"TYPO3 4.0.1: typo3_src-4.0.1/typo3/mod/tools/em/class.em_unzip.php Source File", "datetime" => "Sat Dec 2 19:22:21 2006", "date" => "2 Dec 2006", "doxygenversion" => "1.4.6", "projectname" => "TYPO3 4.0.1", "projectnumber" => "4.0.1" ); get_header($doxygen_vars); ?>

class.em_unzip.php

<?php
/***************************************************************
*  Copyright notice
*
*  (c) Vincent Blavet <vincent@phpconcept.net>
*  (c) 2005-2006 Karsten Dambekalns <karsten@typo3.org>
*  All rights reserved
*
*  This library is free software; you can redistribute it and/or
*  modify it under the terms of the GNU Lesser General Public
*  License as published by the Free Software Foundation; either
*  version 2.1 of the License, or (at your option) any later version.
*
*  This library is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
*  Lesser General Public License for more details.
*
*  You should have received a copy of the GNU Lesser General Public
*  License along with this library; if not, write to the Free Software
*  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
*  MA  02110-1301  USA
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/
// Constants
define( 'ARCHIVE_ZIP_READ_BLOCK_SIZE', 2048 );

// File list separator
define( 'ARCHIVE_ZIP_SEPARATOR', ',' );

define( 'ARCHIVE_ZIP_TEMPORARY_DIR', '' );

// Error codes
define( 'ARCHIVE_ZIP_ERR_NO_ERROR', 0 );
define( 'ARCHIVE_ZIP_ERR_WRITE_OPEN_FAIL', -1 );
define( 'ARCHIVE_ZIP_ERR_READ_OPEN_FAIL', -2 );
define( 'ARCHIVE_ZIP_ERR_INVALID_PARAMETER', -3 );
define( 'ARCHIVE_ZIP_ERR_MISSING_FILE', -4 );
define( 'ARCHIVE_ZIP_ERR_FILENAME_TOO_LONG', -5 );
define( 'ARCHIVE_ZIP_ERR_INVALID_ZIP', -6 );
define( 'ARCHIVE_ZIP_ERR_BAD_EXTRACTED_FILE', -7 );
define( 'ARCHIVE_ZIP_ERR_DIR_CREATE_FAIL', -8 );
define( 'ARCHIVE_ZIP_ERR_BAD_EXTENSION', -9 );
define( 'ARCHIVE_ZIP_ERR_BAD_FORMAT', -10 );
define( 'ARCHIVE_ZIP_ERR_DELETE_FILE_FAIL', -11 );
define( 'ARCHIVE_ZIP_ERR_RENAME_FILE_FAIL', -12 );
define( 'ARCHIVE_ZIP_ERR_BAD_CHECKSUM', -13 );
define( 'ARCHIVE_ZIP_ERR_INVALID_ARCHIVE_ZIP', -14 );
define( 'ARCHIVE_ZIP_ERR_MISSING_OPTION_VALUE', -15 );
define( 'ARCHIVE_ZIP_ERR_INVALID_PARAM_VALUE', -16 );

// Warning codes
define( 'ARCHIVE_ZIP_WARN_NO_WARNING', 0 );
define( 'ARCHIVE_ZIP_WARN_FILE_EXIST', 1 );

// Methods parameters
define( 'ARCHIVE_ZIP_PARAM_PATH', 'path' );
define( 'ARCHIVE_ZIP_PARAM_ADD_PATH', 'add_path' );
define( 'ARCHIVE_ZIP_PARAM_REMOVE_PATH', 'remove_path' );
define( 'ARCHIVE_ZIP_PARAM_REMOVE_ALL_PATH', 'remove_all_path' );
define( 'ARCHIVE_ZIP_PARAM_SET_CHMOD', 'set_chmod' );
define( 'ARCHIVE_ZIP_PARAM_EXTRACT_AS_STRING', 'extract_as_string' );
define( 'ARCHIVE_ZIP_PARAM_NO_COMPRESSION', 'no_compression' );

define( 'ARCHIVE_ZIP_PARAM_PRE_EXTRACT', 'callback_pre_extract' );
define( 'ARCHIVE_ZIP_PARAM_POST_EXTRACT', 'callback_post_extract' );
define( 'ARCHIVE_ZIP_PARAM_PRE_ADD', 'callback_pre_add' );
define( 'ARCHIVE_ZIP_PARAM_POST_ADD', 'callback_post_add' );



class em_unzip {
        var $_zipname='';

        var $_zip_fd=0;

        var $_error_code=1;

        var $_error_string='';

        function em_unzip($p_zipname) {

                // Check the zlib
                if (!extension_loaded('zlib')) {
                        die("The extension 'zlib' couldn't be found.\n".
                        "Please make sure your version of PHP was built ".
                        "with 'zlib' support.\n");
                }

