/libraries/pear/archive_tar/Archive_Tar.php

<?php
/* vim: set ts=4 sw=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4														|
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group								|
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,		|
// | that is bundled with this package in the file LICENSE, and is		|
// | available through the world-wide-web at the following url:			|
// | http://www.php.net/license/3_0.txt.								  |
// | If you did not receive a copy of the PHP license and are unable to	|
// | obtain it through the world-wide-web, please send a note to		  |
// | license@php.net so we can mail you a copy immediately.				|
// +----------------------------------------------------------------------+
// | Author: Vincent Blavet <vincent@blavet.net>						  |
// +----------------------------------------------------------------------+
//
// $Id: Tar.php 6474 2007-02-03 10:47:26Z pasamio $

// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

jimport('pear.PEAR');

define ('ARCHIVE_TAR_ATT_SEPARATOR', 90001);

/**
* Creates a (compressed) Tar archive
*
* @author	Vincent Blavet <vincent@blavet.net>
* @version  $Revision: 47 $
* @package  Archive
*/
class Archive_Tar extends PEAR
{
	/**
	* @var string Name of the Tar
	*/
	var $_tarname='';

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

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

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

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

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

	// {{{ constructor
	/**
	* 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  $p_compress can be null, 'gz' or 'bz2'. This
	*					parameter indicates if gzip or bz2 compression
	*					is required.  For compatibility reason the
	*					boolean value 'true' means 'gz'.
	* @access public
	*/
	function Archive_Tar($p_tarname, $p_compress = null)
	{
		$this->PEAR();
		$this->_compress = false;
		$this->_compress_type = 'none';
		if ($p_compress === null) {
			if (@file_exists($p_tarname)) {
				if ($fp = @fopen($p_tarname, "rb")) {
					// look for gzip magic cookie
					$data = fread($fp, 2);
					fclose($fp);
					if ($data == "\37\213") {
						$this->_compress = true;
						$this->_compress_type = 'gz';
					// No sure it's enought for a magic code ....
					} elseif ($data == "BZ") {
						$this->_compress = true;
						$this->_compress_type = 'bz2';
					}
				}
			} else {
				// probably a remote file or some file accessible
				// through a stream interface
				if (substr($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;
					$this->_compress_type = 'bz2';
				}
			}
		} else {
			if (($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';
			}
		}
		$this->_tarname = $p_tarname;
		if ($this->_compress) { // assert zlib or bz2 extension support
			if ($this->_compress_type == 'gz')
				$extname = 'zlib';
			else if ($this->_compress_type == 'bz2')
				$extname = 'bz2';

			if (!extension_loaded($extname)) {
				PEAR::loadExtension($extname);
			}
			if (!extension_loaded($extname)) {
				die("The extension '$extname' couldn't be found.\n".
					"Please make sure your version of PHP was built ".
					"with '$extname' support.\n");
				return false;
			}
		}
	}
	// }}}

	// {{{ destructor
	function _Archive_Tar()
	{
		$this->_close();
		// ----- Look for a local copy to delete
		if ($this->_temp_tarname != '')
			@unlink($this->_temp_tarname);
		$this->_PEAR();
	}
	// }}}

	// {{{ create()
	/**
	* 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  $p_filelist An array of filenames and directory names, or a single
	*							string with names separated by a single blank space.
	* @return					true on success, false on error.
	* @see createModify()
	* @access public
	*/
	function create($p_filelist)
	{
		return $this->createModify($p_filelist, '', '');
	}
	// }}}

	// {{{ add()
	/**
	* 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  $p_filelist An array of filenames and directory names, or a single
	*							string with names separated by a single blank space.
	* @return					true on success, false on error.
	* @see createModify()
	* @access public
	*/
	function add($p_filelist)
	{
		return $this->addModify($p_filelist, '', '');
	}
	// }}}

	// {{{ extract()
	function extract($p_path='')
	{
		return $this->extractModify($p_path, '');
	}
	// }}}

	// {{{ listContent()
	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;
	}
	// }}}

	// {{{ createModify()
	/**
	* 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 $p_remove_dir	A string which contains a path to be removed from
	*								the memorized path of each element in the list, when
	*								relevant.
	* @return boolean				true on success, false on error.
	* @access public
	* @see addModify()
	*/
	function createModify($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;
	}
	// }}}

