1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include "aom_mem.h"
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include "include/aom_mem_intrnl.h"
17 #include "aom/aom_integer.h"
18
19 #if defined(AOM_MAX_ALLOCABLE_MEMORY)
20 // Returns 0 in case of overflow of nmemb * size.
check_size_argument_overflow(uint64_t nmemb,uint64_t size)21 static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
22 const uint64_t total_size = nmemb * size;
23 if (nmemb == 0) return 1;
24 if (size > AOM_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
25 if (total_size != (size_t)total_size) return 0;
26 return 1;
27 }
28 #endif
29
GetAlignedMallocSize(size_t size,size_t align)30 static size_t GetAlignedMallocSize(size_t size, size_t align) {
31 return size + align - 1 + ADDRESS_STORAGE_SIZE;
32 }
33
GetMallocAddressLocation(void * const mem)34 static size_t *GetMallocAddressLocation(void *const mem) {
35 return ((size_t *)mem) - 1;
36 }
37
SetActualMallocAddress(void * const mem,const void * const malloc_addr)38 static void SetActualMallocAddress(void *const mem,
39 const void *const malloc_addr) {
40 size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
41 *malloc_addr_location = (size_t)malloc_addr;
42 }
43
GetActualMallocAddress(void * const mem)44 static void *GetActualMallocAddress(void *const mem) {
45 const size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
46 return (void *)(*malloc_addr_location);
47 }
48
aom_memalign(size_t align,size_t size)49 void *aom_memalign(size_t align, size_t size) {
50 void *x = NULL;
51 const size_t aligned_size = GetAlignedMallocSize(size, align);
52 #if defined(AOM_MAX_ALLOCABLE_MEMORY)
53 if (!check_size_argument_overflow(1, aligned_size)) return NULL;
54 #endif
55 void *const addr = malloc(aligned_size);
56 if (addr) {
57 x = aom_align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
58 SetActualMallocAddress(x, addr);
59 }
60 return x;
61 }
62
aom_malloc(size_t size)63 void *aom_malloc(size_t size) { return aom_memalign(DEFAULT_ALIGNMENT, size); }
64
aom_calloc(size_t num,size_t size)65 void *aom_calloc(size_t num, size_t size) {
66 const size_t total_size = num * size;
67 void *const x = aom_malloc(total_size);
68 if (x) memset(x, 0, total_size);
69 return x;
70 }
71
aom_free(void * memblk)72 void aom_free(void *memblk) {
73 if (memblk) {
74 void *addr = GetActualMallocAddress(memblk);
75 free(addr);
76 }
77 }
78
aom_memset16(void * dest,int val,size_t length)79 void *aom_memset16(void *dest, int val, size_t length) {
80 size_t i;
81 uint16_t *dest16 = (uint16_t *)dest;
82 for (i = 0; i < length; i++) *dest16++ = val;
83 return dest;
84 }
85