public function Archive_Tar::_writeHeaderBlock

Parameters

string $p_filename:

int $p_size:

int $p_mtime:

int $p_perms:

string $p_type:

int $p_uid:

int $p_gid:

Return value

bool:

File

core/modules/system/system.tar.inc, line 1549

Class

Archive_Tar

Code

public function _writeHeaderBlock(
$p_filename, 
$p_size, 
$p_mtime = 0, 
$p_perms = 0, 
$p_type = '', 
$p_uid = 0, 
$p_gid = 0
) 
 {
  $p_filename = $this->_pathReduction($p_filename);

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

  if ($p_type == "5") {
    $v_size = sprintf("%011s", DecOct(0));
  }
  else {
    $v_size = sprintf("%011s", DecOct($p_size));
  }

  $v_uid = sprintf("%07s", DecOct($p_uid));
  $v_gid = sprintf("%07s", DecOct($p_gid));
  $v_perms = sprintf("%07s", DecOct($p_perms & 000777));

  $v_mtime = sprintf("%11s", DecOct($p_mtime));

  $v_linkname = '';

  $v_magic = 'ustar ';

  $v_version = ' ';

  if (function_exists('posix_getpwuid')) {
    $userinfo = posix_getpwuid($p_uid);
    $groupinfo = posix_getgrgid($p_gid);

    if ($userinfo === false || $groupinfo === false) {
      $v_uname = '';
      $v_gname = '';
    }
    else {
      $v_uname = $userinfo['name'];
      $v_gname = $groupinfo['name'];
    }
  }
  else {
    $v_uname = '';
    $v_gname = '';
  }

  $v_devmajor = '';
  $v_devminor = '';
  $v_prefix = '';

  $v_binary_data_first = pack(
  "a100a8a8a8a12A12", 
  $p_filename, 
  $v_perms, 
  $v_uid, 
  $v_gid, 
  $v_size, 
  $v_mtime
  );
  $v_binary_data_last = pack(
  "a1a100a6a2a32a32a8a8a155a12", 
  $p_type, 
  $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);

  return true;
}