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Eliminate flattenScalarReferences
This commit is contained in:
Jay Berkenbilt
parent
b4b8b28ed2
commit
04c203ae06
18
ChangeLog
18
ChangeLog
@ -1,3 +1,21 @@
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2012-12-27 Jay Berkenbilt <ejb@ql.org>
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* Removed public method QPDF::flattenScalarReferences. Instead,
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just flatten the scalar references we actually need to flatten.
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Flattening scalar references was a wrong decision years ago and
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has occasionally caused other problems, among which were that it
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caused qpdf to visit otherwise unreferenced and possibly erroneous
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objects in the file when it didn't have to.
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* Removed public method QPDF::decodeStreams which was previously
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used by qpdf --check but is no longer used. The decodeStreams
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method could generate false positives since it would attempt to
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access all objects in the file including those that were not
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referenced.
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* Removed public method QPDF::trimTrailerForWrite, which was only
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intended for use by QPDFWriter and which is no longer used.
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2012-12-25 Jay Berkenbilt <ejb@ql.org>
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* Allow PDF header to appear anywhere in the first 1024 bytes of
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32
TODO
32
TODO
@ -41,38 +41,6 @@ General
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outlines, page labels, thumbnails, zones. There are probably
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others.
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* See whether it's possible to remove the call to
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flattenScalarReferences. I can't easily figure out why I do it,
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but removing it causes strange test failures in linearization. I
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would have to study the optimization and linearization code to
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figure out why I added this to begin with and what in the code
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assumes it's the case. For enqueueObject and unparseChild in
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QPDFWriter, simply removing the checks for indirect scalars seems
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sufficient. Looking back at the branch in the apex epub
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repository, before flattening scalar references, there was special
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case code in QPDFWriter to avoid writing out indirect nulls. It's
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still not obvious to me why I did it though.
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To pursue this, remove the call to flattenScalarReferences in
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QPDFWriter.cc and disable the logic_error exceptions for indirect
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scalars. Just search for flattenScalarReferences in QPDFWriter.cc
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since the logic errors have comments that mention
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flattenScalarReferences. Then run the test suite. Several files
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that explicitly test flattening of scalar references fail, but the
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indirect scalars are properly preserved and written. But then
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there are some linearized files that have a bunch of unreferenced
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objects that contain scalars. Need to figure out what these are
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and why they're there. Maybe they're objects that used to be
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stream lengths. Probably we just need to make sure don't traverse
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through a stream's /Length stream when enqueueing stream
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dictionaries. This could potentially happen with any object that
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QPDFWriter replaces when writing out files. Such objects would be
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orphaned in the newly written file. This could be fixed, but it
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may not be worth fixing.
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If flattenScalarReferences is removed, a new method will be needed
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for checking PDF files.
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* See if we can avoid preserving unreferenced objects in object
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streams even when preserving the object streams.
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@ -352,24 +352,8 @@ class QPDF
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void optimize(std::map<int, int> const& object_stream_data,
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bool allow_changes = true);
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// Replace all references to indirect objects that are "scalars"
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// (i.e., things that don't have children: not arrays, streams, or
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// dictionaries) with direct objects.
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QPDF_DLL
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void flattenScalarReferences();
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// Decode all streams, discarding the output. Used to check
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// correctness of stream encoding.
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QPDF_DLL
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void decodeStreams();
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// For QPDFWriter:
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// Remove /ID, /Encrypt, and /Prev keys from the trailer
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// dictionary since these are regenerated during write.
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QPDF_DLL
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void trimTrailerForWrite();
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// Get lists of all objects in order according to the part of a
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// linearized file that they belong to.
