mirror of https://github.com/gchq/CyberChef.git
108 lines
3.4 KiB
JavaScript
108 lines
3.4 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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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 OperationError from "../errors/OperationError.mjs";
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/**
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* Offset checker operation
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*/
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class OffsetChecker extends Operation {
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/**
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* OffsetChecker constructor
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*/
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constructor() {
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super();
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this.name = "Offset checker";
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this.module = "Default";
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this.description = "Compares multiple inputs (separated by the specified delimiter) and highlights matching characters which appear at the same position in all samples.";
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this.inputType = "string";
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this.outputType = "html";
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this.args = [
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{
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"name": "Sample delimiter",
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"type": "binaryString",
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"value": "\\n\\n"
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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 {html}
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*/
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run(input, args) {
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const sampleDelim = args[0],
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samples = input.split(sampleDelim),
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outputs = new Array(samples.length);
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let i = 0,
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s = 0,
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match = false,
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inMatch = false,
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chr;
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if (!samples || samples.length < 2) {
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throw new OperationError("Not enough samples, perhaps you need to modify the sample delimiter or add more data?");
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}
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// Initialise output strings
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outputs.fill("", 0, samples.length);
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// Loop through each character in the first sample
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for (i = 0; i < samples[0].length; i++) {
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chr = samples[0][i];
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match = false;
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// Loop through each sample to see if the chars are the same
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for (s = 1; s < samples.length; s++) {
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if (samples[s][i] !== chr) {
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match = false;
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break;
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}
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match = true;
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}
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// Write output for each sample
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for (s = 0; s < samples.length; s++) {
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if (samples[s].length <= i) {
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if (inMatch) outputs[s] += "</span>";
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if (s === samples.length - 1) inMatch = false;
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continue;
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}
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if (match && !inMatch) {
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outputs[s] += "<span class='hl5'>" + Utils.escapeHtml(samples[s][i]);
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if (samples[s].length === i + 1) outputs[s] += "</span>";
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if (s === samples.length - 1) inMatch = true;
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} else if (!match && inMatch) {
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outputs[s] += "</span>" + Utils.escapeHtml(samples[s][i]);
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if (s === samples.length - 1) inMatch = false;
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} else {
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outputs[s] += Utils.escapeHtml(samples[s][i]);
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if (inMatch && samples[s].length === i + 1) {
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outputs[s] += "</span>";
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if (samples[s].length - 1 !== i) inMatch = false;
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}
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}
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if (samples[0].length - 1 === i) {
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if (inMatch) outputs[s] += "</span>";
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outputs[s] += Utils.escapeHtml(samples[s].substring(i + 1));
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}
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}
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}
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return outputs.join(sampleDelim);
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}
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}
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export default OffsetChecker;
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