Push QPDF member variables into a nested class

Pushing member variables into a nested class enables addition of new member variables without breaking binary compatibility.

Push QPDF member variables into a nested class
Pushing member variables into a nested class enables addition of new member variables without breaking binary compatibility.
Jay Berkenbilt
1 parent 8288a4eb
Showing 6 changed files with 744 additions and 694 deletions
include/qpdf/QPDF.hh
libqpdf/QPDF.cc
libqpdf/QPDF_encryption.cc
libqpdf/QPDF_linearization.cc
libqpdf/QPDF_optimization.cc
libqpdf/QPDF_pages.cc
@@ -635,11 +635,11 @@ class QPDF
             qpdf(qpdf),
             og(og)
         {
-            qpdf->resolving.insert(og);
+            qpdf->m->resolving.insert(og);
         }
         virtual ~ResolveRecorder()
         {
-            this->qpdf->resolving.erase(og);
+            this->qpdf->m->resolving.erase(og);
         }
       private:
         QPDF* qpdf;
@@ -1113,79 +1113,95 @@ class QPDF
 				  std::set<QPDFObjGen>& visited, bool top);
     void filterCompressedObjects(std::map<int, int> const& object_stream_data);
+    class Members
+    {
+        friend class QPDF;
+
+      public:
+        ~Members();
+
+      private:
+        Members();
+        Members(Members const&);
+
+        QPDFTokenizer tokenizer;
+        PointerHolder<InputSource> file;
+        std::string last_object_description;
+        bool encrypted;
+        bool encryption_initialized;
+        bool ignore_xref_streams;
+        bool suppress_warnings;
+        std::ostream* out_stream;
+        std::ostream* err_stream;
+        bool attempt_recovery;
+        int encryption_V;
+        int encryption_R;
+        bool encrypt_metadata;
+        std::map<std::string, encryption_method_e> crypt_filters;
+        encryption_method_e cf_stream;
+        encryption_method_e cf_string;
+        encryption_method_e cf_file;
+        std::string provided_password;
+        std::string user_password;
+        std::string encryption_key;
+        std::string cached_object_encryption_key;
+        int cached_key_objid;
+        int cached_key_generation;
+        std::string pdf_version;
+        std::map<QPDFObjGen, QPDFXRefEntry> xref_table;
+        std::set<int> deleted_objects;
+        std::map<QPDFObjGen, ObjCache> obj_cache;
+        std::set<QPDFObjGen> resolving;
+        QPDFObjectHandle trailer;
+        std::vector<QPDFObjectHandle> all_pages;
+        std::map<QPDFObjGen, int> pageobj_to_pages_pos;
+        bool pushed_inherited_attributes_to_pages;
+        std::vector<QPDFExc> warnings;
+        std::map<QPDF*, ObjCopier> object_copiers;
+        PointerHolder<QPDFObjectHandle::StreamDataProvider> copied_streams;
+        // copied_stream_data_provider is owned by copied_streams
+        CopiedStreamDataProvider* copied_stream_data_provider;
+        std::set<QPDFObjGen> attachment_streams;
+        bool reconstructed_xref;
+
+        // Linearization data
+        qpdf_offset_t first_xref_item_offset; // actual value from file
+        bool uncompressed_after_compressed;
+
+        // Linearization parameter dictionary and hint table data: may be
+        // read from file or computed prior to writing a linearized file
+        QPDFObjectHandle lindict;
+        LinParameters linp;
+        HPageOffset page_offset_hints;
+        HSharedObject shared_object_hints;
+        HGeneric outline_hints;
+
+        // Computed linearization data: used to populate above tables
+        // during writing and to compare with them during validation.
+        // c_ means computed.
+        LinParameters c_linp;
+        CHPageOffset c_page_offset_data;
+        CHSharedObject c_shared_object_data;
+        HGeneric c_outline_data;
+
+        // Object ordering data for linearized files: initialized by
+        // calculateLinearizationData().  Part numbers refer to the PDF
+        // 1.4 specification.
+        std::vector<QPDFObjectHandle> part4;
+        std::vector<QPDFObjectHandle> part6;
+        std::vector<QPDFObjectHandle> part7;
+        std::vector<QPDFObjectHandle> part8;
+        std::vector<QPDFObjectHandle> part9;
+
+        // Optimization data
+        std::map<ObjUser, std::set<QPDFObjGen> > obj_user_to_objects;
+        std::map<QPDFObjGen, std::set<ObjUser> > object_to_obj_users;
+    };
-    QPDFTokenizer tokenizer;
-    PointerHolder<InputSource> file;
-    std::string last_object_description;
-    bool encrypted;
-    bool encryption_initialized;
-    bool ignore_xref_streams;
-    bool suppress_warnings;
-    std::ostream* out_stream;
-    std::ostream* err_stream;
-    bool attempt_recovery;
-    int encryption_V;
-    int encryption_R;
-    bool encrypt_metadata;
-    std::map<std::string, encryption_method_e> crypt_filters;
-    encryption_method_e cf_stream;
-    encryption_method_e cf_string;
-    encryption_method_e cf_file;
-    std::string provided_password;
-    std::string user_password;
-    std::string encryption_key;
-    std::string cached_object_encryption_key;
-    int cached_key_objid;
-    int cached_key_generation;
-    std::string pdf_version;
-    std::map<QPDFObjGen, QPDFXRefEntry> xref_table;
-    std::set<int> deleted_objects;
-    std::map<QPDFObjGen, ObjCache> obj_cache;
-    std::set<QPDFObjGen> resolving;
-    QPDFObjectHandle trailer;
-    std::vector<QPDFObjectHandle> all_pages;
-    std::map<QPDFObjGen, int> pageobj_to_pages_pos;
-    bool pushed_inherited_attributes_to_pages;
-    std::vector<QPDFExc> warnings;
-    std::map<QPDF*, ObjCopier> object_copiers;
-    PointerHolder<QPDFObjectHandle::StreamDataProvider> copied_streams;
-    // copied_stream_data_provider is owned by copied_streams
-    CopiedStreamDataProvider* copied_stream_data_provider;
-    std::set<QPDFObjGen> attachment_streams;
-    bool reconstructed_xref;
-
-    // Linearization data
-    qpdf_offset_t first_xref_item_offset; // actual value from file
-    bool uncompressed_after_compressed;
-
-    // Linearization parameter dictionary and hint table data: may be
-    // read from file or computed prior to writing a linearized file
-    QPDFObjectHandle lindict;
-    LinParameters linp;
-    HPageOffset page_offset_hints;
-    HSharedObject shared_object_hints;
-    HGeneric outline_hints;
-
-    // Computed linearization data: used to populate above tables
-    // during writing and to compare with them during validation.  c_
-    // means computed.
