system.tar.inc

<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * File::CSV
 *
 * PHP versions 4 and 5
 *
 * Copyright (c) 1997-2008,
 * Vincent Blavet <vincent@phpconcept.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category  File_Formats
 * @package   Archive_Tar
 * @author    Vincent Blavet <vincent@phpconcept.net>
 * @copyright 1997-2010 The Authors
 * @license   http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @version   CVS: $Id$
 * @link      http://pear.php.net/package/Archive_Tar
 */

/**
 * Note on Drupal 8 porting.
 * This file origin is Tar.php, release 1.4.0 (stable) with some code
 * from PEAR.php, release 1.9.5 (stable) both at http://pear.php.net.
 * To simplify future porting from pear of this file, you should not
 * do cosmetic or other non significant changes to this file.
 * The following changes have been done:
 *  Added namespace Drupal\Core\Archiver.
 *  Removed require_once 'PEAR.php'.
 *  Added defintion of OS_WINDOWS taken from PEAR.php.
 *  Renamed class to ArchiveTar.
 *  Removed extends PEAR from class.
 *  Removed call parent:: __construct().
 *  Changed PEAR::loadExtension($extname) to this->loadExtension($extname).
 *  Added function loadExtension() taken from PEAR.php.
 *  Changed all calls of unlink() to drupal_unlink().
 *  Changed $this->error_object = &$this->raiseError($p_message)
 *  to throw new \Exception($p_message).
 */

/**
 * Note on Drupal 7 backporting from Drupal 8.
 * File origin is core/lib/Drupal/Core/Archiver/ArchiveTar.php from Drupal 8.
 * The following changes have been done:
 *  Removed namespace Drupal\Core\Archiver.
 *  Renamed class to Archive_Tar.
 *  Changed \Exception to Exception.
 */

// Drupal removal require_once 'PEAR.php'.
// Drupal addition OS_WINDOWS as defined in PEAR.php.
if (substr(PHP_OS, 0, 3) == 'WIN') {
  define('OS_WINDOWS', true);
}
else {
  define('OS_WINDOWS', false);
}
define('ARCHIVE_TAR_ATT_SEPARATOR', 90001);
define('ARCHIVE_TAR_END_BLOCK', pack("a512", ''));
if (!function_exists('gzopen') && function_exists('gzopen64')) {
  function gzopen($filename, $mode, $use_include_path = 0) {
    return gzopen64($filename, $mode, $use_include_path);
  }
}
if (!function_exists('gztell') && function_exists('gztell64')) {
  function gztell($zp) {
    return gztell64($zp);
  }
}
if (!function_exists('gzseek') && function_exists('gzseek64')) {
  function gzseek($zp, $offset, $whence = SEEK_SET) {
    return gzseek64($zp, $offset, $whence);
  }
}

/**
 * Creates a (compressed) Tar archive
 *
 * @package Archive_Tar
 * @author  Vincent Blavet <vincent@phpconcept.net>
 * @license http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @version $Revision$
 */

// Drupal change class Archive_Tar extends PEAR.
class Archive_Tar {

  /**
   * @var string Name of the Tar
   */
  public $_tarname = '';

  /**
   * @var boolean if true, the Tar file will be gzipped
   */
  public $_compress = false;

  /**
   * @var string Type of compression : 'none', 'gz', 'bz2' or 'lzma2'
   */
  public $_compress_type = 'none';

  /**
   * @var string Explode separator
   */
  public $_separator = ' ';

  /**
   * @var file descriptor
   */
  public $_file = 0;

  /**
   * @var string Local Tar name of a remote Tar (http:// or ftp://)
   */
  public $_temp_tarname = '';

  /**
   * @var string regular expression for ignoring files or directories
   */
  public $_ignore_regexp = '';

  /**
   * @var object PEAR_Error object
   */
  public $error_object = null;

  /**
   * Archive_Tar Class constructor. This flavour of the constructor only
   * declare a new Archive_Tar object, identifying it by the name of the
   * tar file.
   * If the compress argument is set the tar will be read or created as a
   * gzip or bz2 compressed TAR file.
   *
   * @param string $p_tarname The name of the tar archive to create
   * @param string $p_compress can be null, 'gz', 'bz2' or 'lzma2'. This
   *               parameter indicates if gzip, bz2 or lzma2 compression
   *               is required.  For compatibility reason the
   *               boolean value 'true' means 'gz'.
   *
   * @return bool
   */
  public function __construct($p_tarname, $p_compress = null) {

    // Drupal removal parent::__construct().
    $this->_compress = false;
    $this->_compress_type = 'none';
    if ($p_compress === null || $p_compress == '') {
      if (@file_exists($p_tarname)) {
        if ($fp = @fopen($p_tarname, "rb")) {

          // look for gzip magic cookie
          $data = fread($fp, 2);
          fclose($fp);
          if ($data == "") {
            $this->_compress = true;
            $this->_compress_type = 'gz';

            // No sure it's enought for a magic code ....
          }
          elseif ($data == "BZ") {
            $this->_compress = true;
            $this->_compress_type = 'bz2';
          }
          elseif (file_get_contents($p_tarname, false, null, 1, 4) == '7zXZ') {
            $this->_compress = true;
            $this->_compress_type = 'lzma2';
          }
        }
      }
      else {

        // probably a remote file or some file accessible
        // through a stream interface
        if (substr($p_tarname, -2) == 'gz') {
          $this->_compress = true;
          $this->_compress_type = 'gz';
        }
        elseif (substr($p_tarname, -3) == 'bz2' || substr($p_tarname, -2) == 'bz') {
          $this->_compress = true;
          $this->_compress_type = 'bz2';
        }
        else {
          if (substr($p_tarname, -2) == 'xz') {
            $this->_compress = true;
            $this->_compress_type = 'lzma2';
          }
        }
      }
    }
    else {
      if ($p_compress === true || $p_compress == 'gz') {
        $this->_compress = true;
        $this->_compress_type = 'gz';
      }
      else {
        if ($p_compress == 'bz2') {
          $this->_compress = true;
          $this->_compress_type = 'bz2';
        }
        else {
          if ($p_compress == 'lzma2') {
            $this->_compress = true;
            $this->_compress_type = 'lzma2';
          }
          else {
            $this
              ->_error("Unsupported compression type '{$p_compress}'\n" . "Supported types are 'gz', 'bz2' and 'lzma2'.\n");
            return false;
          }
        }
      }
    }
    $this->_tarname = $p_tarname;
    if ($this->_compress) {

      // assert zlib or bz2 or xz extension support
      if ($this->_compress_type == 'gz') {
        $extname = 'zlib';
      }
      else {
        if ($this->_compress_type == 'bz2') {
          $extname = 'bz2';
        }
        else {
          if ($this->_compress_type == 'lzma2') {
            $extname = 'xz';
          }
        }
      }
      if (!extension_loaded($extname)) {

        // Drupal change PEAR::loadExtension($extname).
        $this
          ->loadExtension($extname);
      }
      if (!extension_loaded($extname)) {
        $this
          ->_error("The extension '{$extname}' couldn't be found.\n" . "Please make sure your version of PHP was built " . "with '{$extname}' support.\n");
        return false;
      }
    }
  }
  public function __destruct() {
    $this
      ->_close();

    // ----- Look for a local copy to delete
    if ($this->_temp_tarname != '') {
      @drupal_unlink($this->_temp_tarname);
    }
  }

  // Drupal addition from PEAR.php.

