int n;
        if ( ( n = readn(in, buffer, bufferIndex, HEADER_LENGTH) ) != HEADER_LENGTH ) {
            if ( n == -1 ) {
                return -1;
            }
            throw new IOException("unexpected EOF reading netbios session header");
        }
        int t = buffer[ bufferIndex ] & 0xFF;
        return t;
    }

    int type, length;

                                    throws IOException {
        int n;
        if(( n = readn( in, buffer, bufferIndex, HEADER_LENGTH )) != HEADER_LENGTH ) {
            if( n == -1 ) {
                return -1;
            }
            throw new IOException( "unexpected EOF reading netbios session header" );
        }
        int t = buffer[bufferIndex] & 0xFF;
        return t;
    }

    int type, length;