// EBCDIC -> ASCII conversion table:
	BYTE $0x00; BYTE $0x01; BYTE $0x02; BYTE $0x03
	BYTE $0x9c; BYTE $0x09; BYTE $0x86; BYTE $0x7f
	BYTE $0x97; BYTE $0x8d; BYTE $0x8e; BYTE $0x0b
	BYTE $0x0c; BYTE $0x0d; BYTE $0x0e; BYTE $0x0f
	BYTE $0x10; BYTE $0x11; BYTE $0x12; BYTE $0x13
	BYTE $0x9d; BYTE $0x0a; BYTE $0x08; BYTE $0x87
	BYTE $0x18; BYTE $0x19; BYTE $0x92; BYTE $0x8f

	msg := []byte{
		0x85, 0x9e, 0xef, 0x2f, 0xd7, 0x8a, 0xca, 0x00, 0x30, 0x8b,
		0xdc, 0x47, 0x11, 0x93, 0xbf, 0x55, 0xbf, 0x9d, 0x78, 0xdb,
		0x8f, 0x8a, 0x67, 0x2b, 0x48, 0x46, 0x34, 0xf3, 0xc9, 0xc2,
		0x6e, 0x64, 0x78, 0xae, 0x10, 0x26, 0x0f, 0xe0, 0xdd, 0x8c,
		0x08, 0x2e, 0x53, 0xa5, 0x29, 0x3a, 0xf2, 0x17, 0x3c, 0xd5,
		0x0c, 0x6d, 0x5d, 0x35, 0x4f, 0xeb, 0xf7, 0x8b, 0x26, 0x02,
		0x1c, 0x25, 0xc0, 0x27, 0x12, 0xe7, 0x8c, 0xd4, 0x69, 0x4c,

	// It is stored here in order for Reset() to be able to put context into
	// initial state.
	initBlock []byte
}

// Consts for configuring initial SHA-3 state
const (
	dsbyteShake  = 0x1f
	dsbyteCShake = 0x04
	rate128      = 168
	rate256      = 136
)

func bytepad(input []byte, w int) []byte {
	// leftEncode always returns max 9 bytes
	buf := make([]byte, 0, 9+len(input)+w)

	// of the rate, which involves adding a "1" bit, zero or more "0" bits, and
	// a final "1" bit. We merge the first "1" bit from the padding into dsbyte,
	// giving 00000110b (0x06) and 00011111b (0x1f).
	// [1] http://csrc.nist.gov/publications/drafts/fips-202/fips_202_draft.pdf
	//     "Draft FIPS 202: SHA-3 Standard: Permutation-Based Hash and
	//      Extendable-Output Functions (May 2014)"
	dsbyte byte

            this.delegate = delegate;
        }

        @Override
        public void write(int b) throws IOException {
            delegate.write(HEX_DIGIT[(b >> 4) & 0x0f]);
            delegate.write(HEX_DIGIT[b & 0x0f]);
        }

        @Override
        public void flush() throws IOException {
            delegate.flush();
        }

        @Override

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package unix

const (
	AT_EACCESS          = 0x10
	AT_FDCWD            = -0x2
	AT_REMOVEDIR        = 0x80
	AT_SYMLINK_NOFOLLOW = 0x0020

	UTIME_OMIT = -0x2

		b := reverseHexTable[q]
		if a > 0x0f {
			return i, InvalidByteError(p)
		}
		if b > 0x0f {
			return i, InvalidByteError(q)
		}
		dst[i] = (a << 4) | b
		i++
	}
	if len(src)%2 == 1 {
		// Check for invalid char before reporting bad length,
		// since the invalid char (if present) is an earlier problem.
		if reverseHexTable[src[j-1]] > 0x0f {
			return i, InvalidByteError(src[j-1])
		}

type OpenHow struct {
	Flags   uint64
	Mode    uint64
	Resolve uint64
}

const SizeofOpenHow = 0x18

const (
	RESOLVE_CACHED        = 0x20
	RESOLVE_BENEATH       = 0x8
	RESOLVE_IN_ROOT       = 0x10
	RESOLVE_NO_MAGICLINKS = 0x2
	RESOLVE_NO_SYMLINKS   = 0x4
	RESOLVE_NO_XDEV       = 0x1
)

type Siginfo struct {
	Signo int32
	Errno int32
	Code  int32
	Pid   int32
	Uid   uint32

		addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
	}
	return n, addr, err
}

func stripIPv4Header(n int, b []byte) int {
	if len(b) < 20 {
		return n
	}
	l := int(b[0]&0x0f) << 2
	if 20 > l || l > len(b) {
		return n
	}
	if b[0]>>4 != 4 {
		return n
	}
	copy(b, b[l:])
	return n - l
}

func (c *IPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {

	// GZIP stores Latin-1 strings; error if non-Latin-1; convert if non-ASCII.
	needconv := false
	for _, v := range s {
		if v == 0 || v > 0xff {
			return errors.New("gzip.Write: non-Latin-1 header string")
		}
		if v > 0x7f {
			needconv = true
		}
	}
	if needconv {
		b := make([]byte, 0, len(s))
		for _, v := range s {
			b = append(b, byte(v))
		}
		_, err = z.w.Write(b)