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Convert object parsing errors to warnings 

QPDFObjectHandle::parseInternal now issues warnings instead of
throwing exceptions for all error conditions that it finds (except
internal logic errors) and has stronger recovery for things like
invalid tokens and malformed dictionaries. This should improve qpdf's
ability to recover from a wide range of broken files that currently
cause it to fail.
This commit is contained in:
Jay Berkenbilt 2017-07-26 14:38:49 -04:00
parent dd8dad74f4
commit 40f00122b8
26 changed files with 376 additions and 125 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -1,3 +1,10 @@
2017-07-27 Jay Berkenbilt <ejb@ql.org>
* Significantly improve recoverability from invalid qpdf objects.
Most conditions in basic object parsing that used to cause qpdf to
exit are now warnings. There are still many more opportunities for
improvements of this sort beyond just object parsing.
2017-07-26 Jay Berkenbilt <ejb@ql.org>
* Fixes to infinite loops below also fix problems reported in

12
include/qpdf/QPDF.hh
View File

@ -522,6 +522,18 @@ class QPDF
};
friend class Resolver;
// Warner class allows QPDFObjectHandle to create warnings
class Warner
{
friend class QPDFObjectHandle;
private:
static void warn(QPDF* qpdf, QPDFExc const& e)
{
qpdf->warn(e);
}
};
friend class Warner;
// Pipe class is restricted to QPDF_Stream
class Pipe
{

4
include/qpdf/QPDFObjectHandle.hh
View File

@ -28,6 +28,7 @@ class QPDF;
class QPDF_Dictionary;
class QPDF_Array;
class QPDFTokenizer;
class QPDFExc;
class QPDFObjectHandle
{
@ -623,6 +624,9 @@ class QPDFObjectHandle
static void parseContentStream_internal(
QPDFObjectHandle stream, ParserCallbacks* callbacks);
// Other methods
static void warn(QPDF*, QPDFExc const&);
bool initialized;
QPDF* qpdf; // 0 for direct object

5
libqpdf/QPDF.cc
View File

@ -334,8 +334,9 @@ QPDF::reconstruct_xref(QPDFExc& e)
{
if (this->reconstructed_xref)
{
// Avoid xref reconstruction infinite loops
QTC::TC("qpdf", "QPDF caught recursive xref reconstruction");
// Avoid xref reconstruction infinite loops. This is getting
// very hard to reproduce because qpdf is throwing many fewer
// exceptions while parsing. Most situations are warnings now.
throw e;
}