-    LinParameters c_linp;
-    CHPageOffset c_page_offset_data;
-    CHSharedObject c_shared_object_data;
-    HGeneric c_outline_data;
-
-    // Object ordering data for linearized files: initialized by
-    // calculateLinearizationData().  Part numbers refer to the PDF
-    // 1.4 specification.
-    std::vector<QPDFObjectHandle> part4;
-    std::vector<QPDFObjectHandle> part6;
-    std::vector<QPDFObjectHandle> part7;
-    std::vector<QPDFObjectHandle> part8;
-    std::vector<QPDFObjectHandle> part9;
-
-    // Optimization data
-    std::map<ObjUser, std::set<QPDFObjGen> > obj_user_to_objects;
-    std::map<QPDFObjGen, std::set<ObjUser> > object_to_obj_users;
+    // Keep all member variables inside the Members object, which we
+    // dynamically allocate. This makes it possible to add new private
+    // members without breaking binary compatibility.
+    PointerHolder<Members> m;
 };
 #endif // __QPDF_HH__
@@ -74,7 +74,7 @@ QPDF::QPDFVersion()
     return QPDF::qpdf_version;
 }
-QPDF::QPDF() :
+QPDF::Members::Members() :
     encrypted(false),
     encryption_initialized(false),
     ignore_xref_streams(false),
@@ -98,6 +98,15 @@ QPDF::QPDF() :
 {
 }
+QPDF::Members::~Members()
+{
+}
+
+QPDF::QPDF() :
+    m(new Members())
+{
+}
+
 QPDF::~QPDF()
 {
     // If two objects are mutually referential (through each object
@@ -114,10 +123,10 @@ QPDF::~QPDF()
     // reference will reread the object from the file, which would
     // have the effect of undoing any modifications that may have been
     // made to any of the objects.
-    this->xref_table.clear();
+    this->m->xref_table.clear();
     for (std::map<QPDFObjGen, ObjCache>::iterator iter =
-             this->obj_cache.begin();
-	 iter != obj_cache.end(); ++iter)
+             this->m->obj_cache.begin();
+	 iter != this->m->obj_cache.end(); ++iter)
     {
 	QPDFObject::ObjAccessor::releaseResolved(
 	    (*iter).second.object.getPointer());
@@ -158,7 +167,7 @@ void
 QPDF::processInputSource(PointerHolder<InputSource> source,
                          char const* password)
 {
-    this->file = source;
+    this->m->file = source;
     parse(password);
 }
@@ -171,41 +180,41 @@ QPDF::emptyPDF()
 void
 QPDF::setIgnoreXRefStreams(bool val)
 {
-    this->ignore_xref_streams = val;
+    this->m->ignore_xref_streams = val;
 }
 void
 QPDF::setOutputStreams(std::ostream* out, std::ostream* err)
 {
-    this->out_stream = out ? out : &std::cout;
-    this->err_stream = err ? err : &std::cerr;
+    this->m->out_stream = out ? out : &std::cout;
+    this->m->err_stream = err ? err : &std::cerr;
 }
 void
 QPDF::setSuppressWarnings(bool val)
 {
-    this->suppress_warnings = val;
+    this->m->suppress_warnings = val;
 }
 void
 QPDF::setAttemptRecovery(bool val)
 {
-    this->attempt_recovery = val;
+    this->m->attempt_recovery = val;
 }
 std::vector<QPDFExc>
 QPDF::getWarnings()
 {
-    std::vector<QPDFExc> result = this->warnings;
-    this->warnings.clear();
+    std::vector<QPDFExc> result = this->m->warnings;
+    this->m->warnings.clear();
     return result;
 }
 bool
 QPDF::findHeader()
 {
-    qpdf_offset_t global_offset = this->file->tell();
-    std::string line = this->file->readLine(1024);
+    qpdf_offset_t global_offset = this->m->file->tell();
+    std::string line = this->m->file->readLine(1024);
     char const* p = line.c_str();
     if (strncmp(p, "%PDF-", 5) != 0)
     {
@@ -239,7 +248,7 @@ QPDF::findHeader()
     }
     if (valid)
     {
-        this->pdf_version = version;
+        this->m->pdf_version = version;
         if (global_offset != 0)
         {
             // Empirical evidence strongly suggests that when there is
@@ -247,7 +256,7 @@ QPDF::findHeader()
             // offsets in the file are such that 0 points to the
             // beginning of the header.
