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Code Issues Releases Wiki Activity

Better recovery of bad stream start (fixes #104)

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This commit is contained in:
Jay Berkenbilt 2017-07-29 11:59:15 -04:00
parent 39d7307f3f
commit 07d6f770b2
6 changed files with 65 additions and 31 deletions
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3
ChangeLog
View File

@ -1,5 +1,8 @@
2017-07-29 Jay Berkenbilt <ejb@ql.org>
* Improve handling of files where the "stream" keyword is not
followed by proper line terminators. Fixes #104.
* Fix content stream parsing to handle cases of structures within
the stream split across stream boundaries. Fixes #73.

5
libqpdf/QPDF.cc
View File

@ -1117,6 +1117,11 @@ QPDF::readObject(PointerHolder<InputSource> input,
else
{
QTC::TC("qpdf", "QPDF stream without newline");
if (! QUtil::is_space(ch))
{
QTC::TC("qpdf", "QPDF stream with non-space");
input->unreadCh(ch);
}
warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
this->last_object_description,
input->tell(),

1
qpdf/qpdf.testcov
View File

@ -283,3 +283,4 @@ QPDFWriter precheck stream 0
QPDFWriter preserve unreferenced standard 0
QPDFObjectHandle non-stream in parsecontent 0
QPDFObjectHandle errors in parsecontent 0
QPDF stream with non-space 0

5
qpdf/qtest/qpdf/stream-line-enders.out
View File

@ -1,3 +1,4 @@
WARNING: stream-line-enders.pdf (object 5 0, file position 378): stream keyword followed by carriage return only
WARNING: stream-line-enders.pdf (object 6 0, file position 437): stream keyword not followed by proper line terminator
WARNING: stream-line-enders.pdf (object 5 0, file position 384): stream keyword followed by carriage return only
WARNING: stream-line-enders.pdf (object 6 0, file position 443): stream keyword not followed by proper line terminator
WARNING: stream-line-enders.pdf (object 7 0, file position 503): stream keyword not followed by proper line terminator
qpdf: operation succeeded with warnings; resulting file may have some problems

30
qpdf/qtest/qpdf/stream-line-enders.pdf
View File

@ -7,7 +7,7 @@ endobj
<< /Count 1 /Kids [ 3 0 R ] /Type /Pages >>
endobj
3 0 obj
<< /Contents [ 4 0 R 5 0 R 6 0 R ] /MediaBox [ 0 0 612 792 ] /Parent 2 0 R /Resources << /Font << /F1 7 0 R >> /ProcSet 8 0 R >> /Type /Page >>
<< /Contents [ 4 0 R 5 0 R 6 0 R 7 0 R ] /MediaBox [ 0 0 612 792 ] /Parent 2 0 R /Resources << /Font << /F1 8 0 R >> /ProcSet 9 0 R >> /Type /Page >>
endobj
4 0 obj
<< /Length 14 >>
@ -22,29 +22,35 @@ stream 72 720 Td
endstream
endobj
6 0 obj
<< /Length 15 >>
<< /Length 12 >>
stream (Potato) Tj
ET
endstream
endobj
7 0 obj
<< /BaseFont /Helvetica /Encoding /WinAnsiEncoding /Name /F1 /Subtype /Type1 /Type /Font >>
<< /Length 11 >>
stream%comment
ET
endstream
endobj
8 0 obj
<< /BaseFont /Helvetica /Encoding /WinAnsiEncoding /Name /F1 /Subtype /Type1 /Type /Font >>
endobj
9 0 obj
[ /PDF /Text ]
endobj
xref
0 9
0 10
0000000000 65535 f
0000000015 00000 n
0000000064 00000 n
0000000123 00000 n
0000000282 00000 n
0000000346 00000 n
0000000405 00000 n
0000000469 00000 n
0000000576 00000 n
trailer << /Root 1 0 R /Size 9 /ID [<08aa98c73f8a7262d77c8328772c3989><7b1f32865e2165debe277f27ee790092>] >>
0000000288 00000 n
0000000352 00000 n
0000000411 00000 n
0000000472 00000 n
0000000532 00000 n
0000000639 00000 n
trailer << /Root 1 0 R /Size 10 /ID [<08aa98c73f8a7262d77c8328772c3989><5a35fde138b2e8251b9e079b560c0253>] >>
startxref
606
669
%%EOF

52
qpdf/qtest/qpdf/stream-line-enders.qdf
View File

@ -29,6 +29,7 @@ endobj
4 0 R
6 0 R
8 0 R
10 0 R
]
/MediaBox [
0
@ -39,9 +40,9 @@ endobj
/Parent 2 0 R
/Resources <<
/Font <<
/F1 10 0 R
/F1 12 0 R
>>
/ProcSet 11 0 R
/ProcSet 13 0 R
>>
/Type /Page
>>
@ -86,16 +87,31 @@ endobj
>>
stream
(Potato) Tj
ET
endstream
endobj
9 0 obj
15
12
endobj
%% Contents for page 1
%% Original object ID: 7 0
10 0 obj
<<
/Length 11 0 R
>>
stream
%comment
ET
endstream
endobj
11 0 obj
12
endobj
%% Original object ID: 8 0
12 0 obj
<<
/BaseFont /Helvetica
/Encoding /WinAnsiEncoding
@ -105,8 +121,8 @@ endobj
>>
endobj
%% Original object ID: 8 0
11 0 obj
%% Original object ID: 9 0
13 0 obj
[
/PDF
/Text
@ -114,24 +130,26 @@ endobj
endobj
xref
0 12
0 14
0000000000 65535 f
0000000052 00000 n
0000000133 00000 n
0000000242 00000 n
0000000516 00000 n
0000000585 00000 n
0000000654 00000 n
0000000719 00000 n
0000000788 00000 n
0000000858 00000 n
0000000904 00000 n
0000001050 00000 n
0000000527 00000 n
0000000596 00000 n
0000000665 00000 n
0000000730 00000 n
0000000799 00000 n
0000000866 00000 n
0000000935 00000 n
0000001004 00000 n
0000001051 00000 n
0000001197 00000 n
trailer <<
/Root 1 0 R
/Size 12
/Size 14
/ID [<08aa98c73f8a7262d77c8328772c3989><31415926535897932384626433832795>]
>>
startxref
1086
1233
%%EOF