OpenSystemsDevelopment / qpdf

Commit d8900c2255d12adbe9342ea751403740ca7a826d

Authored by Jay Berkenbilt
1 parent caab1b0e

Handle page tree node with no /Type 

Original reported here:
https://bugs.launchpad.net/ubuntu/+source/qpdf/+bug/1397413

The PDF specification says that the /Type key for nodes in the pages
dictionary (both /Page and /Pages) is required, but some PDF files
omit them. Use the presence of other keys to determine the type of
pages tree node this is if the type key is not found.
Inline Side-by-side
Showing 5 changed files with 112 additions and 2 deletions
ChangeLog
  View file @d8900c2
  1 +2014-12-01 Jay Berkenbilt <ejb@ql.org>
  2 +
  3 + * Some broken PDF files lack the required /Type key for /Page and
  4 + /Pages nodes in the page dictionary. QPDF now uses other methods
  5 + to figure out what kind of node it is looking at so that it can
  6 + handle those files. Original reported at
  7 + https://bugs.launchpad.net/ubuntu/+source/qpdf/+bug/1397413
  8 +
1 9 2014-11-14 Jay Berkenbilt <ejb@ql.org>
2 10  
3 11 * Bug fix: QPDFObjectHandle::getPageContents() no longer throws an
... ...
libqpdf/QPDF_pages.cc
  View file @d8900c2
... ... @@ -56,7 +56,20 @@ void
56 56 QPDF::getAllPagesInternal(QPDFObjectHandle cur_pages,
57 57 std::vector<QPDFObjectHandle>& result)
58 58 {
59   - std::string type = cur_pages.getKey("/Type").getName();
  59 + std::string type;
  60 + QPDFObjectHandle type_key = cur_pages.getKey("/Type");
  61 + if (type_key.isName())
  62 + {
  63 + type = type_key.getName();
  64 + }
  65 + else if (cur_pages.hasKey("/Kids"))
  66 + {
  67 + type = "/Pages";
  68 + }
  69 + else
  70 + {
  71 + type = "/Page";
  72 + }
60 73 if (type == "/Pages")
61 74 {
62 75 QPDFObjectHandle kids = cur_pages.getKey("/Kids");
... ...
qpdf/qtest/qpdf.test
  View file @d8900c2
... ... @@ -199,7 +199,7 @@ $td-&gt;runtest(&quot;remove page we don&#39;t have&quot;,
199 199 show_ntests();
200 200 # ----------
201 201 $td->notify("--- Miscellaneous Tests ---");
202   -$n_tests += 73;
  202 +$n_tests += 74;
203 203  
204 204 $td->runtest("qpdf version",
205 205 {$td->COMMAND => "qpdf --version"},
... ... @@ -558,6 +558,10 @@ $td-&gt;runtest(&quot;handle page no with contents&quot;,
558 558 {$td->COMMAND => "qpdf --show-pages page-no-content.pdf"},
559 559 {$td->FILE => "page-no-content.out", $td->EXIT_STATUS => 0},
560 560 $td->NORMALIZE_NEWLINES);
  561 +$td->runtest("no type key for page nodes",
  562 + {$td->COMMAND => "qpdf --check no-pages-types.pdf"},
  563 + {$td->FILE => "no-pages-types.out", $td->EXIT_STATUS => 0},
  564 + $td->NORMALIZE_NEWLINES);
561 565  
562 566 show_ntests();
563 567 # ----------
... ...
qpdf/qtest/qpdf/no-pages-types.out 0 → 100644
  View file @d8900c2
  1 +checking no-pages-types.pdf
  2 +PDF Version: 1.3
  3 +File is not encrypted
  4 +File is not linearized
  5 +No syntax or stream encoding errors found; the file may still contain
  6 +errors that qpdf cannot detect
... ...
qpdf/qtest/qpdf/no-pages-types.pdf 0 → 100644
  View file @d8900c2
  1 +%PDF-1.3
  2 +1 0 obj
  3 +<<
  4 + /Type /Catalog
  5 + /Pages 2 0 R
  6 +>>
  7 +endobj
  8 +
  9 +2 0 obj
  10 +<<
  11 + /Zype /Pages
  12 + /Kids [
  13 + 3 0 R
  14 + ]
  15 + /Count 1
  16 +>>
  17 +endobj
  18 +
  19 +3 0 obj
  20 +<<
  21 + /Zype /Page
  22 + /Parent 2 0 R
  23 + /MediaBox [0 0 612 792]
  24 + /Contents 4 0 R
  25 + /Resources <<
  26 + /ProcSet 5 0 R
  27 + /Font <<
  28 + /F1 6 0 R
  29 + >>
  30 + >>
  31 +>>
  32 +endobj
  33 +
  34 +4 0 obj
  35 +<<
  36 + /Length 44
  37 +>>
  38 +stream
  39 +BT
  40 + /F1 24 Tf
  41 + 72 720 Td
  42 + (Potato) Tj
  43 +ET
  44 +endstream
  45 +endobj
  46 +
  47 +5 0 obj
  48 +[
  49 + /PDF
  50 + /Text
  51 +]
  52 +endobj
  53 +
  54 +6 0 obj
  55 +<<
  56 + /Type /Font
  57 + /Subtype /Type1
  58 + /Name /F1
  59 + /BaseFont /Helvetica
  60 + /Encoding /WinAnsiEncoding
  61 +>>
  62 +endobj
  63 +
  64 +xref
  65 +0 7
  66 +0000000000 65535 f
  67 +0000000009 00000 n
  68 +0000000063 00000 n
  69 +0000000135 00000 n
  70 +0000000307 00000 n
  71 +0000000403 00000 n
  72 +0000000438 00000 n
  73 +trailer <<
  74 + /Size 7
  75 + /Root 1 0 R
  76 +>>
  77 +startxref
  78 +556
  79 +%%EOF
... ...