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| 1 /* | 1 /* |
| 2 * Copyright 2012 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2012 The WebRTC Project Authors. All rights reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 #include "webrtc/base/crc32.h" | 11 #include "webrtc/rtc_base/crc32.h" |
| 12 | 12 |
| 13 #include "webrtc/base/arraysize.h" | 13 #include "webrtc/rtc_base/arraysize.h" |
| 14 | 14 |
| 15 namespace rtc { | 15 namespace rtc { |
| 16 | 16 |
| 17 // This implementation is based on the sample implementation in RFC 1952. | 17 // This implementation is based on the sample implementation in RFC 1952. |
| 18 | 18 |
| 19 // CRC32 polynomial, in reversed form. | 19 // CRC32 polynomial, in reversed form. |
| 20 // See RFC 1952, or http://en.wikipedia.org/wiki/Cyclic_redundancy_check | 20 // See RFC 1952, or http://en.wikipedia.org/wiki/Cyclic_redundancy_check |
| 21 static const uint32_t kCrc32Polynomial = 0xEDB88320; | 21 static const uint32_t kCrc32Polynomial = 0xEDB88320; |
| 22 static uint32_t kCrc32Table[256] = {0}; | 22 static uint32_t kCrc32Table[256] = {0}; |
| 23 | 23 |
| (...skipping 19 matching lines...) Expand all Loading... |
| 43 uint32_t c = start ^ 0xFFFFFFFF; | 43 uint32_t c = start ^ 0xFFFFFFFF; |
| 44 const uint8_t* u = static_cast<const uint8_t*>(buf); | 44 const uint8_t* u = static_cast<const uint8_t*>(buf); |
| 45 for (size_t i = 0; i < len; ++i) { | 45 for (size_t i = 0; i < len; ++i) { |
| 46 c = kCrc32Table[(c ^ u[i]) & 0xFF] ^ (c >> 8); | 46 c = kCrc32Table[(c ^ u[i]) & 0xFF] ^ (c >> 8); |
| 47 } | 47 } |
| 48 return c ^ 0xFFFFFFFF; | 48 return c ^ 0xFFFFFFFF; |
| 49 } | 49 } |
| 50 | 50 |
| 51 } // namespace rtc | 51 } // namespace rtc |
| 52 | 52 |
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