                // Set the attributes
                $this->_zipname = $p_zipname;
                $this->_zip_fd = 0;

                return;
        }



        function extract($p_params=0) {
                $this->_errorReset();

                // Check archive
                if (!$this->_checkFormat()) {
                        return(0);
                }

                // Set default values
                if ($p_params === 0) {
                        $p_params = array();
                }
                if ($this->_check_parameters($p_params,
                array ('extract_as_string' => false,
                'add_path' => '',
                'remove_path' => '',
                'remove_all_path' => false,
                'callback_pre_extract' => '',
                'callback_post_extract' => '',
                'set_chmod' => 0) ) != 1) {
                        return 0;
                }

                // Call the extracting fct
                $v_list = array();
                if ($this->_extractByRule($v_list, $p_params) != 1) {
                        unset($v_list);
                        return(0);
                }

                return $v_list;
        }

        function errorCode() {
                return($this->_error_code);
        }

        function errorName($p_with_code=false) {
                $v_const_list = get_defined_constants();

                // Extract error constants from all const.
                for (reset($v_const_list);
                list($v_key, $v_value) = each($v_const_list);) {
                        if (substr($v_key, 0, strlen('ARCHIVE_ZIP_ERR_')) =='ARCHIVE_ZIP_ERR_') {
                                $v_error_list[$v_key] = $v_value;
                        }
                }

                // Search the name form the code value
                $v_key=array_search($this->_error_code, $v_error_list, true);
                if ($v_key!=false) {
                        $v_value = $v_key;
                } else {
                        $v_value = 'NoName';
                }

                if ($p_with_code) {
                        return($v_value.' ('.$this->_error_code.')');
                } else {
                        return($v_value);
                }
        }

        function errorInfo($p_full=false) {
                if ($p_full) {
                        return($this->errorName(true)." : ".$this->_error_string);
                } else {
                        return($this->_error_string." [code ".$this->_error_code."]");
                }
        }


        function _checkFormat($p_level=0) {
                $v_result = true;

                // Reset the error handler
                $this->_errorReset();

                // Look if the file exits
                if (!is_file($this->_zipname)) {
                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_MISSING_FILE,
                        "Missing archive file '".$this->_zipname."'");
                        return(false);
                }

                // Check that the file is readeable
                if (!is_readable($this->_zipname)) {
                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_READ_OPEN_FAIL,
                        "Unable to read archive '".$this->_zipname."'");
                        return(false);
                }

                // Check the magic code
                // TBC

                // Check the central header
                // TBC

                // Check each file header
                // TBC

                // Return
                return $v_result;
        }


        function _openFd($p_mode) {
                $v_result=1;

                // Look if already open
                if ($this->_zip_fd != 0) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_READ_OPEN_FAIL,
                        'Zip file \''.$this->_zipname.'\' already open');
                        return em_unzip::errorCode();
                }

                // Open the zip file
                if (($this->_zip_fd = @fopen($this->_zipname, $p_mode)) == 0) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_READ_OPEN_FAIL,
                        'Unable to open archive \''.$this->_zipname
                        .'\' in '.$p_mode.' mode');
                        return em_unzip::errorCode();
                }

                // Return
                return $v_result;
        }

        function _closeFd() {
                $v_result=1;

                if ($this->_zip_fd != 0)
                @fclose($this->_zip_fd);
                $this->_zip_fd = 0;

                // Return
                return $v_result;
        }



        function _convertHeader2FileInfo($p_header, &$p_info) {
                $v_result=1;

                // Get the interesting attributes
                $p_info['filename'] = $p_header['filename'];
                $p_info['stored_filename'] = $p_header['stored_filename'];
                $p_info['size'] = $p_header['size'];
                $p_info['compressed_size'] = $p_header['compressed_size'];
                $p_info['mtime'] = $p_header['mtime'];
                $p_info['comment'] = $p_header['comment'];
                $p_info['folder'] = (($p_header['external']&0x00000010)==0x00000010);
                $p_info['index'] = $p_header['index'];
                $p_info['status'] = $p_header['status'];

