mirror of https://github.com/gchq/CyberChef.git
79 lines
2.0 KiB
JavaScript
79 lines
2.0 KiB
JavaScript
/**
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* @author tcode2k16 [tcode2k16@gmail.com]
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import Utils from "../Utils.mjs";
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import ieee754 from "ieee754";
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import {DELIM_OPTIONS} from "../lib/Delim.mjs";
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/**
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* From Float operation
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*/
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class FromFloat extends Operation {
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/**
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* FromFloat constructor
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*/
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constructor() {
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super();
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this.name = "From Float";
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this.module = "Default";
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this.description = "Convert from IEEE754 Floating Point Numbers";
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this.infoURL = "https://wikipedia.org/wiki/IEEE_754";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [
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{
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"name": "Endianness",
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"type": "option",
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"value": [
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"Big Endian",
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"Little Endian"
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]
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},
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{
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"name": "Size",
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"type": "option",
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"value": [
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"Float (4 bytes)",
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"Double (8 bytes)"
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]
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},
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{
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"name": "Delimiter",
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"type": "option",
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"value": DELIM_OPTIONS
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {byteArray}
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*/
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run(input, args) {
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if (input.length === 0) return [];
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const [endianness, size, delimiterName] = args;
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const delim = Utils.charRep(delimiterName || "Space");
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const byteSize = size === "Double (8 bytes)" ? 8 : 4;
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const isLE = endianness === "Little Endian";
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const mLen = byteSize === 4 ? 23 : 52;
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const floats = input.split(delim);
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const output = new Array(floats.length*byteSize);
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for (let i = 0; i < floats.length; i++) {
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ieee754.write(output, parseFloat(floats[i]), i*byteSize, isLE, mLen, byteSize);
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}
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return output;
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}
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}
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export default FromFloat;
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