third_party/brotli/dec/safe_malloc.h

   1 /* Copyright 2013 Google Inc. All Rights Reserved.
   2
   3    Licensed under the Apache License, Version 2.0 (the "License");
   4    you may not use this file except in compliance with the License.
   5    You may obtain a copy of the License at
   6
   7    http://www.apache.org/licenses/LICENSE-2.0
   8
   9    Unless required by applicable law or agreed to in writing, software
  10    distributed under the License is distributed on an "AS IS" BASIS,
  11    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    See the License for the specific language governing permissions and
  13    limitations under the License.
  14
  15    Size-checked memory allocation.
  16 */
  17
  18 #ifndef BROTLI_DEC_SAFE_MALLOC_H_
  19 #define BROTLI_DEC_SAFE_MALLOC_H_
  20
  21 #include <assert.h>
  22
  23 #include "./types.h"
  24
  25 #if defined(__cplusplus) || defined(c_plusplus)
  26 extern "C" {
  27 #endif
  28
  29 /* This is the maximum memory amount that we will ever try to allocate. */
  30 #define BROTLI_MAX_ALLOCABLE_MEMORY (1 << 30)
  31
  32 /* size-checking safe malloc/calloc: verify that the requested size is not too
  33    large, or return NULL. You don't need to call these for constructs like
  34    malloc(sizeof(foo)), but only if there's font-dependent size involved
  35    somewhere (like: malloc(decoded_size * sizeof(*something))). That's why this
  36    safe malloc() borrows the signature from calloc(), pointing at the dangerous
  37    underlying multiply involved.
  38 */
  39 void* BrotliSafeMalloc(uint64_t nmemb, size_t size);
  40
  41 #if defined(__cplusplus) || defined(c_plusplus)
  42 }    /* extern "C" */
  43 #endif
  44
  45 #endif  /* BROTLI_DEC_SAFE_MALLOC_H_ */