<?php

/**
 * PHPExcel_Shared_ZipStreamWrapper
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * 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
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
class PHPExcel_Shared_ZipStreamWrapper
{
  /**
   * Internal ZipAcrhive
   *
   * @var ZipArchive
   */
  private $archive;
  
  /**
   * Filename in ZipAcrhive
   *
   * @var string
   */
  private $fileNameInArchive = '';
  
  /**
   * Position in file
   *
   * @var int
   */
  private $position = 0;
  
  /**
   * Data
   *
   * @var mixed
   */
  private $data = '';
  
  /**
   * Register wrapper
   */
  public static function register()
  {
    @stream_wrapper_unregister ( 'zip' );
    @stream_wrapper_register ( 'zip', __CLASS__ );
  }
  
  /**
   * Implements support for fopen().
   *
   * @param string $path
   *          resource name including scheme, e.g.
   * @param string $mode
   *          only "r" is supported
   * @param int $options
   *          mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH
   * @param
   *          string &$openedPath absolute path of the opened stream (out parameter)
   * @return bool true on success
   */
  public function stream_open($path, $mode, $options, &$opened_path)
  {
    // Check for mode
    if ($mode {0} != 'r')
    {
      throw new PHPExcel_Reader_Exception ( 'Mode ' . $mode . ' is not supported. Only read mode is supported.' );
    }
    
    $pos = strrpos ( $path, '#' );
    $url ['host'] = substr ( $path, 6, $pos - 6 ); // 6: strlen('zip://')
    $url ['fragment'] = substr ( $path, $pos + 1 );
    
    // Open archive
    $this->archive = new ZipArchive ();
    $this->archive->open ( $url ['host'] );
    
    $this->fileNameInArchive = $url ['fragment'];
    $this->position = 0;
    $this->data = $this->archive->getFromName ( $this->fileNameInArchive );
    
    return true;
  }
  
  /**
   * Implements support for fstat().
   *
   * @return boolean
   */
  public function statName()
  {
    return $this->fileNameInArchive;
  }
  
  /**
   * Implements support for fstat().
   *
   * @return boolean
   */
  public function url_stat()
  {
    return $this->statName ( $this->fileNameInArchive );
  }
  
  /**
   * Implements support for fstat().
   *
   * @return boolean
   */
  public function stream_stat()
  {
    return $this->archive->statName ( $this->fileNameInArchive );
  }
  
  /**
   * Implements support for fread(), fgets() etc.
   *
   * @param int $count
   *          maximum number of bytes to read
   * @return string
   */
  public function stream_read($count)
  {
    $ret = substr ( $this->data, $this->position, $count );
    $this->position += strlen ( $ret );
    return $ret;
  }
  
  /**
   * Returns the position of the file pointer, i.e.
   * its offset into the file
   * stream. Implements support for ftell().
   *
   * @return int
   */
  public function stream_tell()
  {
    return $this->position;
  }
  
  /**
   * EOF stream
   *
   * @return bool
   */
  public function stream_eof()
  {
    return $this->position >= strlen ( $this->data );
  }
  
  /**
   * Seek stream
   *
   * @param int $offset
   *          byte offset
   * @param int $whence
   *          SEEK_SET, SEEK_CUR or SEEK_END
   * @return bool
   */
  public function stream_seek($offset, $whence)
  {
    switch ($whence)
    {
      case SEEK_SET :
        if ($offset < strlen ( $this->data ) && $offset >= 0)
        {
          $this->position = $offset;
          return true;
        }
        else
        {
          return false;
        }
        break;
      case SEEK_CUR :
        if ($offset >= 0)
        {
          $this->position += $offset;
          return true;
        }
        else
        {
          return false;
        }
        break;
      case SEEK_END :
        if (strlen ( $this->data ) + $offset >= 0)
        {
          $this->position = strlen ( $this->data ) + $offset;
          return true;
        }
        else
        {
          return false;
        }
        break;
      default :
        return false;
    }
  }
}