  /**
   * OS independent PHP extension load. Remember to take care
   * on the correct extension name for case sensitive OSes.
   *
   * @param string $ext The extension name
   * @return bool Success or not on the dl() call
   */
  function loadExtension($ext) {
    if (extension_loaded($ext)) {
      return true;
    }

    // if either returns true dl() will produce a FATAL error, stop that
    if (function_exists('dl') === false || ini_get('enable_dl') != 1 || ini_get('safe_mode') == 1) {
      return false;
    }
    if (OS_WINDOWS) {
      $suffix = '.dll';
    }
    elseif (PHP_OS == 'HP-UX') {
      $suffix = '.sl';
    }
    elseif (PHP_OS == 'AIX') {
      $suffix = '.a';
    }
    elseif (PHP_OS == 'OSX') {
      $suffix = '.bundle';
    }
    else {
      $suffix = '.so';
    }
    return @dl('php_' . $ext . $suffix) || @dl($ext . $suffix);
  }

  /**
   * This method creates the archive file and add the files / directories
   * that are listed in $p_filelist.
   * If a file with the same name exist and is writable, it is replaced
   * by the new tar.
   * The method return false and a PEAR error text.
   * The $p_filelist parameter can be an array of string, each string
   * representing a filename or a directory name with their path if
   * needed. It can also be a single string with names separated by a
   * single blank.
   * For each directory added in the archive, the files and
   * sub-directories are also added.
   * See also createModify() method for more details.
   *
   * @param array $p_filelist An array of filenames and directory names, or a
   *              single string with names separated by a single
   *              blank space.
   *
   * @return true on success, false on error.
   * @see    createModify()
   */
  public function create($p_filelist) {
    return $this
      ->createModify($p_filelist, '', '');
  }

  /**
   * This method add the files / directories that are listed in $p_filelist in
   * the archive. If the archive does not exist it is created.
   * The method return false and a PEAR error text.
   * The files and directories listed are only added at the end of the archive,
   * even if a file with the same name is already archived.
   * See also createModify() method for more details.
   *
   * @param array $p_filelist An array of filenames and directory names, or a
   *              single string with names separated by a single
   *              blank space.
   *
   * @return true on success, false on error.
   * @see    createModify()
   * @access public
   */
  public function add($p_filelist) {
    return $this
      ->addModify($p_filelist, '', '');
  }

  /**
   * @param string $p_path
   * @param bool $p_preserve
   * @return bool
   */
  public function extract($p_path = '', $p_preserve = false) {
    return $this
      ->extractModify($p_path, '', $p_preserve);
  }

  /**
   * @return array|int
   */
  public function listContent() {
    $v_list_detail = array();
    if ($this
      ->_openRead()) {
      if (!$this
        ->_extractList('', $v_list_detail, "list", '', '')) {
        unset($v_list_detail);
        $v_list_detail = 0;
      }
      $this
        ->_close();
    }
    return $v_list_detail;
  }

  /**
   * This method creates the archive file and add the files / directories
   * that are listed in $p_filelist.
   * If the file already exists and is writable, it is replaced by the
   * new tar. It is a create and not an add. If the file exists and is
   * read-only or is a directory it is not replaced. The method return
   * false and a PEAR error text.
   * The $p_filelist parameter can be an array of string, each string
   * representing a filename or a directory name with their path if
   * needed. It can also be a single string with names separated by a
   * single blank.
   * The path indicated in $p_remove_dir will be removed from the
   * memorized path of each file / directory listed when this path
   * exists. By default nothing is removed (empty path '')
   * The path indicated in $p_add_dir will be added at the beginning of
   * the memorized path of each file / directory listed. However it can
   * be set to empty ''. The adding of a path is done after the removing
   * of path.
   * The path add/remove ability enables the user to prepare an archive
   * for extraction in a different path than the origin files are.
   * See also addModify() method for file adding properties.
   *
   * @param array $p_filelist An array of filenames and directory names,
   *                             or a single string with names separated by
   *                             a single blank space.
   * @param string $p_add_dir A string which contains a path to be added
   *                             to the memorized path of each element in
   *                             the list.
   * @param string $p_remove_dir A string which contains a path to be
   *                             removed from the memorized path of each
   *                             element in the list, when relevant.
   *
   * @return boolean true on success, false on error.
   * @see addModify()
   */
  public function createModify($p_filelist, $p_add_dir, $p_remove_dir = '') {
    $v_result = true;
    if (!$this
      ->_openWrite()) {
      return false;
    }
    if ($p_filelist != '') {
      if (is_array($p_filelist)) {
        $v_list = $p_filelist;
      }
      elseif (is_string($p_filelist)) {
        $v_list = explode($this->_separator, $p_filelist);
      }
      else {
        $this
          ->_cleanFile();
        $this
          ->_error('Invalid file list');
        return false;
      }
      $v_result = $this
        ->_addList($v_list, $p_add_dir, $p_remove_dir);
    }
    if ($v_result) {
      $this
        ->_writeFooter();
      $this
        ->_close();
    }
    else {
      $this
        ->_cleanFile();
    }
    return $v_result;
  }

  /**
   * This method add the files / directories listed in $p_filelist at the
   * end of the existing archive. If the archive does not yet exists it
   * is created.
   * The $p_filelist parameter can be an array of string, each string
   * representing a filename or a directory name with their path if
   * needed. It can also be a single string with names separated by a
   * single blank.
   * The path indicated in $p_remove_dir will be removed from the
   * memorized path of each file / directory listed when this path
   * exists. By default nothing is removed (empty path '')
   * The path indicated in $p_add_dir will be added at the beginning of
   * the memorized path of each file / directory listed. However it can
   * be set to empty ''. The adding of a path is done after the removing
   * of path.
   * The path add/remove ability enables the user to prepare an archive
   * for extraction in a different path than the origin files are.
   * If a file/dir is already in the archive it will only be added at the
   * end of the archive. There is no update of the existing archived
   * file/dir. However while extracting the archive, the last file will
   * replace the first one. This results in a none optimization of the
   * archive size.
   * If a file/dir does not exist the file/dir is ignored. However an
   * error text is send to PEAR error.
   * If a file/dir is not readable the file/dir is ignored. However an
   * error text is send to PEAR error.
   *
   * @param array $p_filelist An array of filenames and directory
   *                             names, or a single string with names
   *                             separated by a single blank space.
   * @param string $p_add_dir A string which contains a path to be
   *                             added to the memorized path of each
   *                             element in the list.
   * @param string $p_remove_dir A string which contains a path to be
   *                             removed from the memorized path of
   *                             each element in the list, when
   *                             relevant.
   *
   * @return true on success, false on error.
   */
  public function addModify($p_filelist, $p_add_dir, $p_remove_dir = '') {
    $v_result = true;
    if (!$this
      ->_isArchive()) {
      $v_result = $this
        ->createModify($p_filelist, $p_add_dir, $p_remove_dir);
    }
    else {
      if (is_array($p_filelist)) {
        $v_list = $p_filelist;
      }
      elseif (is_string($p_filelist)) {
        $v_list = explode($this->_separator, $p_filelist);
      }
      else {
        $this
          ->_error('Invalid file list');
        return false;
      }
      $v_result = $this
        ->_append($v_list, $p_add_dir, $p_remove_dir);
    }
    return $v_result;
  }

  /**
   * This method add a single string as a file at the
   * end of the existing archive. If the archive does not yet exists it
   * is created.
   *
   * @param string $p_filename A string which contains the full
   *                           filename path that will be associated
   *                           with the string.
   * @param string $p_string The content of the file added in
   *                           the archive.
   * @param bool|int $p_datetime A custom date/time (unix timestamp)
   *                           for the file (optional).
   * @param array $p_params An array of optional params:
   *                               stamp => the datetime (replaces
   *                                   datetime above if it exists)
   *                               mode => the permissions on the
   *                                   file (600 by default)
   *                               type => is this a link?  See the
   *                                   tar specification for details.
   *                                   (default = regular file)
   *                               uid => the user ID of the file
   *                                   (default = 0 = root)
   *                               gid => the group ID of the file
   *                                   (default = 0 = root)
   *
   * @return true on success, false on error.
   */
  public function addString($p_filename, $p_string, $p_datetime = false, $p_params = array()) {
    $p_stamp = @$p_params["stamp"] ? $p_params["stamp"] : ($p_datetime ? $p_datetime : time());
    $p_mode = @$p_params["mode"] ? $p_params["mode"] : 0600;
    $p_type = @$p_params["type"] ? $p_params["type"] : "";
    $p_uid = @$p_params["uid"] ? $p_params["uid"] : "";
    $p_gid = @$p_params["gid"] ? $p_params["gid"] : "";
    $v_result = true;
    if (!$this
      ->_isArchive()) {
      if (!$this
        ->_openWrite()) {
        return false;
      }
      $this
        ->_close();
    }
    if (!$this
      ->_openAppend()) {
      return false;
    }

    // Need to check the get back to the temporary file ? ....
    $v_result = $this
      ->_addString($p_filename, $p_string, $p_datetime, $p_params);
    $this
      ->_writeFooter();
    $this
      ->_close();
    return $v_result;
  }

