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<?php
class zipfile
{
/*
zipfile class, for reading or writing .zip files
See http://www.gamingg.net for more of my work
Based on tutorial given by John Coggeshall at http://www.zend.com/zend/spotlight/creating-zip-files3.php
Copyright (C) Joshua Townsend and licensed under the GPL
Version 1.0
*/
var $datasec = array(); // array to store compressed data
var $files = array(); // array of uncompressed files
var $dirs = array(); // array of directories that have been created already
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;
var $basedir = ".";
function create_dir($name) // Adds a directory to the zip with the name $name
{
$name = str_replace("\\", "/", $name);
$fr = "\x50\x4b\x03\x04";
$fr .= "\x0a\x00"; // version needed to extract
$fr .= "\x00\x00"; // general 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",0); //crc32
$fr .= pack("V",0); //compressed filesize
$fr .= pack("V",0); //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/kb/articles/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"; // general purpose bit flag
$cdrec .="\x00\x00"; // compression method
$cdrec .="\x00\x00\x00\x00"; // last mod time and 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
$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;
$this->dirs[] = $name;
}
function create_file($data, $name) // Adds a file to the path specified by $name with the contents $data
{
$name = str_replace("\\", "/", $name);
$fr = "\x50\x4b\x03\x04";
$fr .= "\x14\x00"; // version needed to extract
$fr .= "\x00\x00"; // general 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);
$zdata = substr($zdata, 2, -4); // 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"; // general 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
$this->old_offset = $new_offset;
$cdrec .= $name;
// optional extra field, file comment goes here
// save to central directory
$this->ctrl_dir[] = $cdrec;
}
function read_zip($name)
{
// Clear current file
$this->datasec = array();
// File information
$this->name = $name;
$this->mtime = filemtime($name);
$this->size = filesize($name);
// Read file
$fh = fopen($name, "rb");
$filedata = fread($fh, $this->size);
fclose($fh);
// Break into sections
$filesecta = explode("\x50\x4b\x05\x06", $filedata);
// ZIP Comment
$unpackeda = unpack('x16/v1length', $filesecta[1]);
$this->comment = substr($filesecta[1], 18, $unpackeda['length']);
$this->comment = str_replace(array("\r\n", "\r"), "\n", $this->comment); // CR + LF and CR -> LF
// Cut entries from the central directory
$filesecta = explode("\x50\x4b\x01\x02", $filedata);
$filesecta = explode("\x50\x4b\x03\x04", $filesecta[0]);
array_shift($filesecta); // Removes empty entry/signature
foreach($filesecta as $filedata)
{
// CRC:crc, FD:file date, FT: file time, CM: compression method, GPF: general purpose flag, VN: version needed, CS: compressed size, UCS: uncompressed size, FNL: filename length
$entrya = array();
$entrya['error'] = "";
$unpackeda = unpack("v1version/v1general_purpose/v1compress_method/v1file_time/v1file_date/V1crc/V1size_compressed/V1size_uncompressed/v1filename_length", $filedata);
// Check for encryption
$isencrypted = (($unpackeda['general_purpose'] & 0x0001) ? true : false);
// Check for value block after compressed data
if($unpackeda['general_purpose'] & 0x0008)
{
$unpackeda2 = unpack("V1crc/V1size_compressed/V1size_uncompressed", substr($filedata, -12));
$unpackeda['crc'] = $unpackeda2['crc'];
$unpackeda['size_compressed'] = $unpackeda2['size_uncompressed'];
