<?php
    /*
    TbsZip version 2.15
    Date    : 2013-10-16
    Author  : Skrol29 (email: http://www.tinybutstrong.com/onlyyou.html)
    Licence : LGPL
    This class is independent from any other classes and has been originally created for the OpenTbs plug-in
    for TinyButStrong Template Engine (TBS). OpenTbs makes TBS able to merge OpenOffice and Ms Office documents.
    Visit http://www.tinybutstrong.com
    */
    namespace DocxMerge\libraries;

    define('TBSZIP_DOWNLOAD',1);   // download (default)
    define('TBSZIP_NOHEADER',4);   // option to use with DOWNLOAD: no header is sent
    define('TBSZIP_FILE',8);       // output to file  , or add from file
    define('TBSZIP_STRING',32);    // output to string, or add from string

    class TbsZip {

        function __construct() {
            $this->Meth8Ok = extension_loaded('zlib'); // check if Zlib extension is available. This is need for compress and uncompress with method 8.
            $this->DisplayError = true;
            $this->ArchFile = '';
            $this->Error = false;
        }

        function CreateNew($ArchName='new.zip') {
            // Create a new virtual empty archive, the name will be the default name when the archive is flushed.
            if (!isset($this->Meth8Ok)) $this->__construct();  // for PHP 4 compatibility
            $this->Close(); // note that $this->ArchHnd is set to false here
            $this->Error = false;
            $this->ArchFile = $ArchName;
            $this->ArchIsNew = true;
            $bin = 'PK'.chr(05).chr(06).str_repeat(chr(0), 18);
            $this->CdEndPos = strlen($bin) - 4;
            $this->CdInfo = array('disk_num_curr'=>0, 'disk_num_cd'=>0, 'file_nbr_curr'=>0, 'file_nbr_tot'=>0, 'l_cd'=>0, 'p_cd'=>0, 'l_comm'=>0, 'v_comm'=>'', 'bin'=>$bin);
            $this->CdPos = $this->CdInfo['p_cd'];
        }

        function Open($ArchFile, $UseIncludePath=false) {
            // Open the zip archive
            if (!isset($this->Meth8Ok)) $this->__construct();  // for PHP 4 compatibility
            $this->Close(); // close handle and init info
            $this->Error = false;
            $this->ArchIsNew = false;
            $this->ArchIsStream = (is_resource($ArchFile) && (get_resource_type($ArchFile)=='stream'));
            if ($this->ArchIsStream) {
                $this->ArchFile = 'from_stream.zip';
                $this->ArchHnd = $ArchFile;
            } else {
                // open the file
                $this->ArchFile = $ArchFile;
                $this->ArchHnd = fopen($ArchFile, 'rb', $UseIncludePath);
            }
            $ok = !($this->ArchHnd===false);
            if ($ok) $ok = $this->CentralDirRead();
            return $ok;
        }

        function Close() {
            if (isset($this->ArchHnd) and ($this->ArchHnd!==false)) fclose($this->ArchHnd);
            $this->ArchFile = '';
            $this->ArchHnd = false;
            $this->CdInfo = array();
            $this->CdFileLst = array();
            $this->CdFileNbr = 0;
            $this->CdFileByName = array();
            $this->VisFileLst = array();
            $this->ArchCancelModif();
        }

        function ArchCancelModif() {
            $this->LastReadComp = false; // compression of the last read file (1=compressed, 0=stored not compressed, -1= stored compressed but read uncompressed)
            $this->LastReadIdx = false;  // index of the last file read
            $this->ReplInfo = array();
            $this->ReplByPos = array();
            $this->AddInfo = array();
        }

        function FileAdd($Name, $Data, $DataType=TBSZIP_STRING, $Compress=true) {

            if ($Data===false) return $this->FileCancelModif($Name, false); // Cancel a previously added file

            // Save information for adding a new file into the archive
            $Diff = 30 + 46 + 2*strlen($Name); // size of the header + cd info
            $Ref = $this->_DataCreateNewRef($Data, $DataType, $Compress, $Diff, $Name);
            if ($Ref===false) return false;
            $Ref['name'] = $Name;
            $this->AddInfo[] = $Ref;
            return $Ref['res'];

        }

        function CentralDirRead() {
            $cd_info = 'PK'.chr(05).chr(06); // signature of the Central Directory
            $cd_pos = -22;
            $this->_MoveTo($cd_pos, SEEK_END);
            $b = $this->_ReadData(4);
            if ($b===$cd_info) {
                $this->CdEndPos = ftell($this->ArchHnd) - 4;
            } else {
                $p = $this->_FindCDEnd($cd_info);
                //echo 'p='.var_export($p,true); exit;
                if ($p===false) {
                    return $this->RaiseError('The End of Central Directory Record is not found.');
                } else {
                    $this->CdEndPos = $p;
                    $this->_MoveTo($p+4);
                }
            }
            $this->CdInfo = $this->CentralDirRead_End($cd_info);
            $this->CdFileLst = array();
            $this->CdFileNbr = $this->CdInfo['file_nbr_curr'];
            $this->CdPos = $this->CdInfo['p_cd'];

            if ($this->CdFileNbr<=0) return $this->RaiseError('No header found in the Central Directory.');
            if ($this->CdPos<=0) return $this->RaiseError('No position found for the Central Directory.');

