2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
16 #include "include/vpx_mem_intrnl.h"
17 #include "vpx/vpx_integer.h"
19 #if !defined(VPX_MAX_ALLOCABLE_MEMORY)
20 #if SIZE_MAX > (1ULL << 40)
21 #define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40)
23 // For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.
24 #define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))
28 // Returns 0 in case of overflow of nmemb * size.
29 static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
30 const uint64_t total_size = nmemb * size;
31 if (nmemb == 0) return 1;
32 if (size > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
33 if (total_size != (size_t)total_size) return 0;
38 static size_t *get_malloc_address_location(void *const mem) {
39 return ((size_t *)mem) - 1;
42 static uint64_t get_aligned_malloc_size(size_t size, size_t align) {
43 return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE;
46 static void set_actual_malloc_address(void *const mem,
47 const void *const malloc_addr) {
48 size_t *const malloc_addr_location = get_malloc_address_location(mem);
49 *malloc_addr_location = (size_t)malloc_addr;
52 static void *get_actual_malloc_address(void *const mem) {
53 size_t *const malloc_addr_location = get_malloc_address_location(mem);
54 return (void *)(*malloc_addr_location);
57 void *vpx_memalign(size_t align, size_t size) {
58 void *x = NULL, *addr;
59 const uint64_t aligned_size = get_aligned_malloc_size(size, align);
60 if (!check_size_argument_overflow(1, aligned_size)) return NULL;
62 addr = malloc((size_t)aligned_size);
64 x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
65 set_actual_malloc_address(x, addr);
70 void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); }
72 void *vpx_calloc(size_t num, size_t size) {
74 if (!check_size_argument_overflow(num, size)) return NULL;
76 x = vpx_malloc(num * size);
77 if (x) memset(x, 0, num * size);
81 void vpx_free(void *memblk) {
83 void *addr = get_actual_malloc_address(memblk);