170
libqpdf/QPDFObjectHandle.cc
View File

@ -850,6 +850,11 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
bool in_array, bool in_dictionary,
bool content_stream)
{
// This method must take care not to resolve any objects. Don't
// check the tpye of any object without first ensuring that it is
// a direct object. Otherwise, doing so may have the side effect
// of reading the object and changing the file pointer.
empty = false;
if (in_dictionary && in_array)
{
@ -891,12 +896,13 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
case QPDFTokenizer::tt_brace_open:
case QPDFTokenizer::tt_brace_close:
// Don't know what to do with these for now
QTC::TC("qpdf", "QPDFObjectHandle bad brace");
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unexpected brace token");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unexpected brace token as null"));
object = newNull();
break;
case QPDFTokenizer::tt_array_close:
@ -907,10 +913,12 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
else
{
QTC::TC("qpdf", "QPDFObjectHandle bad array close");
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unexpected array close token");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unexpected array close token as null"));
object = newNull();
}
break;
@ -922,10 +930,12 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
else
{
QTC::TC("qpdf", "QPDFObjectHandle bad dictionary close");
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unexpected dictionary close token");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unexpected dictionary close token"));
object = newNull();
}
break;
@ -1002,11 +1012,14 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
}
else
{
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unknown token while reading object (" +
value + ")");
QTC::TC("qpdf", "QPDFObjectHandle treat word as string");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unknown token while reading object;"
" treating as string"));
object = newString(value);
}
}
break;
@ -1024,10 +1037,13 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
break;
default:
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unknown token type while reading object");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unknown token type as null while "
"reading object"));
object = newNull();
break;
}
@ -1040,10 +1056,12 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
}
else if (! object.isInitialized())
{
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"parse error while reading object");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"parse error while reading object"));
object = newNull();
}
else
{
@ -1057,30 +1075,65 @@ QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
}
else if (in_dictionary)
{
// Convert list to map. Alternating elements are keys.
std::map<std::string, QPDFObjectHandle> dict;
if (olist.size() % 2)
{
QTC::TC("qpdf", "QPDFObjectHandle dictionary odd number of elements");
throw QPDFExc(
qpdf_e_damaged_pdf, input->getName(),
object_description, input->getLastOffset(),
"dictionary ending here has an odd number of elements");
}
for (unsigned int i = 0; i < olist.size(); i += 2)
{
QPDFObjectHandle key_obj = olist.at(i);
QPDFObjectHandle val = olist.at(i + 1);
if (! key_obj.isName())
{
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(), object_description, offset,
std::string("dictionary key is not not a name token"));
}
dict[key_obj.getName()] = val;
}
object = newDictionary(dict);
// Convert list to map. Alternating elements are keys. Attempt
// to recover more or less gracefully from invalid
// dictionaries.
std::set<std::string> names;
for (std::vector<QPDFObjectHandle>::iterator iter = olist.begin();
iter != olist.end(); ++iter)
{
if ((! (*iter).isIndirect()) && (*iter).isName())
{
names.insert((*iter).getName());
}
}
std::map<std::string, QPDFObjectHandle> dict;
int next_fake_key = 1;
for (unsigned int i = 0; i < olist.size(); ++i)
{
QPDFObjectHandle key_obj = olist.at(i);
QPDFObjectHandle val;
if (key_obj.isIndirect() || (! key_obj.isName()))
{
bool found_fake = false;
std::string candidate;
while (! found_fake)
{
candidate =
"/QPDFFake" + QUtil::int_to_string(next_fake_key++);
found_fake = (names.count(candidate) == 0);
QTC::TC("qpdf", "QPDFObjectHandle found fake",
(found_fake ? 0 : 1));
}
warn(context,
QPDFExc(
qpdf_e_damaged_pdf,
input->getName(), object_description, offset,
"expected dictionary key but found"
" non-name object; inserting key " +
candidate));
val = key_obj;
key_obj = newName(candidate);
}
else if (i + 1 >= olist.size())
{
QTC::TC("qpdf", "QPDFObjectHandle no val for last key");
warn(context,
QPDFExc(
qpdf_e_damaged_pdf,
input->getName(), object_description, offset,
"dictionary ended prematurely; using null as value"
" for last key"));
val = newNull();
}
else
{
val = olist.at(++i);
}
dict[key_obj.getName()] = val;
}
object = newDictionary(dict);
}
return object;
@ -1544,3 +1597,20 @@ QPDFObjectHandle::dereference()
}
}
}
void
QPDFObjectHandle::warn(QPDF* qpdf, QPDFExc const& e)
{
// If parsing on behalf of a QPDF object and want to give a
// warning, we can warn through the object. If parsing for some
// other reason, such as an explicit creation of an object from a
// string, then just throw the exception.
if (qpdf)
{
QPDF::Warner::warn(qpdf, e);
}
else
{
throw e;
}
}

10
libqpdf/qpdf-c.cc
View File

@ -261,7 +261,15 @@ QPDF_ERROR_CODE qpdf_read(qpdf_data qpdf, char const* filename,
qpdf->filename = filename;
qpdf->password = password;
status = trap_errors(qpdf, &call_read);
QTC::TC("qpdf", "qpdf-c called qpdf_read", status);
// We no longer have a good way to exercise a file with both
// warnings and errors because qpdf is getting much better at
// recovering.
QTC::TC("qpdf", "qpdf-c called qpdf_read",
(status == 0) ? 0
: (status & QPDF_WARNINGS) ? 1
: (status & QPDF_ERRORS) ? 2 :
-1
);
return status;
}

