implement a buffer pool for STREAM frames

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fuzzing/frames/fuzz.go

@@ -57,6 +57,7 @@ func Fuzz(data []byte) int {
 		// We accept empty STREAM frames, but we don't write them.
 		if sf, ok := f.(*wire.StreamFrame); ok {
 			if sf.DataLen() == 0 {
+				sf.PutBack()
 				continue
 			}
 		}
@@ -68,6 +69,9 @@ func Fuzz(data []byte) int {
 		if f.Length(version) != protocol.ByteCount(frameLen) {
 			panic(fmt.Sprintf("Inconsistent frame length for %#v: expected %d, got %d", f, frameLen, f.Length(version)))
 		}
+		if sf, ok := f.(*wire.StreamFrame); ok {
+			sf.PutBack()
+		}
 	}
 	if b.Len() > parsedLen {
 		panic(fmt.Sprintf("Serialized length (%d) is longer than parsed length (%d)", b.Len(), parsedLen))

fuzzing/frames/main.go

@@ -88,6 +88,12 @@ func getFrames() []wire.Frame {
 			Data:     getRandomData(50),
 			FinBit:   true,
 		},
+		&wire.StreamFrame{ // STREAM frame at non-zero offset, with data and FIN bit. Long enough to use the buffer.
+			StreamID: protocol.StreamID(getRandomNumber()),
+			Offset:   protocol.ByteCount(getRandomNumber()),
+			Data:     getRandomData(2 * protocol.MinStreamFrameBufferSize),
+			FinBit:   true,
+		},
 		&wire.StreamFrame{ // STREAM frame at maximum offset, with FIN bit
 			StreamID: protocol.StreamID(getRandomNumber()),
 			Offset:   protocol.MaxByteCount - 5,