Eliminate flattenScalarReferences

Jay Berkenbilt
1 parent b4b8b28e
Showing 18 changed files with 260 additions and 305 deletions
ChangeLog
TODO
include/qpdf/QPDF.hh
include/qpdf/QPDFWriter.hh
ispell-words
libqpdf/QPDF.cc
libqpdf/QPDFWriter.cc
libqpdf/QPDF_optimization.cc
qpdf/qpdf.cc
qpdf/qpdf.testcov
qpdf/qtest/qpdf/good13.qdf
qpdf/qtest/qpdf/good5.qdf
qpdf/qtest/qpdf/good8.qdf
qpdf/qtest/qpdf/lin-special.disable.exp
qpdf/qtest/qpdf/lin-special.generate.exp
qpdf/qtest/qpdf/lin-special.preserve.exp
qpdf/qtest/qpdf/test4-1.qdf
qpdf/qtest/qpdf/unreferenced-indirect-scalar.out
+2012-12-27  Jay Berkenbilt  <ejb@ql.org>
+
+	* Removed public method QPDF::flattenScalarReferences.  Instead,
+	just flatten the scalar references we actually need to flatten.
+	Flattening scalar references was a wrong decision years ago and
+	has occasionally caused other problems, among which were that it
+	caused qpdf to visit otherwise unreferenced and possibly erroneous
+	objects in the file when it didn't have to.
+
+	* Removed public method QPDF::decodeStreams which was previously
+	used by qpdf --check but is no longer used.  The decodeStreams
+	method could generate false positives since it would attempt to
+	access all objects in the file including those that were not
+	referenced.
+
+	* Removed public method QPDF::trimTrailerForWrite, which was only
+	intended for use by QPDFWriter and which is no longer used.
+
 2012-12-25  Jay Berkenbilt  <ejb@ql.org>
 	* Allow PDF header to appear anywhere in the first 1024 bytes of
@@ -41,38 +41,6 @@ General
    outlines, page labels, thumbnails, zones.  There are probably
    others.
- * See whether it's possible to remove the call to
-   flattenScalarReferences.  I can't easily figure out why I do it,
-   but removing it causes strange test failures in linearization.  I
-   would have to study the optimization and linearization code to
-   figure out why I added this to begin with and what in the code
-   assumes it's the case.  For enqueueObject and unparseChild in
-   QPDFWriter, simply removing the checks for indirect scalars seems
-   sufficient.  Looking back at the branch in the apex epub
-   repository, before flattening scalar references, there was special
-   case code in QPDFWriter to avoid writing out indirect nulls.  It's
-   still not obvious to me why I did it though.
-
-   To pursue this, remove the call to flattenScalarReferences in
-   QPDFWriter.cc and disable the logic_error exceptions for indirect
-   scalars.  Just search for flattenScalarReferences in QPDFWriter.cc
-   since the logic errors have comments that mention
-   flattenScalarReferences.  Then run the test suite.  Several files
-   that explicitly test flattening of scalar references fail, but the
-   indirect scalars are properly preserved and written.  But then
-   there are some linearized files that have a bunch of unreferenced
-   objects that contain scalars.  Need to figure out what these are
-   and why they're there.  Maybe they're objects that used to be
-   stream lengths.  Probably we just need to make sure don't traverse
-   through a stream's /Length stream when enqueueing stream
-   dictionaries.  This could potentially happen with any object that
-   QPDFWriter replaces when writing out files.  Such objects would be
-   orphaned in the newly written file.  This could be fixed, but it
-   may not be worth fixing.
-
-   If flattenScalarReferences is removed, a new method will be needed
-   for checking PDF files.
-
  * See if we can avoid preserving unreferenced objects in object
    streams even when preserving the object streams.
@@ -352,24 +352,8 @@ class QPDF
     void optimize(std::map<int, int> const& object_stream_data,
 		  bool allow_changes = true);
-    // Replace all references to indirect objects that are "scalars"
-    // (i.e., things that don't have children: not arrays, streams, or
-    // dictionaries) with direct objects.