            $this->_MoveTo($this->CdPos);
            for ($i=0;$i<$this->CdFileNbr;$i++) {
                $x = $this->CentralDirRead_File($i);
                if ($x!==false) {
                    $this->CdFileLst[$i] = $x;
                    $this->CdFileByName[$x['v_name']] = $i;
                }
            }
            return true;
        }

        function CentralDirRead_End($cd_info) {
            $b = $cd_info.$this->_ReadData(18);
            $x = array();
            $x['disk_num_curr'] = $this->_GetDec($b,4,2);  // number of this disk
            $x['disk_num_cd'] = $this->_GetDec($b,6,2);    // number of the disk with the start of the central directory
            $x['file_nbr_curr'] = $this->_GetDec($b,8,2);  // total number of entries in the central directory on this disk
            $x['file_nbr_tot'] = $this->_GetDec($b,10,2);  // total number of entries in the central directory
            $x['l_cd'] = $this->_GetDec($b,12,4);          // size of the central directory
            $x['p_cd'] = $this->_GetDec($b,16,4);          // position of start of central directory with respect to the starting disk number
            $x['l_comm'] = $this->_GetDec($b,20,2);        // .ZIP file comment length
            $x['v_comm'] = $this->_ReadData($x['l_comm']); // .ZIP file comment
            $x['bin'] = $b.$x['v_comm'];
            return $x;
        }

        function CentralDirRead_File($idx) {

            $b = $this->_ReadData(46);

            $x = $this->_GetHex($b,0,4);
            if ($x!=='h:02014b50') return $this->RaiseError("Signature of Central Directory Header #".$idx." (file information) expected but not found at position ".$this->_TxtPos(ftell($this->ArchHnd) - 46).".");

            $x = array();
            $x['vers_used'] = $this->_GetDec($b,4,2);
            $x['vers_necess'] = $this->_GetDec($b,6,2);
            $x['purp'] = $this->_GetBin($b,8,2);
            $x['meth'] = $this->_GetDec($b,10,2);
            $x['time'] = $this->_GetDec($b,12,2);
            $x['date'] = $this->_GetDec($b,14,2);
            $x['crc32'] = $this->_GetDec($b,16,4);
            $x['l_data_c'] = $this->_GetDec($b,20,4);
            $x['l_data_u'] = $this->_GetDec($b,24,4);
            $x['l_name'] = $this->_GetDec($b,28,2);
            $x['l_fields'] = $this->_GetDec($b,30,2);
            $x['l_comm'] = $this->_GetDec($b,32,2);
            $x['disk_num'] = $this->_GetDec($b,34,2);
            $x['int_file_att'] = $this->_GetDec($b,36,2);
            $x['ext_file_att'] = $this->_GetDec($b,38,4);
            $x['p_loc'] = $this->_GetDec($b,42,4);
            $x['v_name'] = $this->_ReadData($x['l_name']);
            $x['v_fields'] = $this->_ReadData($x['l_fields']);
            $x['v_comm'] = $this->_ReadData($x['l_comm']);

            $x['bin'] = $b.$x['v_name'].$x['v_fields'].$x['v_comm'];

            return $x;
        }

        function RaiseError($Msg) {
            if ($this->DisplayError) {
                if (PHP_SAPI==='cli') {
                    echo get_class($this).' ERROR with the zip archive: '.$Msg."\r\n";
                } else {
                    echo '<strong>'.get_class($this).' ERROR with the zip archive:</strong> '.$Msg.'<br>'."\r\n";
                }
            }
            $this->Error = $Msg;
            return false;
        }

        function Debug($FileHeaders=false) {

            $this->DisplayError = true;

            if ($FileHeaders) {
                // Calculations first in order to have error messages before other information
                $idx = 0;
                $pos = 0;
                $pos_stop = $this->CdInfo['p_cd'];
                $this->_MoveTo($pos);
                while ( ($pos<$pos_stop) && ($ok = $this->_ReadFile($idx,false)) ) {
                    $this->VisFileLst[$idx]['p_this_header (debug_mode only)'] = $pos;
                    $pos = ftell($this->ArchHnd);
                    $idx++;
                }
            }

            $nl = "\r\n";
            echo "<pre>";

            echo "-------------------------------".$nl;
            echo "End of Central Directory record".$nl;
            echo "-------------------------------".$nl;
            print_r($this->DebugArray($this->CdInfo));

            echo $nl;
            echo "-------------------------".$nl;
            echo "Central Directory headers".$nl;
            echo "-------------------------".$nl;
            print_r($this->DebugArray($this->CdFileLst));

            if ($FileHeaders) {
                echo $nl;
                echo "------------------".$nl;
                echo "Local File headers".$nl;
                echo "------------------".$nl;
                print_r($this->DebugArray($this->VisFileLst));
            }

            echo "</pre>";

