forked from wapc/tinygo-msgpack
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathdata_reader.go
More file actions
261 lines (229 loc) · 5.54 KB
/
data_reader.go
File metadata and controls
261 lines (229 loc) · 5.54 KB
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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
package msgpack
// read and write bytes and sized numbers from data stream. BigEndian.
import (
"encoding/binary"
"errors"
"math"
)
var ErrRange = errors.New("range error")
type DataReader struct {
buffer []byte
byteOffset uint32
err error
}
func NewDataReader(buffer []byte) DataReader {
return DataReader{
buffer: buffer,
}
}
func (d *DataReader) checkRange(n uint32) error {
if d.byteOffset+n > uint32(len(d.buffer)) {
d.updateError(ErrRange)
return d.err
}
return nil
}
// check whether any errors have occurred
func (d *DataReader) CheckError() error {
return d.err
}
func (d *DataReader) updateError(err error) {
if d.err == nil {
d.err = err
}
}
func (d *DataReader) GetBytes(length uint32) ([]byte, error) {
if length == 0 {
return make([]byte, 0), nil
}
if err := d.checkRange(length); err != nil {
return nil, err
}
result := d.buffer[d.byteOffset : d.byteOffset+length]
d.byteOffset += length
return result, nil
}
func (d *DataReader) SetBytes(src []byte) error {
srcLen := uint32(len(src))
if err := d.checkRange(srcLen); err != nil {
return err
}
copy(d.buffer[d.byteOffset:], src)
d.byteOffset += srcLen
return nil
}
func (d *DataReader) PeekUint8() (uint8, error) {
if err := d.checkRange(1); err != nil {
return 0, err
}
return d.buffer[d.byteOffset], nil
}
func (d *DataReader) Discard(length uint32) error {
if err := d.checkRange(length); err != nil {
return err
}
d.byteOffset += length
return nil
}
func (d *DataReader) GetFloat32() (float32, error) {
if err := d.checkRange(4); err != nil {
return 0, err
}
v := binary.BigEndian.Uint32(d.buffer[d.byteOffset:])
d.byteOffset += 4
return math.Float32frombits(v), nil
}
func (d *DataReader) GetFloat64() (float64, error) {
if err := d.checkRange(8); err != nil {
return 0, err
}
v := binary.BigEndian.Uint64(d.buffer[d.byteOffset:])
d.byteOffset += 8
return math.Float64frombits(v), nil
}
func (d *DataReader) GetInt8() (int8, error) {
if err := d.checkRange(1); err != nil {
return 0, err
}
result := d.buffer[d.byteOffset]
d.byteOffset++
return int8(result), nil
}
func (d *DataReader) GetInt16() (int16, error) {
if err := d.checkRange(2); err != nil {
return 0, err
}
result := binary.BigEndian.Uint16(d.buffer[d.byteOffset:])
d.byteOffset += 2
return int16(result), nil
}
func (d *DataReader) GetInt32() (int32, error) {
if err := d.checkRange(4); err != nil {
return 0, err
}
result := binary.BigEndian.Uint32(d.buffer[d.byteOffset:])
d.byteOffset += 4
return int32(result), nil
}
func (d *DataReader) GetInt64() (int64, error) {
if err := d.checkRange(8); err != nil {
return 0, err
}
result := binary.BigEndian.Uint64(d.buffer[d.byteOffset:])
d.byteOffset += 8
return int64(result), nil
}
func (d *DataReader) GetUint8() (uint8, error) {
if err := d.checkRange(1); err != nil {
return 0, err
}
result := d.buffer[d.byteOffset]
d.byteOffset++
return result, nil
}
func (d *DataReader) GetUint16() (uint16, error) {
if err := d.checkRange(2); err != nil {
return 0, err
}
result := binary.BigEndian.Uint16(d.buffer[d.byteOffset:])
d.byteOffset += 2
return result, nil
}
func (d *DataReader) GetUint32() (uint32, error) {
if err := d.checkRange(4); err != nil {
return 0, err
}
result := binary.BigEndian.Uint32(d.buffer[d.byteOffset:])
d.byteOffset += 4
return result, nil
}
func (d *DataReader) GetUint64() (uint64, error) {
if err := d.checkRange(8); err != nil {
return 0, err
}
result := binary.BigEndian.Uint64(d.buffer[d.byteOffset:])
d.byteOffset += 8
return result, nil
}
func (d *DataReader) SetFloat32(value float32) error {
if err := d.checkRange(4); err != nil {
return err
}
bits := math.Float32bits(value)
binary.BigEndian.PutUint32(d.buffer[d.byteOffset:], bits)
d.byteOffset += 4
return nil
}
func (d *DataReader) SetFloat64(value float64) error {
if err := d.checkRange(8); err != nil {
return err
}
bits := math.Float64bits(value)
binary.BigEndian.PutUint64(d.buffer[d.byteOffset:], bits)
d.byteOffset += 8
return nil
}
func (d *DataReader) SetInt8(value int8) error {
if err := d.checkRange(1); err != nil {
return err
}
d.buffer[d.byteOffset] = uint8(value)
d.byteOffset++
return nil
}
func (d *DataReader) SetInt16(value int16) error {
if err := d.checkRange(2); err != nil {
return err
}
binary.BigEndian.PutUint16(d.buffer[d.byteOffset:], uint16(value))
d.byteOffset += 2
return nil
}
func (d *DataReader) SetInt32(value int32) error {
if err := d.checkRange(4); err != nil {
return err
}
binary.BigEndian.PutUint32(d.buffer[d.byteOffset:], uint32(value))
d.byteOffset += 4
return nil
}
func (d *DataReader) SetInt64(value int64) error {
if err := d.checkRange(8); err != nil {
return err
}
binary.BigEndian.PutUint64(d.buffer[d.byteOffset:], uint64(value))
d.byteOffset += 8
return nil
}
func (d *DataReader) SetUint8(value uint8) error {
if err := d.checkRange(1); err != nil {
return err
}
d.buffer[d.byteOffset] = value
d.byteOffset++
return nil
}
func (d *DataReader) SetUint16(value uint16) error {
if err := d.checkRange(2); err != nil {
return err
}
binary.BigEndian.PutUint16(d.buffer[d.byteOffset:], value)
d.byteOffset += 2
return nil
}
func (d *DataReader) SetUint32(value uint32) error {
if err := d.checkRange(4); err != nil {
return err
}
binary.BigEndian.PutUint32(d.buffer[d.byteOffset:], value)
d.byteOffset += 4
return nil
}
func (d *DataReader) SetUint64(value uint64) error {
if err := d.checkRange(8); err != nil {
return err
}
binary.BigEndian.PutUint64(d.buffer[d.byteOffset:], value)
d.byteOffset += 8
return nil
}