7
qpdf/qpdf.testcov
View File

@ -61,7 +61,6 @@ QPDF trailer size not integer 0
QPDF trailer prev not integer 0
QPDFObjectHandle bad brace 0
QPDFObjectHandle bad array close 0
QPDFObjectHandle dictionary odd number of elements 0
QPDF stream without length 0
QPDF stream length not integer 0
QPDF missing endstream 0
@ -124,7 +123,7 @@ qpdf-c qpdf_next_warning returned warning 0
qpdf-c called qpdf_set_suppress_warnings 0
qpdf-c called qpdf_set_ignore_xref_streams 0
qpdf-c called qpdf_set_attempt_recovery 0
qpdf-c called qpdf_read 3
qpdf-c called qpdf_read 2
qpdf-c called qpdf_get_pdf_version 0
qpdf-c called qpdf_get_user_password 0
qpdf-c called qpdf_is_linearized 0
@ -275,5 +274,7 @@ QPDFWriter deterministic with no data 0
qpdf-c called qpdf_set_deterministic_ID 0
QPDFObjectHandle indirect with 0 objid 0
QPDF object id 0 0
QPDF caught recursive xref reconstruction 0
QPDF recursion loop in resolve 0
QPDFObjectHandle treat word as string 0
QPDFObjectHandle found fake 1
QPDFObjectHandle no val for last key 0

38
qpdf/qtest/qpdf.test
View File

@ -220,22 +220,22 @@ $td->runtest("C API: qpdf version",
# Files to reproduce various bugs
foreach my $d (
["51", "resolve loop"],
["99", "object 0"],
["99b", "object 0"],
["100","xref reconstruction loop"],
["101", "resolve for exception text"],
["117", "other infinite loop"],
["118", "other infinite loop"],
["119", "other infinite loop"],
["120", "other infinite loop"],
["51", "resolve loop", 2],
["99", "object 0", 2],
["99b", "object 0", 2],
["100", "xref reconstruction loop", 2],
["101", "resolve for exception text", 2],
["117", "other infinite loop", 2],
["118", "other infinite loop", 2],
["119", "other infinite loop", 3],
["120", "other infinite loop", 2],
)
{
my ($n, $description) = @$d;
my ($n, $description, $exit_status) = @$d;
$td->runtest($description,
{$td->COMMAND => "qpdf issue-$n.pdf a.pdf"},
{$td->FILE => "issue-$n.out",
$td->EXIT_STATUS => 2},
$td->EXIT_STATUS => $exit_status},
$td->NORMALIZE_NEWLINES);
}
@ -593,7 +593,7 @@ $td->runtest("no type key for page nodes",
$td->NORMALIZE_NEWLINES);
$td->runtest("ensure arguments to R are direct",
{$td->COMMAND => "qpdf --check indirect-r-arg.pdf"},
{$td->FILE => "indirect-r-arg.out", $td->EXIT_STATUS => 2},
{$td->FILE => "indirect-r-arg.out", $td->EXIT_STATUS => 3},
$td->NORMALIZE_NEWLINES);
$td->runtest("detect loops in pages structure",
{$td->COMMAND => "qpdf --check pages-loop.pdf"},
@ -784,16 +784,19 @@ my @badfiles = ("not a PDF file", # 1
"invalid stream /Filter and xref", # 33
"obj/gen in wrong place", # 34
"object stream of wrong type", # 35
"bad dictionary key", # 36
);
$n_tests += @badfiles + 5;
$n_tests += @badfiles + 4;
# Test 6 contains errors in the free table consistency, but we no
# longer have any consistency check for this since it is not important
# neither Acrobat nor other PDF viewers really care. Tests 12 and 28
# have error conditions that used to be fatal but are now considered
# non-fatal.
my %badtest_overrides = (6 => 0, 12 => 0, 28 => 0, 31 => 0);
my %badtest_overrides = (6 => 0, 12 => 0, 13 => 0,
14 => 0, 15 => 0, 17 => 0,
28 => 0, 31 => 0, 36 => 0);
for (my $i = 1; $i <= scalar(@badfiles); ++$i)
{
my $status = $badtest_overrides{$i};
@ -810,11 +813,6 @@ $td->runtest("C API: errors",
{$td->FILE => "c-read-errors.out",
$td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("C API: warnings and errors",
{$td->COMMAND => "qpdf-ctest 2 bad17.pdf '' a.pdf"},
{$td->FILE => "c-read-warnings-and-errors.out",
$td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("C API: errors writing",
{$td->COMMAND => "qpdf-ctest 2 bad30.pdf '' a.pdf"},
{$td->FILE => "c-write-errors.out",
@ -842,7 +840,7 @@ $n_tests += @badfiles + 8;
# though in some cases it may. Acrobat Reader would not be able to
# recover any of these files any better.
my %recover_failures = ();
for (1, 7, 13..21, 24, 29..30, 33, 35)
for (1, 7, 16, 18..21, 24, 29..30, 33, 35)
{
$recover_failures{$_} = 1;
}

