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php打包一组文件为zip压缩包的类

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  2. <?php
  3. /**
  4. * Zip file creation class.
  5. * Makes zip files.
  6. *
  7. * @access public
  8. */
  9. class zipfile
  10. {
  11. /**
  12. * Array to store compressed data
  13. *
  14. * @public array $datasec
  15. */
  16. public $datasec = array();
  18. /**
  19. * Central directory
  20. *
  21. * @public array $ctrl_dir
  22. */
  23. public $ctrl_dir = array();
  25. /**
  26. * End of central directory record
  27. *
  28. * @public string $eof_ctrl_dir
  29. */
  30. public $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  32. /**
  33. * Last offset position
  34. *
  35. * @public integer $old_offset
  36. */
  37. public $old_offset = 0;
  40. /**
  41. * Converts an Unix timestamp to a four byte DOS date and time format (date
  42. * in high two bytes, time in low two bytes allowing magnitude comparison).
  43. *
  44. * @param integer the current Unix timestamp
  45. *
  46. * @return integer the current date in a four byte DOS format
  47. *
  48. * @access private
  49. */
  50. function unix2DosTime($unixtime = 0) {
  51. $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
  53. if ($timearray['year'] < 1980) {
  54. $timearray['year'] = 1980;
  55. $timearray['mon'] = 1;
  56. $timearray['mday'] = 1;
  57. $timearray['hours'] = 0;
  58. $timearray['minutes'] = 0;
  59. $timearray['seconds'] = 0;
  60. } // end if
  62. return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
  63. ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
  64. } // end of the 'unix2DosTime()' method
  67. /**
  68. * Adds "file" to archive
  69. *
  70. * @param string file contents
  71. * @param string name of the file in the archive (may contains the path)
  72. * @param integer the current timestamp
  73. *
  74. * @access public
  75. */
  76. function addFile($data, $name, $time = 0)
  77. {
  78. $name = str_replace('\\', '/', $name);
  80. $dtime = dechex($this->unix2DosTime($time));
  81. $hexdtime = '\x' . $dtime[6] . $dtime[7]
  82. . '\x' . $dtime[4] . $dtime[5]
  83. . '\x' . $dtime[2] . $dtime[3]
  84. . '\x' . $dtime[0] . $dtime[1];
  85. eval('$hexdtime = "' . $hexdtime . '";');
  87. $fr = "\x50\x4b\x03\x04";
  88. $fr .= "\x14\x00"; // ver needed to extract
  89. $fr .= "\x00\x00"; // gen purpose bit flag
  90. $fr .= "\x08\x00"; // compression method
  91. $fr .= $hexdtime; // last mod time and date
  93. // "local file header" segment
  94. $unc_len = strlen($data);
  95. $crc = crc32($data);
  96. $zdata = gzcompress($data);
  97. $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
  98. $c_len = strlen($zdata);
  99. $fr .= pack('V', $crc); // crc32
  100. $fr .= pack('V', $c_len); // compressed filesize
  101. $fr .= pack('V', $unc_len); // uncompressed filesize
  102. $fr .= pack('v', strlen($name)); // length of filename
  103. $fr .= pack('v', 0); // extra field length
  104. $fr .= $name;
  106. // "file data" segment
  107. $fr .= $zdata;
  109. // "data descriptor" segment (optional but necessary if archive is not
  110. // served as file)
  111. $fr .= pack('V', $crc); // crc32
  112. $fr .= pack('V', $c_len); // compressed filesize
  113. $fr .= pack('V', $unc_len); // uncompressed filesize
  115. // add this entry to array
  116. $this -> datasec[] = $fr;
  118. // now add to central directory record
  119. $cdrec = "\x50\x4b\x01\x02";
  120. $cdrec .= "\x00\x00"; // version made by
  121. $cdrec .= "\x14\x00"; // version needed to extract
  122. $cdrec .= "\x00\x00"; // gen purpose bit flag
  123. $cdrec .= "\x08\x00"; // compression method
  124. $cdrec .= $hexdtime; // last mod time & date
  125. $cdrec .= pack('V', $crc); // crc32
  126. $cdrec .= pack('V', $c_len); // compressed filesize
  127. $cdrec .= pack('V', $unc_len); // uncompressed filesize
  128. $cdrec .= pack('v', strlen($name) ); // length of filename
  129. $cdrec .= pack('v', 0 ); // extra field length
  130. $cdrec .= pack('v', 0 ); // file comment length
  131. $cdrec .= pack('v', 0 ); // disk number start
  132. $cdrec .= pack('v', 0 ); // internal file attributes
  133. $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
  135. $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
  136. $this -> old_offset += strlen($fr);
  138. $cdrec .= $name;
  140. // optional extra field, file comment goes here
  141. // save to central directory
  142. $this -> ctrl_dir[] = $cdrec;
  143. } // end of the 'addFile()' method
  146. /**
  147. * Dumps out file
  148. *
  149. * @return string the zipped file
  150. *
  151. * @access public
  152. */
  153. function file()
  154. {
  155. $data = implode('', $this -> datasec);
  156. $ctrldir = implode('', $this -> ctrl_dir);
  158. return
  159. $data .
  160. $ctrldir .
  161. $this -> eof_ctrl_dir .
  162. pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
  163. pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
  164. pack('V', strlen($ctrldir)) . // size of central dir
  165. pack('V', strlen($data)) . // offset to start of central dir
  166. "\x00\x00"; // .zip file comment length
  167. } // end of the 'file()' method
  170. /**
  171. * A Wrapper of original addFile Function
  172. *
  173. * Created By Hasin Hayder at 29th Jan, 1:29 AM
  174. *
  175. * @param array An Array of files with relative/absolute path to be added in Zip File
  176. *
  177. * @access public
  178. */
  179. function addFiles($files /*Only Pass Array*/)
  180. {
  181. foreach($files as $file)
  182. {
  183. if (is_file($file)) //directory check
  184. {
  185. $data = implode("",file($file));
  186. $this->addFile($data,$file);
  187. }
  188. }
  189. }
  191. /**
  192. * A Wrapper of original file Function
  193. *
  194. * Created By Hasin Hayder at 29th Jan, 1:29 AM
  195. *
  196. * @param string Output file name
  197. *
  198. * @access public
  199. */
  200. function output($file)
  201. {
  202. $fp=fopen($file,"w");
  203. fwrite($fp,$this->file());
  204. fclose($fp);
  205. }
  206. } // end of the 'zipfile' class

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