220 lines
11 KiB
HTML
220 lines
11 KiB
HTML
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<title>JSDoc: Source: packet/compressed.js</title>
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<h1 class="page-title">Source: 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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* Implementation of the Compressed Data Packet (Tag 8)<br/>
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* <br/>
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* {@link http://tools.ietf.org/html/rfc4880#section-5.6|RFC4880 5.6}: The Compressed Data packet contains compressed data. Typically,
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* this 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 packet.
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* @requires compression/jxg
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* @requires encoding/base64
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* @requires enums
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* @module packet/compressed
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*/
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module.exports = Compressed;
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var enums = require('../enums.js'),
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JXG = require('../compression/jxg.js'),
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base64 = require('../encoding/base64.js');
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/**
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* @constructor
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*/
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function Compressed() {
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/**
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* List of packets
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* @type {module:packet/packetlist}
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*/
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this.packets = null;
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/**
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* Compression algorithm
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* @type {compression}
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*/
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this.algorithm = 'uncompressed';
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/**
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* Compressed packet data
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* @type {String}
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*/
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this.compressed = null;
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}
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/**
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* Parsing function for the packet.
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* @param {String} bytes Payload of a tag 8 packet
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*/
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Compressed.prototype.read = function (bytes) {
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// One octet that gives the algorithm used to compress the packet.
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this.algorithm = enums.read(enums.compression, bytes.charCodeAt(0));
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// Compressed data, which makes up the remainder of the packet.
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this.compressed = bytes.substr(1);
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this.decompress();
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};
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/**
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* Return the compressed packet.
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* @return {String} binary compressed packet
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*/
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Compressed.prototype.write = function () {
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if (this.compressed === null)
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this.compress();
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return String.fromCharCode(enums.write(enums.compression, this.algorithm)) + this.compressed;
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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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*/
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Compressed.prototype.decompress = function () {
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var decompressed, compdata, radix;
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switch (this.algorithm) {
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case 'uncompressed':
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decompressed = this.compressed;
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break;
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case 'zip':
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compData = this.compressed;
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radix = base64.encode(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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decompressed = unescape(jxg_obj.deflate()[0][0]);
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break;
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case 'zlib':
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//RFC 1950. Bits 0-3 Compression Method
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var compressionMethod = this.compressed.charCodeAt(0) % 0x10;
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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
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// (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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compData = this.compressed.substring(0, this.compressed.length - 4);
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radix = base64.encode(compData).replace(/\n/g, "");
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//TODO check ADLER32 checksum
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decompressed = JXG.decompress(radix);
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break;
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} else {
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throw new Error("Compression algorithm ZLIB only supports " +
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"DEFLATE compression method.");
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}
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break;
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case 'bzip2':
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// TODO: need to implement this
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throw new Error('Compression algorithm BZip2 [BZ2] is not implemented.');
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default:
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throw new Error("Compression algorithm unknown :" + this.alogrithm);
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}
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this.packets.read(decompressed);
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};
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/**
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* Compress the packet data (member decompressedData)
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*/
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Compressed.prototype.compress = function () {
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switch (this.algorithm) {
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case 'uncompressed':
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// - Uncompressed
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this.compressed = this.packets.write();
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break;
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case 'zip':
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// - ZIP [RFC1951]
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throw new Error("Compression algorithm ZIP [RFC1951] is not implemented.");
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case 'zlib':
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// - ZLIB [RFC1950]
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// TODO: need to implement this
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throw new Error("Compression algorithm ZLIB [RFC1950] is not implemented.");
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case 'bzip2':
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// - BZip2 [BZ2]
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// TODO: need to implement this
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throw new Error("Compression algorithm BZip2 [BZ2] is not implemented.");
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default:
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throw new Error("Compression algorithm unknown :" + this.type);
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}
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};
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</code></pre>
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</article>
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</section>
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href="compressed.html">packet/compressed</a></li><li><a href="literal.html">packet/literal</a></li><li><a href="marker.html">packet/marker</a></li><li><a href="one_pass_signature.html">packet/one_pass_signature</a></li><li><a href="packet.html">packet/packet</a></li><li><a href="packetlist.html">packet/packetlist</a></li><li><a href="public_key_.html">packet/public_key</a></li><li><a href="public_key_encrypted_session_key.html">packet/public_key_encrypted_session_key</a></li><li><a href="public_subkey.html">packet/public_subkey</a></li><li><a href="secret_key.html">packet/secret_key</a></li><li><a href="secret_subkey.html">packet/secret_subkey</a></li><li><a href="signature_.html">packet/signature</a></li><li><a href="sym_encrypted_integrity_protected.html">packet/sym_encrypted_integrity_protected</a></li><li><a href="sym_encrypted_session_key.html">packet/sym_encrypted_session_key</a></li><li><a href="symmetrically_encrypted.html">packet/symmetrically_encrypted</a></li><li><a href="trust.html">packet/trust</a></li><li><a href="user_attribute.html">packet/user_attribute</a></li><li><a href="userid.html">packet/userid</a></li><li><a href="module-s2k.html">s2k</a></li><li><a href="keyid.html">type/keyid</a></li><li><a href="mpi.html">type/mpi</a></li><li><a href="s2k.html">type/s2k</a></li><li><a href="module-util.html">util</a></li><li><a href="util.html">util/util</a></li></ul><h3>Classes</h3><ul><li><a href="JXG.Util.html">JXG.Util</a></li><li><a href="module-cleartext-CleartextMessage.html">cleartext~CleartextMessage</a></li><li><a href="localStorage-LocalStorage.html">config/localStorage~LocalStorage</a></li><li><a href="keyring-Keyring.html">keyring/keyring~Keyring</a></li><li><a href="module-key-Key.html">key~Key</a></li><li><a href="module-key-SubKey.html">key~SubKey</a></li><li><a href="module-key-User.html">key~User</a></li><li><a href="module-message-Message.html">message~Message</a></li><li><a href="compressed-Compressed.html">packet/compressed~Compressed</a></li><li><a href="literal-Literal.html">packet/literal~Literal</a></li><li><a href="marker-Marker.html">packet/marker~Marker</a></li><li><a href="one_pass_signature-OnePassSignature.html">packet/one_pass_signature~OnePassSignature</a></li><li><a href="packetlist-Packetlist.html">packet/packetlist~Packetlist</a></li><li><a href="public_key_encrypted_session_key-PublicKeyEncryptedSessionKey.html">packet/public_key_encrypted_session_key~PublicKeyEncryptedSessionKey</a></li><li><a href="public_key-PublicKey.html">packet/public_key~PublicKey</a></li><li><a href="public_subkey-PublicSubkey.html">packet/public_subkey~PublicSubkey</a></li><li><a href="secret_key-SecretKey.html">packet/secret_key~SecretKey</a></li><li><a href="secret_subkey-SecretSubkey.html">packet/secret_subkey~SecretSubkey</a></li><li><a href="signature-Signature.html">packet/signature~Signature</a></li><li><a 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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0</a> on Mon Jan 06 2014 19:29:27 GMT+0100 (MEZ)
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