             QTC::TC("qpdf", "QPDF global offset");
-            this->file = new OffsetInputSource(this->file, global_offset);
+            this->m->file = new OffsetInputSource(this->m->file, global_offset);
         }
     }
     return valid;
@@ -256,14 +265,14 @@ QPDF::findHeader()
 bool
 QPDF::findStartxref()
 {
-    QPDFTokenizer::Token t = readToken(this->file, true);
+    QPDFTokenizer::Token t = readToken(this->m->file, true);
     if (t == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "startxref"))
     {
-        t = readToken(this->file, true);
+        t = readToken(this->m->file, true);
         if (t.getType() == QPDFTokenizer::tt_integer)
         {
             // Position in front of offset token
-            this->file->seek(this->file->getLastOffset(), SEEK_SET);
+            this->m->file->seek(this->m->file->getLastOffset(), SEEK_SET);
             return true;
         }
     }
@@ -275,37 +284,37 @@ QPDF::parse(char const* password)
 {
     if (password)
     {
-	this->provided_password = password;
+	this->m->provided_password = password;
     }
     // Find the header anywhere in the first 1024 bytes of the file.
     PatternFinder hf(*this, &QPDF::findHeader);
-    if (! this->file->findFirst("%PDF-", 0, 1024, hf))
+    if (! this->m->file->findFirst("%PDF-", 0, 1024, hf))
     {
 	QTC::TC("qpdf", "QPDF not a pdf file");
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                      "", 0, "can't find PDF header"));
         // QPDFWriter writes files that usually require at least
         // version 1.2 for /FlateDecode
-        this->pdf_version = "1.2";
+        this->m->pdf_version = "1.2";
     }
-    if (atof(this->pdf_version.c_str()) < 1.2)
+    if (atof(this->m->pdf_version.c_str()) < 1.2)
     {
-        this->tokenizer.allowPoundAnywhereInName();
+        this->m->tokenizer.allowPoundAnywhereInName();
     }
     // PDF spec says %%EOF must be found within the last 1024 bytes of
     // the file.  We add an extra 30 characters to leave room for the
     // startxref stuff.
-    this->file->seek(0, SEEK_END);
-    qpdf_offset_t end_offset = this->file->tell();
+    this->m->file->seek(0, SEEK_END);
+    qpdf_offset_t end_offset = this->m->file->tell();
     qpdf_offset_t start_offset = (end_offset > 1054 ? end_offset - 1054 : 0);
     PatternFinder sf(*this, &QPDF::findStartxref);
     qpdf_offset_t xref_offset = 0;
-    if (this->file->findLast("startxref", start_offset, 0, sf))
+    if (this->m->file->findLast("startxref", start_offset, 0, sf))
     {
         xref_offset = QUtil::string_to_ll(
-            readToken(this->file).getValue().c_str());
+            readToken(this->m->file).getValue().c_str());
     }
     try
@@ -313,14 +322,14 @@ QPDF::parse(char const* password)
 	if (xref_offset == 0)
 	{
 	    QTC::TC("qpdf", "QPDF can't find startxref");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
 			  "can't find startxref");
 	}
 	read_xref(xref_offset);
     }
     catch (QPDFExc& e)
     {
-	if (this->attempt_recovery)
+	if (this->m->attempt_recovery)
 	{
 	    reconstruct_xref(e);
 	    QTC::TC("qpdf", "QPDF reconstructed xref table");
@@ -338,28 +347,29 @@ QPDF::parse(char const* password)
 void
 QPDF::warn(QPDFExc const& e)
 {
-    this->warnings.push_back(e);
-    if (! this->suppress_warnings)
+    this->m->warnings.push_back(e);
+    if (! this->m->suppress_warnings)
     {
-	*err_stream << "WARNING: "
-		    << this->warnings.back().what() << std::endl;
+	*this->m->err_stream
+            << "WARNING: "
+            << this->m->warnings.back().what() << std::endl;
     }
 }
 void
 QPDF::setTrailer(QPDFObjectHandle obj)
 {
-    if (this->trailer.isInitialized())
+    if (this->m->trailer.isInitialized())
     {
 	return;
     }
-    this->trailer = obj;
+    this->m->trailer = obj;
 }
 void
 QPDF::reconstruct_xref(QPDFExc& e)
 {
-    if (this->reconstructed_xref)
+    if (this->m->reconstructed_xref)
     {
         // Avoid xref reconstruction infinite loops. This is getting
         // very hard to reproduce because qpdf is throwing many fewer
@@ -367,19 +377,19 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
         throw e;
     }
-    this->reconstructed_xref = true;
+    this->m->reconstructed_xref = true;
-    warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+    warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
 		 "file is damaged"));
     warn(e);
-    warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+    warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
 		 "Attempting to reconstruct cross-reference table"));
     // Delete all references to type 1 (uncompressed) objects
     std::set<QPDFObjGen> to_delete;
     for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
+	     this->m->xref_table.begin();
+	 iter != this->m->xref_table.end(); ++iter)
     {
 	if (((*iter).second).getType() == 1)
 	{
@@ -389,21 +399,22 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
     for (std::set<QPDFObjGen>::iterator iter = to_delete.begin();
 	 iter != to_delete.end(); ++iter)
     {
-	this->xref_table.erase(*iter);
+	this->m->xref_table.erase(*iter);
     }
-    this->file->seek(0, SEEK_END);
-    qpdf_offset_t eof = this->file->tell();
