mirror of
https://github.com/google/brotli.git
synced 2024-12-01 23:40:05 +00:00
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/* Copyright 2013 Google Inc. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/* Size-checked memory allocation. */
|
|
|
|
#include <stdlib.h>
|
|
#include "./port.h"
|
|
#include "./safe_malloc.h"
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Returns 0 in case of overflow of nmemb * size. */
|
|
static int CheckSizeArgumentsOverflow(uint64_t nmemb, size_t size) {
|
|
const uint64_t total_size = nmemb * size;
|
|
if (nmemb == 0) return 1;
|
|
if ((nmemb | size) >> 31) {
|
|
return 0;
|
|
}
|
|
if (((size * nmemb) >> BROTLI_MAX_ALLOCABLE_MEMORY_BITS) != 0) return 0;
|
|
if (total_size != (size_t)total_size) return 0;
|
|
return 1;
|
|
}
|
|
|
|
void* BrotliSafeMalloc(uint64_t nmemb, size_t size) {
|
|
if (!CheckSizeArgumentsOverflow(nmemb, size)) return NULL;
|
|
BROTLI_DCHECK(nmemb * size > 0);
|
|
return malloc((size_t)(nmemb * size));
|
|
}
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} /* extern "C" */
|
|
#endif
|