Minor cleanup and optimization of QuicConnection::IsConnectionClose.

net/quic/quic_connection.cc

 // 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.
 
 #include "net/quic/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 1385 matching lines @@
   packet->serialized_packet.packet = nullptr;
   return true;
 }
 
 bool QuicConnection::WritePacketInner(QueuedPacket* packet) {
   if (ShouldDiscardPacket(*packet)) {
     ++stats_.packets_discarded;
     return true;
   }
   // Connection close packets are encrypted and saved, so don't exit early.
-  if (writer_->IsWriteBlocked() && !IsConnectionClose(*packet)) {
+  const bool is_connection_close = IsConnectionClose(*packet);
+  if (writer_->IsWriteBlocked() && !is_connection_close) {
     return false;
   }
 
   QuicPacketSequenceNumber sequence_number =
       packet->serialized_packet.sequence_number;
   DCHECK_LE(sequence_number_of_last_sent_packet_, sequence_number);
   sequence_number_of_last_sent_packet_ = sequence_number;
 
   QuicEncryptedPacket* encrypted = framer_.EncryptPacket(
       packet->encryption_level,
       sequence_number,
       *packet->serialized_packet.packet);
   if (encrypted == nullptr) {
     LOG(DFATAL) << ENDPOINT << "Failed to encrypt packet number "
                 << sequence_number;
     // CloseConnection does not send close packet, so no infinite loop here.
     CloseConnection(QUIC_ENCRYPTION_FAILURE, false);
     return false;
   }
 
   // Connection close packets are eventually owned by TimeWaitListManager.
   // Others are deleted at the end of this call.
   scoped_ptr<QuicEncryptedPacket> encrypted_deleter;
-  if (IsConnectionClose(*packet)) {
+  if (is_connection_close) {
     DCHECK(connection_close_packet_.get() == nullptr);
     connection_close_packet_.reset(encrypted);
     // This assures we won't try to write *forced* packets when blocked.
     // Return true to stop processing.
     if (writer_->IsWriteBlocked()) {
       visitor_->OnWriteBlocked();
       return true;
     }
   } else {
     encrypted_deleter.reset(encrypted);
@@ skipping 656 matching lines @@
   // Retransmitted packets retransmittable frames are owned by the unacked
   // packet map, but are not present in the serialized packet.
   if (packet.transmission_type != NOT_RETRANSMISSION ||
       packet.serialized_packet.retransmittable_frames != nullptr) {
     return HAS_RETRANSMITTABLE_DATA;
   } else {
     return NO_RETRANSMITTABLE_DATA;
   }
 }
 
-bool QuicConnection::IsConnectionClose(
-    QueuedPacket packet) {
-  RetransmittableFrames* retransmittable_frames =
+bool QuicConnection::IsConnectionClose(const QueuedPacket& packet) {
+  const RetransmittableFrames* retransmittable_frames =
       packet.serialized_packet.retransmittable_frames;
-  if (!retransmittable_frames) {
+  if (retransmittable_frames == nullptr) {
     return false;
   }
-  for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) {
-    if (retransmittable_frames->frames()[i].type == CONNECTION_CLOSE_FRAME) {
+  for (const QuicFrame& frame : retransmittable_frames->frames()) {
+    if (frame.type == CONNECTION_CLOSE_FRAME) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net