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QPDF_DLL
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@ -299,6 +299,7 @@ class QPDFWriter
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void setDataKey(int objid);
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int openObject(int objid = 0);
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void closeObject(int objid);
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void prepareFileForWrite();
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void writeStandard();
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void writeLinearized();
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void enqueuePart(std::vector<QPDFObjectHandle>& part);
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@ -206,7 +206,6 @@ debian
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declspec
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DecodeParms
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decodeRow
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decodeStreams
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decrypt
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decrypted
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decrypter
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@ -335,7 +334,6 @@ fl
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flate
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FlateDecode
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flattenPagesTree
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flattenScalarReferences
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fn
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fname
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fo
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@ -1860,28 +1860,6 @@ QPDF::swapObjects(int objid1, int generation1, int objid2, int generation2)
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this->obj_cache[og2] = t;
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}
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void
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QPDF::trimTrailerForWrite()
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{
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// Note that removing the encryption dictionary does not interfere
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// with reading encrypted files. QPDF loads all the information
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// it needs from the encryption dictionary at the beginning and
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// never looks at it again.
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this->trailer.removeKey("/ID");
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this->trailer.removeKey("/Encrypt");
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this->trailer.removeKey("/Prev");
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// Remove all trailer keys that potentially come from a
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// cross-reference stream
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this->trailer.removeKey("/Index");
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this->trailer.removeKey("/W");
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this->trailer.removeKey("/Length");
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this->trailer.removeKey("/Filter");
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this->trailer.removeKey("/DecodeParms");
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this->trailer.removeKey("/Type");
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this->trailer.removeKey("/XRefStm");
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}
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std::string
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QPDF::getFilename() const
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{
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@ -2067,20 +2045,3 @@ QPDF::pipeStreamData(int objid, int generation,
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}
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pipeline->finish();
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}
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void
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QPDF::decodeStreams()
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{
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for (std::map<ObjGen, QPDFXRefEntry>::iterator iter =
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this->xref_table.begin();
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iter != this->xref_table.end(); ++iter)
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{
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ObjGen const& og = (*iter).first;
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QPDFObjectHandle obj = getObjectByID(og.obj, og.gen);
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if (obj.isStream())
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{
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Pl_Discard pl;
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obj.pipeStreamData(&pl, true, false, false);
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}
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}
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}
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@ -834,16 +834,6 @@ QPDFWriter::enqueueObject(QPDFObjectHandle object)
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{
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// This is a place-holder object for an object stream
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}
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else if (object.isScalar())
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{
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// flattenScalarReferences is supposed to have removed all
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// indirect scalars.
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throw std::logic_error(
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"INTERNAL ERROR: QPDFWriter::enqueueObject: indirect scalar: " +
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std::string(this->filename) + " " +
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QUtil::int_to_string(object.getObjectID()) + " " +
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QUtil::int_to_string(object.getGeneration()));
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}
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int objid = object.getObjectID();
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if (obj_renumber.count(objid) == 0)
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@ -916,15 +906,6 @@ QPDFWriter::unparseChild(QPDFObjectHandle child, int level, int flags)
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}
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if (child.isIndirect())
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{
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if (child.isScalar())
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{
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// flattenScalarReferences is supposed to have removed all
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// indirect scalars.
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throw std::logic_error(
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"INTERNAL ERROR: QPDFWriter::unparseChild: indirect scalar: " +
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QUtil::int_to_string(child.getObjectID()) + " " +
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QUtil::int_to_string(child.getGeneration()));
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}
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int old_id = child.getObjectID();
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int new_id = obj_renumber[old_id];
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writeString(QUtil::int_to_string(new_id));
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@ -1647,6 +1628,117 @@ QPDFWriter::generateObjectStreams()
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}
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}
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void
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QPDFWriter::prepareFileForWrite()
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{
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// Remove keys from the trailer that necessarily have to be
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// replaced when writing the file.
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QPDFObjectHandle trailer = pdf.getTrailer();
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// Note that removing the encryption dictionary does not interfere
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// with reading encrypted files. QPDF loads all the information
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// it needs from the encryption dictionary at the beginning and
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// never looks at it again.
