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Bug fix: handle generation > 0 when generating object streams

Browse Source 
Rework QPDFWriter to always track old object IDs and QPDFObjGen
instead of int, thus not discarding the generation number.  Switch to
QPDF::getCompressibleObjGen() to properly handle the case of an old
object eligible for compression that has a generation of other than
zero.
This commit is contained in:
Jay Berkenbilt 2013-06-14 14:53:47 -04:00
parent 96eb965115
commit a3576a7359
9 changed files with 284 additions and 84 deletions
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6
ChangeLog
View File

@ -1,5 +1,11 @@
2013-06-14 Jay Berkenbilt <ejb@ql.org>
* Bug fix: properly handle object stream generation when the
original file has some compressible objects with generation != 0.
* Add QPDF::getCompressibleObjGens() and deprecate
QPDF::getCompressibleObjects(), which had a flaw in its logic.
* Add new QPDFObjectHandle::getObjGen() method and indiciate in
comments that its use is favored over getObjectID() and
getGeneration() for most cases.

13
include/qpdf/QPDF.hh
View File

@ -434,8 +434,19 @@ class QPDF
// Map object to object stream that contains it
QPDF_DLL
void getObjectStreamData(std::map<int, int>&);
// Get a list of objects that would be permitted in an object
// stream
// stream.
QPDF_DLL
std::vector<QPDFObjGen> getCompressibleObjGens();
// Deprecated: get a list of objects that would be permitted in an
// object stream. This method is deprecated and will be removed.
// It's incorrect because it disregards the generations of the
// compressible objects, which can lead (and has lead) to bugs.
// This method will throw an exception if any of the objects
// returned have a generation of other than zero. Use
// getCompressibleObjGens() instead.
QPDF_DLL
std::vector<int> getCompressibleObjects();

22
include/qpdf/QPDFWriter.hh
View File

@ -24,6 +24,7 @@
#include <qpdf/Constants.h>
#include <qpdf/QPDFObjGen.hh>
#include <qpdf/QPDFXRefEntry.hh>
#include <qpdf/Pl_Buffer.hh>
@ -289,7 +290,7 @@ class QPDFWriter
void writeStringQDF(std::string const& str);
void writeStringNoQDF(std::string const& str);
void writePad(int nspaces);
void assignCompressedObjectNumbers(int objid);
void assignCompressedObjectNumbers(QPDFObjGen const& og);
void enqueueObject(QPDFObjectHandle object);
void writeObjectStreamOffsets(
std::vector<qpdf_offset_t>& offsets, int first_obj);
@ -380,6 +381,9 @@ class QPDFWriter
void pushEncryptionFilter();
void pushDiscardFilter();
void discardGeneration(std::map<QPDFObjGen, int> const& in,
std::map<int, int>& out);
QPDF& pdf;
char const* filename;
FILE* file;
@ -419,7 +423,7 @@ class QPDFWriter
std::list<PointerHolder<Pipeline> > to_delete;
Pl_Count* pipeline;
std::list<QPDFObjectHandle> object_queue;
std::map<int, int> obj_renumber;
std::map<QPDFObjGen, int> obj_renumber;
std::map<int, QPDFXRefEntry> xref;
std::map<int, qpdf_offset_t> lengths;
int next_objid;
@ -427,12 +431,16 @@ class QPDFWriter
size_t cur_stream_length;
bool added_newline;
int max_ostream_index;
std::set<int> normalized_streams;
std::map<int, int> page_object_to_seq;
std::map<int, int> contents_to_page_seq;
std::map<int, int> object_to_object_stream;
std::map<int, std::set<int> > object_stream_to_objects;
std::set<QPDFObjGen> normalized_streams;
std::map<QPDFObjGen, int> page_object_to_seq;
std::map<QPDFObjGen, int> contents_to_page_seq;
std::map<QPDFObjGen, int> object_to_object_stream;
std::map<int, std::set<QPDFObjGen> > object_stream_to_objects;
std::list<Pipeline*> pipeline_stack;
// For linearization only
std::map<int, int> obj_renumber_no_gen;
std::map<int, int> object_to_object_stream_no_gen;
};
#endif // __QPDFWRITER_HH__

59
libqpdf/QPDF.cc
View File

@ -1944,55 +1944,68 @@ QPDF::getObjectStreamData(std::map<int, int>& omap)
std::vector<int>
QPDF::getCompressibleObjects()
{
// Return a set of object numbers of objects that are allowed to
// be in object streams. We disregard generation numbers here
// since this is a helper function for QPDFWriter which is going
// to renumber objects anyway. This code will do weird things if
// we have two objects with the same object number and different
// generations, but so do virtually all PDF consumers,
// particularly since this is not a permitted condition.
std::vector<QPDFObjGen> objects = getCompressibleObjGens();
std::vector<int> result;
for (std::vector<QPDFObjGen>::iterator iter = objects.begin();
iter != objects.end(); ++iter)
{
if ((*iter).getGen() != 0)
{
throw std::logic_error(
"QPDF::getCompressibleObjects() would return an object ID"
" for an object with generation != 0. Use"
" QPDF::getCompressibleObjGens() instead."
" See comments in QPDF.hh.");
}
else
{
result.push_back((*iter).getObj());
}
}
return result;
}
// We walk through the objects by traversing the document from the
// root, including a traversal of the pages tree. This makes that
// objects that are on the same page are more likely to be in the
// same object stream, which is slightly more efficient,
std::vector<QPDFObjGen>
QPDF::getCompressibleObjGens()
{
// Return a list of objects that are allowed to be in object
// streams. Walk through the objects by traversing the document
// from the root, including a traversal of the pages tree. This
// makes that objects that are on the same page are more likely to
// be in the same object stream, which is slightly more efficient,
// particularly with linearized files. This is better than
// iterating through the xref table since it avoids preserving
// orphaned items.
// Exclude encryption dictionary, if any
int encryption_dict_id = 0;
QPDFObjectHandle encryption_dict = trailer.getKey("/Encrypt");
if (encryption_dict.isIndirect())
{
encryption_dict_id = encryption_dict.getObjectID();
}
QPDFObjGen encryption_dict_og = encryption_dict.getObjGen();
std::set<int> visited;
std::set<QPDFObjGen> visited;
std::list<QPDFObjectHandle> queue;
queue.push_front(this->trailer);
std::vector<int> result;
std::vector<QPDFObjGen> result;
while (! queue.empty())
{
QPDFObjectHandle obj = queue.front();
queue.pop_front();
if (obj.isIndirect())
{
int objid = obj.getObjectID();
if (visited.count(objid))
QPDFObjGen og = obj.getObjGen();
if (visited.count(og))
{
QTC::TC("qpdf", "QPDF loop detected traversing objects");
continue;
}
if (objid == encryption_dict_id)
if (og == encryption_dict_og)
{
QTC::TC("qpdf", "QPDF exclude encryption dictionary");
}
else if (! obj.isStream())
{
result.push_back(objid);
result.push_back(og);
}
visited.insert(objid);
visited.insert(og);
}
if (obj.isStream())
{

