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 WEBRTC_BASE_CRC32_H_
12#define WEBRTC_BASE_CRC32_H_
13
14#include <string>
15
16#include "webrtc/base/basictypes.h"
17
18namespace rtc {
19
20// Updates a CRC32 checksum with |len| bytes from |buf|. |initial| holds the
21// checksum result from the previous update; for the first call, it should be 0.
22uint32 UpdateCrc32(uint32 initial, const void* buf, size_t len);
23
24// Computes a CRC32 checksum using |len| bytes from |buf|.
25inline uint32 ComputeCrc32(const void* buf, size_t len) {
26  return UpdateCrc32(0, buf, len);
27}
28inline uint32 ComputeCrc32(const std::string& str) {
29  return ComputeCrc32(str.c_str(), str.size());
30}
31
32}  // namespace rtc
33
34#endif  // WEBRTC_BASE_CRC32_H_
35