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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_
      6 #define NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/strings/string_piece.h"
     13 #include "net/base/net_export.h"
     14 #include "net/quic/quic_protocol.h"
     15 #include "net/spdy/spdy_framer.h"
     16 
     17 namespace net {
     18 
     19 class SpdyFramerVisitor;
     20 
     21 // Handles the compression of request/response headers blocks.
     22 class NET_EXPORT_PRIVATE QuicSpdyDecompressor {
     23  public:
     24   // Interface that receives callbacks with decompressed data as it
     25   // becomes available.
     26   class NET_EXPORT_PRIVATE Visitor {
     27    public:
     28     virtual ~Visitor() {}
     29     virtual bool OnDecompressedData(base::StringPiece data) = 0;
     30     virtual void OnDecompressionError() = 0;
     31   };
     32 
     33   QuicSpdyDecompressor();
     34   ~QuicSpdyDecompressor();
     35 
     36   // Decompresses the data in |data| and invokes |OnDecompressedData|,
     37   // possibly multiple times, on |visitor|.  Returns number of bytes
     38   // consumed from |data|.
     39   size_t DecompressData(base::StringPiece data, Visitor* visitor);
     40 
     41   QuicHeaderId current_header_id() { return current_header_id_; }
     42 
     43  private:
     44   void ResetForNextHeaders();
     45 
     46   SpdyFramer spdy_framer_;
     47   scoped_ptr<SpdyFramerVisitor> spdy_visitor_;
     48   // ID of the header currently being parsed.
     49   QuicHeaderId current_header_id_;
     50   // True when the size of the headers has been parsed.
     51   bool has_current_compressed_size_;
     52   // Size of the headers being parsed.
     53   uint32 current_compressed_size_;
     54   // Buffer into which the partial compressed size is written until
     55   // it is fully parsed.
     56   std::string compressed_size_buffer_;
     57   // Number of compressed bytes consumed, out of the total in
     58   // |current_compressed_size_|.
     59   uint32 compressed_bytes_consumed_;
     60   DISALLOW_COPY_AND_ASSIGN(QuicSpdyDecompressor);
     61 };
     62 
     63 }  // namespace net
     64 
     65 #endif  // NET_QUIC_QUIC_SPDY_DECOMPRESSOR_H_
     66