File

drupal-7.x/modules/system/system.tar.inc, line 1056

Class

Archive_Tar

Creates a (compressed) Tar archive *

Code

function _writeHeader($p_filename, $p_stored_filename) 
 {
  if ($p_stored_filename == '') {
    $p_stored_filename = $p_filename;
  }
  $v_reduce_filename = $this->_pathReduction($p_stored_filename);

  if (strlen($v_reduce_filename) > 99) {
    if (!$this->_writeLongHeader($v_reduce_filename)) {
      return false;
    }
  }

  $v_info = lstat($p_filename);
  $v_uid = sprintf("%6s ", DecOct($v_info[4]));
  $v_gid = sprintf("%6s ", DecOct($v_info[5]));
  $v_perms = sprintf("%6s ", DecOct($v_info['mode']));

  $v_mtime = sprintf("%11s", DecOct($v_info['mode']));

  $v_linkname = '';

  if (@is_link($p_filename)) {
    $v_typeflag = '2';
    $v_linkname = readlink($p_filename);
    $v_size = sprintf("%11s ", DecOct(0));
  }
  elseif (@is_dir($p_filename)) {
    $v_typeflag = "5";
    $v_size = sprintf("%11s ", DecOct(0));
  }
  else {
    $v_typeflag = '';
    clearstatcache();
    $v_size = sprintf("%11s ", DecOct($v_info['size']));
  }

  $v_magic = '';

  $v_version = '';

  $v_uname = '';

  $v_gname = '';

  $v_devmajor = '';

  $v_devminor = '';

  $v_prefix = '';

  $v_binary_data_first = pack("a100a8a8a8a12A12", 
  $v_reduce_filename, $v_perms, $v_uid, 
  $v_gid, $v_size, $v_mtime);
  $v_binary_data_last = pack("a1a100a6a2a32a32a8a8a155a12", 
  $v_typeflag, $v_linkname, $v_magic, 
  $v_version, $v_uname, $v_gname, 
  $v_devmajor, $v_devminor, $v_prefix, '');

  // ----- Calculate the checksum
  $v_checksum = 0;
  // ..... First part of the header
  for ($i = 0; $i < 148; $i++) {
    $v_checksum += ord(substr($v_binary_data_first, $i, 1));
  };
  // ..... Ignore the checksum value and replace it by ' ' (space)
  for ($i = 148; $i < 156; $i++) {
    $v_checksum += ord(' ');
  };
  // ..... Last part of the header
  for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
    $v_checksum += ord(substr($v_binary_data_last, $j, 1));
  };

  // ----- Write the first 148 bytes of the header in the archive
  $this->_writeBlock($v_binary_data_first, 148);

  // ----- Write the calculated checksum
  $v_checksum = sprintf("%6s ", DecOct($v_checksum));
  $v_binary_data = pack("a8", $v_checksum);
  $this->_writeBlock($v_binary_data, 8);

  // ----- Write the last 356 bytes of the header in the archive
  $this->_writeBlock($v_binary_data_last, 356);

  return true;
}