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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-22 18:17:52 -05:00
v2fly/common/io/chan_reader.go
2016-05-25 22:36:52 +02:00

67 lines
1002 B
Go

package io
import (
"io"
"sync"
"github.com/v2ray/v2ray-core/common/alloc"
)
type ChanReader struct {
sync.Mutex
stream Reader
current *alloc.Buffer
eof bool
}
func NewChanReader(stream Reader) *ChanReader {
this := &ChanReader{
stream: stream,
}
this.Fill()
return this
}
// @Private
func (this *ChanReader) Fill() {
b, err := this.stream.Read()
this.current = b
if err != nil {
this.eof = true
this.current = nil
}
}
func (this *ChanReader) Read(b []byte) (int, error) {
if this.eof {
return 0, io.EOF
}
this.Lock()
defer this.Unlock()
if this.current == nil {
this.Fill()
if this.eof {
return 0, io.EOF
}
}
nBytes := copy(b, this.current.Value)
if nBytes == this.current.Len() {
this.current.Release()
this.current = nil
} else {
this.current.SliceFrom(nBytes)
}
return nBytes, nil
}
func (this *ChanReader) Release() {
this.Lock()
defer this.Unlock()
this.eof = true
this.current.Release()
this.current = nil
this.stream = nil
}