Subversion Repositories openrisc

// Copyright 2009 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 binary

import (
        "bytes"
        "io"
        "math"
        "reflect"
        "testing"
)

type Struct struct {
        Int8       int8
        Int16      int16
        Int32      int32
        Int64      int64
        Uint8      uint8
        Uint16     uint16
        Uint32     uint32
        Uint64     uint64
        Float32    float32
        Float64    float64
        Complex64  complex64
        Complex128 complex128
        Array      [4]uint8
}

type T struct {
        Int     int
        Uint    uint
        Uintptr uintptr
        Array   [4]int
}

var s = Struct{
        0x01,
        0x0203,
        0x04050607,
        0x08090a0b0c0d0e0f,
        0x10,
        0x1112,
        0x13141516,
        0x1718191a1b1c1d1e,

        math.Float32frombits(0x1f202122),
        math.Float64frombits(0x232425262728292a),
        complex(
                math.Float32frombits(0x2b2c2d2e),
                math.Float32frombits(0x2f303132),
        ),
        complex(
                math.Float64frombits(0x333435363738393a),
                math.Float64frombits(0x3b3c3d3e3f404142),
        ),

        [4]uint8{0x43, 0x44, 0x45, 0x46},
}

var big = []byte{
        1,
        2, 3,
        4, 5, 6, 7,
        8, 9, 10, 11, 12, 13, 14, 15,
        16,
        17, 18,
        19, 20, 21, 22,
        23, 24, 25, 26, 27, 28, 29, 30,

        31, 32, 33, 34,
        35, 36, 37, 38, 39, 40, 41, 42,
        43, 44, 45, 46, 47, 48, 49, 50,
        51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66,

        67, 68, 69, 70,
}

var little = []byte{
        1,
        3, 2,
        7, 6, 5, 4,
        15, 14, 13, 12, 11, 10, 9, 8,
        16,
        18, 17,
        22, 21, 20, 19,
        30, 29, 28, 27, 26, 25, 24, 23,

        34, 33, 32, 31,
        42, 41, 40, 39, 38, 37, 36, 35,
        46, 45, 44, 43, 50, 49, 48, 47,
        58, 57, 56, 55, 54, 53, 52, 51, 66, 65, 64, 63, 62, 61, 60, 59,

        67, 68, 69, 70,
}

var src = []byte{1, 2, 3, 4, 5, 6, 7, 8}
var res = []int32{0x01020304, 0x05060708}

func checkResult(t *testing.T, dir string, order ByteOrder, err error, have, want interface{}) {
        if err != nil {
                t.Errorf("%v %v: %v", dir, order, err)
                return
        }
        if !reflect.DeepEqual(have, want) {
                t.Errorf("%v %v:\n\thave %+v\n\twant %+v", dir, order, have, want)
        }
}

func testRead(t *testing.T, order ByteOrder, b []byte, s1 interface{}) {
        var s2 Struct
        err := Read(bytes.NewBuffer(b), order, &s2)
        checkResult(t, "Read", order, err, s2, s1)
}

func testWrite(t *testing.T, order ByteOrder, b []byte, s1 interface{}) {
        buf := new(bytes.Buffer)
        err := Write(buf, order, s1)
        checkResult(t, "Write", order, err, buf.Bytes(), b)
}

func TestBigEndianRead(t *testing.T) { testRead(t, BigEndian, big, s) }

func TestLittleEndianRead(t *testing.T) { testRead(t, LittleEndian, little, s) }

func TestBigEndianWrite(t *testing.T) { testWrite(t, BigEndian, big, s) }

func TestLittleEndianWrite(t *testing.T) { testWrite(t, LittleEndian, little, s) }

func TestBigEndianPtrWrite(t *testing.T) { testWrite(t, BigEndian, big, &s) }

func TestLittleEndianPtrWrite(t *testing.T) { testWrite(t, LittleEndian, little, &s) }

func TestReadSlice(t *testing.T) {
        slice := make([]int32, 2)
        err := Read(bytes.NewBuffer(src), BigEndian, slice)
        checkResult(t, "ReadSlice", BigEndian, err, slice, res)
}

