mirror of https://github.com/gchq/CyberChef.git
78 lines
2.0 KiB
JavaScript
78 lines
2.0 KiB
JavaScript
/**
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* @author gchq77703 []
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2018
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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 TLVParser from "../lib/TLVParser.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* Parse TLV operation
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*/
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class ParseTLV extends Operation {
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/**
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* ParseTLV constructor
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*/
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constructor() {
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super();
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this.name = "Parse TLV";
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this.module = "Default";
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this.description = "Converts a Type-Length-Value (TLV) encoded string into a JSON object. Can optionally include a <code>Key</code> / <code>Type</code> entry. <br><br>Tags: Key-Length-Value, KLV, Length-Value, LV";
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this.infoURL = "https://wikipedia.org/wiki/Type-length-value";
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this.inputType = "ArrayBuffer";
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this.outputType = "JSON";
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this.args = [
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{
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name: "Type/Key size",
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type: "number",
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value: 1
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},
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{
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name: "Length size",
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type: "number",
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value: 1
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},
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{
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name: "Use BER",
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type: "boolean",
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value: false
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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 {string}
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*/
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run(input, args) {
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const [bytesInKey, bytesInLength, basicEncodingRules] = args;
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input = new Uint8Array(input);
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if (bytesInKey <= 0 && bytesInLength <= 0)
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throw new OperationError("Type or Length size must be greater than 0");
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const tlv = new TLVParser(input, { bytesInLength, basicEncodingRules });
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const data = [];
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while (!tlv.atEnd()) {
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const key = bytesInKey ? tlv.getValue(bytesInKey) : undefined;
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const length = tlv.getLength();
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const value = tlv.getValue(length);
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data.push({ key, length, value });
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}
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return data;
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}
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}
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export default ParseTLV;
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