mask1b := byte(int8(t) >> 7) // mask1b is 0xFF iff one block is enough

	separator := byte(0x80) // gets reset to 0x00 once used
	for i := byte(0); i < chunk; i++ {
		mask := byte(int8(i-nx) >> 7) // 0x00 after the end of data

		// if we reached the end of the data, replace with 0x80 or 0x00
		d.x[i] = (^mask & separator) | (mask & d.x[i])

		// zero the separator once used
		separator &= mask

	BPX4PTR = 320  // ptrace
)

const (
	//options
	//byte1
	BPX_OPNFHIGH = 0x80
	//byte2
	BPX_OPNFEXEC = 0x80
	//byte3
	BPX_O_NOLARGEFILE = 0x08
	BPX_O_LARGEFILE   = 0x04
	BPX_O_ASYNCSIG    = 0x02
	BPX_O_SYNC        = 0x01
	//byte4
	BPX_O_CREXCL   = 0xc0
	BPX_O_CREAT    = 0x80
	BPX_O_EXCL     = 0x40
	BPX_O_NOCTTY   = 0x20
	BPX_O_TRUNC    = 0x10
	BPX_O_APPEND   = 0x08

	TIOCM_CAR                        = 0x40
	TIOCM_CD                         = 0x40
	TIOCM_CTS                        = 0x20
	TIOCM_DSR                        = 0x100
	TIOCM_RI                         = 0x80
	TIOCM_RNG                        = 0x80
	TIOCM_SR                         = 0x10
	TIOCM_ST                         = 0x8
	TIOCNOTTY                        = 0x5422
	TIOCNXCL                         = 0x540d

	TIOCM_CAR                        = 0x40
	TIOCM_CD                         = 0x40
	TIOCM_CTS                        = 0x20
	TIOCM_DSR                        = 0x100
	TIOCM_RI                         = 0x80
	TIOCM_RNG                        = 0x80
	TIOCM_SR                         = 0x10
	TIOCM_ST                         = 0x8
	TIOCNOTTY                        = 0x5422
	TIOCNXCL                         = 0x540d

	return append(in, hash[:]...)
}

func (d *digest) checkSum() [Size]byte {
	// Append 0x80 to the end of the message and then append zeros
	// until the length is a multiple of 56 bytes. Finally append
	// 8 bytes representing the message length in bits.
	//
	// 1 byte end marker :: 0-63 padding bytes :: 8 byte length
	tmp := [1 + 63 + 8]byte{0x80}
	pad := (55 - d.len) % 64                     // calculate number of padding bytes

	_CLD_KILLED          = 2
	_CLD_DUMPED          = 3
	_CLD_TRAPPED         = 4
	_CLD_STOPPED         = 5
	_CLD_CONTINUED       = 6

	// These are the same as in syscall/syscall_linux.go.
	core      = 0x80
	stopped   = 0x7f
	continued = 0xffff
)

// WaitStatus converts SiginfoChild, as filled in by the waitid syscall,
// to syscall.WaitStatus.
func (s *SiginfoChild) WaitStatus() (ws syscall.WaitStatus) {

        long _4000_bytes = 4000L;
        long _8000_bytes = 2L * _4000_bytes;
        long _50_kilobytes = 50000L;
        assertEquals("0/8.0 kB", format.formatProgress(_0_bytes, _8000_bytes));
        assertEquals("0.4/8.0 kB", format.formatProgress(_400_bytes, _8000_bytes));
        assertEquals("4.0/8.0 kB", format.formatProgress(_4000_bytes, _8000_bytes));

000000b0  c5 aa 8d 7d f2 ef f3 40  22 9d db d3 83 49 45 94  |...}...@"....IE.|
000000c0  96 c6 85 74 ac f1 64 e2  80 7a 47 1e c1 f7 45 bb  |...t..d..zG...E.|
000000d0  6e 56 b5 5b 90 1f 11 6e  47 d5 52 b7 5d d3 02 80  |nV.[...nG.R.]...|
000000e0  55 59 94 53 05 ab 5c aa  18 f8 7d d0 24 1d 6f 7a  |UY.S..\...}.$.oz|
000000f0  c7 8e e9 80 61 dc b3 2b  c0 74 09 d3 58 be e9 cb  |....a..+.t..X...|

	Fd     int32
	Pad    int32
}

const (
	OPEN_TREE_CLOEXEC = 0x80000
)

const (
	POLLRDHUP = 0x2000
)

type Sigset_t struct {
	Val [16]uint64
}

const _C__NSIG = 0x80

const (
	SIG_BLOCK   = 0x1
	SIG_UNBLOCK = 0x2
	SIG_SETMASK = 0x3
)

type Siginfo struct {
	Signo int32
	Code  int32
	Errno int32
	_     int32
	_     [112]byte
}

	Fd     int32
	Pad    int32
}

const (
	OPEN_TREE_CLOEXEC = 0x80000
)

const (
	POLLRDHUP = 0x2000
)

type Sigset_t struct {
	Val [32]uint32
}

const _C__NSIG = 0x80

const (
	SIG_BLOCK   = 0x1
	SIG_UNBLOCK = 0x2
	SIG_SETMASK = 0x3
)

type Siginfo struct {
	Signo int32
	Code  int32
	Errno int32
	_     [116]byte
}

type Termios struct {