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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.
This commit is contained in:
Jay Berkenbilt 2014-12-01 14:44:47 -05:00
parent caab1b0e16
commit d8900c2255
5 changed files with 112 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
ChangeLog
View File

@ -1,3 +1,11 @@
2014-12-01 Jay Berkenbilt <ejb@ql.org>
* Some broken PDF files lack the required /Type key for /Page and
/Pages nodes in the page dictionary. QPDF now uses other methods
to figure out what kind of node it is looking at so that it can
handle those files. Original reported at
https://bugs.launchpad.net/ubuntu/+source/qpdf/+bug/1397413
2014-11-14 Jay Berkenbilt <ejb@ql.org>
* Bug fix: QPDFObjectHandle::getPageContents() no longer throws an

15
libqpdf/QPDF_pages.cc
View File

@ -56,7 +56,20 @@ void
QPDF::getAllPagesInternal(QPDFObjectHandle cur_pages,
std::vector<QPDFObjectHandle>& result)
{
std::string type = cur_pages.getKey("/Type").getName();
std::string type;
QPDFObjectHandle type_key = cur_pages.getKey("/Type");
if (type_key.isName())
{
type = type_key.getName();
}
else if (cur_pages.hasKey("/Kids"))
{
type = "/Pages";
}
else
{
type = "/Page";
}
if (type == "/Pages")
{
QPDFObjectHandle kids = cur_pages.getKey("/Kids");

6
qpdf/qtest/qpdf.test
View File

@ -199,7 +199,7 @@ $td->runtest("remove page we don't have",
show_ntests();
# ----------
$td->notify("--- Miscellaneous Tests ---");
$n_tests += 73;
$n_tests += 74;
$td->runtest("qpdf version",
{$td->COMMAND => "qpdf --version"},
@ -558,6 +558,10 @@ $td->runtest("handle page no with contents",
{$td->COMMAND => "qpdf --show-pages page-no-content.pdf"},
{$td->FILE => "page-no-content.out", $td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("no type key for page nodes",
{$td->COMMAND => "qpdf --check no-pages-types.pdf"},
{$td->FILE => "no-pages-types.out", $td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
show_ntests();
# ----------

6
qpdf/qtest/qpdf/no-pages-types.out Normal file
View File

@ -0,0 +1,6 @@
checking no-pages-types.pdf
PDF Version: 1.3
File is not encrypted
File is not linearized
No syntax or stream encoding errors found; the file may still contain
errors that qpdf cannot detect

79
qpdf/qtest/qpdf/no-pages-types.pdf Normal file
View File

@ -0,0 +1,79 @@
%PDF-1.3
1 0 obj
<<
/Type /Catalog
/Pages 2 0 R
>>
endobj
2 0 obj
<<
/Zype /Pages
/Kids [
3 0 R
]
/Count 1
>>
endobj
3 0 obj
<<
/Zype /Page
/Parent 2 0 R
/MediaBox [0 0 612 792]
/Contents 4 0 R
/Resources <<
/ProcSet 5 0 R
/Font <<
/F1 6 0 R
>>
>>
>>
endobj
4 0 obj
<<
/Length 44
>>
stream
BT
/F1 24 Tf
72 720 Td
(Potato) Tj
ET
endstream
endobj
5 0 obj
[
/PDF
/Text
]
endobj
6 0 obj
<<
/Type /Font
/Subtype /Type1
/Name /F1
/BaseFont /Helvetica
/Encoding /WinAnsiEncoding
>>
endobj
xref
0 7
0000000000 65535 f
0000000009 00000 n
0000000063 00000 n
0000000135 00000 n
0000000307 00000 n
0000000403 00000 n
0000000438 00000 n
trailer <<
/Size 7
/Root 1 0 R
>>
startxref
556
%%EOF