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trailer.removeKey("/ID");
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trailer.removeKey("/Encrypt");
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trailer.removeKey("/Prev");
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// Remove all trailer keys that potentially come from a
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// cross-reference stream
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trailer.removeKey("/Index");
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trailer.removeKey("/W");
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trailer.removeKey("/Length");
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trailer.removeKey("/Filter");
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trailer.removeKey("/DecodeParms");
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trailer.removeKey("/Type");
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trailer.removeKey("/XRefStm");
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// Do a traversal of the entire PDF file structure replacing all
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// indirect objects that QPDFWriter wants to be direct. This
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// includes stream lengths, stream filtering parameters, and
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// document extension level information. Also replace all
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// indirect null references with direct nulls. This way, the only
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// indirect nulls queued for output will be object stream place
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// holders.
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std::list<QPDFObjectHandle> queue;
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queue.push_back(pdf.getTrailer());
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std::set<int> visited;
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while (! queue.empty())
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{
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QPDFObjectHandle node = queue.front();
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queue.pop_front();
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if (node.isIndirect())
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{
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if (visited.count(node.getObjectID()) > 0)
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{
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continue;
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}
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visited.insert(node.getObjectID());
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}
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if (node.isArray())
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{
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int nitems = node.getArrayNItems();
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for (int i = 0; i < nitems; ++i)
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{
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QPDFObjectHandle oh = node.getArrayItem(i);
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if (oh.isIndirect() && oh.isNull())
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{
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QTC::TC("qpdf", "QPDFWriter flatten array null");
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oh.makeDirect();
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node.setArrayItem(i, oh);
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}
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else if (! oh.isScalar())
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{
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queue.push_back(oh);
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}
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}
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}
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else if (node.isDictionary() || node.isStream())
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{
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bool is_stream = false;
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QPDFObjectHandle dict = node;
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if (node.isStream())
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{
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is_stream = true;
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dict = node.getDict();
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}
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std::set<std::string> keys = dict.getKeys();
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for (std::set<std::string>::iterator iter = keys.begin();
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iter != keys.end(); ++iter)
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{
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std::string const& key = *iter;
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QPDFObjectHandle oh = dict.getKey(key);
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bool add_to_queue = true;
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if (oh.isIndirect())
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{
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if (is_stream)
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{
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if ((key == "/Length") ||
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(key == "/Filter") ||
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(key == "/DecodeParms"))
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{
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QTC::TC("qpdf", "QPDF make stream key direct");
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add_to_queue = false;
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oh.makeDirect();
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dict.replaceKey(key, oh);
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}
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}
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}
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if (add_to_queue)
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{
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queue.push_back(oh);
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}
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}
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}
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}
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}
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void
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QPDFWriter::write()
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{
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@ -1785,8 +1877,7 @@ QPDFWriter::write()
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generateID();
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pdf.trimTrailerForWrite();
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pdf.flattenScalarReferences();
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prepareFileForWrite();
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if (this->linearized)
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{
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@ -58,103 +58,6 @@ QPDF::ObjUser::operator<(ObjUser const& rhs) const
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return false;
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}
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void
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QPDF::flattenScalarReferences()
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{
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// Do a traversal of the entire PDF file structure replacing all
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// indirect objects that are not arrays, streams, or dictionaries
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// with direct objects.
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std::list<QPDFObjectHandle> queue;
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queue.push_back(this->trailer);
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std::set<ObjGen> visited;
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// Add every object in the xref table to the queue. This ensures
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// that we flatten scalar references in unreferenced objects.
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// This becomes important if we are preserving object streams in a
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// file that has unreferenced objects in its object streams. (See
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// QPDF bug 2974522 at SourceForge.)
