OpenSystemsDevelopment / qpdf

Commit a496dbe8b282e323b091aafe2c596068d642b8fb

Authored by m-holger
1 parent a8631e25

In SF_FlateLzwDecode::setDecodeParms return early on failure 

The stream filter is only used if the stream is filterable, therefore
there is no point continuing to set decode parameters once it is recognized
that the stream is not filterable.
Inline Side-by-side
Showing 1 changed file with 7 additions and 8 deletions
libqpdf/SF_FlateLzwDecode.cc
  View file @a496dbe
... ... @@ -14,7 +14,6 @@ SF_FlateLzwDecode::setDecodeParms(QPDFObjectHandle decode_parms)
14 14 return true;
15 15 }
16 16  
17   - bool filterable = true;
18 17 std::set<std::string> keys = decode_parms.getKeys();
19 18 for (auto const& key: keys) {
20 19 QPDFObjectHandle value = decode_parms.getKey(key);
... ... @@ -22,10 +21,10 @@ SF_FlateLzwDecode::setDecodeParms(QPDFObjectHandle decode_parms)
22 21 if (value.isInteger()) {
23 22 predictor = value.getIntValueAsInt();
24 23 if (!(predictor == 1 || predictor == 2 || (predictor >= 10 && predictor <= 15))) {
25   - filterable = false;
  24 + return false;
26 25 }
27 26 } else {
28   - filterable = false;
  27 + return false;
29 28 }
30 29 } else if (key == "/Columns" || key == "/Colors" || key == "/BitsPerComponent") {
31 30 if (value.isInteger()) {
... ... @@ -38,26 +37,26 @@ SF_FlateLzwDecode::setDecodeParms(QPDFObjectHandle decode_parms)
38 37 bits_per_component = val;
39 38 }
40 39 } else {
41   - filterable = false;
  40 + return false;
42 41 }
43 42 } else if (lzw && (key == "/EarlyChange")) {
44 43 if (value.isInteger()) {
45 44 int earlychange = value.getIntValueAsInt();
46 45 early_code_change = (earlychange == 1);
47 46 if (!(earlychange == 0 || earlychange == 1)) {
48   - filterable = false;
  47 + return false;
49 48 }
50 49 } else {
51   - filterable = false;
  50 + return false;
52 51 }
53 52 }
54 53 }
55 54  
56 55 if (predictor > 1 && columns == 0) {
57   - filterable = false;
  56 + return false;
58 57 }
59 58  
60   - return filterable;
  59 + return true;
61 60 }
62 61  
63 62 Pipeline*
... ...