        }

        function DebugArray($arr) {
            foreach ($arr as $k=>$v) {
                if (is_array($v)) {
                    $arr[$k] = $this->DebugArray($v);
                } elseif (substr($k,0,2)=='p_') {
                    $arr[$k] = $this->_TxtPos($v);
                }
            }
            return $arr;
        }

        function FileExists($NameOrIdx) {
            return ($this->FileGetIdx($NameOrIdx)!==false);
        }

        function FileGetIdx($NameOrIdx) {
            // Check if a file name, or a file index exists in the Central Directory, and return its index
            if (is_string($NameOrIdx)) {
                if (isset($this->CdFileByName[$NameOrIdx])) {
                    return $this->CdFileByName[$NameOrIdx];
                } else {
                    return false;
                }
            } else {
                if (isset($this->CdFileLst[$NameOrIdx])) {
                    return $NameOrIdx;
                } else {
                    return false;
                }
            }
        }

        function FileGetIdxAdd($Name) {
            // Check if a file name exists in the list of file to add, and return its index
            if (!is_string($Name)) return false;
            $idx_lst = array_keys($this->AddInfo);
            foreach ($idx_lst as $idx) {
                if ($this->AddInfo[$idx]['name']===$Name) return $idx;
            }
            return false;
        }

        function FileRead($NameOrIdx, $Uncompress=true) {

            $this->LastReadComp = false; // means the file is not found
            $this->LastReadIdx = false;

            $idx = $this->FileGetIdx($NameOrIdx);
            if ($idx===false) return $this->RaiseError('File "'.$NameOrIdx.'" is not found in the Central Directory.');

            $pos = $this->CdFileLst[$idx]['p_loc'];
            $this->_MoveTo($pos);

            $this->LastReadIdx = $idx; // Can be usefull to get the idx

            $Data = $this->_ReadFile($idx, true);

            // Manage uncompression
            $Comp = 1; // means the contents stays compressed
            $meth = $this->CdFileLst[$idx]['meth'];
            if ($meth==8) {
                if ($Uncompress) {
                    if ($this->Meth8Ok) {
                        $Data = gzinflate($Data);
                        $Comp = -1; // means uncompressed
                    } else {
                        $this->RaiseError('Unable to uncompress file "'.$NameOrIdx.'" because extension Zlib is not installed.');
                    }
                }
            } elseif($meth==0) {
                $Comp = 0; // means stored without compression
            } else {
                if ($Uncompress) $this->RaiseError('Unable to uncompress file "'.$NameOrIdx.'" because it is compressed with method '.$meth.'.');
            }
            $this->LastReadComp = $Comp;

            return $Data;

        }

        function _ReadFile($idx, $ReadData) {
            // read the file header (and maybe the data ) in the archive, assuming the cursor in at a new file position

            $b = $this->_ReadData(30);

            $x = $this->_GetHex($b,0,4);
            if ($x!=='h:04034b50') return $this->RaiseError("Signature of Local File Header #".$idx." (data section) expected but not found at position ".$this->_TxtPos(ftell($this->ArchHnd)-30).".");

            $x = array();
            $x['vers'] = $this->_GetDec($b,4,2);
            $x['purp'] = $this->_GetBin($b,6,2);
            $x['meth'] = $this->_GetDec($b,8,2);
            $x['time'] = $this->_GetDec($b,10,2);
            $x['date'] = $this->_GetDec($b,12,2);
            $x['crc32'] = $this->_GetDec($b,14,4);
            $x['l_data_c'] = $this->_GetDec($b,18,4);
            $x['l_data_u'] = $this->_GetDec($b,22,4);
            $x['l_name'] = $this->_GetDec($b,26,2);
            $x['l_fields'] = $this->_GetDec($b,28,2);
            $x['v_name'] = $this->_ReadData($x['l_name']);
            $x['v_fields'] = $this->_ReadData($x['l_fields']);

            $x['bin'] = $b.$x['v_name'].$x['v_fields'];

            // Read Data
            if (isset($this->CdFileLst[$idx])) {
                $len_cd = $this->CdFileLst[$idx]['l_data_c'];
                if ($x['l_data_c']==0) {
                    // Sometimes, the size is not specified in the local information.
                    $len = $len_cd;
                } else {
                    $len = $x['l_data_c'];
                    if ($len!=$len_cd) {
                        //echo "TbsZip Warning: Local information for file #".$idx." says len=".$len.", while Central Directory says len=".$len_cd.".";
                    }
                }
            } else {
                $len = $x['l_data_c'];
                if ($len==0) $this->RaiseError("File Data #".$idx." cannt be read because no length is specified in the Local File Header and its Central Directory information has not been found.");
            }

            if ($ReadData) {
                $Data = $this->_ReadData($len);
            } else {
                $this->_MoveTo($len, SEEK_CUR);
            }

