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