  /**
   * This method extract all the content of the archive in the directory
   * indicated by $p_path. When relevant the memorized path of the
   * files/dir can be modified by removing the $p_remove_path path at the
   * beginning of the file/dir path.
   * While extracting a file, if the directory path does not exists it is
   * created.
   * While extracting a file, if the file already exists it is replaced
   * without looking for last modification date.
   * While extracting a file, if the file already exists and is write
   * protected, the extraction is aborted.
   * While extracting a file, if a directory with the same name already
   * exists, the extraction is aborted.
   * While extracting a directory, if a file with the same name already
   * exists, the extraction is aborted.
   * While extracting a file/directory if the destination directory exist
   * and is write protected, or does not exist but can not be created,
   * the extraction is aborted.
   * If after extraction an extracted file does not show the correct
   * stored file size, the extraction is aborted.
   * When the extraction is aborted, a PEAR error text is set and false
   * is returned. However the result can be a partial extraction that may
   * need to be manually cleaned.
   *
   * @param string $p_path The path of the directory where the
   *                               files/dir need to by extracted.
   * @param string $p_remove_path Part of the memorized path that can be
   *                               removed if present at the beginning of
   *                               the file/dir path.
   * @param boolean $p_preserve Preserve user/group ownership of files
   *
   * @return boolean true on success, false on error.
   * @see    extractList()
   */
  public function extractModify($p_path, $p_remove_path, $p_preserve = false) {
    $v_result = true;
    $v_list_detail = array();
    if ($v_result = $this
      ->_openRead()) {
      $v_result = $this
        ->_extractList($p_path, $v_list_detail, "complete", 0, $p_remove_path, $p_preserve);
      $this
        ->_close();
    }
    return $v_result;
  }

  /**
   * This method extract from the archive one file identified by $p_filename.
   * The return value is a string with the file content, or NULL on error.
   *
   * @param string $p_filename The path of the file to extract in a string.
   *
   * @return a string with the file content or NULL.
   */
  public function extractInString($p_filename) {
    if ($this
      ->_openRead()) {
      $v_result = $this
        ->_extractInString($p_filename);
      $this
        ->_close();
    }
    else {
      $v_result = null;
    }
    return $v_result;
  }

  /**
   * This method extract from the archive only the files indicated in the
   * $p_filelist. These files are extracted in the current directory or
   * in the directory indicated by the optional $p_path parameter.
   * If indicated the $p_remove_path can be used in the same way as it is
   * used in extractModify() method.
   *
   * @param array $p_filelist An array of filenames and directory names,
   *                               or a single string with names separated
   *                               by a single blank space.
   * @param string $p_path The path of the directory where the
   *                               files/dir need to by extracted.
   * @param string $p_remove_path Part of the memorized path that can be
   *                               removed if present at the beginning of
   *                               the file/dir path.
   * @param boolean $p_preserve Preserve user/group ownership of files
   *
   * @return true on success, false on error.
   * @see    extractModify()
   */
  public function extractList($p_filelist, $p_path = '', $p_remove_path = '', $p_preserve = false) {
    $v_result = true;
    $v_list_detail = array();
    if (is_array($p_filelist)) {
      $v_list = $p_filelist;
    }
    elseif (is_string($p_filelist)) {
      $v_list = explode($this->_separator, $p_filelist);
    }
    else {
      $this
        ->_error('Invalid string list');
      return false;
    }
    if ($v_result = $this
      ->_openRead()) {
      $v_result = $this
        ->_extractList($p_path, $v_list_detail, "partial", $v_list, $p_remove_path, $p_preserve);
      $this
        ->_close();
    }
    return $v_result;
  }

  /**
   * This method set specific attributes of the archive. It uses a variable
   * list of parameters, in the format attribute code + attribute values :
   * $arch->setAttribute(ARCHIVE_TAR_ATT_SEPARATOR, ',');
   *
   * @return true on success, false on error.
   */
  public function setAttribute() {
    $v_result = true;

    // ----- Get the number of variable list of arguments
    if (($v_size = func_num_args()) == 0) {
      return true;
    }

    // ----- Get the arguments
    $v_att_list =& func_get_args();

    // ----- Read the attributes
    $i = 0;
    while ($i < $v_size) {

      // ----- Look for next option
      switch ($v_att_list[$i]) {

        // ----- Look for options that request a string value
        case ARCHIVE_TAR_ATT_SEPARATOR:

          // ----- Check the number of parameters
          if ($i + 1 >= $v_size) {
            $this
              ->_error('Invalid number of parameters for ' . 'attribute ARCHIVE_TAR_ATT_SEPARATOR');
            return false;
          }

          // ----- Get the value
          $this->_separator = $v_att_list[$i + 1];
          $i++;
          break;
        default:
          $this
            ->_error('Unknown attribute code ' . $v_att_list[$i] . '');
          return false;
      }

      // ----- Next attribute
      $i++;
    }
    return $v_result;
  }

  /**
   * This method sets the regular expression for ignoring files and directories
   * at import, for example:
   * $arch->setIgnoreRegexp("#CVS|\.svn#");
   *
   * @param string $regexp regular expression defining which files or directories to ignore
   */
  public function setIgnoreRegexp($regexp) {
    $this->_ignore_regexp = $regexp;
  }

  /**
   * This method sets the regular expression for ignoring all files and directories
   * matching the filenames in the array list at import, for example:
   * $arch->setIgnoreList(array('CVS', '.svn', 'bin/tool'));
   *
   * @param array $list a list of file or directory names to ignore
   *
   * @access public
   */
  public function setIgnoreList($list) {
    $regexp = str_replace(array(
      '#',
      '.',
      '^',
      '$',
    ), array(
      '\\#',
      '\\.',
      '\\^',
      '\\$',
    ), $list);
    $regexp = '#/' . join('$|/', $list) . '#';
    $this
      ->setIgnoreRegexp($regexp);
  }

  /**
   * @param string $p_message
   */
  public function _error($p_message) {

    // Drupal change $this->error_object = $this->raiseError($p_message).
    throw new Exception($p_message);
  }

  /**
   * @param string $p_message
   */
  public function _warning($p_message) {

    // Drupal change $this->error_object = $this->raiseError($p_message).
    throw new Exception($p_message);
  }

  /**
   * @param string $p_filename
   * @return bool
   */
  public function _isArchive($p_filename = null) {
    if ($p_filename == null) {
      $p_filename = $this->_tarname;
    }
    clearstatcache();
    return @is_file($p_filename) && !@is_link($p_filename);
  }

  /**
   * @return bool
   */
  public function _openWrite() {
    if ($this->_compress_type == 'gz' && function_exists('gzopen')) {
      $this->_file = @gzopen($this->_tarname, "wb9");
    }
    else {
      if ($this->_compress_type == 'bz2' && function_exists('bzopen')) {
        $this->_file = @bzopen($this->_tarname, "w");
      }
      else {
        if ($this->_compress_type == 'lzma2' && function_exists('xzopen')) {
          $this->_file = @xzopen($this->_tarname, 'w');
        }
        else {
          if ($this->_compress_type == 'none') {
            $this->_file = @fopen($this->_tarname, "wb");
          }
          else {
            $this
              ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            return false;
          }
        }
      }
    }
    if ($this->_file == 0) {
      $this
        ->_error('Unable to open in write mode \'' . $this->_tarname . '\'');
      return false;
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _openRead() {
    if (strtolower(substr($this->_tarname, 0, 7)) == 'http://') {

      // ----- Look if a local copy need to be done
      if ($this->_temp_tarname == '') {
        $this->_temp_tarname = uniqid('tar') . '.tmp';
        if (!($v_file_from = @fopen($this->_tarname, 'rb'))) {
          $this
            ->_error('Unable to open in read mode \'' . $this->_tarname . '\'');
          $this->_temp_tarname = '';
          return false;
        }
        if (!($v_file_to = @fopen($this->_temp_tarname, 'wb'))) {
          $this
            ->_error('Unable to open in write mode \'' . $this->_temp_tarname . '\'');
          $this->_temp_tarname = '';
          return false;
        }
        while ($v_data = @fread($v_file_from, 1024)) {
          @fwrite($v_file_to, $v_data);
        }
        @fclose($v_file_from);
        @fclose($v_file_to);
      }

      // ----- File to open if the local copy
      $v_filename = $this->_temp_tarname;
    }
    else {