            // Description information
            $desc_ok = ($x['purp'][2+3]=='1');
            if ($desc_ok) {
                $b = $this->_ReadData(12);
                $s = $this->_GetHex($b,0,4);
                $d = 0;
                // the specification says the signature may or may not be present
                if ($s=='h:08074b50') {
                    $b .= $this->_ReadData(4);
                    $d = 4;
                    $x['desc_bin'] = $b;
                    $x['desc_sign'] = $s;
                } else {
                    $x['desc_bin'] = $b;
                }
                $x['desc_crc32']    = $this->_GetDec($b,0+$d,4);
                $x['desc_l_data_c'] = $this->_GetDec($b,4+$d,4);
                $x['desc_l_data_u'] = $this->_GetDec($b,8+$d,4);
            }

            // Save file info without the data
            $this->VisFileLst[$idx] = $x;

            // Return the info
            if ($ReadData) {
                return $Data;
            } else {
                return true;
            }

        }

        function FileReplace($NameOrIdx, $Data, $DataType=TBSZIP_STRING, $Compress=true) {
            // Store replacement information.

            $idx = $this->FileGetIdx($NameOrIdx);
            if ($idx===false) return $this->RaiseError('File "'.$NameOrIdx.'" is not found in the Central Directory.');

            $pos = $this->CdFileLst[$idx]['p_loc'];

            if ($Data===false) {
                // file to delete
                $this->ReplInfo[$idx] = false;
                $Result = true;
            } else {
                // file to replace
                $Diff = - $this->CdFileLst[$idx]['l_data_c'];
                $Ref = $this->_DataCreateNewRef($Data, $DataType, $Compress, $Diff, $NameOrIdx);
                if ($Ref===false) return false;
                $this->ReplInfo[$idx] = $Ref;
                $Result = $Ref['res'];
            }

            $this->ReplByPos[$pos] = $idx;

            return $Result;

        }

        /**
         * Return the state of the file.
         * @return {string} 'u'=unchanged, 'm'=modified, 'd'=deleted, 'a'=added, false=unknown
         */
        function FileGetState($NameOrIdx) {

            $idx = $this->FileGetIdx($NameOrIdx);
            if ($idx===false) {
                $idx = $this->FileGetIdxAdd($NameOrIdx);
                if ($idx===false) {
                    return false;
                } else {
                    return 'a';
                }
            } elseif (isset($this->ReplInfo[$idx])) {
                if ($this->ReplInfo[$idx]===false) {
                    return 'd';
                } else {
                    return 'm';
                }
            } else {
                return 'u';
            }

        }

        function FileCancelModif($NameOrIdx, $ReplacedAndDeleted=true) {
            // cancel added, modified or deleted modifications on a file in the archive
            // return the number of cancels

            $nbr = 0;

            if ($ReplacedAndDeleted) {
                // replaced or deleted files
                $idx = $this->FileGetIdx($NameOrIdx);
                if ($idx!==false) {
                    if (isset($this->ReplInfo[$idx])) {
                        $pos = $this->CdFileLst[$idx]['p_loc'];
                        unset($this->ReplByPos[$pos]);
                        unset($this->ReplInfo[$idx]);
                        $nbr++;
                    }
                }
            }

            // added files
            $idx = $this->FileGetIdxAdd($NameOrIdx);
            if ($idx!==false) {
                unset($this->AddInfo[$idx]);
                $nbr++;
            }

            return $nbr;

        }

        function Flush($Render=TBSZIP_DOWNLOAD, $File='', $ContentType='') {

            if ( ($File!=='') && ($this->ArchFile===$File)) {
                $this->RaiseError('Method Flush() cannot overwrite the current opened archive: \''.$File.'\''); // this makes corrupted zip archives without PHP error.
                return false;
            }

            $ArchPos = 0;
            $Delta = 0;
            $FicNewPos = array();
            $DelLst = array(); // idx of deleted files
            $DeltaCdLen = 0; // delta of the CD's size

            $now = time();
            $date  = $this->_MsDos_Date($now);
            $time  = $this->_MsDos_Time($now);

            if (!$this->OutputOpen($Render, $File, $ContentType)) return false;

