1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 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. 9 */ 10 11 #include "vpx_mem.h" 12 #include <limits.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include "include/vpx_mem_intrnl.h" 17 #include "vpx/vpx_integer.h" 18 19 #if SIZE_MAX > (1ULL << 40) 20 #define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40) 21 #else 22 // For 32-bit targets keep this below INT_MAX to avoid valgrind warnings. 23 #define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16)) 24 #endif 25 26 // Returns 0 in case of overflow of nmemb * size. 27 static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) { 28 const uint64_t total_size = nmemb * size; 29 if (nmemb == 0) return 1; 30 if (size > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0; 31 if (total_size != (size_t)total_size) return 0; 32 33 return 1; 34 } 35 36 static size_t *get_malloc_address_location(void *const mem) { 37 return ((size_t *)mem) - 1; 38 } 39 40 static uint64_t get_aligned_malloc_size(size_t size, size_t align) { 41 return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE; 42 } 43 44 static void set_actual_malloc_address(void *const mem, 45 const void *const malloc_addr) { 46 size_t *const malloc_addr_location = get_malloc_address_location(mem); 47 *malloc_addr_location = (size_t)malloc_addr; 48 } 49 50 static void *get_actual_malloc_address(void *const mem) { 51 size_t *const malloc_addr_location = get_malloc_address_location(mem); 52 return (void *)(*malloc_addr_location); 53 } 54 55 void *vpx_memalign(size_t align, size_t size) { 56 void *x = NULL, *addr; 57 const uint64_t aligned_size = get_aligned_malloc_size(size, align); 58 if (!check_size_argument_overflow(1, aligned_size)) return NULL; 59 60 addr = malloc((size_t)aligned_size); 61 if (addr) { 62 x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align); 63 set_actual_malloc_address(x, addr); 64 } 65 return x; 66 } 67 68 void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); } 69 70 void *vpx_calloc(size_t num, size_t size) { 71 void *x; 72 if (!check_size_argument_overflow(num, size)) return NULL; 73 74 x = vpx_malloc(num * size); 75 if (x) memset(x, 0, num * size); 76 return x; 77 } 78 79 void vpx_free(void *memblk) { 80 if (memblk) { 81 void *addr = get_actual_malloc_address(memblk); 82 free(addr); 83 } 84 } 85 86 #if CONFIG_VP9_HIGHBITDEPTH 87 void *vpx_memset16(void *dest, int val, size_t length) { 88 size_t i; 89 uint16_t *dest16 = (uint16_t *)dest; 90 for (i = 0; i < length; i++) *dest16++ = val; 91 return dest; 92 } 93 #endif // CONFIG_VP9_HIGHBITDEPTH 94
