public function Archive_Tar::_writeHeader

Parameters

string $p_filename:

string $p_stored_filename:

Return value

bool:

File

core/modules/system/system.tar.inc, line 1420

Class

Archive_Tar

Code

public function _writeHeader($p_filename, $p_stored_filename) 
 {
  if ($p_stored_filename == '') {
    $p_stored_filename = $p_filename;
  }

  $v_reduced_filename = $this->_pathReduction($p_stored_filename);

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

  $v_linkname = '';
  if (@is_link($p_filename)) {
    $v_linkname = readlink($p_filename);
  }

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

  $v_info = lstat($p_filename);
  $v_uid = sprintf("%07s", DecOct($v_info[4]));
  $v_gid = sprintf("%07s", DecOct($v_info[5]));
  $v_perms = sprintf("%07s", DecOct($v_info['mode'] & 000777));
  $v_mtime = sprintf("%011s", DecOct($v_info['mtime']));

  if (@is_link($p_filename)) {
    $v_typeflag = '2';
    $v_size = sprintf("%011s", DecOct(0));
  }
  elseif (@is_dir($p_filename)) {
    $v_typeflag = "5";
    $v_size = sprintf("%011s", DecOct(0));
  }
  else {
    $v_typeflag = '0';
    clearstatcache();
    $v_size = sprintf("%011s", DecOct($v_info['size']));
  }

  $v_magic = 'ustar ';
  $v_version = ' ';
  $v_uname = '';
  $v_gname = '';

  if (function_exists('posix_getpwuid')) {
    $userinfo = posix_getpwuid($v_info[4]);
    $groupinfo = posix_getgrgid($v_info[5]);

    if (isset($userinfo['name'])) {
      $v_uname = $userinfo['name'];
    }

    if (isset($groupinfo['name'])) {
      $v_gname = $groupinfo['name'];
    }
  }

  $v_devmajor = '';

  $v_devminor = '';

  $v_prefix = '';

  $v_binary_data_first = pack(
  "a100a8a8a8a12a12", 
  $v_reduced_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
  $v_checksum = sprintf("%06s\0 ", DecOct($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);

  return true;
}