Golang Stream.Seek方法代碼示例

func encode_door(t *testing.T, wr *stream.Stream) {
	wr.SetSize(0)
	wr.Seek(0, 0)
	e := binutil.NewProtobufEncoder(wr)
	door := comp
	e.PutInt32(1, door.I32)
	e.PutInt64(2, door.I64)
	e.PutSint32(3, door.S32)
	e.PutSint64(4, door.S64)
	e.PutSfixed32(5, door.D32)
	e.PutSfixed64(6, door.D64)
	e.PutUint32(10, door.U32)
	e.PutUint64(11, door.U64)
	e.PutFixed32(12, door.X32)
	e.PutFixed64(13, door.X64)
	e.PutFloat32(20, door.F32)
	e.PutFloat64(21, door.F64)
	e.PutBool(30, door.B)
	e.PutString(31, door.S)
	e.PutEnum(32, door.E)
	encode_pos(dm, &door.Poslist[0])
	e.PutBytes(40, dm.Buf()[:dm.Position()])
	encode_pos(dm, &door.Poslist[1])
	e.PutBytes(40, dm.Buf()[:dm.Position()])
}

func encode_pos(wr *stream.Stream, pos *pbPos) {
	wr.SetSize(0)
	wr.Seek(0, 0)
	e := binutil.NewProtobufEncoder(wr)
	e.PutInt32(1, pos.X)
	e.PutInt32(2, pos.Y)
}

func decode_door(t *testing.T, rd *stream.Stream, last int, door *pbDoor) {
	rd.Seek(0, 0)
	d := binutil.NewProtobufDecoder(rd)
	posidx := 0
	for rd.Position() < last {
		_, tag, wire, _ := d.Tag()
		switch tag {
		case 0:
			t.Fatalf("test protobuf decode: got tag 0 when parse door\n")
		case 1:
			_, door.I32, _ = d.Int32()
		case 3:
			_, door.S32, _ = d.Sint32()
		case 5:
			_, door.D32, _ = d.Sfixed32()
		case 2:
			_, door.I64, _ = d.Int64()
		case 4:
			_, door.S64, _ = d.Sint64()
		case 6:
			_, door.D64, _ = d.Sfixed64()

		case 10:
			_, door.U32, _ = d.Uint32()
		case 12:
			_, door.X32, _ = d.Fixed32()
		case 11:
			_, door.U64, _ = d.Uint64()
		case 13:
			_, door.X64, _ = d.Fixed64()

		case 20:
			_, door.F32, _ = d.Float32()
		case 21:
			_, door.F64, _ = d.Float64()

		case 30:
			_, door.B, _ = d.Bool()
		case 31:
			_, door.S, _ = d.String()
		case 32:
			_, door.E, _ = d.Enum()
		case 40:
			_, u, _ := d.Uint64()
			m, L := int64(u), int(u)
			dm.SetSize(m)
			d.GetBody(dm.Buf()[:m])
			decode_pos(t, dm, L, &door.Poslist[posidx])
			if dm.Position() != L {
				t.Fatalf("test protobuf decode: got pos fail\n")
			}
			posidx++
		default:
			d.Skip(wire)
		}
	}
	if rd.Position() != last {
		t.Fatalf("test protobuf decode: parse pos, error tail position\n")
	}
}

func testByteOrder(t *testing.T, s *stream.Stream, in *byteorderSample) {
	s.SetSize(256)
	s.Seek(0, 0)
	data := s.Buf()
	whint := in.order.String()
	var m, n int
	m = in.order.PutUint8(data, byte(0x09))
	n = in.order.PutUint32(data[m:], uint32(0x1310))
	n += m
	L := len(in.output)
	if n != L {
		t.Fatalf("%s: outsize must %v, but got %v\n", whint, L, n)
	}
	for i, b := range in.output {
		if b != data[i] {
			t.Fatalf("%s: output[%d] must %2X, but got %2X\n", whint, i, b, data[i])
		}
	}
	for _, read := range in.reads {
		s.Seek(0, 0)
		rhint := read.order.String()
		var b byte
		var i uint32
		b, m = read.order.Uint8(data)
		i, n = read.order.Uint32(data[m:])
		n += m
		if n != L {
			t.Errorf("%s: read by %s: final position must be %v, but got %v\n", whint, rhint, L, n)
		} else if b != read.b {
			t.Errorf("%s: read by %s: expect %.2X, but got %.2X\n", whint, rhint, read.b, b)
		} else if i != read.i {
			t.Errorf("%s: read by %s: expect %.8X, but got %.8X\n", whint, rhint, read.i, i)
		}
	}
}

func testMarshal(t *testing.T, s *stream.Stream, in *marshalTestData) {
	var dummy = &datatype{}
	var n int
	var err error

	// println("*** encoding ***")
	s.SetSize(0)
	w := binutil.NewEncoder2(s, in.order, in.intNs)
	hint := w.String()
	n, err = w.Write(in.data)
	if err != nil {
		t.Errorf("encode(%s) error: %v\n", hint, err)
	}
	if n != in.outsize {
		t.Errorf("encode(%s) size must %v, but got %v\n", hint, in.outsize, n)
	}
	n = len(in.out)
	if n != in.outsize {
		t.Errorf("encode(%s) len(test) must %v, but got %v\n", hint, in.outsize, n)
	}
	b := s.Buf()
	n = len(b)
	if n != in.outsize {
		t.Errorf("encode(%s) len(dump) must %v, but got %v\n", hint, in.outsize, n)
	}
	for i, v := range in.out {
		if v != b[i] {
			t.Fatalf("marshal(%s) out[%v] must %2X, but got %2X\n", hint, i, v, b[i])
		}
	}
	//*
	// println("*** decoding ***")
	s.Seek(0, 0)
	r := binutil.NewDecoder2(s, in.order, in.intNs)
	n, err = r.Read(dummy)
	if err != nil {
		t.Errorf("decode(%s) error: %v\n", hint, err)
	}
	if n != in.outsize {
		t.Errorf("decode(%s) size must %v, but got %v\n", hint, in.outsize, n)
	}
	if !DeepEqual(in.data, dummy) {
		t.Fatalf("decode(%s) DeepEqual false\n", hint)
	}
	//*/
}

func testSeekAndReadByte(t *testing.T, s *stream.Stream, off int64, whence int, want_err error, want rune) {
	var (
		err error
		msg string
		b   byte
		c   rune
	)
	msg = fmt.Sprintf("Seek(%d, %d),", off, whence)
	_, err = s.Seek(off, whence)
	if err != want_err {
		t.Errorf("%s want error `%v`, but got `%v`\n", msg, want_err, err)
		return
	}
	b, _ = s.ReadByte()
	c = rune(b)
	if c != want {
		t.Errorf("%s ReadByte() is `%c`, want `%c`\n", msg, c, want)
	}
}

func decode_pos(t *testing.T, rd *stream.Stream, last int, pos *pbPos) {
	rd.Seek(0, 0)
	d := binutil.NewProtobufDecoder(rd)
	for rd.Position() < last {
		_, tag, wire, _ := d.Tag()
		switch tag {
		case 0:
			t.Fatalf("test protobuf decode: got tag 0 when parse pos\n")
		case 1:
			_, pos.X, _ = d.Int32()
		case 2:
			_, pos.Y, _ = d.Int32()
		default:
			d.Skip(wire)
		}
	}
	if rd.Position() != last {
		t.Fatalf("test protobuf decode: parse pos, error tail position\n")
	}
}