177
libqpdf/QPDFWriter.cc
View File

@ -933,16 +933,19 @@ QPDFWriter::closeObject(int objid)
}
void
QPDFWriter::assignCompressedObjectNumbers(int objid)
QPDFWriter::assignCompressedObjectNumbers(QPDFObjGen const& og)
{
if (this->object_stream_to_objects.count(objid) == 0)
int objid = og.getObj();
if ((og.getGen() != 0) ||
(this->object_stream_to_objects.count(objid) == 0))
{
// This is not an object stream.
return;
}
// Reserve numbers for the objects that belong to this object
// stream.
for (std::set<int>::iterator iter =
for (std::set<QPDFObjGen>::iterator iter =
this->object_stream_to_objects[objid].begin();
iter != this->object_stream_to_objects[objid].end();
++iter)
@ -969,30 +972,32 @@ QPDFWriter::enqueueObject(QPDFObjectHandle object)
{
// This is a place-holder object for an object stream
}
int objid = object.getObjectID();
QPDFObjGen og = object.getObjGen();
if (obj_renumber.count(objid) == 0)
if (obj_renumber.count(og) == 0)
{
if (this->object_to_object_stream.count(objid))
if (this->object_to_object_stream.count(og))
{
// This is in an object stream. Don't process it
// here. Instead, enqueue the object stream.
int stream_id = this->object_to_object_stream[objid];
// here. Instead, enqueue the object stream. Object
// streams always have generation 0.
int stream_id = this->object_to_object_stream[og];
enqueueObject(this->pdf.getObjectByID(stream_id, 0));
}
else
{
object_queue.push_back(object);
obj_renumber[objid] = next_objid++;
obj_renumber[og] = next_objid++;
if (this->object_stream_to_objects.count(objid))
if ((og.getGen() == 0) &&
this->object_stream_to_objects.count(og.getObj()))
{
// For linearized files, uncompressed objects go
// at end, and we take care of assigning numbers
// to them elsewhere.
if (! this->linearized)
{
assignCompressedObjectNumbers(objid);
assignCompressedObjectNumbers(og);
}
}
else if ((! this->direct_stream_lengths) && object.isStream())
@ -1041,8 +1046,8 @@ QPDFWriter::unparseChild(QPDFObjectHandle child, int level, int flags)
}
if (child.isIndirect())
{
int old_id = child.getObjectID();
int new_id = obj_renumber[old_id];
QPDFObjGen old_og = child.getObjGen();
int new_id = obj_renumber[old_og];
writeString(QUtil::int_to_string(new_id));
writeString(" 0 R");
}
@ -1134,7 +1139,7 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
unsigned int flags, size_t stream_length,
bool compress)
{
int old_id = object.getObjectID();
QPDFObjGen old_og = object.getObjGen();
unsigned int child_flags = flags & ~f_stream;
std::string indent;
@ -1201,7 +1206,7 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
bool have_extensions_adbe = false;
QPDFObjectHandle extensions;
if (old_id == pdf.getRoot().getObjectID())
if (old_og == pdf.getRoot().getObjGen())
{
is_root = true;
if (object.hasKey("/Extensions") &&
@ -1396,7 +1401,7 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
else if (object.isStream())
{
// Write stream data to a buffer.
int new_id = obj_renumber[old_id];
int new_id = obj_renumber[old_og];
if (! this->direct_stream_lengths)
{
this->cur_stream_length_id = new_id + 1;
@ -1436,7 +1441,7 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
filter = true;
compress = false;
}
else if (this->normalize_content && normalized_streams.count(old_id))
else if (this->normalize_content && normalized_streams.count(old_og))
{
normalize = true;
filter = true;
@ -1562,8 +1567,10 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
// Note: object might be null if this is a place-holder for an
// object stream that we are generating from scratch.
int old_id = object.getObjectID();
int new_id = obj_renumber[old_id];
QPDFObjGen old_og = object.getObjGen();
assert(old_og.getGen() == 0);
int old_id = old_og.getObj();
int new_id = obj_renumber[old_og];
std::vector<qpdf_offset_t> offsets;
qpdf_offset_t first = 0;
@ -1612,12 +1619,12 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
}
int count = 0;
for (std::set<int>::iterator iter =
for (std::set<QPDFObjGen>::iterator iter =
this->object_stream_to_objects[old_id].begin();
iter != this->object_stream_to_objects[old_id].end();
++iter, ++count)
{
int obj = *iter;
QPDFObjGen obj = *iter;
int new_obj = this->obj_renumber[obj];
if (first_obj == -1)
{
@ -1631,7 +1638,17 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
if (! this->suppress_original_object_ids)
{
writeString("; original object ID: " +
QUtil::int_to_string(obj));
QUtil::int_to_string(obj.getObj()));
// For compatibility, only write the generation if
// non-zero. While object streams only allow
