149 lines
4.7 KiB
PHP
Executable File
149 lines
4.7 KiB
PHP
Executable File
<?php
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/* $Id$ */
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/**
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* Zip file creation class.
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* Makes zip files.
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*
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* Based on :
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*
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* http://www.zend.com/codex.php3?id=535&single=1
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* By Eric Mueller (eric@themepark.com)
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*
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* http://www.zend.com/codex.php3?id=470&single=1
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* by Denis125 (webmaster@atlant.ru)
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*
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* Official ZIP file format: http://www.pkware.com/appnote.txt
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*
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* @access public
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*/
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class zipfile
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{
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/**
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* Array to store compressed data
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*
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* @var array $datasec
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*/
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var $datasec = array();
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/**
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* Central directory
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*
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* @var array $ctrl_dir
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*/
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var $ctrl_dir = array();
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/**
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* End of central directory record
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*
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* @var string $eof_ctrl_dir
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*/
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var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
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/**
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* Last offset position
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*
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* @var integer $old_offset
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*/
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var $old_offset = 0;
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/**
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* Adds "file" to archive
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*
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* @param string file contents
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* @param string name of the file in the archive (may contains the path)
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*
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* @access public
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*/
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function addFile($data, $name)
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{
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$name = str_replace('\\', '/', $name);
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$fr = "\x50\x4b\x03\x04";
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$fr .= "\x14\x00"; // ver needed to extract
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$fr .= "\x00\x00"; // gen purpose bit flag
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$fr .= "\x08\x00"; // compression method
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$fr .= "\x00\x00\x00\x00"; // last mod time and date
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// "local file header" segment
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$unc_len = strlen($data);
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$crc = crc32($data);
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$zdata = gzcompress($data);
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$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
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$c_len = strlen($zdata);
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$fr .= pack('V', $crc); // crc32
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$fr .= pack('V', $c_len); // compressed filesize
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$fr .= pack('V', $unc_len); // uncompressed filesize
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$fr .= pack('v', strlen($name)); // length of filename
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$fr .= pack('v', 0); // extra field length
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$fr .= $name;
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// "file data" segment
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$fr .= $zdata;
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// "data descriptor" segment (optional but necessary if archive is not
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// served as file)
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$fr .= pack('V', $crc); // crc32
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$fr .= pack('V', $c_len); // compressed filesize
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$fr .= pack('V', $unc_len); // uncompressed filesize
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// add this entry to array
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$this -> datasec[] = $fr;
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$new_offset = strlen(implode('', $this->datasec));
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// now add to central directory record
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$cdrec = "\x50\x4b\x01\x02";
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$cdrec .= "\x00\x00"; // version made by
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$cdrec .= "\x14\x00"; // version needed to extract
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$cdrec .= "\x00\x00"; // gen purpose bit flag
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$cdrec .= "\x08\x00"; // compression method
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$cdrec .= "\x00\x00\x00\x00"; // last mod time & date
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$cdrec .= pack('V', $crc); // crc32
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$cdrec .= pack('V', $c_len); // compressed filesize
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$cdrec .= pack('V', $unc_len); // uncompressed filesize
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$cdrec .= pack('v', strlen($name) ); // length of filename
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$cdrec .= pack('v', 0 ); // extra field length
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$cdrec .= pack('v', 0 ); // file comment length
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$cdrec .= pack('v', 0 ); // disk number start
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$cdrec .= pack('v', 0 ); // internal file attributes
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$cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
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$cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
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$this -> old_offset = $new_offset;
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$cdrec .= $name;
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// optional extra field, file comment goes here
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// save to central directory
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$this -> ctrl_dir[] = $cdrec;
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} // end of the 'addFile()' method
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/**
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* Dumps out file
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*
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* @return string the zipped file
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*
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* @access public
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*/
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function file()
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{
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$data = implode('', $this -> datasec);
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$ctrldir = implode('', $this -> ctrl_dir);
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return
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$data .
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$ctrldir .
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$this -> eof_ctrl_dir .
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pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
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pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
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pack('V', strlen($ctrldir)) . // size of central dir
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pack('V', strlen($data)) . // offset to start of central dir
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"\x00\x00"; // .zip file comment length
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} // end of the 'file()' method
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} // end of the 'zipfile' class
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?>
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