t* writer, int16_t value); + +/** Writes a 32-bit integer in the most efficient packing available. */ +void mpack_write_i32(mpack_writer_t* writer, int32_t value); + +/** Writes a 64-bit integer in the most efficient packing available. */ +void mpack_write_i64(mpack_writer_t* writer, int64_t value); + +/** Writes an integer in the most efficient packing available. */ +MPACK_INLINE void mpack_write_int(mpack_writer_t* writer, int64_t value) { + mpack_write_i64(writer, value); +} + +/** Writes an 8-bit unsigned integer in the most efficient packing available. */ +void mpack_write_u8(mpack_writer_t* writer, uint8_t value); + +/** Writes an 16-bit unsigned integer in the most efficient packing available. */ +void mpack_write_u16(mpack_writer_t* writer, uint16_t value); + +/** Writes an 32-bit unsigned integer in the most efficient packing available. */ +void mpack_write_u32(mpack_writer_t* writer, uint32_t value); + +/** Writes an 64-bit unsigned integer in the most efficient packing available. */ +void mpack_write_u64(mpack_writer_t* writer, uint64_t value); + +/** Writes an unsigned integer in the most efficient packing available. */ +MPACK_INLINE void mpack_write_uint(mpack_writer_t* writer, uint64_t value) { + mpack_write_u64(writer, value); +} + +/** + * @} + */ + +/** + * @name Other Basic Types + * @{ + */ + +/** Writes a float. */ +void mpack_write_float(mpack_writer_t* writer, float value); + +/** Writes a double. */ +void mpack_write_double(mpack_writer_t* writer, double value); + +/** Writes a boolean. */ +void mpack_write_bool(mpack_writer_t* writer, bool value); + +/** Writes a boolean with value true. */ +void mpack_write_true(mpack_writer_t* writer); + +/** Writes a boolean with value false. */ +void mpack_write_false(mpack_writer_t* writer); + +/** Writes a nil. */ +void mpack_write_nil(mpack_writer_t* writer); + +/** Write a pre-encoded messagepack object */ +void mpack_write_object_bytes(mpack_writer_t* writer, const char* data, size_t bytes); + +#if MPACK_EXTENSIONS +/** + * Writes a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @param writer The writer + * @param seconds The (signed) number of seconds since 1970-01-01T00:00:00Z. + * @param nanoseconds The additional number of nanoseconds from 0 to 999,999,999 inclusive. + */ +void mpack_write_timestamp(mpack_writer_t* writer, int64_t seconds, uint32_t nanoseconds); + +/** + * Writes a timestamp with the given number of seconds (and zero nanoseconds). + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @param writer The writer + * @param seconds The (signed) number of seconds since 1970-01-01T00:00:00Z. + */ +MPACK_INLINE void mpack_write_timestamp_seconds(mpack_writer_t* writer, int64_t seconds) { + mpack_write_timestamp(writer, seconds, 0); +} + +/** + * Writes a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +MPACK_INLINE void mpack_write_timestamp_struct(mpack_writer_t* writer, mpack_timestamp_t timestamp) { + mpack_write_timestamp(writer, timestamp.seconds, timestamp.nanoseconds); +} +#endif + +/** + * @} + */ + +/** + * @name Map and Array Functions + * @{ + */ + +/** + * Opens an array. + * + * `count` elements must follow, and mpack_finish_array() must be called + * when done. + * + * @see mpack_finish_array() + */ +void mpack_start_array(mpack_writer_t* writer, uint32_t count); + +/** + * Opens a map. + * + * `count * 2` elements must follow, and mpack_finish_map() must be called + * when done. + * + * Remember that while map elements in MessagePack are implicitly ordered, + * they are not ordered in JSON. If you need elements to be read back + * in the order they are written, consider use an array instead. + * + * @see mpack_finish_map() + */ +void mpack_start_map(mpack_writer_t* writer, uint32_t count); + +/** + * Finishes writing an array. + * + * This should be called only after a corresponding call to mpack_start_array() + * and after the array contents are written. + * + * This will track writes to ensure that the correct number of elements are written. + * + * @see mpack_start_array() + */ +MPACK_INLINE void mpack_finish_array(mpack_writer_t* writer) { + mpack_writer_track_pop(writer, mpack_type_array); +} + +/** + * Finishes writing a map. + * + * This should be called only after a corresponding call to mpack_start_map() + * and after the map contents are written. + * + * This will track writes to ensure that the correct number of elements are written. + * + * @see mpack_start_map() + */ +MPACK_INLINE void mpack_finish_map(mpack_writer_t* writer) { + mpack_writer_track_pop(writer, mpack_type_map); +} + +/** + * @} + */ + +/** + * @name Data Helpers + * @{ + */ + +/** + * Writes a string. + * + * To stream a string in chunks, use mpack_start_str() instead. + * + * MPack does not care about the underlying encoding, but UTF-8 is highly + * recommended, especially for compatibility with JSON. You should consider + * calling mpack_write_utf8() instead, especially if you will be reading + * it back as UTF-8. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + */ +void mpack_write_str(mpack_writer_t* writer, const char* str, uint32_t length); + +/** + * Writes a string, ensuring that it is valid UTF-8. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + * + * @throws mpack_error_invalid if the string is not valid UTF-8 + */ +void mpack_write_utf8(mpack_writer_t* writer, const char* str, uint32_t length); + +/** + * Writes a null-terminated string. (The null-terminator is not written.) + * + * MPack does not care about the underlying encoding, but UTF-8 is highly + * recommended, especially for compatibility with JSON. You should consider + * calling mpack_write_utf8_cstr() instead, especially if you will be reading + * it back as UTF-8. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + */ +void mpack_write_cstr(mpack_writer_t* writer, const char* cstr); + +/** + * Writes a null-terminated string, or a nil node if the given cstr pointer + * is NULL. (The null-terminator is not written.) + * + * MPack does not care about the underlying encoding, but UTF-8 is highly + * recommended, especially for compatibility with JSON. You should consider + * calling mpack_write_utf8_cstr_or_nil() instead, especially if you will + * be reading it back as UTF-8. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + */ +void mpack_write_cstr_or_nil(mpack_writer_t* writer, const char* cstr); + +/** + * Writes a null-terminated string, ensuring that it is valid UTF-8. (The + * null-terminator is not written.) + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + * + * @throws mpack_error_invalid if the string is not valid UTF-8 + */ +void mpack_write_utf8_cstr(mpack_writer_t* writer, const char* cstr); + +/** + * Writes a null-terminated string ensuring that it is valid UTF-8, or + * writes nil if the given cstr pointer is NULL. (The null-terminator + * is not written.) + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * You should not call mpack_finish_str() after calling this; this + * performs both start and finish. + * + * @throws mpack_error_invalid if the string is not valid UTF-8 + */ +void mpack_write_utf8_cstr_or_nil(mpack_writer_t* writer, const char* cstr); + +/** + * Writes a binary blob. + * + * To stream a binary blob in chunks, use mpack_start_bin() instead. + * + * You should not call mpack_finish_bin() after calling this; this + * performs both start and finish. + */ +void mpack_write_bin(mpack_writer_t* writer, const char* data, uint32_t count); + +#if MPACK_EXTENSIONS +/** + * Writes an extension type. + * + * To stream an extension blob in chunks, use mpack_start_ext() instead. + * + * Extension types [0, 127] are available for application-specific types. Extension + * types [-128, -1] are reserved for future extensions of MessagePack. + * + * You should not call mpack_finish_ext() after calling this; this + * performs both start and finish. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +void mpack_write_ext(mpack_writer_t* writer, int8_t exttype, const char* data, uint32_t count); +#endif + +/** + * @} + */ + +/** + * @name Chunked Data Functions + * @{ + */ + +/** + * Opens a string. `count` bytes should be written with calls to + * mpack_write_bytes(), and mpack_finish_str() should be called + * when done. + * + * To write an entire string at once, use mpack_write_str() or + * mpack_write_cstr() instead. + * + * MPack does not care about the underlying encoding, but UTF-8 is highly + * recommended, especially for compatibility with JSON. + */ +void mpack_start_str(mpack_writer_t* writer, uint32_t count); + +/** + * Opens a binary blob. `count` bytes should be written with calls to + * mpack_write_bytes(), and mpack_finish_bin() should be called + * when done. + */ +void mpack_start_bin(mpack_writer_t* writer, uint32_t count); + +#if MPACK_EXTENSIONS +/** + * Opens an extension type. `count` bytes should be written with calls + * to mpack_write_bytes(), and mpack_finish_ext() should be called + * when done. + * + * Extension types [0, 127] are available for application-specific types. Extension + * types [-128, -1] are reserved for future extensions of MessagePack. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +void mpack_start_ext(mpack_writer_t* writer, int8_t exttype, uint32_t count); +#endif + +/** + * Writes a portion of bytes for a string, binary blob or extension type which + * was opened by mpack_write_tag() or one of the mpack_start_*() functions. + * + * This can be called multiple times to write the data in chunks, as long as + * the total amount of bytes written matches the count given when the compound + * type was started. + * + * The corresponding mpack_finish_*() function must be called when done. + * + * To write an entire string, binary blob or extension type at + * once, use one of the mpack_write_*() functions instead. + * + * @see mpack_write_tag() + * @see mpack_start_str() + * @see mpack_start_bin() + * @see mpack_start_ext() + * @see mpack_finish_str() + * @see mpack_finish_bin() + * @see mpack_finish_ext() + * @see mpack_finish_type() + */ +void mpack_write_bytes(mpack_writer_t* writer, const char* data, size_t count); + +/** + * Finishes writing a string. + * + * This should be called only after a corresponding call to mpack_start_str() + * and after the string bytes are written with mpack_write_bytes(). + * + * This will track writes to ensure that the correct number of elements are written. + * + * @see mpack_start_str() + * @see mpack_write_bytes() + */ +MPACK_INLINE void mpack_finish_str(mpack_writer_t* writer) { + mpack_writer_track_pop(writer, mpack_type_str); +} + +/** + * Finishes writing a binary blob. + * + * This should be called only after a corresponding call to mpack_start_bin() + * and after the binary bytes are written with mpack_write_bytes(). + * + * This will track writes to ensure that the correct number of bytes are written. + * + * @see mpack_start_bin() + * @see mpack_write_bytes() + */ +MPACK_INLINE void mpack_finish_bin(mpack_writer_t* writer) { + mpack_writer_track_pop(writer, mpack_type_bin); +} + +#if MPACK_EXTENSIONS +/** + * Finishes writing an extended type binary data blob. + * + * This should be called only after a corresponding call to mpack_start_bin() + * and after the binary bytes are written with mpack_write_bytes(). + * + * This will track writes to ensure that the correct number of bytes are written. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @see mpack_start_ext() + * @see mpack_write_bytes() + */ +MPACK_INLINE void mpack_finish_ext(mpack_writer_t* writer) { + mpack_writer_track_pop(writer, mpack_type_ext); +} +#endif + +/** + * Finishes writing the given compound type. + * + * This will track writes to ensure that the correct number of elements + * or bytes are written. + * + * This can be called with the appropriate type instead the corresponding + * mpack_finish_*() function if you want to finish a dynamic type. + */ +MPACK_INLINE void mpack_finish_type(mpack_writer_t* writer, mpack_type_t type) { + mpack_writer_track_pop(writer, type); +} + +/** + * @} + */ + +#if MPACK_WRITER && MPACK_HAS_GENERIC && !defined(__cplusplus) + +/** + * @name Type-Generic Writers + * @{ + */ + +/** + * @def mpack_write(writer, value) + * + * Type-generic writer for primitive types. + * + * The compiler will dispatch to an appropriate write function based + * on the type of the @a value parameter. + * + * @note This requires C11 `_Generic` support. (A set of inline overloads + * are used in C++ to provide the same functionality.) + * + * @warning In C11, the indentifiers `true`, `false` and `NULL` are + * all of type `int`, not `bool` or `void*`! They will emit unexpected + * types when passed uncast, so be careful when using them. + */ +#define mpack_write(writer, value) \ + _Generic(((void)0, value), \ + int8_t: mpack_write_i8, \ + int16_t: mpack_write_i16, \ + int32_t: mpack_write_i32, \ + int64_t: mpack_write_i64, \ + uint8_t: mpack_write_u8, \ + uint16_t: mpack_write_u16, \ + uint32_t: mpack_write_u32, \ + uint64_t: mpack_write_u64, \ + bool: mpack_write_bool, \ + float: mpack_write_float, \ + double: mpack_write_double, \ + char *: mpack_write_cstr_or_nil, \ + const char *: mpack_write_cstr_or_nil \ + )(writer, value) + +/** + * @def mpack_write_kv(writer, key, value) + * + * Type-generic writer for key-value pairs of null-terminated string + * keys and primitive values. + * + * @warning @a writer may be evaluated multiple times. + * + * @warning In C11, the indentifiers `true`, `false` and `NULL` are + * all of type `int`, not `bool` or `void*`! They will emit unexpected + * types when passed uncast, so be careful when using them. + * + * @param writer The writer. + * @param key A null-terminated C string. + * @param value A primitive type supported by mpack_write(). + */ +#define mpack_write_kv(writer, key, value) do { \ + mpack_write_cstr(writer, key); \ + mpack_write(writer, value); \ +} while (0) + +/** + * @} + */ + +#endif + +/** + * @} + */ + +#endif + +MPACK_HEADER_END + +#if defined(__cplusplus) || defined(MPACK_DOXYGEN) + +/* + * C++ generic writers for primitive values + * + * These currently sit outside of MPACK_HEADER_END because it defines + * extern "C". They'll be moved to a C++-specific header soon. + */ + +#ifdef MPACK_DOXYGEN +#undef mpack_write +#undef mpack_write_kv +#endif + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, int8_t value) { + mpack_write_i8(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, int16_t value) { + mpack_write_i16(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, int32_t value) { + mpack_write_i32(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, int64_t value) { + mpack_write_i64(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, uint8_t value) { + mpack_write_u8(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, uint16_t value) { + mpack_write_u16(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, uint32_t value) { + mpack_write_u32(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, uint64_t value) { + mpack_write_u64(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, bool value) { + mpack_write_bool(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, float value) { + mpack_write_float(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, double value) { + mpack_write_double(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, char *value) { + mpack_write_cstr_or_nil(writer, value); +} + +MPACK_INLINE void mpack_write(mpack_writer_t* writer, const char *value) { + mpack_write_cstr_or_nil(writer, value); +} + +/* C++ generic write for key-value pairs */ + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, int8_t value) { + mpack_write_cstr(writer, key); + mpack_write_i8(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, int16_t value) { + mpack_write_cstr(writer, key); + mpack_write_i16(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, int32_t value) { + mpack_write_cstr(writer, key); + mpack_write_i32(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, int64_t value) { + mpack_write_cstr(writer, key); + mpack_write_i64(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, uint8_t value) { + mpack_write_cstr(writer, key); + mpack_write_u8(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, uint16_t value) { + mpack_write_cstr(writer, key); + mpack_write_u16(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, uint32_t value) { + mpack_write_cstr(writer, key); + mpack_write_u32(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, uint64_t value) { + mpack_write_cstr(writer, key); + mpack_write_u64(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, bool value) { + mpack_write_cstr(writer, key); + mpack_write_bool(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, float value) { + mpack_write_cstr(writer, key); + mpack_write_float(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, double value) { + mpack_write_cstr(writer, key); + mpack_write_double(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, char *value) { + mpack_write_cstr(writer, key); + mpack_write_cstr_or_nil(writer, value); +} + +MPACK_INLINE void mpack_write_kv(mpack_writer_t* writer, const char *key, const char *value) { + mpack_write_cstr(writer, key); + mpack_write_cstr_or_nil(writer, value); +} +#endif /* __cplusplus */ + +#endif + +/* mpack/mpack-reader.h.h */ + +/** + * @file + * + * Declares the core MPack Tag Reader. + */ + +#ifndef MPACK_READER_H +#define MPACK_READER_H 1 + +/* #include "mpack-common.h" */ + +MPACK_HEADER_START + +#if MPACK_READER + +#if MPACK_READ_TRACKING +struct mpack_track_t; +#endif + +// The denominator to determine whether a read is a small +// fraction of the buffer size. +#define MPACK_READER_SMALL_FRACTION_DENOMINATOR 32 + +/** + * @defgroup reader Reader API + * + * The MPack Reader API contains functions for imperatively reading dynamically + * typed data from a MessagePack stream. + * + * See @ref docs/reader.md for examples. + * + * @note If you are not writing code for an embedded device (or otherwise do + * not need maximum performance with minimal memory usage), you should not use + * this. You probably want to use the @link node Node API@endlink instead. + * + * This forms the basis of the @link expect Expect API@endlink, which can be + * used to interpret the stream of elements in expected types and value ranges. + * + * @{ + */ + +/** + * @def MPACK_READER_MINIMUM_BUFFER_SIZE + * + * The minimum buffer size for a reader with a fill function. + */ +#define MPACK_READER_MINIMUM_BUFFER_SIZE 32 + +/** + * A buffered MessagePack decoder. + * + * The decoder wraps an existing buffer and, optionally, a fill function. + * This allows efficiently decoding data from existing memory buffers, files, + * streams, etc. + * + * All read operations are synchronous; they will block until the + * requested data is fully read, or an error occurs. + * + * This structure is opaque; its fields should not be accessed outside + * of MPack. + */ +typedef struct mpack_reader_t mpack_reader_t; + +/** + * The MPack reader's fill function. It should fill the buffer with at + * least one byte and at most the given @c count, returning the number + * of bytes written to the buffer. + * + * In case of error, it should flag an appropriate error on the reader + * (usually @ref mpack_error_io), or simply return zero. If zero is + * returned, mpack_error_io is raised. + * + * @note When reading from a stream, you should only copy and return + * the bytes that are immediately available. It is always safe to return + * less than the requested count as long as some non-zero number of bytes + * are read; if more bytes are needed, the read function will simply be + * called again. + * + * @see mpack_reader_context() + */ +typedef size_t (*mpack_reader_fill_t)(mpack_reader_t* reader, char* buffer, size_t count); + +/** + * The MPack reader's skip function. It should discard the given number + * of bytes from the source (for example by seeking forward.) + * + * In case of error, it should flag an appropriate error on the reader. + * + * @see mpack_reader_context() + */ +typedef void (*mpack_reader_skip_t)(mpack_reader_t* reader, size_t count); + +/** + * An error handler function to be called when an error is flagged on + * the reader. + * + * The error handler will only be called once on the first error flagged; + * any subsequent reads and errors are ignored, and the reader is + * permanently in that error state. + * + * MPack is safe against non-local jumps out of error handler callbacks. + * This means you are allowed to longjmp or throw an exception (in C++, + * Objective-C, or with SEH) out of this callback. + * + * Bear in mind when using longjmp that local non-volatile variables that + * have changed are undefined when setjmp() returns, so you can't put the + * reader on the stack in the same activation frame as the setjmp without + * declaring it volatile. + * + * You must still eventually destroy the reader. It is not destroyed + * automatically when an error is flagged. It is safe to destroy the + * reader within this error callback, but you will either need to perform + * a non-local jump, or store something in your context to identify + * that the reader is destroyed since any future accesses to it cause + * undefined behavior. + */ +typedef void (*mpack_reader_error_t)(mpack_reader_t* reader, mpack_error_t error); + +/** + * A teardown function to be called when the reader is destroyed. + */ +typedef void (*mpack_reader_teardown_t)(mpack_reader_t* reader); + +/* Hide internals from documentation */ +/** @cond */ + +struct mpack_reader_t { + void* context; /* Context for reader callbacks */ + mpack_reader_fill_t fill; /* Function to read bytes into the buffer */ + mpack_reader_error_t error_fn; /* Function to call on error */ + mpack_reader_teardown_t teardown; /* Function to teardown the context on destroy */ + mpack_reader_skip_t skip; /* Function to skip bytes from the source */ + + char* buffer; /* Writeable byte buffer */ + size_t size; /* Size of the buffer */ + + const char* data; /* Current data pointer (in the buffer, if it is used) */ + const char* end; /* The end of available data (in the buffer, if it is used) */ + + mpack_error_t error; /* Error state */ + + #if MPACK_READ_TRACKING + mpack_track_t track; /* Stack of map/array/str/bin/ext reads */ + #endif +}; + +/** @endcond */ + +/** + * @name Lifecycle Functions + * @{ + */ + +/** + * Initializes an MPack reader with the given buffer. The reader does + * not assume ownership of the buffer, but the buffer must be writeable + * if a fill function will be used to refill it. + * + * @param reader The MPack reader. + * @param buffer The buffer with which to read MessagePack data. + * @param size The size of the buffer. + * @param count The number of bytes already in the buffer. + */ +void mpack_reader_init(mpack_reader_t* reader, char* buffer, size_t size, size_t count); + +/** + * Initializes an MPack reader directly into an error state. Use this if you + * are writing a wrapper to mpack_reader_init() which can fail its setup. + */ +void mpack_reader_init_error(mpack_reader_t* reader, mpack_error_t error); + +/** + * Initializes an MPack reader to parse a pre-loaded contiguous chunk of data. The + * reader does not assume ownership of the data. + * + * @param reader The MPack reader. + * @param data The data to parse. + * @param count The number of bytes pointed to by data. + */ +void mpack_reader_init_data(mpack_reader_t* reader, const char* data, size_t count); + +#if MPACK_STDIO +/** + * Initializes an MPack reader that reads from a file. + * + * The file will be automatically opened and closed by the reader. + */ +void mpack_reader_init_filename(mpack_reader_t* reader, const char* filename); + +/** + * Deprecated. + * + * \deprecated Renamed to mpack_reader_init_filename(). + */ +MPACK_INLINE void mpack_reader_init_file(mpack_reader_t* reader, const char* filename) { + mpack_reader_init_filename(reader, filename); +} + +/** + * Initializes an MPack reader that reads from a libc FILE. This can be used to + * read from stdin, or from a file opened separately. + * + * @param reader The MPack reader. + * @param stdfile The FILE. + * @param close_when_done If true, fclose() will be called on the FILE when it + * is no longer needed. If false, the file will not be closed when + * reading is done. + * + * @warning The reader is buffered. It will read data in advance of parsing it, + * and it may read more data than it parsed. See mpack_reader_remaining() to + * access the extra data. + */ +void mpack_reader_init_stdfile(mpack_reader_t* reader, FILE* stdfile, bool close_when_done); +#endif + +/** + * @def mpack_reader_init_stack(reader) + * @hideinitializer + * + * Initializes an MPack reader using stack space as a buffer. A fill function + * should be added to the reader to fill the buffer. + * + * @see mpack_reader_set_fill + */ + +/** @cond */ +#define mpack_reader_init_stack_line_ex(line, reader) \ + char mpack_buf_##line[MPACK_STACK_SIZE]; \ + mpack_reader_init((reader), mpack_buf_##line, sizeof(mpack_buf_##line), 0) + +#define mpack_reader_init_stack_line(line, reader) \ + mpack_reader_init_stack_line_ex(line, reader) +/** @endcond */ + +#define mpack_reader_init_stack(reader) \ + mpack_reader_init_stack_line(__LINE__, (reader)) + +/** + * Cleans up the MPack reader, ensuring that all compound elements + * have been completely read. Returns the final error state of the + * reader. + * + * This will assert in tracking mode if the reader is not in an error + * state and has any incomplete reads. If you want to cancel reading + * in the middle of a document, you need to flag an error on the reader + * before destroying it (such as mpack_error_data). + * + * @see mpack_read_tag() + * @see mpack_reader_flag_error() + * @see mpack_error_data + */ +mpack_error_t mpack_reader_destroy(mpack_reader_t* reader); + +/** + * @} + */ + +/** + * @name Callbacks + * @{ + */ + +/** + * Sets the custom pointer to pass to the reader callbacks, such as fill + * or teardown. + * + * @param reader The MPack reader. + * @param context User data to pass to the reader callbacks. + * + * @see mpack_reader_context() + */ +MPACK_INLINE void mpack_reader_set_context(mpack_reader_t* reader, void* context) { + reader->context = context; +} + +/** + * Returns the custom context for reader callbacks. + * + * @see mpack_reader_set_context + * @see mpack_reader_set_fill + * @see mpack_reader_set_skip + */ +MPACK_INLINE void* mpack_reader_context(mpack_reader_t* reader) { + return reader->context; +} + +/** + * Sets the fill function to refill the data buffer when it runs out of data. + * + * If no fill function is used, truncated MessagePack data results in + * mpack_error_invalid (since the buffer is assumed to contain a + * complete MessagePack object.) + * + * If a fill function is used, truncated MessagePack data usually + * results in mpack_error_io (since the fill function fails to get + * the missing data.) + * + * This should normally be used with mpack_reader_set_context() to register + * a custom pointer to pass to the fill function. + * + * @param reader The MPack reader. + * @param fill The function to fetch additional data into the buffer. + */ +void mpack_reader_set_fill(mpack_reader_t* reader, mpack_reader_fill_t fill); + +/** + * Sets the skip function to discard bytes from the source stream. + * + * It's not necessary to implement this function. If the stream is not + * seekable, don't set a skip callback. The reader will fall back to + * using the fill function instead. + * + * This should normally be used with mpack_reader_set_context() to register + * a custom pointer to pass to the skip function. + * + * The skip function is ignored in size-optimized builds to reduce code + * size. Data will be skipped with the fill function when necessary. + * + * @param reader The MPack reader. + * @param skip The function to discard bytes from the source stream. + */ +void mpack_reader_set_skip(mpack_reader_t* reader, mpack_reader_skip_t skip); + +/** + * Sets the error function to call when an error is flagged on the reader. + * + * This should normally be used with mpack_reader_set_context() to register + * a custom pointer to pass to the error function. + * + * See the definition of mpack_reader_error_t for more information about + * what you can do from an error callback. + * + * @see mpack_reader_error_t + * @param reader The MPack reader. + * @param error_fn The function to call when an error is flagged on the reader. + */ +MPACK_INLINE void mpack_reader_set_error_handler(mpack_reader_t* reader, mpack_reader_error_t error_fn) { + reader->error_fn = error_fn; +} + +/** + * Sets the teardown function to call when the reader is destroyed. + * + * This should normally be used with mpack_reader_set_context() to register + * a custom pointer to pass to the teardown function. + * + * @param reader The MPack reader. + * @param teardown The function to call when the reader is destroyed. + */ +MPACK_INLINE void mpack_reader_set_teardown(mpack_reader_t* reader, mpack_reader_teardown_t teardown) { + reader->teardown = teardown; +} + +/** + * @} + */ + +/** + * @name Core Reader Functions + * @{ + */ + +/** + * Queries the error state of the MPack reader. + * + * If a reader is in an error state, you should discard all data since the + * last time the error flag was checked. The error flag cannot be cleared. + */ +MPACK_INLINE mpack_error_t mpack_reader_error(mpack_reader_t* reader) { + return reader->error; +} + +/** + * Places the reader in the given error state, calling the error callback if one + * is set. + * + * This allows you to externally flag errors, for example if you are validating + * data as you read it. + * + * If the reader is already in an error state, this call is ignored and no + * error callback is called. + */ +void mpack_reader_flag_error(mpack_reader_t* reader, mpack_error_t error); + +/** + * Places the reader in the given error state if the given error is not mpack_ok, + * returning the resulting error state of the reader. + * + * This allows you to externally flag errors, for example if you are validating + * data as you read it. + * + * If the given error is mpack_ok or if the reader is already in an error state, + * this call is ignored and the actual error state of the reader is returned. + */ +MPACK_INLINE mpack_error_t mpack_reader_flag_if_error(mpack_reader_t* reader, mpack_error_t error) { + if (error != mpack_ok) + mpack_reader_flag_error(reader, error); + return mpack_reader_error(reader); +} + +/** + * Returns bytes left in the reader's buffer. + * + * If you are done reading MessagePack data but there is other interesting data + * following it, the reader may have buffered too much data. The number of bytes + * remaining in the buffer and a pointer to the position of those bytes can be + * queried here. + * + * If you know the length of the MPack chunk beforehand, it's better to instead + * have your fill function limit the data it reads so that the reader does not + * have extra data. In this case you can simply check that this returns zero. + * + * Returns 0 if the reader is in an error state. + * + * @param reader The MPack reader from which to query remaining data. + * @param data [out] A pointer to the remaining data, or NULL. + * @return The number of bytes remaining in the buffer. + */ +size_t mpack_reader_remaining(mpack_reader_t* reader, const char** data); + +/** + * Reads a MessagePack object header (an MPack tag.) + * + * If an error occurs, the reader is placed in an error state and a + * nil tag is returned. If the reader is already in an error state, + * a nil tag is returned. + * + * If the type is compound (i.e. is a map, array, string, binary or + * extension type), additional reads are required to get the contained + * data, and the corresponding done function must be called when done. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * @see mpack_read_bytes() + * @see mpack_done_array() + * @see mpack_done_map() + * @see mpack_done_str() + * @see mpack_done_bin() + * @see mpack_done_ext() + */ +mpack_tag_t mpack_read_tag(mpack_reader_t* reader); + +/** + * Parses the next MessagePack object header (an MPack tag) without + * advancing the reader. + * + * If an error occurs, the reader is placed in an error state and a + * nil tag is returned. If the reader is already in an error state, + * a nil tag is returned. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * @see mpack_read_tag() + * @see mpack_discard() + */ +mpack_tag_t mpack_peek_tag(mpack_reader_t* reader); + +/** + * @} + */ + +/** + * @name String and Data Functions + * @{ + */ + +/** + * Skips bytes from the underlying stream. This is used only to + * skip the contents of a string, binary blob or extension object. + */ +void mpack_skip_bytes(mpack_reader_t* reader, size_t count); + +/** + * Reads bytes from a string, binary blob or extension object, copying + * them into the given buffer. + * + * A str, bin or ext must have been opened by a call to mpack_read_tag() + * which yielded one of these types, or by a call to an expect function + * such as mpack_expect_str() or mpack_expect_bin(). + * + * If an error occurs, the buffer contents are undefined. + * + * This can be called multiple times for a single str, bin or ext + * to read the data in chunks. The total data read must add up + * to the size of the object. + * + * @param reader The MPack reader + * @param p The buffer in which to copy the bytes + * @param count The number of bytes to read + */ +void mpack_read_bytes(mpack_reader_t* reader, char* p, size_t count); + +/** + * Reads bytes from a string, ensures that the string is valid UTF-8, + * and copies the bytes into the given buffer. + * + * A string must have been opened by a call to mpack_read_tag() which + * yielded a string, or by a call to an expect function such as + * mpack_expect_str(). + * + * The given byte count must match the complete size of the string as + * returned by the tag or expect function. You must ensure that the + * buffer fits the data. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * If an error occurs, the buffer contents are undefined. + * + * Unlike mpack_read_bytes(), this cannot be used to read the data in + * chunks (since this might split a character's UTF-8 bytes, and the + * reader does not keep track of the UTF-8 decoding state between reads.) + * + * @throws mpack_error_type if the string contains invalid UTF-8. + */ +void mpack_read_utf8(mpack_reader_t* reader, char* p, size_t byte_count); + +/** + * Reads bytes from a string, ensures that the string contains no NUL + * bytes, copies the bytes into the given buffer and adds a null-terminator. + * + * A string must have been opened by a call to mpack_read_tag() which + * yielded a string, or by a call to an expect function such as + * mpack_expect_str(). + * + * The given byte count must match the size of the string as returned + * by the tag or expect function. The string will only be copied if + * the buffer is large enough to store it. + * + * If an error occurs, the buffer will contain an empty string. + * + * @note If you know the object will be a string before reading it, + * it is highly recommended to use mpack_expect_cstr() instead. + * Alternatively you could use mpack_peek_tag() and call + * mpack_expect_cstr() if it's a string. + * + * @throws mpack_error_too_big if the string plus null-terminator is larger than the given buffer size + * @throws mpack_error_type if the string contains a null byte. + * + * @see mpack_peek_tag() + * @see mpack_expect_cstr() + * @see mpack_expect_utf8_cstr() + */ +void mpack_read_cstr(mpack_reader_t* reader, char* buf, size_t buffer_size, size_t byte_count); + +/** + * Reads bytes from a string, ensures that the string is valid UTF-8 + * with no NUL bytes, copies the bytes into the given buffer and adds a + * null-terminator. + * + * A string must have been opened by a call to mpack_read_tag() which + * yielded a string, or by a call to an expect function such as + * mpack_expect_str(). + * + * The given byte count must match the size of the string as returned + * by the tag or expect function. The string will only be copied if + * the buffer is large enough to store it. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed, but without the NUL character, since + * it cannot be represented in a null-terminated string. + * + * If an error occurs, the buffer will contain an empty string. + * + * @note If you know the object will be a string before reading it, + * it is highly recommended to use mpack_expect_utf8_cstr() instead. + * Alternatively you could use mpack_peek_tag() and call + * mpack_expect_utf8_cstr() if it's a string. + * + * @throws mpack_error_too_big if the string plus null-terminator is larger than the given buffer size + * @throws mpack_error_type if the string contains invalid UTF-8 or a null byte. + * + * @see mpack_peek_tag() + * @see mpack_expect_utf8_cstr() + */ +void mpack_read_utf8_cstr(mpack_reader_t* reader, char* buf, size_t buffer_size, size_t byte_count); + +#ifdef MPACK_MALLOC +/** @cond */ +// This can optionally add a null-terminator, but it does not check +// whether the data contains null bytes. This must be done separately +// in a cstring read function (possibly as part of a UTF-8 check.) +char* mpack_read_bytes_alloc_impl(mpack_reader_t* reader, size_t count, bool null_terminated); +/** @endcond */ + +/** + * Reads bytes from a string, binary blob or extension object, allocating + * storage for them and returning the allocated pointer. + * + * The allocated string must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * Returns NULL if any error occurs, or if count is zero. + */ +MPACK_INLINE char* mpack_read_bytes_alloc(mpack_reader_t* reader, size_t count) { + return mpack_read_bytes_alloc_impl(reader, count, false); +} +#endif + +/** + * Reads bytes from a string, binary blob or extension object in-place in + * the buffer. This can be used to avoid copying the data. + * + * A str, bin or ext must have been opened by a call to mpack_read_tag() + * which yielded one of these types, or by a call to an expect function + * such as mpack_expect_str() or mpack_expect_bin(). + * + * If the bytes are from a string, the string is not null-terminated! Use + * mpack_read_cstr() to copy the string into a buffer and add a null-terminator. + * + * The returned pointer is invalidated on the next read, or when the buffer + * is destroyed. + * + * The reader will move data around in the buffer if needed to ensure that + * the pointer can always be returned, so this should only be used if + * count is very small compared to the buffer size. If you need to check + * whether a small size is reasonable (for example you intend to handle small and + * large sizes differently), you can call mpack_should_read_bytes_inplace(). + * + * This can be called multiple times for a single str, bin or ext + * to read the data in chunks. The total data read must add up + * to the size of the object. + * + * NULL is returned if the reader is in an error state. + * + * @throws mpack_error_too_big if the requested size is larger than the buffer size + * + * @see mpack_should_read_bytes_inplace() + */ +const char* mpack_read_bytes_inplace(mpack_reader_t* reader, size_t count); + +/** + * Reads bytes from a string in-place in the buffer and ensures they are + * valid UTF-8. This can be used to avoid copying the data. + * + * A string must have been opened by a call to mpack_read_tag() which + * yielded a string, or by a call to an expect function such as + * mpack_expect_str(). + * + * The string is not null-terminated! Use mpack_read_utf8_cstr() to + * copy the string into a buffer and add a null-terminator. + * + * The returned pointer is invalidated on the next read, or when the buffer + * is destroyed. + * + * The reader will move data around in the buffer if needed to ensure that + * the pointer can always be returned, so this should only be used if + * count is very small compared to the buffer size. If you need to check + * whether a small size is reasonable (for example you intend to handle small and + * large sizes differently), you can call mpack_should_read_bytes_inplace(). + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * Unlike mpack_read_bytes_inplace(), this cannot be used to read the data in + * chunks (since this might split a character's UTF-8 bytes, and the + * reader does not keep track of the UTF-8 decoding state between reads.) + * + * NULL is returned if the reader is in an error state. + * + * @throws mpack_error_type if the string contains invalid UTF-8 + * @throws mpack_error_too_big if the requested size is larger than the buffer size + * + * @see mpack_should_read_bytes_inplace() + */ +const char* mpack_read_utf8_inplace(mpack_reader_t* reader, size_t count); + +/** + * Returns true if it's a good idea to read the given number of bytes + * in-place. + * + * If the read will be larger than some small fraction of the buffer size, + * this will return false to avoid shuffling too much data back and forth + * in the buffer. + * + * Use this if you're expecting arbitrary size data, and you want to read + * in-place for the best performance when possible but will fall back to + * a normal read if the data is too large. + * + * @see mpack_read_bytes_inplace() + */ +MPACK_INLINE bool mpack_should_read_bytes_inplace(mpack_reader_t* reader, size_t count) { + return (reader->size == 0 || count <= reader->size / MPACK_READER_SMALL_FRACTION_DENOMINATOR); +} + +#if MPACK_EXTENSIONS +/** + * Reads a timestamp contained in an ext object of the given size, closing the + * ext type. + * + * An ext object of exttype @ref MPACK_EXTTYPE_TIMESTAMP must have been opened + * by a call to e.g. mpack_read_tag() or mpack_expect_ext(). + * + * You must NOT call mpack_done_ext() after calling this. A timestamp ext + * object can only contain a single timestamp value, so this calls + * mpack_done_ext() automatically. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @throws mpack_error_invalid if the size is not one of the supported + * timestamp sizes, or if the nanoseconds are out of range. + */ +mpack_timestamp_t mpack_read_timestamp(mpack_reader_t* reader, size_t size); +#endif + +/** + * @} + */ + +/** + * @name Core Reader Functions + * @{ + */ + +#if MPACK_READ_TRACKING +/** + * Finishes reading the given type. + * + * This will track reads to ensure that the correct number of elements + * or bytes are read. + */ +void mpack_done_type(mpack_reader_t* reader, mpack_type_t type); +#else +MPACK_INLINE void mpack_done_type(mpack_reader_t* reader, mpack_type_t type) { + MPACK_UNUSED(reader); + MPACK_UNUSED(type); +} +#endif + +/** + * Finishes reading an array. + * + * This will track reads to ensure that the correct number of elements are read. + */ +MPACK_INLINE void mpack_done_array(mpack_reader_t* reader) { + mpack_done_type(reader, mpack_type_array); +} + +/** + * @fn mpack_done_map(mpack_reader_t* reader) + * + * Finishes reading a map. + * + * This will track reads to ensure that the correct number of elements are read. + */ +MPACK_INLINE void mpack_done_map(mpack_reader_t* reader) { + mpack_done_type(reader, mpack_type_map); +} + +/** + * @fn mpack_done_str(mpack_reader_t* reader) + * + * Finishes reading a string. + * + * This will track reads to ensure that the correct number of bytes are read. + */ +MPACK_INLINE void mpack_done_str(mpack_reader_t* reader) { + mpack_done_type(reader, mpack_type_str); +} + +/** + * @fn mpack_done_bin(mpack_reader_t* reader) + * + * Finishes reading a binary data blob. + * + * This will track reads to ensure that the correct number of bytes are read. + */ +MPACK_INLINE void mpack_done_bin(mpack_reader_t* reader) { + mpack_done_type(reader, mpack_type_bin); +} + +#if MPACK_EXTENSIONS +/** + * @fn mpack_done_ext(mpack_reader_t* reader) + * + * Finishes reading an extended type binary data blob. + * + * This will track reads to ensure that the correct number of bytes are read. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +MPACK_INLINE void mpack_done_ext(mpack_reader_t* reader) { + mpack_done_type(reader, mpack_type_ext); +} +#endif + +/** + * Reads and discards the next object. This will read and discard all + * contained data as well if it is a compound type. + */ +void mpack_discard(mpack_reader_t* reader); + +/** + * @} + */ + +/** @cond */ + +#if MPACK_DEBUG && MPACK_STDIO +/** + * @name Debugging Functions + * @{ + */ +/* + * Converts a blob of MessagePack to a pseudo-JSON string for debugging + * purposes, placing the result in the given buffer with a null-terminator. + * + * If the buffer does not have enough space, the result will be truncated (but + * it is guaranteed to be null-terminated.) + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_print_data_to_buffer(const char* data, size_t data_size, char* buffer, size_t buffer_size); + +/* + * Converts a node to pseudo-JSON for debugging purposes, calling the given + * callback as many times as is necessary to output the character data. + * + * No null-terminator or trailing newline will be written. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_print_data_to_callback(const char* data, size_t size, mpack_print_callback_t callback, void* context); + +/* + * Converts a blob of MessagePack to pseudo-JSON for debugging purposes + * and pretty-prints it to the given file. + */ +void mpack_print_data_to_file(const char* data, size_t len, FILE* file); + +/* + * Converts a blob of MessagePack to pseudo-JSON for debugging purposes + * and pretty-prints it to stdout. + */ +MPACK_INLINE void mpack_print_data_to_stdout(const char* data, size_t len) { + mpack_print_data_to_file(data, len, stdout); +} + +/* + * Converts the MessagePack contained in the given `FILE*` to pseudo-JSON for + * debugging purposes, calling the given callback as many times as is necessary + * to output the character data. + */ +void mpack_print_stdfile_to_callback(FILE* file, mpack_print_callback_t callback, void* context); + +/* + * Deprecated. + * + * \deprecated Renamed to mpack_print_data_to_stdout(). + */ +MPACK_INLINE void mpack_print(const char* data, size_t len) { + mpack_print_data_to_stdout(data, len); +} + +/** + * @} + */ +#endif + +/** @endcond */ + +/** + * @} + */ + + + +#if MPACK_INTERNAL + +bool mpack_reader_ensure_straddle(mpack_reader_t* reader, size_t count); + +/* + * Ensures there are at least @c count bytes left in the + * data, raising an error and returning false if more + * data cannot be made available. + */ +MPACK_INLINE bool mpack_reader_ensure(mpack_reader_t* reader, size_t count) { + mpack_assert(count != 0, "cannot ensure zero bytes!"); + mpack_assert(reader->error == mpack_ok, "reader cannot be in an error state!"); + + if (count <= (size_t)(reader->end - reader->data)) + return true; + return mpack_reader_ensure_straddle(reader, count); +} + +void mpack_read_native_straddle(mpack_reader_t* reader, char* p, size_t count); + +// Reads count bytes into p, deferring to mpack_read_native_straddle() if more +// bytes are needed than are available in the buffer. +MPACK_INLINE void mpack_read_native(mpack_reader_t* reader, char* p, size_t count) { + mpack_assert(count == 0 || p != NULL, "data pointer for %i bytes is NULL", (int)count); + + if (count > (size_t)(reader->end - reader->data)) { + mpack_read_native_straddle(reader, p, count); + } else { + mpack_memcpy(p, reader->data, count); + reader->data += count; + } +} + +#if MPACK_READ_TRACKING +#define MPACK_READER_TRACK(reader, error_expr) \ + (((reader)->error == mpack_ok) ? mpack_reader_flag_if_error((reader), (error_expr)) : (reader)->error) +#else +#define MPACK_READER_TRACK(reader, error_expr) (MPACK_UNUSED(reader), mpack_ok) +#endif + +MPACK_INLINE mpack_error_t mpack_reader_track_element(mpack_reader_t* reader) { + return MPACK_READER_TRACK(reader, mpack_track_element(&reader->track, true)); +} + +MPACK_INLINE mpack_error_t mpack_reader_track_peek_element(mpack_reader_t* reader) { + return MPACK_READER_TRACK(reader, mpack_track_peek_element(&reader->track, true)); +} + +MPACK_INLINE mpack_error_t mpack_reader_track_bytes(mpack_reader_t* reader, uint64_t count) { + MPACK_UNUSED(count); + return MPACK_READER_TRACK(reader, mpack_track_bytes(&reader->track, true, count)); +} + +MPACK_INLINE mpack_error_t mpack_reader_track_str_bytes_all(mpack_reader_t* reader, uint64_t count) { + MPACK_UNUSED(count); + return MPACK_READER_TRACK(reader, mpack_track_str_bytes_all(&reader->track, true, count)); +} + +#endif + + + +#endif + +MPACK_HEADER_END + +#endif + + +/* mpack/mpack-expect.h.h */ + +/** + * @file + * + * Declares the MPack static Expect API. + */ + +#ifndef MPACK_EXPECT_H +#define MPACK_EXPECT_H 1 + +/* #include "mpack-reader.h" */ + +MPACK_HEADER_START + +#if MPACK_EXPECT + +#if !MPACK_READER +#error "MPACK_EXPECT requires MPACK_READER." +#endif + +/** + * @defgroup expect Expect API + * + * The MPack Expect API allows you to easily read MessagePack data when you + * expect it to follow a predefined schema. + * + * @note If you are not writing code for an embedded device (or otherwise do + * not need maximum performance with minimal memory usage), you should not use + * this. You probably want to use the @link node Node API@endlink instead. + * + * See @ref docs/expect.md for examples. + * + * The main purpose of the Expect API is convenience, so the API is lax. It + * automatically converts between similar types where there is no loss of + * precision. + * + * When using any of the expect functions, if the type or value of what was + * read does not match what is expected, @ref mpack_error_type is raised. + * + * @{ + */ + +/** + * @name Basic Number Functions + * @{ + */ + +/** + * Reads an 8-bit unsigned integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit unsigned int. + * + * Returns zero if an error occurs. + */ +uint8_t mpack_expect_u8(mpack_reader_t* reader); + +/** + * Reads a 16-bit unsigned integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit unsigned int. + * + * Returns zero if an error occurs. + */ +uint16_t mpack_expect_u16(mpack_reader_t* reader); + +/** + * Reads a 32-bit unsigned integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit unsigned int. + * + * Returns zero if an error occurs. + */ +uint32_t mpack_expect_u32(mpack_reader_t* reader); + +/** + * Reads a 64-bit unsigned integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit unsigned int. + * + * Returns zero if an error occurs. + */ +uint64_t mpack_expect_u64(mpack_reader_t* reader); + +/** + * Reads an 8-bit signed integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit signed int. + * + * Returns zero if an error occurs. + */ +int8_t mpack_expect_i8(mpack_reader_t* reader); + +/** + * Reads a 16-bit signed integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit signed int. + * + * Returns zero if an error occurs. + */ +int16_t mpack_expect_i16(mpack_reader_t* reader); + +/** + * Reads a 32-bit signed integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit signed int. + * + * Returns zero if an error occurs. + */ +int32_t mpack_expect_i32(mpack_reader_t* reader); + +/** + * Reads a 64-bit signed integer. