| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| const List<int> _CRC32_TABLE = [ |
| 0x00000000, |
| 0x77073096, |
| 0xEE0E612C, |
| 0x990951BA, |
| 0x076DC419, |
| 0x706AF48F, |
| 0xE963A535, |
| 0x9E6495A3, |
| 0x0EDB8832, |
| 0x79DCB8A4, |
| 0xE0D5E91E, |
| 0x97D2D988, |
| 0x09B64C2B, |
| 0x7EB17CBD, |
| 0xE7B82D07, |
| 0x90BF1D91, |
| 0x1DB71064, |
| 0x6AB020F2, |
| 0xF3B97148, |
| 0x84BE41DE, |
| 0x1ADAD47D, |
| 0x6DDDE4EB, |
| 0xF4D4B551, |
| 0x83D385C7, |
| 0x136C9856, |
| 0x646BA8C0, |
| 0xFD62F97A, |
| 0x8A65C9EC, |
| 0x14015C4F, |
| 0x63066CD9, |
| 0xFA0F3D63, |
| 0x8D080DF5, |
| 0x3B6E20C8, |
| 0x4C69105E, |
| 0xD56041E4, |
| 0xA2677172, |
| 0x3C03E4D1, |
| 0x4B04D447, |
| 0xD20D85FD, |
| 0xA50AB56B, |
| 0x35B5A8FA, |
| 0x42B2986C, |
| 0xDBBBC9D6, |
| 0xACBCF940, |
| 0x32D86CE3, |
| 0x45DF5C75, |
| 0xDCD60DCF, |
| 0xABD13D59, |
| 0x26D930AC, |
| 0x51DE003A, |
| 0xC8D75180, |
| 0xBFD06116, |
| 0x21B4F4B5, |
| 0x56B3C423, |
| 0xCFBA9599, |
| 0xB8BDA50F, |
| 0x2802B89E, |
| 0x5F058808, |
| 0xC60CD9B2, |
| 0xB10BE924, |
| 0x2F6F7C87, |
| 0x58684C11, |
| 0xC1611DAB, |
| 0xB6662D3D, |
| 0x76DC4190, |
| 0x01DB7106, |
| 0x98D220BC, |
| 0xEFD5102A, |
| 0x71B18589, |
| 0x06B6B51F, |
| 0x9FBFE4A5, |
| 0xE8B8D433, |
| 0x7807C9A2, |
| 0x0F00F934, |
| 0x9609A88E, |
| 0xE10E9818, |
| 0x7F6A0DBB, |
| 0x086D3D2D, |
| 0x91646C97, |
| 0xE6635C01, |
| 0x6B6B51F4, |
| 0x1C6C6162, |
| 0x856530D8, |
| 0xF262004E, |
| 0x6C0695ED, |
| 0x1B01A57B, |
| 0x8208F4C1, |
| 0xF50FC457, |
| 0x65B0D9C6, |
| 0x12B7E950, |
| 0x8BBEB8EA, |
| 0xFCB9887C, |
| 0x62DD1DDF, |
| 0x15DA2D49, |
| 0x8CD37CF3, |
| 0xFBD44C65, |
| 0x4DB26158, |
| 0x3AB551CE, |
| 0xA3BC0074, |
| 0xD4BB30E2, |
| 0x4ADFA541, |
| 0x3DD895D7, |
| 0xA4D1C46D, |
| 0xD3D6F4FB, |
| 0x4369E96A, |
| 0x346ED9FC, |
| 0xAD678846, |
| 0xDA60B8D0, |
| 0x44042D73, |
| 0x33031DE5, |
| 0xAA0A4C5F, |
| 0xDD0D7CC9, |
| 0x5005713C, |
| 0x270241AA, |
| 0xBE0B1010, |
| 0xC90C2086, |
| 0x5768B525, |
| 0x206F85B3, |
| 0xB966D409, |
| 0xCE61E49F, |
| 0x5EDEF90E, |
| 0x29D9C998, |
| 0xB0D09822, |
| 0xC7D7A8B4, |
| 0x59B33D17, |
| 0x2EB40D81, |
| 0xB7BD5C3B, |
| 0xC0BA6CAD, |
| 0xEDB88320, |
| 0x9ABFB3B6, |
| 0x03B6E20C, |
| 0x74B1D29A, |
| 0xEAD54739, |
| 0x9DD277AF, |
| 0x04DB2615, |
| 0x73DC1683, |
| 0xE3630B12, |
| 0x94643B84, |
| 0x0D6D6A3E, |
| 0x7A6A5AA8, |
| 0xE40ECF0B, |
| 0x9309FF9D, |
