221 lines
8.3 KiB
JavaScript
221 lines
8.3 KiB
JavaScript
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// ASN.1 JavaScript decoder
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// Copyright (c) 2008-2020 Lapo Luchini <lapo@lapo.it>
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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(typeof define != 'undefined' ? define : function (factory) { 'use strict';
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if (typeof module == 'object') factory(function (name) { return require(name); });
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else factory(function (name) { return window[name.substring(2)]; });
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})(function (require) {
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"use strict";
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var ASN1 = require('./asn1'),
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oids = require('./oids'),
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lineLength = 80,
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contentLength = 8 * lineLength,
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DOM = {
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ellipsis: "...",
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tag: function (tagName, className) {
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var t = document.createElement(tagName);
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t.className = className;
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return t;
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},
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text: function (str) {
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return document.createTextNode(str);
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},
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space: function () {
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var t = document.createElement('span');
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t.className = 'spaces';
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t.innerHTML = ' ';
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return t;
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},
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breakLines: function (str, length) {
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var lines = str.split(/\r?\n/),
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o = '';
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for (var i = 0; i < lines.length; ++i) {
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var line = lines[i];
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if (i > 0) o += "\n";
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while (line.length > length) {
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o += line.substring(0, length);
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o += "\n";
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line = line.substring(length);
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}
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o += line;
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}
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return o;
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}
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};
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ASN1.prototype.toDOM = function (spaces) {
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spaces = spaces || '';
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var isOID = (typeof oids === 'object') && (this.tag.isUniversal() && (this.tag.tagNumber == 0x06));
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var node = DOM.tag("div", "node");
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node.asn1 = this;
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var head = DOM.tag("div", "head");
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head.innerHTML = "<span class='spaces'>" + spaces + "</span>" + this.typeName().replace(/_/g, " ");
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var content = this.content(contentLength);
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if (content !== null) {
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var preview = DOM.tag("span", "preview"),
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shortContent;
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if (isOID)
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content = content.split('\n', 1)[0];
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shortContent = (content.length > lineLength) ? content.substring(0, lineLength) + DOM.ellipsis : content;
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preview.appendChild(DOM.space());
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preview.appendChild(DOM.text(shortContent));
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if (isOID) {
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var oid = oids[content];
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if (oid) {
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if (oid.d) {
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preview.appendChild(DOM.space());
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var oidd = DOM.tag("span", "oid description");
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oidd.appendChild(DOM.text(oid.d));
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preview.appendChild(oidd);
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}
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if (oid.c) {
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preview.appendChild(DOM.space());
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var oidc = DOM.tag("span", "oid comment");
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oidc.appendChild(DOM.text("(" + oid.c + ")"));
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preview.appendChild(oidc);
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}
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}
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}
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head.appendChild(preview);
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content = DOM.breakLines(content, lineLength);
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content = content.replace(/</g, "<");
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content = content.replace(/\n/g, "<br>");
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}
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node.appendChild(head);
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this.node = node;
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this.head = head;
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var value = DOM.tag("div", "value");
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var s = "Offset: " + this.stream.pos + "<br>";
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s += "Length: " + this.header + "+";
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if (this.length >= 0)
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s += this.length;
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else
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s += (-this.length) + " (undefined)";
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if (this.tag.tagConstructed)
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s += "<br>(constructed)";
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else if ((this.tag.isUniversal() && ((this.tag.tagNumber == 0x03) || (this.tag.tagNumber == 0x04))) && (this.sub !== null))
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s += "<br>(encapsulates)";
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//TODO if (this.tag.isUniversal() && this.tag.tagNumber == 0x03) s += "Unused bits: "
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if (content !== null) {
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s += "<br>Value:<br><b>" + content + "</b>";
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if (isOID && oid) {
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if (oid.d) s += "<br>" + oid.d;
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if (oid.c) s += "<br>" + oid.c;
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if (oid.w) s += "<br>(warning!)";
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}
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}
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value.innerHTML = s;
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node.appendChild(value);
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var sub = DOM.tag("div", "sub");
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if (this.sub !== null) {
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spaces += '\xA0 ';
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for (var i = 0, max = this.sub.length; i < max; ++i)
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sub.appendChild(this.sub[i].toDOM(spaces));
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}
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node.appendChild(sub);
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head.onclick = function () {
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node.className = (node.className == "node collapsed") ? "node" : "node collapsed";
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};
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return node;
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};
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ASN1.prototype.fakeHover = function (current) {
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this.node.className += " hover";
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if (current)
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this.head.className += " hover";
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};
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ASN1.prototype.fakeOut = function (current) {
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var re = / ?hover/;
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this.node.className = this.node.className.replace(re, "");
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if (current)
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this.head.className = this.head.className.replace(re, "");
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};
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ASN1.prototype.toHexDOM_sub = function (node, className, stream, start, end) {
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if (start >= end)
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return;
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var sub = DOM.tag("span", className);
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sub.appendChild(DOM.text(
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stream.hexDump(start, end)));
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node.appendChild(sub);
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};
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ASN1.prototype.toHexDOM = function (root) {
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var node = DOM.tag("span", "hex");
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if (root === undefined) root = node;
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this.head.hexNode = node;
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this.head.onmouseover = function () { this.hexNode.className = "hexCurrent"; };
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this.head.onmouseout = function () { this.hexNode.className = "hex"; };
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node.asn1 = this;
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node.onmouseover = function () {
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var current = !root.selected;
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if (current) {
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root.selected = this.asn1;
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this.className = "hexCurrent";
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}
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this.asn1.fakeHover(current);
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};
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node.onmouseout = function () {
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var current = (root.selected == this.asn1);
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this.asn1.fakeOut(current);
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if (current) {
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root.selected = null;
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this.className = "hex";
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}
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};
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if (root == node) {
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var lineStart = this.posStart() & 0xF;
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if (lineStart != 0) {
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var skip = DOM.tag("span", "skip");
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var skipStr = '';
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for (var j = lineStart; j > 0; --j)
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skipStr += ' ';
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if (lineStart >= 8)
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skipStr += ' ';
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skip.innerText = skipStr;
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node.appendChild(skip);
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}
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}
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this.toHexDOM_sub(node, "tag", this.stream, this.posStart(), this.posLen());
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this.toHexDOM_sub(node, (this.length >= 0) ? "dlen" : "ulen", this.stream, this.posLen(), this.posContent());
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if (this.sub === null) {
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var start = this.posContent();
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var end = this.posEnd();
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if (end - start < 10 * 16)
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node.appendChild(DOM.text(
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this.stream.hexDump(start, end)));
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else {
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var end1 = start + 5 * 16 - (start & 0xF);
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var start2 = end - 16 - (end & 0xF);
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node.appendChild(DOM.text(
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this.stream.hexDump(start, end1)));
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var sub = DOM.tag("span", "skip");
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sub.appendChild(DOM.text("\u2026 skipping " + (start2 - end1) + " bytes \u2026\n"));
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node.appendChild(sub);
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node.appendChild(DOM.text(
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this.stream.hexDump(start2, end)));
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}
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} else if (this.sub.length > 0) {
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var first = this.sub[0];
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var last = this.sub[this.sub.length - 1];
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this.toHexDOM_sub(node, "intro", this.stream, this.posContent(), first.posStart());
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for (var i = 0, max = this.sub.length; i < max; ++i)
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node.appendChild(this.sub[i].toHexDOM(root));
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this.toHexDOM_sub(node, "outro", this.stream, last.posEnd(), this.posEnd());
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} else
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this.toHexDOM_sub(node, "outro", this.stream, this.posContent(), this.posEnd());
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return node;
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};
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});
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