One Fuc* up PHP problem ! HELP !
 

I'm using this class and this function to zip and unzip some files. Unfortunately the file are all scrambled up when unzipped.

the weirdest part is that if I intercept the zip file and open it with Winzip the files are fine and if I create a zipfile with winzip I can unzip it corretly with my unzip function.

PLEASE help me I'm going crazy over this !


class zipfile
{

var $datasec = array(); // array to store compressed data
var $ctrl_dir = array(); // central directory
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
var $old_offset = 0;

function add_dir($name)

// adds "directory" to archive - do this before putting any files in directory!
// $name - name of directory... like this: "path/"
// ...then you can add files using add_file with names like "path/file.txt"
{
$name = str_replace("\\", "/", $name);

$fr = "\x50\x4b\x03\x04";
$fr .= "\x0a\x00"; // ver needed to extract
$fr .= "\x00\x00"; // gen purpose bit flag
$fr .= "\x00\x00"; // compression method
$fr .= "\x00\x00\x00\x00"; // last mod time and date

$fr .= pack("V",0); // crc32
$fr .= pack("V",0); //compressed filesize
$fr .= pack("V",0); //uncompressed filesize
$fr .= pack("v", strlen($name) ); //length of pathname
$fr .= pack("v", 0 ); //extra field length
$fr .= $name;
// end of "local file header" segment

// no "file data" segment for path

// "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));

// ext. file attributes mirrors MS-DOS directory attr byte, detailed
// at http://support.microsoft.com/support.../Q125/0/19.asp

// now add to central record
$cdrec = "\x50\x4b\x01\x02";
$cdrec .="\x00\x00"; // version made by
$cdrec .="\x0a\x00"; // version needed to extract
$cdrec .="\x00\x00"; // gen purpose bit flag
$cdrec .="\x00\x00"; // compression method
$cdrec .="\x00\x00\x00\x00"; // last mod time & date
$cdrec .= pack("V",0); // crc32
$cdrec .= pack("V",0); //compressed filesize
$cdrec .= pack("V",0); //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
$ext = "\x00\x00\x10\x00";
$ext = "\xff\xff\xff\xff";
$cdrec .= pack("V", 16 ); //external file attributes - 'directory' 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 array
$this -> ctrl_dir[] = $cdrec;


}


function add_file($data, $name)

// adds "file" to archive
// $data - file contents
// $name - name of file in archive. Add path if your want

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

$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 .= "\x00\x00\x00\x00"; // last mod time and date

$unc_len = strlen($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;
// end of "local file header" segment

// "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 .="\x00\x00\x00\x00"; // 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", $this -> old_offset ); //relative offset of local header
// echo "old offset is ".$this->old_offset.", new offset is $new_offset<br>";
$this -> old_offset = $new_offset;

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

function file() { // dump out 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 unzip($FileName){
$path = dirname($FileName).'/';
$Time = filemtime($FileName);
$Size = filesize($FileName);

$oF = fopen($FileName, 'rb');
$vZ = fread($oF, $Size);
fclose($oF);

$aE = explode("\x50\x4b\x05\x06", $vZ);
$aP = unpack('x16/v1CL', $aE[1]);
$Comment = substr($aE[1], 18, $aP['CL']);


$Comment = strtr($Comment, array("\r\n" => "\n",
"\r" => "\n"));
$aE = explode("\x50\x4b\x01\x02", $vZ);
$aE = explode("\x50\x4b\x03\x04", $aE[0]);
array_shift($aE);

foreach ($aE as $vZ) {
$aI = array();
$aI['E'] = 0;
$aI['EM'] = '';

$aP = unpack('v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL', $vZ);
$bE = ($aP['GPF'] && 0x0001) ? TRUE : FALSE;
$nF = $aP['FNL'];

if ($aP['GPF'] & 0x0008) {
$aP1 = unpack('V1CRC/V1CS/V1UCS', substr($vZ, -12));

$aP['CRC'] = $aP1['CRC'];
$aP['CS'] = $aP1['CS'];
$aP['UCS'] = $aP1['UCS'];

$vZ = substr($vZ, 0, -12);
}

$aI['N'] = substr($vZ, 26, $nF);

if (substr($aI['N'], -1) == '/')
continue;

$aI['P'] = dirname($aI['N']);
$aI['P'] = $aI['P'] == '.' ? '' : $aI['P'];
$aI['N'] = basename($aI['N']);

$vZ = substr($vZ, 26 + $nF);

if (strlen($vZ) != $aP['CS']) {
$aI['E'] = 1;
$aI['EM'] = 'Compressed size is not equal with the value in header information.';
} else {
if ($bE) {
$aI['E'] = 5;
$aI['EM'] = 'File is encryption is not supported from this class.';
} else {
switch($aP['CM']) {
case 0:
break;
case 8:
$vZ = gzinflate($vZ);
break;
case 12:
if (! extension_loaded('bz2')) {
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN')
@dl('php_bz2.dll');
else
@dl('bz2.so');

}

if (extension_loaded('bz2'))
$vZ = bzdecompress($vZ);
else {
$aI['E'] = 7;
$aI['EM'] = "PHP BZIP2 extension not available.";
}
break;

default:
$aI['E'] = 6;
$aI['EM'] = "De-/Compression method {$aP['CM']} is not supported.";
}

if (! $aI['E']) {
if ($vZ === FALSE) {
$aI['E'] = 2;
$aI['EM'] = 'Decompression of data failed.';
} else {
if (strlen($vZ) != $aP['UCS']) {
$aI['E'] = 3;
$aI['EM'] = 'Uncompressed size is not equal with the value in header information.';
} else {
if (crc32($vZ) != $aP['CRC']) {
$aI['E'] = 4;
$aI['EM'] = 'CRC32 checksum is not equal with the value in header information.';
}
}
}
}
}
}

$aI['D'] = $vZ;

// DOS to UNIX timestamp
$aI['T'] = mktime(($aP['FT'] & 0xf800) >> 11,
($aP['FT'] & 0x07e0) >> 5,
($aP['FT'] & 0x001f) << 1,
($aP['FD'] & 0x01e0) >> 5,
($aP['FD'] & 0x001f),
(($aP['FD'] & 0xfe00) >> 9) + 1980);

if ($aI['P'] != '') {
mkdir($path.$aI['P']);
$f = fopen($path.$aI['P'].'/'.$aI['N'], 'w+');
} else
$f = fopen($path.$aI['N'], 'w+');
fwrite($f, $aI['D']);
fclose($f);
}

}

That's the zend php zip snippet, circa 5 years ago, and totally fucking horrible.

Try -

$filename = 'foo.zip';
$cmd = 'unzip '.$filename;
$result = `$cmd`;

Cool it works !

but I need the unzip function to be distributed on several server which I can't assume any configuration. Will you code works anyway (Or what does it requires).

(not sur what the ` ` means in php. guess it's some kind of shell execution)

Thanks A LOT !

correct .

You're gonna be hard-pressed finding a linux box without the unzip command.

I really need my code to be portable on what ever plateform there is. Can I assume the 95&#37; + will have the unzip program installed with php ?

It's default on linux, and the ZIP GNU library is GPL for windows too.
Distribute it with your product.

That said, if you were contemplating using that 'code' above, I don't think unzip is gonna be your biggest problem.....:2 cents: