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* 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 RTC_BASE_CRC32_H_
#define RTC_BASE_CRC32_H_
#include <stddef.h>
#include <stdint.h>
#include <string>
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 // RTC_BASE_CRC32_H_