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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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