-    QPDF_DLL
-    void flattenScalarReferences();
-
-    // Decode all streams, discarding the output.  Used to check
-    // correctness of stream encoding.
-    QPDF_DLL
-    void decodeStreams();
-
     // For QPDFWriter:
-    // Remove /ID, /Encrypt, and /Prev keys from the trailer
-    // dictionary since these are regenerated during write.
-    QPDF_DLL
-    void trimTrailerForWrite();
-
     // Get lists of all objects in order according to the part of a
     // linearized file that they belong to.
     QPDF_DLL
@@ -299,6 +299,7 @@ class QPDFWriter
     void setDataKey(int objid);
     int openObject(int objid = 0);
     void closeObject(int objid);
+    void prepareFileForWrite();
     void writeStandard();
     void writeLinearized();
     void enqueuePart(std::vector<QPDFObjectHandle>& part);
@@ -206,7 +206,6 @@ debian
 declspec
 DecodeParms
 decodeRow
-decodeStreams
 decrypt
 decrypted
 decrypter
@@ -335,7 +334,6 @@ fl
 flate
 FlateDecode
 flattenPagesTree
-flattenScalarReferences
 fn
 fname
 fo
@@ -1860,28 +1860,6 @@ QPDF::swapObjects(int objid1, int generation1, int objid2, int generation2)
     this->obj_cache[og2] = t;
 }
-void
-QPDF::trimTrailerForWrite()
-{
-    // Note that removing the encryption dictionary does not interfere
-    // with reading encrypted files.  QPDF loads all the information
-    // it needs from the encryption dictionary at the beginning and
-    // never looks at it again.
-    this->trailer.removeKey("/ID");
-    this->trailer.removeKey("/Encrypt");
-    this->trailer.removeKey("/Prev");
-
-    // Remove all trailer keys that potentially come from a
-    // cross-reference stream
-    this->trailer.removeKey("/Index");
-    this->trailer.removeKey("/W");
-    this->trailer.removeKey("/Length");
-    this->trailer.removeKey("/Filter");
-    this->trailer.removeKey("/DecodeParms");
-    this->trailer.removeKey("/Type");
-    this->trailer.removeKey("/XRefStm");
-}
-
 std::string
 QPDF::getFilename() const
 {
@@ -2067,20 +2045,3 @@ QPDF::pipeStreamData(int objid, int generation,
     }
     pipeline->finish();
 }
-
-void
-QPDF::decodeStreams()
-{
-    for (std::map<ObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
-    {
-	ObjGen const& og = (*iter).first;
-	QPDFObjectHandle obj = getObjectByID(og.obj, og.gen);
-	if (obj.isStream())
-	{
-	    Pl_Discard pl;
-	    obj.pipeStreamData(&pl, true, false, false);
-	}
-    }
-}
@@ -834,16 +834,6 @@ QPDFWriter::enqueueObject(QPDFObjectHandle object)
 	{
 	    // This is a place-holder object for an object stream
 	}
-	else if (object.isScalar())
-	{
-	    // flattenScalarReferences is supposed to have removed all
-	    // indirect scalars.
-	    throw std::logic_error(
-		"INTERNAL ERROR: QPDFWriter::enqueueObject: indirect scalar: " +
-		std::string(this->filename) + " " +
-		QUtil::int_to_string(object.getObjectID()) + " " +
-		QUtil::int_to_string(object.getGeneration()));
-	}
 	int objid = object.getObjectID();
 	if (obj_renumber.count(objid) == 0)
@@ -916,15 +906,6 @@ QPDFWriter::unparseChild(QPDFObjectHandle child, int level, int flags)
     }
     if (child.isIndirect())
     {
-	if (child.isScalar())
-	{
-	    // flattenScalarReferences is supposed to have removed all
-	    // indirect scalars.
