Zip dump support
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123
libraries/zip.lib.php3
Executable file
123
libraries/zip.lib.php3
Executable file
@@ -0,0 +1,123 @@
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<?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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/**
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* Zip file class
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*
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* @param
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*
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* @return
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*/
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class zipfile
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{
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var $datasec = array(); // array to store compressed data
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var $ctrl_dir = array(); // central directory
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var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; // end of Central directory record
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var $old_offset = 0;
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function add_file($data, $name)
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// adds "file" to archive
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// $data - file contents
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// $name - name of file in archive. Add path if your want
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{
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$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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$unc_len = strlen($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 .= $name;
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// end of "local file header" segment
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// "file data" segment
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$fr .= $zdata;
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// "data descriptor" segment (optional but necessary if archive is not served as file)
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$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[] = $cdrec;
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}
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function file() { // dump out file
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$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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}
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}
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?>
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