            // output modified zipped files and unmodified zipped files that are beetween them
            ksort($this->ReplByPos);
            foreach ($this->ReplByPos as $ReplPos => $ReplIdx) {
                // output data from the zip archive which is before the data to replace
                $this->OutputFromArch($ArchPos, $ReplPos);
                // get current file information
                if (!isset($this->VisFileLst[$ReplIdx])) $this->_ReadFile($ReplIdx, false);
                $FileInfo =& $this->VisFileLst[$ReplIdx];
                $b1 = $FileInfo['bin'];
                if (isset($FileInfo['desc_bin'])) {
                    $b2 = $FileInfo['desc_bin'];
                } else {
                    $b2 = '';
                }
                $info_old_len = strlen($b1) + $this->CdFileLst[$ReplIdx]['l_data_c'] + strlen($b2); // $FileInfo['l_data_c'] may have a 0 value in some archives
                // get replacement information
                $ReplInfo =& $this->ReplInfo[$ReplIdx];
                if ($ReplInfo===false) {
                    // The file is to be deleted
                    $Delta = $Delta - $info_old_len; // headers and footers are also deleted
                    $DelLst[$ReplIdx] = true;
                } else {
                    // prepare the header of the current file
                    $this->_DataPrepare($ReplInfo); // get data from external file if necessary
                    $this->_PutDec($b1, $time, 10, 2); // time
                    $this->_PutDec($b1, $date, 12, 2); // date
                    $this->_PutDec($b1, $ReplInfo['crc32'], 14, 4); // crc32
                    $this->_PutDec($b1, $ReplInfo['len_c'], 18, 4); // l_data_c
                    $this->_PutDec($b1, $ReplInfo['len_u'], 22, 4); // l_data_u
                    if ($ReplInfo['meth']!==false) $this->_PutDec($b1, $ReplInfo['meth'], 8, 2); // meth
                    // prepare the bottom description if the zipped file, if any
                    if ($b2!=='') {
                        $d = (strlen($b2)==16) ? 4 : 0; // offset because of the signature if any
                        $this->_PutDec($b2, $ReplInfo['crc32'], $d+0, 4); // crc32
                        $this->_PutDec($b2, $ReplInfo['len_c'], $d+4, 4); // l_data_c
                        $this->_PutDec($b2, $ReplInfo['len_u'], $d+8, 4); // l_data_u
                    }
                    // output data
                    $this->OutputFromString($b1.$ReplInfo['data'].$b2);
                    unset($ReplInfo['data']); // save PHP memory
                    $Delta = $Delta + $ReplInfo['diff'] + $ReplInfo['len_c'];
                }
                // Update the delta of positions for zipped files which are physically after the currently replaced one
                for ($i=0;$i<$this->CdFileNbr;$i++) {
                    if ($this->CdFileLst[$i]['p_loc']>$ReplPos) {
                        $FicNewPos[$i] = $this->CdFileLst[$i]['p_loc'] + $Delta;
                    }
                }
                // Update the current pos in the archive
                $ArchPos = $ReplPos + $info_old_len;
            }

            // Ouput all the zipped files that remain before the Central Directory listing
            if ($this->ArchHnd!==false) $this->OutputFromArch($ArchPos, $this->CdPos); // ArchHnd is false if CreateNew() has been called
            $ArchPos = $this->CdPos;

            // Output file to add
            $AddNbr = count($this->AddInfo);
            $AddDataLen = 0; // total len of added data (inlcuding file headers)
            if ($AddNbr>0) {
                $AddPos = $ArchPos + $Delta; // position of the start
                $AddLst = array_keys($this->AddInfo);
                foreach ($AddLst as $idx) {
                    $n = $this->_DataOuputAddedFile($idx, $AddPos);
                    $AddPos += $n;
                    $AddDataLen += $n;
                }
            }

            // Modifiy file information in the Central Directory for replaced files
            $b2 = '';
            $old_cd_len = 0;
            for ($i=0;$i<$this->CdFileNbr;$i++) {
                $b1 = $this->CdFileLst[$i]['bin'];
                $old_cd_len += strlen($b1);
                if (!isset($DelLst[$i])) {
                    if (isset($FicNewPos[$i])) $this->_PutDec($b1, $FicNewPos[$i], 42, 4);   // p_loc
                    if (isset($this->ReplInfo[$i])) {
                        $ReplInfo =& $this->ReplInfo[$i];
                        $this->_PutDec($b1, $time, 12, 2); // time
                        $this->_PutDec($b1, $date, 14, 2); // date
                        $this->_PutDec($b1, $ReplInfo['crc32'], 16, 4); // crc32
                        $this->_PutDec($b1, $ReplInfo['len_c'], 20, 4); // l_data_c
                        $this->_PutDec($b1, $ReplInfo['len_u'], 24, 4); // l_data_u
                        if ($ReplInfo['meth']!==false) $this->_PutDec($b1, $ReplInfo['meth'], 10, 2); // meth
                    }
                    $b2 .= $b1;
                }
            }
            $this->OutputFromString($b2);
            $ArchPos += $old_cd_len;
            $DeltaCdLen =  $DeltaCdLen + strlen($b2) - $old_cd_len;

            // Output until "end of central directory record"
            if ($this->ArchHnd!==false) $this->OutputFromArch($ArchPos, $this->CdEndPos); // ArchHnd is false if CreateNew() has been called

            // Output file information of the Central Directory for added files
            if ($AddNbr>0) {
                $b2 = '';
                foreach ($AddLst as $idx) {
                    $b2 .= $this->AddInfo[$idx]['bin'];
                }
                $this->OutputFromString($b2);
                $DeltaCdLen += strlen($b2);
            }

