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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_COMPRESSOR_H_
      6 #define NET_QUIC_QUIC_SPDY_COMPRESSOR_H_
      7 
      8 #include <string>
      9 
     10 #include "net/base/net_export.h"
     11 #include "net/quic/quic_protocol.h"
     12 #include "net/spdy/spdy_framer.h"
     13 
     14 namespace net {
     15 
     16 // Handles the compression of request/response headers blocks.  The
     17 // serialized format is:
     18 // uint32 - Priority
     19 // uint32 - Header ID
     20 // uint32 - Compressed header length
     21 // ... - Compressed data
     22 //
     23 class NET_EXPORT_PRIVATE QuicSpdyCompressor {
     24  public:
     25   QuicSpdyCompressor();
     26   ~QuicSpdyCompressor();
     27 
     28   // Returns a string comprised of [header_sequence_id, compressed_headers].
     29   std::string CompressHeaders(const SpdyHeaderBlock& headers);
     30 
     31   // Returns a string comprised of
     32   // [priority, header_sequence_id, compressed_headers]
     33   std::string CompressHeadersWithPriority(QuicPriority priority,
     34                                           const SpdyHeaderBlock& headers);
     35 
     36  private:
     37   std::string CompressHeadersInternal(QuicPriority priority,
     38                                       const SpdyHeaderBlock& headers,
     39                                       bool write_priority);
     40 
     41   SpdyFramer spdy_framer_;
     42   QuicHeaderId header_sequence_id_;
     43 
     44   DISALLOW_COPY_AND_ASSIGN(QuicSpdyCompressor);
     45 };
     46 
     47 }  // namespace net
     48 
     49 #endif  // NET_QUIC_QUIC_SPDY_COMPRESSOR_H_
     50