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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // SdchFilter applies open_vcdiff content decoding to a datastream. | 5 // SdchFilter applies open_vcdiff content decoding to a datastream. |
6 // This decoding uses a pre-cached dictionary of text fragments to decode | 6 // This decoding uses a pre-cached dictionary of text fragments to decode |
7 // (expand) the stream back to its original contents. | 7 // (expand) the stream back to its original contents. |
8 // | 8 // |
9 // This SdchFilter internally uses open_vcdiff/vcdec library to do decoding. | 9 // This SdchFilter internally uses open_vcdiff/vcdec library to do decoding. |
10 // | 10 // |
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57 explicit SdchFilter(const FilterContext& filter_context); | 57 explicit SdchFilter(const FilterContext& filter_context); |
58 friend class Filter; | 58 friend class Filter; |
59 | 59 |
60 // Identify the suggested dictionary, and initialize underlying decompressor. | 60 // Identify the suggested dictionary, and initialize underlying decompressor. |
61 Filter::FilterStatus InitializeDictionary(); | 61 Filter::FilterStatus InitializeDictionary(); |
62 | 62 |
63 // Move data that was internally buffered (after decompression) to the | 63 // Move data that was internally buffered (after decompression) to the |
64 // specified dest_buffer. | 64 // specified dest_buffer. |
65 int OutputBufferExcess(char* const dest_buffer, size_t available_space); | 65 int OutputBufferExcess(char* const dest_buffer, size_t available_space); |
66 | 66 |
67 // Add SDCH Problem to net-log and record histogram. | |
68 void LogSdchProblem(SdchProblemCode problem); | |
69 | |
70 // Context data from the owner of this filter. | 67 // Context data from the owner of this filter. |
71 const FilterContext& filter_context_; | 68 const FilterContext& filter_context_; |
72 | 69 |
73 // Tracks the status of decoding. | 70 // Tracks the status of decoding. |
74 // This variable is initialized by InitDecoding and updated only by | 71 // This variable is initialized by InitDecoding and updated only by |
75 // ReadFilteredData. | 72 // ReadFilteredData. |
76 DecodingStatus decoding_status_; | 73 DecodingStatus decoding_status_; |
77 | 74 |
78 // The underlying decoder that processes data. | 75 // The underlying decoder that processes data. |
79 // This data structure is initialized by InitDecoding and updated in | 76 // This data structure is initialized by InitDecoding and updated in |
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128 // To facilitate error recovery, allow filter to know if content is text/html | 125 // To facilitate error recovery, allow filter to know if content is text/html |
129 // by checking within this mime type (we may do a meta-refresh via html). | 126 // by checking within this mime type (we may do a meta-refresh via html). |
130 std::string mime_type_; | 127 std::string mime_type_; |
131 | 128 |
132 DISALLOW_COPY_AND_ASSIGN(SdchFilter); | 129 DISALLOW_COPY_AND_ASSIGN(SdchFilter); |
133 }; | 130 }; |
134 | 131 |
135 } // namespace net | 132 } // namespace net |
136 | 133 |
137 #endif // NET_FILTER_SDCH_FILTER_H_ | 134 #endif // NET_FILTER_SDCH_FILTER_H_ |
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