            // Output "end of central directory record"
            $b2 = $this->CdInfo['bin'];
            $DelNbr = count($DelLst);
            if ( ($AddNbr>0) or ($DelNbr>0) ) {
                // total number of entries in the central directory on this disk
                $n = $this->_GetDec($b2, 8, 2);
                $this->_PutDec($b2, $n + $AddNbr - $DelNbr,  8, 2);
                // total number of entries in the central directory
                $n = $this->_GetDec($b2, 10, 2);
                $this->_PutDec($b2, $n + $AddNbr - $DelNbr, 10, 2);
                // size of the central directory
                $n = $this->_GetDec($b2, 12, 4);
                $this->_PutDec($b2, $n + $DeltaCdLen, 12, 4);
                $Delta = $Delta + $AddDataLen;
            }
            $this->_PutDec($b2, $this->CdPos+$Delta , 16, 4); // p_cd  (offset of start of central directory with respect to the starting disk number)
            $this->OutputFromString($b2);

            $this->OutputClose();

            return true;

        }

        // ----------------
        // output functions
        // ----------------

        function OutputOpen($Render, $File, $ContentType) {

            if (($Render & TBSZIP_FILE)==TBSZIP_FILE) {
                $this->OutputMode = TBSZIP_FILE;
                if (''.$File=='') $File = basename($this->ArchFile).'.zip';
                $this->OutputHandle = @fopen($File, 'w');
                if ($this->OutputHandle===false) {
                    return $this->RaiseError('Method Flush() cannot overwrite the target file \''.$File.'\'. This may not be a valid file path or the file may be locked by another process or because of a denied permission.');
                }
            } elseif (($Render & TBSZIP_STRING)==TBSZIP_STRING) {
                $this->OutputMode = TBSZIP_STRING;
                $this->OutputSrc = '';
            } elseif (($Render & TBSZIP_DOWNLOAD)==TBSZIP_DOWNLOAD) {
                $this->OutputMode = TBSZIP_DOWNLOAD;
                // Output the file
                if (''.$File=='') $File = basename($this->ArchFile);
                if (($Render & TBSZIP_NOHEADER)==TBSZIP_NOHEADER) {
                } else {
                    header ('Pragma: no-cache');
                    if ($ContentType!='') header ('Content-Type: '.$ContentType);
                    header('Content-Disposition: attachment; filename="'.$File.'"');
                    header('Expires: 0');
                    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
                    header('Cache-Control: public');
                    header('Content-Description: File Transfer');
                    header('Content-Transfer-Encoding: binary');
                    $Len = $this->_EstimateNewArchSize();
                    if ($Len!==false) header('Content-Length: '.$Len);
                }
            } else {
                return $this->RaiseError('Method Flush is called with a unsupported render option.');
            }

            return true;

        }

        function OutputFromArch($pos, $pos_stop) {
            $len = $pos_stop - $pos;
            if ($len<0) return;
            $this->_MoveTo($pos);
            $block = 1024;
            while ($len>0) {
                $l = min($len, $block);
                $x = $this->_ReadData($l);
                $this->OutputFromString($x);
                $len = $len - $l;
            }
            unset($x);
        }

        function OutputFromString($data) {
            if ($this->OutputMode===TBSZIP_DOWNLOAD) {
                echo $data; // donwload
            } elseif ($this->OutputMode===TBSZIP_STRING) {
                $this->OutputSrc .= $data; // to string
            } elseif (TBSZIP_FILE) {
                fwrite($this->OutputHandle, $data); // to file
            }
        }

        function OutputClose() {
            if ( ($this->OutputMode===TBSZIP_FILE) && ($this->OutputHandle!==false) ) {
                fclose($this->OutputHandle);
                $this->OutputHandle = false;
            }
        }

        // ----------------
        // Reading functions
        // ----------------

        function _MoveTo($pos, $relative = SEEK_SET) {
            fseek($this->ArchHnd, $pos, $relative);
        }

        function _ReadData($len) {
            if ($len>0) {
                $x = fread($this->ArchHnd, $len);
                return $x;
            } else {
                return '';
            }
        }

        // ----------------
        // Take info from binary data
        // ----------------

        function _GetDec($txt, $pos, $len) {
            $x = substr($txt, $pos, $len);
            $z = 0;
            for ($i=0;$i<$len;$i++) {
                $asc = ord($x[$i]);
                if ($asc>0) $z = $z + $asc*pow(256,$i);
            }
            return $z;
        }

        function _GetHex($txt, $pos, $len) {
            $x = substr($txt, $pos, $len);
            return 'h:'.bin2hex(strrev($x));
        }

        function _GetBin($txt, $pos, $len) {
            $x = substr($txt, $pos, $len);
            $z = '';
            for ($i=0;$i<$len;$i++) {
                $asc = ord($x[$i]);
                if (isset($x[$i])) {
                    for ($j=0;$j<8;$j++) {
                        $z .= ($asc & pow(2,$j)) ? '1' : '0';
                    }
                } else {
                    $z .= '00000000';
                }
            }
            return 'b:'.$z;
        }