      // ----- File to open if the normal Tar file
      $v_filename = $this->_tarname;
    }
    if ($this->_compress_type == 'gz' && function_exists('gzopen')) {
      $this->_file = @gzopen($v_filename, "rb");
    }
    else {
      if ($this->_compress_type == 'bz2' && function_exists('bzopen')) {
        $this->_file = @bzopen($v_filename, "r");
      }
      else {
        if ($this->_compress_type == 'lzma2' && function_exists('xzopen')) {
          $this->_file = @xzopen($v_filename, "r");
        }
        else {
          if ($this->_compress_type == 'none') {
            $this->_file = @fopen($v_filename, "rb");
          }
          else {
            $this
              ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            return false;
          }
        }
      }
    }
    if ($this->_file == 0) {
      $this
        ->_error('Unable to open in read mode \'' . $v_filename . '\'');
      return false;
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _openReadWrite() {
    if ($this->_compress_type == 'gz') {
      $this->_file = @gzopen($this->_tarname, "r+b");
    }
    else {
      if ($this->_compress_type == 'bz2') {
        $this
          ->_error('Unable to open bz2 in read/write mode \'' . $this->_tarname . '\' (limitation of bz2 extension)');
        return false;
      }
      else {
        if ($this->_compress_type == 'lzma2') {
          $this
            ->_error('Unable to open lzma2 in read/write mode \'' . $this->_tarname . '\' (limitation of lzma2 extension)');
          return false;
        }
        else {
          if ($this->_compress_type == 'none') {
            $this->_file = @fopen($this->_tarname, "r+b");
          }
          else {
            $this
              ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            return false;
          }
        }
      }
    }
    if ($this->_file == 0) {
      $this
        ->_error('Unable to open in read/write mode \'' . $this->_tarname . '\'');
      return false;
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _close() {

    //if (isset($this->_file)) {
    if (is_resource($this->_file)) {
      if ($this->_compress_type == 'gz') {
        @gzclose($this->_file);
      }
      else {
        if ($this->_compress_type == 'bz2') {
          @bzclose($this->_file);
        }
        else {
          if ($this->_compress_type == 'lzma2') {
            @xzclose($this->_file);
          }
          else {
            if ($this->_compress_type == 'none') {
              @fclose($this->_file);
            }
            else {
              $this
                ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            }
          }
        }
      }
      $this->_file = 0;
    }

    // ----- Look if a local copy need to be erase
    // Note that it might be interesting to keep the url for a time : ToDo
    if ($this->_temp_tarname != '') {
      @drupal_unlink($this->_temp_tarname);
      $this->_temp_tarname = '';
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _cleanFile() {
    $this
      ->_close();

    // ----- Look for a local copy
    if ($this->_temp_tarname != '') {

      // ----- Remove the local copy but not the remote tarname
      @drupal_unlink($this->_temp_tarname);
      $this->_temp_tarname = '';
    }
    else {

      // ----- Remove the local tarname file
      @drupal_unlink($this->_tarname);
    }
    $this->_tarname = '';
    return true;
  }

  /**
   * @param mixed $p_binary_data
   * @param integer $p_len
   * @return bool
   */
  public function _writeBlock($p_binary_data, $p_len = null) {
    if (is_resource($this->_file)) {
      if ($p_len === null) {
        if ($this->_compress_type == 'gz') {
          @gzputs($this->_file, $p_binary_data);
        }
        else {
          if ($this->_compress_type == 'bz2') {
            @bzwrite($this->_file, $p_binary_data);
          }
          else {
            if ($this->_compress_type == 'lzma2') {
              @xzwrite($this->_file, $p_binary_data);
            }
            else {
              if ($this->_compress_type == 'none') {
                @fputs($this->_file, $p_binary_data);
              }
              else {
                $this
                  ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
              }
            }
          }
        }
      }
      else {
        if ($this->_compress_type == 'gz') {
          @gzputs($this->_file, $p_binary_data, $p_len);
        }
        else {
          if ($this->_compress_type == 'bz2') {
            @bzwrite($this->_file, $p_binary_data, $p_len);
          }
          else {
            if ($this->_compress_type == 'lzma2') {
              @xzwrite($this->_file, $p_binary_data, $p_len);
            }
            else {
              if ($this->_compress_type == 'none') {
                @fputs($this->_file, $p_binary_data, $p_len);
              }
              else {
                $this
                  ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
              }
            }
          }
        }
      }
    }
    return true;
  }

  /**
   * @return null|string
   */
  public function _readBlock() {
    $v_block = null;
    if (is_resource($this->_file)) {
      if ($this->_compress_type == 'gz') {
        $v_block = @gzread($this->_file, 512);
      }
      else {
        if ($this->_compress_type == 'bz2') {
          $v_block = @bzread($this->_file, 512);
        }
        else {
          if ($this->_compress_type == 'lzma2') {
            $v_block = @xzread($this->_file, 512);
          }
          else {
            if ($this->_compress_type == 'none') {
              $v_block = @fread($this->_file, 512);
            }
            else {
              $this
                ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            }
          }
        }
      }
    }
    return $v_block;
  }

  /**
   * @param null $p_len
   * @return bool
   */
  public function _jumpBlock($p_len = null) {
    if (is_resource($this->_file)) {
      if ($p_len === null) {
        $p_len = 1;
      }
      if ($this->_compress_type == 'gz') {
        @gzseek($this->_file, gztell($this->_file) + $p_len * 512);
      }
      else {
        if ($this->_compress_type == 'bz2') {

          // ----- Replace missing bztell() and bzseek()
          for ($i = 0; $i < $p_len; $i++) {
            $this
              ->_readBlock();
          }
        }
        else {
          if ($this->_compress_type == 'lzma2') {

            // ----- Replace missing xztell() and xzseek()
            for ($i = 0; $i < $p_len; $i++) {
              $this
                ->_readBlock();
            }
          }
          else {
            if ($this->_compress_type == 'none') {
              @fseek($this->_file, $p_len * 512, SEEK_CUR);
            }
            else {
              $this
                ->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
            }
          }
        }
      }
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _writeFooter() {
    if (is_resource($this->_file)) {

      // ----- Write the last 0 filled block for end of archive
      $v_binary_data = pack('a1024', '');
      $this
        ->_writeBlock($v_binary_data);
    }
    return true;
  }

  /**
   * @param array $p_list
   * @param string $p_add_dir
   * @param string $p_remove_dir
   * @return bool
   */
  public function _addList($p_list, $p_add_dir, $p_remove_dir) {
    $v_result = true;
    $v_header = array();

    // ----- Remove potential windows directory separator
    $p_add_dir = $this
      ->_translateWinPath($p_add_dir);
    $p_remove_dir = $this
      ->_translateWinPath($p_remove_dir, false);
    if (!$this->_file) {
      $this
        ->_error('Invalid file descriptor');
      return false;
    }
    if (sizeof($p_list) == 0) {
      return true;
    }
    foreach ($p_list as $v_filename) {
      if (!$v_result) {
        break;
      }

      // ----- Skip the current tar name
      if ($v_filename == $this->_tarname) {
        continue;
      }
      if ($v_filename == '') {
        continue;
      }

      // ----- ignore files and directories matching the ignore regular expression
      if ($this->_ignore_regexp && preg_match($this->_ignore_regexp, '/' . $v_filename)) {
        $this
          ->_warning("File '{$v_filename}' ignored");
        continue;
      }
      if (!file_exists($v_filename) && !is_link($v_filename)) {
        $this
          ->_warning("File '{$v_filename}' does not exist");
        continue;
      }

      // ----- Add the file or directory header
      if (!$this
        ->_addFile($v_filename, $v_header, $p_add_dir, $p_remove_dir)) {
        return false;
      }
      if (@is_dir($v_filename) && !@is_link($v_filename)) {
        if (!($p_hdir = opendir($v_filename))) {
          $this
            ->_warning("Directory '{$v_filename}' can not be read");
          continue;
        }
        while (false !== ($p_hitem = readdir($p_hdir))) {
          if ($p_hitem != '.' && $p_hitem != '..') {
            if ($v_filename != ".") {
              $p_temp_list[0] = $v_filename . '/' . $p_hitem;
            }
            else {
              $p_temp_list[0] = $p_hitem;
            }
            $v_result = $this
              ->_addList($p_temp_list, $p_add_dir, $p_remove_dir);
          }
        }
        unset($p_temp_list);
        unset($p_hdir);
        unset($p_hitem);
      }
    }
    return $v_result;
  }

