HPACK: Implement delta encoding.

net/spdy/spdy_framer.cc

Index: net/spdy/spdy_framer.cc
diff --git a/net/spdy/spdy_framer.cc b/net/spdy/spdy_framer.cc
index c0f214cb15d0db883431c22d3e4fc6bc88e25d02..f0efd0447bd5b538d668064d0e9f5bf9d9c46ba4 100644
--- a/net/spdy/spdy_framer.cc
+++ b/net/spdy/spdy_framer.cc
@@ -124,6 +124,7 @@ bool SpdyFramerVisitorInterface::OnRstStreamFrameData(
 SpdyFramer::SpdyFramer(SpdyMajorVersion version)
     : current_frame_buffer_(new char[kControlFrameBufferSize]),
       enable_compression_(true),
+      hpack_encoder_(ObtainHpackHuffmanTable()),
       hpack_decoder_(ObtainHpackHuffmanTable()),
       visitor_(NULL),
       debug_visitor_(NULL),
@@ -2163,8 +2164,13 @@ SpdySerializedFrame* SpdyFramer::SerializeSynStream(
 
   string hpack_encoding;
   if (protocol_version() > SPDY3) {
-    hpack_encoder_.EncodeHeaderSet(syn_stream.name_value_block(),
-                                   &hpack_encoding);
+    if (enable_compression_) {
+      hpack_encoder_.EncodeHeaderSet(
+          syn_stream.name_value_block(), &hpack_encoding);
+    } else {
+      hpack_encoder_.EncodeHeaderSetWithoutCompression(
+          syn_stream.name_value_block(), &hpack_encoding);
+    }
     size += hpack_encoding.size();
   } else {
     size += GetSerializedLength(syn_stream.name_value_block());
@@ -2223,8 +2229,13 @@ SpdySerializedFrame* SpdyFramer::SerializeSynReply(
 
   string hpack_encoding;
   if (protocol_version() > SPDY3) {
-    hpack_encoder_.EncodeHeaderSet(syn_reply.name_value_block(),
-                                   &hpack_encoding);
+    if (enable_compression_) {
+      hpack_encoder_.EncodeHeaderSet(
+          syn_reply.name_value_block(), &hpack_encoding);
+    } else {
+      hpack_encoder_.EncodeHeaderSetWithoutCompression(
+          syn_reply.name_value_block(), &hpack_encoding);
+    }
     size += hpack_encoding.size();
   } else {
     size += GetSerializedLength(syn_reply.name_value_block());
@@ -2442,7 +2453,13 @@ SpdySerializedFrame* SpdyFramer::SerializeHeaders(
 
   string hpack_encoding;
   if (protocol_version() > SPDY3) {
-    hpack_encoder_.EncodeHeaderSet(headers.name_value_block(), &hpack_encoding);
+    if (enable_compression_) {
+      hpack_encoder_.EncodeHeaderSet(
+          headers.name_value_block(), &hpack_encoding);
+    } else {
+      hpack_encoder_.EncodeHeaderSetWithoutCompression(
+          headers.name_value_block(), &hpack_encoding);
+    }
     size += hpack_encoding.size();
     if (size > GetControlFrameBufferMaxSize()) {
       size += GetNumberRequiredContinuationFrames(size) *
@@ -2533,8 +2550,13 @@ SpdyFrame* SpdyFramer::SerializePushPromise(
 
   string hpack_encoding;
   if (protocol_version() > SPDY3) {
-    hpack_encoder_.EncodeHeaderSet(push_promise.name_value_block(),
-                                   &hpack_encoding);
+    if (enable_compression_) {
+      hpack_encoder_.EncodeHeaderSet(
+          push_promise.name_value_block(), &hpack_encoding);
+    } else {
+      hpack_encoder_.EncodeHeaderSetWithoutCompression(
+          push_promise.name_value_block(), &hpack_encoding);
+    }
     size += hpack_encoding.size();
     if (size > GetControlFrameBufferMaxSize()) {
       size += GetNumberRequiredContinuationFrames(size) *
@@ -2588,8 +2610,13 @@ SpdyFrame* SpdyFramer::SerializeContinuation(
   // The size of this frame, including variable-length name-value block.
   size_t size = GetContinuationMinimumSize();
   string hpack_encoding;
-  hpack_encoder_.EncodeHeaderSet(continuation.name_value_block(),
-                                 &hpack_encoding);
+  if (enable_compression_) {
+    hpack_encoder_.EncodeHeaderSet(
+        continuation.name_value_block(), &hpack_encoding);
+  } else {
+    hpack_encoder_.EncodeHeaderSetWithoutCompression(
+        continuation.name_value_block(), &hpack_encoding);
+  }
   size += hpack_encoding.size();
 
   SpdyFrameBuilder builder(size, protocol_version());