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit signed int. + * + * Returns zero if an error occurs. + */ +int64_t mpack_expect_i64(mpack_reader_t* reader); + +/** + * Reads a number, returning the value as a float. The underlying value can be an + * integer, float or double; the value is converted to a float. + * + * @note Reading a double or a large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +float mpack_expect_float(mpack_reader_t* reader); + +/** + * Reads a number, returning the value as a double. The underlying value can be an + * integer, float or double; the value is converted to a double. + * + * @note Reading a very large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +double mpack_expect_double(mpack_reader_t* reader); + +/** + * Reads a float. The underlying value must be a float, not a double or an integer. + * This ensures no loss of precision can occur. + * + * @throws mpack_error_type if the underlying value is not a float. + */ +float mpack_expect_float_strict(mpack_reader_t* reader); + +/** + * Reads a double. The underlying value must be a float or double, not an integer. + * This ensures no loss of precision can occur. + * + * @throws mpack_error_type if the underlying value is not a float or double. + */ +double mpack_expect_double_strict(mpack_reader_t* reader); + +/** + * @} + */ + +/** + * @name Ranged Number Functions + * @{ + */ + +/** + * Reads an 8-bit unsigned integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit unsigned int. + * + * Returns min_value if an error occurs. + */ +uint8_t mpack_expect_u8_range(mpack_reader_t* reader, uint8_t min_value, uint8_t max_value); + +/** + * Reads a 16-bit unsigned integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit unsigned int. + * + * Returns min_value if an error occurs. + */ +uint16_t mpack_expect_u16_range(mpack_reader_t* reader, uint16_t min_value, uint16_t max_value); + +/** + * Reads a 32-bit unsigned integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit unsigned int. + * + * Returns min_value if an error occurs. + */ +uint32_t mpack_expect_u32_range(mpack_reader_t* reader, uint32_t min_value, uint32_t max_value); + +/** + * Reads a 64-bit unsigned integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit unsigned int. + * + * Returns min_value if an error occurs. + */ +uint64_t mpack_expect_u64_range(mpack_reader_t* reader, uint64_t min_value, uint64_t max_value); + +/** + * Reads an unsigned integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an unsigned int. + * + * Returns min_value if an error occurs. + */ +MPACK_INLINE unsigned int mpack_expect_uint_range(mpack_reader_t* reader, unsigned int min_value, unsigned int max_value) { + // This should be true at compile-time, so this just wraps the 32-bit + // function. We fallback to 64-bit if for some reason sizeof(int) isn't 4. + if (sizeof(unsigned int) == 4) + return (unsigned int)mpack_expect_u32_range(reader, (uint32_t)min_value, (uint32_t)max_value); + return (unsigned int)mpack_expect_u64_range(reader, min_value, max_value); +} + +/** + * Reads an 8-bit unsigned integer, ensuring that it is at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit unsigned int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE uint8_t mpack_expect_u8_max(mpack_reader_t* reader, uint8_t max_value) { + return mpack_expect_u8_range(reader, 0, max_value); +} + +/** + * Reads a 16-bit unsigned integer, ensuring that it is at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit unsigned int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE uint16_t mpack_expect_u16_max(mpack_reader_t* reader, uint16_t max_value) { + return mpack_expect_u16_range(reader, 0, max_value); +} + +/** + * Reads a 32-bit unsigned integer, ensuring that it is at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit unsigned int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE uint32_t mpack_expect_u32_max(mpack_reader_t* reader, uint32_t max_value) { + return mpack_expect_u32_range(reader, 0, max_value); +} + +/** + * Reads a 64-bit unsigned integer, ensuring that it is at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit unsigned int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE uint64_t mpack_expect_u64_max(mpack_reader_t* reader, uint64_t max_value) { + return mpack_expect_u64_range(reader, 0, max_value); +} + +/** + * Reads an unsigned integer, ensuring that it is at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an unsigned int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE unsigned int mpack_expect_uint_max(mpack_reader_t* reader, unsigned int max_value) { + return mpack_expect_uint_range(reader, 0, max_value); +} + +/** + * Reads an 8-bit signed integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit signed int. + * + * Returns min_value if an error occurs. + */ +int8_t mpack_expect_i8_range(mpack_reader_t* reader, int8_t min_value, int8_t max_value); + +/** + * Reads a 16-bit signed integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit signed int. + * + * Returns min_value if an error occurs. + */ +int16_t mpack_expect_i16_range(mpack_reader_t* reader, int16_t min_value, int16_t max_value); + +/** + * Reads a 32-bit signed integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit signed int. + * + * Returns min_value if an error occurs. + */ +int32_t mpack_expect_i32_range(mpack_reader_t* reader, int32_t min_value, int32_t max_value); + +/** + * Reads a 64-bit signed integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit signed int. + * + * Returns min_value if an error occurs. + */ +int64_t mpack_expect_i64_range(mpack_reader_t* reader, int64_t min_value, int64_t max_value); + +/** + * Reads a signed integer, ensuring that it falls within the given range. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a signed int. + * + * Returns min_value if an error occurs. + */ +MPACK_INLINE int mpack_expect_int_range(mpack_reader_t* reader, int min_value, int max_value) { + // This should be true at compile-time, so this just wraps the 32-bit + // function. We fallback to 64-bit if for some reason sizeof(int) isn't 4. + if (sizeof(int) == 4) + return (int)mpack_expect_i32_range(reader, (int32_t)min_value, (int32_t)max_value); + return (int)mpack_expect_i64_range(reader, min_value, max_value); +} + +/** + * Reads an 8-bit signed integer, ensuring that it is at least zero and at + * most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an 8-bit signed int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE int8_t mpack_expect_i8_max(mpack_reader_t* reader, int8_t max_value) { + return mpack_expect_i8_range(reader, 0, max_value); +} + +/** + * Reads a 16-bit signed integer, ensuring that it is at least zero and at + * most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 16-bit signed int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE int16_t mpack_expect_i16_max(mpack_reader_t* reader, int16_t max_value) { + return mpack_expect_i16_range(reader, 0, max_value); +} + +/** + * Reads a 32-bit signed integer, ensuring that it is at least zero and at + * most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 32-bit signed int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE int32_t mpack_expect_i32_max(mpack_reader_t* reader, int32_t max_value) { + return mpack_expect_i32_range(reader, 0, max_value); +} + +/** + * Reads a 64-bit signed integer, ensuring that it is at least zero and at + * most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a 64-bit signed int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE int64_t mpack_expect_i64_max(mpack_reader_t* reader, int64_t max_value) { + return mpack_expect_i64_range(reader, 0, max_value); +} + +/** + * Reads an int, ensuring that it is at least zero and at most @a max_value. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a signed int. + * + * Returns 0 if an error occurs. + */ +MPACK_INLINE int mpack_expect_int_max(mpack_reader_t* reader, int max_value) { + return mpack_expect_int_range(reader, 0, max_value); +} + +/** + * Reads a number, ensuring that it falls within the given range and returning + * the value as a float. The underlying value can be an integer, float or + * double; the value is converted to a float. + * + * @note Reading a double or a large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +float mpack_expect_float_range(mpack_reader_t* reader, float min_value, float max_value); + +/** + * Reads a number, ensuring that it falls within the given range and returning + * the value as a double. The underlying value can be an integer, float or + * double; the value is converted to a double. + * + * @note Reading a very large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +double mpack_expect_double_range(mpack_reader_t* reader, double min_value, double max_value); + +/** + * @} + */ + + + +// These are additional Basic Number functions that wrap inline range functions. + +/** + * @name Basic Number Functions + * @{ + */ + +/** + * Reads an unsigned int. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in an unsigned int. + * + * Returns zero if an error occurs. + */ +MPACK_INLINE unsigned int mpack_expect_uint(mpack_reader_t* reader) { + + // This should be true at compile-time, so this just wraps the 32-bit function. + if (sizeof(unsigned int) == 4) + return (unsigned int)mpack_expect_u32(reader); + + // Otherwise we wrap the max function to ensure it fits. + return (unsigned int)mpack_expect_u64_max(reader, UINT_MAX); + +} + +/** + * Reads a signed int. + * + * The underlying type may be an integer type of any size and signedness, + * as long as the value can be represented in a signed int. + * + * Returns zero if an error occurs. + */ +MPACK_INLINE int mpack_expect_int(mpack_reader_t* reader) { + + // This should be true at compile-time, so this just wraps the 32-bit function. + if (sizeof(int) == 4) + return (int)mpack_expect_i32(reader); + + // Otherwise we wrap the range function to ensure it fits. + return (int)mpack_expect_i64_range(reader, INT_MIN, INT_MAX); + +} + +/** + * @} + */ + + + +/** + * @name Matching Number Functions + * @{ + */ + +/** + * Reads an unsigned integer, ensuring that it exactly matches the given value. + * + * mpack_error_type is raised if the value is not representable as an unsigned + * integer or if it does not exactly match the given value. + */ +void mpack_expect_uint_match(mpack_reader_t* reader, uint64_t value); + +/** + * Reads a signed integer, ensuring that it exactly matches the given value. + * + * mpack_error_type is raised if the value is not representable as a signed + * integer or if it does not exactly match the given value. + */ +void mpack_expect_int_match(mpack_reader_t* reader, int64_t value); + +/** + * @name Other Basic Types + * @{ + */ + +/** + * Reads a nil, raising @ref mpack_error_type if the value is not nil. + */ +void mpack_expect_nil(mpack_reader_t* reader); + +/** + * Reads a boolean. + * + * @note Integers will raise mpack_error_type; the value must be strictly a boolean. + */ +bool mpack_expect_bool(mpack_reader_t* reader); + +/** + * Reads a boolean, raising @ref mpack_error_type if its value is not @c true. + */ +void mpack_expect_true(mpack_reader_t* reader); + +/** + * Reads a boolean, raising @ref mpack_error_type if its value is not @c false. + */ +void mpack_expect_false(mpack_reader_t* reader); + +/** + * @} + */ + +/** + * @name Extension Functions + * @{ + */ + +#if MPACK_EXTENSIONS +/** + * Reads a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +mpack_timestamp_t mpack_expect_timestamp(mpack_reader_t* reader); + +/** + * Reads a timestamp in seconds, truncating the nanoseconds (if any). + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +int64_t mpack_expect_timestamp_truncate(mpack_reader_t* reader); +#endif + +/** + * @} + */ + +/** + * @name Compound Types + * @{ + */ + +/** + * Reads the start of a map, returning its element count. + * + * A number of values follow equal to twice the element count of the map, + * alternating between keys and values. @ref mpack_done_map() must be called + * once all elements have been read. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * @warning This call is dangerous! It does not have a size limit, and it + * does not have any way of checking whether there is enough data in the + * message (since the data could be coming from a stream.) When looping + * through the map's contents, you must check for errors on each iteration + * of the loop. Otherwise an attacker could craft a message declaring a map + * of a billion elements which would throw your parsing code into an + * infinite loop! You should strongly consider using mpack_expect_map_max() + * with a safe maximum size instead. + * + * @throws mpack_error_type if the value is not a map. + */ +uint32_t mpack_expect_map(mpack_reader_t* reader); + +/** + * Reads the start of a map with a number of elements in the given range, returning + * its element count. + * + * A number of values follow equal to twice the element count of the map, + * alternating between keys and values. @ref mpack_done_map() must be called + * once all elements have been read. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * min_count is returned if an error occurs. + * + * @throws mpack_error_type if the value is not a map or if its size does + * not fall within the given range. + */ +uint32_t mpack_expect_map_range(mpack_reader_t* reader, uint32_t min_count, uint32_t max_count); + +/** + * Reads the start of a map with a number of elements at most @a max_count, + * returning its element count. + * + * A number of values follow equal to twice the element count of the map, + * alternating between keys and values. @ref mpack_done_map() must be called + * once all elements have been read. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * Zero is returned if an error occurs. + * + * @throws mpack_error_type if the value is not a map or if its size is + * greater than max_count. + */ +MPACK_INLINE uint32_t mpack_expect_map_max(mpack_reader_t* reader, uint32_t max_count) { + return mpack_expect_map_range(reader, 0, max_count); +} + +/** + * Reads the start of a map of the exact size given. + * + * A number of values follow equal to twice the element count of the map, + * alternating between keys and values. @ref mpack_done_map() must be called + * once all elements have been read. + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * @throws mpack_error_type if the value is not a map or if its size + * does not match the given count. + */ +void mpack_expect_map_match(mpack_reader_t* reader, uint32_t count); + +/** + * Reads a nil node or the start of a map, returning whether a map was + * read and placing its number of key/value pairs in count. + * + * If a map was read, a number of values follow equal to twice the element count + * of the map, alternating between keys and values. @ref mpack_done_map() should + * also be called once all elements have been read (only if a map was read.) + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. + * + * @warning This call is dangerous! It does not have a size limit, and it + * does not have any way of checking whether there is enough data in the + * message (since the data could be coming from a stream.) When looping + * through the map's contents, you must check for errors on each iteration + * of the loop. Otherwise an attacker could craft a message declaring a map + * of a billion elements which would throw your parsing code into an + * infinite loop! You should strongly consider using mpack_expect_map_max_or_nil() + * with a safe maximum size instead. + * + * @returns @c true if a map was read successfully; @c false if nil was read + * or an error occured. + * @throws mpack_error_type if the value is not a nil or map. + */ +bool mpack_expect_map_or_nil(mpack_reader_t* reader, uint32_t* count); + +/** + * Reads a nil node or the start of a map with a number of elements at most + * max_count, returning whether a map was read and placing its number of + * key/value pairs in count. + * + * If a map was read, a number of values follow equal to twice the element count + * of the map, alternating between keys and values. @ref mpack_done_map() should + * anlso be called once all elements have been read (only if a map was read.) + * + * @note Maps in JSON are unordered, so it is recommended not to expect + * a specific ordering for your map values in case your data is converted + * to/from JSON. Consider using mpack_expect_key_cstr() or mpack_expect_key_uint() + * to switch on the key; see @ref docs/expect.md for examples. + * + * @returns @c true if a map was read successfully; @c false if nil was read + * or an error occured. + * @throws mpack_error_type if the value is not a nil or map. + */ +bool mpack_expect_map_max_or_nil(mpack_reader_t* reader, uint32_t max_count, uint32_t* count); + +/** + * Reads the start of an array, returning its element count. + * + * A number of values follow equal to the element count of the array. + * @ref mpack_done_array() must be called once all elements have been read. + * + * @warning This call is dangerous! It does not have a size limit, and it + * does not have any way of checking whether there is enough data in the + * message (since the data could be coming from a stream.) When looping + * through the array's contents, you must check for errors on each iteration + * of the loop. Otherwise an attacker could craft a message declaring an array + * of a billion elements which would throw your parsing code into an + * infinite loop! You should strongly consider using mpack_expect_array_max() + * with a safe maximum size instead. + */ +uint32_t mpack_expect_array(mpack_reader_t* reader); + +/** + * Reads the start of an array with a number of elements in the given range, + * returning its element count. + * + * A number of values follow equal to the element count of the array. + * @ref mpack_done_array() must be called once