-    this->file->seek(0, SEEK_SET);
+    this->m->file->seek(0, SEEK_END);
+    qpdf_offset_t eof = this->m->file->tell();
+    this->m->file->seek(0, SEEK_SET);
     bool in_obj = false;
     qpdf_offset_t line_start = 0;
-    while (this->file->tell() < eof)
-    {
-        this->file->findAndSkipNextEOL();
-        qpdf_offset_t next_line_start = this->file->tell();
-        this->file->seek(line_start, SEEK_SET);
-        QPDFTokenizer::Token t1 = readToken(this->file, true);
-        qpdf_offset_t token_start = this->file->tell() - t1.getValue().length();
+    while (this->m->file->tell() < eof)
+    {
+        this->m->file->findAndSkipNextEOL();
+        qpdf_offset_t next_line_start = this->m->file->tell();
+        this->m->file->seek(line_start, SEEK_SET);
+        QPDFTokenizer::Token t1 = readToken(this->m->file, true);
+        qpdf_offset_t token_start =
+            this->m->file->tell() - t1.getValue().length();
         if (token_start >= next_line_start)
         {
             // don't process yet
@@ -419,8 +430,8 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
         {
             if (t1.getType() == QPDFTokenizer::tt_integer)
             {
-                QPDFTokenizer::Token t2 = readToken(this->file, true);
-                QPDFTokenizer::Token t3 = readToken(this->file, true);
+                QPDFTokenizer::Token t2 = readToken(this->m->file, true);
+                QPDFTokenizer::Token t3 = readToken(this->m->file, true);
                 if ((t2.getType() == QPDFTokenizer::tt_integer) &&
                     (t3 == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "obj")))
                 {
@@ -430,11 +441,12 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
                     insertXrefEntry(obj, 1, token_start, gen, true);
                 }
             }
-            else if ((! this->trailer.isInitialized()) &&
-                     (t1 == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "trailer")))
+            else if ((! this->m->trailer.isInitialized()) &&
+                     (t1 == QPDFTokenizer::Token(
+                         QPDFTokenizer::tt_word, "trailer")))
             {
                 QPDFObjectHandle t =
-                    readObject(this->file, "trailer", 0, 0, false);
+                    readObject(this->m->file, "trailer", 0, 0, false);
                 if (! t.isDictionary())
                 {
                     // Oh well.  It was worth a try.
@@ -445,11 +457,11 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
                 }
             }
 	}
-        this->file->seek(next_line_start, SEEK_SET);
+        this->m->file->seek(next_line_start, SEEK_SET);
         line_start = next_line_start;
     }
-    if (! this->trailer.isInitialized())
+    if (! this->m->trailer.isInitialized())
     {
 	// We could check the last encountered object to see if it was
 	// an xref stream.  If so, we could try to get the trailer
@@ -457,7 +469,7 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
 	// with bad startxref pointers even when they have object
 	// streams.
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
 		      "unable to find trailer "
 		      "dictionary while recovering damaged file");
     }
@@ -479,8 +491,8 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
     {
         char buf[7];
         memset(buf, 0, sizeof(buf));
-	this->file->seek(xref_offset, SEEK_SET);
-	this->file->read(buf, sizeof(buf) - 1);
+	this->m->file->seek(xref_offset, SEEK_SET);
+	this->m->file->read(buf, sizeof(buf) - 1);
         // The PDF spec says xref must be followed by a line
         // terminator, but files exist in the wild where it is
         // terminated by arbitrary whitespace.
@@ -506,25 +518,25 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
 	}
     }
-    if (! this->trailer.isInitialized())
+    if (! this->m->trailer.isInitialized())
     {
-        throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+        throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
                       "unable to find trailer while reading xref");
     }
-    int size = this->trailer.getKey("/Size").getIntValue();
+    int size = this->m->trailer.getKey("/Size").getIntValue();
     int max_obj = 0;
-    if (! xref_table.empty())
+    if (! this->m->xref_table.empty())
     {
-	max_obj = (*(xref_table.rbegin())).first.getObj();
+	max_obj = (*(this->m->xref_table.rbegin())).first.getObj();
     }
-    if (! this->deleted_objects.empty())
+    if (! this->m->deleted_objects.empty())
     {
-	max_obj = std::max(max_obj, *(this->deleted_objects.rbegin()));
+	max_obj = std::max(max_obj, *(this->m->deleted_objects.rbegin()));
     }
     if (size != max_obj + 1)
     {
 	QTC::TC("qpdf", "QPDF xref size mismatch");
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
 		     std::string("reported number of objects (") +
 		     QUtil::int_to_string(size) +
 		     ") inconsistent with actual number of objects (" +
@@ -533,7 +545,7 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
     // We no longer need the deleted_objects table, so go ahead and
     // clear it out to make sure we never depend on its being set.
