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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233// ASN.1 JavaScript decoder// Copyright (c) 2008-2024 Lapo Luchini <lapo@lapo.it>
// Permission to use, copy, modify, and/or distribute this software for any// purpose with or without fee is hereby granted, provided that the above// copyright notice and this permission notice appear in all copies.// // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import { ASN1 } from './asn1.js';import { oids } from './oids.js';import { bindContextMenu } from './context.js';
const lineLength = 80, contentLength = 8 * lineLength, DOM = { ellipsis: '\u2026', tag: function (tagName, className, text) { let t = document.createElement(tagName); t.className = className; if (text) t.innerText = text; return t; }, text: function (str) { return document.createTextNode(str); }, space: function () { return DOM.tag('span', 'spaces', ' '); }, breakLines: function (str, length) { let lines = str.split(/\r?\n/), o = ''; for (let i = 0; i < lines.length; ++i) { let line = lines[i]; if (i > 0) o += '\n'; while (line.length > length) { o += line.substring(0, length); o += '\n'; line = line.substring(length); } o += line; } return o; }, };
export class ASN1DOM extends ASN1 {
toDOM(spaces) { spaces = spaces || ''; let isOID = (typeof oids === 'object') && (this.tag.isUniversal() && (this.tag.tagNumber == 0x06) || (this.tag.tagNumber == 0x0D)); let node = DOM.tag('div', 'node'); node.asn1 = this; let head = DOM.tag('span', 'head'); head.appendChild(DOM.tag('span', 'spaces', spaces)); const typeName = this.typeName().replace(/_/g, ' '); if (this.def) { if (this.def.id) { head.appendChild(DOM.tag('span', 'name id', this.def.id)); head.appendChild(DOM.space()); } if (this.def.name && this.def.name != typeName) { head.appendChild(DOM.tag('span', 'name type', this.def.name)); head.appendChild(DOM.space()); } if (this.def.mismatch) { head.appendChild(DOM.tag('span', 'name type', '[?]')); head.appendChild(DOM.space()); } } head.appendChild(DOM.text(typeName)); let content; try { content = this.content(contentLength); } catch (e) { content = 'Cannot decode: ' + e; } let oid; if (content !== null) { let preview = DOM.tag('span', 'preview'), shortContent; if (isOID) content = content.split('\n', 1)[0]; shortContent = (content.length > lineLength) ? content.substring(0, lineLength) + DOM.ellipsis : content; preview.appendChild(DOM.space()); preview.appendChild(DOM.text(shortContent)); if (isOID) { oid = oids[content]; if (oid) { if (oid.d) { preview.appendChild(DOM.space()); let oidd = DOM.tag('span', 'oid description', oid.d); preview.appendChild(oidd); } if (oid.c) { preview.appendChild(DOM.space()); let oidc = DOM.tag('span', 'oid comment', '(' + oid.c + ')'); preview.appendChild(oidc); } } } head.appendChild(preview); content = DOM.breakLines(content, lineLength); content = content.replace(/</g, '<'); content = content.replace(/\n/g, '<br>'); } node.appendChild(head); this.node = node; this.head = head; let value = DOM.tag('div', 'value'); let s = 'Offset: ' + this.stream.pos + '<br>'; s += 'Length: ' + this.header + '+'; if (this.length >= 0) s += this.length; else s += (-this.length) + ' (undefined)'; if (this.tag.tagConstructed) s += '<br>(constructed)'; else if ((this.tag.isUniversal() && ((this.tag.tagNumber == 0x03) || (this.tag.tagNumber == 0x04))) && (this.sub !== null)) s += '<br>(encapsulates)'; //TODO if (this.tag.isUniversal() && this.tag.tagNumber == 0x03) s += "Unused bits: " if (content !== null) { s += '<br>Value:<br><b>' + content + '</b>'; if (isOID && oid) { if (oid.d) s += '<br>' + oid.d; if (oid.c) s += '<br>' + oid.c; if (oid.w) s += '<br>(warning!)'; } } value.innerHTML = s; node.appendChild(value); let sub = DOM.tag('div', 'sub'); if (this.sub !== null) { spaces += '\xA0 '; for (let i = 0, max = this.sub.length; i < max; ++i) sub.appendChild(this.sub[i].toDOM(spaces)); } node.appendChild(sub); bindContextMenu(node); return node; } fakeHover(current) { this.node.classList.add('hover'); if (current) this.head.classList.add('hover'); } fakeOut(current) { this.node.classList.remove('hover'); if (current) this.head.classList.remove('hover'); } toHexDOM_sub(node, className, stream, start, end) { if (start >= end) return; let sub = DOM.tag('span', className, stream.hexDump(start, end)); node.appendChild(sub); } toHexDOM(root, trim=true) { let node = DOM.tag('span', 'hex'); if (root === undefined) root = node; this.head.hexNode = node; this.head.onmouseover = function () { this.hexNode.className = 'hexCurrent'; }; this.head.onmouseout = function () { this.hexNode.className = 'hex'; }; node.asn1 = this; node.onmouseover = function () { let current = !root.selected; if (current) { root.selected = this.asn1; this.className = 'hexCurrent'; } this.asn1.fakeHover(current); }; node.onmouseout = function () { let current = (root.selected == this.asn1); this.asn1.fakeOut(current); if (current) { root.selected = null; this.className = 'hex'; } }; bindContextMenu(node); if (root == node) { let lineStart = this.posStart() & 0xF; if (lineStart != 0) { let skip = DOM.tag('span', 'skip'); let skipStr = ''; for (let j = lineStart; j > 0; --j) skipStr += ' '; if (lineStart >= 8) skipStr += ' '; skip.innerText = skipStr; node.appendChild(skip); } } this.toHexDOM_sub(node, 'tag', this.stream, this.posStart(), this.posLen()); this.toHexDOM_sub(node, (this.length >= 0) ? 'dlen' : 'ulen', this.stream, this.posLen(), this.posContent()); if (this.sub === null) { let start = this.posContent(); let end = this.posEnd(); if (!trim || end - start < 10 * 16) node.appendChild(DOM.text( this.stream.hexDump(start, end))); else { let end1 = start + 5 * 16 - (start & 0xF); let start2 = end - 16 - (end & 0xF); node.appendChild(DOM.text(this.stream.hexDump(start, end1))); node.appendChild(DOM.tag('span', 'skip', '\u2026 skipping ' + (start2 - end1) + ' bytes \u2026\n')); node.appendChild(DOM.text(this.stream.hexDump(start2, end))); } } else if (this.sub.length > 0) { let first = this.sub[0]; let last = this.sub[this.sub.length - 1]; this.toHexDOM_sub(node, 'intro', this.stream, this.posContent(), first.posStart()); for (let i = 0, max = this.sub.length; i < max; ++i) node.appendChild(this.sub[i].toHexDOM(root, trim)); this.toHexDOM_sub(node, 'outro', this.stream, last.posEnd(), this.posEnd()); } else this.toHexDOM_sub(node, 'outro', this.stream, this.posContent(), this.posEnd()); return node; } static decode(stream, offset) { return ASN1.decode(stream, offset, ASN1DOM); }
}