                // Return
                return $v_result;
        }


        // Function : _extractByRule()
        // Description :
        //   Extract a file or directory depending of rules (by index, by name, ...)
        // Parameters :
        //   $p_file_list : An array where will be placed the properties of each
        //                  extracted file
        //   $p_path : Path to add while writing the extracted files
        //   $p_remove_path : Path to remove (from the file memorized path) while writing the
        //                    extracted files. If the path does not match the file path,
        //                    the file is extracted with its memorized path.
        //                    $p_remove_path does not apply to 'list' mode.
        //                    $p_path and $p_remove_path are commulative.
        // Return Values :
        //   1 on success,0 or less on error (see error code list)

        function _extractByRule(&$p_file_list, &$p_params)
        {
                $v_result=1;

                $p_path = $p_params['add_path'];
                $p_remove_path = $p_params['remove_path'];
                $p_remove_all_path = $p_params['remove_all_path'];

                // Check the path
                if (($p_path == "")
                || ((substr($p_path, 0, 1) != "/")
                && (substr($p_path, 0, 3) != "../") && (substr($p_path,1,2)!=":/")))
                $p_path = "./".$p_path;

                // Reduce the path last (and duplicated) '/'
                if (($p_path != "./") && ($p_path != "/")) {
                        // Look for the path end '/'
                        while (substr($p_path, -1) == "/") {
                                $p_path = substr($p_path, 0, strlen($p_path)-1);
                        }
                }

                // Open the zip file
                if (($v_result = $this->_openFd('rb')) != 1)
                {
                        return $v_result;
                }

                // Read the central directory informations
                $v_central_dir = array();
                if (($v_result = $this->_readEndCentralDir($v_central_dir)) != 1)
                {
                        // Close the zip file
                        $this->_closeFd();

                        return $v_result;
                }

                // Start at beginning of Central Dir
                $v_pos_entry = $v_central_dir['offset'];

                // Read each entry
                $j_start = 0;
                for ($i=0, $v_nb_extracted=0; $i<$v_central_dir['entries']; $i++) {
                        // Read next Central dir entry
                        @rewind($this->_zip_fd);
                        if (@fseek($this->_zip_fd, $v_pos_entry)) {
                                $this->_closeFd();

                                $this->_errorLog(ARCHIVE_ZIP_ERR_INVALID_ARCHIVE_ZIP,
                                'Invalid archive size');

                                return em_unzip::errorCode();
                        }

                        // Read the file header
                        $v_header = array();
                        if (($v_result = $this->_readCentralFileHeader($v_header)) != 1) {
                                $this->_closeFd();

                                return $v_result;
                        }

                        // Store the index
                        $v_header['index'] = $i;

                        // Store the file position
                        $v_pos_entry = ftell($this->_zip_fd);


                        // Go to the file position
                        @rewind($this->_zip_fd);
                        if (@fseek($this->_zip_fd, $v_header['offset']))
                        {
                                // Close the zip file
                                $this->_closeFd();

                                // Error log
                                $this->_errorLog(ARCHIVE_ZIP_ERR_INVALID_ARCHIVE_ZIP, 'Invalid archive size');

                                // Return
                                return em_unzip::errorCode();
                        }

                        // Extracting the file
                        if (($v_result = $this->_extractFile($v_header, $p_path, $p_remove_path, $p_remove_all_path, $p_params)) != 1)
                        {
                                // Close the zip file
                                $this->_closeFd();

                                return $v_result;
                        }

                        // Get the only interesting attributes
                        if (($v_result = $this->_convertHeader2FileInfo($v_header, $p_file_list[$v_nb_extracted++])) != 1)
                        {
                                // Close the zip file
                                $this->_closeFd();

                                return $v_result;
                        }
                }

                // Close the zip file
                $this->_closeFd();

                // Return
                return $v_result;
        }

        function _extractFile(&$p_entry, $p_path, $p_remove_path, $p_remove_all_path, &$p_params) {
                $v_result=1;

                // Read the file header
                if (($v_result = $this->_readFileHeader($v_header)) != 1)
                {
                        // Return
                        return $v_result;
                }


                // Check that the file header is coherent with $p_entry info
                // TBC

                // Look for all path to remove
                if ($p_remove_all_path == true) {
                        // Get the basename of the path
                        $p_entry['filename'] = basename($p_entry['filename']);
                }

                // Look for path to remove
                else if ($p_remove_path != "")
                {
                        //if (strcmp($p_remove_path, $p_entry['filename'])==0)
                        if ($this->_tool_PathInclusion($p_remove_path, $p_entry['filename']) == 2)
                        {

                                // Change the file status
                                $p_entry['status'] = "filtered";

                                // Return
                                return $v_result;
                        }

                        $p_remove_path_size = strlen($p_remove_path);
                        if (substr($p_entry['filename'], 0, $p_remove_path_size) == $p_remove_path)
                        {

