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_PINNABLE_BUFFER_PIECE_H_ 6 #define NET_SPDY_SPDY_PINNABLE_BUFFER_PIECE_H_ 7 8 #include <memory> 9 10 #include "base/memory/scoped_ptr.h" 11 #include "base/strings/string_piece.h" 12 #include "net/base/net_export.h" 13 14 namespace net { 15 16 class SpdyPrefixedBufferReader; 17 18 // Helper class of SpdyPrefixedBufferReader. 19 // Represents a piece of consumed buffer which may (or may not) own its 20 // underlying storage. Users may "pin" the buffer at a later time to ensure 21 // a SpdyPinnableBufferPiece owns and retains storage of the buffer. 22 struct NET_EXPORT_PRIVATE SpdyPinnableBufferPiece { 23 public: 24 SpdyPinnableBufferPiece(); 25 ~SpdyPinnableBufferPiece(); 26 27 const char * buffer() const { 28 return buffer_; 29 } 30 31 size_t length() const { 32 return length_; 33 } 34 35 operator base::StringPiece() const { 36 return base::StringPiece(buffer_, length_); 37 } 38 39 // Allocates and copies the buffer to internal storage. 40 void Pin(); 41 42 bool IsPinned() const { 43 return storage_.get() != NULL; 44 } 45 46 // Swaps buffers, including internal storage, with |other|. 47 void Swap(SpdyPinnableBufferPiece* other); 48 49 private: 50 friend class SpdyPrefixedBufferReader; 51 52 const char * buffer_; 53 size_t length_; 54 // Null iff |buffer_| isn't pinned. 55 scoped_ptr<char[]> storage_; 56 }; 57 58 } // namespace net 59 60 #endif // NET_SPDY_SPDY_PINNABLE_BUFFER_PIECE_H_ 61