11
qpdf/qtest/qpdf/bad13-recover.out
View File

@ -1,4 +1,7 @@
WARNING: bad13.pdf: file is damaged
WARNING: bad13.pdf (trailer, file position 753): unexpected brace token
WARNING: bad13.pdf: Attempting to reconstruct cross-reference table
bad13.pdf (trailer, file position 753): unexpected brace token
WARNING: bad13.pdf (trailer, file position 753): treating unexpected brace token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 1 done

8
qpdf/qtest/qpdf/bad13.out
View File

@ -1 +1,7 @@
bad13.pdf (trailer, file position 753): unexpected brace token
WARNING: bad13.pdf (trailer, file position 753): treating unexpected brace token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 0 done

11
qpdf/qtest/qpdf/bad14-recover.out
View File

@ -1,4 +1,7 @@
WARNING: bad14.pdf: file is damaged
WARNING: bad14.pdf (trailer, file position 753): unexpected brace token
WARNING: bad14.pdf: Attempting to reconstruct cross-reference table
bad14.pdf (trailer, file position 753): unexpected brace token
WARNING: bad14.pdf (trailer, file position 753): treating unexpected brace token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 1 done

8
qpdf/qtest/qpdf/bad14.out
View File

@ -1 +1,7 @@
bad14.pdf (trailer, file position 753): unexpected brace token
WARNING: bad14.pdf (trailer, file position 753): treating unexpected brace token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 0 done

11
qpdf/qtest/qpdf/bad15-recover.out
View File

@ -1,4 +1,7 @@
WARNING: bad15.pdf: file is damaged
WARNING: bad15.pdf (trailer, file position 753): unexpected array close token
WARNING: bad15.pdf: Attempting to reconstruct cross-reference table
bad15.pdf (trailer, file position 753): unexpected array close token
WARNING: bad15.pdf (trailer, file position 753): treating unexpected array close token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 1 done

8
qpdf/qtest/qpdf/bad15.out
View File

@ -1 +1,7 @@
bad15.pdf (trailer, file position 753): unexpected array close token
WARNING: bad15.pdf (trailer, file position 753): treating unexpected array close token as null
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 0 done

10
qpdf/qtest/qpdf/bad16-recover.out
View File

@ -1,4 +1,10 @@
WARNING: bad16.pdf: file is damaged
WARNING: bad16.pdf (trailer, file position 753): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 756): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 759): unknown token while reading object; treating as string
WARNING: bad16.pdf: file is damaged
WARNING: bad16.pdf (trailer, file position 773): EOF while reading token
WARNING: bad16.pdf: Attempting to reconstruct cross-reference table
bad16.pdf (trailer, file position 753): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 753): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 756): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 759): unknown token while reading object; treating as string
bad16.pdf (trailer, file position 773): EOF while reading token

