Added Web based RDP support with NLA, #3867 and #3914

rdp/asn1/spec.js

@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2014-2015 Sylvain Peyrefitte
+ *
+ * This file is part of node-rdpjs.
+ *
+ * node-rdpjs is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+var inherits = require('util').inherits;
+var type = require('../core').type;
+var error = require('../core').error;
+
+/**
+ * Tag Class
+ */
+var TagClass = {
+	Universal : 0x00,
+	Application : 0x40,
+	Context : 0x80,
+	Private : 0xC0
+};
+
+/**
+ * Tag Format
+ */
+var TagFormat = {
+	Primitive : 0x00,
+	Constructed : 0x20
+};
+
+/**
+ * ASN.1 tag
+ * @param tagClass {TagClass}
+ * @param tagFormat {TagFormat}
+ * @param tagNumber {integer}
+ */
+function Asn1Tag(tagClass, tagFormat, tagNumber) {
+	this.tagClass = tagClass;
+	this.tagFormat = tagFormat;
+	this.tagNumber = tagNumber;
+}
+
+/**
+ * ASN.1 Specification
+ * @param tag {Asn1Tag}
+ */
+function Asn1Spec(tag) {
+	this.tag = tag;
+	this.opt = false;
+}
+
+/**
+ * Add an implicit tag
+ * override tag
+ * @param tag {Asn1Tag}
+ * @returns {Asn1Spec}
+ */
+Asn1Spec.prototype.implicitTag = function(tag) {
+	this.tag = tag;
+	return this;
+};
+
+/**
+ * Set optional to true
+ * @returns {Asn1Spec}
+ */
+Asn1Spec.prototype.optional = function() {
+	this.opt = true;
+	return this;
+};
+
+/**
+ * Add explicit tag
+ * Append new tag header to existing tag
+ * @param tag {Asn1Tag}
+ * @returns {Asn1SpecExplicitTag}
+ */
+Asn1Spec.prototype.explicitTag = function(tag) {
+	return new Asn1SpecExplicitTag(tag, this);
+};
+
+/**
+ * Decode must be implemented by all sub type
+ * @param s {type.Stream}
+ * @param decoder
+ */
+Asn1Spec.prototype.decode = function(s, decoder) {
+	throw new error.FatalError('NODE_RDP_AS1_SPEC_DECODE_NOT_IMPLEMENTED');
+};
+
+/**
+ * Encode must be implemented by all sub type
+ * @param decoder
+ */
+Asn1Spec.prototype.encode = function(encoder) {
+	throw new error.FatalError('NODE_RDP_AS1_SPEC_ENCODE_NOT_IMPLEMENTED');
+};
+
+/**
+ * Component Asn1Spec object
+ */
+function Asn1SpecExplicitTag(tag, spec) {
+	Asn1Spec.call(this, tag);
+	this.spec = spec;
+}
+
+inherits(Asn1SpecExplicitTag, Asn1Spec);
+
+/**
+ * Decode first header
+ * @param s {type.Stream}
+ * @param decoder
+ */
+Asn1Spec.prototype.decode = function(s, decoder) {
+	var specStream = new type.Stream(decoder.decode(s, this.tag).value);
+	this.spec.decode(specStream, decoder);
+};
+
+/**
+ * Module exports
+ */
+module.exports = {
+	TagClass : TagClass,
+	TagFormat : TagFormat,
+	Asn1Tag : Asn1Tag,
+	Asn1Spec : Asn1Spec,
+	Asn1SpecExplicitTag : Asn1SpecExplicitTag
+};