check            4141 lib/pdf/xpdf/Stream.cc   int check;
check            4170 lib/pdf/xpdf/Stream.cc     check = c & 0xff;
check            4173 lib/pdf/xpdf/Stream.cc     check |= (c & 0xff) << 8;
check            4174 lib/pdf/xpdf/Stream.cc     if (check != (~blockLen & 0xffff))