-	    throw std::logic_error(
-		"INTERNAL ERROR: QPDFWriter::unparseChild: indirect scalar: " +
-		QUtil::int_to_string(child.getObjectID()) + " " +
-		QUtil::int_to_string(child.getGeneration()));
-	}
 	int old_id = child.getObjectID();
 	int new_id = obj_renumber[old_id];
 	writeString(QUtil::int_to_string(new_id));
@@ -1648,6 +1629,117 @@ QPDFWriter::generateObjectStreams()
 }
 void
+QPDFWriter::prepareFileForWrite()
+{
+    // Remove keys from the trailer that necessarily have to be
+    // replaced when writing the file.
+
+    QPDFObjectHandle trailer = pdf.getTrailer();
+
+    // Note that removing the encryption dictionary does not interfere
+    // with reading encrypted files.  QPDF loads all the information
+    // it needs from the encryption dictionary at the beginning and
+    // never looks at it again.
+    trailer.removeKey("/ID");
+    trailer.removeKey("/Encrypt");
+    trailer.removeKey("/Prev");
+
+    // Remove all trailer keys that potentially come from a
+    // cross-reference stream
+    trailer.removeKey("/Index");
+    trailer.removeKey("/W");
+    trailer.removeKey("/Length");
+    trailer.removeKey("/Filter");
+    trailer.removeKey("/DecodeParms");
+    trailer.removeKey("/Type");
+    trailer.removeKey("/XRefStm");
+
+    // Do a traversal of the entire PDF file structure replacing all
+    // indirect objects that QPDFWriter wants to be direct.  This
+    // includes stream lengths, stream filtering parameters, and
+    // document extension level information.  Also replace all
+    // indirect null references with direct nulls.  This way, the only
+    // indirect nulls queued for output will be object stream place
+    // holders.
+
+    std::list<QPDFObjectHandle> queue;
+    queue.push_back(pdf.getTrailer());
+    std::set<int> visited;
+
+    while (! queue.empty())
+    {
+	QPDFObjectHandle node = queue.front();
+	queue.pop_front();
+	if (node.isIndirect())
+	{
+	    if (visited.count(node.getObjectID()) > 0)
+	    {
+		continue;
+	    }
+	    visited.insert(node.getObjectID());
+	}
+
+	if (node.isArray())
+	{
+	    int nitems = node.getArrayNItems();
+	    for (int i = 0; i < nitems; ++i)
+	    {
+		QPDFObjectHandle oh = node.getArrayItem(i);
+                if (oh.isIndirect() && oh.isNull())
+                {
+                    QTC::TC("qpdf", "QPDFWriter flatten array null");
+                    oh.makeDirect();
+                    node.setArrayItem(i, oh);
+                }
+		else if (! oh.isScalar())
+		{
+		    queue.push_back(oh);
+		}
+	    }
+	}
+	else if (node.isDictionary() || node.isStream())
+	{
+            bool is_stream = false;
+	    QPDFObjectHandle dict = node;
+	    if (node.isStream())
+	    {
+                is_stream = true;
+		dict = node.getDict();
+	    }
+
+	    std::set<std::string> keys = dict.getKeys();
+	    for (std::set<std::string>::iterator iter = keys.begin();
+		 iter != keys.end(); ++iter)
+	    {
+		std::string const& key = *iter;
+		QPDFObjectHandle oh = dict.getKey(key);
+                bool add_to_queue = true;
+                if (oh.isIndirect())
+                {
+                    if (is_stream)
+                    {
+                        if ((key == "/Length") ||
+                            (key == "/Filter") ||
+                            (key == "/DecodeParms"))
+                        {
+                            QTC::TC("qpdf", "QPDF make stream key direct");
+                            add_to_queue = false;
+                            oh.makeDirect();
+                            dict.replaceKey(key, oh);
+                        }
+                    }
+                }
+
+                if (add_to_queue)
+                {
+                    queue.push_back(oh);
+		}
+	    }
+	}
+    }
+}
+
+void
 QPDFWriter::write()
 {
     // Do preliminary setup
@@ -1785,8 +1877,7 @@ QPDFWriter::write()
     generateID();
-    pdf.trimTrailerForWrite();
-    pdf.flattenScalarReferences();
+    prepareFileForWrite();
     if (this->linearized)
     {
@@ -59,103 +59,6 @@ QPDF::ObjUser::operator&lt;(ObjUser const&amp; rhs) const
 }
 void
-QPDF::flattenScalarReferences()
-{
-    // Do a traversal of the entire PDF file structure replacing all
-    // indirect objects that are not arrays, streams, or dictionaries
-    // with direct objects.
