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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "net/quic/quic_fec_group.h" | 5 #include "net/quic/quic_fec_group.h" |
| 6 | 6 |
| 7 #include <limits> | 7 #include <limits> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 | 10 |
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| 42 } | 42 } |
| 43 if (!UpdateParity(decrypted_payload, header.entropy_flag)) { | 43 if (!UpdateParity(decrypted_payload, header.entropy_flag)) { |
| 44 return false; | 44 return false; |
| 45 } | 45 } |
| 46 received_packets_.insert(header.packet_sequence_number); | 46 received_packets_.insert(header.packet_sequence_number); |
| 47 return true; | 47 return true; |
| 48 } | 48 } |
| 49 | 49 |
| 50 bool QuicFecGroup::UpdateFec( | 50 bool QuicFecGroup::UpdateFec( |
| 51 QuicPacketSequenceNumber fec_packet_sequence_number, | 51 QuicPacketSequenceNumber fec_packet_sequence_number, |
| 52 bool fec_entropy_flag, | 52 bool fec_packet_entropy, |
| 53 const QuicFecData& fec) { | 53 const QuicFecData& fec) { |
| 54 if (min_protected_packet_ != kNoSequenceNumber) { | 54 if (min_protected_packet_ != kNoSequenceNumber) { |
| 55 return false; | 55 return false; |
| 56 } | 56 } |
| 57 SequenceNumberSet::const_iterator it = received_packets_.begin(); | 57 SequenceNumberSet::const_iterator it = received_packets_.begin(); |
| 58 while (it != received_packets_.end()) { | 58 while (it != received_packets_.end()) { |
| 59 if ((*it < fec.fec_group) || | 59 if ((*it < fec.fec_group) || |
| 60 (*it >= fec_packet_sequence_number)) { | 60 (*it >= fec_packet_sequence_number)) { |
| 61 DLOG(ERROR) << "FEC group does not cover received packet: " << *it; | 61 DLOG(ERROR) << "FEC group does not cover received packet: " << *it; |
| 62 return false; | 62 return false; |
| 63 } | 63 } |
| 64 ++it; | 64 ++it; |
| 65 } | 65 } |
| 66 if (!UpdateParity(fec.redundancy, fec_entropy_flag)) { | 66 if (!UpdateParity(fec.redundancy, fec_packet_entropy)) { |
| 67 return false; | 67 return false; |
| 68 } | 68 } |
| 69 min_protected_packet_ = fec.fec_group; | 69 min_protected_packet_ = fec.fec_group; |
| 70 max_protected_packet_ = fec_packet_sequence_number - 1; | 70 max_protected_packet_ = fec_packet_sequence_number - 1; |
| 71 return true; | 71 return true; |
| 72 } | 72 } |
| 73 | 73 |
| 74 bool QuicFecGroup::CanRevive() const { | 74 bool QuicFecGroup::CanRevive() const { |
| 75 // We can revive if we're missing exactly 1 packet. | 75 // We can revive if we're missing exactly 1 packet. |
| 76 return NumMissingPackets() == 1; | 76 return NumMissingPackets() == 1; |
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| 157 } | 157 } |
| 158 | 158 |
| 159 size_t QuicFecGroup::NumMissingPackets() const { | 159 size_t QuicFecGroup::NumMissingPackets() const { |
| 160 if (min_protected_packet_ == kNoSequenceNumber) | 160 if (min_protected_packet_ == kNoSequenceNumber) |
| 161 return numeric_limits<size_t>::max(); | 161 return numeric_limits<size_t>::max(); |
| 162 return (max_protected_packet_ - min_protected_packet_ + 1) - | 162 return (max_protected_packet_ - min_protected_packet_ + 1) - |
| 163 received_packets_.size(); | 163 received_packets_.size(); |
| 164 } | 164 } |
| 165 | 165 |
| 166 } // namespace net | 166 } // namespace net |
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