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[hub.git] / application / hub / main / streams / raw_data / input / class_RawDataInputStream.php
1 <?php
2 /**
3  * A RawDataInputStream class
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009  Developer Team
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  */
24 class RawDataInputStream extends BaseStream implements InputStreamable {
25         /**
26          * Protected constructor
27          *
28          * @return      void
29          */
30         protected function __construct () {
31                 // Call parent constructor
32                 parent::__construct(__CLASS__);
33         }
34
35         /**
36          * Creates an instance of this node class
37          *
38          * @return      $streamInstance         An instance of this node class
39          */
40         public final static function createRawDataInputStream () {
41                 // Get a new instance
42                 $streamInstance = new RawDataInputStream();
43
44                 // Set the handler instance
45                 $streamInstance->setHandlerInstance($handlerInstance);
46
47                 // Return the instance
48                 return $streamInstance;
49         }
50
51         /**
52          * Streams the data and maybe does something to it
53          *
54          * @param       $data   The data (string mostly) to "stream"
55          * @return      $data   The data (string mostly) to "stream"
56          * @todo        Do we need to do something more here?
57          */
58         public function streamData ($data) {
59                 // Do we have start and end marker again?
60                 assert($this->ifStartEndMarkerSet($data));
61
62                 // Remove both
63                 $data = substr($data, strlen(BaseRawDataHandler::STREAM_START_MARKER), -1 * strlen(BaseRawDataHandler::STREAM_END_MARKER));
64
65                 // Can it be validated?
66                 if ((strlen($data) % 4) != 0) {
67                         // Length modulo 4 must be zero, else it is an invalid Base64 message
68                         $handlerInstance->setErrorCode(BaseRawDataHandler::SOCKET_ERROR_INVALID_BASE64_MODULO);
69                         $data = false;
70                 } elseif (!$this->isBase64Encoded($data)) {
71                         // Is not a valid Base64-encoded message
72                         $handlerInstance->setErrorCode(BaseRawDataHandler::SOCKET_ERROR_INVALID_BASE64_MESSAGE);
73                         $data = false;
74                 } else {
75                         // Decode the data with BASE64-encoding
76                         $data = base64_decode($data);
77                 }
78
79                 // Return it
80                 return $data;
81         }
82 }
83
84 // [EOF]
85 ?>