Web tool - given a hash, compute day and time
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index.html
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180
index.html
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<!DOCTYPE html>
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<!-- cSpell:ignore blocksize Cbase hhmmss modbus XXYY yaacov -->
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<title>Queue Computer</title>
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<!-- <link rel="stylesheet" href="./style.css"> -->
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<!-- <link rel="icon" href="./favicon.ico" type="image/x-icon"> -->
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</head>
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<body>
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<script>
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/**
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* Calculates the buffers CRC16.
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*
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* @param buffer the data buffer.
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* @return the calculated CRC16.
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*
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* Source: github.com/yaacov/node-modbus-serial
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*/
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const crc16 = (buffer) => {
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let crc = 0xffff;
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// let crc = 0x0000;
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let odd;
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for (let i = 0; i < buffer.length; i++) {
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crc = crc ^ buffer[i];
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for (let j = 0; j < 8; j++) {
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odd = crc & 0x0001;
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crc = crc >> 1;
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if (odd) {
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crc = crc ^ 0xa001;
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}
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}
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}
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return crc.toString(16).toUpperCase();
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};
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const encoder = new TextEncoder();
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const doThing = () => {
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updateString();
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const start = new Date();
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let itr = 0;
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const matches = [];
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const staticFront = front(); // Single document call is faster in loop critical path
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const staticBack = back(); // Single document call is faster in loop critical path
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const queue = document.getElementById("queue").value;
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for (let day = 1; day < 31; day++) {
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for (let hour = 0; hour < 24; hour++) {
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for (let minute = 0; minute < 60; minute++) {
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for (let second = 0; second < 60; second++) {
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itr++;
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const dtg =
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// 123456789 : 4B37
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// "20230610151423:flamp-file.k2s1base6464" : D5C6
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// "20230610" +
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// ("00" + hour).slice(-2) +
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// ("00" + minute).slice(-2) +
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// ("00" + second).slice(-2) +
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// ":flamp-file.k2s1base6464";
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staticFront +
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("00" + day).slice(-2) +
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("00" + hour).slice(-2) +
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("00" + minute).slice(-2) +
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("00" + second).slice(-2) +
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staticBack;
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const res = crc16(encoder.encode(dtg));
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if (res === queue) {
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matches.push([
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("00" + day).slice(-2) +
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" " +
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("00" + hour).slice(-2) +
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":" +
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("00" + minute).slice(-2) +
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":" +
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("00" + second).slice(-2),
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dtg,
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]);
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console.log({
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msg: "MATCH!!!",
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dtg,
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time: hour + ":" + minute + ":" + second,
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res,
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itr,
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});
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}
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// console.log({ res });
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}
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}
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}
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}
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const end = new Date();
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let report = matches.map((arr) => arr.join(" - ")).join("\n");
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console.log({
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matchesCount: matches.length,
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matches,
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itr,
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start,
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end,
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diff: end.getTime() - start.getTime(),
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});
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report =
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report +
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"\n\nFound " +
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matches.length +
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" matches in " +
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(end.getTime() - start.getTime()) +
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" milliseconds.";
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document.getElementById("results").value = report;
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};
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const front = () => document.getElementById("date").value;
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const back = () =>
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":" +
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document.getElementById("filename").value +
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(document.getElementById("compressed").checked ? "1" : "0") +
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document.getElementById("encoding").value +
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document.getElementById("blocksize").value;
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const updateString = () => {
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document.getElementById("dtgAndMore").innerHTML =
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front() + "DDhhmmss" + back();
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};
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</script>
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<main>
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<h1>Queue Computer for the Month</h1>
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<p>
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<label for="queue">Queue</label>
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<input id="queue" value="D5C6" onchange="updateString()" /><br />
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<label for="date">Date</label>
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<input id="date" value="202306" onchange="updateString()" /><br />
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<label for="filename">Filename</label>
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<input
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id="filename"
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value="flamp-file.k2s"
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onchange="updateString()"
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/><br />
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<label for="compressed">Compressed</label>
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<input
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type="checkbox"
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id="compressed"
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checked
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onchange="updateString()"
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/><br />
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<label for="encoding">Encoding</label>
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<select id="encoding" value="base64" onchange="updateString()">
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<option value="base64" selected>base64</option>
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<option value="base128">base128</option>
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<option value="base256">base256</option></select
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><br />
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<label for="blocksize">BlockSize</label>
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<select id="blocksize" value="64" onchange="updateString()">
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<option value="32">32</option>
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<option value="64" selected>64</option>
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<option value="128">128</option>
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<option value="256">256</option></select
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><br />
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<label id="dtgAndMore">YYYYMMDDhhmmss:filenameCbaseXXYY</label>
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</p>
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<button onclick="doThing()">Do the Thing!</button><br />
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<label for="results">Results</label>
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<textarea type="text" cols="55" rows="12" id="results" value=""></textarea
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><br />
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</main>
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<!-- <script src="index.js"></script> -->
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</body>
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</html>
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