PHP壓縮zip文件 zip壓縮文件創建類

<?php
/*


Zip file creation class.
Makes zip files.
*
Based on :
*
http://www.zend.com/codex.php?id=535&single=1
By Eric Mueller <eric@themepark.com>
*
http://www.zend.com/codex.php?id=470&single=1
by Denis125 <webmaster@atlant.ru>
*
a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
date and time of the compressed file
*
Official ZIP file format: http://www.pkware.com/company/standards/appnote/appnote.txt
/

class zipfile{

# Array to store compressed data
var $datasec = Array();

# Central directory
var $ctrl_dir = Array();

# End of central directory record
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";

# Last offset position
var $old_offset = 0;

var $print = false;

var $zlib = false;

function zipfile(){
    $this->zlib = extension_loaded("zlib") and function_exists("gzopen");
}

# Converts an Unix timestamp to a four byte DOS date and time format (date
# in high two bytes, time in low two bytes allowing magnitude comparison).
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;
    }

    return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
}

function addTree($dir, $removePath){
    $files = Array();

    $d = dir($dir);

    while($file = $d->read())
        if($file != "." and $file != "..")
            array_push($files, $file);

    if(sizeof($files) == 0){
        $this->addDirectory(str_replace($removePath, "", $dir));
    }else{
        foreach($files as $file){
            if(is_dir($dir . "/" . $file)){
                $this->addTree($dir . "/" . $file, $removePath);
            }else{
                $this->addFile($dir . "/" . $file, str_replace($removePath, "", $dir . "/" . $file), filemtime($dir . "/" . $file));
            }
        }
    }
}

function getFileData($filename){
    $handle = fopen($filename, "rb");

    if(!$handle)
        die("File '$filename' can not be opened !");

    $data = filesize($filename) > 0 ? fread($handle, filesize($filename)) : "";
    fclose($handle);

    return $data;
}

function addDirectory($name){

    $name = str_replace("\\", "/", $name);

    if(!substr($name, -1) != "/")
        $name .= "/";

    $fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";

    $fr .= pack("V",0);
    $fr .= pack("V",0);
    $fr .= pack("V",0);
    $fr .= pack("v", strlen($name));
    $fr .= pack("v", 0);
    $fr .= $name . pack("V", 0);
    $fr .= pack("V", 0);
    $fr .= pack("V", 0);

    $this -> datasec[] = $fr;

    $new_offset = strlen(implode("", $this->datasec));

    $cdrec = "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";
    $cdrec .= pack("V",0);
    $cdrec .= pack("V",0);
    $cdrec .= pack("V",0);
    $cdrec .= pack("v", strlen($name));

    $cdrec .= pack("v", 0);
    $cdrec .= pack("v", 0);
    $cdrec .= pack("v", 0);
    $cdrec .= pack("v", 0);

    $ext = "\xff\xff\xff\xff";
    $cdrec .= pack("V", 16);
    $cdrec .= pack("V", $this->old_offset);
    $cdrec .= $name;

    $this -> ctrl_dir[] = $cdrec;
    $this -> old_offset = $new_offset;
    $this -> dirs[] = $name;
}

# Adds "file" to archive
function addFile($filename, $name, $time = 0){

    $name = str_replace('\\', '/', $name);

    $data = $this->getFileData($filename);
    $dtime = dechex($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);

    $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
    $c_len   = strlen($zdata);
    $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;

    // 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
    $this -> old_offset += strlen($fr);

    $cdrec .= $name;

    // optional extra field, file comment goes here
    // save to central directory
    $this -> ctrl_dir[] = $cdrec;
}

# Dumps out file
function file(){
    $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
}

function writeFile($filename){
    $handle = fopen($filename, "w");
    fwrite($handle, $this->file());
    fclose($handle);
}


function getContentList($filename){
    $handle = fopen($filename, 'rb');

    if(!$handle)
        die("File '$filename' not found!");

    $cd = $this->readCentralDir($handle, $filename);

    rewind($handle);
    fseek($handle, $cd['offset']);

    $list = Array();

    for($i = 0; $i < $cd['entries']; $i ++){

        $header = $this->readCentralFileHeader($handle);
        $header['index'] = $i;

        $info['filename'] = $header['filename'];
        $info['stored_filename'] = $header['stored_filename'];
        $info['size'] = $header['size'];
        $info['compressed_size'] = $header['compressed_size'];
        $info['crc'] = strtoupper(dechex($header['crc']));
        $info['mtime'] = $header['mtime'];
        $info['comment'] = $header['comment'];
        $info['folder'] = ($header['external'] == 0x41FF0010 || $header['external'] == 16) ? 1 : 0;
        $info['index'] = $header['index'];
        $info['status'] = $header['status'];

        array_push($list, $info);

        unset($header);

}
     return $list;
 }

function readFileHeader($handle){
    $binary_data = fread($handle, 30);

    $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);

    $header['filename'] = fread($handle, $data['filename_len']);
    $header['extra'] = $data['extra_len'] != 0 ? fread($handle, $data['extra_len']) : "";
    $header['compression'] = $data['compression'];
    $header['size'] = $data['size'];
    $header['compressed_size'] = $data['compressed_size'];
    $header['crc'] = $data['crc'];
    $header['flag'] = $data['flag'];
    $header['mdate'] = $data['mdate'];
    $header['mtime'] = $data['mtime'];

    if($header['mdate'] && $header['mtime']){
        $hour = ($header['mtime']&0xF800) >> 11;
        $minute = ($header['mtime']&0x07E0) >> 5;
        $seconde = ($header['mtime']&0x001F) * 2;
        $year = (($header['mdate']&0xFE00) >> 9) + 1980;
        $month = ($header['mdate']&0x01E0) >> 5;
        $day = $header['mdate']&0x001F;
        $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
    }else{
        $header['mtime'] = time();
    }