all elements have been read. + * + * min_count is returned if an error occurs. + * + * @throws mpack_error_type if the value is not an array or if its size does + * not fall within the given range. + */ +uint32_t mpack_expect_array_range(mpack_reader_t* reader, uint32_t min_count, uint32_t max_count); + +/** + * Reads the start of an array with a number of elements at most @a max_count, + * returning its element count. + * + * A number of values follow equal to the element count of the array. + * @ref mpack_done_array() must be called once all elements have been read. + * + * Zero is returned if an error occurs. + * + * @throws mpack_error_type if the value is not an array or if its size is + * greater than max_count. + */ +MPACK_INLINE uint32_t mpack_expect_array_max(mpack_reader_t* reader, uint32_t max_count) { + return mpack_expect_array_range(reader, 0, max_count); +} + +/** + * Reads the start of an array of the exact size given. + * + * A number of values follow equal to the element count of the array. + * @ref mpack_done_array() must be called once all elements have been read. + * + * @throws mpack_error_type if the value is not an array or if its size does + * not match the given count. + */ +void mpack_expect_array_match(mpack_reader_t* reader, uint32_t count); + +/** + * Reads a nil node or the start of an array, returning whether an array was + * read and placing its number of elements in count. + * + * If an array was read, a number of values follow equal to the element count + * of the array. @ref mpack_done_array() should also be called once all elements + * have been read (only if an array was read.) + * + * @warning This call is dangerous! It does not have a size limit, and it + * does not have any way of checking whether there is enough data in the + * message (since the data could be coming from a stream.) When looping + * through the array's contents, you must check for errors on each iteration + * of the loop. Otherwise an attacker could craft a message declaring an array + * of a billion elements which would throw your parsing code into an + * infinite loop! You should strongly consider using mpack_expect_array_max_or_nil() + * with a safe maximum size instead. + * + * @returns @c true if an array was read successfully; @c false if nil was read + * or an error occured. + * @throws mpack_error_type if the value is not a nil or array. + */ +bool mpack_expect_array_or_nil(mpack_reader_t* reader, uint32_t* count); + +/** + * Reads a nil node or the start of an array with a number of elements at most + * max_count, returning whether an array was read and placing its number of + * key/value pairs in count. + * + * If an array was read, a number of values follow equal to the element count + * of the array. @ref mpack_done_array() should also be called once all elements + * have been read (only if an array was read.) + * + * @returns @c true if an array was read successfully; @c false if nil was read + * or an error occured. + * @throws mpack_error_type if the value is not a nil or array. + */ +bool mpack_expect_array_max_or_nil(mpack_reader_t* reader, uint32_t max_count, uint32_t* count); + +#ifdef MPACK_MALLOC +/** + * @hideinitializer + * + * Reads the start of an array and allocates storage for it, placing its + * size in out_count. A number of objects follow equal to the element count + * of the array. You must call @ref mpack_done_array() when done (even + * if the element count is zero.) + * + * If an error occurs, NULL is returned and the reader is placed in an + * error state. + * + * If the count is zero, NULL is returned. This does not indicate error. + * You should not check the return value for NULL to check for errors; only + * check the reader's error state. + * + * The allocated array must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_type if the value is not an array or if its size is + * greater than max_count. + */ +#define mpack_expect_array_alloc(reader, Type, max_count, out_count) \ + ((Type*)mpack_expect_array_alloc_impl(reader, sizeof(Type), max_count, out_count, false)) + +/** + * @hideinitializer + * + * Reads a nil node or the start of an array and allocates storage for it, + * placing its size in out_count. A number of objects follow equal to the element + * count of the array if a non-empty array was read. + * + * If an error occurs, NULL is returned and the reader is placed in an + * error state. + * + * If a nil node was read, NULL is returned. If an empty array was read, + * mpack_done_array() is called automatically and NULL is returned. These + * do not indicate error. You should not check the return value for NULL + * to check for errors; only check the reader's error state. + * + * The allocated array must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @warning You must call @ref mpack_done_array() if and only if a non-zero + * element count is read. This function does not differentiate between nil + * and an empty array. + * + * @throws mpack_error_type if the value is not an array or if its size is + * greater than max_count. + */ +#define mpack_expect_array_or_nil_alloc(reader, Type, max_count, out_count) \ + ((Type*)mpack_expect_array_alloc_impl(reader, sizeof(Type), max_count, out_count, true)) +#endif + +/** + * @} + */ + +/** @cond */ +#ifdef MPACK_MALLOC +void* mpack_expect_array_alloc_impl(mpack_reader_t* reader, + size_t element_size, uint32_t max_count, uint32_t* out_count, bool allow_nil); +#endif +/** @endcond */ + + +/** + * @name String Functions + * @{ + */ + +/** + * Reads the start of a string, returning its size in bytes. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). mpack_done_str() must be called + * once all bytes have been read. + * + * NUL bytes are allowed in the string, and no encoding checks are done. + * + * mpack_error_type is raised if the value is not a string. + */ +uint32_t mpack_expect_str(mpack_reader_t* reader); + +/** + * Reads a string of at most the given size, writing it into the + * given buffer and returning its size in bytes. + * + * This does not add a null-terminator! Use mpack_expect_cstr() to + * add a null-terminator. + * + * NUL bytes are allowed in the string, and no encoding checks are done. + */ +size_t mpack_expect_str_buf(mpack_reader_t* reader, char* buf, size_t bufsize); + +/** + * Reads a string into the given buffer, ensuring it is a valid UTF-8 string + * and returning its size in bytes. + * + * This does not add a null-terminator! Use mpack_expect_utf8_cstr() to + * add a null-terminator. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed. + * + * NUL bytes are allowed in the string (as they are in UTF-8.) + * + * Raises mpack_error_too_big if there is not enough room for the string. + * Raises mpack_error_type if the value is not a string or is not a valid UTF-8 string. + */ +size_t mpack_expect_utf8(mpack_reader_t* reader, char* buf, size_t bufsize); + +/** + * Reads the start of a string, raising an error if its length is not + * at most the given number of bytes (not including any null-terminator.) + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_str() must be called + * once all bytes have been read. + * + * @throws mpack_error_type If the value is not a string. + * @throws mpack_error_too_big If the string's length in bytes is larger than the given maximum size. + */ +MPACK_INLINE uint32_t mpack_expect_str_max(mpack_reader_t* reader, uint32_t maxsize) { + uint32_t length = mpack_expect_str(reader); + if (length > maxsize) { + mpack_reader_flag_error(reader, mpack_error_too_big); + return 0; + } + return length; +} + +/** + * Reads the start of a string, raising an error if its length is not + * exactly the given number of bytes (not including any null-terminator.) + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_str() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not a string or if its + * length does not match. + */ +MPACK_INLINE void mpack_expect_str_length(mpack_reader_t* reader, uint32_t count) { + if (mpack_expect_str(reader) != count) + mpack_reader_flag_error(reader, mpack_error_type); +} + +/** + * Reads a string, ensuring it exactly matches the given string. + * + * Remember that maps are unordered in JSON. Don't use this for map keys + * unless the map has only a single key! + */ +void mpack_expect_str_match(mpack_reader_t* reader, const char* str, size_t length); + +/** + * Reads a string into the given buffer, ensures it has no null bytes, + * and adds a null-terminator at the end. + * + * Raises mpack_error_too_big if there is not enough room for the string and null-terminator. + * Raises mpack_error_type if the value is not a string or contains a null byte. + */ +void mpack_expect_cstr(mpack_reader_t* reader, char* buf, size_t size); + +/** + * Reads a string into the given buffer, ensures it is a valid UTF-8 string + * without NUL characters, and adds a null-terminator at the end. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed, but without the NUL character, since + * it cannot be represented in a null-terminated string. + * + * Raises mpack_error_too_big if there is not enough room for the string and null-terminator. + * Raises mpack_error_type if the value is not a string or is not a valid UTF-8 string. + */ +void mpack_expect_utf8_cstr(mpack_reader_t* reader, char* buf, size_t size); + +#ifdef MPACK_MALLOC +/** + * Reads a string with the given total maximum size (including space for a + * null-terminator), allocates storage for it, ensures it has no null-bytes, + * and adds a null-terminator at the end. You assume ownership of the + * returned pointer if reading succeeds. + * + * The allocated string must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_too_big If the string plus null-terminator is larger than the given maxsize. + * @throws mpack_error_type If the value is not a string or contains a null byte. + */ +char* mpack_expect_cstr_alloc(mpack_reader_t* reader, size_t maxsize); + +/** + * Reads a string with the given total maximum size (including space for a + * null-terminator), allocates storage for it, ensures it is valid UTF-8 + * with no null-bytes, and adds a null-terminator at the end. You assume + * ownership of the returned pointer if reading succeeds. + * + * The length in bytes of the string, not including the null-terminator, + * will be written to size. + * + * This does not accept any UTF-8 variant such as Modified UTF-8, CESU-8 or + * WTF-8. Only pure UTF-8 is allowed, but without the NUL character, since + * it cannot be represented in a null-terminated string. + * + * The allocated string must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * if you want a null-terminator. + * + * @throws mpack_error_too_big If the string plus null-terminator is larger + * than the given maxsize. + * @throws mpack_error_type If the value is not a string or contains + * invalid UTF-8 or a null byte. + */ +char* mpack_expect_utf8_cstr_alloc(mpack_reader_t* reader, size_t maxsize); +#endif + +/** + * Reads a string, ensuring it exactly matches the given null-terminated + * string. + * + * Remember that maps are unordered in JSON. Don't use this for map keys + * unless the map has only a single key! + */ +MPACK_INLINE void mpack_expect_cstr_match(mpack_reader_t* reader, const char* cstr) { + mpack_assert(cstr != NULL, "cstr pointer is NULL"); + mpack_expect_str_match(reader, cstr, mpack_strlen(cstr)); +} + +/** + * @} + */ + +/** + * @name Binary Data + * @{ + */ + +/** + * Reads the start of a binary blob, returning its size in bytes. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_bin() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not a binary blob. + */ +uint32_t mpack_expect_bin(mpack_reader_t* reader); + +/** + * Reads the start of a binary blob, raising an error if its length is not + * at most the given number of bytes. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_bin() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not a binary blob or if its + * length does not match. + */ +MPACK_INLINE uint32_t mpack_expect_bin_max(mpack_reader_t* reader, uint32_t maxsize) { + uint32_t length = mpack_expect_bin(reader); + if (length > maxsize) { + mpack_reader_flag_error(reader, mpack_error_type); + return 0; + } + return length; +} + +/** + * Reads the start of a binary blob, raising an error if its length is not + * exactly the given number of bytes. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_bin() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not a binary blob or if its + * length does not match. + */ +MPACK_INLINE void mpack_expect_bin_size(mpack_reader_t* reader, uint32_t count) { + if (mpack_expect_bin(reader) != count) + mpack_reader_flag_error(reader, mpack_error_type); +} + +/** + * Reads a binary blob into the given buffer, returning its size in bytes. + * + * For compatibility, this will accept if the underlying type is string or + * binary (since in MessagePack 1.0, strings and binary data were combined + * under the "raw" type which became string in 1.1.) + */ +size_t mpack_expect_bin_buf(mpack_reader_t* reader, char* buf, size_t size); + +/** + * Reads a binary blob with the given total maximum size, allocating storage for it. + */ +char* mpack_expect_bin_alloc(mpack_reader_t* reader, size_t maxsize, size_t* size); + +/** + * @} + */ + +/** + * @name Extension Functions + * @{ + */ + +#if MPACK_EXTENSIONS +/** + * Reads the start of an extension blob, returning its size in bytes and + * placing the type into @p type. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_ext() must be called + * once all bytes have been read. + * + * @p type will be a user-defined type in the range [0,127] or a reserved type + * in the range [-128,-2]. + * + * mpack_error_type is raised if the value is not an extension blob. The @p + * type value is zero if an error occurs. + * + * @note This cannot be used to match a timestamp. @ref mpack_error_type will + * be flagged if the value is a timestamp. Use mpack_expect_timestamp() or + * mpack_expect_timestamp_truncate() instead. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @warning Be careful when using reserved types. They may no longer be ext + * types in the future, and previously valid data containing reserved types may + * become invalid in the future. + */ +uint32_t mpack_expect_ext(mpack_reader_t* reader, int8_t* type); + +/** + * Reads the start of an extension blob, raising an error if its length is not + * at most the given number of bytes and placing the type into @p type. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_ext() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not an extension blob or if its + * length does not match. The @p type value is zero if an error is raised. + * + * @p type will be a user-defined type in the range [0,127] or a reserved type + * in the range [-128,-2]. + * + * @note This cannot be used to match a timestamp. @ref mpack_error_type will + * be flagged if the value is a timestamp. Use mpack_expect_timestamp() or + * mpack_expect_timestamp_truncate() instead. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @warning Be careful when using reserved types. They may no longer be ext + * types in the future, and previously valid data containing reserved types may + * become invalid in the future. + * + * @see mpack_expect_ext() + */ +MPACK_INLINE uint32_t mpack_expect_ext_max(mpack_reader_t* reader, int8_t* type, uint32_t maxsize) { + uint32_t length = mpack_expect_ext(reader, type); + if (length > maxsize) { + mpack_reader_flag_error(reader, mpack_error_type); + return 0; + } + return length; +} + +/** + * Reads the start of an extension blob, raising an error if its length is not + * exactly the given number of bytes and placing the type into @p type. + * + * The bytes follow and must be read separately with mpack_read_bytes() + * or mpack_read_bytes_inplace(). @ref mpack_done_ext() must be called + * once all bytes have been read. + * + * mpack_error_type is raised if the value is not an extension blob or if its + * length does not match. The @p type value is zero if an error is raised. + * + * @p type will be a user-defined type in the range [0,127] or a reserved type + * in the range [-128,-2]. + * + * @note This cannot be used to match a timestamp. @ref mpack_error_type will + * be flagged if the value is a timestamp. Use mpack_expect_timestamp() or + * mpack_expect_timestamp_truncate() instead. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @warning Be careful when using reserved types. They may no longer be ext + * types in the future, and previously valid data containing reserved types may + * become invalid in the future. + * + * @see mpack_expect_ext() + */ +MPACK_INLINE void mpack_expect_ext_size(mpack_reader_t* reader, int8_t* type, uint32_t count) { + if (mpack_expect_ext(reader, type) != count) { + *type = 0; + mpack_reader_flag_error(reader, mpack_error_type); + } +} + +/** + * Reads an extension blob into the given buffer, returning its size in bytes + * and placing the type into @p type. + * + * mpack_error_type is raised if the value is not an extension blob or if its + * length does not match. The @p type value is zero if an error is raised. + * + * @p type will be a user-defined type in the range [0,127] or a reserved type + * in the range [-128,-2]. + * + * @note This cannot be used to match a timestamp. @ref mpack_error_type will + * be flagged if the value is a timestamp. Use mpack_expect_timestamp() or + * mpack_expect_timestamp_truncate() instead. + * + * @warning Be careful when using reserved types. They may no longer be ext + * types in the future, and previously valid data containing reserved types may + * become invalid in the future. