mirror of https://github.com/gchq/CyberChef.git
113 lines
2.5 KiB
JavaScript
113 lines
2.5 KiB
JavaScript
/**
|
|
* Web worker to handle dish conversion operations.
|
|
*
|
|
* @author j433866 [j433866@gmail.com]
|
|
* @copyright Crown Copyright 2019
|
|
* @license Apache-2.0
|
|
*/
|
|
|
|
import Dish from "../../core/Dish.mjs";
|
|
import Utils from "../../core/Utils.mjs";
|
|
import cptable from "codepage";
|
|
import loglevelMessagePrefix from "loglevel-message-prefix";
|
|
|
|
loglevelMessagePrefix(log, {
|
|
prefixes: [],
|
|
staticPrefixes: ["DishWorker"]
|
|
});
|
|
|
|
self.addEventListener("message", function(e) {
|
|
// Handle message from the main thread
|
|
const r = e.data;
|
|
log.debug(`Receiving command '${r.action}'`);
|
|
|
|
switch (r.action) {
|
|
case "getDishAs":
|
|
getDishAs(r.data);
|
|
break;
|
|
case "getDishTitle":
|
|
getDishTitle(r.data);
|
|
break;
|
|
case "bufferToStr":
|
|
bufferToStr(r.data);
|
|
break;
|
|
case "setLogLevel":
|
|
log.setLevel(r.data, false);
|
|
break;
|
|
default:
|
|
log.error(`Unknown action: '${r.action}'`);
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Translates the dish to a given type
|
|
*
|
|
* @param {object} data
|
|
* @param {Dish} data.dish
|
|
* @param {string} data.type
|
|
* @param {number} data.id
|
|
*/
|
|
async function getDishAs(data) {
|
|
const newDish = new Dish(data.dish),
|
|
value = await newDish.get(data.type),
|
|
transferable = (data.type === "ArrayBuffer") ? [value] : undefined;
|
|
|
|
self.postMessage({
|
|
action: "dishReturned",
|
|
data: {
|
|
value: value,
|
|
id: data.id
|
|
}
|
|
}, transferable);
|
|
}
|
|
|
|
/**
|
|
* Gets the title of the given dish
|
|
*
|
|
* @param {object} data
|
|
* @param {Dish} data.dish
|
|
* @param {number} data.id
|
|
* @param {number} data.maxLength
|
|
*/
|
|
async function getDishTitle(data) {
|
|
const newDish = new Dish(data.dish),
|
|
title = await newDish.getTitle(data.maxLength);
|
|
|
|
self.postMessage({
|
|
action: "dishReturned",
|
|
data: {
|
|
value: title,
|
|
id: data.id
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Translates a buffer to a string using a specified encoding
|
|
*
|
|
* @param {object} data
|
|
* @param {ArrayBuffer} data.buffer
|
|
* @param {number} data.id
|
|
* @param {number} data.encoding
|
|
*/
|
|
async function bufferToStr(data) {
|
|
let str;
|
|
if (data.encoding === 0) {
|
|
str = Utils.arrayBufferToStr(data.buffer);
|
|
} else {
|
|
try {
|
|
str = cptable.utils.decode(data.encoding, new Uint8Array(data.buffer));
|
|
} catch (err) {
|
|
str = err.message;
|
|
}
|
|
}
|
|
|
|
self.postMessage({
|
|
action: "dishReturned",
|
|
data: {
|
|
value: str,
|
|
id: data.id
|
|
}
|
|
});
|
|
}
|