使用PHPZip解压缩文件

1. #
2. # PHPZip v1.2 by Sext ([e-mail]) 2002-11-18
3. # (Changed: 2003-03-01)
4. #
5. # Makes zip archive
6. #
7. # Based on "Zip file creation class", uses zLib
8. #
9. #
11. class PHPZip
12. {
13. function Zip($dir, $zipfilename)
14. {
15. if (@function_exists('gzcompress'))
16. {
17. $curdir = getcwd();
18. if (is_array($dir))
19. {
20. $filelist = $dir;
21. }
22. else
23. {
24. $filelist = $this -> GetFileList($dir);
25. }
27. if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
28. else chdir($curdir);
30. if (count($filelist)>0)
31. {
32. foreach($filelist as $filename)
33. {
34. if (is_file($filename))
35. {
36. $fd = fopen ($filename, "r");
37. $content = fread ($fd, filesize ($filename));
38. fclose ($fd);
40. if (is_array($dir)) $filename = basename($filename);
41. $this -> addFile($content, $filename);
42. }
43. }
44. $out = $this -> file();
46. chdir($curdir);
47. $fp = fopen($zipfilename, "w");
48. fwrite($fp, $out, strlen($out));
49. fclose($fp);
50. }
51. return 1;
52. }
53. else return 0;
54. }
56. function GetFileList($dir)
57. {
58. if (file_exists($dir))
59. {
60. $args = func_get_args();
61. $pref = $args[1];
63. $dh = opendir($dir);
64. while($files = readdir($dh))
65. {
66. if (($files!=".")&&($files!=".."))
67. {
68. if (is_dir($dir.$files))
69. {
70. $curdir = getcwd();
71. chdir($dir.$files);
72. $file = array_merge($file, $this -> GetFileList("", "$pref$files/"));
73. chdir($curdir);
74. }
75. else $file[]=$pref.$files;
76. }
77. }
78. closedir($dh);
79. }
80. return $file;
81. }
83. var $datasec = array();
84. var $ctrl_dir = array();
85. var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
86. var $old_offset = 0;
88. /**
89. * Converts an Unix timestamp to a four byte DOS date and time format (date
90. * in high two bytes, time in low two bytes allowing magnitude comparison).
91. *
92. * @param integer the current Unix timestamp
93. *
94. * @return integer the current date in a four byte DOS format
95. *
96. * @access private
97. */
98. function unix2DosTime($unixtime = 0) {
99. $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
101. if ($timearray['year'] $timearray['year'] = 1980;
102. $timearray['mon'] = 1;
103. $timearray['mday'] = 1;
104. $timearray['hours'] = 0;
105. $timearray['minutes'] = 0;
106. $timearray['seconds'] = 0;
107. } // end if
109. return (($timearray['year'] - 1980) ($timearray['hours'] > 1);
110. } // end of the 'unix2DosTime()' method
112. /**
113. * Adds "file" to archive
114. *
115. * @param string file contents
116. * @param string name of the file in the archive (may contains the path)
117. * @param integer the current timestamp
118. *
119. * @access public
120. */
121. function addFile($data, $name, $time = 0)
122. {
123. $name = str_replace('', '/', $name);
125. $dtime = dechex($this->unix2DosTime($time));
126. $hexdtime = 'x' . $dtime[6] . $dtime[7]
127. . 'x' . $dtime[4] . $dtime[5]
128. . 'x' . $dtime[2] . $dtime[3]
129. . 'x' . $dtime[0] . $dtime[1];
130. eval('$hexdtime = "' . $hexdtime . '";');
132. $fr = "x50x4bx03x04";
133. $fr .= "x14x00"; // ver needed to extract
134. $fr .= "x00x00"; // gen purpose bit flag
135. $fr .= "x08x00"; // compression method
136. $fr .= $hexdtime; // last mod time and date
138. // "local file header" segment
139. $unc_len = strlen($data);
140. $crc = crc32($data);
141. $zdata = gzcompress($data);
142. $c_len = strlen($zdata);
143. $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
144. $fr .= pack('V', $crc); // crc32
145. $fr .= pack('V', $c_len); // compressed filesize
146. $fr .= pack('V', $unc_len); // uncompressed filesize
147. $fr .= pack('v', strlen($name)); // length of filename
148. $fr .= pack('v', 0); // extra field length
149. $fr .= $name;
151. // "file data" segment
152. $fr .= $zdata;
154. // "data descriptor" segment (optional but necessary if archive is not
155. // served as file)
156. $fr .= pack('V', $crc); // crc32
157. $fr .= pack('V', $c_len); // compressed filesize
158. $fr .= pack('V', $unc_len); // uncompressed filesize
160. // add this entry to array
161. $this -> datasec[] = $fr;
162. $new_offset = strlen(implode('', $this->datasec));
164. // now add to central directory record
165. $cdrec = "x50x4bx01x02";
166. $cdrec .= "x00x00"; // version made by
167. $cdrec .= "x14x00"; // version needed to extract
168. $cdrec .= "x00x00"; // gen purpose bit flag
169. $cdrec .= "x08x00"; // compression method
170. $cdrec .= $hexdtime; // last mod time & date
171. $cdrec .= pack('V', $crc); // crc32
172. $cdrec .= pack('V', $c_len); // compressed filesize
173. $cdrec .= pack('V', $unc_len); // uncompressed filesize
174. $cdrec .= pack('v', strlen($name) ); // length of filename
175. $cdrec .= pack('v', 0 ); // extra field length
176. $cdrec .= pack('v', 0 ); // file comment length
177. $cdrec .= pack('v', 0 ); // disk number start
178. $cdrec .= pack('v', 0 ); // internal file attributes
179. $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
181. $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
182. $this -> old_offset = $new_offset;
184. $cdrec .= $name;
186. // optional extra field, file comment goes here
187. // save to central directory
188. $this -> ctrl_dir[] = $cdrec;
189. } // end of the 'addFile()' method
191. /**
192. * Dumps out file
193. *
194. * @return string the zipped file
195. *
196. * @access public
197. */
198. function file()
199. {
200. $data = implode('', $this -> datasec);
201. $ctrldir = implode('', $this -> ctrl_dir);
203. return
204. $data .
205. $ctrldir .
206. $this -> eof_ctrl_dir .
207. pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
208. pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
209. pack('V', strlen($ctrldir)) . // size of central dir
210. pack('V', strlen($data)) . // offset to start of central dir
211. "x00x00"; // .zip file comment length
212. } // end of the 'file()' method
214. } // end of the 'PHPZip' class
215. ?>
217. //使用方法
219. $z = new PHPZip(); //新建立一个zip的类
221. 方法一：
222. $z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有档案
224. 方法二：
225. $files=array('1.txt','gb.txt');
226. $files[]='5.txt';
227. $z -> Zip($files, "out2.zip"); //添加文件列表
229. 方法三：
230. $z -> Zip("/usr/local/sext/", "out3.zip"); //添加指定目录
231. ?>

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解压缩, PHPZip