// objects with generation 0, if we are generating
// object streams, the old object could have a
// non-zero generation.
if (obj.getGen() != 0)
{
QTC::TC("qpdf", "QPDFWriter original obj non-zero gen");
writeString(" " + QUtil::int_to_string(obj.getGen()));
}
}
writeString("\n");
}
@ -1639,7 +1656,7 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
{
offsets.push_back(this->pipeline->getCount());
}
writeObject(this->pdf.getObjectByID(obj, 0), count);
writeObject(this->pdf.getObjectByObjGen(obj), count);
this->xref[new_obj] = QPDFXRefEntry(2, new_id, count);
}
@ -1697,32 +1714,33 @@ QPDFWriter::writeObjectStream(QPDFObjectHandle object)
void
QPDFWriter::writeObject(QPDFObjectHandle object, int object_stream_index)
{
int old_id = object.getObjectID();
QPDFObjGen old_og = object.getObjGen();
if ((object_stream_index == -1) &&
(this->object_stream_to_objects.count(old_id)))
(old_og.getGen() == 0) &&
(this->object_stream_to_objects.count(old_og.getObj())))
{
writeObjectStream(object);
return;
}
int new_id = obj_renumber[old_id];
int new_id = obj_renumber[old_og];
if (this->qdf_mode)
{
if (this->page_object_to_seq.count(old_id))
if (this->page_object_to_seq.count(old_og))
{
writeString("%% Page ");
writeString(
QUtil::int_to_string(
this->page_object_to_seq[old_id]));
this->page_object_to_seq[old_og]));
writeString("\n");
}
if (this->contents_to_page_seq.count(old_id))
if (this->contents_to_page_seq.count(old_og))
{
writeString("%% Contents for page ");
writeString(
QUtil::int_to_string(
this->contents_to_page_seq[old_id]));
this->contents_to_page_seq[old_og]));
writeString("\n");
}
}
@ -1854,24 +1872,24 @@ QPDFWriter::initializeSpecialStreams()
iter != pages.end(); ++iter)
{
QPDFObjectHandle& page = *iter;
this->page_object_to_seq[page.getObjectID()] = ++num;
this->page_object_to_seq[page.getObjGen()] = ++num;
QPDFObjectHandle contents = page.getKey("/Contents");
std::vector<int> contents_objects;
std::vector<QPDFObjGen> contents_objects;
if (contents.isArray())
{
int n = contents.getArrayNItems();
for (int i = 0; i < n; ++i)
{
contents_objects.push_back(
contents.getArrayItem(i).getObjectID());
contents.getArrayItem(i).getObjGen());
}
}
else if (contents.isStream())
{
contents_objects.push_back(contents.getObjectID());
contents_objects.push_back(contents.getObjGen());
}
for (std::vector<int>::iterator iter = contents_objects.begin();
for (std::vector<QPDFObjGen>::iterator iter = contents_objects.begin();
iter != contents_objects.end(); ++iter)
{
this->contents_to_page_seq[*iter] = num;
@ -1883,7 +1901,20 @@ QPDFWriter::initializeSpecialStreams()
void
QPDFWriter::preserveObjectStreams()
{
this->pdf.getObjectStreamData(this->object_to_object_stream);
// Our object_to_object_stream map has to map ObjGen -> ObjGen
// since we may be generating object streams out of old objects
// that have generation numbers greater than zero. However in an
// existing PDF, all object stream objects and all objects in them
// must have generation 0 because the PDF spec does not provide
// any way to do otherwise.
std::map<int, int> omap;
this->pdf.getObjectStreamData(omap);
for (std::map<int, int>::iterator iter = omap.begin();
iter != omap.end(); ++iter)
{
this->object_to_object_stream[QPDFObjGen((*iter).first, 0)] =
(*iter).second;
}
}
void
@ -1899,7 +1930,8 @@ QPDFWriter::generateObjectStreams()
// This code doesn't do anything with /Extends.
std::vector<int> const& eligible = this->pdf.getCompressibleObjects();
std::vector<QPDFObjGen> const& eligible =
this->pdf.getCompressibleObjGens();
unsigned int n_object_streams = (eligible.size() + 99) / 100;
unsigned int n_per = eligible.size() / n_object_streams;
if (n_per * n_object_streams < eligible.size())
@ -1908,7 +1940,7 @@ QPDFWriter::generateObjectStreams()
}
unsigned int n = 0;
int cur_ostream = 0;
for (std::vector<int>::const_iterator iter = eligible.begin();
for (std::vector<QPDFObjGen>::const_iterator iter = eligible.begin();
iter != eligible.end(); ++iter)
{
if ((n % n_per) == 0)
@ -2172,11 +2204,11 @@ QPDFWriter::write()
iter != pages.end(); ++iter)
{
QPDFObjectHandle& page = *iter;
int objid = page.getObjectID();
if (this->object_to_object_stream.count(objid))
QPDFObjGen og = page.getObjGen();
if (this->object_to_object_stream.count(og))
{
QTC::TC("qpdf", "QPDFWriter uncompressing page dictionary");
this->object_to_object_stream.erase(objid);
this->object_to_object_stream.erase(og);
}
}
}
@ -2188,20 +2220,20 @@ QPDFWriter::write()
// 8.0.0 has a bug that prevents it from being able to handle
