50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Misc. common utility functions
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <stdlib.h>
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#include "./utils.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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//------------------------------------------------------------------------------
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// Checked memory allocation
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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 > WEBP_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* WebPSafeMalloc(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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void* WebPSafeCalloc(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 calloc((size_t)nmemb, size);
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}
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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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