82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include "aom_mem.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "include/aom_mem_intrnl.h"
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#include "aom/aom_integer.h"
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static size_t GetAllocationPaddingSize(size_t align) {
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assert(align > 0);
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assert(align < SIZE_MAX - ADDRESS_STORAGE_SIZE);
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return align - 1 + ADDRESS_STORAGE_SIZE;
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}
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// Returns 0 in case of overflow of nmemb * size.
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static int check_size_argument_overflow(size_t nmemb, size_t size,
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size_t align) {
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if (nmemb == 0) return 1;
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const size_t alloc_padding = GetAllocationPaddingSize(align);
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#if defined(AOM_MAX_ALLOCABLE_MEMORY)
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assert(AOM_MAX_ALLOCABLE_MEMORY >= alloc_padding);
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assert(AOM_MAX_ALLOCABLE_MEMORY <= SIZE_MAX);
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if (size > (AOM_MAX_ALLOCABLE_MEMORY - alloc_padding) / nmemb) return 0;
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#else
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if (size > (SIZE_MAX - alloc_padding) / nmemb) return 0;
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#endif
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return 1;
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}
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static size_t *GetMallocAddressLocation(void *const mem) {
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return ((size_t *)mem) - 1;
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}
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static void SetActualMallocAddress(void *const mem,
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const void *const malloc_addr) {
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size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
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*malloc_addr_location = (size_t)malloc_addr;
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}
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static void *GetActualMallocAddress(void *const mem) {
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const size_t *const malloc_addr_location = GetMallocAddressLocation(mem);
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return (void *)(*malloc_addr_location);
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}
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void *aom_memalign(size_t align, size_t size) {
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void *x = NULL;
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if (!check_size_argument_overflow(1, size, align)) return NULL;
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const size_t aligned_size = size + GetAllocationPaddingSize(align);
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void *const addr = malloc(aligned_size);
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if (addr) {
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x = aom_align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
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SetActualMallocAddress(x, addr);
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}
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return x;
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}
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void *aom_malloc(size_t size) { return aom_memalign(DEFAULT_ALIGNMENT, size); }
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void *aom_calloc(size_t num, size_t size) {
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if (!check_size_argument_overflow(num, size, DEFAULT_ALIGNMENT)) return NULL;
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const size_t total_size = num * size;
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void *const x = aom_malloc(total_size);
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if (x) memset(x, 0, total_size);
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return x;
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}
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void aom_free(void *memblk) {
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if (memblk) {
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void *addr = GetActualMallocAddress(memblk);
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free(addr);
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}
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}
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