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   1  <?php
   2  /**
   3   * PHPExcel
   4   *
   5   * Copyright (c) 2006 - 2012 PHPExcel
   6   *
   7   * This library is free software; you can redistribute it and/or
   8   * modify it under the terms of the GNU Lesser General Public
   9   * License as published by the Free Software Foundation; either
  10   * version 2.1 of the License, or (at your option) any later version.
  11   *
  12   * This library is distributed in the hope that it will be useful,
  13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15   * Lesser General Public License for more details.
  16   *
  17   * You should have received a copy of the GNU Lesser General Public
  18   * License along with this library; if not, write to the Free Software
  19   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20   *
  21   * @category   PHPExcel
  22   * @package    PHPExcel_Shared
  23   * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
  24   * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
  25   * @version    1.7.7, 2012-05-19
  26   */
  27  
  28  
  29  /**
  30   * PHPExcel_Shared_ZipStreamWrapper
  31   *
  32   * @category   PHPExcel
  33   * @package    PHPExcel_Shared
  34   * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
  35   */
  36  class PHPExcel_Shared_ZipStreamWrapper {
  37      /**
  38       * Internal ZipAcrhive
  39       *
  40       * @var ZipAcrhive
  41       */
  42      private $_archive;
  43  
  44      /**
  45       * Filename in ZipAcrhive
  46       *
  47       * @var string
  48       */
  49      private $_fileNameInArchive = '';
  50  
  51      /**
  52       * Position in file
  53       *
  54       * @var int
  55       */
  56      private $_position = 0;
  57  
  58      /**
  59       * Data
  60       *
  61       * @var mixed
  62       */
  63      private $_data = '';
  64  
  65      /**
  66       * Register wrapper
  67       */
  68      public static function register() {
  69          @stream_wrapper_unregister("zip");
  70          @stream_wrapper_register("zip", __CLASS__);
  71      }
  72  
  73      /**
  74       * Implements support for fopen().
  75       *
  76       * @param    string    $path            resource name including scheme, e.g.
  77       * @param    string    $mode            only "r" is supported
  78       * @param    int        $options        mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH
  79       * @param    string  &$openedPath    absolute path of the opened stream (out parameter)
  80       * @return    bool    true on success
  81       */
  82      public function stream_open($path, $mode, $options, &$opened_path) {
  83          // Check for mode
  84          if ($mode{0} != 'r') {
  85              throw new Exception('Mode ' . $mode . ' is not supported. Only read mode is supported.');
  86          }
  87  
  88          $pos = strrpos($path, '#');
  89          $url['host'] = substr($path, 6, $pos - 6); // 6: strlen('zip://')
  90          $url['fragment'] = substr($path, $pos + 1);
  91  
  92          // Open archive
  93          $this->_archive = new ZipArchive();
  94          $this->_archive->open($url['host']);
  95  
  96          $this->_fileNameInArchive = $url['fragment'];
  97          $this->_position = 0;
  98          $this->_data = $this->_archive->getFromName( $this->_fileNameInArchive );
  99  
 100          return true;
 101      }
 102  
 103      /**
 104       * Implements support for fstat().
 105       *
 106       * @return  boolean
 107       */
 108      public function stream_stat() {
 109          return $this->_archive->statName( $this->_fileNameInArchive );
 110      }
 111  
 112      /**
 113       * Implements support for fread(), fgets() etc.
 114       *
 115       * @param   int        $count    maximum number of bytes to read
 116       * @return  string
 117       */
 118      function stream_read($count) {
 119          $ret = substr($this->_data, $this->_position, $count);
 120          $this->_position += strlen($ret);
 121          return $ret;
 122      }
 123  
 124      /**
 125       * Returns the position of the file pointer, i.e. its offset into the file
 126       * stream. Implements support for ftell().
 127       *
 128       * @return  int
 129       */
 130      public function stream_tell() {
 131          return $this->_position;
 132      }
 133  
 134      /**
 135       * EOF stream
 136       *
 137       * @return    bool
 138       */
 139      public function stream_eof() {
 140          return $this->_position >= strlen($this->_data);
 141      }
 142  
 143      /**
 144       * Seek stream
 145       *
 146       * @param    int        $offset    byte offset
 147       * @param    int        $whence    SEEK_SET, SEEK_CUR or SEEK_END
 148       * @return    bool
 149       */
 150      public function stream_seek($offset, $whence) {
 151          switch ($whence) {
 152              case SEEK_SET:
 153                  if ($offset < strlen($this->_data) && $offset >= 0) {
 154                       $this->_position = $offset;
 155                       return true;
 156                  } else {
 157                       return false;
 158                  }
 159                  break;
 160  
 161              case SEEK_CUR:
 162                  if ($offset >= 0) {
 163                       $this->_position += $offset;
 164                       return true;
 165                  } else {
 166                       return false;
 167                  }
 168                  break;
 169  
 170              case SEEK_END:
 171                  if (strlen($this->_data) + $offset >= 0) {
 172                       $this->_position = strlen($this->_data) + $offset;
 173                       return true;
 174                  } else {
 175                       return false;
 176                  }
 177                  break;
 178  
 179              default:
 180                  return false;
 181          }
 182      }
 183  }