#define AVUTIL_MEM_H
#include "attributes.h"
+#include "error.h"
#include "avutil.h"
#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
*/
void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
+/**
+ * Allocate or reallocate a block of memory.
+ * This function does the same thing as av_realloc, except:
+ * - It takes two arguments and checks the result of the multiplication for
+ * integer overflow.
+ * - It frees the input block in case of failure, thus avoiding the memory
+ * leak with the classic "buf = realloc(buf); if (!buf) return -1;".
+ */
+void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
+
/**
* Free a memory block which has been allocated with av_malloc(z)() or
* av_realloc().
*/
void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem);
+/**
+ * Multiply two size_t values checking for overflow.
+ * @return 0 if success, AVERROR(EINVAL) if overflow.
+ */
+static inline int av_size_mult(size_t a, size_t b, size_t *r)
+{
+ size_t t = a * b;
+ /* Hack inspired from glibc: only try the division if nelem and elsize
+ * are both greater than sqrt(SIZE_MAX). */
+ if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
+ return AVERROR(EINVAL);
+ *r = t;
+ return 0;
+}
+
#endif /* AVUTIL_MEM_H */