// encrypted files with compressed document catalogs, so we
// disable them in that case as well.
int objid = pdf.getRoot().getObjectID();
if (this->object_to_object_stream.count(objid))
QPDFObjGen og = pdf.getRoot().getObjGen();
if (this->object_to_object_stream.count(og))
{
QTC::TC("qpdf", "QPDFWriter uncompressing root");
this->object_to_object_stream.erase(objid);
this->object_to_object_stream.erase(og);
}
}
// Generate reverse mapping from object stream to objects
for (std::map<int, int>::iterator iter =
for (std::map<QPDFObjGen, int>::iterator iter =
this->object_to_object_stream.begin();
iter != this->object_to_object_stream.end(); ++iter)
{
int obj = (*iter).first;
QPDFObjGen obj = (*iter).first;
int stream = (*iter).second;
this->object_stream_to_objects[stream].insert(obj);
this->max_ostream_index =
@ -2303,7 +2335,8 @@ QPDFWriter::writeHintStream(int hint_id)
int S = 0;
int O = 0;
pdf.generateHintStream(
this->xref, this->lengths, this->obj_renumber, hint_buffer, S, O);
this->xref, this->lengths, this->obj_renumber_no_gen,
hint_buffer, S, O);
openObject(hint_id);
setDataKey(hint_id);
@ -2521,20 +2554,58 @@ QPDFWriter::calculateXrefStreamPadding(int xref_bytes)
return 16 + (5 * ((xref_bytes + 16383) / 16384));
}
void
QPDFWriter::discardGeneration(std::map<QPDFObjGen, int> const& in,
std::map<int, int>& out)
{
// There are deep assumptions in the linearization code in QPDF
// that there is only one object with each object number; i.e.,
// you can't have two objects with the same object number and
// different generations. This is a pretty safe assumption
// because Adobe Reader and Acrobat can't actually handle this
// case. There is not much if any code in QPDF outside
// linearization that assumes this, but the linearization code as
// currently implemented would do weird things if we found such a
// case. In order to avoid breaking ABI changes in QPDF, we will
// first assert that this condition holds. Then we can create new
// maps for QPDF that throw away generation numbers.
out.clear();
for (std::map<QPDFObjGen, int>::const_iterator iter = in.begin();
iter != in.end(); ++iter)
{
if (out.count((*iter).first.getObj()))
{
throw std::logic_error(
"QPDF cannot currently linearize files that contain"
" multiple objects with the same object ID and different"
" generations. If you see this error message, please file"
" a bug report and attach the file if possible. As a"
" workaround, first convert the file with qpdf without"
" linearizing, and then linearize the result of that"
" conversion.");
}
out[(*iter).first.getObj()] = (*iter).second;
}
}
void
QPDFWriter::writeLinearized()
{
// Optimize file and enqueue objects in order
discardGeneration(this->object_to_object_stream,
this->object_to_object_stream_no_gen);
bool need_xref_stream = (! this->object_to_object_stream.empty());
pdf.optimize(this->object_to_object_stream);
pdf.optimize(this->object_to_object_stream_no_gen);
std::vector<QPDFObjectHandle> part4;
std::vector<QPDFObjectHandle> part6;
std::vector<QPDFObjectHandle> part7;
std::vector<QPDFObjectHandle> part8;
std::vector<QPDFObjectHandle> part9;
pdf.getLinearizedParts(this->object_to_object_stream,
pdf.getLinearizedParts(this->object_to_object_stream_no_gen,
part4, part6, part7, part8, part9);
// Object number sequence:
@ -2570,7 +2641,7 @@ QPDFWriter::writeLinearized()
for (std::vector<QPDFObjectHandle>::iterator iter = (*vecs2[i]).begin();
iter != (*vecs2[i]).end(); ++iter)
{
assignCompressedObjectNumbers((*iter).getObjectID());
assignCompressedObjectNumbers((*iter).getObjGen());
}
}
int second_half_end = this->next_objid - 1;
@ -2602,7 +2673,7 @@ QPDFWriter::writeLinearized()
for (std::vector<QPDFObjectHandle>::iterator iter = (*vecs1[i]).begin();
iter != (*vecs1[i]).end(); ++iter)
{
assignCompressedObjectNumbers((*iter).getObjectID());
assignCompressedObjectNumbers((*iter).getObjGen());
}
}
int first_half_end = this->next_objid - 1;
@ -2660,7 +2731,7 @@ QPDFWriter::writeLinearized()
if (pass == 2)
{
std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
int first_page_object = obj_renumber[pages[0].getObjectID()];
int first_page_object = obj_renumber[pages[0].getObjGen()];
int npages = pages.size();
writeString(" /Linearized 1 /L ");
@ -2834,6 +2905,8 @@ QPDFWriter::writeLinearized()
writeString(QUtil::int_to_string(first_xref_offset));
writeString("\n%%EOF\n");
discardGeneration(this->obj_renumber, this->obj_renumber_no_gen);
if (pass == 1)
{
// Close first pass pipeline

