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));

	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
}

	TIOCM_LOOP                       = 0x8000
	TIOCM_OUT1                       = 0x2000
	TIOCM_OUT2                       = 0x4000
	TIOCM_RI                         = 0x80
	TIOCM_RNG                        = 0x80
	TIOCM_SR                         = 0x10
	TIOCM_ST                         = 0x8
	TIOCNOTTY                        = 0x5422
	TIOCNXCL                         = 0x540d

	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 {

	// 0x80, Cr: 0x80} and c1 := Gray{Y: y} then c0.RGBA() should equal
	// c1.RGBA(). Specifically, if y == 0 then "R = etc >> 8" should yield
	// 0x0000 and if y == 0xff then "R = etc >> 8" should yield 0xffff. If we
	// used a constant rounding adjustment of 1<<15, then it would yield 0x0080
	// and 0xff80 respectively.
	//
	// Note that when cb == 0x80 and cr == 0x80 then the formulae collapse to:
	//	R = YY1 >> n

			bytes[i] ^= 0xff
		}
		if len(bytes) == 0 || bytes[0]&0x80 == 0 {
			return multiEncoder([]encoder{byteFFEncoder, bytesEncoder(bytes)}), nil
		}
		return bytesEncoder(bytes), nil
	} else if n.Sign() == 0 {
		// Zero is written as a single 0 zero rather than no bytes.
		return byte00Encoder, nil
	} else {
		bytes := n.Bytes()
		if len(bytes) > 0 && bytes[0]&0x80 != 0 {
			// We'll have to pad this with 0x00 in order to stop it

00000280  ac 5f bb 29 07 30 ff f6  84 af c4 cf c2 ed 90 99  |._.).0..........|
00000290  5f 58 cb 3b 74 16 03 03  00 88 0f 00 00 84 08 04  |_X.;t...........|
000002a0  00 80 2e 4c af b1 f2 9c  de 14 92 81 c4 7d d1 2f  |...L.........}./|
000002b0  a3 ba ba df 6f 26 da 2d  86 b4 1f 60 cd fe e7 c1  |....o&.-...`....|
000002c0  77 02 a5 58 3f 6a fc 1d  ef 93 23 0a 9c c9 70 93  |w..X?j....#...p.|

	AT_REMOVEDIR        = 0x80
	AT_SYMLINK_FOLLOW   = 0x40
	AT_SYMLINK_NOFOLLOW = 0x20
	AT_EACCESS          = 0x10
)

type PollFd struct {
	Fd      int32
	Events  int16
	Revents int16
}

const (
	POLLERR    = 0x8
	POLLHUP    = 0x10
	POLLIN     = 0x1
	POLLNVAL   = 0x20
	POLLOUT    = 0x4
	POLLPRI    = 0x2
	POLLRDBAND = 0x80
	POLLRDNORM = 0x40
	POLLWRBAND = 0x100

	S_IFDIR  = 0x4000
	S_IFBLK  = 0x6000
	S_IFREG  = 0x8000
	S_IFLNK  = 0xa000
	S_IFSOCK = 0xc000
	S_ISUID  = 0x800
	S_ISGID  = 0x400
	S_ISVTX  = 0x200
	S_IRUSR  = 0x100
	S_IWRITE = 0x80
	S_IWUSR  = 0x80
	S_IXUSR  = 0x40
)

const (
	FILE_TYPE_CHAR    = 0x0002
	FILE_TYPE_DISK    = 0x0001
	FILE_TYPE_PIPE    = 0x0003
	FILE_TYPE_REMOTE  = 0x8000
	FILE_TYPE_UNKNOWN = 0x0000
)

  private UnsignedBytes() {}

  /**
   * The largest power of two that can be represented as an unsigned {@code byte}.
   *
   * @since 10.0
   */
  public static final byte MAX_POWER_OF_TWO = (byte) 0x80;

  /**
   * The largest value that fits into an unsigned byte.
   *
   * @since 13.0
   */
  public static final byte MAX_VALUE = (byte) 0xFF;

  private static final int UNSIGNED_MASK = 0xFF;

  /**