PHP packages a group of files as a ZIP archive class

Source: Internet
Author: User
Tags bit set crc32 time and date
  1. /**
  2. * Zip file Creation class.
  3. * Makes zip files.
  4. *
  5. * @access Public
  6. */
  7. Class ZipFile
  8. {
  9. /**
  10. * Array to store compressed data
  11. *
  12. * @public Array $datasec
  13. */
  14. Public $datasec = Array ();
  15. /**
  16. * Central Directory
  17. *
  18. * @public Array $ctrl _dir
  19. */
  20. Public $ctrl _dir = Array ();
  21. /**
  22. * End of Central directory record
  23. *
  24. * @public string $eof _ctrl_dir
  25. */
  26. Public $eof _ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
  27. /**
  28. * Last offset position
  29. *
  30. * @public integer $old _offset
  31. */
  32. Public $old _offset = 0;
  33. /**
  34. * Converts a Unix timestamp to a four byte DOS date and time format (date
  35. * In high and bytes, time in low, bytes allowing magnitude comparison).
  36. *
  37. * @param integer The current Unix timestamp
  38. *
  39. * @return Integer The current date in a four byte DOS format
  40. *
  41. * @access Private
  42. */
  43. function Unix2dostime ($unixtime = 0) {
  44. $timearray = ($unixtime = = 0)? GETDATE (): getdate ($unixtime);
  45. if ($timearray [' Year '] < 1980) {
  46. $timearray [' year '] = 1980;
  47. $timearray [' mon '] = 1;
  48. $timearray [' mday '] = 1;
  49. $timearray [' hours '] = 0;
  50. $timearray [' minutes '] = 0;
  51. $timearray [' seconds '] = 0;
  52. }//End If
  53. Return (($timearray [' Year ']-1980) << 25) | ($timearray [' mon '] << 21) | ($timearray [' Mday '] << 16) |
  54. ($timearray [' hours '] << 11) | ($timearray [' minutes '] << 5) | ($timearray [' seconds '] >> 1);
  55. }//End of the ' unix2dostime () ' method
  56. /**
  57. * Adds "file" to archive
  58. *
  59. * @param string file contents
  60. * @param string name of the the file in the archive (may contains the path)
  61. * @param integer The current timestamp
  62. *
  63. * @access Public
  64. */
  65. function AddFile ($data, $name, $time = 0)
  66. {
  67. $name = str_replace (' \ \ ', '/', $name);
  68. $dtime = Dechex ($this->unix2dostime ($time));
  69. $hexdtime = ' \x '. $dtime [6]. $dtime [7]
  70. . ' \x '. $dtime [4]. $dtime [5]
  71. . ' \x '. $dtime [2]. $dtime [3]
  72. . ' \x '. $dtime [0]. $dtime [1];
  73. Eval (' $hexdtime = '. $hexdtime. '";');
  74. $FR = "\x50\x4b\x03\x04";
  75. $fr. = "\x14\x00"; Ver needed to extract
  76. $fr. = "\x00\x00"; Gen Purpose bit Flag
  77. $fr. = "\x08\x00"; Compression method
  78. $fr. = $hexdtime; Last mod time and date
  79. "Local File Header" segment
  80. $unc _len = strlen ($data);
  81. $CRC = CRC32 ($data);
  82. $zdata = gzcompress ($data);
  83. $zdata = substr (substr ($zdata, 0, strlen ($zdata)-4), 2); Fix CRC Bug
  84. $c _len = strlen ($zdata);
  85. $fr. = Pack (' V ', $CRC); Crc32
  86. $fr. = Pack (' V ', $c _len); Compressed FileSize
  87. $fr. = Pack (' V ', $unc _len); Uncompressed FileSize
  88. $fr. = Pack (' V ', strlen ($name)); Length of filename
  89. $fr. = Pack (' V ', 0); Extra field length
  90. $fr. = $name;
  91. "File Data" segment
  92. $fr. = $zdata;
  93. "Data Descriptor" segment (optional but necessary if archive are not
  94. served as file)
  95. $fr. = Pack (' V ', $CRC); Crc32
  96. $fr. = Pack (' V ', $c _len); Compressed FileSize
  97. $fr. = Pack (' V ', $unc _len); Uncompressed FileSize
  98. Add this entry to array
  99. $this-datasec[] = $FR;
  100. Now add to Central directory record
  101. $cdrec = "\x50\x4b\x01\x02";
  102. $cdrec. = "\x00\x00"; Version made by
  103. $cdrec. = "\x14\x00"; Version needed to extract
  104. $cdrec. = "\x00\x00"; Gen Purpose bit Flag
  105. $cdrec. = "\x08\x00"; Compression method
  106. $cdrec. = $hexdtime; Last MoD time & date
  107. $cdrec. = Pack (' V ', $CRC); Crc32
  108. $cdrec. = Pack (' V ', $c _len); Compressed FileSize
  109. $cdrec. = Pack (' V ', $unc _len); Uncompressed FileSize
  110. $cdrec. = Pack (' V ', strlen ($name)); Length of filename
  111. $cdrec. = Pack (' V ', 0); Extra field length
  112. $cdrec. = Pack (' V ', 0); File Comment length
  113. $cdrec. = Pack (' V ', 0); Disk number Start
  114. $cdrec. = Pack (' V ', 0); Internal file attributes
  115. $cdrec. = Pack (' V ', 32); External file attributes-' archive ' bit set
  116. $cdrec. = Pack (' V ', $this-old_offset); Relative offset of local header
  117. $this-Old_offset + = strlen ($FR);
  118. $cdrec. = $name;
  119. Optional extra field, file comment goes here
  120. Save to Central directory
  121. $this-ctrl_dir[] = $cdrec;
  122. }//End of the ' AddFile () ' method
  123. /**
  124. * Dumps out file
  125. *
  126. * @return String The zipped file
  127. *
  128. * @access Public
  129. */
  130. function file ()
  131. {
  132. $data = Implode (", $this-datasec);
  133. $ctrldir = Implode (", $this-Ctrl_dir);
  134. Return
  135. $data.
  136. $ctrldir.
  137. Eof_ctrl_dir, $this.
  138. Pack (' V ', sizeof ($this-Ctrl_dir)). Total # of Entries "on this disk"
  139. Pack (' V ', sizeof ($this-Ctrl_dir)). Total # of entries overall
  140. Pack (' V ', strlen ($ctrldir)). Size of Central Dir
  141. Pack (' V ', strlen ($data)). Offset to start of the central Dir
  142. "\x00\x00"; . zip file Comment length
  143. }//end of the ' file () ' method
  144. /**
  145. * A Wrapper of original AddFile Function
  146. *
  147. * Created by Hasin Hayder at 29th Jan, 1:29 AM
  148. *
  149. * @param array An array of files with Relative/absolute path to being added in Zip File
  150. *
  151. * @access Public
  152. */
  153. function AddFiles ($files/*only Pass array*/)
  154. {
  155. foreach ($files as $file)
  156. {
  157. if (Is_file ($file))//directory check
  158. {
  159. $data = Implode ("", File ($file));
  160. $this->addfile ($data, $file);
  161. }
  162. }
  163. }
  164. /**
  165. * A Wrapper of original file Function
  166. *
  167. * Created by Hasin Hayder at 29th Jan, 1:29 AM
  168. *
  169. * @param string Output file name
  170. *
  171. * @access Public
  172. */
  173. function output ($file)
  174. {
  175. $FP =fopen ($file, "w");
  176. Fwrite ($fp, $this->file ());
  177. Fclose ($FP);
  178. }
  179. }//End of the ' ZipFile ' class
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