Line data    Source code

       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           0 : static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
      28           0 :   const uint64_t total_size = nmemb * size;
      29           0 :   if (nmemb == 0) return 1;
      30           0 :   if (size > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
      31             :   if (total_size != (size_t)total_size) return 0;
      32             : 
      33           0 :   return 1;
      34             : }
      35             : 
      36           0 : static size_t *get_malloc_address_location(void *const mem) {
      37           0 :   return ((size_t *)mem) - 1;
      38             : }
      39             : 
      40           0 : static uint64_t get_aligned_malloc_size(size_t size, size_t align) {
      41           0 :   return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE;
      42             : }
      43             : 
      44           0 : static void set_actual_malloc_address(void *const mem,
      45             :                                       const void *const malloc_addr) {
      46           0 :   size_t *const malloc_addr_location = get_malloc_address_location(mem);
      47           0 :   *malloc_addr_location = (size_t)malloc_addr;
      48           0 : }
      49             : 
      50           0 : static void *get_actual_malloc_address(void *const mem) {
      51           0 :   size_t *const malloc_addr_location = get_malloc_address_location(mem);
      52           0 :   return (void *)(*malloc_addr_location);
      53             : }
      54             : 
      55           0 : void *vpx_memalign(size_t align, size_t size) {
      56           0 :   void *x = NULL, *addr;
      57           0 :   const uint64_t aligned_size = get_aligned_malloc_size(size, align);
      58           0 :   if (!check_size_argument_overflow(1, aligned_size)) return NULL;
      59             : 
      60           0 :   addr = malloc((size_t)aligned_size);
      61           0 :   if (addr) {
      62           0 :     x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
      63           0 :     set_actual_malloc_address(x, addr);
      64             :   }
      65           0 :   return x;
      66             : }
      67             : 
      68           0 : void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); }
      69             : 
      70           0 : void *vpx_calloc(size_t num, size_t size) {
      71             :   void *x;
      72           0 :   if (!check_size_argument_overflow(num, size)) return NULL;
      73             : 
      74           0 :   x = vpx_malloc(num * size);
      75           0 :   if (x) memset(x, 0, num * size);
      76           0 :   return x;
      77             : }
      78             : 
      79           0 : void vpx_free(void *memblk) {
      80           0 :   if (memblk) {
      81           0 :     void *addr = get_actual_malloc_address(memblk);
      82           0 :     free(addr);
      83             :   }
      84           0 : }
      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