iovecs := bytes2iovec(iovs)
	n, err = readv(fd, iovecs)
	return n, err
}

//sys	preadv(fd int, iovs []Iovec, off int64) (n int, err error)

func Preadv(fd int, iovs [][]byte, off int64) (n int, err error) {
	iovecs := bytes2iovec(iovs)
	n, err = preadv(fd, iovecs, off)
	return n, err
}

//sys	writev(fd int, iovs []Iovec) (n int, err error)

func Writev(fd int, iovs [][]byte) (n int, err error) {

        offset,
        remaining,
        off;
    private byte[] b;

    SmbComWrite() {
        super();
        command = SMB_COM_WRITE;
    }
    SmbComWrite( int fid, int offset, int remaining, byte[] b, int off, int len ) {
        this.fid = fid;
        this.count = len;
        this.offset = offset;
        this.remaining = remaining;
        this.b = b;
        this.off = off;
        command = SMB_COM_WRITE;
    }

	for off := uintptr(0); off < 3<<30; off += 65536 {
		_, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
			base+off, 65536, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FIXED, tmp.Fd(), 0)
		if errno != 0 {
			t.Skipf("could not map a page at requested 0x%x: %s", base+off, errno)
		}
		defer syscall.Syscall(syscall.SYS_MUNMAP, base+off, 65536, 0)
	}

	}
	return off
}

func (r *Reader) Offset() int64 {
	off, err := r.f.Seek(0, 1)
	if err != nil {
		log.Fatalf("seeking in output [0, 1]: %v", err)
	}
	off -= int64(r.Buffered())
	return off
}

func (w *Writer) Offset() int64 {
	if err := w.Flush(); err != nil {
		log.Fatalf("writing output: %v", err)
	}
	off, err := w.f.Seek(0, 1)
	if err != nil {
		log.Fatalf("seeking in output [0, 1]: %v", err)
	}

            bufferIndex += 14;
            e.type = readInt2( buffer, bufferIndex );
            bufferIndex += 2;
            int off = readInt4( buffer, bufferIndex );
            bufferIndex += 4;
            off = ( off & 0xFFFF ) - converter;
            off = start + off;
            e.remark = readString( buffer, off, 128, false );

            if (log.level >= 4)
                log.println( e );
        }

// Returns the offset code corresponding to a specific offset.
func offsetCode(off uint32) uint32 {
	if off < uint32(len(offsetCodes)) {
		return offsetCodes[off]
	}
	if off>>7 < uint32(len(offsetCodes)) {
		return offsetCodes[off>>7] + 14
	}
	return offsetCodes[off>>14] + 28

            e.type = SMBUtil.readInt2(buffer, bufferIndex);
            bufferIndex += 2;
            int off = SMBUtil.readInt4(buffer, bufferIndex);
            bufferIndex += 4;
            off = ( off & 0xFFFF ) - this.converter;
            off = start + off;
            e.remark = readString(buffer, off, 128, false);

            if ( log.isTraceEnabled() ) {
                log.trace(e.toString());
            }

	r := strings.NewReader("0123456789")
	tests := []struct {
		off     int64
		seek    int
		n       int
		want    string
		wantpos int64
		readerr error
		seekerr string
	}{
		{seek: io.SeekStart, off: 0, n: 20, want: "0123456789"},
		{seek: io.SeekStart, off: 1, n: 1, want: "1"},
		{seek: io.SeekCurrent, off: 1, wantpos: 3, n: 2, want: "34"},
		{seek: io.SeekStart, off: -1, seekerr: "strings.Reader.Seek: negative position"},

  protected void update(byte[] b) {
    update(b, 0, b.length);
  }

  /** Updates this hasher with {@code len} bytes starting at {@code off} in the given buffer. */
  protected void update(byte[] b, int off, int len) {
    for (int i = off; i < off + len; i++) {
      update(b[i]);
    }
  }

  /** Updates this hasher with bytes from the given buffer. */
  protected void update(ByteBuffer b) {

	return 0
}

func makeBuf(d *Data, format dataFormat, name string, off Offset, data []byte) buf {
	return buf{d, d.order, format, name, off, data, nil}
}

func (b *buf) uint8() uint8 {
	if len(b.data) < 1 {
		b.error("underflow")
		return 0
	}
	val := b.data[0]
	b.data = b.data[1:]
	b.off++
	return val
}

func (b *buf) bytes(n int) []byte {
	if n < 0 || len(b.data) < n {