This repository has been archived by the owner on Apr 23, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
/
reader.go
190 lines (169 loc) · 4.07 KB
/
reader.go
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
package unity
import (
"bytes"
"encoding/binary"
"io/ioutil"
"os"
)
// DataReader Unityファイル用バイナリリーダー
type DataReader struct {
raw *[]byte
buffer *bytes.Reader
}
// NewDataReader new DataReader instance
func NewDataReader(b []byte) (*DataReader, error) {
buf := bytes.NewReader(b)
return &DataReader{
&b,
buf,
}, nil
}
// NewDataReaderFromFilePath new DataReader instance
func NewDataReaderFromFilePath(path string) (*DataReader, error) {
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return NewDataReader(b)
}
// ReadByte read 1 byte
func (data *DataReader) ReadByte() (byte, error) {
return data.buffer.ReadByte()
}
func selectByteOrder(isLittleEndian bool) binary.ByteOrder {
var endian binary.ByteOrder
if isLittleEndian {
endian = binary.LittleEndian
} else {
endian = binary.BigEndian
}
return endian
}
// ReadChar read short
func (data *DataReader) ReadChar(isLittleEndian bool) (int8, error) {
var i int8
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadUchar read short
func (data *DataReader) ReadUchar(isLittleEndian bool) (uint8, error) {
var i uint8
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadShort read short
func (data *DataReader) ReadShort(isLittleEndian bool) (int16, error) {
var i int16
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadUshort read unsigned short
func (data *DataReader) ReadUshort(isLittleEndian bool) (uint16, error) {
var i uint16
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadInt read int
func (data *DataReader) ReadInt(isLittleEndian bool) (int32, error) {
var i int32
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadUint read unsigned int
func (data *DataReader) ReadUint(isLittleEndian bool) (uint32, error) {
var i uint32
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadLong read long
func (data *DataReader) ReadLong(isLittleEndian bool) (int64, error) {
var i int64
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
// ReadUlong read unsigned long
func (data *DataReader) ReadUlong(isLittleEndian bool) (uint64, error) {
var i uint64
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &i)
if err != nil {
return 0, err
}
return i, nil
}
func (data *DataReader) ReadBytes(size int, isLittleEndian bool) ([]byte, error) {
b := make([]byte, size)
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &b)
if err != nil {
return []byte{}, err
}
return b, nil
}
// ReNew
func (data *DataReader) ReNew(size int, isLittleEndian bool) (*DataReader, error) {
b := make([]byte, size)
err := binary.Read(data.buffer, selectByteOrder(isLittleEndian), &b)
if err != nil {
return nil, err
}
buf := bytes.NewReader(b)
return &DataReader{
&b,
buf,
}, nil
}
// ReadStringNull 0x00に到達するまで文字列を読み込む
func (data *DataReader) ReadStringNull(limit int) (string, error) {
b := []byte{}
for i := 0; i < limit; i++ {
c, err := data.ReadByte()
if err != nil {
return "", err
}
if c == 0 {
break
}
b = append(b, c)
}
return string(b), nil
}
// Seek implements the io.Seeker interface.
func (data *DataReader) Seek(offset int64, whence int) (int64, error) {
return data.buffer.Seek(offset, whence)
}
// Len Return the current stream position.
func (data *DataReader) Len() int {
return data.buffer.Len()
}
func (data *DataReader) Align() error {
size := len(*data.raw)
oldPos := size - data.buffer.Len()
newPos := (oldPos + 3) & -4
if newPos > oldPos {
_, err := data.buffer.Seek(int64(newPos-oldPos), os.SEEK_CUR)
if err != nil {
return err
}
}
return nil
}