	// {{{ addModify()
	/**
	* 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	 $p_remove_dir	A string which contains a path to be removed from
	*									the memorized path of each element in the list, when
	*									relevant.
	* @return							true on success, false on error.
	* @access public
	*/
	function addModify($p_filelist, $p_add_dir, $p_remove_dir='')
	{
		$v_result = true;

		if (!@is_file($this->_tarname))
			$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;
	}
	// }}}

	// {{{ addString()
	/**
	* 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	 $p_string		The content of the file added in the archive.
	* @return							true on success, false on error.
	* @access public
	*/
	function addString($p_filename, $p_string)
	{
		$v_result = true;

		if (!@is_file($this->_tarname)) {
			if (!$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);

		$this->_writeFooter();

		$this->_close();

		return $v_result;
	}
	// }}}

	// {{{ extractModify()
	/**
	* 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 $p_remove_path  Part of the memorized path that can be removed if
	*								present at the beginning of the file/dir path.
	* @return boolean				true on success, false on error.
	* @access public
	* @see extractList()
	*/
	function extractModify($p_path, $p_remove_path)
	{
		$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);
			$this->_close();
		}

		return $v_result;
	}
	// }}}

	// {{{ extractInString()
	/**
	* 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 $p_filename	 The path of the file to extract in a string.
	* @return						a string with the file content or NULL.
	* @access public
	*/
	function extractInString($p_filename)
	{
		if ($this->_openRead()) {
			$v_result = $this->_extractInString($p_filename);
			$this->_close();
		} else {
			$v_result = NULL;
		}

		return $v_result;
	}
	// }}}

	// {{{ extractList()
	/**
	* 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 $p_remove_path  Part of the memorized path that can be removed if
	*								present at the beginning of the file/dir path.
	* @return						true on success, false on error.
	* @access public
	* @see extractModify()
	*/
	function extractList($p_filelist, $p_path='', $p_remove_path='')
	{
		$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);
			$this->_close();
		}

		return $v_result;
	}
	// }}}

	// {{{ setAttribute()
	/**
	* 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, ',');
	* @param mixed $argv			variable list of attributes and values
	* @return						true on success, false on error.
	* @access 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 :
					$this->_error('Unknow attribute code '.$v_att_list[$i].'');
					return false;
			}

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

		return $v_result;
	}
	// }}}

	// {{{ _error()
	function _error($p_message)
	{
		// ----- To be completed
		$this->raiseError($p_message);
	}
	// }}}

	// {{{ _warning()
	function _warning($p_message)
	{
		// ----- To be completed
		$this->raiseError($p_message);
	}
	// }}}

	// {{{ _openWrite()
	function _openWrite()
	{
		if ($this->_compress_type == 'gz')
			$this->_file = @gzopen($this->_tarname, "wb");
		else if ($this->_compress_type == 'bz2')
			$this->_file = @bzopen($this->_tarname, "wb");
		else if ($this->_compress_type == 'none')
			$this->_file = @fopen($this->_tarname, "wb");
		else
			$this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

		if ($this->_file == 0) {
			$this->_error('Unable to open in write mode \''.$this->_tarname.'\'');
			return false;
		}

		return true;
	}
	// }}}

	// {{{ _openRead()
	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')
			$this->_file = @gzopen($v_filename, "rb");
		else if ($this->_compress_type == 'bz2')
			$this->_file = @bzopen($v_filename, "rb");
		else if ($this->_compress_type == 'none')
			$this->_file = @fopen($v_filename, "rb");
		else
			$this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

		if ($this->_file == 0) {
			$this->_error('Unable to open in read mode \''.$v_filename.'\'');
			return false;
		}

		return true;
	}
	// }}}

	// {{{ _openReadWrite()
	function _openReadWrite()
	{
		if ($this->_compress_type == 'gz')
			$this->_file = @gzopen($this->_tarname, "r+b");
		else if ($this->_compress_type == 'bz2')
			$this->_file = @bzopen($this->_tarname, "r+b");
		else if ($this->_compress_type == 'none')
			$this->_file = @fopen($this->_tarname, "r+b");
		else
			$this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

		if ($this->_file == 0) {
			$this->_error('Unable to open in read/write mode \''.$this->_tarname.'\'');
			return false;
		}

		return true;
	}
	// }}}

	// {{{ _close()
	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 ($this->_compress_type == 'none')
				@fclose($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 ($this->_temp_tarname != '') {
			@unlink($this->_temp_tarname);
			$this->_temp_tarname = '';
		}

		return true;
	}
	// }}}

	// {{{ _cleanFile()
	function _cleanFile()
	{
		$this->_close();

