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 #include "absl/strings/string_view.h" 20 21 namespace rtc { 22 23 // Updates a CRC32 checksum with `len` bytes from `buf`. `initial` holds the 24 // checksum result from the previous update; for the first call, it should be 0. 25 uint32_t UpdateCrc32(uint32_t initial, const void* buf, size_t len); 26 27 // Computes a CRC32 checksum using `len` bytes from `buf`. ComputeCrc32(const void * buf,size_t len)28inline uint32_t ComputeCrc32(const void* buf, size_t len) { 29 return UpdateCrc32(0, buf, len); 30 } ComputeCrc32(absl::string_view str)31inline uint32_t ComputeCrc32(absl::string_view str) { 32 return ComputeCrc32(str.data(), str.size()); 33 } 34 35 } // namespace rtc 36 37 #endif // RTC_BASE_CRC32_H_ 38