                                // Remove the path
                                $p_entry['filename'] = substr($p_entry['filename'], $p_remove_path_size);

                        }
                }

                // Add the path
                if ($p_path != '')
                {
                        $p_entry['filename'] = $p_path."/".$p_entry['filename'];
                }

                // Look for pre-extract callback
                if (   (isset($p_params[ARCHIVE_ZIP_PARAM_PRE_EXTRACT]))
                && ($p_params[ARCHIVE_ZIP_PARAM_PRE_EXTRACT] != '')) {

                        // Generate a local information
                        $v_local_header = array();
                        $this->_convertHeader2FileInfo($p_entry, $v_local_header);

                        // Call the callback
                        // Here I do not use call_user_func() because I need to send a reference to the
                        // header.
                        eval('$v_result = '.$p_params[ARCHIVE_ZIP_PARAM_PRE_EXTRACT].'(ARCHIVE_ZIP_PARAM_PRE_EXTRACT, $v_local_header);');
                        if ($v_result == 0) {
                                // Change the file status
                                $p_entry['status'] = "skipped";
                                $v_result = 1;
                        }

                        // Update the informations
                        // Only some fields can be modified
                        $p_entry['filename'] = $v_local_header['filename'];
                }

                // Trace

                // Look if extraction should be done
                if ($p_entry['status'] == 'ok') {

                        // Look for specific actions while the file exist
                        if (file_exists($p_entry['filename'])) {
                                // Look if file is a directory
                                if (is_dir($p_entry['filename'])) {
                                        // Change the file status
                                        $p_entry['status'] = "already_a_directory";

                                        // Return
                                        //return $v_result;
                                }
                                // Look if file is write protected
                                else if (!is_writeable($p_entry['filename'])) {
                                        // Change the file status
                                        $p_entry['status'] = "write_protected";

                                        // Return
                                        //return $v_result;
                                }

                                // Look if the extracted file is older
                                else if (filemtime($p_entry['filename']) > $p_entry['mtime']) {
                                        // Change the file status
                                        $p_entry['status'] = "newer_exist";

                                        // Return
                                        //return $v_result;
                                }
                        }

                        // Check the directory availability and create it if necessary
                        else {
                                if ((($p_entry['external']&0x00000010)==0x00000010) || (substr($p_entry['filename'], -1) == '/'))
                                $v_dir_to_check = $p_entry['filename'];
                                else if (!strstr($p_entry['filename'], "/"))
                                $v_dir_to_check = "";
                                else
                                $v_dir_to_check = dirname($p_entry['filename']);

                                if (($v_result = $this->_dirCheck($v_dir_to_check, (($p_entry['external']&0x00000010)==0x00000010))) != 1) {
                                        // Change the file status
                                        $p_entry['status'] = "path_creation_fail";

                                        // Return
                                        //return $v_result;
                                        $v_result = 1;
                                }
                        }
                }

                // Look if extraction should be done
                if ($p_entry['status'] == 'ok') {
                        // Do the extraction (if not a folder)
                        if (!(($p_entry['external']&0x00000010)==0x00000010)) {
                                // Look for not compressed file
                                if ($p_entry['compressed_size'] == $p_entry['size']) {
                                        // Opening destination file
                                        if (($v_dest_file = @fopen($p_entry['filename'], 'wb')) == 0) {
                                                // Change the file status
                                                $p_entry['status'] = "write_error";

                                                // Return
                                                return $v_result;
                                        }


                                        // Read the file by ARCHIVE_ZIP_READ_BLOCK_SIZE octets blocks
                                        $v_size = $p_entry['compressed_size'];
                                        while ($v_size != 0) {
                                                $v_read_size = ($v_size < ARCHIVE_ZIP_READ_BLOCK_SIZE ? $v_size : ARCHIVE_ZIP_READ_BLOCK_SIZE);
                                                $v_buffer = fread($this->_zip_fd, $v_read_size);
                                                $v_binary_data = pack('a'.$v_read_size, $v_buffer);
                                                @fwrite($v_dest_file, $v_binary_data, $v_read_size);
                                                $v_size -= $v_read_size;
                                        }

                                        // Closing the destination file
                                        fclose($v_dest_file);

                                        // Change the file mtime
                                        touch($p_entry['filename'], $p_entry['mtime']);
                                } else {
                                        // Trace

                                        // Opening destination file
                                        if (($v_dest_file = @fopen($p_entry['filename'], 'wb')) == 0) {

                                                // Change the file status
                                                $p_entry['status'] = "write_error";

