public function Archive_Tar::_writeLongHeader

Parameters

string $p_filename:

Return value

bool:

File

modules/system/system.tar.inc, line 1649

Class

Archive_Tar

Code

public function _writeLongHeader($p_filename, $is_link = false) 
 {
  $v_uid = sprintf("%07s", 0);
  $v_gid = sprintf("%07s", 0);
  $v_perms = sprintf("%07s", 0);
  $v_size = sprintf("%'011s", DecOct(strlen($p_filename)));
  $v_mtime = sprintf("%011s", 0);
  $v_typeflag = ($is_link ? 'K' : 'L');
  $v_linkname = '';
  $v_uname = '';
  $v_gname = '';
  $v_devmajor = '';
  $v_devminor = '';
  $v_prefix = '';

  $v_binary_data_first = pack(
  "a100a8a8a8a12a12", 
  '././@LongLink', 
  $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
  $v_checksum = sprintf("%06s\0 ", DecOct($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);

  // ----- Write the filename as content of the block
  $i = 0;
  while (($v_buffer = substr($p_filename, (($i++) * 512), 512)) != '') {
    $v_binary_data = pack("a512", "$v_buffer");
    $this->_writeBlock($v_binary_data);
  }

  return true;
}