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59 lines
1.4 KiB
JavaScript
59 lines
1.4 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} from "../lib/Zlib";
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import rawdeflate from "zlibjs/bin/rawdeflate.min";
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const Zlib = rawdeflate.Zlib;
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const RAW_COMPRESSION_TYPE_LOOKUP = {
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"Fixed Huffman Coding": Zlib.RawDeflate.CompressionType.FIXED,
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"Dynamic Huffman Coding": Zlib.RawDeflate.CompressionType.DYNAMIC,
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"None (Store)": Zlib.RawDeflate.CompressionType.NONE,
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};
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/**
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* Raw Deflate operation
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*/
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class RawDeflate extends Operation {
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/**
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* RawDeflate constructor
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*/
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constructor() {
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super();
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this.name = "Raw Deflate";
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this.module = "Compression";
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this.description = "Compresses data using the deflate algorithm with no headers.";
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this.inputType = "ArrayBuffer";
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this.outputType = "ArrayBuffer";
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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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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {ArrayBuffer}
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*/
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run(input, args) {
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const deflate = new Zlib.RawDeflate(new Uint8Array(input), {
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compressionType: RAW_COMPRESSION_TYPE_LOOKUP[args[0]]
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});
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return new Uint8Array(deflate.compress()).buffer;
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}
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}
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export default RawDeflate;
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