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unpacker_test.go
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unpacker_test.go
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package binpacker
import (
"bytes"
"io"
"testing"
"math"
"github.com/stretchr/testify/assert"
"encoding/binary"
)
// TestReader wraps a []byte and returns reads of a specific length.
// slightly modified version of one in https://golang.org/src/bufio/bufio_test.go
type testReader struct {
data []byte
stride int
}
func (t *testReader) Read(buf []byte) (n int, err error) {
n = t.stride
if n > len(t.data) {
n = len(t.data)
}
if n > len(buf) {
n = len(buf)
}
copy(buf, t.data[:n])
t.data = t.data[n:]
if len(t.data) == 0 {
err = io.EOF
}
return
}
func TestShiftByte(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushByte(0x01)
b, err := u.ShiftByte()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, b, byte(0x01), "byte error.")
}
func TestShiftBytes(t *testing.T) {
reader := &testReader{
data: []byte{0x01, 0x02, 0x03, 0x04, 0x05},
stride: 2,
}
u := NewUnpacker(binary.BigEndian, reader)
bs, err := u.ShiftBytes(5)
assert.NoError(t, err)
assert.Equal(t, []byte{0x01, 0x02, 0x03, 0x04, 0x05}, bs, "byte error.")
}
func TestShiftUint8(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushUint8(1)
i, err := u.ShiftUint8()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, uint8(1), "uint16 error.")
}
func TestShiftUint16(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushUint16(1)
i, err := u.ShiftUint16()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, uint16(1), "uint16 error.")
}
func TestShiftInt16(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushInt16(-1)
i, err := u.ShiftInt16()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, int16(-1), "uint16 error.")
}
func TestShiftUint32(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushUint32(1)
i, err := u.ShiftUint32()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, uint32(1), "uint32 error.")
}
func TestShiftInt32(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushInt32(-1)
i, err := u.ShiftInt32()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, int32(-1), "int32 error.")
}
func TestShiftUint64(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushUint64(1)
i, err := u.ShiftUint64()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, uint64(1), "uint64 error.")
}
func TestShiftFloat32(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushFloat32(math.SmallestNonzeroFloat32)
i, err := u.ShiftFloat32()
assert.Equal(t, err, nil, "Has error.")
// without explicit float32() conversion
// reflect convert math.SmallestNonzeroFloat32 to float64
// what is 0.0000000000000000000000000000000000000000000014012984643248170709237295832899161312802619418765157718
// instead 0.000000000000000000000000000000000000000000001
assert.Equal(t, i, float32(math.SmallestNonzeroFloat32), "float32 error.")
}
func TestShiftFloat64(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushFloat64(math.SmallestNonzeroFloat64)
i, err := u.ShiftFloat64()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, math.SmallestNonzeroFloat64, "float64 error.")
}
func TestFetchFloat32(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushFloat32(math.SmallestNonzeroFloat32)
var f float32
u.FetchFloat32(&f)
assert.Equal(t, f, float32(math.SmallestNonzeroFloat32), "float32 error.")
}
func TestFetchFloat64(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushFloat64(math.SmallestNonzeroFloat64)
var f float64
u.FetchFloat64(&f)
assert.Equal(t, f, math.SmallestNonzeroFloat64, "float64 error.")
}
func TestShiftInt64(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushInt64(-1)
i, err := u.ShiftInt64()
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, i, int64(-1), "int64 error.")
}
func TestShiftString(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushString("Hi")
s, err := u.ShiftString(2)
assert.Equal(t, err, nil, "Has error.")
assert.Equal(t, s, "Hi", "string error.")
}
func TestRead(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
p.PushByte(0x01)
p.PushBytes([]byte("Hi"))
p.PushUint8(1)
p.PushUint16(1)
p.PushInt16(-1)
p.PushUint32(1)
p.PushInt32(-1)
p.PushUint64(1)
p.PushInt64(-1)
p.PushString("Hi")
var b byte
var bs []byte
var ui8 uint8
var ui16 uint16
var i16 int16
var ui32 uint32
var i32 int32
var ui64 uint64
var i64 int64
var s string
u.FetchByte(&b).
FetchBytes(2, &bs).
FetchUint8(&ui8).
FetchUint16(&ui16).
FetchInt16(&i16).
FetchUint32(&ui32).
FetchInt32(&i32).
FetchUint64(&ui64).
FetchInt64(&i64).
FetchString(2, &s)
assert.Equal(t, u.err, nil, "Has Error.")
assert.Equal(t, u.Error(), nil, "Has Error.")
assert.Equal(t, b, byte(0x01), "byte error.")
assert.Equal(t, bs, []byte("Hi"), "bytes error.")
assert.Equal(t, ui8, uint8(1), "uint8 error.")
assert.Equal(t, ui16, uint16(1), "uint16 error.")
assert.Equal(t, i16, int16(-1), "int16 error.")
assert.Equal(t, ui32, uint32(1), "uint32 error.")
assert.Equal(t, i32, int32(-1), "int32 error.")
assert.Equal(t, ui64, uint64(1), "uint64 error.")
assert.Equal(t, i64, int64(-1), "int64 error.")
assert.Equal(t, s, "Hi", "string error.")
}
func TestReadWithPerfix(t *testing.T) {
buf := new(bytes.Buffer)
p := NewPacker(binary.BigEndian, buf)
u := NewUnpacker(binary.BigEndian, buf)
var bs []byte
var s string
p.PushUint16(2)
p.PushBytes([]byte("Hi"))
u.BytesWithUint16Perfix(&bs)
assert.Equal(t, bs, []byte("Hi"), "Bytes with prefixes error.")
p.PushUint16(2)
p.PushString("Hi")
u.StringWithUint16Perfix(&s)
assert.Equal(t, s, "Hi", "String with prefixes error.")
p.PushUint32(2)
p.PushBytes([]byte("Hi"))
u.BytesWithUint32Perfix(&bs)
assert.Equal(t, bs, []byte("Hi"), "Bytes with prefixes error.")
p.PushUint32(2)
p.PushString("Hi")
u.StringWithUint32Perfix(&s)
assert.Equal(t, s, "Hi", "String with prefixes error.")
p.PushUint64(2)
p.PushBytes([]byte("Hi"))
u.BytesWithUint64Perfix(&bs)
assert.Equal(t, bs, []byte("Hi"), "Bytes with prefixes error.")
p.PushUint64(2)
p.PushString("Hi")
u.StringWithUint64Perfix(&s)
assert.Equal(t, s, "Hi", "String with prefixes error.")
}