                                                return $v_result;
                                        }


                                        // Read the compressed file in a buffer (one shot)
                                        $v_buffer = @fread($this->_zip_fd, $p_entry['compressed_size']);

                                        // Decompress the file
                                        $v_file_content = gzinflate($v_buffer);
                                        unset($v_buffer);

                                        // Write the uncompressed data
                                        @fwrite($v_dest_file, $v_file_content, $p_entry['size']);
                                        unset($v_file_content);

                                        // Closing the destination file
                                        @fclose($v_dest_file);

                                        // Change the file mtime
                                        @touch($p_entry['filename'], $p_entry['mtime']);
                                }

                                // Look for chmod option
                                if (   (isset($p_params[ARCHIVE_ZIP_PARAM_SET_CHMOD]))
                                && ($p_params[ARCHIVE_ZIP_PARAM_SET_CHMOD] != 0)) {

                                        // Change the mode of the file
                                        chmod($p_entry['filename'], $p_params[ARCHIVE_ZIP_PARAM_SET_CHMOD]);
                                }

                        }
                }

                // Look for post-extract callback
                if (   (isset($p_params[ARCHIVE_ZIP_PARAM_POST_EXTRACT]))
                && ($p_params[ARCHIVE_ZIP_PARAM_POST_EXTRACT] != '')) {

                        // Generate a local information
                        $v_local_header = array();
                        $this->_convertHeader2FileInfo($p_entry, $v_local_header);

                        // Call the callback
                        // Here I do not use call_user_func() because I need to send a reference to the
                        // header.
                        eval('$v_result = '.$p_params[ARCHIVE_ZIP_PARAM_POST_EXTRACT].'(ARCHIVE_ZIP_PARAM_POST_EXTRACT, $v_local_header);');
                }

                // Return
                return $v_result;
        }

        function _readFileHeader(&$p_header) {
                $v_result=1;

                // Read the 4 bytes signature
                $v_binary_data = @fread($this->_zip_fd, 4);
                $v_data = unpack('Vid', $v_binary_data);

                // Check signature
                if ($v_data['id'] != 0x04034b50) {

                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT, 'Invalid archive structure');

                        // Return
                        return em_unzip::errorCode();
                }

                // Read the first 42 bytes of the header
                $v_binary_data = fread($this->_zip_fd, 26);

                // Look for invalid block size
                if (strlen($v_binary_data) != 26) {
                        $p_header['filename'] = "";
                        $p_header['status'] = "invalid_header";

                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT, "Invalid block size : ".strlen($v_binary_data));

                        // Return
                        return em_unzip::errorCode();
                }

                // Extract the values
                $v_data = unpack('vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $v_binary_data);

                // Get filename
                $p_header['filename'] = fread($this->_zip_fd, $v_data['filename_len']);

                // Get extra_fields
                if ($v_data['extra_len'] != 0) {
                        $p_header['extra'] = fread($this->_zip_fd, $v_data['extra_len']);
                }
                else {
                        $p_header['extra'] = '';
                }

                // Extract properties
                $p_header['compression'] = $v_data['compression'];
                $p_header['size'] = $v_data['size'];
                $p_header['compressed_size'] = $v_data['compressed_size'];
                $p_header['crc'] = $v_data['crc'];
                $p_header['flag'] = $v_data['flag'];

                // Recuperate date in UNIX format
                $p_header['mdate'] = $v_data['mdate'];
                $p_header['mtime'] = $v_data['mtime'];
                if ($p_header['mdate'] && $p_header['mtime']) {
                        // Extract time
                        $v_hour = ($p_header['mtime'] & 0xF800) >> 11;
                        $v_minute = ($p_header['mtime'] & 0x07E0) >> 5;
                        $v_seconde = ($p_header['mtime'] & 0x001F)*2;

                        // Extract date
                        $v_year = (($p_header['mdate'] & 0xFE00) >> 9) + 1980;
                        $v_month = ($p_header['mdate'] & 0x01E0) >> 5;
                        $v_day = $p_header['mdate'] & 0x001F;

                        // Get UNIX date format
                        $p_header['mtime'] = mktime($v_hour, $v_minute, $v_seconde, $v_month, $v_day, $v_year);

                } else {
                        $p_header['mtime'] = time();
                }

                // Other informations

                // TBC
                //for(reset($v_data); $key = key($v_data); next($v_data)) {
                //}

                // Set the stored filename
                $p_header['stored_filename'] = $p_header['filename'];

                // Set the status field
                $p_header['status'] = "ok";

                // Return
                return $v_result;
        }

        function _readCentralFileHeader(&$p_header) {
                $v_result=1;