        // ----------------
        // Put info into binary data
        // ----------------

        function _PutDec(&$txt, $val, $pos, $len) {
            $x = '';
            for ($i=0;$i<$len;$i++) {
                if ($val==0) {
                    $z = 0;
                } else {
                    $z = intval($val % 256);
                    if (($val<0) && ($z!=0)) { // ($z!=0) is very important, example: val=-420085702
                        // special opration for negative value. If the number id too big, PHP stores it into a signed integer. For example: crc32('coucou') => -256185401 instead of  4038781895. NegVal = BigVal - (MaxVal+1) = BigVal - 256^4
                        $val = ($val - $z)/256 -1;
                        $z = 256 + $z;
                    } else {
                        $val = ($val - $z)/256;
                    }
                }
                $x .= chr($z);
            }
            $txt = substr_replace($txt, $x, $pos, $len);
        }

        function _MsDos_Date($Timestamp = false) {
            // convert a date-time timstamp into the MS-Dos format
            $d = ($Timestamp===false) ? getdate() : getdate($Timestamp);
            return (($d['year']-1980)*512) + ($d['mon']*32) + $d['mday'];
        }
        function _MsDos_Time($Timestamp = false) {
            // convert a date-time timstamp into the MS-Dos format
            $d = ($Timestamp===false) ? getdate() : getdate($Timestamp);
            return ($d['hours']*2048) + ($d['minutes']*32) + intval($d['seconds']/2); // seconds are rounded to an even number in order to save 1 bit
        }

        function _MsDos_Debug($date, $time) {
            // Display the formated date and time. Just for debug purpose.
            // date end time are encoded on 16 bits (2 bytes) : date = yyyyyyymmmmddddd , time = hhhhhnnnnnssssss
            $y = ($date & 65024)/512 + 1980;
            $m = ($date & 480)/32;
            $d = ($date & 31);
            $h = ($time & 63488)/2048;
            $i = ($time & 1984)/32;
            $s = ($time & 31) * 2; // seconds have been rounded to an even number in order to save 1 bit
            return $y.'-'.str_pad($m,2,'0',STR_PAD_LEFT).'-'.str_pad($d,2,'0',STR_PAD_LEFT).' '.str_pad($h,2,'0',STR_PAD_LEFT).':'.str_pad($i,2,'0',STR_PAD_LEFT).':'.str_pad($s,2,'0',STR_PAD_LEFT);
        }

        function _TxtPos($pos) {
            // Return the human readable position in both decimal and hexa
            return $pos." (h:".dechex($pos).")";
        }

        /**
         * Search the record of end of the Central Directory.
         * Return the position of the record in the file.
         * Return false if the record is not found. The comment cannot exceed 65335 bytes (=FFFF).
         * The method is read backwards a block of 256 bytes and search the key in this block.
         */
        function _FindCDEnd($cd_info) {
            $nbr = 1;
            $p = false;
            $pos = ftell($this->ArchHnd) - 4 - 256;
            while ( ($p===false) && ($nbr<256) ) {
                if ($pos<=0) {
                    $pos = 0;
                    $nbr = 256; // in order to make this a last check
                }
                $this->_MoveTo($pos);
                $x = $this->_ReadData(256);
                $p = strpos($x, $cd_info);
                if ($p===false) {
                    $nbr++;
                    $pos = $pos - 256 - 256;
                } else {
                    return $pos + $p;
                }
            }
            return false;
        }

        function _DataOuputAddedFile($Idx, $PosLoc) {

            $Ref =& $this->AddInfo[$Idx];
            $this->_DataPrepare($Ref); // get data from external file if necessary

            // Other info
            $now = time();
            $date  = $this->_MsDos_Date($now);
            $time  = $this->_MsDos_Time($now);
            $len_n = strlen($Ref['name']);
            $purp  = 2048 ; // purpose // +8 to indicates that there is an extended local header

            // Header for file in the data section
            $b = 'PK'.chr(03).chr(04).str_repeat(' ',26); // signature
            $this->_PutDec($b,20,4,2); //vers = 20
            $this->_PutDec($b,$purp,6,2); // purp
            $this->_PutDec($b,$Ref['meth'],8,2);  // meth
            $this->_PutDec($b,$time,10,2); // time
            $this->_PutDec($b,$date,12,2); // date
            $this->_PutDec($b,$Ref['crc32'],14,4); // crc32
            $this->_PutDec($b,$Ref['len_c'],18,4); // l_data_c
            $this->_PutDec($b,$Ref['len_u'],22,4); // l_data_u
            $this->_PutDec($b,$len_n,26,2); // l_name
            $this->_PutDec($b,0,28,2); // l_fields
            $b .= $Ref['name']; // name
            $b .= ''; // fields

            // Output the data
            $this->OutputFromString($b.$Ref['data']);
            $OutputLen = strlen($b) + $Ref['len_c']; // new position of the cursor
            unset($Ref['data']); // save PHP memory