  /**
   * @param string $p_filename
   * @param mixed $p_header
   * @param string $p_add_dir
   * @param string $p_remove_dir
   * @param null $v_stored_filename
   * @return bool
   */
  public function _addFile($p_filename, &$p_header, $p_add_dir, $p_remove_dir, $v_stored_filename = null) {
    if (!$this->_file) {
      $this
        ->_error('Invalid file descriptor');
      return false;
    }
    if ($p_filename == '') {
      $this
        ->_error('Invalid file name');
      return false;
    }
    if (is_null($v_stored_filename)) {

      // ----- Calculate the stored filename
      $p_filename = $this
        ->_translateWinPath($p_filename, false);
      $v_stored_filename = $p_filename;
      if (strcmp($p_filename, $p_remove_dir) == 0) {
        return true;
      }
      if ($p_remove_dir != '') {
        if (substr($p_remove_dir, -1) != '/') {
          $p_remove_dir .= '/';
        }
        if (substr($p_filename, 0, strlen($p_remove_dir)) == $p_remove_dir) {
          $v_stored_filename = substr($p_filename, strlen($p_remove_dir));
        }
      }
      $v_stored_filename = $this
        ->_translateWinPath($v_stored_filename);
      if ($p_add_dir != '') {
        if (substr($p_add_dir, -1) == '/') {
          $v_stored_filename = $p_add_dir . $v_stored_filename;
        }
        else {
          $v_stored_filename = $p_add_dir . '/' . $v_stored_filename;
        }
      }
      $v_stored_filename = $this
        ->_pathReduction($v_stored_filename);
    }
    if ($this
      ->_isArchive($p_filename)) {
      if (($v_file = @fopen($p_filename, "rb")) == 0) {
        $this
          ->_warning("Unable to open file '" . $p_filename . "' in binary read mode");
        return true;
      }
      if (!$this
        ->_writeHeader($p_filename, $v_stored_filename)) {
        return false;
      }
      while (($v_buffer = fread($v_file, 512)) != '') {
        $v_binary_data = pack("a512", "{$v_buffer}");
        $this
          ->_writeBlock($v_binary_data);
      }
      fclose($v_file);
    }
    else {

      // ----- Only header for dir
      if (!$this
        ->_writeHeader($p_filename, $v_stored_filename)) {
        return false;
      }
    }
    return true;
  }

  /**
   * @param string $p_filename
   * @param string $p_string
   * @param bool $p_datetime
   * @param array $p_params
   * @return bool
   */
  public function _addString($p_filename, $p_string, $p_datetime = false, $p_params = array()) {
    $p_stamp = @$p_params["stamp"] ? $p_params["stamp"] : ($p_datetime ? $p_datetime : time());
    $p_mode = @$p_params["mode"] ? $p_params["mode"] : 0600;
    $p_type = @$p_params["type"] ? $p_params["type"] : "";
    $p_uid = @$p_params["uid"] ? $p_params["uid"] : 0;
    $p_gid = @$p_params["gid"] ? $p_params["gid"] : 0;
    if (!$this->_file) {
      $this
        ->_error('Invalid file descriptor');
      return false;
    }
    if ($p_filename == '') {
      $this
        ->_error('Invalid file name');
      return false;
    }

    // ----- Calculate the stored filename
    $p_filename = $this
      ->_translateWinPath($p_filename, false);

    // ----- If datetime is not specified, set current time
    if ($p_datetime === false) {
      $p_datetime = time();
    }
    if (!$this
      ->_writeHeaderBlock($p_filename, strlen($p_string), $p_stamp, $p_mode, $p_type, $p_uid, $p_gid)) {
      return false;
    }
    $i = 0;
    while (($v_buffer = substr($p_string, $i++ * 512, 512)) != '') {
      $v_binary_data = pack("a512", $v_buffer);
      $this
        ->_writeBlock($v_binary_data);
    }
    return true;
  }

  /**
   * @param string $p_filename
   * @param string $p_stored_filename
   * @return bool
   */
  public function _writeHeader($p_filename, $p_stored_filename) {
    if ($p_stored_filename == '') {
      $p_stored_filename = $p_filename;
    }
    $v_reduce_filename = $this
      ->_pathReduction($p_stored_filename);
    if (strlen($v_reduce_filename) > 99) {
      if (!$this
        ->_writeLongHeader($v_reduce_filename)) {
        return false;
      }
    }
    $v_info = lstat($p_filename);
    $v_uid = sprintf("%07s", DecOct($v_info[4]));
    $v_gid = sprintf("%07s", DecOct($v_info[5]));
    $v_perms = sprintf("%07s", DecOct($v_info['mode'] & 0777));
    $v_mtime = sprintf("%011s", DecOct($v_info['mtime']));
    $v_linkname = '';
    if (@is_link($p_filename)) {
      $v_typeflag = '2';
      $v_linkname = readlink($p_filename);
      $v_size = sprintf("%011s", DecOct(0));
    }
    elseif (@is_dir($p_filename)) {
      $v_typeflag = "5";
      $v_size = sprintf("%011s", DecOct(0));
    }
    else {
      $v_typeflag = '0';
      clearstatcache();
      $v_size = sprintf("%011s", DecOct($v_info['size']));
    }
    $v_magic = 'ustar ';
    $v_version = ' ';
    if (function_exists('posix_getpwuid')) {
      $userinfo = posix_getpwuid($v_info[4]);
      $groupinfo = posix_getgrgid($v_info[5]);
      $v_uname = $userinfo['name'];
      $v_gname = $groupinfo['name'];
    }
    else {
      $v_uname = '';
      $v_gname = '';
    }
    $v_devmajor = '';
    $v_devminor = '';
    $v_prefix = '';
    $v_binary_data_first = pack("a100a8a8a8a12a12", $v_reduce_filename, $v_perms, $v_uid, $v_gid, $v_size, $v_mtime);
    $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $v_typeflag, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');

    // ----- Calculate the checksum
    $v_checksum = 0;

    // ..... First part of the header
    for ($i = 0; $i < 148; $i++) {
      $v_checksum += ord(substr($v_binary_data_first, $i, 1));
    }

    // ..... Ignore the checksum value and replace it by ' ' (space)
    for ($i = 148; $i < 156; $i++) {
      $v_checksum += ord(' ');
    }

    // ..... Last part of the header
    for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
      $v_checksum += ord(substr($v_binary_data_last, $j, 1));
    }

    // ----- Write the first 148 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_first, 148);

    // ----- Write the calculated checksum
    $v_checksum = sprintf("%06s ", DecOct($v_checksum));
    $v_binary_data = pack("a8", $v_checksum);
    $this
      ->_writeBlock($v_binary_data, 8);

    // ----- Write the last 356 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_last, 356);
    return true;
  }

  /**
   * @param string $p_filename
   * @param int $p_size
   * @param int $p_mtime
   * @param int $p_perms
   * @param string $p_type
   * @param int $p_uid
   * @param int $p_gid
   * @return bool
   */
  public function _writeHeaderBlock($p_filename, $p_size, $p_mtime = 0, $p_perms = 0, $p_type = '', $p_uid = 0, $p_gid = 0) {
    $p_filename = $this
      ->_pathReduction($p_filename);
    if (strlen($p_filename) > 99) {
      if (!$this
        ->_writeLongHeader($p_filename)) {
        return false;
      }
    }
    if ($p_type == "5") {
      $v_size = sprintf("%011s", DecOct(0));
    }
    else {
      $v_size = sprintf("%011s", DecOct($p_size));
    }
    $v_uid = sprintf("%07s", DecOct($p_uid));
    $v_gid = sprintf("%07s", DecOct($p_gid));
    $v_perms = sprintf("%07s", DecOct($p_perms & 0777));
    $v_mtime = sprintf("%11s", DecOct($p_mtime));
    $v_linkname = '';
    $v_magic = 'ustar ';
    $v_version = ' ';
    if (function_exists('posix_getpwuid')) {
      $userinfo = posix_getpwuid($p_uid);
      $groupinfo = posix_getgrgid($p_gid);
      $v_uname = $userinfo['name'];
      $v_gname = $groupinfo['name'];
    }
    else {
      $v_uname = '';
      $v_gname = '';
    }
    $v_devmajor = '';
    $v_devminor = '';
    $v_prefix = '';
    $v_binary_data_first = pack("a100a8a8a8a12A12", $p_filename, $v_perms, $v_uid, $v_gid, $v_size, $v_mtime);
    $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $p_type, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');

