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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
// 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"
"os"
"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 os.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, os.Error) {
n := copy(p, br.remain)
br.remain = br.remain[n:]
return n, nil
}
func BenchmarkRead(b *testing.B) {
var ls Struct
bsr := &byteSliceReader{}
var r io.Reader = bsr
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
}
if !reflect.DeepEqual(ls, want) {
panic("no match")
}
}
func BenchmarkWrite(b *testing.B) {
buf := new(bytes.Buffer)
var w io.Writer = buf
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)
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)
}
if !bytes.Equal(buf.Bytes()[:30], big[:30]) {
panic("first half doesn't match")
}
if !bytes.Equal(buf.Bytes()[30:], big[:30]) {
panic("second half doesn't match")
}
}
|