-
-    std::list<QPDFObjectHandle> queue;
-    queue.push_back(this->trailer);
-    std::set<ObjGen> visited;
-
-    // Add every object in the xref table to the queue.  This ensures
-    // that we flatten scalar references in unreferenced objects.
-    // This becomes important if we are preserving object streams in a
-    // file that has unreferenced objects in its object streams.  (See
-    // QPDF bug 2974522 at SourceForge.)
-    for (std::map<ObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
-    {
-	ObjGen const& og = (*iter).first;
-	queue.push_back(getObjectByID(og.obj, og.gen));
-    }
-
-    while (! queue.empty())
-    {
-	QPDFObjectHandle node = queue.front();
-	queue.pop_front();
-	if (node.isIndirect())
-	{
-	    ObjGen og(node.getObjectID(), node.getGeneration());
-	    if (visited.count(og) > 0)
-	    {
-		continue;
-	    }
-	    visited.insert(og);
-	}
-
-	if (node.isArray())
-	{
-	    int nitems = node.getArrayNItems();
-	    for (int i = 0; i < nitems; ++i)
-	    {
-		QPDFObjectHandle oh = node.getArrayItem(i);
-		if (oh.isScalar())
-		{
-		    if (oh.isIndirect())
-		    {
-			QTC::TC("qpdf", "QPDF opt flatten array scalar");
-			oh.makeDirect();
-			node.setArrayItem(i, oh);
-		    }
-		}
-		else
-		{
-		    queue.push_back(oh);
-		}
-	    }
-	}
-	else if (node.isDictionary() || node.isStream())
-	{
-	    QPDFObjectHandle dict = node;
-	    if (node.isStream())
-	    {
-		dict = node.getDict();
-	    }
-	    std::set<std::string> keys = dict.getKeys();
-	    for (std::set<std::string>::iterator iter = keys.begin();
-		 iter != keys.end(); ++iter)
-	    {
-		std::string const& key = *iter;
-		QPDFObjectHandle oh = dict.getKey(key);
-		if (oh.isNull())
-		{
-		    // QPDF_Dictionary.getKeys() never returns null
-		    // keys.
-		    throw std::logic_error(
-			"INTERNAL ERROR: dictionary with null key found");
-		}
-		else if (oh.isScalar())
-		{
-		    if (oh.isIndirect())
-		    {
-			QTC::TC("qpdf", "QPDF opt flatten dict scalar");
-			oh.makeDirect();
-			dict.replaceKey(key, oh);
-		    }
-		}
-		else
-		{
-		    queue.push_back(oh);
-		}
-	    }
-	}
-    }
-}
-
-void
 QPDF::optimize(std::map<int, int> const& object_stream_data,
 	       bool allow_changes)
 {
@@ -304,9 +207,7 @@ QPDF::pushInheritedAttributesToPageInternal(
 		    }
 		    else
 		    {
-			// Don't defeat flattenScalarReferences which
-			// would have already been called by this
-			// time.
+			// It's okay to copy scalars.
