Allow 0-RTT handshakes for QUIC HTTPS requests.

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_
 
-#include <set>
-
 #include "base/strings/string_piece.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 class NET_EXPORT_PRIVATE QuicFecGroup {
  public:
   QuicFecGroup();
   ~QuicFecGroup();
 
-  // 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,
+  // Updates the FEC group based on the delivery of a data packet decrypted at
+  // |encryption_level|. Returns false if this packet has already been seen,
+  // true otherwise.
+  bool Update(EncryptionLevel encryption_level,
+              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,
+  // Updates the FEC group based on the delivery of an FEC packet decrypted at
+  // |encryption_level|. 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.
+  bool UpdateFec(EncryptionLevel encryption_level,
+                 QuicPacketSequenceNumber fec_packet_sequence_number,
                  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
@@ skipping 13 matching lines @@
   }
 
   QuicPacketSequenceNumber min_protected_packet() const {
     return min_protected_packet_;
   }
 
   size_t NumReceivedPackets() const {
     return received_packets_.size();
   }
 
+  // Returns the effective encryption level of the FEC group.
+  EncryptionLevel effective_encryption_level() const {
+    return effective_encryption_level_;
+  }
+
  private:
   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_;
+  // The effective encryption level, which is the lowest encryption level of
+  // the data and FEC in the group.
+  EncryptionLevel effective_encryption_level_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicFecGroup);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_FEC_GROUP_H_