85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vpx_mem.h"
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "include/vpx_mem_intrnl.h"
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#include "vpx/vpx_integer.h"
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#if SIZE_MAX > (1ULL << 40)
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#define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40)
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#else
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// For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.
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#define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))
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#endif
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// Returns 0 in case of overflow of nmemb * size.
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static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
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const uint64_t total_size = nmemb * size;
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if (nmemb == 0) return 1;
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if (size > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
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if (total_size != (size_t)total_size) return 0;
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return 1;
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}
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static size_t *get_malloc_address_location(void *const mem) {
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return ((size_t *)mem) - 1;
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}
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static uint64_t get_aligned_malloc_size(size_t size, size_t align) {
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return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE;
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}
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static void set_actual_malloc_address(void *const mem,
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const void *const malloc_addr) {
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size_t *const malloc_addr_location = get_malloc_address_location(mem);
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*malloc_addr_location = (size_t)malloc_addr;
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}
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static void *get_actual_malloc_address(void *const mem) {
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size_t *const malloc_addr_location = get_malloc_address_location(mem);
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return (void *)(*malloc_addr_location);
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}
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void *vpx_memalign(size_t align, size_t size) {
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void *x = NULL, *addr;
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const uint64_t aligned_size = get_aligned_malloc_size(size, align);
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if (!check_size_argument_overflow(1, aligned_size)) return NULL;
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addr = malloc((size_t)aligned_size);
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if (addr) {
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x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
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set_actual_malloc_address(x, addr);
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}
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return x;
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}
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void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); }
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void *vpx_calloc(size_t num, size_t size) {
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void *x;
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if (!check_size_argument_overflow(num, size)) return NULL;
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x = vpx_malloc(num * size);
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if (x) memset(x, 0, num * size);
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return x;
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}
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void vpx_free(void *memblk) {
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if (memblk) {
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void *addr = get_actual_malloc_address(memblk);
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free(addr);
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}
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}
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