Land Recent QUIC changes

net/quic/quic_spdy_compressor.cc

+// Copyright (c) 2013 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.
+
+#include "net/quic/quic_spdy_compressor.h"
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+using std::string;
+
+namespace net {
+
+QuicSpdyCompressor::QuicSpdyCompressor()
+    : spdy_framer_(3),
+      header_sequence_id_(1) {
+  spdy_framer_.set_enable_compression(true);
+}
+
+QuicSpdyCompressor::~QuicSpdyCompressor() {
+}
+
+string QuicSpdyCompressor::CompressHeaders(
+    const SpdyHeaderBlock& headers) {
+  // TODO(rch): Modify the SpdyFramer to expose a
+  // CreateCompressedHeaderBlock method, or some such.
+  SpdyStreamId stream_id = 3;    // unused.
+  scoped_ptr<SpdyFrame> frame(spdy_framer_.CreateHeaders(
+      stream_id, CONTROL_FLAG_NONE, true, &headers));
+
+  // The size of the spdy HEADER frame's fixed prefix which
+  // needs to be stripped off from the resulting frame.
+  const size_t header_frame_prefix_len = 12;
+  string serialized = string(frame->data() + header_frame_prefix_len,
+                             frame->size() - header_frame_prefix_len);
+  uint32 serialized_len = serialized.length();
+  char id_str[sizeof(header_sequence_id_)];
+  memcpy(&id_str, &header_sequence_id_, sizeof(header_sequence_id_));
+  char len_str[sizeof(serialized_len)];
+  memcpy(&len_str, &serialized_len, sizeof(serialized_len));
+  string compressed;
+  compressed.reserve(arraysize(id_str) + arraysize(len_str) + serialized_len);
+  compressed.append(id_str, arraysize(id_str));
+  compressed.append(len_str, arraysize(len_str));
+  compressed.append(serialized);
+  ++header_sequence_id_;
+  return compressed;
+}
+
+}  // namespace net