-
Notifications
You must be signed in to change notification settings - Fork 0
/
writer.go
142 lines (116 loc) · 2.6 KB
/
writer.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
package buf
import (
"io"
"v2ray.com/core/common/errors"
)
// BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.
type BufferToBytesWriter struct {
writer io.Writer
}
// Write implements Writer.Write(). Write() takes ownership of the given buffer.
func (w *BufferToBytesWriter) Write(mb MultiBuffer) error {
defer mb.Release()
bs := mb.ToNetBuffers()
_, err := bs.WriteTo(w.writer)
return err
}
type writerAdapter struct {
writer MultiBufferWriter
}
// Write implements buf.MultiBufferWriter.
func (w *writerAdapter) Write(mb MultiBuffer) error {
return w.writer.WriteMultiBuffer(mb)
}
type mergingWriter struct {
writer io.Writer
buffer []byte
}
func (w *mergingWriter) Write(mb MultiBuffer) error {
defer mb.Release()
for !mb.IsEmpty() {
nBytes, _ := mb.Read(w.buffer)
if _, err := w.writer.Write(w.buffer[:nBytes]); err != nil {
return err
}
}
return nil
}
type seqWriter struct {
writer io.Writer
}
func (w *seqWriter) Write(mb MultiBuffer) error {
defer mb.Release()
for _, b := range mb {
if b.IsEmpty() {
continue
}
if _, err := w.writer.Write(b.Bytes()); err != nil {
return err
}
}
return nil
}
var (
_ MultiBufferWriter = (*bytesToBufferWriter)(nil)
)
type bytesToBufferWriter struct {
writer Writer
}
// Write implements io.Writer.
func (w *bytesToBufferWriter) Write(payload []byte) (int, error) {
mb := NewMultiBuffer()
mb.Write(payload)
if err := w.writer.Write(mb); err != nil {
return 0, err
}
return len(payload), nil
}
func (w *bytesToBufferWriter) WriteMultiBuffer(mb MultiBuffer) error {
return w.writer.Write(mb)
}
func (w *bytesToBufferWriter) ReadFrom(reader io.Reader) (int64, error) {
mbReader := NewReader(reader)
totalBytes := int64(0)
eof := false
for !eof {
mb, err := mbReader.Read()
if err == io.EOF {
eof = true
} else if err != nil {
return totalBytes, err
}
totalBytes += int64(mb.Len())
if err := w.writer.Write(mb); err != nil {
return totalBytes, err
}
}
return totalBytes, nil
}
type noOpWriter struct{}
func (noOpWriter) Write(b MultiBuffer) error {
b.Release()
return nil
}
type noOpBytesWriter struct{}
func (noOpBytesWriter) Write(b []byte) (int, error) {
return len(b), nil
}
func (noOpBytesWriter) ReadFrom(reader io.Reader) (int64, error) {
b := New()
defer b.Release()
totalBytes := int64(0)
for {
err := b.Reset(ReadFrom(reader))
totalBytes += int64(b.Len())
if err != nil {
if errors.Cause(err) == io.EOF {
return totalBytes, nil
}
return totalBytes, err
}
}
}
var (
Discard Writer = noOpWriter{}
DiscardBytes io.Writer = noOpBytesWriter{}
)