Land Recent QUIC changes

net/quic/quic_spdy_decompressor.h

+// 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.
+
+#ifndef NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_
+#define NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/quic/quic_protocol.h"
+#include "net/spdy/spdy_framer.h"
+
+namespace net {
+
+class SpdyFramerVisitor;
+
+// Handles the compression of request/response headers blocks.
+class NET_EXPORT_PRIVATE QuicSpdyDecompressor {
+ public:
+  // Interface that receives callbacks with decompressed data as it
+  // becomes available.
+  class NET_EXPORT_PRIVATE Visitor {
+   public:
+    virtual ~Visitor() {}
+    virtual bool OnDecompressedData(base::StringPiece data) = 0;
+  };
+
+  QuicSpdyDecompressor();
+  ~QuicSpdyDecompressor();
+
+  // Decompresses the data in |data| and invokes |OnDecompressedData|,
+  // possibly multiple times, on |visitor|.  Returns number of bytes
+  // consumed from |data|.
+  size_t DecompressData(base::StringPiece data, Visitor* visitor);
+
+  QuicHeaderId current_header_id() { return current_header_id_; }
+
+ private:
+  void ResetForNextHeaders();
+
+  SpdyFramer spdy_framer_;
+  scoped_ptr<SpdyFramerVisitor> spdy_visitor_;
+  // ID of the header currently being parsed.
+  QuicHeaderId current_header_id_;
+  // True when the size of the headers has been parsed.
+  bool has_current_compressed_size_;
+  // Size of the headers being parsed.
+  uint32 current_compressed_size_;
+  // Buffer into which the partial compressed size is written until
+  // it is fully parsed.
+  std::string compressed_size_buffer_;
+  // Number of compressed bytes consumed, out of the total in
+  // |current_compressed_size_|.
+  uint32 compressed_bytes_consumed_;
+  DISALLOW_COPY_AND_ASSIGN(QuicSpdyDecompressor);
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_