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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_HPACK_OUTPUT_STREAM_H_ | |
6 #define NET_SPDY_HPACK_HPACK_OUTPUT_STREAM_H_ | |
7 | |
8 #include <stddef.h> | |
9 #include <stdint.h> | |
10 | |
11 #include <map> | |
12 | |
13 #include "base/macros.h" | |
14 #include "net/base/net_export.h" | |
15 #include "net/spdy/hpack/hpack_constants.h" | |
16 #include "net/spdy/platform/api/spdy_string.h" | |
17 #include "net/spdy/platform/api/spdy_string_piece.h" | |
18 | |
19 // All section references below are to | |
20 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 | |
21 | |
22 namespace net { | |
23 | |
24 // An HpackOutputStream handles all the low-level details of encoding | |
25 // header fields. | |
26 class NET_EXPORT_PRIVATE HpackOutputStream { | |
27 public: | |
28 HpackOutputStream(); | |
29 ~HpackOutputStream(); | |
30 | |
31 // Appends the lower |bit_size| bits of |bits| to the internal buffer. | |
32 // | |
33 // |bit_size| must be > 0 and <= 8. |bits| must not have any bits | |
34 // set other than the lower |bit_size| bits. | |
35 void AppendBits(uint8_t bits, size_t bit_size); | |
36 | |
37 // Simply forwards to AppendBits(prefix.bits, prefix.bit-size). | |
38 void AppendPrefix(HpackPrefix prefix); | |
39 | |
40 // Directly appends |buffer|. | |
41 void AppendBytes(SpdyStringPiece buffer); | |
42 | |
43 // Appends the given integer using the representation described in | |
44 // 6.1. If the internal buffer ends on a byte boundary, the prefix | |
45 // length N is taken to be 8; otherwise, it is taken to be the | |
46 // number of bits to the next byte boundary. | |
47 // | |
48 // It is guaranteed that the internal buffer will end on a byte | |
49 // boundary after this function is called. | |
50 void AppendUint32(uint32_t I); | |
51 | |
52 // Swaps the internal buffer with |output|, then resets state. | |
53 void TakeString(SpdyString* output); | |
54 | |
55 // Gives up to |max_size| bytes of the internal buffer to |output|. Resets | |
56 // internal state with the overflow. | |
57 void BoundedTakeString(size_t max_size, SpdyString* output); | |
58 | |
59 // Size in bytes of stream's internal buffer. | |
60 size_t size() const { return buffer_.size(); } | |
61 | |
62 // Returns the estimate of dynamically allocated memory in bytes. | |
63 size_t EstimateMemoryUsage() const; | |
64 | |
65 private: | |
66 // The internal bit buffer. | |
67 SpdyString buffer_; | |
68 | |
69 // If 0, the buffer ends on a byte boundary. If non-zero, the buffer | |
70 // ends on the nth most significant bit. Guaranteed to be < 8. | |
71 size_t bit_offset_; | |
72 | |
73 DISALLOW_COPY_AND_ASSIGN(HpackOutputStream); | |
74 }; | |
75 | |
76 } // namespace net | |
77 | |
78 #endif // NET_SPDY_HPACK_HPACK_OUTPUT_STREAM_H_ | |
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