214 lines
12 KiB
HTML
214 lines
12 KiB
HTML
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<title>JSDoc: Source: packet/openpgp.packet.compressed.js</title>
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<h1 class="page-title">Source: packet/openpgp.packet.compressed.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/**
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* @class
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* @classdesc Implementation of the Compressed Data Packet (Tag 8)
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*
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* RFC4880 5.6:
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* The Compressed Data packet contains compressed data. Typically, this
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* packet is found as the contents of an encrypted packet, or following
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* a Signature or One-Pass Signature packet, and contains a literal data
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* packet.
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*/
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function openpgp_packet_compressed() {
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this.tagType = 8;
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this.decompressedData = null;
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/**
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* Parsing function for the packet.
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* @param {String} input Payload of a tag 8 packet
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* @param {Integer} position Position to start reading from the input string
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* @param {Integer} len Length of the packet or the remaining length of
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* input at position
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* @return {openpgp_packet_compressed} Object representation
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*/
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function read_packet (input, position, len) {
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this.packetLength = len;
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var mypos = position;
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// One octet that gives the algorithm used to compress the packet.
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this.type = input.charCodeAt(mypos++);
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// Compressed data, which makes up the remainder of the packet.
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this.compressedData = input.substring(position+1, position+len);
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return this;
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}
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/**
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* Decompression method for decompressing the compressed data
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* read by read_packet
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* @return {String} The decompressed data
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*/
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function decompress() {
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if (this.decompressedData != null)
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return this.decompressedData;
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if (this.type == null)
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return null;
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switch (this.type) {
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case 0: // - Uncompressed
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this.decompressedData = this.compressedData;
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break;
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case 1: // - ZIP [RFC1951]
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util.print_info('Decompressed packet [Type 1-ZIP]: ' + this.toString());
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var compData = this.compressedData;
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var radix = s2r(compData).replace(/\n/g,"");
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// no header in this case, directly call deflate
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var jxg_obj = new JXG.Util.Unzip(JXG.Util.Base64.decodeAsArray(radix));
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this.decompressedData = unescape(jxg_obj.deflate()[0][0]);
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break;
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case 2: // - ZLIB [RFC1950]
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util.print_info('Decompressed packet [Type 2-ZLIB]: ' + this.toString());
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var compressionMethod = this.compressedData.charCodeAt(0) % 0x10; //RFC 1950. Bits 0-3 Compression Method
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//Bits 4-7 RFC 1950 are LZ77 Window. Generally this value is 7 == 32k window size.
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//2nd Byte in RFC 1950 is for "FLAGs" Allows for a Dictionary (how is this defined). Basic checksum, and compression level.
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if (compressionMethod == 8) { //CM 8 is for DEFLATE, RFC 1951
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// remove 4 bytes ADLER32 checksum from the end
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var compData = this.compressedData.substring(0, this.compressedData.length - 4);
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var radix = s2r(compData).replace(/\n/g,"");
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//TODO check ADLER32 checksum
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this.decompressedData = JXG.decompress(radix);
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break;
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} else {
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util.print_error("Compression algorithm ZLIB only supports DEFLATE compression method.");
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}
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break;
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case 3: // - BZip2 [BZ2]
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// TODO: need to implement this
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util.print_error("Compression algorithm BZip2 [BZ2] is not implemented.");
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break;
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default:
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util.print_error("Compression algorithm unknown :"+this.type);
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break;
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}
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util.print_debug("decompressed:"+util.hexstrdump(this.decompressedData));
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return this.decompressedData;
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}
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/**
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* Compress the packet data (member decompressedData)
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* @param {Integer} type Algorithm to be used // See RFC 4880 9.3
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* @param {String} data Data to be compressed
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* @return {String} The compressed data stored in attribute compressedData
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*/
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function compress(type, data) {
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this.type = type;
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this.decompressedData = data;
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switch (this.type) {
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case 0: // - Uncompressed
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this.compressedData = this.decompressedData;
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break;
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case 1: // - ZIP [RFC1951]
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util.print_error("Compression algorithm ZIP [RFC1951] is not implemented.");
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break;