-    this->deleted_objects.clear();
+    this->m->deleted_objects.clear();
 }
 bool
@@ -677,9 +689,9 @@ QPDF::parse_xrefEntry(std::string const&amp; line,
     if (invalid)
     {
-        warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+        warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                      "xref table",
-                     this->file->getLastOffset(),
+                     this->m->file->getLastOffset(),
                      "accepting invalid xref table entry"));
     }
@@ -694,13 +706,13 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
 {
     std::vector<QPDFObjGen> deleted_items;
-    this->file->seek(xref_offset, SEEK_SET);
+    this->m->file->seek(xref_offset, SEEK_SET);
     bool done = false;
     while (! done)
     {
         char linebuf[51];
         memset(linebuf, 0, sizeof(linebuf));
-        this->file->read(linebuf, sizeof(linebuf) - 1);
+        this->m->file->read(linebuf, sizeof(linebuf) - 1);
 	std::string line = linebuf;
         int obj = 0;
         int num = 0;
@@ -708,19 +720,19 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
         if (! parse_xrefFirst(line, obj, num, bytes))
 	{
 	    QTC::TC("qpdf", "QPDF invalid xref");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "xref table", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "xref table", this->m->file->getLastOffset(),
 			  "xref syntax invalid");
 	}
-        this->file->seek(this->file->getLastOffset() + bytes, SEEK_SET);
+        this->m->file->seek(this->m->file->getLastOffset() + bytes, SEEK_SET);
 	for (int i = obj; i < obj + num; ++i)
 	{
 	    if (i == 0)
 	    {
 		// This is needed by checkLinearization()
-		this->first_xref_item_offset = this->file->tell();
+		this->m->first_xref_item_offset = this->m->file->tell();
 	    }
-	    std::string xref_entry = this->file->readLine(30);
+	    std::string xref_entry = this->m->file->readLine(30);
             // For xref_table, these will always be small enough to be ints
 	    qpdf_offset_t f1 = 0;
 	    int f2 = 0;
@@ -729,8 +741,8 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
 	    {
 		QTC::TC("qpdf", "QPDF invalid xref entry");
 		throw QPDFExc(
-		    qpdf_e_damaged_pdf, this->file->getName(),
-		    "xref table", this->file->getLastOffset(),
+		    qpdf_e_damaged_pdf, this->m->file->getName(),
+		    "xref table", this->m->file->getLastOffset(),
 		    "invalid xref entry (obj=" +
 		    QUtil::int_to_string(i) + ")");
 	    }
@@ -745,45 +757,45 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
 		insertXrefEntry(i, 1, f1, f2);
 	    }
 	}
-	qpdf_offset_t pos = this->file->tell();
-	QPDFTokenizer::Token t = readToken(this->file);
+	qpdf_offset_t pos = this->m->file->tell();
+	QPDFTokenizer::Token t = readToken(this->m->file);
 	if (t == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "trailer"))
 	{
 	    done = true;
 	}
 	else
 	{
-	    this->file->seek(pos, SEEK_SET);
+	    this->m->file->seek(pos, SEEK_SET);
 	}
     }
     // Set offset to previous xref table if any
     QPDFObjectHandle cur_trailer =
-	readObject(this->file, "trailer", 0, 0, false);
+	readObject(this->m->file, "trailer", 0, 0, false);
     if (! cur_trailer.isDictionary())
     {
 	QTC::TC("qpdf", "QPDF missing trailer");
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      "", this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      "", this->m->file->getLastOffset(),
 		      "expected trailer dictionary");
     }
-    if (! this->trailer.isInitialized())
+    if (! this->m->trailer.isInitialized())
     {
 	setTrailer(cur_trailer);
-	if (! this->trailer.hasKey("/Size"))
+	if (! this->m->trailer.hasKey("/Size"))
 	{
 	    QTC::TC("qpdf", "QPDF trailer lacks size");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "trailer", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "trailer", this->m->file->getLastOffset(),
 			  "trailer dictionary lacks /Size key");
 	}
-	if (! this->trailer.getKey("/Size").isInteger())
+	if (! this->m->trailer.getKey("/Size").isInteger())
 	{
 	    QTC::TC("qpdf", "QPDF trailer size not integer");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "trailer", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "trailer", this->m->file->getLastOffset(),
 			  "/Size key in trailer dictionary is not "
 			  "an integer");
 	}
@@ -791,7 +803,7 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
     if (cur_trailer.hasKey("/XRefStm"))
     {
-	if (this->ignore_xref_streams)
+	if (this->m->ignore_xref_streams)
 	{
 	    QTC::TC("qpdf", "QPDF ignoring XRefStm in trailer");
 	}
@@ -807,7 +819,7 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
 	    }
 	    else
 	    {
-		throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+		throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 			      "xref stream", xref_offset,
 			      "invalid /XRefStm");
 	    }
@@ -827,8 +839,8 @@ QPDF::read_xrefTable(qpdf_offset_t xref_offset)
 	if (! cur_trailer.getKey("/Prev").isInteger())
 	{
 	    QTC::TC("qpdf", "QPDF trailer prev not integer");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "trailer", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "trailer", this->m->file->getLastOffset(),
 			  "/Prev key in trailer dictionary is not "
 			  "an integer");
 	}
@@ -847,7 +859,7 @@ qpdf_offset_t
 QPDF::read_xrefStream(qpdf_offset_t xref_offset)
 {
     bool found = false;
-    if (! this->ignore_xref_streams)
+    if (! this->m->ignore_xref_streams)
     {
 	int xobj;
 	int xgen;
@@ -875,7 +887,7 @@ QPDF::read_xrefStream(qpdf_offset_t xref_offset)
     if (! found)
     {
 	QTC::TC("qpdf", "QPDF can't find xref");
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "", xref_offset, "xref not found");
     }
@@ -896,7 +908,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	   dict.getKey("/Size").isInteger() &&
 	   (Index_obj.isArray() || Index_obj.isNull())))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "xref stream", xref_offset,
 		      "Cross-reference stream does not have"
 		      " proper /W and /Index keys");
@@ -910,7 +922,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	W[i] = W_obj.getArrayItem(i).getIntValue();