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @see mpack_expect_ext() + */ +size_t mpack_expect_ext_buf(mpack_reader_t* reader, int8_t* type, char* buf, size_t size); +#endif + +#if MPACK_EXTENSIONS && defined(MPACK_MALLOC) +/** + * Reads an extension blob with the given total maximum size, allocating + * storage for it, and placing the type into @p type. + * + * mpack_error_type is raised if the value is not an extension blob or if its + * length does not match. The @p type value is zero if an error is raised. + * + * @p type will be a user-defined type in the range [0,127] or a reserved type + * in the range [-128,-2]. + * + * @note This cannot be used to match a timestamp. @ref mpack_error_type will + * be flagged if the value is a timestamp. Use mpack_expect_timestamp() or + * mpack_expect_timestamp_truncate() instead. + * + * @warning Be careful when using reserved types. They may no longer be ext + * types in the future, and previously valid data containing reserved types may + * become invalid in the future. + * + * @note This requires @ref MPACK_EXTENSIONS and @ref MPACK_MALLOC. + * + * @see mpack_expect_ext() + */ +char* mpack_expect_ext_alloc(mpack_reader_t* reader, int8_t* type, size_t maxsize, size_t* size); +#endif + +/** + * @} + */ + +/** + * @name Special Functions + * @{ + */ + +/** + * Reads a MessagePack object header (an MPack tag), expecting it to exactly + * match the given tag. + * + * If the type is compound (i.e. is a map, array, string, binary or + * extension type), additional reads are required to get the contained + * data, and the corresponding done function must be called when done. + * + * @throws mpack_error_type if the tag does not match + * + * @see mpack_read_bytes() + * @see mpack_done_array() + * @see mpack_done_map() + * @see mpack_done_str() + * @see mpack_done_bin() + * @see mpack_done_ext() + */ +void mpack_expect_tag(mpack_reader_t* reader, mpack_tag_t tag); + +/** + * Expects a string matching one of the strings in the given array, + * returning its array index. + * + * If the value does not match any of the given strings, + * @ref mpack_error_type is flagged. Use mpack_expect_enum_optional() + * if you want to allow other values than the given strings. + * + * If any error occurs or the reader is in an error state, @a count + * is returned. + * + * This can be used to quickly parse a string into an enum when the + * enum values range from 0 to @a count-1. If the last value in the + * enum is a special "count" value, it can be passed as the count, + * and the return value can be cast directly to the enum type. + * + * @code{.c} + * typedef enum { APPLE , BANANA , ORANGE , COUNT} fruit_t; + * const char* fruits[] = {"apple", "banana", "orange"}; + * + * fruit_t fruit = (fruit_t)mpack_expect_enum(reader, fruits, COUNT); + * @endcode + * + * See @ref docs/expect.md for more examples. + * + * The maximum string length is the size of the buffer (strings are read in-place.) + * + * @param reader The reader + * @param strings An array of expected strings of length count + * @param count The number of strings + * @return The index of the matched string, or @a count in case of error + */ +size_t mpack_expect_enum(mpack_reader_t* reader, const char* strings[], size_t count); + +/** + * Expects a string matching one of the strings in the given array + * returning its array index, or @a count if no strings match. + * + * If the value is not a string, or it does not match any of the + * given strings, @a count is returned and no error is flagged. + * + * If any error occurs or the reader is in an error state, @a count + * is returned. + * + * This can be used to quickly parse a string into an enum when the + * enum values range from 0 to @a count-1. If the last value in the + * enum is a special "count" value, it can be passed as the count, + * and the return value can be cast directly to the enum type. + * + * @code{.c} + * typedef enum { APPLE , BANANA , ORANGE , COUNT} fruit_t; + * const char* fruits[] = {"apple", "banana", "orange"}; + * + * fruit_t fruit = (fruit_t)mpack_expect_enum_optional(reader, fruits, COUNT); + * @endcode + * + * See @ref docs/expect.md for more examples. + * + * The maximum string length is the size of the buffer (strings are read in-place.) + * + * @param reader The reader + * @param strings An array of expected strings of length count + * @param count The number of strings + * + * @return The index of the matched string, or @a count if it does not + * match or an error occurs + */ +size_t mpack_expect_enum_optional(mpack_reader_t* reader, const char* strings[], size_t count); + +/** + * Expects an unsigned integer map key between 0 and count-1, marking it + * as found in the given bool array and returning it. + * + * This is a helper for switching among int keys in a map. It is + * typically used with an enum to define the key values. It should + * be called in the expression of a switch() statement. See @ref + * docs/expect.md for an example. + * + * The found array must be cleared before expecting the first key. If the + * flag for a given key is already set when found (i.e. the map contains a + * duplicate key), mpack_error_invalid is flagged. + * + * If the key is not a non-negative integer, or if the key is @a count or + * larger, @a count is returned and no error is flagged. If you want an error + * on unrecognized keys, flag an error in the default case in your switch; + * otherwise you must call mpack_discard() to discard its content. + * + * @param reader The reader + * @param found An array of bool flags of length count + * @param count The number of values in the found array, and one more than the + * maximum allowed key + * + * @see @ref docs/expect.md + */ +size_t mpack_expect_key_uint(mpack_reader_t* reader, bool found[], size_t count); + +/** + * Expects a string map key matching one of the strings in the given key list, + * marking it as found in the given bool array and returning its index. + * + * This is a helper for switching among string keys in a map. It is + * typically used with an enum with names matching the strings in the + * array to define the key indices. It should be called in the expression + * of a switch() statement. See @ref docs/expect.md for an example. + * + * The found array must be cleared before expecting the first key. If the + * flag for a given key is already set when found (i.e. the map contains a + * duplicate key), mpack_error_invalid is flagged. + * + * If the key is unrecognized, count is returned and no error is flagged. If + * you want an error on unrecognized keys, flag an error in the default case + * in your switch; otherwise you must call mpack_discard() to discard its content. + * + * The maximum key length is the size of the buffer (keys are read in-place.) + * + * @param reader The reader + * @param keys An array of expected string keys of length count + * @param found An array of bool flags of length count + * @param count The number of values in the keys and found arrays + * + * @see @ref docs/expect.md + */ +size_t mpack_expect_key_cstr(mpack_reader_t* reader, const char* keys[], + bool found[], size_t count); + +/** + * @} + */ + +/** + * @} + */ + +#endif + +MPACK_HEADER_END + +#endif + + + +/* mpack/mpack-node.h.h */ + +/** + * @file + * + * Declares the MPack dynamic Node API. + */ + +#ifndef MPACK_NODE_H +#define MPACK_NODE_H 1 + +/* #include "mpack-reader.h" */ + +MPACK_HEADER_START + +#if MPACK_NODE + +/** + * @defgroup node Node API + * + * The MPack Node API allows you to parse a chunk of MessagePack into a + * dynamically typed data structure, providing random access to the parsed + * data. + * + * See @ref docs/node.md for examples. + * + * @{ + */ + +/** + * A handle to node data in a parsed MPack tree. + * + * Nodes represent either primitive values or compound types. If a + * node is a compound type, it contains a pointer to its child nodes, + * or a pointer to its underlying data. + * + * Nodes are immutable. + * + * @note @ref mpack_node_t is an opaque reference to the node data, not the + * node data itself. (It contains pointers to both the node data and the tree.) + * It is passed by value in the Node API. + */ +typedef struct mpack_node_t mpack_node_t; + +/** + * The storage for nodes in an MPack tree. + * + * You only need to use this if you intend to provide your own storage + * for nodes instead of letting the tree allocate it. + * + * @ref mpack_node_data_t is 16 bytes on most common architectures (32-bit + * and 64-bit.) + */ +typedef struct mpack_node_data_t mpack_node_data_t; + +/** + * An MPack tree parser to parse a blob or stream of MessagePack. + * + * When a message is parsed, the tree contains a single root node which + * contains all parsed data. The tree and its nodes are immutable. + */ +typedef struct mpack_tree_t mpack_tree_t; + +/** + * An error handler function to be called when an error is flagged on + * the tree. + * + * The error handler will only be called once on the first error flagged; + * any subsequent node reads and errors are ignored, and the tree is + * permanently in that error state. + * + * MPack is safe against non-local jumps out of error handler callbacks. + * This means you are allowed to longjmp or throw an exception (in C++, + * Objective-C, or with SEH) out of this callback. + * + * Bear in mind when using longjmp that local non-volatile variables that + * have changed are undefined when setjmp() returns, so you can't put the + * tree on the stack in the same activation frame as the setjmp without + * declaring it volatile. + * + * You must still eventually destroy the tree. It is not destroyed + * automatically when an error is flagged. It is safe to destroy the + * tree within this error callback, but you will either need to perform + * a non-local jump, or store something in your context to identify + * that the tree is destroyed since any future accesses to it cause + * undefined behavior. + */ +typedef void (*mpack_tree_error_t)(mpack_tree_t* tree, mpack_error_t error); + +/** + * The MPack tree's read function. It should fill the buffer with as many bytes + * as are immediately available up to the given @c count, returning the number + * of bytes written to the buffer. + * + * In case of error, it should flag an appropriate error on the reader + * (usually @ref mpack_error_io.) + * + * The blocking or non-blocking behaviour of the read should match whether you + * are using mpack_tree_parse() or mpack_tree_try_parse(). + * + * If you are using mpack_tree_parse(), the read should block until at least + * one byte is read. If you return 0, mpack_tree_parse() will raise @ref + * mpack_error_io. + * + * If you are using mpack_tree_try_parse(), the read function can always + * return 0, and must never block waiting for data (otherwise + * mpack_tree_try_parse() would be equivalent to mpack_tree_parse().) + * When you return 0, mpack_tree_try_parse() will return false without flagging + * an error. + */ +typedef size_t (*mpack_tree_read_t)(mpack_tree_t* tree, char* buffer, size_t count); + +/** + * A teardown function to be called when the tree is destroyed. + */ +typedef void (*mpack_tree_teardown_t)(mpack_tree_t* tree); + + + +/* Hide internals from documentation */ +/** @cond */ + +struct mpack_node_t { + mpack_node_data_t* data; + mpack_tree_t* tree; +}; + +struct mpack_node_data_t { + mpack_type_t type; + + /* + * The element count if the type is an array; + * the number of key/value pairs if the type is map; + * or the number of bytes if the type is str, bin or ext. + */ + uint32_t len; + + union + { + bool b; /* The value if the type is bool. */ + float f; /* The value if the type is float. */ + double d; /* The value if the type is double. */ + int64_t i; /* The value if the type is signed int. */ + uint64_t u; /* The value if the type is unsigned int. */ + size_t offset; /* The byte offset for str, bin and ext */ + mpack_node_data_t* children; /* The children for map or array */ + } value; +}; + +typedef struct mpack_tree_page_t { + struct mpack_tree_page_t* next; + mpack_node_data_t nodes[1]; // variable size +} mpack_tree_page_t; + +typedef enum mpack_tree_parse_state_t { + mpack_tree_parse_state_not_started, + mpack_tree_parse_state_in_progress, + mpack_tree_parse_state_parsed, +} mpack_tree_parse_state_t; + +typedef struct mpack_level_t { + mpack_node_data_t* child; + size_t left; // children left in level +} mpack_level_t; + +typedef struct mpack_tree_parser_t { + mpack_tree_parse_state_t state; + + // We keep track of the number of "possible nodes" left in the data rather + // than the number of bytes. + // + // When a map or array is parsed, we ensure at least one byte for each child + // exists and subtract them right away. This ensures that if ever a map or + // array declares more elements than could possibly be contained in the data, + // we will error out immediately rather than allocating storage for them. + // + // For example malicious data that repeats 0xDE 0xFF 0xFF (start of a map + // with 65536 key-value pairs) would otherwise cause us to run out of + // memory. With this, the parser can allocate at most as many nodes as + // there are bytes in the data (plus the paging overhead, 12%.) An error + // will be flagged immediately if and when there isn't enough data left to + // fully read all children of all open compound types on the parsing stack. + // + // Once an entire message has been parsed (and there are no nodes left to + // parse whose bytes have been subtracted), this matches the number of left + // over bytes in the data. + size_t possible_nodes_left; + + mpack_node_data_t* nodes; // next node in current page/pool + size_t nodes_left; // nodes left in current page/pool + + size_t current_node_reserved; + size_t level; + + #ifdef MPACK_MALLOC + // It's much faster to allocate the initial parsing stack inline within the + // parser. We replace it with a heap allocation if we need to grow it. + mpack_level_t* stack; + size_t stack_capacity; + bool stack_owned; + mpack_level_t stack_local[MPACK_NODE_INITIAL_DEPTH]; + #else + // Without malloc(), we have to reserve a parsing stack the maximum allowed + // parsing depth. + mpack_level_t stack[MPACK_NODE_MAX_DEPTH_WITHOUT_MALLOC]; + #endif +} mpack_tree_parser_t; + +struct mpack_tree_t { + mpack_tree_error_t error_fn; /* Function to call on error */ + mpack_tree_read_t read_fn; /* Function to call to read more data */ + mpack_tree_teardown_t teardown; /* Function to teardown the context on destroy */ + void* context; /* Context for tree callbacks */ + + mpack_node_data_t nil_node; /* a nil node to be returned in case of error */ + mpack_node_data_t missing_node; /* a missing node to be returned in optional lookups */ + mpack_error_t error; + + #ifdef MPACK_MALLOC + char* buffer; + size_t buffer_capacity; + #endif + + const char* data; + size_t data_length; // length of data (and content of buffer, if used) + + size_t size; // size in bytes of tree (usually matches data_length, but not if tree has trailing data) + size_t node_count; // total number of nodes in tree (across all pages) + + size_t max_size; // maximum message size + size_t max_nodes; // maximum nodes in a message + + mpack_tree_parser_t parser; + mpack_node_data_t* root; + + mpack_node_data_t* pool; // pool, or NULL if no pool provided + size_t pool_count; + + #ifdef MPACK_MALLOC + mpack_tree_page_t* next; + #endif +}; + +// internal functions + +MPACK_INLINE mpack_node_t mpack_node(mpack_tree_t* tree, mpack_node_data_t* data) { + mpack_node_t node; + node.data = data; + node.tree = tree; + return node; +} + +MPACK_INLINE mpack_node_data_t* mpack_node_child(mpack_node_t node, size_t child) { + return node.data->value.children + child; +} + +MPACK_INLINE mpack_node_t mpack_tree_nil_node(mpack_tree_t* tree) { + return mpack_node(tree, &tree->nil_node); +} + +MPACK_INLINE mpack_node_t mpack_tree_missing_node(mpack_tree_t* tree) { + return mpack_node(tree, &tree->missing_node); +} + +/** @endcond */ + + + +/** + * @name Tree Initialization + * @{ + */ + +#ifdef MPACK_MALLOC +/** + * Initializes a tree parser with the given data. + * + * Configure the tree if desired, then call mpack_tree_parse() to parse it. The + * tree will allocate pages of nodes as needed and will free them when + * destroyed. + * + * The tree must be destroyed with mpack_tree_destroy(). + * + * Any string or blob data types reference the original data, so the given data + * pointer must remain valid until after the tree is destroyed. + */ +void mpack_tree_init_data(mpack_tree_t* tree, const char* data, size_t length); + +/** + * Deprecated. + * + * \deprecated Renamed to mpack_tree_init_data(). + */ +MPACK_INLINE void mpack_tree_init(mpack_tree_t* tree, const char* data, size_t length) { + mpack_tree_init_data(tree, data, length); +} + +/** + * Initializes a tree parser from an unbounded stream, or a stream of + * unknown