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case 2: // - ZLIB [RFC1950]
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// TODO: need to implement this
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util.print_error("Compression algorithm ZLIB [RFC1950] is not implemented.");
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break;
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case 3: // - BZip2 [BZ2]
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// TODO: need to implement this
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util.print_error("Compression algorithm BZip2 [BZ2] is not implemented.");
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break;
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default:
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util.print_error("Compression algorithm unknown :"+this.type);
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break;
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}
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this.packetLength = this.compressedData.length +1;
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return this.compressedData;
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}
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/**
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* Creates a string representation of the packet
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* @param {Integer} algorithm Algorithm to be used // See RFC 4880 9.3
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* @param {String} data Data to be compressed
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* @return {String} String-representation of the packet
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*/
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function write_packet(algorithm, data) {
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this.decompressedData = data;
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if (algorithm == null) {
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this.type = 1;
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}
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var result = String.fromCharCode(this.type)+this.compress(this.type);
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return openpgp_packet.write_packet_header(8, result.length)+result;
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}
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/**
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* Pretty printing the packet (useful for debug purposes)
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* @return {String}
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*/
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function toString() {
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return '5.6. Compressed Data Packet (Tag 8)\n'+
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' length: '+this.packetLength+'\n'+
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' Compression Algorithm = '+this.type+'\n'+
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' Compressed Data: Byte ['+util.hexstrdump(this.compressedData)+']\n';
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}
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this.read_packet = read_packet;
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this.toString = toString;
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this.compress = compress;
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this.decompress = decompress;
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this.write_packet = write_packet;
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};
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</code></pre>
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</article>
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</section>
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<h2><a href="index.html">Index</a></h2><h3>Classes</h3><ul><li><a href="_openpgp_packet.html">_openpgp_packet</a></li><li><a href="JXG.Util.html">Util</a></li><li><a href="openpgp.html">openpgp</a></li><li><a href="openpgp_config.html">openpgp_config</a></li><li><a href="openpgp_keyring.html">openpgp_keyring</a></li><li><a href="openpgp_msg_message.html">openpgp_msg_message</a></li><li><a href="openpgp_msg_privatekey.html">openpgp_msg_privatekey</a></li><li><a href="openpgp_msg_publickey.html">openpgp_msg_publickey</a></li><li><a href="openpgp_packet_compressed.html">openpgp_packet_compressed</a></li><li><a href="openpgp_packet_encrypteddata.html">openpgp_packet_encrypteddata</a></li><li><a href="openpgp_packet_encryptedintegrityprotecteddata.html">openpgp_packet_encryptedintegrityprotecteddata</a></li><li><a href="openpgp_packet_encryptedsessionkey.html">openpgp_packet_encryptedsessionkey</a></li><li><a href="openpgp_packet_keymaterial.html">openpgp_packet_keymaterial</a></li><li><a href="openpgp_packet_literaldata.html">openpgp_packet_literaldata</a></li><li><a href="openpgp_packet_marker.html">openpgp_packet_marker</a></li><li><a href="openpgp_packet_modificationdetectioncode.html">openpgp_packet_modificationdetectioncode</a></li><li><a href="openpgp_packet_onepasssignature.html">openpgp_packet_onepasssignature</a></li><li><a href="openpgp_packet_signature.html">openpgp_packet_signature</a></li><li><a href="openpgp_packet_userattribute.html">openpgp_packet_userattribute</a></li><li><a href="openpgp_packet_userid.html">openpgp_packet_userid</a></li><li><a href="openpgp_type_keyid.html">openpgp_type_keyid</a></li><li><a href="openpgp_type_mpi.html">openpgp_type_mpi</a></li><li><a href="openpgp_type_s2k.html">openpgp_type_s2k</a></li></ul><h3>Global</h3><ul><li><a href="global.html#bin2str">bin2str</a></li><li><a href="global.html#calc_checksum">calc_checksum</a></li><li><a href="global.html#crc_table">crc_table</a></li><li><a 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href="global.html#openpgp_crypto_generateSessionKey">openpgp_crypto_generateSessionKey</a></li><li><a href="global.html#openpgp_crypto_getHashByteLength">openpgp_crypto_getHashByteLength</a></li><li><a href="global.html#openpgp_crypto_getPrefixRandom">openpgp_crypto_getPrefixRandom</a></li><li><a href="global.html#openpgp_crypto_getPseudoRandom">openpgp_crypto_getPseudoRandom</a></li><li><a href="global.html#openpgp_crypto_getRandomBigInteger">openpgp_crypto_getRandomBigInteger</a></li><li><a href="global.html#openpgp_crypto_getRandomBytes">openpgp_crypto_getRandomBytes</a></li><li><a href="global.html#openpgp_crypto_getSecureRandom">openpgp_crypto_getSecureRandom</a></li><li><a href="global.html#openpgp_crypto_hashData">openpgp_crypto_hashData</a></li><li><a href="global.html#openpgp_crypto_MDCSystemBytes">openpgp_crypto_MDCSystemBytes</a></li><li><a href="global.html#openpgp_crypto_signData">openpgp_crypto_signData</a></li><li><a href="global.html#openpgp_crypto_symmetricDecrypt">openpgp_crypto_symmetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_symmetricEncrypt">openpgp_crypto_symmetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_verifySignature">openpgp_crypto_verifySignature</a></li><li><a href="global.html#openpgp_encoding_armor">openpgp_encoding_armor</a></li><li><a href="global.html#openpgp_encoding_armor_addheader">openpgp_encoding_armor_addheader</a></li><li><a href="global.html#openpgp_encoding_base64_decode">openpgp_encoding_base64_decode</a></li><li><a href="global.html#openpgp_encoding_base64_encode">openpgp_encoding_base64_encode</a></li><li><a href="global.html#openpgp_encoding_deArmor">openpgp_encoding_deArmor</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_decode">openpgp_encoding_eme_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_encode">openpgp_encoding_eme_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_decode">openpgp_encoding_emsa_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_encode">openpgp_encoding_emsa_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_html_encode">openpgp_encoding_html_encode</a></li><li><a href="global.html#print_debug">print_debug</a></li><li><a href="global.html#print_debug_hexstr_dump">print_debug_hexstr_dump</a></li><li><a href="global.html#print_error">print_error</a></li><li><a href="global.html#print_info">print_info</a></li><li><a href="global.html#shiftRight">shiftRight</a></li><li><a href="global.html#str2bin">str2bin</a></li><li><a href="global.html#str2Uint8Array">str2Uint8Array</a></li><li><a href="global.html#Uint8Array2str">Uint8Array2str</a></li><li><a href="global.html#util">util</a></li><li><a href="global.html#verifyCheckSum">verifyCheckSum</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0-dev</a> on Fri Apr 12 2013 14:20:33 GMT+0200 (CEST)
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