Send PING to check the status of the SPDY connection.

net/spdy/spdy_framer.cc

 // Copyright (c) 2011 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 817 matching lines @@
         reinterpret_cast<const SpdyControlFrame&>(frame);
     return control_frame.type() == SYN_STREAM ||
            control_frame.type() == SYN_REPLY;
   }
 
   const SpdyDataFrame& data_frame =
       reinterpret_cast<const SpdyDataFrame&>(frame);
   return (data_frame.flags() & DATA_FLAG_COMPRESSED) != 0;
 }
 
+bool SpdyFramer::IsPingFrame(const SpdyFrame& frame) const {
+  if (frame.is_control_frame()) {
+    const SpdyControlFrame& control_frame =
+        reinterpret_cast<const SpdyControlFrame&>(frame);
+    return control_frame.type() == PING;
+  }
+  return false;
+}
+
 const char* SpdyFramer::StateToString(int state) {
   switch (state) {
     case SPDY_ERROR:
       return "ERROR";
     case SPDY_DONE:
       return "DONE";
     case SPDY_AUTO_RESET:
       return "AUTO_RESET";
     case SPDY_RESET:
       return "RESET";
@@ skipping 843 matching lines @@
   } else {
     frame_size = SpdyFrame::size();
     *header_length = frame_size;
     *payload_length = frame.length();
     *payload = frame.data() + SpdyFrame::size();
   }
   return true;
 }
 
 }  // namespace spdy