266 lines
6.4 KiB
Go
266 lines
6.4 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package binary
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"reflect"
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"testing"
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)
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func newInt32(i int32) *int32 {
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return &i
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}
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func TestSize(t *testing.T) {
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if got, want := Size(uint32(10)), uintptr(4); got != want {
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t.Errorf("Got = %d, want = %d", got, want)
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}
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}
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func TestPanic(t *testing.T) {
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tests := []struct {
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name string
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f func([]byte, binary.ByteOrder, interface{})
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data interface{}
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want string
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}{
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{"Unmarshal int", Unmarshal, 5, "invalid type: int"},
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{"Unmarshal []int", Unmarshal, []int{5}, "invalid type: int"},
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{"Marshal int", func(_ []byte, bo binary.ByteOrder, d interface{}) { Marshal(nil, bo, d) }, 5, "invalid type: int"},
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{"Marshal int[]", func(_ []byte, bo binary.ByteOrder, d interface{}) { Marshal(nil, bo, d) }, []int{5}, "invalid type: int"},
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{"Unmarshal short buffer", Unmarshal, newInt32(5), "runtime error: index out of range"},
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{"Unmarshal long buffer", func(_ []byte, bo binary.ByteOrder, d interface{}) { Unmarshal(make([]byte, 50), bo, d) }, newInt32(5), "buffer too long by 46 bytes"},
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{"marshal int", func(_ []byte, bo binary.ByteOrder, d interface{}) { marshal(nil, bo, reflect.ValueOf(d)) }, 5, "invalid type: int"},
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{"Size int", func(_ []byte, _ binary.ByteOrder, d interface{}) { Size(d) }, 5, "invalid type: int"},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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defer func() {
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r := recover()
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if got := fmt.Sprint(r); got != test.want {
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t.Errorf("Got recover() = %q, want = %q", got, test.want)
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}
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}()
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test.f(nil, LittleEndian, test.data)
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})
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}
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}
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type inner struct {
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Field int32
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}
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type outer struct {
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Int8 int8
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Int16 int16
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Int32 int32
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Int64 int64
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Uint8 uint8
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Uint16 uint16
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Uint32 uint32
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Uint64 uint64
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Slice []int32
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Array [5]int32
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Struct inner
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}
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func TestMarshalUnmarshal(t *testing.T) {
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want := outer{
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1, 2, 3, 4, 5, 6, 7, 8,
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[]int32{9, 10, 11},
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[5]int32{12, 13, 14, 15, 16},
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inner{17},
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}
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buf := Marshal(nil, LittleEndian, want)
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got := outer{Slice: []int32{0, 0, 0}}
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Unmarshal(buf, LittleEndian, &got)
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if !reflect.DeepEqual(&got, &want) {
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t.Errorf("Got = %#v, want = %#v", got, want)
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}
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}
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type outerBenchmark struct {
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Int8 int8
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Int16 int16
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Int32 int32
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Int64 int64
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Uint8 uint8
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Uint16 uint16
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Uint32 uint32
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Uint64 uint64
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Array [5]int32
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Struct inner
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}
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func BenchmarkMarshalUnmarshal(b *testing.B) {
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b.ReportAllocs()
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in := outerBenchmark{
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1, 2, 3, 4, 5, 6, 7, 8,
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[5]int32{9, 10, 11, 12, 13},
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inner{14},
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}
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buf := make([]byte, Size(&in))
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out := outerBenchmark{}
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for i := 0; i < b.N; i++ {
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buf := Marshal(buf[:0], LittleEndian, &in)
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Unmarshal(buf, LittleEndian, &out)
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}
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}
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func BenchmarkReadWrite(b *testing.B) {
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b.ReportAllocs()
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in := outerBenchmark{
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1, 2, 3, 4, 5, 6, 7, 8,
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[5]int32{9, 10, 11, 12, 13},
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inner{14},
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}
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buf := bytes.NewBuffer(make([]byte, binary.Size(&in)))
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out := outerBenchmark{}
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for i := 0; i < b.N; i++ {
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buf.Reset()
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if err := binary.Write(buf, LittleEndian, &in); err != nil {
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b.Error("Write:", err)
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}
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if err := binary.Read(buf, LittleEndian, &out); err != nil {
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b.Error("Read:", err)
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}
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}
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}
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type outerPadding struct {
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_ int8
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_ int16
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_ int32
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_ int64
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_ uint8
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_ uint16
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_ uint32
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_ uint64
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_ []int32
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_ [5]int32
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_ inner
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}
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func TestMarshalUnmarshalPadding(t *testing.T) {
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var want outerPadding
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buf := Marshal(nil, LittleEndian, want)
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var got outerPadding
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Unmarshal(buf, LittleEndian, &got)
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if !reflect.DeepEqual(&got, &want) {
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t.Errorf("Got = %#v, want = %#v", got, want)
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}
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}
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// Numbers with bits in every byte that distinguishable in big and little endian.
