文件操作 - crc32-stream.js
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文件: /var/www/OLD/node_modules/crc32-stream/lib/crc32-stream.js
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/** * node-crc32-stream * * Copyright (c) 2014 Chris Talkington, contributors. * Licensed under the MIT license. * https://github.com/archiverjs/node-crc32-stream/blob/master/LICENSE-MIT */ 'use strict'; const {Transform} = require('readable-stream'); const crc32 = require('crc-32'); class CRC32Stream extends Transform { constructor(options) { super(options); this.checksum = Buffer.allocUnsafe(4); this.checksum.writeInt32BE(0, 0); this.rawSize = 0; } _transform(chunk, encoding, callback) { if (chunk) { this.checksum = crc32.buf(chunk, this.checksum) >>> 0; this.rawSize += chunk.length; } callback(null, chunk); } digest(encoding) { const checksum = Buffer.allocUnsafe(4); checksum.writeUInt32BE(this.checksum >>> 0, 0); return encoding ? checksum.toString(encoding) : checksum; } hex() { return this.digest('hex').toUpperCase(); } size() { return this.rawSize; } } module.exports = CRC32Stream;
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