		// ----- Look for a local copy
		if ($this->_temp_tarname != '') {
			// ----- Remove the local copy but not the remote tarname
			@unlink($this->_temp_tarname);
			$this->_temp_tarname = '';
		} else {
			// ----- Remove the local tarname file
			@unlink($this->_tarname);
		}
		$this->_tarname = '';

		return true;
	}
	// }}}

	// {{{ _writeBlock()
	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 == '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 == 'none')
				  @fputs($this->_file, $p_binary_data, $p_len);
			  else
				  $this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

		  }
	  }
	  return true;
	}
	// }}}

	// {{{ _readBlock()
	function _readBlock($p_len=null)
	{
	  $v_block = null;
	  if (is_resource($this->_file)) {
		  if ($p_len === null)
			  $p_len = 512;

		  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 == 'none')
			  $v_block = @fread($this->_file, 512);
		  else
			  $this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

	  }
	  return $v_block;
	}
	// }}}

	// {{{ _jumpBlock()
	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 == 'none')
			  @fseek($this->_file, @ftell($this->_file)+($p_len*512));
		  else
			  $this->_error('Unknown or missing compression type ('.$this->_compress_type.')');

	  }
	  return true;
	}
	// }}}

	// {{{ _writeFooter()
	function _writeFooter()
	{
	  if (is_resource($this->_file)) {
		  // ----- Write the last 0 filled block for end of archive
		  $v_binary_data = pack("a512", '');
		  $this->_writeBlock($v_binary_data);
	  }
	  return true;
	}
	// }}}

	// {{{ _addList()
	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;

	  for ($j=0; ($j<count($p_list)) && ($v_result); $j++) {
		$v_filename = $p_list[$j];

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

		if ($v_filename == '')
			continue;

		if (!file_exists($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($v_filename)) {
			if (!($p_hdir = opendir($v_filename))) {
				$this->_warning("Directory '$v_filename' can not be read");
				continue;
			}
			$p_hitem = readdir($p_hdir); // '.' directory
			$p_hitem = readdir($p_hdir); // '..' directory
			while (false !== ($p_hitem = readdir($p_hdir))) {
				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;
	}
	// }}}

	// {{{ _addFile()
	function _addFile($p_filename, &$p_header, $p_add_dir, $p_remove_dir)
	{
	  if (!$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);;
	  $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 (is_file($p_filename)) {
		  if (($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;
	}
	// }}}

	// {{{ _addString()
	function _addString($p_filename, $p_string)
	{
	  if (!$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 (!$this->_writeHeaderBlock($p_filename, strlen($p_string), 0, 0, "", 0, 0))
		  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;
	}
	// }}}

	// {{{ _writeHeader()
	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;
		}

		$v_info = stat($p_filename);
		$v_uid = sprintf("%6s ", DecOct($v_info[4]));
		$v_gid = sprintf("%6s ", DecOct($v_info[5]));
		$v_perms = sprintf("%6s ", DecOct(fileperms($p_filename)));

		$v_mtime = sprintf("%11s", DecOct(filemtime($p_filename)));

		if (@is_dir($p_filename)) {
		  $v_typeflag = "5";
		  $v_size = sprintf("%11s ", DecOct(0));
		} else {
		  $v_typeflag = '';
		  clearstatcache();
		  $v_size = sprintf("%11s ", DecOct(filesize($p_filename)));
		}

		$v_linkname = '';

		$v_magic = '';

		$v_version = '';

		$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
		$v_checksum = sprintf("%6s ", DecOct($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;
	}
	// }}}

	// {{{ _writeHeaderBlock()
	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("%11s ", DecOct(0));
		} else {
		  $v_size = sprintf("%11s ", DecOct($p_size));
		}

		$v_uid = sprintf("%6s ", DecOct($p_uid));
		$v_gid = sprintf("%6s ", DecOct($p_gid));
		$v_perms = sprintf("%6s ", DecOct($p_perms));

		$v_mtime = sprintf("%11s", DecOct($p_mtime));

		$v_linkname = '';

		$v_magic = '';

		$v_version = '';

		$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
		$v_checksum = sprintf("%6s ", DecOct($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;
	}
	// }}}

	// {{{ _writeLongHeader()
	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
		$v_checksum = sprintf("%6s ", DecOct($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;
	}
	// }}}

	// {{{ _readHeader()
	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;
		}

		// ----- 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));

