SPDY: Use SpdyMajorVersion rather than ints for SPDY version number.

net/spdy/spdy_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.
 
 // This file contains some protocol structures for use with SPDY 2 and 3
 // The SPDY 2 spec can be found at:
 // http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2
 // The SPDY 3 spec can be found at:
 // http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3
 
@@ skipping 10 matching lines @@
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/sys_byteorder.h"
 #include "net/base/net_export.h"
 #include "net/spdy/spdy_bitmasks.h"
 
 namespace net {
 
 // The major versions of SPDY. Major version differences indicate
 // framer-layer incompatibility, as opposed to minor version numbers
-// which indicate application-layer incompatibility. It is guaranteed
-// that the enum value SPDYn maps to the integer n.
+// which indicate application-layer incompatibility. Do not rely on
+// the mapping from enum value SPDYn to the integer n.
 enum SpdyMajorVersion {
   SPDY2 = 2,
   SPDY_MIN_VERSION = SPDY2,
   SPDY3 = 3,
   SPDY4 = 4,
-  SPDY_MAX_VERSION = SPDY4
+  SPDY5 = 5,
+  SPDY_MAX_VERSION = SPDY5
 };
 
 // A SPDY stream id is a 31 bit entity.
 typedef uint32 SpdyStreamId;
 
 // Specifies the stream ID used to denote the current session (for
 // flow control).
 const SpdyStreamId kSessionFlowControlStreamId = 0;
 
 // Initial window size for a Spdy stream in bytes.
@@ skipping 434 matching lines @@
   // will likely vary this, so we allow for the flexibility of a function call
   // for this value as opposed to a constant.
   static size_t GetDataFrameMinimumSize();
 
   // Size, in bytes, of the control frame header.
   static size_t GetControlFrameHeaderSize(SpdyMajorVersion version);
 
   static size_t GetPrefixLength(SpdyFrameType type, SpdyMajorVersion version);
 
   static size_t GetFrameMaximumSize(SpdyMajorVersion version);
+
+  static SpdyMajorVersion ParseMajorVersion(int version_number);
+
+  static int SerializeMajorVersion(SpdyMajorVersion version);
+
+  static std::string GetVersionString(SpdyMajorVersion version);
 };
 
 class SpdyFrame;
 typedef SpdyFrame SpdySerializedFrame;
 
 class SpdyFrameVisitor;
 
 // Intermediate representation for SPDY frames.
 // TODO(hkhalil): Rename this class to SpdyFrame when the existing SpdyFrame is
 // gone.
@@ skipping 474 matching lines @@
   SpdyFrameVisitor() {}
   virtual ~SpdyFrameVisitor() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SpdyFrameVisitor);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_PROTOCOL_H_