         if (W[i] > max_bytes)
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                           "xref stream", xref_offset,
                           "Cross-reference stream's /W contains"
                           " impossibly large values");
@@ -919,7 +931,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
     }
     if (entry_size == 0)
     {
-        throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+        throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                       "xref stream", xref_offset,
                       "Cross-reference stream's /W indicates"
                       " entry size of 0");
@@ -933,7 +945,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	int n_index = Index_obj.getArrayNItems();
 	if ((n_index % 2) || (n_index < 2))
 	{
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 			  "xref stream", xref_offset,
 			  "Cross-reference stream's /Index has an"
 			  " invalid number of values");
@@ -946,7 +958,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	    }
 	    else
 	    {
-		throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+		throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 			      "xref stream", xref_offset,
 			      "Cross-reference stream's /Index's item " +
 			      QUtil::int_to_string(i) +
@@ -969,7 +981,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
     {
         if (indx.at(i) > max_num_entries - num_entries)
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                           "xref stream", xref_offset,
                           "Cross-reference stream claims to contain"
                           " too many entries: " +
@@ -989,7 +1001,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
     if (expected_size != actual_size)
     {
-	QPDFExc x(qpdf_e_damaged_pdf, this->file->getName(),
+	QPDFExc x(qpdf_e_damaged_pdf, this->m->file->getName(),
 		  "xref stream", xref_offset,
 		  "Cross-reference stream data has the wrong size;"
 		  " expected = " + QUtil::int_to_string(expected_size) +
@@ -1050,7 +1062,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	{
 	    if (fields[0] != 2)
 	    {
-		this->uncompressed_after_compressed = true;
+		this->m->uncompressed_after_compressed = true;
 	    }
 	}
 	else if (fields[0] == 2)
@@ -1060,13 +1072,13 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
 	if (obj == 0)
 	{
 	    // This is needed by checkLinearization()
-	    this->first_xref_item_offset = xref_offset;
+	    this->m->first_xref_item_offset = xref_offset;
 	}
 	insertXrefEntry(obj, static_cast<int>(fields[0]),
                         fields[1], static_cast<int>(fields[2]));
     }
-    if (! this->trailer.isInitialized())
+    if (! this->m->trailer.isInitialized())
     {
 	setTrailer(dict);
     }
@@ -1075,8 +1087,8 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle&amp; xref_obj)
     {
 	if (! dict.getKey("/Prev").isInteger())
 	{
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "xref stream", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "xref stream", this->m->file->getLastOffset(),
 			  "/Prev key in xref stream dictionary is not "
 			  "an integer");
 	}
@@ -1108,12 +1120,12 @@ QPDF::insertXrefEntry(int obj, int f0, qpdf_offset_t f1, int f2, bool overwrite)
     { // private scope
 	int gen = (f0 == 2 ? 0 : f2);
 	QPDFObjGen og(obj, gen);
-	if (this->xref_table.count(og))
+	if (this->m->xref_table.count(og))
 	{
 	    if (overwrite)
 	    {
 		QTC::TC("qpdf", "QPDF xref overwrite object");
-		this->xref_table.erase(og);
+		this->m->xref_table.erase(og);
 	    }
 	    else
 	    {
@@ -1121,7 +1133,7 @@ QPDF::insertXrefEntry(int obj, int f0, qpdf_offset_t f1, int f2, bool overwrite)
 		return;
 	    }
 	}
-	if (this->deleted_objects.count(obj))
+	if (this->m->deleted_objects.count(obj))
 	{
 	    QTC::TC("qpdf", "QPDF xref deleted object");
 	    return;
@@ -1131,22 +1143,22 @@ QPDF::insertXrefEntry(int obj, int f0, qpdf_offset_t f1, int f2, bool overwrite)
     switch (f0)
     {
       case 0:
-	this->deleted_objects.insert(obj);
+	this->m->deleted_objects.insert(obj);
 	break;
       case 1:
 	// f2 is generation
 	QTC::TC("qpdf", "QPDF xref gen > 0", ((f2 > 0) ? 1 : 0));
-	this->xref_table[QPDFObjGen(obj, f2)] = QPDFXRefEntry(f0, f1, f2);
+	this->m->xref_table[QPDFObjGen(obj, f2)] = QPDFXRefEntry(f0, f1, f2);
 	break;
       case 2:
-	this->xref_table[QPDFObjGen(obj, 0)] = QPDFXRefEntry(f0, f1, f2);
+	this->m->xref_table[QPDFObjGen(obj, 0)] = QPDFXRefEntry(f0, f1, f2);
 	break;
       default:
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      "xref stream", this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      "xref stream", this->m->file->getLastOffset(),
 		      "unknown xref stream entry type " +
 		      QUtil::int_to_string(f0));
 	break;
@@ -1157,21 +1169,24 @@ void
 QPDF::showXRefTable()
 {
     for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
+	     this->m->xref_table.begin();
+	 iter != this->m->xref_table.end(); ++iter)
     {
 	QPDFObjGen const& og = (*iter).first;
 	QPDFXRefEntry const& entry = (*iter).second;
-	*out_stream << og.getObj() << "/" << og.getGen() << ": ";
+	*this->m->out_stream << og.getObj() << "/" << og.getGen() << ": ";
 	switch (entry.getType())
 	{
 	  case 1:
-	    *out_stream << "uncompressed; offset = " << entry.getOffset();
+	    *this->m->out_stream
+                << "uncompressed; offset = " << entry.getOffset();
 	    break;
 	  case 2:
-	    *out_stream << "compressed; stream = " << entry.getObjStreamNumber()
-			<< ", index = " << entry.getObjStreamIndex();
+	    *this->m->out_stream
+                << "compressed; stream = "
+                << entry.getObjStreamNumber()
+                << ", index = " << entry.getObjStreamIndex();
 	    break;
 	  default:
@@ -1179,7 +1194,7 @@ QPDF::showXRefTable()
 				   " showing xref_table");
 	    break;
 	}
-	*out_stream << std::endl;
+	*this->m->out_stream << std::endl;
     }
 }
@@ -1188,8 +1203,8 @@ QPDF::getAllObjects()
 {
     std::vector<QPDFObjectHandle> result;
     for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
