29 lines
577 B
JavaScript
29 lines
577 B
JavaScript
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// @ts-check
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/** * @type {number[]} */
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const crcTable = [];
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for (let i = 0; i < 256; i++) {
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let b = i;
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for (let j = 0; j < 8; j++) {
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b = b & 1 ? 0xedb88320 ^ (b >>> 1) : b >>> 1;
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}
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crcTable[i] = b >>> 0;
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}
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/**
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* Compute the CRC32 checksum of some `Uint8Array`s.
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* @param {Uint8Array[]} uint8arrays
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* @returns {number}
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*/
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export default (...uint8arrays) => {
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let crc = -1;
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for (const bytes of uint8arrays) {
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for (let i = 0; i < bytes.length; i++) {
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crc = crcTable[(crc ^ bytes[i]) & 0xff] ^ (crc >>> 8);
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}
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}
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return (crc ^ -1) >>> 0;
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};
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