Implement QuicStreamSequencerBuffer::PeekRegion().
gfe-relnote: n/a, no functional change.
PiperOrigin-RevId: 254856738
Change-Id: I34f1fd30429f8d5d403fa17fc1f4a127c074f952
diff --git a/quic/core/quic_stream_sequencer_buffer.h b/quic/core/quic_stream_sequencer_buffer.h
index 08a1ab4..6347b1c 100644
--- a/quic/core/quic_stream_sequencer_buffer.h
+++ b/quic/core/quic_stream_sequencer_buffer.h
@@ -131,10 +131,17 @@
// Returns false if there is no readable region available.
bool GetReadableRegion(iovec* iov) const;
+ // Returns true and sets |*iov| to point to a region starting at |offset|.
+ // Returns false if no data can be read at |offset|, which can be because data
+ // has not been received yet or it is already consumed.
+ // Does not consume data.
+ bool PeekRegion(QuicStreamOffset offset, iovec* iov) const;
+
+ // DEPRECATED, use PeekRegion() instead.
// Called to return the next region that has not been returned by this method
- // previously.
- // If this method is to be used along with Readv() or MarkConsumed(), make
- // sure that they are consuming less data than is read by this method.
+ // previously, except if Clear() has been called then prefetch offset is set
+ // to BytesConsumed(), and if Readv() or MarkConsumed() reads further than
+ // prefetch offset, then offset is set to beginning of not yet consumed area.
// This method only returns reference of underlying data. The caller is
// responsible for copying and consuming the data.
// Returns true if the data is read, false otherwise.