$unpackeda['size_uncompressed'] = $unpackeda2['size_uncompressed'];
unset($unpackeda2);
}
$entrya['name'] = substr($filedata, 26, $unpackeda['filename_length']);
if(substr($entrya['name'], -1) == "/") // skip directories
{
continue;
}
$entrya['dir'] = dirname($entrya['name']);
$entrya['dir'] = ($entrya['dir'] == "." ? "" : $entrya['dir']);
$entrya['name'] = basename($entrya['name']);
$filedata = substr($filedata, 26 + $unpackeda['filename_length']);
if(strlen($filedata) != $unpackeda['size_compressed'])
{
$entrya['error'] = "Compressed size is not equal to the value given in header.";
}
if($isencrypted)
{
$entrya['error'] = "Encryption is not supported.";
}
else
{
switch($unpackeda['compress_method'])
{
case 0: // Stored
// Not compressed, continue
break;
case 8: // Deflated
$filedata = gzinflate($filedata);
break;
case 12: // BZIP2
if(!extension_loaded("bz2"))
{
@dl((strtolower(substr(PHP_OS, 0, 3)) == "win") ? "php_bz2.dll" : "bz2.so");
}
if(extension_loaded("bz2"))
{
$filedata = bzdecompress($filedata);
}
else
{
$entrya['error'] = "Required BZIP2 Extension not available.";
}
break;
default:
$entrya['error'] = "Compression method ({$unpackeda['compress_method']}) not supported.";
}
if(!$entrya['error'])
{
if($filedata === false)
{
$entrya['error'] = "Decompression failed.";
}
elseif(strlen($filedata) != $unpackeda['size_uncompressed'])
{
$entrya['error'] = "File size is not equal to the value given in header.";
}
elseif(crc32($filedata) != $unpackeda['crc'])
{
$entrya['error'] = "CRC32 checksum is not equal to the value given in header.";
}
}
$entrya['filemtime'] = mktime(($unpackeda['file_time'] & 0xf800) >> 11,($unpackeda['file_time'] & 0x07e0) >> 5, ($unpackeda['file_time'] & 0x001f) << 1, ($unpackeda['file_date'] & 0x01e0) >> 5, ($unpackeda['file_date'] & 0x001f), (($unpackeda['file_date'] & 0xfe00) >> 9) + 1980);
$entrya['data'] = $filedata;
}
$this->files[] = $entrya;
}
return $this->files;
}
function add_file($file, $dir = ".", $file_blacklist = array(), $ext_blacklist = array())
{
$file = str_replace("\\", "/", $file);
$dir = str_replace("\\", "/", $dir);
if(strpos($file, "/") !== false)
{
$dira = explode("/", "{$dir}/{$file}");
$file = array_shift($dira);
$dir = implode("/", $dira);
unset($dira);
}
while(substr($dir, 0, 2) == "./")
{
$dir = substr($dir, 2);
}
while(substr($file, 0, 2) == "./")
{
$file = substr($file, 2);
}
if(!in_array($dir, $this->dirs))
{
if($dir == ".")
{
$this->create_dir("./");
}
$this->dirs[] = $dir;
}
if(in_array($file, $file_blacklist))
{
return true;
}
foreach($ext_blacklist as $ext)
{
if(substr($file, -1 - strlen($ext)) == ".{$ext}")
{
return true;
}
}
$filepath = (($dir && $dir != ".") ? "{$dir}/" : "").$file;
if(is_dir("{$this->basedir}/{$filepath}"))
{
$dh = opendir("{$this->basedir}/{$filepath}");
while(($subfile = readdir($dh)) !== false)
{
if($subfile != "." && $subfile != "..")
{
$this->add_file($subfile, $filepath, $file_blacklist, $ext_blacklist);
}
}
closedir($dh);
}
else
{
$this->create_file(implode("", file("{$this->basedir}/{$filepath}")), $filepath);
}
return true;
}
function zipped_file() // return zipped file contents
{
$data = implode("", $this->datasec);
$ctrldir = implode("", $this->ctrl_dir);
return $data.
$ctrldir.
$this->eof_ctrl_dir.
pack("v", sizeof($this->ctrl_dir)). // total number of entries "on this disk"
pack("v", sizeof($this->ctrl_dir)). // total number of entries overall
pack("V", strlen($ctrldir)). // size of central dir
pack("V", strlen($data)). // offset to start of central dir
"\x00\x00"; // .zip file comment length
}
}
?>
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