/*
 *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef WEBRTC_RTC_BASE_CRC32_H_
#define WEBRTC_RTC_BASE_CRC32_H_

#include <string>

#include "webrtc/rtc_base/basictypes.h"

namespace rtc {

// Updates a CRC32 checksum with |len| bytes from |buf|. |initial| holds the
// checksum result from the previous update; for the first call, it should be 0.
uint32_t UpdateCrc32(uint32_t initial, const void* buf, size_t len);

// Computes a CRC32 checksum using |len| bytes from |buf|.
inline uint32_t ComputeCrc32(const void* buf, size_t len) {
  return UpdateCrc32(0, buf, len);
}
inline uint32_t ComputeCrc32(const std::string& str) {
  return ComputeCrc32(str.c_str(), str.size());
}

}  // namespace rtc

#endif  // WEBRTC_RTC_BASE_CRC32_H_