func TestWriteSlice(t *testing.T) {
        buf := new(bytes.Buffer)
        err := Write(buf, BigEndian, res)
        checkResult(t, "WriteSlice", BigEndian, err, buf.Bytes(), src)
}

func TestWriteT(t *testing.T) {
        buf := new(bytes.Buffer)
        ts := T{}
        err := Write(buf, BigEndian, ts)
        if err == nil {
                t.Errorf("WriteT: have nil, want non-nil")
        }

        tv := reflect.Indirect(reflect.ValueOf(ts))
        for i, n := 0, tv.NumField(); i < n; i++ {
                err = Write(buf, BigEndian, tv.Field(i).Interface())
                if err == nil {
                        t.Errorf("WriteT.%v: have nil, want non-nil", tv.Field(i).Type())
                }
        }
}

type byteSliceReader struct {
        remain []byte
}

func (br *byteSliceReader) Read(p []byte) (int, error) {
        n := copy(p, br.remain)
        br.remain = br.remain[n:]
        return n, nil
}

func BenchmarkReadSlice1000Int32s(b *testing.B) {
        bsr := &byteSliceReader{}
        slice := make([]int32, 1000)
        buf := make([]byte, len(slice)*4)
        b.SetBytes(int64(len(buf)))
        b.ResetTimer()
        for i := 0; i < b.N; i++ {
                bsr.remain = buf
                Read(bsr, BigEndian, slice)
        }
}

func BenchmarkReadStruct(b *testing.B) {
        bsr := &byteSliceReader{}
        var buf bytes.Buffer
        Write(&buf, BigEndian, &s)
        n := dataSize(reflect.ValueOf(s))
        b.SetBytes(int64(n))
        t := s
        b.ResetTimer()
        for i := 0; i < b.N; i++ {
                bsr.remain = buf.Bytes()
                Read(bsr, BigEndian, &t)
        }
        b.StopTimer()
        if !reflect.DeepEqual(s, t) {
                b.Fatal("no match")
        }
}

func BenchmarkReadInts(b *testing.B) {
        var ls Struct
        bsr := &byteSliceReader{}
        var r io.Reader = bsr
        b.SetBytes(2 * (1 + 2 + 4 + 8))
        b.ResetTimer()
        for i := 0; i < b.N; i++ {
                bsr.remain = big
                Read(r, BigEndian, &ls.Int8)
                Read(r, BigEndian, &ls.Int16)
                Read(r, BigEndian, &ls.Int32)
                Read(r, BigEndian, &ls.Int64)
                Read(r, BigEndian, &ls.Uint8)
                Read(r, BigEndian, &ls.Uint16)
                Read(r, BigEndian, &ls.Uint32)
                Read(r, BigEndian, &ls.Uint64)
        }

        want := s
        want.Float32 = 0
        want.Float64 = 0
        want.Complex64 = 0
        want.Complex128 = 0
        for i := range want.Array {
                want.Array[i] = 0
        }
        b.StopTimer()
        if !reflect.DeepEqual(ls, want) {
                panic("no match")
        }
}

func BenchmarkWriteInts(b *testing.B) {
        buf := new(bytes.Buffer)
        var w io.Writer = buf
        b.SetBytes(2 * (1 + 2 + 4 + 8))
        b.ResetTimer()
        for i := 0; i < b.N; i++ {
                buf.Reset()
                Write(w, BigEndian, s.Int8)
                Write(w, BigEndian, s.Int16)
                Write(w, BigEndian, s.Int32)
                Write(w, BigEndian, s.Int64)
                Write(w, BigEndian, s.Uint8)
                Write(w, BigEndian, s.Uint16)
                Write(w, BigEndian, s.Uint32)
                Write(w, BigEndian, s.Uint64)
        }
        b.StopTimer()
        if !bytes.Equal(buf.Bytes(), big[:30]) {
                b.Fatalf("first half doesn't match: %x %x", buf.Bytes(), big[:30])
        }
}