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