    // ----- Calculate the checksum
    $v_checksum = 0;

    // ..... First part of the header
    for ($i = 0; $i < 148; $i++) {
      $v_checksum += ord(substr($v_binary_data_first, $i, 1));
    }

    // ..... Ignore the checksum value and replace it by ' ' (space)
    for ($i = 148; $i < 156; $i++) {
      $v_checksum += ord(' ');
    }

    // ..... Last part of the header
    for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
      $v_checksum += ord(substr($v_binary_data_last, $j, 1));
    }

    // ----- Write the first 148 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_first, 148);

    // ----- Write the calculated checksum
    $v_checksum = sprintf("%06s ", DecOct($v_checksum));
    $v_binary_data = pack("a8", $v_checksum);
    $this
      ->_writeBlock($v_binary_data, 8);

    // ----- Write the last 356 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_last, 356);
    return true;
  }

  /**
   * @param string $p_filename
   * @return bool
   */
  public function _writeLongHeader($p_filename) {
    $v_size = sprintf("%11s ", DecOct(strlen($p_filename)));
    $v_typeflag = 'L';
    $v_linkname = '';
    $v_magic = '';
    $v_version = '';
    $v_uname = '';
    $v_gname = '';
    $v_devmajor = '';
    $v_devminor = '';
    $v_prefix = '';
    $v_binary_data_first = pack("a100a8a8a8a12a12", '././@LongLink', 0, 0, 0, $v_size, 0);
    $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", $v_typeflag, $v_linkname, $v_magic, $v_version, $v_uname, $v_gname, $v_devmajor, $v_devminor, $v_prefix, '');

    // ----- Calculate the checksum
    $v_checksum = 0;

    // ..... First part of the header
    for ($i = 0; $i < 148; $i++) {
      $v_checksum += ord(substr($v_binary_data_first, $i, 1));
    }

    // ..... Ignore the checksum value and replace it by ' ' (space)
    for ($i = 148; $i < 156; $i++) {
      $v_checksum += ord(' ');
    }

    // ..... Last part of the header
    for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
      $v_checksum += ord(substr($v_binary_data_last, $j, 1));
    }

    // ----- Write the first 148 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_first, 148);

    // ----- Write the calculated checksum
    $v_checksum = sprintf("%06s ", DecOct($v_checksum));
    $v_binary_data = pack("a8", $v_checksum);
    $this
      ->_writeBlock($v_binary_data, 8);

    // ----- Write the last 356 bytes of the header in the archive
    $this
      ->_writeBlock($v_binary_data_last, 356);

    // ----- Write the filename as content of the block
    $i = 0;
    while (($v_buffer = substr($p_filename, $i++ * 512, 512)) != '') {
      $v_binary_data = pack("a512", "{$v_buffer}");
      $this
        ->_writeBlock($v_binary_data);
    }
    return true;
  }

  /**
   * @param mixed $v_binary_data
   * @param mixed $v_header
   * @return bool
   */
  public function _readHeader($v_binary_data, &$v_header) {
    if (strlen($v_binary_data) == 0) {
      $v_header['filename'] = '';
      return true;
    }
    if (strlen($v_binary_data) != 512) {
      $v_header['filename'] = '';
      $this
        ->_error('Invalid block size : ' . strlen($v_binary_data));
      return false;
    }
    if (!is_array($v_header)) {
      $v_header = array();
    }

    // ----- Calculate the checksum
    $v_checksum = 0;

    // ..... First part of the header
    for ($i = 0; $i < 148; $i++) {
      $v_checksum += ord(substr($v_binary_data, $i, 1));
    }

    // ..... Ignore the checksum value and replace it by ' ' (space)
    for ($i = 148; $i < 156; $i++) {
      $v_checksum += ord(' ');
    }

    // ..... Last part of the header
    for ($i = 156; $i < 512; $i++) {
      $v_checksum += ord(substr($v_binary_data, $i, 1));
    }
    if (version_compare(PHP_VERSION, "5.5.0-dev") < 0) {
      $fmt = "a100filename/a8mode/a8uid/a8gid/a12size/a12mtime/" . "a8checksum/a1typeflag/a100link/a6magic/a2version/" . "a32uname/a32gname/a8devmajor/a8devminor/a131prefix";
    }
    else {
      $fmt = "Z100filename/Z8mode/Z8uid/Z8gid/Z12size/Z12mtime/" . "Z8checksum/Z1typeflag/Z100link/Z6magic/Z2version/" . "Z32uname/Z32gname/Z8devmajor/Z8devminor/Z131prefix";
    }
    $v_data = unpack($fmt, $v_binary_data);
    if (strlen($v_data["prefix"]) > 0) {
      $v_data["filename"] = "{$v_data['prefix']}/{$v_data['filename']}";
    }

    // ----- Extract the checksum
    $v_header['checksum'] = OctDec(trim($v_data['checksum']));
    if ($v_header['checksum'] != $v_checksum) {
      $v_header['filename'] = '';

      // ----- Look for last block (empty block)
      if ($v_checksum == 256 && $v_header['checksum'] == 0) {
        return true;
      }
      $this
        ->_error('Invalid checksum for file "' . $v_data['filename'] . '" : ' . $v_checksum . ' calculated, ' . $v_header['checksum'] . ' expected');
      return false;
    }

    // ----- Extract the properties
    $v_header['filename'] = rtrim($v_data['filename'], "\0");
    if ($this
      ->_maliciousFilename($v_header['filename'])) {
      $this
        ->_error('Malicious .tar detected, file "' . $v_header['filename'] . '" will not install in desired directory tree');
      return false;
    }
    $v_header['mode'] = OctDec(trim($v_data['mode']));
    $v_header['uid'] = OctDec(trim($v_data['uid']));
    $v_header['gid'] = OctDec(trim($v_data['gid']));
    $v_header['size'] = OctDec(trim($v_data['size']));
    $v_header['mtime'] = OctDec(trim($v_data['mtime']));
    if (($v_header['typeflag'] = $v_data['typeflag']) == "5") {
      $v_header['size'] = 0;
    }
    $v_header['link'] = trim($v_data['link']);

    /* ----- All these fields are removed form the header because
       they do not carry interesting info
       $v_header[magic] = trim($v_data[magic]);
       $v_header[version] = trim($v_data[version]);
       $v_header[uname] = trim($v_data[uname]);
       $v_header[gname] = trim($v_data[gname]);
       $v_header[devmajor] = trim($v_data[devmajor]);
       $v_header[devminor] = trim($v_data[devminor]);
       */
    return true;
  }

  /**
   * Detect and report a malicious file name
   *
   * @param string $file
   *
   * @return bool
   */
  private function _maliciousFilename($file) {
    if (strpos($file, '/../') !== false) {
      return true;
    }
    if (strpos($file, '../') === 0) {
      return true;
    }
    return false;
  }

  /**
   * @param $v_header
   * @return bool
   */
  public function _readLongHeader(&$v_header) {
    $v_filename = '';
    $v_filesize = $v_header['size'];
    $n = floor($v_header['size'] / 512);
    for ($i = 0; $i < $n; $i++) {
      $v_content = $this
        ->_readBlock();
      $v_filename .= $v_content;
    }
    if ($v_header['size'] % 512 != 0) {
      $v_content = $this
        ->_readBlock();
      $v_filename .= $v_content;
    }

    // ----- Read the next header
    $v_binary_data = $this
      ->_readBlock();
    if (!$this
      ->_readHeader($v_binary_data, $v_header)) {
      return false;
    }
    $v_filename = rtrim(substr($v_filename, 0, $v_filesize), "\0");
    $v_header['filename'] = $v_filename;
    if ($this
      ->_maliciousFilename($v_filename)) {
      $this
        ->_error('Malicious .tar detected, file "' . $v_filename . '" will not install in desired directory tree');
      return false;
    }
    return true;
  }

