Remove parity tracking in FEC groups as part of the migration to

net/quic/quic_fec_group.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Tracks information about an FEC group, including the packets
 // that have been seen, and the running parity.  Provided the ability
 // to revive a dropped packet.
 
 #ifndef NET_QUIC_QUIC_FEC_GROUP_H_
 #define NET_QUIC_QUIC_FEC_GROUP_H_
@@ skipping 13 matching lines @@
   // Updates the FEC group based on the delivery of a data packet.
   // Returns false if this packet has already been seen, true otherwise.
   bool Update(const QuicPacketHeader& header,
               base::StringPiece decrypted_payload);
 
   // Updates the FEC group based on the delivery of an FEC packet.
   // Returns false if this packet has already been seen or if it does
   // not claim to protect all the packets previously seen in this group.
   //   |fec_packet_entropy|: XOR of entropy of all packets in the fec group.
   bool UpdateFec(QuicPacketSequenceNumber fec_packet_sequence_number,
-                 bool fec_packet_entropy,
                  const QuicFecData& fec);
 
   // Returns true if a packet can be revived from this FEC group.
   bool CanRevive() const;
 
   // Returns true if all packets (FEC and data) from this FEC group have been
   // seen or revived
   bool IsFinished() const;
 
   // Revives the missing packet from this FEC group.  This may return a packet
   // that is null padded to a greater length than the original packet, but
   // the framer will handle it correctly.  Returns the length of the data
   // written to |decrypted_payload|, or 0 if the packet could not be revived.
   size_t Revive(QuicPacketHeader* header,
                 char* decrypted_payload,
                 size_t decrypted_payload_len);
 
   // Returns true of this FEC group protects any packets with sequence
   // numbers less than |num|.
   bool ProtectsPacketsBefore(QuicPacketSequenceNumber num) const;
 
   const base::StringPiece payload_parity() const {
     return base::StringPiece(payload_parity_, payload_parity_len_);
   }
 
-  bool entropy_parity() const {
-    return entropy_parity_;
-  }
-
   QuicPacketSequenceNumber min_protected_packet() const {
     return min_protected_packet_;
   }
 
   size_t NumReceivedPackets() const {
     return received_packets_.size();
   }
 
  private:
-  bool UpdateParity(base::StringPiece payload, bool entropy);
+  bool UpdateParity(base::StringPiece payload);
   // Returns the number of missing packets, or size_t max if the number
   // of missing packets is not known.
   size_t NumMissingPackets() const;
 
   // Set of packets that we have recevied.
   SequenceNumberSet received_packets_;
   // Sequence number of the first protected packet in this group (the one
   // with the lowest packet sequence number).  Will only be set once the FEC
   // packet has been seen.
   QuicPacketSequenceNumber min_protected_packet_;
   // Sequence number of the last protected packet in this group (the one
   // with the highest packet sequence number).  Will only be set once the FEC
   // packet has been seen.
   QuicPacketSequenceNumber max_protected_packet_;
   // The cumulative parity calculation of all received packets.
   char payload_parity_[kMaxPacketSize];
   size_t payload_parity_len_;
-  bool entropy_parity_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicFecGroup);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_FEC_GROUP_H_