| 0x0A00AE27, |
| 0x7D079EB1, |
| 0xF00F9344, |
| 0x8708A3D2, |
| 0x1E01F268, |
| 0x6906C2FE, |
| 0xF762575D, |
| 0x806567CB, |
| 0x196C3671, |
| 0x6E6B06E7, |
| 0xFED41B76, |
| 0x89D32BE0, |
| 0x10DA7A5A, |
| 0x67DD4ACC, |
| 0xF9B9DF6F, |
| 0x8EBEEFF9, |
| 0x17B7BE43, |
| 0x60B08ED5, |
| 0xD6D6A3E8, |
| 0xA1D1937E, |
| 0x38D8C2C4, |
| 0x4FDFF252, |
| 0xD1BB67F1, |
| 0xA6BC5767, |
| 0x3FB506DD, |
| 0x48B2364B, |
| 0xD80D2BDA, |
| 0xAF0A1B4C, |
| 0x36034AF6, |
| 0x41047A60, |
| 0xDF60EFC3, |
| 0xA867DF55, |
| 0x316E8EEF, |
| 0x4669BE79, |
| 0xCB61B38C, |
| 0xBC66831A, |
| 0x256FD2A0, |
| 0x5268E236, |
| 0xCC0C7795, |
| 0xBB0B4703, |
| 0x220216B9, |
| 0x5505262F, |
| 0xC5BA3BBE, |
| 0xB2BD0B28, |
| 0x2BB45A92, |
| 0x5CB36A04, |
| 0xC2D7FFA7, |
| 0xB5D0CF31, |
| 0x2CD99E8B, |
| 0x5BDEAE1D, |
| 0x9B64C2B0, |
| 0xEC63F226, |
| 0x756AA39C, |
| 0x026D930A, |
| 0x9C0906A9, |
| 0xEB0E363F, |
| 0x72076785, |
| 0x05005713, |
| 0x95BF4A82, |
| 0xE2B87A14, |
| 0x7BB12BAE, |
| 0x0CB61B38, |
| 0x92D28E9B, |
| 0xE5D5BE0D, |
| 0x7CDCEFB7, |
| 0x0BDBDF21, |
| 0x86D3D2D4, |
| 0xF1D4E242, |
| 0x68DDB3F8, |
| 0x1FDA836E, |
| 0x81BE16CD, |
| 0xF6B9265B, |
| 0x6FB077E1, |
| 0x18B74777, |
| 0x88085AE6, |
| 0xFF0F6A70, |
| 0x66063BCA, |
| 0x11010B5C, |
| 0x8F659EFF, |
| 0xF862AE69, |
| 0x616BFFD3, |
| 0x166CCF45, |
| 0xA00AE278, |
| 0xD70DD2EE, |
| 0x4E048354, |
| 0x3903B3C2, |
| 0xA7672661, |
| 0xD06016F7, |
| 0x4969474D, |
| 0x3E6E77DB, |
| 0xAED16A4A, |
| 0xD9D65ADC, |
| 0x40DF0B66, |
| 0x37D83BF0, |
| 0xA9BCAE53, |
| 0xDEBB9EC5, |
| 0x47B2CF7F, |
| 0x30B5FFE9, |
| 0xBDBDF21C, |
| 0xCABAC28A, |
| 0x53B39330, |
| 0x24B4A3A6, |
| 0xBAD03605, |
| 0xCDD70693, |
| 0x54DE5729, |
| 0x23D967BF, |
| 0xB3667A2E, |
| 0xC4614AB8, |
| 0x5D681B02, |
| 0x2A6F2B94, |
| 0xB40BBE37, |
| 0xC30C8EA1, |
| 0x5A05DF1B, |
| 0x2D02EF8D |
| ]; |
| |
| /// Get the CRC-32 checksum of the given array. You can append bytes to an |
| /// already computed crc by specifying the previous [crc] value. |
| int getCrc32(List<int> array, [int crc = 0]) { |
| int len = array.length; |
| crc = crc ^ 0xffffffff; |
| int ip = 0; |
| while (len >= 8) { |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| len -= 8; |
| } |
| if (len > 0) { |
| do { |
| crc = _CRC32_TABLE[(crc ^ array[ip++]) & 0xff] ^ (crc >> 8); |
| } while (--len > 0); |
| } |
| return crc ^ 0xffffffff; |
| } |