            // Information for file in the Central Directory
            $b = 'PK'.chr(01).chr(02).str_repeat(' ',42); // signature
            $this->_PutDec($b,20,4,2);  // vers_used = 20
            $this->_PutDec($b,20,6,2);  // vers_necess = 20
            $this->_PutDec($b,$purp,8,2);  // purp
            $this->_PutDec($b,$Ref['meth'],10,2); // meth
            $this->_PutDec($b,$time,12,2); // time
            $this->_PutDec($b,$date,14,2); // date
            $this->_PutDec($b,$Ref['crc32'],16,4); // crc32
            $this->_PutDec($b,$Ref['len_c'],20,4); // l_data_c
            $this->_PutDec($b,$Ref['len_u'],24,4); // l_data_u
            $this->_PutDec($b,$len_n,28,2); // l_name
            $this->_PutDec($b,0,30,2); // l_fields
            $this->_PutDec($b,0,32,2); // l_comm
            $this->_PutDec($b,0,34,2); // disk_num
            $this->_PutDec($b,0,36,2); // int_file_att
            $this->_PutDec($b,0,38,4); // ext_file_att
            $this->_PutDec($b,$PosLoc,42,4); // p_loc
            $b .= $Ref['name']; // v_name
            $b .= ''; // v_fields
            $b .= ''; // v_comm

            $Ref['bin'] = $b;

            return $OutputLen;

        }

        function _DataCreateNewRef($Data, $DataType, $Compress, $Diff, $NameOrIdx) {

            if (is_array($Compress)) {
                $result = 2;
                $meth = $Compress['meth'];
                $len_u = $Compress['len_u'];
                $crc32 = $Compress['crc32'];
                $Compress = false;
            } elseif ($Compress and ($this->Meth8Ok)) {
                $result = 1;
                $meth = 8;
                $len_u = false; // means unknown
                $crc32 = false;
            } else {
                $result = ($Compress) ? -1 : 0;
                $meth = 0;
                $len_u = false;
                $crc32 = false;
                $Compress = false;
            }

            if ($DataType==TBSZIP_STRING) {
                $path = false;
                if ($Compress) {
                    // we compress now in order to save PHP memory
                    $len_u = strlen($Data);
                    $crc32 = crc32($Data);
                    $Data = gzdeflate($Data);
                    $len_c = strlen($Data);
                } else {
                    $len_c = strlen($Data);
                    if ($len_u===false) {
                        $len_u = $len_c;
                        $crc32 = crc32($Data);
                    }
                }
            } else {
                $path = $Data;
                $Data = false;
                if (file_exists($path)) {
                    $fz = filesize($path);
                    if ($len_u===false) $len_u = $fz;
                    $len_c = ($Compress) ? false : $fz;
                } else {
                    return $this->RaiseError("Cannot add the file '".$path."' because it is not found.");
                }
            }

            // at this step $Data and $crc32 can be false only in case of external file, and $len_c is false only in case of external file to compress
            return array('data'=>$Data, 'path'=>$path, 'meth'=>$meth, 'len_u'=>$len_u, 'len_c'=>$len_c, 'crc32'=>$crc32, 'diff'=>$Diff, 'res'=>$result);

        }

        function _DataPrepare(&$Ref) {
            // returns the real size of data
            if ($Ref['path']!==false) {
                $Ref['data'] = file_get_contents($Ref['path']);
                if ($Ref['crc32']===false) $Ref['crc32'] = crc32($Ref['data']);
                if ($Ref['len_c']===false) {
                    // means the data must be compressed
                    $Ref['data'] = gzdeflate($Ref['data']);
                    $Ref['len_c'] = strlen($Ref['data']);
                }
            }
        }

        function _EstimateNewArchSize($Optim=true) {
            // Return the size of the new archive, or false if it cannot be calculated (because of external file that must be compressed before to be insered)

            if ($this->ArchIsNew) {
                $Len = strlen($this->CdInfo['bin']);
            } elseif ($this->ArchIsStream) {
                $x = fstat($this->ArchHnd);
                $Len = $x['size'];
            } else {
                $Len = filesize($this->ArchFile);
            }

            // files to replace or delete
            foreach ($this->ReplByPos as $i) {
                $Ref =& $this->ReplInfo[$i];
                if ($Ref===false) {
                    // file to delete
                    $Info =& $this->CdFileLst[$i];
                    if (!isset($this->VisFileLst[$i])) {
                        if ($Optim) return false; // if $Optimization is set to true, then we d'ont rewind to read information
                        $this->_MoveTo($Info['p_loc']);
                        $this->_ReadFile($i, false);
                    }
                    $Vis =& $this->VisFileLst[$i];
                    $Len += -strlen($Vis['bin']) -strlen($Info['bin']) - $Info['l_data_c'];
                    if (isset($Vis['desc_bin'])) $Len += -strlen($Vis['desc_bin']);
                } elseif ($Ref['len_c']===false) {
                    return false; // information not yet known
                } else {
                    // file to replace
                    $Len += $Ref['len_c'] + $Ref['diff'];
                }
            }

            // files to add
            $i_lst = array_keys($this->AddInfo);
            foreach ($i_lst as $i) {
                $Ref =& $this->AddInfo[$i];
                if ($Ref['len_c']===false) {
                    return false; // information not yet known
                } else {
                    $Len += $Ref['len_c'] + $Ref['diff'];
                }
            }

            return $Len;

        }

    }