1
qpdf/qpdf.testcov
View File

@ -262,3 +262,4 @@ qpdf-c called qpdf_set_r6_encryption_parameters 0
QPDFObjectHandle EOF in inline image 0
QPDFObjectHandle inline image token 0
QPDF not caching overridden objstm object 0
QPDFWriter original obj non-zero gen 0

11
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 += 62;
$n_tests += 64;
$td->runtest("qpdf version",
{$td->COMMAND => "qpdf --version"},
@ -501,6 +501,14 @@ $td->runtest("overridden compressed objects",
$td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("generate object streams for gen > 0",
{$td->COMMAND => "qpdf --qdf --static-id" .
" --object-streams=generate gen1.pdf a.pdf"},
{$td->STRING => "", $td->EXIT_STATUS => 0});
$td->runtest("check file",
{$td->FILE => "a.pdf"},
{$td->FILE => "gen1.qdf"});
show_ntests();
# ----------
$td->notify("--- Numeric range parsing tests ---");
@ -1183,6 +1191,7 @@ my @to_linearize =
'lin-delete-and-reuse', # linearized, then delete and reuse
'object-stream', # contains object streams
'hybrid-xref', # contains both xref tables and streams
'gen1', # has objects with generation > 0
@linearized_files, # we should be able to relinearize
);

79
qpdf/qtest/qpdf/gen1.pdf Normal file
View File

@ -0,0 +1,79 @@
%PDF-1.3
1 1 obj
<<
/Type /Catalog
/Pages 2 1 R
>>
endobj
2 1 obj
<<
/Type /Pages
/Kids [
3 1 R
]
/Count 1
>>
endobj
3 1 obj
<<
/Type /Page
/Parent 2 1 R
/MediaBox [0 0 612 792]
/Contents 4 1 R
/Resources <<
/ProcSet 5 1 R
/Font <<
/F1 6 1 R
>>
>>
>>
endobj
4 1 obj
<<
/Length 44
>>
stream
BT
/F1 24 Tf
72 720 Td
(Potato) Tj
ET
endstream
endobj
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