    $header['stored_filename'] = $header['filename'];
    $header['status'] = "ok";
    return $header;
}

function readCentralFileHeader($handle){
    $binary_data = fread($handle, 46);

    $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);

    $header['filename'] = $header['filename_len'] != 0 ? fread($handle,$header['filename_len']) : "";
    $header['extra'] = $header['extra_len'] != 0 ? fread($handle, $header['extra_len']) : "";
    $header['comment'] = $header['comment_len'] != 0 ? fread($handle, $header['comment_len']) : "";

    if($header['mdate'] && $header['mtime']){
        $hour = ($header['mtime']&0xF800) >> 11;
        $minute = ($header['mtime']&0x07E0) >> 5;
        $seconde = ($header['mtime']&0x001F) * 2;
        $year = (($header['mdate']&0xFE00) >> 9) + 1980;
        $month = ($header['mdate']&0x01E0) >> 5;
        $day = $header['mdate']&0x001F;

        $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
    }else{
        $header['mtime'] = time();
    }

    $header['stored_filename'] = $header['filename'];
    $header['status'] = 'ok';

    if(substr($header['filename'], -1) == '/')
        $header['external'] = 0x41FF0010;

    return $header;
}

function readCentralDir($handle, $filename){
    $size = filesize($filename);

    $maximum_size = $size < 277 ? $size : 277;

    fseek($handle, $size - $maximum_size);
    $pos = ftell($handle);
    $bytes = 0x00000000;

    while($pos < $size){
        $byte = fread($handle, 1);
        $bytes = ($bytes << 8) | Ord($byte);

        if($bytes == 0x504b0506){
            $pos++;
            break;
        }
        $pos++;
    }

    $data = unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', fread($handle, 18));

    if($data['comment_size'] != 0)
        $cd['comment'] = fread($handle, $data['comment_size']);
else
        $cd['comment'] = '';

    $cd['entries'] = $data['entries'];
    $cd['disk_entries'] = $data['disk_entries'];
    $cd['offset'] = $data['offset'];
    $cd['disk_start'] = $data['disk_start'];
    $cd['size'] = $data['size'];
    $cd['disk'] = $data['disk'];

    return $cd;
}

function extract($filename, $targetDir, $index = Array()){

    if(!is_dir($targetDir))
        mkdir($targetDir, 0755);

    if(substr($targetDir, -1) != "/")
        $targetDir .= "/";

    $inHandle = fopen($filename, 'rb');

    if(!$inHandle)
        die("File '$filename' not found!");

    $centralDir = $this->readCentralDir($inHandle, $filename);

    $position = $centralDir['offset'];

    for($i = 0; $i < $centralDir['entries']; $i++){
        fseek($inHandle, $position);

        $centralHeader = $this->readCentralFileHeader($inHandle);

        $position = ftell($inHandle);

        rewind($inHandle);

        fseek($inHandle, $centralHeader['offset']);

        if(in_array($i, $index) || sizeof($index) == 0){

            if($this->print){
                print "Extract: " . $centralHeader['filename'] . "<br/>";
                flush();
            }

            if($centralHeader['external'] == 0x41FF0010 or $centralHeader['external'] == 16){
                $this->buildDirectory($targetDir, $centralHeader['filename']);
            }else{
                $this->extractFile($targetDir, $inHandle);
            }
        }
    }
    fclose($inHandle);
}

function buildDirectory($baseDir, $path){
    $parts = explode("/", $path);
    $subDir = "";

    foreach($parts as $part){

        if(!is_dir($baseDir . $subDir . $part))
            mkdir($baseDir . $subDir . $part, 0755);

        $subDir .= $part . "/";
    }
}

function _writeFile($inHandle, $outHandle, $fileSize, $gzRead = false){
    while($fileSize != 0){
        $stepSize = ($fileSize < 2048 ? $fileSize : 2048);
        fwrite($outHandle, pack('a' . $stepSize, $gzRead ? gzread($inHandle, $stepSize) : fread($inHandle, $stepSize)), $stepSize);
        $fileSize -= $stepSize;
    }
}

function extractFile($targetDir, $inHandle){

    $header = $this->readfileheader($inHandle);

    $this->buildDirectory($targetDir, dirname($header['filename']));

    $outHandle = fopen($targetDir . $header['filename'], 'wb');

    if(!$outHandle){
        echo "Can not create '" . $targetDir . $header['filename'] . "' file !!!<br/>";
        return;
    }

    $size = $header['compressed_size'];

if($header['compression'] == 0){

        $this->_writeFile($inHandle, $outHandle, $size);

}else{

    if(!$this->zlib)
        dir("ZLIB extension is needed to extract a compressed ZIP file!");

    $tmpHandle = fopen($targetDir . $header['filename'] . '.gz', 'wb');

    fwrite($tmpHandle, pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']), Chr(0x00), time(), Chr(0x00), Chr(3)), 10);

        $this->_writeFile($inHandle, $tmpHandle, $size);

    fwrite($tmpHandle, pack('VV', $header['crc'], $header['size']), 8);

    fclose($tmpHandle);

    $tmpHandle = gzopen($targetDir . $header['filename'] . '.gz', 'rb');

    $size = $header['size'];

        $this->_writeFile($tmpHandle, $outHandle, $size, true);

    gzclose($tmpHandle);

    unlink($targetDir . $header['filename'] . '.gz');
}

    fclose($outHandle);

    touch($targetDir . $header['filename'], $header['mtime']);

    return true;
}

}
?></pre>