Introduce new SpdyConstants class

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 366 matching lines @@
 
 // A SPDY priority is a number between 0 and 7 (inclusive).
 // SPDY priority range is version-dependent. For SPDY 2 and below, priority is a
 // number between 0 and 3.
 typedef uint8 SpdyPriority;
 
 typedef std::map<std::string, std::string> SpdyNameValueBlock;
 
 typedef uint64 SpdyPingId;
 
+// TODO(hkhalil): Add direct testing for this? It won't increase coverage any,
+// but is good to do anyway.
+class SpdyConstants {
+ public:
+  // Returns true if a given on-the-wire enumeration of a frame type is valid
+  // for a given protocol version, false otherwise.
+  static bool IsValidFrameType(SpdyMajorVersion version, int frame_type_field);
+
+  // Parses a frame type from an on-the-wire enumeration of a given protocol
+  // version.
+  // Behavior is undefined for invalid frame type fields; consumers should first
+  // use IsValidFrameType() to verify validity of frame type fields.
+  static SpdyFrameType ParseFrameType(SpdyMajorVersion version,
+                                      int frame_type_field);
+
+  // Serializes a given frame type to the on-the-wire enumeration value for the
+  // given protocol version.
+  // Returns -1 on failure (I.E. Invalid frame type for the given version).
+  static int SerializeFrameType(SpdyMajorVersion version,
+                                SpdyFrameType frame_type);
+};
+
 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.
 class NET_EXPORT_PRIVATE SpdyFrameIR {
  public:
@@ skipping 473 matching lines @@
   SpdyFrameVisitor() {}
   virtual ~SpdyFrameVisitor() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SpdyFrameVisitor);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_PROTOCOL_H_