remove unneeded function from the crypto stream interface

crypto_stream.go

@@ -0,0 +1,41 @@
+package quic
+
+import (
+	"io"
+
+	"github.com/lucas-clemente/quic-go/internal/flowcontrol"
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
+)
+
+type cryptoStreamI interface {
+	io.Reader
+	io.Writer
+	AddStreamFrame(*wire.StreamFrame) error
+	HasDataForWriting() bool
+	GetDataForWriting(maxBytes protocol.ByteCount) (data []byte, shouldSendFin bool)
+	GetWriteOffset() protocol.ByteCount
+	Cancel(error)
+	SetReadOffset(protocol.ByteCount)
+	// methods needed for flow control
+	GetWindowUpdate() protocol.ByteCount
+	UpdateSendWindow(protocol.ByteCount)
+	IsFlowControlBlocked() bool
+}
+
+type cryptoStream struct {
+	*stream
+}
+
+func newCryptoStream(onData func(), flowController flowcontrol.StreamFlowController, version protocol.VersionNumber) cryptoStreamI {
+	str := newStream(version.CryptoStreamID(), onData, nil, flowController, version)
+	return &cryptoStream{str}
+}
+
+// SetReadOffset sets the read offset.
+// It is only needed for the crypto stream.
+// It must not be called concurrently with any other stream methods, especially Read and Write.
+func (s *cryptoStream) SetReadOffset(offset protocol.ByteCount) {
+	s.readOffset = offset
+	s.frameQueue.readPosition = offset
+}