mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-24 17:04:14 +01:00
250 lines
9.6 KiB
PHP
250 lines
9.6 KiB
PHP
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<?php
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// **************************
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// * Ziplib 0.3.1 *
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// * Created by: Seven *
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// **************************
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//
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// Simple set of functions to create a zipfile
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// according to the PKWare specifications, which
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// can be found on:
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// http://www.pkware.com/products/enterprise/white_papers/
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// <20>1989-2003, PKWARE Inc.
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// functions in here start with zl, which comes from ZipLib ;)
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// requires dostime.php
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$settings['offset'] = 1; // Holland ;)
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class Ziplib {
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var $archive;
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var $archive_fileinfo = array();
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var $archive_filecount;
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var $compr_lvl_last;
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private function zl_compress($data,$level = "",$type = "") {
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if($type != "g" && $type != "b" && $type != "n") {
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// Darnit, they forgot to set the type. Assuming gZip if any compression
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if($level >= 1 && $level <= 9) $type = "g";
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elseif($level > 9) die("Compression level set too high");
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else $type = "n";
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}
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if($type == "g") {
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$this->compr_lvl_last = 8;
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RETURN gzdeflate($data,$level);
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} elseif($type == "b") {
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$this->compr_lvl_last = 12;
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RETURN bzcompress($data,$level);
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} else {
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$this->compr_lvl_last = 0;
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RETURN $data;
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}
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}
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public function zl_add_file($data,$filename,$comp = "") {
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global $settings;
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// if we already created a file, we'll make sure it'll be there in the coming zipfile ;)
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// first, checking some data
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if(strlen($filename) > pow(2,16)-1) die("Filename $filename too long"); // ooh, dirty... dieing, will change later
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if(strlen($data) > pow(2,32)-1) die("File $filename larger then 2GB, cannot continue"); // another one, naughty me ;)
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// $comp has a special format. the first character tells me about the compression, the second one represents the level
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if(strlen($comp) == 1) {
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// they still use the old method, assuming gzip
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$comp_type = "n";
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$comp_lvl = 0;
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if($comp >= 1 && $comp <= 9) {
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$comp_type = "g";
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$comp_lvl = $comp;
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}
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} else {
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$comp_lvl = 5;
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$comp_type = "n";
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// hmmm, the new method. Is it valid?
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if ($comp[0] == "b" OR $comp[0] == "g" OR $comp[0] == "n") $comp_type = $comp[0];
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if (preg_match("/[0-9]/i",$comp[1])) $comp_lvl = $comp[1];
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}
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// ok, let's get this bitch tidy:
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// first adding a file
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$compressed = $this->zl_compress($data,$comp_lvl,$comp_type);
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$uncompressed = strlen($data);
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$newfile = "\x50\x4b\x03\x04"; // Header
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$newfile .="\x00\x00"; // Version needed to extract
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$newfile .="\x00\x00"; // general purpose bit flag
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$newfile .=pack("v",$this->compr_lvl_last); // compression method
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$newfile .=pack("v",dostime_get($settings['offset'])); // last mod file time
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$newfile .=pack("v",dosdate_get($settings['offset'])); // last mod file date
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$newfile .=pack("V",crc32($data)); // CRC32
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$newfile .=pack("V",strlen($compressed)); // compressed filesize
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$newfile .=pack("V",$uncompressed); // uncompressed filesize
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$newfile .=pack("v",strlen($filename)); // length of filename
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$newfile .="\x00\x00"; // some sort of extra field ;)
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$newfile .=$filename;
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$newfile .=$compressed;
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$this->archive .= $newfile;
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// some 'statistics' for this file ;)
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$this->archive_filecount++;
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$idf = $this->archive_filecount - 1;
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$this->archive_fileinfo[$this->archive_filecount]['comp_type'] = $this->compr_lvl_last;
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$this->archive_fileinfo[$this->archive_filecount]['size'] = strlen($data);
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$this->archive_fileinfo[$this->archive_filecount]['size_comp'] = strlen($compressed);
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$this->archive_fileinfo[$this->archive_filecount]['pkg_size'] = strlen($newfile);
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if(!empty($this->archive_fileinfo[$idf]['local_stats_pointer'])) {
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$this->archive_fileinfo[$this->archive_filecount]['local_stats_pointer'] =
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$this->archive_fileinfo[$idf]['local_stats_pointer'] +
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$this->archive_fileinfo[$idf]['pkg_size'] + 1; // HACKERDIEHACK! only way to get local_stats_pointer to '0' (for now) in zl_pack
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} else {
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$this->archive_fileinfo[$this->archive_filecount]['local_stats_pointer'] = 1;
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}
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$this->archive_fileinfo[$this->archive_filecount]['name'] = $filename;
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$this->archive_fileinfo[$this->archive_filecount]['crc32'] = crc32($data);
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unset($file,$compressed); // to avoid having data in our memory double ;)
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RETURN TRUE;
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}
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public function zl_pack($comment) {
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global $settings;
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if(strlen($comment) > pow(2,16)-1) die("Comment too long"); // that's 3
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// now the central directory structure start
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for($x=1;$x <= $this->archive_filecount;$x++) {
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$file_stats = $this->archive_fileinfo[$x];
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$cdss .= "\x50\x4b\x01\x02"; // Header
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$cdss .="\x00\x00"; // version made by
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$cdss .="\x00\x00"; // version needed to extract
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$cdss .="\x00\x00"; // general purpose bit flag
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$cdss .=pack("v",$file_stats['comp_type']); // compression method
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$cdss .=pack("v",dostime_get($settings['offset'])); // last mod file time
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$cdss .=pack("v",dosdate_get($settings['offset'])); // last mod file date
