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