+	     this->m->xref_table.begin();
+	 iter != this->m->xref_table.end(); ++iter)
     {
 	QPDFObjGen const& og = (*iter).first;
@@ -1203,18 +1218,18 @@ void
 QPDF::setLastObjectDescription(std::string const& description,
 			       int objid, int generation)
 {
-    this->last_object_description.clear();
+    this->m->last_object_description.clear();
     if (! description.empty())
     {
-	this->last_object_description += description;
+	this->m->last_object_description += description;
 	if (objid > 0)
 	{
-	    this->last_object_description += ": ";
+	    this->m->last_object_description += ": ";
 	}
     }
     if (objid > 0)
     {
-	this->last_object_description += "object " +
+	this->m->last_object_description += "object " +
 	    QUtil::int_to_string(objid) + " " +
 	    QUtil::int_to_string(generation);
     }
@@ -1231,20 +1246,20 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
     bool empty = false;
     PointerHolder<StringDecrypter> decrypter_ph;
     StringDecrypter* decrypter = 0;
-    if (this->encrypted && (! in_object_stream))
+    if (this->m->encrypted && (! in_object_stream))
     {
         decrypter_ph = new StringDecrypter(this, objid, generation);
         decrypter = decrypter_ph.getPointer();
     }
     QPDFObjectHandle object = QPDFObjectHandle::parse(
-        input, description, this->tokenizer, empty, decrypter, this);
+        input, description, this->m->tokenizer, empty, decrypter, this);
     if (empty)
     {
         // Nothing in the PDF spec appears to allow empty objects, but
         // they have been encountered in actual PDF files and Adobe
         // Reader appears to ignore them.
         warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                     this->last_object_description,
+                     this->m->last_object_description,
                      input->getLastOffset(),
                      "empty object treated as null"));
     }
@@ -1299,7 +1314,7 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
                             warn(QPDFExc(
                                      qpdf_e_damaged_pdf,
                                      input->getName(),
-                                     this->last_object_description,
+                                     this->m->last_object_description,
                                      input->tell(),
                                      "stream keyword followed"
                                      " by carriage return only"));
@@ -1315,7 +1330,7 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
                         input->unreadCh(ch);
                     }
                     warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                                 this->last_object_description,
+                                 this->m->last_object_description,
                                  input->tell(),
                                  "stream keyword not followed"
                                  " by proper line terminator"));
@@ -1337,7 +1352,7 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
                 {
                     QTC::TC("qpdf", "QPDF stream without length");
                     throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                                  this->last_object_description, offset,
+                                  this->m->last_object_description, offset,
                                   "stream dictionary lacks /Length key");
                 }
@@ -1346,7 +1361,7 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
                 {
                     QTC::TC("qpdf", "QPDF stream length not integer");
                     throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                                  this->last_object_description, offset,
+                                  this->m->last_object_description, offset,
                                   "/Length key in stream dictionary is not "
                                   "an integer");
                 }
@@ -1359,14 +1374,14 @@ QPDF::readObject(PointerHolder&lt;InputSource&gt; input,
                 {
                     QTC::TC("qpdf", "QPDF missing endstream");
                     throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                                  this->last_object_description,
+                                  this->m->last_object_description,
                                   input->getLastOffset(),
                                   "expected endstream");
                 }
             }
             catch (QPDFExc& e)
             {
-                if (this->attempt_recovery)
+                if (this->m->attempt_recovery)
                 {
                     warn(e);
                     length = recoverStreamLength(
@@ -1396,12 +1411,12 @@ bool
 QPDF::findEndstream()
 {
     // Find endstream or endobj. Position the input at that token.
-    QPDFTokenizer::Token t = readToken(this->file, true);
+    QPDFTokenizer::Token t = readToken(this->m->file, true);
     if ((t.getType() == QPDFTokenizer::tt_word) &&
         ((t.getValue() == "endobj") ||
          (t.getValue() == "endstream")));
     {
-        this->file->seek(this->file->getLastOffset(), SEEK_SET);
+        this->m->file->seek(this->m->file->getLastOffset(), SEEK_SET);
         return true;
     }
     return false;
@@ -1415,19 +1430,19 @@ QPDF::recoverStreamLength(PointerHolder&lt;InputSource&gt; input,
     // Try to reconstruct stream length by looking for
     // endstream or endobj
     warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-		 this->last_object_description, stream_offset,
+		 this->m->last_object_description, stream_offset,
 		 "attempting to recover stream length"));
     PatternFinder ef(*this, &QPDF::findEndstream);
     size_t length = 0;
-    if (this->file->findFirst("end", stream_offset, 0, ef))
+    if (this->m->file->findFirst("end", stream_offset, 0, ef))
     {
-        length = this->file->tell() - stream_offset;
+        length = this->m->file->tell() - stream_offset;
         // Reread endstream but, if it was endobj, don't skip that.