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$cdss .=pack("V",$file_stats['crc32']); // CRC32
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$cdss .=pack("V",$file_stats['size_comp']); // compressed size
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$cdss .=pack("V",$file_stats['size']); // uncompressed size
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$cdss .=pack("v",strlen($file_stats['name'])); // file name length
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$cdss .="\x00\x00"; // extra field length
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$cdss .="\x00\x00"; // file comment length
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$cdss .="\x00\x00"; // disk number start
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$cdss .="\x00\x00"; // internal file attributes
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$cdss .="\x00\x00\x00\x00"; // external file attributes
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$cdss .=pack("V",$file_stats['local_stats_pointer']-$x); // relative offset of local header
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// aka: The local_stats_pointer hack: part 2, see above
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$cdss .=$file_stats['name'];
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}
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// and final, the ending central directory structure! "WHOO HOOW!" (<28>Blur, 1998)
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$cdse = "\x50\x4b\x05\x06"; // Header
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$cdse .="\x00\x00"; // number of this disk
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$cdse .="\x00\x00"; // number of the disk with the start of the central directory
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$cdse .=pack("v",$this->archive_filecount); // total number of entries in the central directory on this disk
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$cdse .=pack("v",$this->archive_filecount); // total number of entries in the central directory
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$cdse .=pack("V",strlen($cdss)); // size of the central directory
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$cdse .=pack("V",strlen($this->archive)); // offset of start of central directory with respect to the starting disk number
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$cdse .=pack("v",strlen($comment)); // .ZIP file comment length
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$cdse .=$comment;
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return $this->archive.$cdss.$cdse;
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}
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public function zl_index_file($file) {
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$fp = @fopen($file,"rb");
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// ok, as we don't know what the exact position of everything is, we'll have to "guess" using the default sizes
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//and set values in the zipfile. Basicly this means I have to go through the entire file, could take some time.
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//Let's see if I can create an algorithm powerful enough.
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if(!$fp) die("File empty");
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$continue = 1;
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$file_count = 0;
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while($continue) {
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$content = fread($fp,30);
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$id = substr($content,0,4);
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if ($id == "\x50\x4b\x03\x04") {
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// the method used is quite simple, load a file in the memory, and walk through several parts of it using substr
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// As the PKZip format uses mostly fixed sizes for information, this isn't too hard to implement
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// First I want everything tested, before I start giving this function a nice place in the class
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$temp[$file_count]['file-size'] = ascii2dec(substr($content,18,4));
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$temp[$file_count]['filename-size'] = ascii2dec(substr($content,26,2));
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$temp[$file_count]['compression-type'] = ascii2dec(substr($content,8,2));
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$temp[$file_count]['crc'] = ascii2dec(substr($content,14,4));
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$temp[$file_count]['dostime'] = dostime_return(substr($content,10,2));
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$temp[$file_count]['dosdate'] = dosdate_return(substr($content,12,2));
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$temp[$file_count]['filename'] = fread($fp,$temp[$file_count]['filename-size']);
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// As the Zip format does not include Content type headers, I'll create a nice little array with
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// extension/content type, and a small function to retreive it
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$temp[$file_count]['file-type'] = ext2cth($temp[$file_count]['filename']);
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$temp[$file_count]['content'] = fread($fp,$temp[$file_count]['file-size']);
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if ($temp[$file_count]['compression-type'] != 0 AND $temp[$file_count]['compression-type'] != 8 AND $temp[$file_count]['compression-type'] != 12) {
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$temp[$file_count]['lasterror'] = "Compression type not supported";
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} else {
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if($temp[$file_count]['compression-type'] == 8) {
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$temp[$file_count]['content'] = gzinflate($temp[$file_count]['content']);
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} elseif ($temp[$file_count]['compression-type'] == 12) {
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$temp[$file_count]['content'] = bzdecompress($temp[$file_count]['content']);
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}
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$verify = crc32($temp[$file_count]['content']);
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if ($verify != $temp[$file_count]['crc']) {
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$temp[$file_count]['lasterror'] = "CRC did not match, possibly this zipfile is damaged";
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}
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}
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$file_count++;
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} else {
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$continue = 0;
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}
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}
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fclose($fp);
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unset($fp,$content,$file_count);
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return $temp;
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}
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}
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function zipImgsFiles($source,$zip)
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{
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$folder = opendir($source==""?"./":$source);
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while($file = readdir($folder))
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{
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if ($file == '.' || $file == '..') {
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continue;
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}
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if(is_dir($source.$file))
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{
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zipImgsFiles($source.$file."/",$zip);
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}
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else
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{
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$zip->zl_add_file(file_get_contents($source.$file),$source.$file,"g0");
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}
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}
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closedir($folder);
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return 1;
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}
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function zipFromLocation($location,$name="dhtmlx"){
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//echo $location;
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chdir($location);
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$zip = new Ziplib;
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$zip->zl_add_file(file_get_contents("dhtmlx.js"),$name.'.js',"g9");
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$zip->zl_add_file(file_get_contents("dhtmlx.css"),$name.'.css',"g9");
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$zip->zl_add_file(file_get_contents("manifest.txt"),'manifest.txt',"g9");
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zipImgsFiles("imgs/",$zip);
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$files = @scandir("./types");
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if (count($files) > 2)
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zipImgsFiles("types/",$zip);
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$outZip = $zip->zl_pack("");
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return $outZip;
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}
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?>
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