                // Read the 4 bytes signature
                $v_binary_data = @fread($this->_zip_fd, 4);
                $v_data = unpack('Vid', $v_binary_data);

                // Check signature
                if ($v_data['id'] != 0x02014b50) {

                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT, 'Invalid archive structure');

                        // Return
                        return em_unzip::errorCode();
                }

                // Read the first 42 bytes of the header
                $v_binary_data = fread($this->_zip_fd, 42);

                // Look for invalid block size
                if (strlen($v_binary_data) != 42) {
                        $p_header['filename'] = "";
                        $p_header['status'] = "invalid_header";

                        // Error log
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT, "Invalid block size : ".strlen($v_binary_data));

                        // Return
                        return em_unzip::errorCode();
                }

                // Extract the values
                $p_header = unpack('vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $v_binary_data);

                // Get filename
                if ($p_header['filename_len'] != 0)
                $p_header['filename'] = fread($this->_zip_fd, $p_header['filename_len']);
                else
                $p_header['filename'] = '';

                // Get extra
                if ($p_header['extra_len'] != 0)
                $p_header['extra'] = fread($this->_zip_fd, $p_header['extra_len']);
                else
                $p_header['extra'] = '';

                // Get comment
                if ($p_header['comment_len'] != 0)
                $p_header['comment'] = fread($this->_zip_fd, $p_header['comment_len']);
                else
                $p_header['comment'] = '';

                // Extract properties

                // Recuperate date in UNIX format
                if ($p_header['mdate'] && $p_header['mtime']) {
                        // Extract time
                        $v_hour = ($p_header['mtime'] & 0xF800) >> 11;
                        $v_minute = ($p_header['mtime'] & 0x07E0) >> 5;
                        $v_seconde = ($p_header['mtime'] & 0x001F)*2;

                        // Extract date
                        $v_year = (($p_header['mdate'] & 0xFE00) >> 9) + 1980;
                        $v_month = ($p_header['mdate'] & 0x01E0) >> 5;
                        $v_day = $p_header['mdate'] & 0x001F;

                        // Get UNIX date format
                        $p_header['mtime'] = mktime($v_hour, $v_minute, $v_seconde, $v_month, $v_day, $v_year);

                } else {
                        $p_header['mtime'] = time();
                }

                // Set the stored filename
                $p_header['stored_filename'] = $p_header['filename'];

                // Set default status to ok
                $p_header['status'] = 'ok';

                // Look if it is a directory
                if (substr($p_header['filename'], -1) == '/') {
                        $p_header['external'] = 0x41FF0010;
                }


                // Return
                return $v_result;
        }

        function _readEndCentralDir(&$p_central_dir) {
                $v_result=1;

                // Go to the end of the zip file
                $v_size = filesize($this->_zipname);
                @fseek($this->_zip_fd, $v_size);
                if (@ftell($this->_zip_fd) != $v_size) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                        'Unable to go to the end of the archive \''
                        .$this->_zipname.'\'');
                        return em_unzip::errorCode();
                }

                // First try : look if this is an archive with no commentaries
                // (most of the time)
                // in this case the end of central dir is at 22 bytes of the file end
                $v_found = 0;
                if ($v_size > 26) {
                        @fseek($this->_zip_fd, $v_size-22);
                        if (($v_pos = @ftell($this->_zip_fd)) != ($v_size-22)) {
                                $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                                'Unable to seek back to the middle of the archive \''
                                .$this->_zipname.'\'');
                                return em_unzip::errorCode();
                        }

                        // Read for bytes
                        $v_binary_data = @fread($this->_zip_fd, 4);
                        $v_data = unpack('Vid', $v_binary_data);

                        // Check signature
                        if ($v_data['id'] == 0x06054b50) {
                                $v_found = 1;
                        }

                        $v_pos = ftell($this->_zip_fd);
                }

                // Go back to the maximum possible size of the Central Dir End Record
                if (!$v_found) {
                        $v_maximum_size = 65557; // 0xFFFF + 22;
                        if ($v_maximum_size > $v_size)
                        $v_maximum_size = $v_size;
                        @fseek($this->_zip_fd, $v_size-$v_maximum_size);
                        if (@ftell($this->_zip_fd) != ($v_size-$v_maximum_size)) {
                                $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                                'Unable to seek back to the middle of the archive \''
                                .$this->_zipname.'\'');
                                return em_unzip::errorCode();
                        }

