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<h1 class="page-title">Source: packet/literal.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* Implementation of the Literal Data Packet (Tag 11)<br/>
* <br/>
* {@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
* is not to be further interpreted.
* @requires enums
* @requires util
* @module packet/literal
*/
module.exports = Literal;
var util = require('../util.js'),
enums = require('../enums.js');
/**
* @constructor
*/
function Literal() {
this.format = 'utf8'; // default format for literal data packets
this.data = ''; // literal data representation as native JavaScript string or bytes
this.date = new Date();
}
/**
* Set the packet data to a javascript native string, end of line
* will be normalized to \r\n and by default text is converted to UTF8
* @param {String} text Any native javascript string
*/
Literal.prototype.setText = function (text) {
// normalize EOL to \r\n
text = text.replace(/\r/g, '').replace(/\n/g, '\r\n');
// encode UTF8
this.data = this.format == 'utf8' ? util.encode_utf8(text) : text;
};
/**
* Returns literal data packets as native JavaScript string
* with normalized end of line to \n
* @return {String} literal data as text
*/
Literal.prototype.getText = function () {
// decode UTF8
var text = util.decode_utf8(this.data);
// normalize EOL to \n
return text.replace(/\r\n/g, '\n');
};
/**
* Set the packet data to value represented by the provided string of bytes.
* @param {String} bytes The string of bytes
* @param {utf8|binary|text} format The format of the string of bytes
*/
Literal.prototype.setBytes = function (bytes, format) {
this.format = format;
this.data = bytes;
};
/**
* Get the byte sequence representing the literal packet data
* @returns {String} A sequence of bytes
*/
Literal.prototype.getBytes = function () {
return this.data;
};
/**
* Parsing function for a literal data packet (tag 11).
*
* @param {String} input Payload of a tag 11 packet
* @param {Integer} position
* Position to start reading from the input string
* @param {Integer} len
* Length of the packet or the remaining length of
* input at position
* @return {module:packet/literal} object representation
*/
Literal.prototype.read = function (bytes) {
// - A one-octet field that describes how the data is formatted.
var format = enums.read(enums.literal, bytes.charCodeAt(0));
var filename_len = bytes.charCodeAt(1);
this.filename = util.decode_utf8(bytes.substr(2, filename_len));
this.date = util.readDate(bytes.substr(2 + filename_len, 4));
var data = bytes.substring(6 + filename_len);
this.setBytes(data, format);
};
/**
* Creates a string representation of the packet
*
* @param {String} data The data to be inserted as body
* @return {String} string-representation of the packet
*/
Literal.prototype.write = function () {
var filename = util.encode_utf8("msg.txt");
var data = this.getBytes();
var result = '';
result += String.fromCharCode(enums.write(enums.literal, this.format));
result += String.fromCharCode(filename.length);
result += filename;
result += util.writeDate(this.date);
result += data;
return result;
};
</code></pre>
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