基于PHP的压缩文件类源码.zip

<?php /* File name: /include/zip.php Author: Horace 2009/04/15 */ class PHPZip{ var $dirInfo = array("0","0"); var $rootDir = ''; var $datasec = array(); var $ctrl_dir = array(); var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; var $old_offset = 0; function downloadZip(){ createZip($dir, $zipfilename, true); } function createZip($dir, $zipfilename, $autoDownload = false){ if (@function_exists('gzcompress')){ @set_time_limit("0"); if (is_array($dir)){ $fd = fopen ($dir, "r"); $fileValue = fread ($fd, filesize ($filename)); fclose ($fd); if (is_array($dir)) $filename = basename($dir); $this -> addFile($fileValue, "$filename"); }else{ $this->dirTree($dir,$dir); } $zipfilenametemp = time().$zipfilename; $out = $this -> filezip(); $fp = fopen($zipfilenametemp, "w"); fwrite($fp, $out, strlen($out)); fclose($fp); $filesize = filesize($zipfilenametemp); if ($filesize < 104857600) { if($autoDownload){ header("Content-type: application/octet-stream"); header("Content-disposition: attachment; filename=".$zipfilename); } echo $this -> filezip(); }else{ echo "create zip error!"; } unlink($zipfilenametemp); } } //get dir tree.. function dirTree($directory,$rootDir){ global $_SERVER,$dirInfo,$rootDir; $fileDir=$rootDir; $myDir=dir($directory); while($file=$myDir->read()){ if(is_dir("$directory/$file") and $file!="." and $file!=".."){ $dirInfo[0]++; $rootDir ="$fileDir$file/"; $this -> addFile('', "$rootDir"); //go on n's folders $this->dirTree("$directory/$file",$rootDir); }else{ if($file!="." and $file!=".."){ $dirInfo[1]++; //$fd = fopen ("$directory/$file", "r"); $fileValue = file_get_contents("$directory/$file"); //fclose ($fd); $this -> addFile($fileValue, "$fileDir$file"); } } } $myDir->close(); } function unix2DosTime($unixtime = 0) { $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime); if ($timearray['year'] < 1980) { $timearray['year'] = 1980; $timearray['mon'] = 1; $timearray['mday'] = 1; $timearray['hours'] = 0; $timearray['minutes'] = 0; $timearray['seconds'] = 0; } // end if return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1); } function addFile($data, $name, $time = 0){ $name = str_replace('\\', '/', $name); $dtime = dechex($this->unix2DosTime($time)); $hexdtime = '\x' . $dtime[6] . $dtime[7] . '\x' . $dtime[4] . $dtime[5] . '\x' . $dtime[2] . $dtime[3] . '\x' . $dtime[0] . $dtime[1]; eval('$hexdtime = "' . $hexdtime . '";'); $fr = "\x50\x4b\x03\x04"; $fr .= "\x14\x00"; // ver needed to extract $fr .= "\x00\x00"; // gen purpose bit flag $fr .= "\x08\x00"; // compression method $fr .= $hexdtime; // last mod time and date // "local file header" segment $unc_len = strlen($data); $crc = crc32($data); $zdata = gzcompress($data); $c_len = strlen($zdata); $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize $fr .= pack('v', strlen($name)); // length of filename $fr .= pack('v', 0); // extra field length $fr .= $name; // "file data" segment $fr .= $zdata; // "data descriptor" segment (optional but necessary if archive is not // served as file) $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize // add this entry to array $this -> datasec[] = $fr; $new_offset = strlen(implode('', $this->datasec)); // now add to central directory record $cdrec = "\x50\x4b\x01\x02"; $cdrec .= "\x00\x00"; // version made by $cdrec .= "\x14\x00"; // version needed to extract $cdrec .= "\x00\x00"; // gen purpose bit flag $cdrec .= "\x08\x00"; // compression method $cdrec .= $hexdtime; // last mod time & date $cdrec .= pack('V', $crc); // crc32 $cdrec .= pack('V', $c_len); // compressed filesize $cdrec .= pack('V', $unc_len); // uncompressed filesize $cdrec .= pack('v', strlen($name) ); // length of filename $cdrec .= pack('v', 0 ); // extra field length $cdrec .= pack('v', 0 ); // file comment length $cdrec .= pack('v', 0 ); // disk number start $cdrec .= pack('v', 0 ); // internal file attributes $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header $this -> old_offset = $new_offset; $cdrec .= $name; // optional extra field, file comment goes here // save to central directory $this -> ctrl_dir[] = $cdrec; } function filezip(){ $data = implode('', $this -> datasec); $ctrldir = implode('', $this -> ctrl_dir); return $data . $ctrldir . $this -> eof_ctrl_dir . pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk" pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall pack('V', strlen($ctrldir)) . // size of central dir pack('V', strlen($data)) . // offset to start of central dir "\x00\x00"; // .zip file comment length } } ?>