Fixes for re-enabling more MSVC level 4 warnings: net/quic/ edition

net/quic/crypto/crypto_protocol.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.
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 #define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 
 #include <string>
 
 #include "net/base/net_export.h"
 #include "net/quic/quic_protocol.h"
 
 // Version and Crypto tags are written to the wire with a big-endian
 // representation of the name of the tag.  For example
 // the client hello tag (CHLO) will be written as the
 // following 4 bytes: 'C' 'H' 'L' 'O'.  Since it is
 // stored in memory as a little endian uint32, we need
 // to reverse the order of the bytes.
 //
 // We use a macro to ensure that no static initialisers are created. Use the
 // MakeQuicTag function in normal code.
-#define TAG(a, b, c, d) ((d << 24) + (c << 16) + (b << 8) + a)
+#define TAG(a, b, c, d) \
+    static_cast<QuicTag>((d << 24) + (c << 16) + (b << 8) + a)
 
 namespace net {
 
 typedef std::string ServerConfigID;
 
 const QuicTag kCHLO = TAG('C', 'H', 'L', 'O');   // Client hello
 const QuicTag kSHLO = TAG('S', 'H', 'L', 'O');   // Server hello
 const QuicTag kSCFG = TAG('S', 'C', 'F', 'G');   // Server config
 const QuicTag kREJ  = TAG('R', 'E', 'J', '\0');  // Reject
 const QuicTag kCETV = TAG('C', 'E', 'T', 'V');   // Client encrypted tag-value
@@ skipping 127 matching lines @@
 // amplification factor of any mirror DoS attack.
 //
 // A client may pad an inchoate client hello to a size larger than
 // kClientHelloMinimumSize to make it more likely to receive a complete
 // rejection message.
 const size_t kClientHelloMinimumSize = 1024;
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_