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<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
</head>
<body>
<div class="component m-3">
<div class="row">
<div class="col-sm mb-3">
<div class="card">
<div class="card-header">
Kort info
</div>
<div class="card-body">
<div class="input-group mb-3">
<div class="input-group-prepend">
<span class="input-group-text">ID</span>
</div>
<input style="font-family: monospace" type="text" id="cardid" class="form-control">
<div class="input-group-append">
<span style="font-family: monospace" id="checkdigitholder" class="input-group-text">check: <span id="checkdigit">00</span></span>
</div>
<div class="invalid-feedback">
Kort id kan kun blive et tal med 6 cifre
</div>
</div>
<div id="errchkdigit" style="display: none" class="alert alert-danger">
Invalid check digit
</div>
<button type="button" onclick="updatefromid()" class="btn btn-outline-secondary mb-3">Recalc</button>
</div>
</div>
</div>
<div class="col-sm">
<div class="card">
<div class="card-header">
Sektor 15
</div>
<div class="card-body">
<p>Indholdet af block 2 i sektor 15</p>
<div class="input-group mb-3">
<div class="input-group-prepend">
<span class="input-group-text">Hex</span>
</div>
<textarea type="text" class="form-control" id="datahex" style="font-family: monospace"></textarea>
</div>
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text">Ascii</span>
</div>
<textarea type="text" class="form-control" id="dataascii" style="font-family: monospace"></textarea>
<div class="invalid-feedback">
Kunne ikke parse block 2
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script>
// Stolen from https://stackoverflow.com/questions/33920230/how-to-convert-string-from-ascii-to-hexadecimal-in-javascript-or-jquery
String.prototype.convertToHex = function (delim) {
return this.split("").map(function(c) {
return ("0" + c.charCodeAt(0).toString(16)).slice(-2);
}).join(delim || "");
};
String.prototype.convertFromHex = function (delim) {
var str = '';
for(var i = 0; i < this.length; i += 2) {
var v = parseInt(this.substr(i, 2), 16);
// Check if it could decode it
if( isNaN(v) ) {
return null;
}
str += String.fromCharCode(v);
}
return str;
};
function calcsum(num) {
// Calculate the sum
var sum = 0;
while(num) {
sum += num % 10;
num = Math.floor(num / 10);
}
// Subtract one and modulo 16
return (sum-1) % 16;
}
function resetcolours() {
$("#errchkdigit").hide();
$("#checkdigitholder").removeClass("text-danger");
$("#cardid").removeClass("is-invalid is-valid");
$("#dataascii").removeClass("is-invalid is-valid");
$("#datahex").removeClass("is-invalid is-valid");
}
function fillhex(blk) {
// Convert to hex
let blkhex = blk.convertToHex();
$("#datahex").val(blkhex);
$("#datahex").addClass("is-valid");
}
function updatefromid() {
resetcolours();
var id = parseInt($("#cardid").val());
if( isNaN(id) || id.toString().length > 6 || id < 0) {
$("#cardid").addClass("is-invalid");
return
}
// Update check digit
var chk = calcsum(id)
$("#checkdigit").text(chk.toString().padStart(2, '0'));
// Generate block 2 content and save it
var paddedid = id.toString().padEnd(6, '0');
var chkascii = String.fromCharCode(0x30 + chk);
var blkascii = `000${paddedid}0?${chkascii}0000`
$("#dataascii").val(blkascii)
$("#dataascii").addClass("is-valid");
fillhex(blkascii);
}
function updatefromascii(updatehex) {
if( updatehex ) {
resetcolours();
}
let match_regex = /000([0-9]{6})0\?([0-9:;<=>?])0000/
// Extact values
console.log("0001200000?20000" === $("#dataascii").val());
let tag = $("#dataascii").val().match(match_regex);
if( tag == null ) {
$("#dataascii").addClass("is-invalid");
return
}
// Extract vars
idstr = tag[1];
chkascii = tag[2];
// Parse the ints, we assume id and chk are valid
id = parseInt(idstr);
chk = chkascii.charCodeAt(0) - 0x30;
// Verify check digit
if( calcsum(id) != chk ) {
$("#errchkdigit").show();
$("#checkdigitholder").addClass("text-danger");
}
// Fill in stuff everywhere else
$("#cardid").val(id);
$("#checkdigit").text(chk.toString().padStart(2, "0"));
// Mark as valid
$("#cardid").addClass("is-valid");
// This will be set to event by an eventhandler, but false if called from another updatefromhex
if( updatehex ) {
fillhex($("#dataascii").val());
}
}
function updatefromhex() {
resetcolours();
var data = $("#datahex").val().convertFromHex();
$("#dataascii").val(data);
$("#dataascii").addClass("is-valid");
updatefromascii(false);
}
// Attach event
$("#cardid").on('input', updatefromid);
$("#dataascii").on('input', updatefromascii);
$("#datahex").on('input', updatefromhex);
// Run to update all the fields
updatefromid();
</script>
</body>
</html>
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