                        // Read byte per byte in order to find the signature
                        $v_pos = ftell($this->_zip_fd);
                        $v_bytes = 0x00000000;
                        while ($v_pos < $v_size) {
                                // Read a byte
                                $v_byte = @fread($this->_zip_fd, 1);

                                //  Add the byte
                                $v_bytes = ($v_bytes << 8) | Ord($v_byte);

                                // Compare the bytes
                                if ($v_bytes == 0x504b0506) {
                                        $v_pos++;
                                        break;
                                }

                                $v_pos++;
                        }

                        // Look if not found end of central dir
                        if ($v_pos == $v_size) {
                                $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                                "Unable to find End of Central Dir Record signature");
                                return em_unzip::errorCode();
                        }
                }

                // Read the first 18 bytes of the header
                $v_binary_data = fread($this->_zip_fd, 18);

                // Look for invalid block size
                if (strlen($v_binary_data) != 18) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                        "Invalid End of Central Dir Record size : "
                        .strlen($v_binary_data));
                        return em_unzip::errorCode();
                }

                // Extract the values
                $v_data = unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', $v_binary_data);

                // Check the global size
                if (($v_pos + $v_data['comment_size'] + 18) != $v_size) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_BAD_FORMAT,
                        "Fail to find the right signature");
                        return em_unzip::errorCode();
                }

                // Get comment
                if ($v_data['comment_size'] != 0)
                $p_central_dir['comment'] = fread($this->_zip_fd, $v_data['comment_size']);
                else
                $p_central_dir['comment'] = '';

                $p_central_dir['entries'] = $v_data['entries'];
                $p_central_dir['disk_entries'] = $v_data['disk_entries'];
                $p_central_dir['offset'] = $v_data['offset'];
                $p_central_dir['size'] = $v_data['size'];
                $p_central_dir['disk'] = $v_data['disk'];
                $p_central_dir['disk_start'] = $v_data['disk_start'];

                // Return
                return $v_result;
        }

        function _dirCheck($p_dir, $p_is_dir=false) {
                $v_result = 1;

                // Remove the final '/'
                if (($p_is_dir) && (substr($p_dir, -1)=='/')) {
                        $p_dir = substr($p_dir, 0, strlen($p_dir)-1);
                }

                // Check the directory availability
                if ((is_dir($p_dir)) || ($p_dir == "")) {
                        return 1;
                }

                // Extract parent directory
                $p_parent_dir = dirname($p_dir);

                // Just a check
                if ($p_parent_dir != $p_dir) {
                        // Look for parent directory
                        if ($p_parent_dir != "") {
                                if (($v_result = $this->_dirCheck($p_parent_dir)) != 1) {
                                        return $v_result;
                                }
                        }
                }

                // Create the directory
                if (!@mkdir($p_dir, 0777)) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_DIR_CREATE_FAIL,
                        "Unable to create directory '$p_dir'");
                        return em_unzip::errorCode();
                }

                // Return
                return $v_result;
        }

        function _check_parameters(&$p_params, $p_default) {

                // Check that param is an array
                if (!is_array($p_params)) {
                        $this->_errorLog(ARCHIVE_ZIP_ERR_INVALID_PARAMETER,
                        'Unsupported parameter, waiting for an array');
                        return em_unzip::errorCode();
                }

                // Check that all the params are valid
                for (reset($p_params); list($v_key, $v_value) = each($p_params); ) {
                        if (!isset($p_default[$v_key])) {
                                $this->_errorLog(ARCHIVE_ZIP_ERR_INVALID_PARAMETER,
                                'Unsupported parameter with key \''.$v_key.'\'');

                                return em_unzip::errorCode();
                        }
                }

                // Set the default values
                for (reset($p_default); list($v_key, $v_value) = each($p_default); ) {
                        if (!isset($p_params[$v_key])) {
                                $p_params[$v_key] = $p_default[$v_key];
                        }
                }

                // Check specific parameters
                $v_callback_list = array ('callback_pre_add','callback_post_add',
                'callback_pre_extract','callback_post_extract');
                for ($i=0; $i<sizeof($v_callback_list); $i++) {
                        $v_key=$v_callback_list[$i];
                        if (   (isset($p_params[$v_key])) && ($p_params[$v_key] != '')) {
                                if (!function_exists($p_params[$v_key])) {
                                        $this->_errorLog(ARCHIVE_ZIP_ERR_INVALID_PARAM_VALUE,
                                        "Callback '".$p_params[$v_key]
                                        ."()' is not an existing function for "
                                        ."parameter '".$v_key."'");
                                        return em_unzip::errorCode();
                                }
                        }
                }

                return(1);
        }

        function _errorLog($p_error_code=0, $p_error_string='') {
                $this->_error_code = $p_error_code;
                $this->_error_string = $p_error_string;
        }

        function _errorReset() {
                $this->_error_code = 1;
                $this->_error_string = '';
        }

        function _tool_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:"");
                                }
                        }
                }

