1 /* 2 * libjingle 3 * Copyright 2012, Google, Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef TALK_BASE_CRC32_H_ 29 #define TALK_BASE_CRC32_H_ 30 31 #include <string> 32 33 #include "talk/base/basictypes.h" 34 35 namespace talk_base { 36 37 // Updates a CRC32 checksum with |len| bytes from |buf|. |initial| holds the 38 // checksum result from the previous update; for the first call, it should be 0. 39 uint32 UpdateCrc32(uint32 initial, const void* buf, size_t len); 40 41 // Computes a CRC32 checksum using |len| bytes from |buf|. 42 inline uint32 ComputeCrc32(const void* buf, size_t len) { 43 return UpdateCrc32(0, buf, len); 44 } 45 inline uint32 ComputeCrc32(const std::string& str) { 46 return ComputeCrc32(str.c_str(), str.size()); 47 } 48 49 } // namespace talk_base 50 51 #endif // TALK_BASE_CRC32_H_ 52