  /**
   * This method extract from the archive one file identified by $p_filename.
   * The return value is a string with the file content, or null on error.
   *
   * @param string $p_filename The path of the file to extract in a string.
   *
   * @return a string with the file content or null.
   */
  private function _extractInString($p_filename) {
    $v_result_str = "";
    while (strlen($v_binary_data = $this
      ->_readBlock()) != 0) {
      if (!$this
        ->_readHeader($v_binary_data, $v_header)) {
        return null;
      }
      if ($v_header['filename'] == '') {
        continue;
      }

      // ----- Look for long filename
      if ($v_header['typeflag'] == 'L') {
        if (!$this
          ->_readLongHeader($v_header)) {
          return null;
        }
      }
      if ($v_header['filename'] == $p_filename) {
        if ($v_header['typeflag'] == "5") {
          $this
            ->_error('Unable to extract in string a directory ' . 'entry {' . $v_header['filename'] . '}');
          return null;
        }
        else {
          $n = floor($v_header['size'] / 512);
          for ($i = 0; $i < $n; $i++) {
            $v_result_str .= $this
              ->_readBlock();
          }
          if ($v_header['size'] % 512 != 0) {
            $v_content = $this
              ->_readBlock();
            $v_result_str .= substr($v_content, 0, $v_header['size'] % 512);
          }
          return $v_result_str;
        }
      }
      else {
        $this
          ->_jumpBlock(ceil($v_header['size'] / 512));
      }
    }
    return null;
  }

  /**
   * @param string $p_path
   * @param string $p_list_detail
   * @param string $p_mode
   * @param string $p_file_list
   * @param string $p_remove_path
   * @param bool $p_preserve
   * @return bool
   */
  public function _extractList($p_path, &$p_list_detail, $p_mode, $p_file_list, $p_remove_path, $p_preserve = false) {
    $v_result = true;
    $v_nb = 0;
    $v_extract_all = true;
    $v_listing = false;
    $p_path = $this
      ->_translateWinPath($p_path, false);
    if ($p_path == '' || substr($p_path, 0, 1) != '/' && substr($p_path, 0, 3) != "../" && !strpos($p_path, ':')) {
      $p_path = "./" . $p_path;
    }
    $p_remove_path = $this
      ->_translateWinPath($p_remove_path);

    // ----- Look for path to remove format (should end by /)
    if ($p_remove_path != '' && substr($p_remove_path, -1) != '/') {
      $p_remove_path .= '/';
    }
    $p_remove_path_size = strlen($p_remove_path);
    switch ($p_mode) {
      case "complete":
        $v_extract_all = true;
        $v_listing = false;
        break;
      case "partial":
        $v_extract_all = false;
        $v_listing = false;
        break;
      case "list":
        $v_extract_all = false;
        $v_listing = true;
        break;
      default:
        $this
          ->_error('Invalid extract mode (' . $p_mode . ')');
        return false;
    }
    clearstatcache();
    while (strlen($v_binary_data = $this
      ->_readBlock()) != 0) {
      $v_extract_file = false;
      $v_extraction_stopped = 0;
      if (!$this
        ->_readHeader($v_binary_data, $v_header)) {
        return false;
      }
      if ($v_header['filename'] == '') {
        continue;
      }

      // ----- Look for long filename
      if ($v_header['typeflag'] == 'L') {
        if (!$this
          ->_readLongHeader($v_header)) {
          return false;
        }
      }

      // ignore extended / pax headers
      if ($v_header['typeflag'] == 'x' || $v_header['typeflag'] == 'g') {
        $this
          ->_jumpBlock(ceil($v_header['size'] / 512));
        continue;
      }
      if (!$v_extract_all && is_array($p_file_list)) {

        // ----- By default no unzip if the file is not found
        $v_extract_file = false;
        for ($i = 0; $i < sizeof($p_file_list); $i++) {

          // ----- Look if it is a directory
          if (substr($p_file_list[$i], -1) == '/') {

            // ----- Look if the directory is in the filename path
            if (strlen($v_header['filename']) > strlen($p_file_list[$i]) && substr($v_header['filename'], 0, strlen($p_file_list[$i])) == $p_file_list[$i]) {
              $v_extract_file = true;
              break;
            }
          }
          elseif ($p_file_list[$i] == $v_header['filename']) {
            $v_extract_file = true;
            break;
          }
        }
      }
      else {
        $v_extract_file = true;
      }

      // ----- Look if this file need to be extracted
      if ($v_extract_file && !$v_listing) {
        if ($p_remove_path != '' && substr($v_header['filename'] . '/', 0, $p_remove_path_size) == $p_remove_path) {
          $v_header['filename'] = substr($v_header['filename'], $p_remove_path_size);
          if ($v_header['filename'] == '') {
            continue;
          }
        }
        if ($p_path != './' && $p_path != '/') {
          while (substr($p_path, -1) == '/') {
            $p_path = substr($p_path, 0, strlen($p_path) - 1);
          }
          if (substr($v_header['filename'], 0, 1) == '/') {
            $v_header['filename'] = $p_path . $v_header['filename'];
          }
          else {
            $v_header['filename'] = $p_path . '/' . $v_header['filename'];
          }
        }
        if (file_exists($v_header['filename'])) {
          if (@is_dir($v_header['filename']) && $v_header['typeflag'] == '') {
            $this
              ->_error('File ' . $v_header['filename'] . ' already exists as a directory');
            return false;
          }
          if ($this
            ->_isArchive($v_header['filename']) && $v_header['typeflag'] == "5") {
            $this
              ->_error('Directory ' . $v_header['filename'] . ' already exists as a file');
            return false;
          }
          if (!is_writeable($v_header['filename'])) {
            $this
              ->_error('File ' . $v_header['filename'] . ' already exists and is write protected');
            return false;
          }
          if (filemtime($v_header['filename']) > $v_header['mtime']) {

            // To be completed : An error or silent no replace ?
          }
        }
        elseif (($v_result = $this
          ->_dirCheck($v_header['typeflag'] == "5" ? $v_header['filename'] : dirname($v_header['filename']))) != 1) {
          $this
            ->_error('Unable to create path for ' . $v_header['filename']);
          return false;
        }
        if ($v_extract_file) {
          if ($v_header['typeflag'] == "5") {
            if (!@file_exists($v_header['filename'])) {
              if (!@mkdir($v_header['filename'], 0777)) {
                $this
                  ->_error('Unable to create directory {' . $v_header['filename'] . '}');
                return false;
              }
            }
          }
          elseif ($v_header['typeflag'] == "2") {
            if (@file_exists($v_header['filename'])) {
              @drupal_unlink($v_header['filename']);
            }
            if (!@symlink($v_header['link'], $v_header['filename'])) {
              $this
                ->_error('Unable to extract symbolic link {' . $v_header['filename'] . '}');
              return false;
            }
          }
          else {
            if (($v_dest_file = @fopen($v_header['filename'], "wb")) == 0) {
              $this
                ->_error('Error while opening {' . $v_header['filename'] . '} in write binary mode');
              return false;
            }
            else {
              $n = floor($v_header['size'] / 512);
              for ($i = 0; $i < $n; $i++) {
                $v_content = $this
                  ->_readBlock();
                fwrite($v_dest_file, $v_content, 512);
              }
              if ($v_header['size'] % 512 != 0) {
                $v_content = $this
                  ->_readBlock();
                fwrite($v_dest_file, $v_content, $v_header['size'] % 512);
              }
              @fclose($v_dest_file);
              if ($p_preserve) {
                @chown($v_header['filename'], $v_header['uid']);
                @chgrp($v_header['filename'], $v_header['gid']);
              }

              // ----- Change the file mode, mtime
              @touch($v_header['filename'], $v_header['mtime']);
              if ($v_header['mode'] & 0111) {

                // make file executable, obey umask
                $mode = fileperms($v_header['filename']) | ~umask() & 0111;
                @chmod($v_header['filename'], $mode);
              }
            }

            // ----- Check the file size
            clearstatcache();
            if (!is_file($v_header['filename'])) {
              $this
                ->_error('Extracted file ' . $v_header['filename'] . 'does not exist. Archive may be corrupted.');
              return false;
            }
            $filesize = filesize($v_header['filename']);
            if ($filesize != $v_header['size']) {
              $this
                ->_error('Extracted file ' . $v_header['filename'] . ' does not have the correct file size \'' . $filesize . '\' (' . $v_header['size'] . ' expected). Archive may be corrupted.');
              return false;
            }
          }
        }
        else {
          $this
            ->_jumpBlock(ceil($v_header['size'] / 512));
        }
      }
      else {
        $this
          ->_jumpBlock(ceil($v_header['size'] / 512));
      }