                // Return
                return $v_result;
        }

        function _tool_PathInclusion($p_dir, $p_path) {
                $v_result = 1;

                // Explode dir and path by directory separator
                $v_list_dir = explode("/", $p_dir);
                $v_list_dir_size = sizeof($v_list_dir);
                $v_list_path = explode("/", $p_path);
                $v_list_path_size = sizeof($v_list_path);

                // Study directories paths
                $i = 0;
                $j = 0;
                while (($i < $v_list_dir_size) && ($j < $v_list_path_size) && ($v_result)) {
                        // Look for empty dir (path reduction)
                        if ($v_list_dir[$i] == '') {
                                $i++;
                                continue;
                        }
                        if ($v_list_path[$j] == '') {
                                $j++;
                                continue;
                        }

                        // Compare the items
                        if (   ($v_list_dir[$i] != $v_list_path[$j]) && ($v_list_dir[$i] != '') && ( $v_list_path[$j] != ''))  {
                                $v_result = 0;
                        }

                        // Next items
                        $i++;
                        $j++;
                }

                // Look if everything seems to be the same
                if ($v_result) {
                        // Skip all the empty items
                        while (($j < $v_list_path_size) && ($v_list_path[$j] == '')) $j++;
                        while (($i < $v_list_dir_size) && ($v_list_dir[$i] == '')) $i++;

                        if (($i >= $v_list_dir_size) && ($j >= $v_list_path_size)) {
                                // There are exactly the same
                                $v_result = 2;
                        } else if ($i < $v_list_dir_size) {
                                // The path is shorter than the dir
                                $v_result = 0;
                        }
                }

                // Return
                return $v_result;
        }

        function _tool_CopyBlock($p_src, $p_dest, $p_size, $p_mode=0) {
                $v_result = 1;

                if ($p_mode==0) {
                        while ($p_size != 0) {
                                $v_read_size = ($p_size < ARCHIVE_ZIP_READ_BLOCK_SIZE
                                ? $p_size : ARCHIVE_ZIP_READ_BLOCK_SIZE);
                                $v_buffer = @fread($p_src, $v_read_size);
                                @fwrite($p_dest, $v_buffer, $v_read_size);
                                $p_size -= $v_read_size;
                        }
                } else if ($p_mode==1) {
                        while ($p_size != 0) {
                                $v_read_size = ($p_size < ARCHIVE_ZIP_READ_BLOCK_SIZE
                                ? $p_size : ARCHIVE_ZIP_READ_BLOCK_SIZE);
                                $v_buffer = @gzread($p_src, $v_read_size);
                                @fwrite($p_dest, $v_buffer, $v_read_size);
                                $p_size -= $v_read_size;
                        }
                } else if ($p_mode==2) {
                        while ($p_size != 0) {
                                $v_read_size = ($p_size < ARCHIVE_ZIP_READ_BLOCK_SIZE
                                ? $p_size : ARCHIVE_ZIP_READ_BLOCK_SIZE);
                                $v_buffer = @fread($p_src, $v_read_size);
                                @gzwrite($p_dest, $v_buffer, $v_read_size);
                                $p_size -= $v_read_size;
                        }
                }
                else if ($p_mode==3) {
                        while ($p_size != 0) {
                                $v_read_size = ($p_size < ARCHIVE_ZIP_READ_BLOCK_SIZE
                                ? $p_size : ARCHIVE_ZIP_READ_BLOCK_SIZE);
                                $v_buffer = @gzread($p_src, $v_read_size);
                                @gzwrite($p_dest, $v_buffer, $v_read_size);
                                $p_size -= $v_read_size;
                        }
                }

                // Return
                return $v_result;
        }

        function _tool_Rename($p_src, $p_dest) {
                $v_result = 1;

                // Try to rename the files
                if (!@rename($p_src, $p_dest)) {

                        // Try to copy & unlink the src
                        if (!@copy($p_src, $p_dest)) {
                                $v_result = 0;
                        } else if (!@unlink($p_src)) {
                                $v_result = 0;
                        }
                }

                // Return
                return $v_result;
        }

        function _tool_TranslateWinPath($p_path, $p_remove_disk_letter=true) {
                if (stristr(php_uname(), 'windows')) {
                        // Look for potential disk letter
                        if (   ($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;
        }

}

?>