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+/**
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+ * @author Matt C [me@mitt.dev]
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+ * @copyright Crown Copyright 2019
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+ * @license Apache-2.0
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+ */
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+
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+import Operation from "../Operation";
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+import OperationError from "../errors/OperationError";
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+import Bzip2 from "libbzip2-wasm";
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+
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+/**
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+ * Bzip2 Compress operation
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+ */
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+class Bzip2Compress extends Operation {
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+
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+ /**
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+ * Bzip2Compress constructor
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+ */
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+ constructor() {
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+ super();
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+
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+ this.name = "Bzip2 Compress";
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+ this.module = "Compression";
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+ this.description = "yeet";
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+ this.infoURL = "https://en.wikipedia.org/wiki/Bzip2";
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+ this.inputType = "ArrayBuffer";
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+ this.outputType = "File";
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+ this.args = [
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+ {
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+ name: "Block size (100s of kb)",
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+ type: "number",
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+ value: 9
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+ },
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+ {
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+ name: "Work factor",
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+ type: "number",
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+ value: 30
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+ },
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+ {
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+ name: "Compressed filename",
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+ type: "string",
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+ value: "compressed.bz2"
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+ }
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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 {File}
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+ */
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+ run(input, args) {
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+ const [blockSize, workFactor, filename] = args;
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+ if (input.byteLength <= 0) {
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+ throw new OperationError("Please provide an input.");
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+ }
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+ if (ENVIRONMENT_IS_WORKER()) self.sendStatusMessage("Loading Bzip2...");
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+ return new Promise((resolve, reject) => {
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+ Bzip2().then(bzip2 => {
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+ if (ENVIRONMENT_IS_WORKER()) self.sendStatusMessage("Compressing data...");
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+ const inpArray = new Uint8Array(input);
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+ const bzip2cc = bzip2.compressBZ2(inpArray, blockSize, workFactor);
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+ if (bzip2cc.error !== 0) {
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+ reject(new OperationError(bzip2cc.error_msg));
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+ } else {
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+ resolve(new File([bzip2cc.output], filename));
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+ }
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+ });
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+ });
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+ }
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+
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+}
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+
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+export default Bzip2Compress;
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Matt