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