 			QTC::TC("qpdf", "QPDF opt inherited scalar");
 		    }
 		}
@@ -8,6 +8,7 @@
 #include <qpdf/QUtil.hh>
 #include <qpdf/QTC.hh>
 #include <qpdf/Pl_StdioFile.hh>
+#include <qpdf/Pl_Discard.hh>
 #include <qpdf/PointerHolder.hh>
 #include <qpdf/QPDF.hh>
@@ -1381,12 +1382,14 @@ int main(int argc, char* argv[])
 		    else
 		    {
 			std::cout << "File is not linearized\n";
-			// calling flattenScalarReferences causes full
-			// traversal of file, so any structural errors
-			// would be exposed.
-			pdf.flattenScalarReferences();
-			// Also explicitly decode all streams.
-			pdf.decodeStreams();
+                        // Write the file no nowhere, uncompressing
+                        // streams.  This causes full file traversal
+                        // and decoding of all streams we can decode.
+                        QPDFWriter w(pdf);
+                        Pl_Discard discard;
+                        w.setOutputPipeline(&discard);
+                        w.setStreamDataMode(qpdf_s_uncompress);
+                        w.write();
 			okay = true;
 		    }
 		}
@@ -29,8 +29,7 @@ QPDF lin outlines in part 1
 QPDF lin nshared_total > nshared_first_page 1
 QPDF lin part 8 empty 1
 QPDF lin check shared past first page 0
-QPDF opt flatten array scalar 0
-QPDF opt flatten dict scalar 0
+QPDFWriter flatten array null 0
 main QTest implicit 0
 main QTest indirect 1
 main QTest null 0
@@ -244,3 +243,4 @@ QPDFWriter extra header text no newline 0
 QPDFWriter extra header text add newline 0
 QPDF bogus 0 offset 0
 QPDF global offset 0
+QPDF make stream key direct 0
@@ -18,7 +18,7 @@ endobj
     <01020300040560>
     (AB)
   ]
-  /indirect (hello)
+  /indirect 4 0 R
   /nesting <<
     /a [
       1
@@ -58,17 +58,22 @@ endobj
 <<
   /Count 1
   /Kids [
-    4 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
 endobj
+%% Original object ID: 8 0
+4 0 obj
+(hello)
+endobj
+
 %% Page 1
 %% Original object ID: 3 0
-4 0 obj
+5 0 obj
 <<
-  /Contents 5 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -78,9 +83,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 7 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 8 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -88,9 +93,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-5 0 obj
+6 0 obj
 <<
-  /Length 6 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -101,12 +106,12 @@ ET
 endstream
 endobj
-6 0 obj
+7 0 obj
 44
 endobj
 %% Original object ID: 6 0
-7 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -117,7 +122,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-8 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -125,22 +130,23 @@ endobj
 endobj
 xref
-0 9
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000578 00000 n 
-0000000687 00000 n 
-0000000929 00000 n 
-0000001028 00000 n 
-0000001074 00000 n 
-0000001219 00000 n 
+0000000576 00000 n 
+0000000675 00000 n 
+0000000736 00000 n 
+0000000978 00000 n 
+0000001077 00000 n 
+0000001123 00000 n 
+0000001268 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 9
+  /Size 10
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1254
+1303
 %%EOF
@@ -5,17 +5,22 @@
 %% Original object ID: 1 0
 1 0 obj
 <<
-  /Pages 2 0 R
+  /Pages 3 0 R
   /Type /Catalog
 >>
 endobj
-%% Original object ID: 2 0
+%% Original object ID: 7 0
 2 0 obj
+true
