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Macide Celik 2019-10-28 13:10:41 +03:00 • committed by GitHub
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src/core/operations/Bzip2Decompress.mjs
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/**
* @author Matt C [me@mitt.dev]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Bzip2 from "libbzip2-wasm";
import { isWorkerEnvironment } from "../Utils.mjs";
/**
* Bzip2 Decompress operation
*/
class Bzip2Decompress extends Operation {
/**
* Bzip2Decompress constructor
*/
constructor() {
super();
this.name = "Bzip2 Decompress";
this.module = "Compression";
this.description = "Decompresses data using the Bzip2 algorithm.";
this.infoURL = "https://wikipedia.org/wiki/Bzip2";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.args = [
{
name: "Use low-memory, slower decompression algorithm",
type: "boolean",
value: false
}
];
this.patterns = [
{
"match": "^\\x42\\x5a\\x68",
"flags": "",
"args": []
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {string}
*/
async run(input, args) {
const [small] = args;
if (input.byteLength <= 0) {
throw new OperationError("Please provide an input.");
}
if (isWorkerEnvironment()) self.sendStatusMessage("Loading Bzip2...");
return new Promise((resolve, reject) => {
Bzip2().then(bzip2 => {
if (isWorkerEnvironment()) self.sendStatusMessage("Decompressing data...");
const inpArray = new Uint8Array(input);
const bzip2cc = bzip2.decompressBZ2(inpArray, small ? 1 : 0);
if (bzip2cc.error !== 0) {
reject(new OperationError(bzip2cc.error_msg));
} else {
const output = bzip2cc.output;
resolve(output.buffer.slice(output.byteOffset, output.byteLength + output.byteOffset));
}
});
});
}
}
export default Bzip2Decompress;