diff -ru libzip-0.10.orig/lib/zip_fclose.c libzip-0.10/lib/zip_fclose.c
--- libzip-0.10.orig/lib/zip_fclose.c	2010-03-08 13:27:48.000000000 +0100
+++ libzip-0.10/lib/zip_fclose.c	2011-07-03 11:07:22.000000000 +0200
@@ -47,7 +47,7 @@
     if (zf->src)
 	zip_source_free(zf->src);
 
-    for (i=0; i<zf->za->nfile; i++) {
+    if (zf->za) for (i=0; i<zf->za->nfile; i++) {
 	if (zf->za->file[i] == zf) {
 	    zf->za->file[i] = zf->za->file[zf->za->nfile-1];
 	    zf->za->nfile--;
Seulement dans libzip-0.10/lib: zip_fclose.c~
diff -ru libzip-0.10.orig/lib/zip.h libzip-0.10/lib/zip.h
--- libzip-0.10.orig/lib/zip.h	2011-03-04 18:17:43.000000000 +0100
+++ libzip-0.10/lib/zip.h	2011-07-03 11:38:39.000000000 +0200
@@ -59,6 +59,7 @@
 #define ZIP_CREATE           1
 #define ZIP_EXCL             2
 #define ZIP_CHECKCONS        4
+#define ZIP_OVERWRITE        8
 
 
 /* flags for zip_name_locate, zip_fopen, zip_stat, ... */
Seulement dans libzip-0.10/lib: zip.h~
diff -ru libzip-0.10.orig/lib/zip_name_locate.c libzip-0.10/lib/zip_name_locate.c
--- libzip-0.10.orig/lib/zip_name_locate.c	2011-02-13 16:06:21.000000000 +0100
+++ libzip-0.10/lib/zip_name_locate.c	2011-07-03 14:24:44.000000000 +0200
@@ -91,6 +91,7 @@
 	    return i;
     }
 
-    _zip_error_set(error, ZIP_ER_NOENT, 0);
+/* Look for an entry should not raise an error  */
+/*    _zip_error_set(error, ZIP_ER_NOENT, 0);*/
     return -1;
 }
Seulement dans libzip-0.10/lib: zip_name_locate.c~
diff -ru libzip-0.10.orig/lib/zip_open.c libzip-0.10/lib/zip_open.c
--- libzip-0.10.orig/lib/zip_open.c	2011-03-16 12:18:44.000000000 +0100
+++ libzip-0.10/lib/zip_open.c	2011-07-03 11:19:41.000000000 +0200
@@ -62,9 +62,15 @@
 {
     FILE *fp;
     
+    if (flags & ZIP_OVERWRITE) {
+	return _zip_allocate_new(fn, zep);
+    }
+
     switch (_zip_file_exists(fn, flags, zep)) {
     case -1:
-	return NULL;
+	if (!(flags & ZIP_OVERWRITE)) {
+		return NULL;
+	}
     case 0:
 	return _zip_allocate_new(fn, zep);
     default:
@@ -482,7 +488,7 @@
     }
     
     if (stat(fn, &st) != 0) {
-	if (flags & ZIP_CREATE)
+	if (flags & ZIP_CREATE || flags & ZIP_OVERWRITE)
 	    return 0;
 	else {
 	    set_error(zep, NULL, ZIP_ER_OPEN);
Seulement dans libzip-0.10/lib: zip_open.c~