		$v_data = unpack("a100filename/a8mode/a8uid/a8gid/a12size/a12mtime/a8checksum/a1typeflag/a100link/a6magic/a2version/a32uname/a32gname/a8devmajor/a8devminor", $v_binary_data);

		// ----- 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
		$v_header['filename'] = trim($v_data['filename']);
		$v_header['mode'] = OctDec(trim($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;
		}
		/* ----- All these fields are removed form the header because they do not carry interesting info
		$v_header[link] = trim($v_data[link]);
		$v_header[magic] = trim($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;
	}
	// }}}

	// {{{ _readLongHeader()
	function _readLongHeader(&$v_header)
	{
	  $v_filename = '';
	  $n = floor($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_header['filename'] = $v_filename;

	  return true;
	}
	// }}}

	// {{{ _extractInString()
	/**
	* 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 $p_filename	 The path of the file to extract in a string.
	* @return						a string with the file content or NULL.
	* @access private
	*/
	function _extractInString($p_filename)
	{
		$v_result_str = "";
		$v_header = array();

		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;
	}
	// }}}

	// {{{ _extractList()
	function _extractList($p_path, &$p_list_detail, $p_mode, $p_file_list, $p_remove_path)
	{
	$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();

	$v_header = array();
	While (strlen($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;
	  }

	  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;
			}
		  }

		  // ----- It is a file, so compare the file names
		  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'], $p_remove_path_size);
		if (($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 ((is_file($v_header['filename'])) && ($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 ?
		  }
		}

		// ----- Check the directory availability and create it if necessary
		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;
				}
			}
		  } 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);

			// ----- Change the file mode, mtime
			@touch($v_header['filename'], $v_header['mtime']);
			// To be completed
			//chmod($v_header[filename], DecOct($v_header[mode]));
		  }

		  // ----- Check the file size
		  clearstatcache();
		  if (filesize($v_header['filename']) != $v_header['size']) {
			  $this->_error('Extracted file '.$v_header['filename'].' does not have the correct file size \''.filesize($v_header['filename']).'\' ('.$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;
	  }
	}

		return true;
	}
	// }}}

	// {{{ _openAppend()
	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", "rb");

			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') {
				$v_buffer = @gzread($v_temp_tar, 512);

				// ----- Read the following blocks but not the last one
				if (!@gzeof($v_temp_tar)) {
					do{
						$v_binary_data = pack("a512", $v_buffer);
						$this->_writeBlock($v_binary_data);
						$v_buffer = @gzread($v_temp_tar, 512);

					} while (!@gzeof($v_temp_tar));
				}

				@gzclose($v_temp_tar);
			}
			elseif ($this->_compress_type == 'bz2') {
				$v_buffered_lines	= array();
				$v_buffered_lines[] = @bzread($v_temp_tar, 512);

				// ----- Read the following blocks but not the last one
				while (strlen($v_buffered_lines[] = @bzread($v_temp_tar, 512)) > 0) {
					$v_binary_data = pack("a512", array_shift($v_buffered_lines));
					$this->_writeBlock($v_binary_data);
				}

				@bzclose($v_temp_tar);
			}

			if (!@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 512 bytes block
			if (!$this->_openReadWrite())
				return false;

			clearstatcache();
			$v_size = filesize($this->_tarname);
			fseek($this->_file, $v_size-512);
		}

		return true;
	}
	// }}}

	// {{{ _append()
	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;
	}
	// }}}

	// {{{ _dirCheck()

	/**
	 * Check if a directory exists and create it (including parent
	 * dirs) if not.
	 *
	 * @param string $p_dir directory to check
	 *
	 * @return bool TRUE if the directory exists or was created
	 */
	function _dirCheck($p_dir)
	{
		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;
	}

	// }}}

	// {{{ _pathReduction()

	/**
	 * Compress path by changing for example "/dir/foo/../bar" to "/dir/bar", and
	 * remove double slashes.
	 *
	 * @param string $p_dir path to reduce
	 *
	 * @return string reduced path
	 *
	 * @access private
	 *
	 */
	function _pathReduction($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:'');
				}
			}
		}
		$v_result = strtr($v_result, '\\', '/');
		return $v_result;
	}

	// }}}

	// {{{ _translateWinPath()
	function _translateWinPath($p_path, $p_remove_disk_letter=true)
	{
	  if (OS_WINDOWS) {
		  // ----- Look for potential disk letter
		  if (($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;
	}
	// }}}

}
?>