@technobuddha/library

<!doctype html> <html lang="en"> <head> <title>Code coverage report for crc32.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <link rel="shortcut icon" type="image/x-icon" href="favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="index.html">All files</a> crc32.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 100% Statements 67/67 </div> <div class='fl pad1y space-right2'> 100% Branches 11/11 </div> <div class='fl pad1y space-right2'> 100% Functions 4/4 </div> <div class='fl pad1y space-right2'> 100% Lines 67/67 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. <template id="filterTemplate"> <div class="quiet"> Filter: <input type="search" 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'./@types/text-encoding.ts'; import { type BinaryObject } from './binary-object.ts'; import { encodeBinary } from './encode-binary.ts'; import { encodeText } from './encode-text.ts'; import { HashBase } from './hash-base.ts';   /** * Precomputed CRC-32 lookup table for fast CRC calculations. * * This table contains 256 entries corresponding to all possible byte values (0-255). * Each entry is the result of applying the CRC-32 polynomial to the byte value, * which allows for efficient computation of the CRC-32 checksum by processing data * one byte at a time. * * The table is based on the standard CRC-32 polynomial (0xEDB88320). * @see https://en.wikipedia.org/wiki/Cyclic_redundancy_check * @see https://tools.ietf.org/html/rfc1952#section-8 * @internal */ const crcTable: number[] = [ 0, 1996959894, -301047508, -1727442502, 124634137, 1886057615, -379345611, -1637575261, 249268274, 2044508324, -522852066, -1747789432, 162941995, 2125561021, -407360249, -1866523247, 498536548, 1789927666, -205950648, -2067906082, 450548861, 1843258603, -187386543, -2083289657, 325883990, 1684777152, -43845254, -1973040660, 335633487, 1661365465, -99664541, -1928851979, 997073096, 1281953886, -715111964, -1570279054, 1006888145, 1258607687, -770865667, -1526024853, 901097722, 1119000684, -608450090, -1396901568, 853044451, 1172266101, -589951537, -1412350631, 651767980, 1373503546, -925412992, -1076862698, 565507253, 1454621731, -809855591, -1195530993, 671266974, 1594198024, -972236366, -1324619484, 795835527, 1483230225, -1050600021, -1234817731, 1994146192, 31158534, -1731059524, -271249366, 1907459465, 112637215, -1614814043, -390540237, 2013776290, 251722036, -1777751922, -519137256, 2137656763, 141376813, -1855689577, -429695999, 1802195444, 476864866, -2056965928, -228458418, 1812370925, 453092731, -2113342271, -183516073, 1706088902, 314042704, -1950435094, -54949764, 1658658271, 366619977, -1932296973, -69972891, 1303535960, 984961486, -1547960204, -725929758, 1256170817, 1037604311, -1529756563, -740887301, 1131014506, 879679996, -1385723834, -631195440, 1141124467, 855842277, -1442165665, -586318647, 1342533948, 654459306, -1106571248, -921952122, 1466479909, 544179635, -1184443383, -832445281, 1591671054, 702138776, -1328506846, -942167884, 1504918807, 783551873, -1212326853, -1061524307, -306674912, -1698712650, 62317068, 1957810842, -355121351, -1647151185, 81470997, 1943803523, -480048366, -1805370492, 225274430, 2053790376, -468791541, -1828061283, 167816743, 2097651377, -267414716, -2029476910, 503444072, 1762050814, -144550051, -2140837941, 426522225, 1852507879, -19653770, -1982649376, 282753626, 1742555852, -105259153, -1900089351, 397917763, 1622183637, -690576408, -1580100738, 953729732, 1340076626, -776247311, -1497606297, 1068828381, 1219638859, -670225446, -1358292148, 906185462, 1090812512, -547295293, -1469587627, 829329135, 1181335161, -882789492, -1134132454, 628085408, 1382605366, -871598187, -1156888829, 570562233, 1426400815, -977650754, -1296233688, 733239954, 1555261956, -1026031705, -1244606671, 752459403, 1541320221, -1687895376, -328994266, 1969922972, 40735498, -1677130071, -351390145, 1913087877, 83908371, -1782625662, -491226604, 2075208622, 213261112, -1831694693, -438977011, 2094854071, 198958881, -2032938284, -237706686, 1759359992, 534414190, -2118248755, -155638181, 1873836001, 414664567, -2012718362, -15766928, 1711684554, 285281116, -1889165569, -127750551, 1634467795, 376229701, -1609899400, -686959890, 1308918612, 956543938, -1486412191, -799009033, 1231636301, 1047427035, -1362007478, -640263460, 1088359270, 936918000, -1447252397, -558129467, 1202900863, 817233897, -1111625188, -893730166, 1404277552, 615818150, -1160759803, -841546093, 1423857449, 601450431, -1285129682, -1000256840, 1567103746, 711928724, -1274298825, -1022587231, 1510334235, 755167117, ]; // The CrcTable can be generated with the following code: // for (let n = 0; n < 256; ++n) { // let c = n; // for (let k = 0; k < 8; ++k) { // c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1; // } // // crcTable[n] = c; // }   /** * Compute the CRC32 checksum of a binary object * @example * ```typescript * const crc = new Crc32(); * crc.update('hello world', 'utf8'); * crc.digest('hex'); * // '0d4a1185' * ``` * ```typescript * const crc = new Crc32(); * crc.update(new Uint8Array([0x72,0x69,0x4c,0x4c,0x4f])); * crc.digest('hex'); * // 'c031d497' * ``` * @group Binary * @category Hash */ export class Crc32 extends HashBase { private crc: number;   /** * Creates a new CRC32 hash instance and initializes its internal state. * @remarks * The CRC value is initialized to -1, as required by the CRC32 algorithm specification. * Use {@link update} to process data and {@link digest} to obtain the final hash value. */ public constructor() { super(); this.crc = -1; }   public update(data: BinaryObject | ArrayLike<number>): this; public update(data: string, encoding?: TextEncoding): this; public update( data: BinaryObject | ArrayLike<number> | string, encoding: TextEncoding = 'utf8', ): this { const buffer = typeof data === 'string' ? encodeText(data, encoding) : ArrayBuffer.isView(data) ? new Uint8Array(data.buffer, data.byteOffset, data.byteLength) : new Uint8Array(data);   for (const char of buffer) { this.crc = (this.crc >>> 8) ^ crcTable[(this.crc ^ char) & 0xff]; }   return this; }   public digest(): Uint8Array; public digest(encoding: BinaryEncoding): string; public digest(encoding?: BinaryEncoding): Uint8Array | string { const crc = (this.crc ^ -1) >>> 0; const buffer = new Uint8Array([ (crc & 0xff000000) >>> 24, (crc & 0x00ff0000) >>> 16, (crc & 0x0000ff00) >>> 8, crc & 0x000000ff, ]);   return encoding ? encodeBinary(buffer, encoding) : buffer; } }  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a> at 2025-09-10T15:22:40.218Z </div> <script src="prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="sorter.js"></script> <script src="block-navigation.js"></script> </body> </html>