Source for file jZipCreator.class.php

Documentation is available at jZipCreator.class.php

<?php
/**
* @package jelix
* @subpackage utils
* @author Laurent Jouanneau
* @contributor Julien Issler
* @link http://www.jelix.org
* @licence GNU Lesser General Public Licence see LICENCE file or http://www.gnu.org/licenses/lgpl.html
*/
/**
* Class to create a zip file.
* @package jelix
* @subpackage utils
* @link http://www.pkware.com/business_and_developers/developer/appnote/ Official ZIP file format
*/
class jZipCreator {
/**
* contains all file records
* @var array $fileRecords
*/
protected $fileRecords = array();
/**
* Contains the central directory
* @var array $centralDirectory
*/
protected $centralDirectory = array();
/**
* Offset of the central directory
* @var integer $centralDirOffset
*/
protected $centralDirOffset = 0;
/**
* adds a physical file to the zip archive
*
* @param string $filename the path of the physical file you want to add
* @param string $zipPath the path of the file inside the zip archive
*/
public function addFile($filename, $zipFileName=''){
if($zipFileName == '') $zipFileName = $filename;
if(file_exists($filename)){
$this->addContentFile($zipFileName, file_get_contents($filename), filemtime($filename));
}else{
throw new jException('jelix~errors.file.notexists', $filename);
}
}
/**
* adds the content of a directory to the zip archive
*
* @param string $path the path of the physical directory you want to add
*/
public function addDir($path, $zipDirPath='', $recursive = false){
if(file_exists($path)){
if($zipDirPath !='' && substr($zipDirPath,-1,1) != '/')
$zipDirPath.='/';
if(substr($path,-1,1) != '/')
$path.='/';
if ($handle = opendir($path)) {
$this->addEmptyDir($zipDirPath,filemtime($path));
while (($file = readdir($handle)) !== false) {
if($file == '.' || $file == '..')
continue;
if (!is_dir($path.$file))
$this->addFile($path.$file, $zipDirPath.$file);
else if ($recursive)
$this->addDir($path.$file,$zipDirPath.$file, true);
}
closedir($handle);
}
}else{
throw new jException('jelix~errors.file.notexists', $path);
}
}
/**
* add a "logical" file to the zip archive
*
* @param string $zipFileName the path of the file into the zip archive
* @param string $content the content of the file
* @param integer $filetime the time modification of the file
*/
public function addContentFile($zipFileName, $content, $filetime = 0){
$filetime = $this->_getDOSTimeFormat($filetime);
/*
generation of the file record
file record:
- local file header signature 4 bytes (0x04034b50)
- version needed to extract 2 bytes 14
- general purpose bit flag 2 bytes 0
- compression method 2 bytes 0x8
- last mod file time 2 bytes (fileinfo)
- last mod file date 2 bytes (fileinfo)
- crc-32 4 bytes (fileinfo)
- compressed size 4 bytes (fileinfo)
- uncompressed size 4 bytes (fileinfo)
- file name length 2 bytes (fileinfo)
- extra field length 2 bytes (here 0) (fileinfo)
- file name (variable size)
- extra field (variable size) (here nothing)
- compressed content
*/
$zipFileName = str_replace('\\', '/', $zipFileName);
$zippedcontent = substr(gzcompress($content), 2, -4); // compress and fix crc bug
$fileinfo = $filetime.pack('V', crc32($content));
$fileinfo .= pack('V', strlen($zippedcontent)). pack('V', strlen($content));
$fileinfo .= pack('v', strlen($zipFileName))."\x00\x00";
$filerecord = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00".$fileinfo.
$zipFileName.$zippedcontent;
$this->fileRecords[] = $filerecord;
$this->_addCentralDirEntry($zipFileName, $fileinfo);
$this->centralDirOffset += strlen($filerecord);
}
/**
* adds an empty dir to the zip file
*/
public function addEmptyDir($name, $time=0){
$time = $this->_getDOSTimeFormat($time);
$name = str_replace('\\', '/', $name);
if(substr($name,-1,1)!=='/')
$name .= '/';
if($name == '/')
return;
$fileinfo = $time."\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
pack('v', strlen($name))."\x00\x00";
$filerecord = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00".$fileinfo.$name;
$this->fileRecords[] = $filerecord;
$this->_addCentralDirEntry($name, $fileinfo, true);
$this->centralDirOffset += strlen($filerecord);
}
/**
* create the contenu of the zip file
* @return string the content of the zip file
*/
public function getContent(){
$centraldir = implode('', $this->centralDirectory);
$c = pack('v', count($this ->centralDirectory));
/*
zip file :
- file records
- central dir
- end of central dir signature 4 bytes (0x06054b50)
- number of this disk 2 bytes (0 here)
- number of the disk with the
start of the central directory 2 bytes (0 here)
- total number of entries in the
central directory on this disk 2 bytes
- total number of entries in
the central directory 2 bytes
- size of the central directory 4 bytes
- offset of start of central directory with respect to
the starting disk number 4 bytes
- .ZIP file comment length 2 bytes
- .ZIP file comment (variable size)
*/
return implode('', $this->fileRecords).$centraldir."\x50\x4b\x05\x06\x00\x00\x00\x00".$c.$c.
pack('V', strlen($centraldir)).pack('V', $this ->centralDirOffset)."\x00\x00";
}
protected function _getDOSTimeFormat($timestamp){
// converts unix timestamp to dos binary format
if($timestamp == 0)
$timestamp = time();
elseif($timestamp < 315529200) // 01/01/1980
$timestamp = 315529200;
$dt = getdate($timestamp);
return pack('V',($dt['seconds'] >> 1) | ($dt['minutes'] << 5) | ($dt['hours'] << 11) |
($dt['mday'] << 16) | ($dt['mon'] << 21) | (($dt['year'] - 1980) << 25));
}
protected function _addCentralDirEntry($name, $info, $isDir = false){
/*
register the file into the central directory record
it contains an header for each file
- central file header signature 4 bytes (0x02014b50)
- version made by 2 bytes 0=DOS
- version needed to extract 2 bytes 0x14
- general purpose bit flag 2 bytes 0
- compression method 2 bytes 0x8
- last mod file time 2 bytes (fileinfo)
- last mod file date 2 bytes (fileinfo)
- crc-32 4 bytes (fileinfo)
- compressed size 4 bytes (fileinfo)
- uncompressed size 4 bytes (fileinfo)
- file name length 2 bytes (fileinfo)
- extra field length 2 bytes 0 (fileinfo)
- file comment length 2 bytes 0
- disk number start 2 bytes 0
- internal file attributes 2 bytes 0
- external file attributes 4 bytes 32 : 'archive' bit set ; 16 : for empty folder support
- relative offset of local header 4 bytes
- file name (variable size)
- extra field (variable size)
- file comment (variable size)
*/
$cdrecord = "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00".$info;
$cdrecord .= "\x00\x00\x00\x00\x00\x00";
if($isDir)
$cdrecord .= pack('V', 16);
else
$cdrecord .= pack('V', 32);
$cdrecord .= pack('V', $this ->centralDirOffset );
$cdrecord .= $name;
$this->centralDirectory[] = $cdrecord;
}
}
?>

Documentation generated on Wed, 07 Sep 2011 13:48:15 +0200 by phpDocumentor 1.4.3