5
qpdf/qtest/qpdf/bad16.out
View File

@ -1 +1,4 @@
bad16.pdf (trailer, file position 753): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 753): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 756): unexpected dictionary close token
WARNING: bad16.pdf (trailer, file position 759): unknown token while reading object; treating as string
bad16.pdf (trailer, file position 773): EOF while reading token

11
qpdf/qtest/qpdf/bad17-recover.out
View File

@ -1,4 +1,7 @@
WARNING: bad17.pdf: file is damaged
WARNING: bad17.pdf (trailer, file position 753): dictionary ending here has an odd number of elements
WARNING: bad17.pdf: Attempting to reconstruct cross-reference table
bad17.pdf (trailer, file position 753): dictionary ending here has an odd number of elements
WARNING: bad17.pdf (trailer, file position 715): dictionary ended prematurely; using null as value for last key
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 1 done

8
qpdf/qtest/qpdf/bad17.out
View File

@ -1 +1,7 @@
bad17.pdf (trailer, file position 753): dictionary ending here has an odd number of elements
WARNING: bad17.pdf (trailer, file position 715): dictionary ended prematurely; using null as value for last key
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 0 done

9
qpdf/qtest/qpdf/bad36-recover.out Normal file
View File

@ -0,0 +1,9 @@
WARNING: bad36.pdf (trailer, file position 764): unknown token while reading object; treating as string
WARNING: bad36.pdf (trailer, file position 715): expected dictionary key but found non-name object; inserting key /QPDFFake2
WARNING: bad36.pdf (trailer, file position 715): dictionary ended prematurely; using null as value for last key
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 1 done

9
qpdf/qtest/qpdf/bad36.out Normal file
View File

@ -0,0 +1,9 @@
WARNING: bad36.pdf (trailer, file position 764): unknown token while reading object; treating as string
WARNING: bad36.pdf (trailer, file position 715): expected dictionary key but found non-name object; inserting key /QPDFFake2
WARNING: bad36.pdf (trailer, file position 715): dictionary ended prematurely; using null as value for last key
/QTest is implicit
/QTest is direct and has type null (2)
/QTest is null
unparse: null
unparseResolved: null
test 0 done

81
qpdf/qtest/qpdf/bad36.pdf Normal file
View File

@ -0,0 +1,81 @@
%PDF-1.3
1 0 obj
<<
/Type /Catalog
/Pages 2 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
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
/QPDFFake1 (potato)
x /Something
>>
startxref
556
%%EOF

20
qpdf/qtest/qpdf/c-read-warnings-and-errors.out
View File

@ -1,20 +0,0 @@
warning: bad17.pdf: file is damaged
code: 5
file: bad17.pdf
pos : 0
text: file is damaged
warning: bad17.pdf (trailer, file position 753): dictionary ending here has an odd number of elements
code: 5
file: bad17.pdf
pos : 753
text: dictionary ending here has an odd number of elements
warning: bad17.pdf: Attempting to reconstruct cross-reference table
code: 5
file: bad17.pdf
pos : 0
text: Attempting to reconstruct cross-reference table
error: bad17.pdf (trailer, file position 753): dictionary ending here has an odd number of elements
code: 5
file: bad17.pdf
pos : 753
text: dictionary ending here has an odd number of elements

8
qpdf/qtest/qpdf/indirect-r-arg.out
View File

@ -1 +1,7 @@
indirect-r-arg.pdf (file position 76): unknown token while reading object (R)
WARNING: indirect-r-arg.pdf (file position 76): unknown token while reading object; treating as string
WARNING: indirect-r-arg.pdf (file position 62): expected dictionary key but found non-name object; inserting key /QPDFFake1
WARNING: indirect-r-arg.pdf (file position 62): expected dictionary key but found non-name object; inserting key /QPDFFake2
checking indirect-r-arg.pdf
PDF Version: 1.3
File is not encrypted
File is not linearized

10
qpdf/qtest/qpdf/issue-100.out
View File

@ -1,5 +1,13 @@
WARNING: issue-100.pdf: file is damaged
WARNING: issue-100.pdf (file position 736): xref not found
WARNING: issue-100.pdf: Attempting to reconstruct cross-reference table
WARNING: issue-100.pdf (file position 268): unknown token while reading object; treating as string
WARNING: issue-100.pdf (file position 286): unknown token while reading object; treating as string
WARNING: issue-100.pdf (file position 289): unknown token while reading object; treating as string
WARNING: issue-100.pdf (file position 294): unknown token while reading object; treating as string
WARNING: issue-100.pdf (file position 297): unknown token while reading object; treating as string
WARNING: issue-100.pdf (file position 304): unknown token while reading object; treating as string
WARNING: issue-100.pdf (object 5 0, file position 489): attempting to recover stream length
issue-100.pdf (object 6 0, file position 59): expected n n obj
WARNING: issue-100.pdf (trailer, file position 953): expected dictionary key but found non-name object; inserting key /QPDFFake1
WARNING: issue-100.pdf (trailer, file position 953): dictionary ended prematurely; using null as value for last key
operation for Dictionary object attempted on object of wrong type

15
qpdf/qtest/qpdf/issue-101.out
View File

@ -1,6 +1,17 @@
WARNING: issue-101.pdf: file is damaged
WARNING: issue-101.pdf (file position 3526): xref not found
WARNING: issue-101.pdf: Attempting to reconstruct cross-reference table
WARNING: issue-101.pdf (file position 1242): expected dictionary key but found non-name object; inserting key /QPDFFake1
WARNING: issue-101.pdf (file position 1242): dictionary ended prematurely; using null as value for last key
WARNING: issue-101.pdf (object 5 0, file position 1509): attempting to recover stream length
WARNING: issue-101.pdf (object 5 0, file position 2097): attempting to recover stream length
issue-101.pdf (trailer, file position 2928): unknown token while reading object (ÿ)
WARNING: issue-101.pdf (trailer, file position 2097): attempting to recover stream length
WARNING: issue-101.pdf (trailer, file position 2928): unknown token while reading object; treating as string
WARNING: issue-101.pdf (trailer, file position 2930): unknown token while reading object; treating as string
WARNING: issue-101.pdf (trailer, file position 2928): expected dictionary key but found non-name object; inserting key /QPDFFake1
WARNING: issue-101.pdf (trailer, file position 2928): expected dictionary key but found non-name object; inserting key /QPDFFake2
WARNING: issue-101.pdf (trailer, file position 2928): expected dictionary key but found non-name object; inserting key /QPDFFake3
WARNING: issue-101.pdf (trailer, file position 2996): attempting to recover stream length
WARNING: issue-101.pdf (trailer, file position 3410): attempting to recover stream length
WARNING: issue-101.pdf (trailer, file position 3631): attempting to recover stream length
WARNING: issue-101.pdf (trailer, file position 4184): attempting to recover stream length
issue-101.pdf (trailer, file position 4184): unable to recover stream data

5
qpdf/qtest/qpdf/issue-119.out
View File

@ -1,2 +1,3 @@
WARNING: issue-119.pdf (file position 336): loop detected resolving object 4 0
issue-119.pdf (file position 298): dictionary key is not not a name token
WARNING: issue-119.pdf (file position 298): expected dictionary key but found non-name object; inserting key /QPDFFake1
WARNING: issue-119.pdf (file position 298): expected dictionary key but found non-name object; inserting key /QPDFFake2
qpdf: operation succeeded with warnings; resulting file may have some problems