length. + * + * The parser can be used to read a single message from a stream of unknown + * length, or multiple messages from an unbounded stream, allowing it to + * be used for RPC communication. Call @ref mpack_tree_parse() to parse + * a message from a blocking stream, or @ref mpack_tree_try_parse() for a + * non-blocking stream. + * + * The stream will use a growable internal buffer to store the most recent + * message, as well as allocated pages of nodes for the parse tree. + * + * Maximum allowances for message size and node count must be specified in this + * function (since the stream is unbounded.) They can be changed later with + * @ref mpack_tree_set_limits(). + * + * @param tree The tree parser + * @param read_fn The read function + * @param context The context for the read function + * @param max_message_size The maximum size of a message in bytes + * @param max_message_nodes The maximum number of nodes per message. See + * @ref mpack_node_data_t for the size of nodes. + * + * @see mpack_tree_read_t + * @see mpack_reader_context() + */ +void mpack_tree_init_stream(mpack_tree_t* tree, mpack_tree_read_t read_fn, void* context, + size_t max_message_size, size_t max_message_nodes); +#endif + +/** + * Initializes a tree parser with the given data, using the given node data + * pool to store the results. + * + * Configure the tree if desired, then call mpack_tree_parse() to parse it. + * + * If the data does not fit in the pool, @ref mpack_error_too_big will be flagged + * on the tree. + * + * The tree must be destroyed with mpack_tree_destroy(), even if parsing fails. + */ +void mpack_tree_init_pool(mpack_tree_t* tree, const char* data, size_t length, + mpack_node_data_t* node_pool, size_t node_pool_count); + +/** + * Initializes an MPack tree directly into an error state. Use this if you + * are writing a wrapper to another <tt>mpack_tree_init*()</tt> function which + * can fail its setup. + */ +void mpack_tree_init_error(mpack_tree_t* tree, mpack_error_t error); + +#if MPACK_STDIO +/** + * Initializes a tree to parse the given file. The tree must be destroyed with + * mpack_tree_destroy(), even if parsing fails. + * + * The file is opened, loaded fully into memory, and closed before this call + * returns. + * + * @param tree The tree to initialize + * @param filename The filename passed to fopen() to read the file + * @param max_bytes The maximum size of file to load, or 0 for unlimited size. + */ +void mpack_tree_init_filename(mpack_tree_t* tree, const char* filename, size_t max_bytes); + +/** + * Deprecated. + * + * \deprecated Renamed to mpack_tree_init_filename(). + */ +MPACK_INLINE void mpack_tree_init_file(mpack_tree_t* tree, const char* filename, size_t max_bytes) { + mpack_tree_init_filename(tree, filename, max_bytes); +} + +/** + * Initializes a tree to parse the given libc FILE. This can be used to + * read from stdin, or from a file opened separately. + * + * The tree must be destroyed with mpack_tree_destroy(), even if parsing fails. + * + * The FILE is fully loaded fully into memory (and closed if requested) before + * this call returns. + * + * @param tree The tree to initialize. + * @param stdfile The FILE. + * @param max_bytes The maximum size of file to load, or 0 for unlimited size. + * @param close_when_done If true, fclose() will be called on the FILE when it + * is no longer needed. If false, the file will not be closed when + * reading is done. + * + * @warning The tree will read all data in the FILE before parsing it. If this + * is used on stdin, the parser will block until it is closed, even if + * a complete message has been written to it! + */ +void mpack_tree_init_stdfile(mpack_tree_t* tree, FILE* stdfile, size_t max_bytes, bool close_when_done); +#endif + +/** + * @} + */ + +/** + * @name Tree Functions + * @{ + */ + +/** + * Sets the maximum byte size and maximum number of nodes allowed per message. + * + * The default is SIZE_MAX (no limit) unless @ref mpack_tree_init_stream() is + * called (where maximums are required.) + * + * If a pool of nodes is used, the node limit is the lesser of this limit and + * the pool size. + * + * @param tree The tree parser + * @param max_message_size The maximum size of a message in bytes + * @param max_message_nodes The maximum number of nodes per message. See + * @ref mpack_node_data_t for the size of nodes. + */ +void mpack_tree_set_limits(mpack_tree_t* tree, size_t max_message_size, + size_t max_message_nodes); + +/** + * Parses a MessagePack message into a tree of immutable nodes. + * + * If successful, the root node will be available under @ref mpack_tree_root(). + * If not, an appropriate error will be flagged. + * + * This can be called repeatedly to parse a series of messages from a data + * source. When this is called, all previous nodes from this tree and their + * contents (including the root node) are invalidated. + * + * If this is called with a stream (see @ref mpack_tree_init_stream()), the + * stream must block until data is available. (Otherwise, if this is called on + * a non-blocking stream, parsing will fail with @ref mpack_error_io when the + * fill function returns 0.) + * + * There is no way to recover a tree in an error state. It must be destroyed. + */ +void mpack_tree_parse(mpack_tree_t* tree); + +/** + * Attempts to parse a MessagePack message from a non-blocking stream into a + * tree of immutable nodes. + * + * A non-blocking read function must have been passed to the tree in + * mpack_tree_init_stream(). + * + * If this returns true, a message is available under + * @ref mpack_tree_root(). The tree nodes and data will be valid until + * the next time a parse is started. + * + * If this returns false, no message is available, because either not enough + * data is available yet or an error has occurred. You must check the tree for + * errors whenever this returns false. If there is no error, you should try + * again later when more data is available. (You will want to select()/poll() + * on the underlying socket or use some other asynchronous mechanism to + * determine when it has data.) + * + * There is no way to recover a tree in an error state. It must be destroyed. + * + * @see mpack_tree_init_stream() + */ +bool mpack_tree_try_parse(mpack_tree_t* tree); + +/** + * Returns the root node of the tree, if the tree is not in an error state. + * Returns a nil node otherwise. + * + * @warning You must call mpack_tree_parse() before calling this. If + * @ref mpack_tree_parse() was never called, the tree will assert. + */ +mpack_node_t mpack_tree_root(mpack_tree_t* tree); + +/** + * Returns the error state of the tree. + */ +MPACK_INLINE mpack_error_t mpack_tree_error(mpack_tree_t* tree) { + return tree->error; +} + +/** + * Returns the size in bytes of the current parsed message. + * + * If there is something in the buffer after the MessagePack object, this can + * be used to find it. + * + * This is zero if an error occurred during tree parsing (since the + * portion of the data that the first complete object occupies cannot + * be determined if the data is invalid or corrupted.) + */ +MPACK_INLINE size_t mpack_tree_size(mpack_tree_t* tree) { + return tree->size; +} + +/** + * Destroys the tree. + */ +mpack_error_t mpack_tree_destroy(mpack_tree_t* tree); + +/** + * Sets the custom pointer to pass to the tree callbacks, such as teardown. + * + * @param tree The MPack tree. + * @param context User data to pass to the tree callbacks. + * + * @see mpack_reader_context() + */ +MPACK_INLINE void mpack_tree_set_context(mpack_tree_t* tree, void* context) { + tree->context = context; +} + +/** + * Returns the custom context for tree callbacks. + * + * @see mpack_tree_set_context + * @see mpack_tree_init_stream + */ +MPACK_INLINE void* mpack_tree_context(mpack_tree_t* tree) { + return tree->context; +} + +/** + * Sets the error function to call when an error is flagged on the tree. + * + * This should normally be used with mpack_tree_set_context() to register + * a custom pointer to pass to the error function. + * + * See the definition of mpack_tree_error_t for more information about + * what you can do from an error callback. + * + * @see mpack_tree_error_t + * @param tree The MPack tree. + * @param error_fn The function to call when an error is flagged on the tree. + */ +MPACK_INLINE void mpack_tree_set_error_handler(mpack_tree_t* tree, mpack_tree_error_t error_fn) { + tree->error_fn = error_fn; +} + +/** + * Sets the teardown function to call when the tree is destroyed. + * + * This should normally be used with mpack_tree_set_context() to register + * a custom pointer to pass to the teardown function. + * + * @param tree The MPack tree. + * @param teardown The function to call when the tree is destroyed. + */ +MPACK_INLINE void mpack_tree_set_teardown(mpack_tree_t* tree, mpack_tree_teardown_t teardown) { + tree->teardown = teardown; +} + +/** + * Places the tree in the given error state, calling the error callback if one + * is set. + * + * This allows you to externally flag errors, for example if you are validating + * data as you read it. + * + * If the tree is already in an error state, this call is ignored and no + * error callback is called. + */ +void mpack_tree_flag_error(mpack_tree_t* tree, mpack_error_t error); + +/** + * @} + */ + +/** + * @name Node Core Functions + * @{ + */ + +/** + * Places the node's tree in the given error state, calling the error callback + * if one is set. + * + * This allows you to externally flag errors, for example if you are validating + * data as you read it. + * + * If the tree is already in an error state, this call is ignored and no + * error callback is called. + */ +void mpack_node_flag_error(mpack_node_t node, mpack_error_t error); + +/** + * Returns the error state of the node's tree. + */ +MPACK_INLINE mpack_error_t mpack_node_error(mpack_node_t node) { + return mpack_tree_error(node.tree); +} + +/** + * Returns a tag describing the given node, or a nil tag if the + * tree is in an error state. + */ +mpack_tag_t mpack_node_tag(mpack_node_t node); + +/** @cond */ + +#if MPACK_DEBUG && MPACK_STDIO +/* + * Converts a node to a pseudo-JSON string for debugging purposes, placing the + * result in the given buffer with a null-terminator. + * + * If the buffer does not have enough space, the result will be truncated (but + * it is guaranteed to be null-terminated.) + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_node_print_to_buffer(mpack_node_t node, char* buffer, size_t buffer_size); + +/* + * Converts a node to pseudo-JSON for debugging purposes, calling the given + * callback as many times as is necessary to output the character data. + * + * No null-terminator or trailing newline will be written. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_node_print_to_callback(mpack_node_t node, mpack_print_callback_t callback, void* context); + +/* + * Converts a node to pseudo-JSON for debugging purposes + * and pretty-prints it to the given file. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +void mpack_node_print_to_file(mpack_node_t node, FILE* file); + +/* + * Converts a node to pseudo-JSON for debugging purposes + * and pretty-prints it to stdout. + * + * This is only available in debug mode, and only if stdio is available (since + * it uses snprintf().) It's strictly for debugging purposes. + */ +MPACK_INLINE void mpack_node_print_to_stdout(mpack_node_t node) { + mpack_node_print_to_file(node, stdout); +} + +/* + * Deprecated. + * + * \deprecated Renamed to mpack_node_print_to_stdout(). + */ +MPACK_INLINE void mpack_node_print(mpack_node_t node) { + mpack_node_print_to_stdout(node); +} +#endif + +/** @endcond */ + +/** + * @} + */ + +/** + * @name Node Primitive Value Functions + * @{ + */ + +/** + * Returns the type of the node. + */ +mpack_type_t mpack_node_type(mpack_node_t node); + +/** + * Returns true if the given node is a nil node; false otherwise. + * + * To ensure that a node is nil and flag an error otherwise, use + * mpack_node_nil(). + */ +bool mpack_node_is_nil(mpack_node_t node); + +/** + * Returns true if the given node handle indicates a missing node; false otherwise. + * + * To ensure that a node is missing and flag an error otherwise, use + * mpack_node_missing(). + */ +bool mpack_node_is_missing(mpack_node_t node); + +/** + * Checks that the given node is of nil type, raising @ref mpack_error_type + * otherwise. + * + * Use mpack_node_is_nil() to return whether the node is nil. + */ +void mpack_node_nil(mpack_node_t node); + +/** + * Checks that the given node indicates a missing node, raising @ref + * mpack_error_type otherwise. + * + * Use mpack_node_is_missing() to return whether the node is missing. + */ +void mpack_node_missing(mpack_node_t node); + +/** + * Returns the bool value of the node. If this node is not of the correct + * type, false is returned and mpack_error_type is raised. + */ +bool mpack_node_bool(mpack_node_t node); + +/** + * Checks if the given node is of bool type with value true, raising + * mpack_error_type otherwise. + */ +void mpack_node_true(mpack_node_t node); + +/** + * Checks if the given node is of bool type with value false, raising + * mpack_error_type otherwise. + */ +void mpack_node_false(mpack_node_t node); + +/** + * Returns the 8-bit unsigned value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +uint8_t mpack_node_u8(mpack_node_t node); + +/** + * Returns the 8-bit signed value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +int8_t mpack_node_i8(mpack_node_t node); + +/** + * Returns the 16-bit unsigned value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +uint16_t mpack_node_u16(mpack_node_t node); + +/** + * Returns the 16-bit signed value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +int16_t mpack_node_i16(mpack_node_t node); + +/** + * Returns the 32-bit unsigned value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +uint32_t mpack_node_u32(mpack_node_t node); + +/** + * Returns the 32-bit signed value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +int32_t mpack_node_i32(mpack_node_t node); + +/** + * Returns the 64-bit unsigned value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised, and zero is returned. + */ +uint64_t mpack_node_u64(mpack_node_t node); + +/** + * Returns the 64-bit signed value of the node. If this node is not + * of a compatible type, @ref mpack_error_type is raised and zero is returned. + */ +int64_t mpack_node_i64(mpack_node_t node); + +/** + * Returns the unsigned int value of the node. + * + * Returns zero if an error occurs. + * + * @throws mpack_error_type If the node is not an integer type or does not fit in the range of an unsigned int + */ +unsigned int mpack_node_uint(mpack_node_t node); + +/** + * Returns the int value of the node. + * + * Returns zero if an error occurs. + * + * @throws mpack_error_type If the node is not an integer type or does not fit in the range of an int + */ +int mpack_node_int(mpack_node_t node); + +/** + * Returns the float value of the node. The underlying value can be an + * integer, float or double; the value is converted to a float. + * + * @note Reading a double or a large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +float mpack_node_float(mpack_node_t node); + +/** + * Returns the double value of the node. The underlying value can be an + * integer, float or double; the value is converted to a double. + * + * @note Reading a very large integer with this function can incur a + * loss of precision. + * + * @throws mpack_error_type if the underlying value is not a float, double or integer. + */ +double mpack_node_double(mpack_node_t node); + +/** + * Returns the float value of the node. The underlying value must be a float, + * not a double or an integer. This ensures no loss of precision can occur. + * + * @throws mpack_error_type if the underlying value is not a float. + */ +float mpack_node_float_strict(mpack_node_t node); + +/** + * Returns the double value of the node. The underlying value must be a float + * or double, not an integer. This ensures no loss of precision can occur. + * + * @throws mpack_error_type if the underlying value is not a float or double. + */ +double mpack_node_double_strict(mpack_node_t node); + +#if MPACK_EXTENSIONS +/** + * Returns a timestamp. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @throws mpack_error_type if the underlying value is not a timestamp. + */ +mpack_timestamp_t mpack_node_timestamp(mpack_node_t node); + +/** + * Returns a timestamp's (signed) seconds since 1970-01-01T00:00:00Z. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @throws mpack_error_type if the underlying value is not a timestamp. + */ +int64_t mpack_node_timestamp_seconds(mpack_node_t node); + +/** + * Returns a timestamp's additional nanoseconds. + * + * @note This requires @ref MPACK_EXTENSIONS. + * + * @return A nanosecond count between 0 and 999,999,999 inclusive. + * @throws mpack_error_type if the underlying value is not a timestamp. + */ +uint32_t mpack_node_timestamp_nanoseconds(mpack_node_t node); +#endif + +/** + * @} + */ + +/** + * @name Node String and Data Functions + * @{ + */ + +/** + * Checks that the given node contains a valid UTF-8 string. + * + * If the string is invalid, this flags an error, which would cause subsequent calls + * to mpack_node_str() to return NULL and mpack_node_strlen() to return zero. So you + * can check the node for error immediately after calling this, or you can call those + * functions to use the data anyway and check for errors later. + * + * @throws mpack_error_type If this node is not a string or does not contain valid UTF-8. + * + * @param node The string node to test + * + * @see mpack_node_str() + * @see mpack_node_strlen() + */ +void mpack_node_check_utf8(mpack_node_t node); + +/** + * Checks that the given node contains a valid UTF-8 string with no NUL bytes. + * + * This does not check that the string has a null-terminator! It only checks whether + * the string could safely be represented as a C-string by appending a null-terminator. + * (If the string does already contain a null-terminator, this will flag an error.) + * + * This is performed automatically by other UTF-8 cstr helper functions. Only + * call this if you will do something else with the data directly, but you still + * want to ensure it will be valid as a UTF-8 C-string. + * + * @throws mpack_error_type If this node is not a string, does not contain valid UTF-8, + * or contains a NUL byte. + * + * @param node The string node to test + * + * @see mpack_node_str() + * @see mpack_node_strlen() + * @see mpack_node_copy_utf8_cstr() + * @see mpack_node_utf8_cstr_alloc() + */ +void mpack_node_check_utf8_cstr(mpack_node_t node); + +#if MPACK_EXTENSIONS +/** + * Returns the extension type of the given ext node. + * + * This returns zero if the tree is in an error state. + * + * @note This requires @ref MPACK_EXTENSIONS. + */ +int8_t mpack_node_exttype(mpack_node_t node); +#endif + +/** + * Returns the number of bytes in the given bin node. + * + * This returns zero if the tree is in an error state. + * + * If this node is not a bin, @ref mpack_error_type is raised and zero is returned. + */ +size_t mpack_node_bin_size(mpack_node_t node); + +/** + * Returns the length of the given str, bin or ext node. + * + * This returns zero if the tree is in an error state. + * + * If this node is not a str, bin or map, @ref mpack_error_type is raised and zero + * is returned. + */ +uint32_t mpack_node_data_len(mpack_node_t node); + +/** + * Returns the length in bytes of the given string node. This does not + * include any null-terminator. + * + * This returns zero if the tree is in an error state. + * + * If this node is not a str, @ref mpack_error_type is raised and zero is returned. + */ +size_t mpack_node_strlen(mpack_node_t node); + +/** + * Returns a pointer to the data contained by this node, ensuring the node is a + * string. + * + * @warning Strings are not null-terminated! Use one of the cstr functions + * to get a null-terminated string. + * + * The pointer is valid as long as the data backing the tree is valid. + * + * If this node is not a string, @ref mpack_error_type is raised and @c NULL is returned. + * + * @see mpack_node_copy_cstr() + * @see mpack_node_cstr_alloc() + * @see mpack_node_utf8_cstr_alloc() + */ +const char* mpack_node_str(mpack_node_t node); + +/** + * Returns a pointer to the data contained by this node. + * + * @note Strings are not null-terminated! Use one of the cstr functions + * to get a null-terminated string. + * + * The pointer is valid as long as the data backing the tree is valid. + * + * If this node is not of a str, bin or map, @ref mpack_error_type is raised, and + * @c NULL is returned. + * + * @see mpack_node_copy_cstr() + * @see mpack_node_cstr_alloc() + * @see mpack_node_utf8_cstr_alloc() + */ +const char* mpack_node_data(mpack_node_t node); + +/** + * Returns a pointer to the data contained by this bin node. + * + * The pointer is valid as long as the data backing the tree is valid. + * + * If this node is not a bin, @ref mpack_error_type is raised and @c NULL is + * returned. + */ +const char* mpack_node_bin_data(mpack_node_t node); + +/** + * Copies the bytes contained by this node into the given buffer, returning the + * number of bytes in the node. + * + * @throws mpack_error_type If this node is not a str, bin or ext type + * @throws mpack_error_too_big If the string does not fit in the given buffer + * + * @param node The string node from which to copy data + * @param buffer A buffer in which to copy the node's bytes + * @param bufsize The size of the given buffer + * + * @return The number of bytes in the node, or zero if an error occurs. + */ +size_t mpack_node_copy_data(mpack_node_t node, char* buffer, size_t bufsize); + +/** + * Checks that the given node contains a valid UTF-8 string and copies the + * string into the given buffer, returning the number of bytes in the string. + * + * @throws mpack_error_type If this node is not a string + * @throws mpack_error_too_big If the string does not fit in the given buffer + * + * @param node The string node from which to copy data + * @param buffer A buffer in which to copy the node's bytes + * @param bufsize The size of the given buffer + * + * @return The number of bytes in the node, or zero if an error occurs. + */ +size_t mpack_node_copy_utf8(mpack_node_t node, char* buffer, size_t bufsize); + +/** + * Checks that the given node contains a string with no NUL bytes, copies the string + * into the given buffer, and adds a null terminator. + * + * If this node is not of a string type, @ref mpack_error_type is raised. If the string + * does not fit, @ref mpack_error_data is raised. + * + * If any error occurs, the buffer will contain an empty null-terminated string. + * + * @param node The string node from which to copy data + * @param buffer A buffer in which to copy the node's string + * @param size The size of the given buffer + */ +void mpack_node_copy_cstr(mpack_node_t node, char* buffer, size_t size); + +/** + * Checks that the given node contains a valid UTF-8 string with no NUL bytes, + * copies the string into the given buffer, and adds a null terminator. + * + * If this node is not of a string type, @ref mpack_error_type is raised. If the string + * does not fit, @ref mpack_error_data is raised. + * + * If any error occurs, the buffer will contain an empty null-terminated string. + * + * @param node The string node from which to copy data + * @param buffer A buffer in which to copy the node's string + * @param size The size of the given buffer + */ +void mpack_node_copy_utf8_cstr(mpack_node_t node, char* buffer, size_t size); + +#ifdef MPACK_MALLOC +/** + * Allocates a new chunk of data using MPACK_MALLOC() with the bytes + * contained by this node. + * + * The allocated data must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_type If this node is not a str, bin or ext type + * @throws mpack_error_too_big If the size of the data is larger than the + * given maximum size + * @throws mpack_error_memory If an allocation failure occurs + * + * @param node The node from which to allocate and copy data + * @param maxsize The maximum size to allocate + * + * @return The allocated data, or NULL if any error occurs. + */ +char* mpack_node_data_alloc(mpack_node_t node, size_t maxsize); + +/** + * Allocates a new null-terminated string using MPACK_MALLOC() with the string + * contained by this node. + * + * The allocated string must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_type If this node is not a string or contains NUL bytes + * @throws mpack_error_too_big If the size of the string plus null-terminator + * is larger than the given maximum size + * @throws mpack_error_memory If an allocation failure occurs + * + * @param node The node from which to allocate and copy string data + * @param maxsize The maximum size to allocate, including the null-terminator + * + * @return The allocated string, or NULL if any error occurs. + */ +char* mpack_node_cstr_alloc(mpack_node_t node, size_t maxsize); + +/** + * Allocates a new null-terminated string using MPACK_MALLOC() with the UTF-8 + * string contained by this node. + * + * The allocated string must be freed with MPACK_FREE() (or simply free() + * if MPack's allocator hasn't been customized.) + * + * @throws mpack_error_type If this node is not a string, is not valid UTF-8, + * or contains NUL bytes + * @throws mpack_error_too_big If the size of the string plus null-terminator + * is larger than the given maximum size + * @throws mpack_error_memory If an allocation failure occurs + * + * @param node The node from which to allocate and copy string data + * @param maxsize The maximum size to allocate, including the null-terminator + * + * @return The allocated string, or NULL if any error occurs. + */ +char* mpack_node_utf8_cstr_alloc(mpack_node_t node, size_t maxsize); +#endif + +/** + * Searches the given string array for a string matching the given + * node and returns its index. + * + * If the node does not match any of the given strings, + * @ref mpack_error_type is flagged. Use mpack_node_enum_optional() + * if you want to allow values other than the given strings. + * + * If any error occurs or if the tree is in an error state, @a count + * is returned. + * + * This can be used to quickly parse a string into an enum when the + * enum values range from 0 to @a count-1. If the last value in the + * enum is a special "count" value, it can be passed as the count, + * and the return value can be cast directly to the enum type. + * + * @code{.c} + * typedef enum { APPLE , BANANA , ORANGE , COUNT} fruit_t; + * const char* fruits[] = {"apple", "banana", "orange"}; + * + * fruit_t fruit = (fruit_t)mpack_node_enum(node, fruits, COUNT); + * @endcode + * + * @param node The node + * @param strings An array of expected strings of length count + * @param count The number of strings + * @return The index of the matched string, or @a count in case of error + */ +size_t mpack_node_enum(mpack_node_t node, const char* strings[], size_t count); + +/** + * Searches the given string array for a string matching the given node, + * returning its index or @a count if no strings match. + * + * If the value is not a string, or it does not match any of the + * given strings, @a count is returned and no error is flagged. + * + * If any error occurs or if the tree is in an error state, @a count + * is returned. + * + * This can be used to quickly parse a string into an enum when the + * enum values range from 0 to @a count-1. If the last value in the + * enum is a special "count" value, it can be passed as the count, + * and the return value can be cast directly to the enum type. + * + * @code{.c} + * typedef enum { APPLE , BANANA , ORANGE , COUNT} fruit_t; + * const char* fruits[] = {"apple", "banana", "orange"}; + * + * fruit_t fruit = (fruit_t)mpack_node_enum_optional(node, fruits, COUNT); + * @endcode + * + * @param node The node + * @param strings An array of expected strings of length count + * @param count The number of strings + * @return The index of the matched string, or @a count in case of error + */ +size_t mpack_node_enum_optional(mpack_node_t node, const char* strings[], size_t count); + +/** + * @} + */ + +/** + * @name Compound Node Functions + * @{ + */ + +/** + * Returns the length of the given array node. Raises mpack_error_type + * and returns 0 if the given node is not an array. + */ +size_t mpack_node_array_length(mpack_node_t node); + +/** + * Returns the node in the given array at the given index. If the node + * is not an array, @ref mpack_error_type is raised and a nil node is returned. + * If the given index is out of bounds, @ref mpack_error_data is raised and + * a nil node is returned. + */ +mpack_node_t mpack_node_array_at(mpack_node_t node, size_t index); + +/** + * Returns the number of key/value pairs in the given map node. Raises + * mpack_error_type and returns 0 if the given node is not a map. + */ +size_t mpack_node_map_count(mpack_node_t node); + +/** + * Returns the key node in the given map at the given index. + * + * A nil node is returned in case of error. + * + * @throws mpack_error_type if the node is not a map + * @throws mpack_error_data if the given index is out of bounds + */ +mpack_node_t mpack_node_map_key_at(mpack_node_t node, size_t index); + +/** + * Returns the value node in the given map at the given index. + * + * A nil node is returned in case of error. + * + * @throws mpack_error_type if the node is not a map + * @throws mpack_error_data if the given index is out of bounds + */ +mpack_node_t mpack_node_map_value_at(mpack_node_t node, size_t index); + +/** + * Returns the value node in the given map for the given integer key. + * + * The key must exist within the map. Use mpack_node_map_int_optional() to + * check for optional keys. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node does not contain exactly one entry with the given key + * + * @return The value node for the given key, or a nil node in case of error + */ +mpack_node_t mpack_node_map_int(mpack_node_t node, int64_t num); + +/** + * Returns the value node in the given map for the given integer key, or a + * missing node if the map does not contain the given key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + * + * @return The value node for the given key, or a missing node if the key does + * not exist, or a nil node in case of error + * + * @see mpack_node_is_missing() + */ +mpack_node_t mpack_node_map_int_optional(mpack_node_t node, int64_t num); + +/** + * Returns the value node in the given map for the given unsigned integer key. + * + * The key must exist within the map. Use mpack_node_map_uint_optional() to + * check for optional keys. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node does not contain exactly one entry with the given key + * + * @return The value node for the given key, or a nil node in case of error + */ +mpack_node_t mpack_node_map_uint(mpack_node_t node, uint64_t num); + +/** + * Returns the value node in the given map for the given unsigned integer + * key, or a nil node if the map does not contain the given key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + * + * @return The value node for the given key, or a missing node if the key does + * not exist, or a nil node in case of error + * + * @see mpack_node_is_missing() + */ +mpack_node_t mpack_node_map_uint_optional(mpack_node_t node, uint64_t num); + +/** + * Returns the value node in the given map for the given string key. + * + * The key must exist within the map. Use mpack_node_map_str_optional() to + * check for optional keys. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node does not contain exactly one entry with the given key + * + * @return The value node for the given key, or a nil node in case of error + */ +mpack_node_t mpack_node_map_str(mpack_node_t node, const char* str, size_t length); + +/** + * Returns the value node in the given map for the given string key, or a nil + * node if the map does not contain the given key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + * + * @return The value node for the given key, or a missing node if the key does + * not exist, or a nil node in case of error + * + * @see mpack_node_is_missing() + */ +mpack_node_t mpack_node_map_str_optional(mpack_node_t node, const char* str, size_t length); + +/** + * Returns the value node in the given map for the given null-terminated + * string key. + * + * The key must exist within the map. Use mpack_node_map_cstr_optional() to + * check for optional keys. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node does not contain exactly one entry with the given key + * + * @return The value node for the given key, or a nil node in case of error + */ +mpack_node_t mpack_node_map_cstr(mpack_node_t node, const char* cstr); + +/** + * Returns the value node in the given map for the given null-terminated + * string key, or a nil node if the map does not contain the given key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + * + * @return The value node for the given key, or a missing node if the key does + * not exist, or a nil node in case of error + * + * @see mpack_node_is_missing() + */ +mpack_node_t mpack_node_map_cstr_optional(mpack_node_t node, const char* cstr); + +/** + * Returns true if the given node map contains exactly one entry with the + * given integer key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + */ +bool mpack_node_map_contains_int(mpack_node_t node, int64_t num); + +/** + * Returns true if the given node map contains exactly one entry with the + * given unsigned integer key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + */ +bool mpack_node_map_contains_uint(mpack_node_t node, uint64_t num); + +/** + * Returns true if the given node map contains exactly one entry with the + * given string key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + */ +bool mpack_node_map_contains_str(mpack_node_t node, const char* str, size_t length); + +/** + * Returns true if the given node map contains exactly one entry with the + * given null-terminated string key. + * + * The key must be unique. An error is flagged if the node has multiple + * entries with the given key. + * + * @throws mpack_error_type If the node is not a map + * @throws mpack_error_data If the node contains more than one entry with the given key + */ +bool mpack_node_map_contains_cstr(mpack_node_t node, const char* cstr); + +/** + * @} + */ + +/** + * @} + */ + +#endif + +MPACK_HEADER_END + +#endif + + +#endif + |