Add helper function for SPDY 4

net/spdy/spdy_framer.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.
 
 // TODO(rtenhove) clean up frame buffer size calculations so that we aren't
 // constantly adding and subtracting header sizes; this is ugly and error-
 // prone.
 
 #include "net/spdy/spdy_framer.h"
 
@@ skipping 235 matching lines @@
   return GetControlFrameHeaderSize() + 8;
 }
 
 size_t SpdyFramer::GetCredentialMinimumSize() const {
   // Size, in bytes, of a CREDENTIAL frame sans variable-length certificate list
   // and proof. Calculated as:
   // control frame header + 2 (slot)
   return GetControlFrameHeaderSize() + 2;
 }
 
+size_t SpdyFramer::GetDataFrameMaximumPayload() const {
+  if (protocol_version() < 4) {
+    return 0xffffff - GetDataFrameMinimumSize();

[Ryan Hamilton, 2013/04/08 16:11:45]

I really think these values should be constants which comments.  For some
reason, hkhalil seems allergic to this appoach, however.

+  }
+  return 0xffff - GetDataFrameMinimumSize();
+}
+
 const char* SpdyFramer::StateToString(int state) {
   switch (state) {
     case SPDY_ERROR:
       return "ERROR";
     case SPDY_AUTO_RESET:
       return "AUTO_RESET";
     case SPDY_RESET:
       return "RESET";
     case SPDY_READING_COMMON_HEADER:
       return "READING_COMMON_HEADER";
@@ skipping 1781 matching lines @@
   post_compress_bytes.Add(compressed_size);
 
   compressed_frames.Increment();
 
   if (debug_visitor_ != NULL) {
     debug_visitor_->OnCompressedHeaderBlock(uncompressed_len, compressed_size);
   }
 }
 
 }  // namespace net