// 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 strange "Marker packet" (Tag 10)<br/>
 * <br/>
 * RFC4880 5.8: An experimental version of PGP used this packet as the Literal
 * packet, but no released version of PGP generated Literal packets with this
 * tag. With PGP 5.x, this packet has been reassigned and is reserved for use as
 * the Marker packet.<br/>
 * <br/>
 * Such a packet MUST be ignored when received.
 * @module packet/marker
 */

/**
 * @constructor
 */
module.exports = function () {
  /**
   * Parsing function for a literal data packet (tag 10).
   * 
   * @param {String} input Payload of a tag 10 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/marker} Object representation
   */
  this.read = function(bytes) {
    if (bytes.charCodeAt(0) == 0x50 && // P
    bytes.charCodeAt(1) == 0x47 && // G
    bytes.charCodeAt(2) == 0x50) // P
      return true;
    // marker packet does not contain "PGP"
    return false;
  }
}