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141 lines
4.3 KiB
JavaScript
141 lines
4.3 KiB
JavaScript
// 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 3.0 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 Literal Data Packet (Tag 11)<br/>
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* <br/>
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* {@link http://tools.ietf.org/html/rfc4880#section-5.9|RFC4880 5.9}: A Literal Data packet contains the body of a message; data that
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* is not to be further interpreted.
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* @requires enums
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* @requires util
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* @module packet/literal
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*/
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'use strict';
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import util from '../util.js';
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import enums from '../enums.js';
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/**
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* @constructor
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*/
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export default function Literal() {
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this.tag = enums.packet.literal;
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this.format = 'utf8'; // default format for literal data packets
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this.date = new Date();
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this.data = new Uint8Array(0); // literal data representation
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this.filename = 'msg.txt';
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}
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/**
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* Set the packet data to a javascript native string, end of line
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* will be normalized to \r\n and by default text is converted to UTF8
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* @param {String} text Any native javascript string
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*/
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Literal.prototype.setText = function(text) {
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// normalize EOL to \r\n
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text = text.replace(/\r/g, '').replace(/\n/g, '\r\n');
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// encode UTF8
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this.data = this.format === 'utf8' ? util.str2Uint8Array(util.encode_utf8(text)) : util.str2Uint8Array(text);
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};
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/**
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* Returns literal data packets as native JavaScript string
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* with normalized end of line to \n
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* @return {String} literal data as text
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*/
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Literal.prototype.getText = function() {
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// decode UTF8
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var text = this.format === 'utf8' ? util.decode_utf8(util.Uint8Array2str(this.data)) : util.Uint8Array2str(this.data);
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// normalize EOL to \n
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return text.replace(/\r\n/g, '\n');
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};
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/**
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* Set the packet data to value represented by the provided string of bytes.
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* @param {Uint8Array} bytes The string of bytes
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* @param {utf8|binary|text} format The format of the string of bytes
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*/
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Literal.prototype.setBytes = function(bytes, format) {
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this.format = format;
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this.data = bytes;
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};
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/**
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* Get the byte sequence representing the literal packet data
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* @returns {Uint8Array} A sequence of bytes
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*/
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Literal.prototype.getBytes = function() {
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return this.data;
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};
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/**
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* Sets the filename of the literal packet data
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* @param {String} filename Any native javascript string
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*/
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Literal.prototype.setFilename = function(filename) {
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this.filename = filename;
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};
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/**
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* Get the filename of the literal packet data
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* @returns {String} filename
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*/
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Literal.prototype.getFilename = function() {
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return this.filename;
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};
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/**
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* Parsing function for a literal data packet (tag 11).
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*
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* @param {Uint8Array} input Payload of a tag 11 packet
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* @return {module:packet/literal} object representation
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*/
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Literal.prototype.read = function(bytes) {
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// - A one-octet field that describes how the data is formatted.
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var format = enums.read(enums.literal, bytes[0]);
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var filename_len = bytes[1];
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this.filename = util.decode_utf8(util.Uint8Array2str(bytes.subarray(2, 2 + filename_len)));
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this.date = util.readDate(bytes.subarray(2 + filename_len, 2 + filename_len + 4));
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var data = bytes.subarray(6 + filename_len, bytes.length);
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this.setBytes(data, format);
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};
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/**
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* Creates a string representation of the packet
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*
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* @return {Uint8Array} Uint8Array representation of the packet
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*/
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Literal.prototype.write = function() {
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var filename = util.str2Uint8Array(util.encode_utf8(this.filename));
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var filename_length = new Uint8Array([filename.length]);
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var format = new Uint8Array([enums.write(enums.literal, this.format)]);
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var date = util.writeDate(this.date);
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var data = this.getBytes();
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return util.concatUint8Array([format, filename_length, filename, date, data]);
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};
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