+endobj
+
+%% Original object ID: 2 0
+3 0 obj
 <<
   /Count 1
   /Kids [
-    3 0 R
+    4 0 R
   ]
   /Type /Pages
 >>
@@ -23,21 +28,21 @@ endobj
 %% Page 1
 %% Original object ID: 3 0
-3 0 obj
+4 0 obj
 <<
-  /Contents 4 0 R
+  /Contents 5 0 R
   /MediaBox [
     0
     0
     612
     792
   ]
-  /Parent 2 0 R
+  /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 6 0 R
+      /F1 7 0 R
     >>
-    /ProcSet 7 0 R
+    /ProcSet 8 0 R
   >>
   /Type /Page
 >>
@@ -45,9 +50,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-4 0 obj
+5 0 obj
 <<
-  /Length 5 0 R
+  /Length 6 0 R
 >>
 stream
 BT
@@ -58,12 +63,12 @@ ET
 endstream
 endobj
-5 0 obj
+6 0 obj
 44
 endobj
 %% Original object ID: 6 0
-6 0 obj
+7 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -74,7 +79,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-7 0 obj
+8 0 obj
 [
   /PDF
   /Text
@@ -82,21 +87,22 @@ endobj
 endobj
 xref
-0 8
+0 9
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000242 00000 n 
-0000000484 00000 n 
-0000000583 00000 n 
-0000000629 00000 n 
-0000000774 00000 n 
+0000000181 00000 n 
+0000000290 00000 n 
+0000000532 00000 n 
+0000000631 00000 n 
+0000000677 00000 n 
+0000000822 00000 n 
 trailer <<
-  /QTest true
+  /QTest 2 0 R
   /Root 1 0 R
-  /Size 8
+  /Size 9
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-809
+857
 %%EOF
@@ -5,17 +5,22 @@
 %% Original object ID: 1 0
 1 0 obj
 <<
-  /Pages 2 0 R
+  /Pages 3 0 R
   /Type /Catalog
 >>
 endobj
-%% Original object ID: 2 0
+%% Original object ID: 7 0
 2 0 obj
+3.14159
+endobj
+
+%% Original object ID: 2 0
+3 0 obj
 <<
   /Count 1
   /Kids [
-    3 0 R
+    4 0 R
   ]
   /Type /Pages
 >>
@@ -23,21 +28,21 @@ endobj
 %% Page 1
 %% Original object ID: 3 0
-3 0 obj
+4 0 obj
 <<
-  /Contents 4 0 R
+  /Contents 5 0 R
   /MediaBox [
     0
     0
     612
     792
   ]
-  /Parent 2 0 R
+  /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 6 0 R
+      /F1 7 0 R
     >>
-    /ProcSet 7 0 R
+    /ProcSet 8 0 R
   >>
   /Type /Page
 >>
@@ -45,9 +50,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-4 0 obj
+5 0 obj
 <<
-  /Length 5 0 R
+  /Length 6 0 R
 >>
 stream
 BT
@@ -58,12 +63,12 @@ ET
 endstream
 endobj
-5 0 obj
+6 0 obj
 44
 endobj
 %% Original object ID: 6 0
-6 0 obj
+7 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -74,7 +79,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-7 0 obj
+8 0 obj
 [
   /PDF
   /Text
@@ -82,21 +87,22 @@ endobj
 endobj
 xref
-0 8
+0 9
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000242 00000 n 
-0000000484 00000 n 
-0000000583 00000 n 
-0000000629 00000 n 
-0000000774 00000 n 
+0000000184 00000 n 
+0000000293 00000 n 
+0000000535 00000 n 
+0000000634 00000 n 
+0000000680 00000 n 
+0000000825 00000 n 
 trailer <<
-  /QTest 3.14159
+  /QTest 2 0 R
   /Root 1 0 R
-  /Size 8
+  /Size 9
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-809
+860
 %%EOF
@@ -39,8 +39,8 @@ endobj
 <<
   /A 5 0 R
   /B 6 0 R
-  /Subject (Subject)
-  /Title (Some Title Is Here)
+  /Subject 7 0 R
+  /Title 8 0 R
 >>
 endobj
@@ -49,7 +49,7 @@ endobj
 <<
   /Count 1
   /Kids [
-    7 0 R
+    9 0 R
   ]
   /Type /Pages
 >>
@@ -72,11 +72,21 @@ endobj
 >>
 endobj
+%% Original object ID: 10 0
+7 0 obj
+(Subject)
+endobj
+
+%% Original object ID: 9 0
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