      /* TBC : Seems to be unused ...
         if ($this->_compress)
           $v_end_of_file = @gzeof($this->_file);
         else
           $v_end_of_file = @feof($this->_file);
           */
      if ($v_listing || $v_extract_file || $v_extraction_stopped) {

        // ----- Log extracted files
        if (($v_file_dir = dirname($v_header['filename'])) == $v_header['filename']) {
          $v_file_dir = '';
        }
        if (substr($v_header['filename'], 0, 1) == '/' && $v_file_dir == '') {
          $v_file_dir = '/';
        }
        $p_list_detail[$v_nb++] = $v_header;
        if (is_array($p_file_list) && count($p_list_detail) == count($p_file_list)) {
          return true;
        }
      }
    }
    return true;
  }

  /**
   * @return bool
   */
  public function _openAppend() {
    if (filesize($this->_tarname) == 0) {
      return $this
        ->_openWrite();
    }
    if ($this->_compress) {
      $this
        ->_close();
      if (!@rename($this->_tarname, $this->_tarname . ".tmp")) {
        $this
          ->_error('Error while renaming \'' . $this->_tarname . '\' to temporary file \'' . $this->_tarname . '.tmp\'');
        return false;
      }
      if ($this->_compress_type == 'gz') {
        $v_temp_tar = @gzopen($this->_tarname . ".tmp", "rb");
      }
      elseif ($this->_compress_type == 'bz2') {
        $v_temp_tar = @bzopen($this->_tarname . ".tmp", "r");
      }
      elseif ($this->_compress_type == 'lzma2') {
        $v_temp_tar = @xzopen($this->_tarname . ".tmp", "r");
      }
      if ($v_temp_tar == 0) {
        $this
          ->_error('Unable to open file \'' . $this->_tarname . '.tmp\' in binary read mode');
        @rename($this->_tarname . ".tmp", $this->_tarname);
        return false;
      }
      if (!$this
        ->_openWrite()) {
        @rename($this->_tarname . ".tmp", $this->_tarname);
        return false;
      }
      if ($this->_compress_type == 'gz') {
        $end_blocks = 0;
        while (!@gzeof($v_temp_tar)) {
          $v_buffer = @gzread($v_temp_tar, 512);
          if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
            $end_blocks++;

            // do not copy end blocks, we will re-make them
            // after appending
            continue;
          }
          elseif ($end_blocks > 0) {
            for ($i = 0; $i < $end_blocks; $i++) {
              $this
                ->_writeBlock(ARCHIVE_TAR_END_BLOCK);
            }
            $end_blocks = 0;
          }
          $v_binary_data = pack("a512", $v_buffer);
          $this
            ->_writeBlock($v_binary_data);
        }
        @gzclose($v_temp_tar);
      }
      elseif ($this->_compress_type == 'bz2') {
        $end_blocks = 0;
        while (strlen($v_buffer = @bzread($v_temp_tar, 512)) > 0) {
          if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
            $end_blocks++;

            // do not copy end blocks, we will re-make them
            // after appending
            continue;
          }
          elseif ($end_blocks > 0) {
            for ($i = 0; $i < $end_blocks; $i++) {
              $this
                ->_writeBlock(ARCHIVE_TAR_END_BLOCK);
            }
            $end_blocks = 0;
          }
          $v_binary_data = pack("a512", $v_buffer);
          $this
            ->_writeBlock($v_binary_data);
        }
        @bzclose($v_temp_tar);
      }
      elseif ($this->_compress_type == 'lzma2') {
        $end_blocks = 0;
        while (strlen($v_buffer = @xzread($v_temp_tar, 512)) > 0) {
          if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
            $end_blocks++;

            // do not copy end blocks, we will re-make them
            // after appending
            continue;
          }
          elseif ($end_blocks > 0) {
            for ($i = 0; $i < $end_blocks; $i++) {
              $this
                ->_writeBlock(ARCHIVE_TAR_END_BLOCK);
            }
            $end_blocks = 0;
          }
          $v_binary_data = pack("a512", $v_buffer);
          $this
            ->_writeBlock($v_binary_data);
        }
        @xzclose($v_temp_tar);
      }
      if (!@drupal_unlink($this->_tarname . ".tmp")) {
        $this
          ->_error('Error while deleting temporary file \'' . $this->_tarname . '.tmp\'');
      }
    }
    else {

      // ----- For not compressed tar, just add files before the last
      //       one or two 512 bytes block
      if (!$this
        ->_openReadWrite()) {
        return false;
      }
      clearstatcache();
      $v_size = filesize($this->_tarname);

      // We might have zero, one or two end blocks.
      // The standard is two, but we should try to handle
      // other cases.
      fseek($this->_file, $v_size - 1024);
      if (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
        fseek($this->_file, $v_size - 1024);
      }
      elseif (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
        fseek($this->_file, $v_size - 512);
      }
    }
    return true;
  }

  /**
   * @param $p_filelist
   * @param string $p_add_dir
   * @param string $p_remove_dir
   * @return bool
   */
  public function _append($p_filelist, $p_add_dir = '', $p_remove_dir = '') {
    if (!$this
      ->_openAppend()) {
      return false;
    }
    if ($this
      ->_addList($p_filelist, $p_add_dir, $p_remove_dir)) {
      $this
        ->_writeFooter();
    }
    $this
      ->_close();
    return true;
  }

  /**
   * Check if a directory exists and create it (including parent
   * dirs) if not.
   *
   * @param string $p_dir directory to check
   *
   * @return bool true if the directory exists or was created
   */
  public function _dirCheck($p_dir) {
    clearstatcache();
    if (@is_dir($p_dir) || $p_dir == '') {
      return true;
    }
    $p_parent_dir = dirname($p_dir);
    if ($p_parent_dir != $p_dir && $p_parent_dir != '' && !$this
      ->_dirCheck($p_parent_dir)) {
      return false;
    }
    if (!@mkdir($p_dir, 0777)) {
      $this
        ->_error("Unable to create directory '{$p_dir}'");
      return false;
    }
    return true;
  }

  /**
   * Compress path by changing for example "/dir/foo/../bar" to "/dir/bar",
   * rand emove double slashes.
   *
   * @param string $p_dir path to reduce
   *
   * @return string reduced path
   */
  private function _pathReduction($p_dir) {
    $v_result = '';

    // ----- Look for not empty path
    if ($p_dir != '') {

      // ----- Explode path by directory names
      $v_list = explode('/', $p_dir);

      // ----- Study directories from last to first
      for ($i = sizeof($v_list) - 1; $i >= 0; $i--) {

        // ----- Look for current path
        if ($v_list[$i] == ".") {

          // ----- Ignore this directory
          // Should be the first $i=0, but no check is done
        }
        else {
          if ($v_list[$i] == "..") {

            // ----- Ignore it and ignore the $i-1
            $i--;
          }
          else {
            if ($v_list[$i] == '' && $i != sizeof($v_list) - 1 && $i != 0) {

              // ----- Ignore only the double '//' in path,
              // but not the first and last /
            }
            else {
              $v_result = $v_list[$i] . ($i != sizeof($v_list) - 1 ? '/' . $v_result : '');
            }
          }
        }
      }
    }
    if (defined('OS_WINDOWS') && OS_WINDOWS) {
      $v_result = strtr($v_result, '\\', '/');
    }
    return $v_result;
  }

  /**
   * @param $p_path
   * @param bool $p_remove_disk_letter
   * @return string
   */
  public function _translateWinPath($p_path, $p_remove_disk_letter = true) {
    if (defined('OS_WINDOWS') && OS_WINDOWS) {

      // ----- Look for potential disk letter
      if ($p_remove_disk_letter && ($v_position = strpos($p_path, ':')) != false) {
        $p_path = substr($p_path, $v_position + 1);
      }

      // ----- Change potential windows directory separator
      if (strpos($p_path, '\\') > 0 || substr($p_path, 0, 1) == '\\') {
        $p_path = strtr($p_path, '\\', '/');
      }
    }
    return $p_path;
  }

}