1 /*
2  *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef RTC_BASE_CRC32_H_
12 #define RTC_BASE_CRC32_H_
13 
14 #include <stddef.h>
15 #include <stdint.h>
16 
17 #include <string>
18 
19 namespace rtc {
20 
21 // Updates a CRC32 checksum with |len| bytes from |buf|. |initial| holds the
22 // checksum result from the previous update; for the first call, it should be 0.
23 uint32_t UpdateCrc32(uint32_t initial, const void* buf, size_t len);
24 
25 // Computes a CRC32 checksum using |len| bytes from |buf|.
ComputeCrc32(const void * buf,size_t len)26 inline uint32_t ComputeCrc32(const void* buf, size_t len) {
27   return UpdateCrc32(0, buf, len);
28 }
ComputeCrc32(const std::string & str)29 inline uint32_t ComputeCrc32(const std::string& str) {
30   return ComputeCrc32(str.c_str(), str.size());
31 }
32 
33 }  // namespace rtc
34 
35 #endif  // RTC_BASE_CRC32_H_
36