File class\class.zipfile.php

1:	<?php
2:	//
3:	/**
4:	* package::i.tools
5:	*
6:	* php-downloader v1.0 - www.ipunkt.biz
7:	*
8:	* (c) 2002 - www.ipunkt.biz (rok)
9:	*
10:	* Zip file creation class.
11:	* Makes zip files.
12:	*
13:	* Based on :
14:	*
15:	* https://www.zend.com/codex.php?id=535&single=1
16:	* By Eric Mueller <eric@themepark.com>
17:	*
18:	* https://www.zend.com/codex.php?id=470&single=1
19:	* by Denis125 <webmaster@atlant.ru>
20:	*
21:	* a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
22:	* date and time of the compressed file
23:	*
24:	* Official ZIP file format: http://www.pkware.com/appnote.txt
25:	*
26:	* @copyright (c) 2002 - www.ipunkt.biz (rok)
27:	* @access public
28:	* @package kernel
29:	* @subpackage core
30:	*/
31:	class Zipfile
32:	{
33:	/**
34:	* Array to store compressed data
35:	*
36:	* @var array $datasec
37:	*/
38:	public $datasec = array();
39:
40:	/**
41:	* Central directory
42:	*
43:	* @var array $ctrl_dir
44:	*/
45:	public $ctrl_dir = array();
46:
47:	/**
48:	* End of central directory record
49:	*
50:	* @var string $eof_ctrl_dir
51:	*/
52:	public $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
53:
54:	/**
55:	* Last offset position
56:	*
57:	* @var integer $old_offset
58:	*/
59:	public $old_offset = 0;
60:
61:	/**
62:	* Converts an Unix timestamp to a four byte DOS date and time format (date
63:	* in high two bytes, time in low two bytes allowing magnitude comparison).
64:	*
65:	* @param int $unixtime the current Unix timestamp
66:	*
67:	* @return integer the current date in a four byte DOS format
68:	* @access private
69:	*/
70:	public function unix2DosTime($unixtime = 0)
71:	{
72:	$timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
73:	if ($timearray['year'] < 1980) {
74:	$timearray['year'] = 1980;
75:	$timearray['mon'] = 1;
76:	$timearray['mday'] = 1;
77:	$timearray['hours'] = 0;
78:	$timearray['minutes'] = 0;
79:	$timearray['seconds'] = 0;
80:	} // end if
81:
82:	return (($timearray['year'] - 1980) << 25) \| ($timearray['mon'] << 21) \| ($timearray['mday'] << 16) \| ($timearray['hours'] << 11) \| ($timearray['minutes'] << 5) \| ($timearray['seconds'] >> 1);
83:	} // end of the 'unix2DosTime()' method
84:
85:	/**
86:	* Adds "file" to archive
87:	*
88:	* @param string $data file contents
89:	* @param string $name name of the file in the archive (may contains the path)
90:	* @param integer $time the current timestamp
91:	* @access public
92:	*/
93:	public function addFile($data, $name, $time = 0)
94:	{
95:	$name = str_replace('\\', '/', $name);
96:
97:	$dtime = dechex($this->unix2DosTime($time));
98:	$hexdtime = '\x' . $dtime[6] . $dtime[7] . '\x' . $dtime[4] . $dtime[5] . '\x' . $dtime[2] . $dtime[3] . '\x' . $dtime[0] . $dtime[1];
99:	eval('$hexdtime = "' . $hexdtime . '";');
100:
101:	$fr = "\x50\x4b\x03\x04";
102:	$fr .= "\x14\x00"; // ver needed to extract
103:	$fr .= "\x00\x00"; // gen purpose bit flag
104:	$fr .= "\x08\x00"; // compression method
105:	$fr .= $hexdtime; // last mod time and date
106:	// "local file header" segment
107:	$unc_len = strlen($data);
108:	$crc = crc32($data);
109:	$zdata = gzcompress($data);
110:	$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
111:	$c_len = strlen($zdata);
112:	$fr .= pack('V', $crc); // crc32
113:	$fr .= pack('V', $c_len); // compressed filesize
114:	$fr .= pack('V', $unc_len); // uncompressed filesize
115:	$fr .= pack('v', strlen($name)); // length of filename
116:	$fr .= pack('v', 0); // extra field length
117:	$fr .= $name;
118:	// "file data" segment
119:	$fr .= $zdata;
120:	// "data descriptor" segment (optional but necessary if archive is not
121:	// served as file)
122:	$fr .= pack('V', $crc); // crc32
123:	$fr .= pack('V', $c_len); // compressed filesize
124:	$fr .= pack('V', $unc_len); // uncompressed filesize
125:	// add this entry to array
126:	$this->datasec[] = $fr;
127:	$new_offset = strlen(implode('', $this->datasec));
128:	// now add to central directory record
129:	$cdrec = "\x50\x4b\x01\x02";
130:	$cdrec .= "\x00\x00"; // version made by
131:	$cdrec .= "\x14\x00"; // version needed to extract
132:	$cdrec .= "\x00\x00"; // gen purpose bit flag
133:	$cdrec .= "\x08\x00"; // compression method
134:	$cdrec .= $hexdtime; // last mod time & date
135:	$cdrec .= pack('V', $crc); // crc32
136:	$cdrec .= pack('V', $c_len); // compressed filesize
137:	$cdrec .= pack('V', $unc_len); // uncompressed filesize
138:	$cdrec .= pack('v', strlen($name)); // length of filename
139:	$cdrec .= pack('v', 0); // extra field length
140:	$cdrec .= pack('v', 0); // file comment length
141:	$cdrec .= pack('v', 0); // disk number start
142:	$cdrec .= pack('v', 0); // internal file attributes
143:	$cdrec .= pack('V', 32); // external file attributes - 'archive' bit set
144:	$cdrec .= pack('V', $this->old_offset); // relative offset of local header
145:	$this->old_offset = $new_offset;
146:	$cdrec .= $name;
147:	// optional extra field, file comment goes here
148:	// save to central directory
149:	$this->ctrl_dir[] = $cdrec;
150:	} // end of the 'addFile()' method
151:
152:	/**
153:	* Dumps out file
154:	*
155:	* @return string the zipped file
156:	* @access public
157:	*/
158:	public function file()
159:	{
160:	$data = implode('', $this->datasec);
161:	$ctrldir = implode('', $this->ctrl_dir);
162:
163:	return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', count($this->ctrl_dir)) . // total # of entries "on this disk"
164:	pack('v', count($this->ctrl_dir)) . // total # of entries overall
165:	pack('V', strlen($ctrldir)) . // size of central dir
166:	pack('V', strlen($data)) . // offset to start of central dir
167:	"\x00\x00"; // .zip file comment length
168:	} // end of the 'file()' method
169:	} // end of the 'zipfile' class
170:
171:

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