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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_HPACK_OUTPUT_STREAM_H_ | |
6 #define NET_SPDY_HPACK_OUTPUT_STREAM_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 | |
11 #include "base/basictypes.h" | |
12 #include "base/macros.h" | |
13 #include "base/strings/string_piece.h" | |
14 #include "net/base/net_export.h" | |
15 #include "net/spdy/hpack_constants.h" | |
16 | |
17 // All section references below are to | |
18 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 | |
19 | |
20 namespace net { | |
21 | |
22 // An HpackOutputStream handles all the low-level details of encoding | |
23 // header fields. | |
24 class NET_EXPORT_PRIVATE HpackOutputStream { | |
25 public: | |
26 explicit HpackOutputStream(); | |
27 ~HpackOutputStream(); | |
28 | |
29 // Appends the lower |bit_size| bits of |bits| to the internal buffer. | |
30 // | |
31 // |bit_size| must be > 0 and <= 8. |bits| must not have any bits | |
32 // set other than the lower |bit_size| bits. | |
33 void AppendBits(uint8 bits, size_t bit_size); | |
34 | |
35 // Simply forwards to AppendBits(prefix.bits, prefix.bit-size). | |
36 void AppendPrefix(HpackPrefix prefix); | |
37 | |
38 // Directly appends |buffer|. | |
39 void AppendBytes(base::StringPiece buffer); | |
40 | |
41 // Appends the given integer using the representation described in | |
42 // 6.1. If the internal buffer ends on a byte boundary, the prefix | |
43 // length N is taken to be 8; otherwise, it is taken to be the | |
44 // number of bits to the next byte boundary. | |
45 // | |
46 // It is guaranteed that the internal buffer will end on a byte | |
47 // boundary after this function is called. | |
48 void AppendUint32(uint32 I); | |
49 | |
50 // Swaps the interal buffer with |output|. | |
51 void TakeString(std::string* output); | |
52 | |
53 private: | |
54 // The internal bit buffer. | |
55 std::string buffer_; | |
56 | |
57 // If 0, the buffer ends on a byte boundary. If non-zero, the buffer | |
58 // ends on the most significant nth bit. Guaranteed to be < 8. | |
59 size_t bit_offset_; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(HpackOutputStream); | |
62 }; | |
63 | |
64 } // namespace net | |
65 | |
66 #endif // NET_SPDY_HPACK_OUTPUT_STREAM_H_ | |
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