function ArchiveTar::_writeHeader

File

drupal/core/lib/Drupal/Component/Archiver/ArchiveTar.php, line 1060

Class

ArchiveTar

Creates a (compressed) Tar archive

Namespace

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(TRUE, $p_filename);
    $v_size = sprintf("%11s ", DecOct($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;
}