1// Copyright 2012 Google Inc. All Rights Reserved.
2//
3// This code is licensed under the same terms as WebM:
4//  Software License Agreement:  http://www.webmproject.org/license/software/
5//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
6// -----------------------------------------------------------------------------
7//
8// Misc. common utility functions
9//
10// Author: Skal (pascal.massimino@gmail.com)
11
12#include <stdlib.h>
13#include "./utils.h"
14
15#if defined(__cplusplus) || defined(c_plusplus)
16extern "C" {
17#endif
18
19//------------------------------------------------------------------------------
20// Checked memory allocation
21
22// Returns 0 in case of overflow of nmemb * size.
23static int CheckSizeArgumentsOverflow(uint64_t nmemb, size_t size) {
24  const uint64_t total_size = nmemb * size;
25  if (nmemb == 0) return 1;
26  if ((uint64_t)size > WEBP_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
27  if (total_size != (size_t)total_size) return 0;
28  return 1;
29}
30
31void* WebPSafeMalloc(uint64_t nmemb, size_t size) {
32  if (!CheckSizeArgumentsOverflow(nmemb, size)) return NULL;
33  assert(nmemb * size > 0);
34  return malloc((size_t)(nmemb * size));
35}
36
37void* WebPSafeCalloc(uint64_t nmemb, size_t size) {
38  if (!CheckSizeArgumentsOverflow(nmemb, size)) return NULL;
39  assert(nmemb * size > 0);
40  return calloc((size_t)nmemb, size);
41}
42
43//------------------------------------------------------------------------------
44
45#if defined(__cplusplus) || defined(c_plusplus)
46}    // extern "C"
47#endif
48