Merge commit '3b4feac1ec14f861bdd7f494f288f4d8dd7f449e'

* commit '3b4feac1ec14f861bdd7f494f288f4d8dd7f449e':
  movenc: Keep track of the allocated size for the cluster array
  mem: Add av_realloc_array and av_reallocp_array

Conflicts:
	doc/APIchanges
	libavformat/movenc.c
	libavutil/mem.c
	libavutil/mem.h
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

3 files changed, 53 insertions, 1 deletions

diff --git a/libavutil/mem.c b/libavutil/mem.c
index 66502eb467..1f2b0c3dd3 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -180,6 +180,32 @@ void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)
     return r;
 }
 
+void *av_realloc_array(void *ptr, size_t nmemb, size_t size)
+{
+    if (size <= 0 || nmemb >= INT_MAX / size)
+        return NULL;
+    return av_realloc(ptr, nmemb * size);
+}
+
+int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
+{
+    void **ptrptr = ptr;
+    void *ret;
+    if (size <= 0 || nmemb >= INT_MAX / size)
+        return AVERROR(ENOMEM);
+    if (nmemb <= 0) {
+        av_freep(ptr);
+        return 0;
+    }
+    ret = av_realloc(*ptrptr, nmemb * size);
+    if (!ret) {
+        av_freep(ptr);
+        return AVERROR(ENOMEM);
+    }
+    *ptrptr = ret;
+    return 0;
+}
+
 void av_free(void *ptr)
 {
 #if CONFIG_MEMALIGN_HACK
diff --git a/libavutil/mem.h b/libavutil/mem.h
index a3294690cf..fb23a69094 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -123,6 +123,32 @@ void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
 void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
 
 /**
+ * Allocate or reallocate an array.
+ * If ptr is NULL and nmemb > 0, allocate a new block. If
+ * nmemb is zero, free the memory block pointed to by ptr.
+ * @param ptr Pointer to a memory block already allocated with
+ * av_malloc(z)() or av_realloc() or NULL.
+ * @param nmemb Number of elements
+ * @param size Size of the single element
+ * @return Pointer to a newly reallocated block or NULL if the block
+ * cannot be reallocated or the function is used to free the memory block.
+ */
+av_alloc_size(2, 3) void *av_realloc_array(void *ptr, size_t nmemb, size_t size);
+
+/**
+ * Allocate or reallocate an array.
+ * If *ptr is NULL and nmemb > 0, allocate a new block. If
+ * nmemb is zero, free the memory block pointed to by ptr.
+ * @param ptr Pointer to a pointer to a memory block already allocated
+ * with av_malloc(z)() or av_realloc(), or pointer to a pointer to NULL.
+ * The pointer is updated on success, or freed on failure.
+ * @param nmemb Number of elements
+ * @param size Size of the single element
+ * @return Zero on success, an AVERROR error code on failure.
+ */
+av_alloc_size(2, 3) int av_reallocp_array(void *ptr, size_t nmemb, size_t size);
+
+/**
  * Free a memory block which has been allocated with av_malloc(z)() or
  * av_realloc().
  * @param ptr Pointer to the memory block which should be freed.
diff --git a/libavutil/version.h b/libavutil/version.h
index e234296b41..9941229bbc 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -75,7 +75,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  34
+#define LIBAVUTIL_VERSION_MINOR  35
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \