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Bzip2 compression support changed to use wasm backend

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x4 speed.
This commit is contained in:
Matt 2019-04-07 18:59:03 +01:00
parent 7796c473ae
commit a339eacd45
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GPG key ID: 2DD462FE98BF38C2
3 changed files with 42 additions and 45 deletions
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38
src/core/operations/Bzip2Decompress.mjs
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@ -5,8 +5,8 @@
*/
import Operation from "../Operation";
import bzip2 from "../vendor/bzip2";
import OperationError from "../errors/OperationError";
import Bzip2 from "libbzip2-wasm";
/**
* Bzip2 Decompress operation
@ -23,9 +23,15 @@ class Bzip2Decompress extends Operation {
this.module = "Compression";
this.description = "Decompresses data using the Bzip2 algorithm.";
this.infoURL = "https://wikipedia.org/wiki/Bzip2";
this.inputType = "byteArray";
this.outputType = "string";
this.args = [];
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",
@ -41,14 +47,24 @@ class Bzip2Decompress extends Operation {
* @returns {string}
*/
run(input, args) {
const compressed = new Uint8Array(input);
try {
const bzip2Reader = bzip2.array(compressed);
return bzip2.simple(bzip2Reader);
} catch (err) {
throw new OperationError(err);
const [small] = args;
if (input.byteLength <= 0) {
throw new OperationError("Please provide an input.");
}
if (ENVIRONMENT_IS_WORKER()) self.sendStatusMessage("Loading Bzip2...");
return new Promise((resolve, reject) => {
Bzip2().then(bzip2 => {
if (ENVIRONMENT_IS_WORKER()) 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));
}
});
});
}
}