102 lines
1.9 KiB
Go
102 lines
1.9 KiB
Go
package vmess
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"errors"
|
|
"io"
|
|
|
|
"github.com/Dreamacro/clash/common/pool"
|
|
)
|
|
|
|
const (
|
|
lenSize = 2
|
|
chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
|
|
maxSize = 17 * 1024 // 2 + chunkSize + aead.Overhead()
|
|
)
|
|
|
|
type chunkReader struct {
|
|
io.Reader
|
|
buf []byte
|
|
sizeBuf []byte
|
|
offset int
|
|
}
|
|
|
|
func newChunkReader(reader io.Reader) *chunkReader {
|
|
return &chunkReader{Reader: reader, sizeBuf: make([]byte, lenSize)}
|
|
}
|
|
|
|
func newChunkWriter(writer io.WriteCloser) *chunkWriter {
|
|
return &chunkWriter{Writer: writer}
|
|
}
|
|
|
|
func (cr *chunkReader) Read(b []byte) (int, error) {
|
|
if cr.buf != nil {
|
|
n := copy(b, cr.buf[cr.offset:])
|
|
cr.offset += n
|
|
if cr.offset == len(cr.buf) {
|
|
pool.BufPool.Put(cr.buf[:cap(cr.buf)])
|
|
cr.buf = nil
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
_, err := io.ReadFull(cr.Reader, cr.sizeBuf)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
size := int(binary.BigEndian.Uint16(cr.sizeBuf))
|
|
if size > maxSize {
|
|
return 0, errors.New("Buffer is larger than standard")
|
|
}
|
|
|
|
if len(b) >= size {
|
|
_, err := io.ReadFull(cr.Reader, b[:size])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return size, nil
|
|
}
|
|
|
|
buf := pool.BufPool.Get().([]byte)
|
|
_, err = io.ReadFull(cr.Reader, buf[:size])
|
|
if err != nil {
|
|
pool.BufPool.Put(buf[:cap(buf)])
|
|
return 0, err
|
|
}
|
|
n := copy(b, cr.buf[:])
|
|
cr.offset = n
|
|
cr.buf = buf[:size]
|
|
return n, nil
|
|
}
|
|
|
|
type chunkWriter struct {
|
|
io.Writer
|
|
}
|
|
|
|
func (cw *chunkWriter) Write(b []byte) (n int, err error) {
|
|
buf := pool.BufPool.Get().([]byte)
|
|
defer pool.BufPool.Put(buf[:cap(buf)])
|
|
length := len(b)
|
|
for {
|
|
if length == 0 {
|
|
break
|
|
}
|
|
readLen := chunkSize
|
|
if length < chunkSize {
|
|
readLen = length
|
|
}
|
|
payloadBuf := buf[lenSize : lenSize+chunkSize]
|
|
copy(payloadBuf, b[n:n+readLen])
|
|
|
|
binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen))
|
|
_, err = cw.Writer.Write(buf[:lenSize+readLen])
|
|
if err != nil {
|
|
break
|
|
}
|
|
n += readLen
|
|
length -= readLen
|
|
}
|
|
return
|
|
}
|