/src/qpdf/libqpdf/SF_FlateLzwDecode.cc
Line | Count | Source |
1 | | #include <qpdf/SF_FlateLzwDecode.hh> |
2 | | |
3 | | #include <qpdf/Pl_Flate.hh> |
4 | | #include <qpdf/Pl_LZWDecoder.hh> |
5 | | #include <qpdf/Pl_PNGFilter.hh> |
6 | | #include <qpdf/Pl_TIFFPredictor.hh> |
7 | | #include <qpdf/QIntC.hh> |
8 | | #include <qpdf/QTC.hh> |
9 | | |
10 | | bool |
11 | | SF_FlateLzwDecode::setDecodeParms(QPDFObjectHandle decode_parms) |
12 | 19.8k | { |
13 | 19.8k | if (decode_parms.isNull()) { |
14 | 13.3k | return true; |
15 | 13.3k | } |
16 | | |
17 | 6.45k | auto memory_limit = Pl_Flate::memory_limit(); |
18 | | |
19 | 6.45k | std::set<std::string> keys = decode_parms.getKeys(); |
20 | 14.1k | for (auto const& key: keys) { |
21 | 14.1k | QPDFObjectHandle value = decode_parms.getKey(key); |
22 | 14.1k | if (key == "/Predictor") { |
23 | 3.76k | if (value.isInteger()) { |
24 | 3.75k | predictor = value.getIntValueAsInt(); |
25 | 3.75k | if (!(predictor == 1 || predictor == 2 || (predictor >= 10 && predictor <= 15))) { |
26 | 100 | return false; |
27 | 100 | } |
28 | 3.75k | } else { |
29 | 15 | return false; |
30 | 15 | } |
31 | 10.3k | } else if (key == "/Columns" || key == "/Colors" || key == "/BitsPerComponent") { |
32 | 3.31k | if (value.isInteger()) { |
33 | 3.29k | int val = value.getIntValueAsInt(); |
34 | 3.29k | if (memory_limit && static_cast<unsigned int>(val) > memory_limit) { |
35 | 10 | QPDFLogger::defaultLogger()->warn( |
36 | 10 | "SF_FlateLzwDecode parameter exceeds PL_Flate memory limit\n"); |
37 | 10 | return false; |
38 | 10 | } |
39 | 3.28k | if (key == "/Columns") { |
40 | 1.60k | columns = val; |
41 | 1.67k | } else if (key == "/Colors") { |
42 | 1.04k | colors = val; |
43 | 1.04k | } else if (key == "/BitsPerComponent") { |
44 | 633 | bits_per_component = val; |
45 | 633 | } |
46 | 3.28k | } else { |
47 | 14 | return false; |
48 | 14 | } |
49 | 7.04k | } else if (lzw && (key == "/EarlyChange")) { |
50 | 637 | if (value.isInteger()) { |
51 | 634 | int earlychange = value.getIntValueAsInt(); |
52 | 634 | early_code_change = (earlychange == 1); |
53 | 634 | if (!(earlychange == 0 || earlychange == 1)) { |
54 | 46 | return false; |
55 | 46 | } |
56 | 634 | } else { |
57 | 3 | return false; |
58 | 3 | } |
59 | 637 | } |
60 | 14.1k | } |
61 | | |
62 | 6.26k | if (predictor > 1 && columns == 0) { |
63 | 3 | return false; |
64 | 3 | } |
65 | | |
66 | 6.26k | return true; |
67 | 6.26k | } |
68 | | |
69 | | Pipeline* |
70 | | SF_FlateLzwDecode::getDecodePipeline(Pipeline* next) |
71 | 19.5k | { |
72 | 19.5k | std::unique_ptr<Pipeline> pipeline; |
73 | 19.5k | if (predictor >= 10 && predictor <= 15) { |
74 | 2.21k | QTC::TC("qpdf", "SF_FlateLzwDecode PNG filter"); |
75 | 2.21k | pipeline = std::make_unique<Pl_PNGFilter>( |
76 | 2.21k | "png decode", |
77 | 2.21k | next, |
78 | 2.21k | Pl_PNGFilter::a_decode, |
79 | 2.21k | QIntC::to_uint(columns), |
80 | 2.21k | QIntC::to_uint(colors), |
81 | 2.21k | QIntC::to_uint(bits_per_component)); |
82 | 2.21k | next = pipeline.get(); |
83 | 2.21k | pipelines.push_back(std::move(pipeline)); |
84 | 17.3k | } else if (predictor == 2) { |
85 | 1.18k | QTC::TC("qpdf", "SF_FlateLzwDecode TIFF predictor"); |
86 | 1.18k | pipeline = std::make_unique<Pl_TIFFPredictor>( |
87 | 1.18k | "tiff decode", |
88 | 1.18k | next, |
89 | 1.18k | Pl_TIFFPredictor::a_decode, |
90 | 1.18k | QIntC::to_uint(columns), |
91 | 1.18k | QIntC::to_uint(colors), |
92 | 1.18k | QIntC::to_uint(bits_per_component)); |
93 | 1.18k | next = pipeline.get(); |
94 | 1.18k | pipelines.push_back(std::move(pipeline)); |
95 | 1.18k | } |
96 | | |
97 | 19.5k | if (lzw) { |
98 | 5.30k | pipeline = std::make_unique<Pl_LZWDecoder>("lzw decode", next, early_code_change); |
99 | 14.2k | } else { |
100 | 14.2k | pipeline = std::make_unique<Pl_Flate>("stream inflate", next, Pl_Flate::a_inflate); |
101 | 14.2k | } |
102 | 19.5k | next = pipeline.get(); |
103 | 19.5k | pipelines.push_back(std::move(pipeline)); |
104 | 19.5k | return next; |
105 | 19.5k | } |