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86 lines
2.0 KiB
JavaScript
86 lines
2.0 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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import {COMPRESSION_TYPE, ZLIB_COMPRESSION_TYPE_LOOKUP} from "../lib/Zlib";
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import zlibAndGzip from "zlibjs/bin/zlib_and_gzip.min";
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const Zlib = zlibAndGzip.Zlib;
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/**
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* Gzip operation
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*/
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class Gzip extends Operation {
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/**
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* Gzip constructor
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*/
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constructor() {
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super();
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this.name = "Gzip";
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this.module = "Compression";
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this.description = "Compresses data using the deflate algorithm with gzip headers.";
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this.inputType = "byteArray";
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this.outputType = "byteArray";
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this.args = [
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{
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name: "Compression type",
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type: "option",
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value: COMPRESSION_TYPE
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},
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{
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name: "Filename (optional)",
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type: "string",
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value: ""
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},
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{
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name: "Comment (optional)",
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type: "string",
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value: ""
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},
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{
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name: "Include file checksum",
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type: "boolean",
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value: false
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}
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];
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}
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/**
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* @param {byteArray} input
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* @param {Object[]} args
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* @returns {byteArray}
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*/
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run(input, args) {
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const filename = args[1],
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comment = args[2],
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options = {
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deflateOptions: {
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compressionType: ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
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},
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flags: {
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fhcrc: args[3]
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}
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};
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if (filename.length) {
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options.flags.fname = true;
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options.filename = filename;
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}
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if (comment.length) {
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options.flags.fcommenct = true;
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options.comment = comment;
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}
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const gzip = new Zlib.Gzip(input, options);
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return Array.prototype.slice.call(gzip.compress());
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}
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}
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export default Gzip;
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