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treat empty objects as null

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git-svn-id: svn+q:///qpdf/trunk@1027 71b93d88-0707-0410-a8cf-f5a4172ac649
This commit is contained in:
Jay Berkenbilt 2010-09-06 02:17:55 +00:00
parent 1dade9a7ee
commit 047bcfcaa6
5 changed files with 111 additions and 1 deletions
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3
ChangeLog
View File

@ -1,5 +1,8 @@
2010-09-05 Jay Berkenbilt <ejb@ql.org>
* libqpdf/QPDF.cc (readObjectInternal): Recognize empty objects
and treat them as null.
* libqpdf/QPDF_Stream.cc (filterable): Handle inline image filter
abbreviations as stream filter abbreviations. Although this is
not technically allowed by the PDF specification, table H.1 in the

14
libqpdf/QPDF.cc
View File

@ -1197,6 +1197,20 @@ QPDF::readObjectInternal(InputSource* input,
olist.pop_back();
olist.pop_back();
}
else if ((value == "endobj") &&
(! (in_array || in_dictionary)))
{
// Nothing in the PDF spec appears to allow empty
// objects, but they have been encountered in
// actual PDF files and Adobe Reader appears to
// ignore them.
warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
this->last_object_description,
input->getLastOffset(),
"empty object treated as null"));
object = QPDFObjectHandle::newNull();
input->seek(input->getLastOffset(), SEEK_SET);
}
else
{
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),

8
qpdf/qtest/qpdf.test
View File

@ -111,7 +111,7 @@ $td->runtest("new stream",
show_ntests();
# ----------
$td->notify("--- Miscellaneous Tests ---");
$n_tests += 25;
$n_tests += 26;
$td->runtest("qpdf version",
{$td->COMMAND => "qpdf --version"},
@ -239,6 +239,12 @@ $td->runtest("check output",
{$td->FILE => "a.pdf"},
{$td->FILE => "filter-abbreviation.out"});
$td->runtest("empty object",
{$td->COMMAND => "qpdf -show-object=7,0 empty-object.pdf"},
{$td->FILE => "empty-object.out",
$td->EXIT_STATUS => 3},
$td->NORMALIZE_NEWLINES);
show_ntests();
# ----------
$td->notify("--- Error Condition Tests ---");

3
qpdf/qtest/qpdf/empty-object.out Normal file
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@ -0,0 +1,3 @@
WARNING: empty-object.pdf (object 7 0, file position 575): empty object treated as null
null
qpdf: operation succeeded with warnings; resulting file may have some problems

84
qpdf/qtest/qpdf/empty-object.pdf Normal file
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@ -0,0 +1,84 @@
%PDF-1.3
1 0 obj
<<
/Type /Catalog
/Pages 2 0 R
/X 7 0 R
>>
endobj
2 0 obj
<<
/Type /Pages
/Kids [
3 0 R
]
/Count 1
>>
endobj
3 0 obj
<<
/Type /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
7 0 obj
endobj
xref
0 8
0000000000 65535 f
0000000009 00000 n
0000000074 00000 n
0000000146 00000 n
0000000318 00000 n
0000000414 00000 n
0000000449 00000 n
0000000567 00000 n
trailer <<
/Size 8
/Root 1 0 R
>>
startxref
583
%%EOF