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      1 // Copyright 2014 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_SPDY_SPDY_PREFIXED_BUFFER_READER_H_
      6 #define NET_SPDY_SPDY_PREFIXED_BUFFER_READER_H_
      7 
      8 #include "net/base/net_export.h"
      9 #include "net/spdy/spdy_pinnable_buffer_piece.h"
     10 
     11 namespace net {
     12 
     13 // Reader class which simplifies reading contiguously from
     14 // from a disjoint buffer prefix & suffix.
     15 class NET_EXPORT_PRIVATE SpdyPrefixedBufferReader {
     16  public:
     17   SpdyPrefixedBufferReader(const char* prefix, size_t prefix_length,
     18                            const char* suffix, size_t suffix_length);
     19 
     20   // Returns number of bytes available to be read.
     21   size_t Available();
     22 
     23   // Reads |count| bytes, copying into |*out|. Returns true on success,
     24   // false if not enough bytes were available.
     25   bool ReadN(size_t count, char* out);
     26 
     27   // Reads |count| bytes, returned in |*out|. Returns true on success,
     28   // false if not enough bytes were available.
     29   bool ReadN(size_t count, SpdyPinnableBufferPiece* out);
     30 
     31  private:
     32   const char* prefix_;
     33   const char* suffix_;
     34 
     35   size_t prefix_length_;
     36   size_t suffix_length_;
     37 };
     38 
     39 }  // namespace net
     40 
     41 #endif  // NET_SPDY_SPDY_PREFIXED_BUFFER_READER_H_
     42