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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120/*global Hex, Base64, ASN1 */"use strict";
var maxLength = 10240, reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/, tree = id('tree'), dump = id('dump'), wantHex = id('wantHex'), area = id('area'), file = id('file'), hash = null;function id(elem) { return document.getElementById(elem);}function text(el, string) { if ('textContent' in el) el.textContent = string; else el.innerText = string;}function decode(der) { tree.innerHTML = ''; dump.innerHTML = ''; try { var asn1 = ASN1.decode(der); tree.appendChild(asn1.toDOM()); if (wantHex.checked) dump.appendChild(asn1.toHexDOM()); var hex = (der.length < maxLength) ? asn1.toHexString() : ''; if (area.value === '') area.value = hex; try { window.location.hash = hash = '#' + hex; } catch (e) { // fails with "Access Denied" on IE with URLs longer than ~2048 chars window.location.hash = hash = '#'; } } catch (e) { text(tree, e); }}function decodeArea() { try { var val = area.value, der = reHex.test(val) ? Hex.decode(val) : Base64.unarmor(val); decode(der); } catch (e) { text(tree, e); dump.innerHTML = ''; }}function decodeBinaryString(str) { var der; try { if (reHex.test(str)) der = Hex.decode(str); else if (Base64.re.test(str)) der = Base64.unarmor(str); else der = str; decode(der); } catch (e) { text(tree, 'Cannot decode file.'); dump.innerHTML = ''; }}function clearAll() { area.value = ''; tree.innerHTML = ''; dump.innerHTML = ''; hash = window.location.hash = '';}// this is only used if window.FileReaderfunction read(f) { area.value = ''; // clear text area, will get hex content var r = new FileReader(); r.onloadend = function () { if (r.error) alert("Your browser couldn't read the specified file (error code " + r.error.code + ")."); else decodeBinaryString(r.result); }; r.readAsBinaryString(f);}function load() { if (file.files.length === 0) alert("Select a file to load first."); else read(file.files[0]);}function loadFromHash() { if (window.location.hash && window.location.hash != hash) { hash = window.location.hash; // Firefox is not consistent with other browsers and return an // already-decoded hash string so we risk double-decoding here, // but since % is not allowed in base64 nor hexadecimal, it's ok area.value = decodeURIComponent(hash.substr(1)); decodeArea(); }}function stop(e) { e.stopPropagation(); e.preventDefault();}function dragAccept(e) { stop(e); if (e.dataTransfer.files.length > 0) read(e.dataTransfer.files[0]);}// mainif ('onhashchange' in window) window.onhashchange = loadFromHash;loadFromHash();document.ondragover = stop;document.ondragleave = stop;if ('FileReader' in window) { file.style.display = 'block'; file.onchange = load; document.ondrop = dragAccept;}