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const (
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want16 = 64<<8 | 128
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want32 = 16<<24 | 32<<16 | want16
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want64 = 1<<56 | 2<<48 | 4<<40 | 8<<32 | want32
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)
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func TestReadWriteUint16(t *testing.T) {
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const want = uint16(want16)
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var buf bytes.Buffer
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if err := WriteUint16(&buf, LittleEndian, want); err != nil {
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t.Error("WriteUint16:", err)
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}
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got, err := ReadUint16(&buf, LittleEndian)
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if err != nil {
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t.Error("ReadUint16:", err)
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}
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if got != want {
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t.Errorf("got = %d, want = %d", got, want)
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}
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}
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func TestReadWriteUint32(t *testing.T) {
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const want = uint32(want32)
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var buf bytes.Buffer
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if err := WriteUint32(&buf, LittleEndian, want); err != nil {
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t.Error("WriteUint32:", err)
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}
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got, err := ReadUint32(&buf, LittleEndian)
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if err != nil {
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t.Error("ReadUint32:", err)
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}
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if got != want {
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t.Errorf("got = %d, want = %d", got, want)
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}
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}
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func TestReadWriteUint64(t *testing.T) {
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const want = uint64(want64)
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var buf bytes.Buffer
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if err := WriteUint64(&buf, LittleEndian, want); err != nil {
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t.Error("WriteUint64:", err)
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}
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got, err := ReadUint64(&buf, LittleEndian)
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if err != nil {
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t.Error("ReadUint64:", err)
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}
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if got != want {
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t.Errorf("got = %d, want = %d", got, want)
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}
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}
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type readWriter struct {
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err error
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}
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func (rw *readWriter) Write([]byte) (int, error) {
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return 0, rw.err
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}
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func (rw *readWriter) Read([]byte) (int, error) {
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return 0, rw.err
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}
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func TestReadWriteError(t *testing.T) {
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tests := []struct {
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name string
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f func(rw io.ReadWriter) error
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}{
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{"WriteUint16", func(rw io.ReadWriter) error { return WriteUint16(rw, LittleEndian, 0) }},
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{"ReadUint16", func(rw io.ReadWriter) error { _, err := ReadUint16(rw, LittleEndian); return err }},
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{"WriteUint32", func(rw io.ReadWriter) error { return WriteUint32(rw, LittleEndian, 0) }},
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{"ReadUint32", func(rw io.ReadWriter) error { _, err := ReadUint32(rw, LittleEndian); return err }},
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{"WriteUint64", func(rw io.ReadWriter) error { return WriteUint64(rw, LittleEndian, 0) }},
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{"ReadUint64", func(rw io.ReadWriter) error { _, err := ReadUint64(rw, LittleEndian); return err }},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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want := errors.New("want")
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if got := test.f(&readWriter{want}); got != want {
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t.Errorf("got = %v, want = %v", got, want)
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}
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})
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}
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}
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