function Archive_Tar::_writeLongHeader

Parameters

string $p_filename:

Return value

bool

File

modules/system/system.tar.inc, line 1659

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_magic = 'ustar ';
    $v_version = ' ';
    $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
    $v_checksum = sprintf("%06s\x00 ", DecOct($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;
}