1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "vpx_mem.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "include/vpx_mem_intrnl.h"
#include "vpx/vpx_integer.h"
#if !defined(VPX_MAX_ALLOCABLE_MEMORY)
#if SIZE_MAX > (1ULL << 40)
#define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40)
#else
// For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.
#define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))
#endif
#endif
// Returns 0 in case of overflow of nmemb * size.
static int check_size_argument_overflow(uint64_t nmemb, uint64_t size) {
const uint64_t total_size = nmemb * size;
if (nmemb == 0) return 1;
if (size > VPX_MAX_ALLOCABLE_MEMORY / nmemb) return 0;
if (total_size != (size_t)total_size) return 0;
return 1;
}
static size_t *get_malloc_address_location(void *const mem) {
return ((size_t *)mem) - 1;
}
static uint64_t get_aligned_malloc_size(size_t size, size_t align) {
return (uint64_t)size + align - 1 + ADDRESS_STORAGE_SIZE;
}
static void set_actual_malloc_address(void *const mem,
const void *const malloc_addr) {
size_t *const malloc_addr_location = get_malloc_address_location(mem);
*malloc_addr_location = (size_t)malloc_addr;
}
static void *get_actual_malloc_address(void *const mem) {
size_t *const malloc_addr_location = get_malloc_address_location(mem);
return (void *)(*malloc_addr_location);
}
void *vpx_memalign(size_t align, size_t size) {
void *x = NULL, *addr;
const uint64_t aligned_size = get_aligned_malloc_size(size, align);
if (!check_size_argument_overflow(1, aligned_size)) return NULL;
addr = malloc((size_t)aligned_size);
if (addr) {
x = align_addr((unsigned char *)addr + ADDRESS_STORAGE_SIZE, align);
set_actual_malloc_address(x, addr);
}
return x;
}
void *vpx_malloc(size_t size) { return vpx_memalign(DEFAULT_ALIGNMENT, size); }
void *vpx_calloc(size_t num, size_t size) {
void *x;
if (!check_size_argument_overflow(num, size)) return NULL;
x = vpx_malloc(num * size);
if (x) memset(x, 0, num * size);
return x;
}
void vpx_free(void *memblk) {
if (memblk) {
void *addr = get_actual_malloc_address(memblk);
free(addr);
}
}
|
