In QUIC v39, read and write integers and floating numbers in big endian.

net/quic/core/quic_packet_creator.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/core/quic_packet_creator.h"
 
 #include <algorithm>
 #include <cstdint>
 
 #include "base/macros.h"
@@ skipping 349 matching lines @@
     QuicStreamOffset stream_offset,
     bool fin,
     QuicReferenceCountedPointer<QuicAckListenerInterface> ack_listener,
     size_t* num_bytes_consumed) {
   DCHECK(queued_frames_.empty());
   // Write out the packet header
   QuicPacketHeader header;
   FillPacketHeader(&header);
   QUIC_CACHELINE_ALIGNED char encrypted_buffer[kMaxPacketSize];
   QuicDataWriter writer(arraysize(encrypted_buffer), encrypted_buffer,
-                        framer_->perspective(), HOST_BYTE_ORDER);
+                        framer_->perspective(), framer_->endianness());
   if (!framer_->AppendPacketHeader(header, &writer)) {
     QUIC_BUG << "AppendPacketHeader failed";
     return;
   }
 
   // Create a Stream frame with the remaining space.
   QUIC_BUG_IF(iov_offset == iov.total_length && !fin)
       << "Creating a stream frame with no data or fin.";
   const size_t remaining_data_size = iov.total_length - iov_offset;
   const size_t min_frame_size = QuicFramer::GetMinStreamFrameSize(
@@ skipping 276 matching lines @@
 bool QuicPacketCreator::IncludeNonceInPublicHeader() {
   return have_diversification_nonce_ &&
          packet_.encryption_level == ENCRYPTION_INITIAL;
 }
 
 void QuicPacketCreator::AddPendingPadding(QuicByteCount size) {
   pending_padding_bytes_ += size;
 }
 
 }  // namespace net