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