52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
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/*
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* libjingle
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* Copyright 2012, Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_CRC32_H_
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#define TALK_BASE_CRC32_H_
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#include <string>
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#include "talk/base/basictypes.h"
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namespace talk_base {
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// Updates a CRC32 checksum with |len| bytes from |buf|. |initial| holds the
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// checksum result from the previous update; for the first call, it should be 0.
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uint32 UpdateCrc32(uint32 initial, const void* buf, size_t len);
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// Computes a CRC32 checksum using |len| bytes from |buf|.
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inline uint32 ComputeCrc32(const void* buf, size_t len) {
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return UpdateCrc32(0, buf, len);
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}
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inline uint32 ComputeCrc32(const std::string& str) {
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return ComputeCrc32(str.c_str(), str.size());
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}
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} // namespace talk_base
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#endif // TALK_BASE_CRC32_H_
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