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for (std::map<ObjGen, QPDFXRefEntry>::iterator iter =
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this->xref_table.begin();
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iter != this->xref_table.end(); ++iter)
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{
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ObjGen const& og = (*iter).first;
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queue.push_back(getObjectByID(og.obj, og.gen));
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}
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while (! queue.empty())
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{
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QPDFObjectHandle node = queue.front();
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queue.pop_front();
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if (node.isIndirect())
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{
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ObjGen og(node.getObjectID(), node.getGeneration());
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if (visited.count(og) > 0)
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{
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continue;
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}
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visited.insert(og);
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}
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if (node.isArray())
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{
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int nitems = node.getArrayNItems();
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for (int i = 0; i < nitems; ++i)
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{
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QPDFObjectHandle oh = node.getArrayItem(i);
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if (oh.isScalar())
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{
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if (oh.isIndirect())
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{
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QTC::TC("qpdf", "QPDF opt flatten array scalar");
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oh.makeDirect();
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node.setArrayItem(i, oh);
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}
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}
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else
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{
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queue.push_back(oh);
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}
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}
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}
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else if (node.isDictionary() || node.isStream())
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{
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QPDFObjectHandle dict = node;
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if (node.isStream())
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{
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dict = node.getDict();
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}
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std::set<std::string> keys = dict.getKeys();
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for (std::set<std::string>::iterator iter = keys.begin();
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iter != keys.end(); ++iter)
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{
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std::string const& key = *iter;
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QPDFObjectHandle oh = dict.getKey(key);
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if (oh.isNull())
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{
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// QPDF_Dictionary.getKeys() never returns null
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// keys.
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throw std::logic_error(
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"INTERNAL ERROR: dictionary with null key found");
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}
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else if (oh.isScalar())
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{
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if (oh.isIndirect())
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{
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QTC::TC("qpdf", "QPDF opt flatten dict scalar");
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oh.makeDirect();
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dict.replaceKey(key, oh);
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}
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}
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else
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{
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queue.push_back(oh);
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}
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}
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}
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}
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}
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void
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QPDF::optimize(std::map<int, int> const& object_stream_data,
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bool allow_changes)
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@ -304,9 +207,7 @@ QPDF::pushInheritedAttributesToPageInternal(
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}
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else
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{
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// Don't defeat flattenScalarReferences which
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// would have already been called by this
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// time.
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// It's okay to copy scalars.
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QTC::TC("qpdf", "QPDF opt inherited scalar");
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}
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}
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15
qpdf/qpdf.cc
15
qpdf/qpdf.cc
@ -8,6 +8,7 @@
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#include <qpdf/QUtil.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/Pl_StdioFile.hh>
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#include <qpdf/Pl_Discard.hh>
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#include <qpdf/PointerHolder.hh>
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#include <qpdf/QPDF.hh>
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@ -1381,12 +1382,14 @@ int main(int argc, char* argv[])
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else
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{
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std::cout << "File is not linearized\n";
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// calling flattenScalarReferences causes full
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// traversal of file, so any structural errors
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// would be exposed.
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pdf.flattenScalarReferences();
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// Also explicitly decode all streams.
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pdf.decodeStreams();
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// Write the file no nowhere, uncompressing
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// streams. This causes full file traversal
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// and decoding of all streams we can decode.
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QPDFWriter w(pdf);
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Pl_Discard discard;
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w.setOutputPipeline(&discard);
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w.setStreamDataMode(qpdf_s_uncompress);
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w.write();
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okay = true;
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}
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}
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@ -29,8 +29,7 @@ QPDF lin outlines in part 1
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QPDF lin nshared_total > nshared_first_page 1
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QPDF lin part 8 empty 1
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QPDF lin check shared past first page 0
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QPDF opt flatten array scalar 0
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QPDF opt flatten dict scalar 0
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QPDFWriter flatten array null 0
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main QTest implicit 0
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main QTest indirect 1
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main QTest null 0
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@ -244,3 +243,4 @@ QPDFWriter extra header text no newline 0
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QPDFWriter extra header text add newline 0
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QPDF bogus 0 offset 0
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QPDF global offset 0
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QPDF make stream key direct 0
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@ -18,7 +18,7 @@ endobj
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<01020300040560>
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(AB)
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]
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/indirect (hello)
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/indirect 4 0 R
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/nesting <<
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/a [
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1
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@ -58,17 +58,22 @@ endobj
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<<
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/Count 1
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/Kids [
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4 0 R
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5 0 R
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||||
]
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Binary file not shown.
Loading…
Reference in New Issue
Block a user