public function Archive_Tar::_writeLongHeader

Parameters

string $p_filename:

Return value

bool

File

drupal/modules/system/system.tar.inc, line 1618

Class

Archive_Tar

Code

public function _writeLongHeader($p_filename) {
  $v_size = sprintf("%11s ", DecOct(strlen($p_filename)));
  $v_typeflag = 'L';
  $v_linkname = '';
  $v_magic = '';
  $v_version = '';
  $v_uname = '';
  $v_gname = '';
  $v_devmajor = '';
  $v_devminor = '';
  $v_prefix = '';
  $v_binary_data_first = pack("a100a8a8a8a12a12", '././@LongLink', 0, 0, 0, $v_size, 0);
  $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
  $v_checksum = sprintf("%06s ", DecOct($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;
}