-        QPDFTokenizer::Token t = readToken(this->file);
+        QPDFTokenizer::Token t = readToken(this->m->file);
         if (t.getValue() == "endobj")
         {
-            this->file->seek(this->file->getLastOffset(), SEEK_SET);
+            this->m->file->seek(this->m->file->getLastOffset(), SEEK_SET);
         }
     }
@@ -1438,8 +1453,8 @@ QPDF::recoverStreamLength(PointerHolder&lt;InputSource&gt; input,
 	// Make sure this is inside this object
 	for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
-		 this->xref_table.begin();
-	     iter != this->xref_table.end(); ++iter)
+		 this->m->xref_table.begin();
+	     iter != this->m->xref_table.end(); ++iter)
 	{
 	    QPDFObjGen const& og = (*iter).first;
 	    QPDFXRefEntry const& entry = (*iter).second;
@@ -1472,13 +1487,14 @@ QPDF::recoverStreamLength(PointerHolder&lt;InputSource&gt; input,
     if (length == 0)
     {
         warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                     this->last_object_description, stream_offset,
-                     "unable to recover stream data; treating stream as empty"));
+                     this->m->last_object_description, stream_offset,
+                     "unable to recover stream data;"
+                     " treating stream as empty"));
     }
     else
     {
         warn(QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-                     this->last_object_description, stream_offset,
+                     this->m->last_object_description, stream_offset,
                      "recovered stream length: " +
                      QUtil::int_to_string(length)));
     }
@@ -1490,8 +1506,8 @@ QPDF::recoverStreamLength(PointerHolder&lt;InputSource&gt; input,
 QPDFTokenizer::Token
 QPDF::readToken(PointerHolder<InputSource> input, bool allow_bad)
 {
-    return this->tokenizer.readToken(
-        input, this->last_object_description, allow_bad);
+    return this->m->tokenizer.readToken(
+        input, this->m->last_object_description, allow_bad);
 }
 QPDFObjectHandle
@@ -1500,7 +1516,7 @@ QPDF::readObjectAtOffset(bool try_recovery,
 			 int exp_objid, int exp_generation,
 			 int& objid, int& generation)
 {
-    if (! this->attempt_recovery)
+    if (! this->m->attempt_recovery)
     {
         try_recovery = false;
     }
@@ -1514,17 +1530,17 @@ QPDF::readObjectAtOffset(bool try_recovery,
     if (offset == 0)
     {
         QTC::TC("qpdf", "QPDF bogus 0 offset", 0);
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		     this->last_object_description, 0,
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		     this->m->last_object_description, 0,
 		     "object has offset 0"));
         return QPDFObjectHandle::newNull();
     }
-    this->file->seek(offset, SEEK_SET);
+    this->m->file->seek(offset, SEEK_SET);
-    QPDFTokenizer::Token tobjid = readToken(this->file);
-    QPDFTokenizer::Token tgen = readToken(this->file);
-    QPDFTokenizer::Token tobj = readToken(this->file);
+    QPDFTokenizer::Token tobjid = readToken(this->m->file);
+    QPDFTokenizer::Token tgen = readToken(this->m->file);
+    QPDFTokenizer::Token tobj = readToken(this->m->file);
     bool objidok = (tobjid.getType() == QPDFTokenizer::tt_integer);
     int genok = (tgen.getType() == QPDFTokenizer::tt_integer);
@@ -1539,8 +1555,8 @@ QPDF::readObjectAtOffset(bool try_recovery,
 	if (! (objidok && genok && objok))
 	{
 	    QTC::TC("qpdf", "QPDF expected n n obj");
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  this->last_object_description, offset,
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  this->m->last_object_description, offset,
 			  "expected n n obj");
 	}
 	objid = atoi(tobjid.getValue().c_str());
@@ -1549,8 +1565,8 @@ QPDF::readObjectAtOffset(bool try_recovery,
         if (objid == 0)
         {
             QTC::TC("qpdf", "QPDF object id 0");
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                          this->last_object_description, offset,
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                          this->m->last_object_description, offset,
                           "object with ID 0");
         }
@@ -1558,8 +1574,8 @@ QPDF::readObjectAtOffset(bool try_recovery,
 	    (! ((objid == exp_objid) && (generation == exp_generation))))
 	{
 	    QTC::TC("qpdf", "QPDF err wrong objid/generation");
-	    QPDFExc e(qpdf_e_damaged_pdf, this->file->getName(),
-                      this->last_object_description, offset,
+	    QPDFExc e(qpdf_e_damaged_pdf, this->m->file->getName(),
+                      this->m->last_object_description, offset,
                       std::string("expected ") +
                       QUtil::int_to_string(exp_objid) + " " +
                       QUtil::int_to_string(exp_generation) + " obj");
@@ -1583,10 +1599,10 @@ QPDF::readObjectAtOffset(bool try_recovery,
 	    // Try again after reconstructing xref table
 	    reconstruct_xref(e);
 	    QPDFObjGen og(exp_objid, exp_generation);
-	    if (this->xref_table.count(og) &&
-		(this->xref_table[og].getType() == 1))
+	    if (this->m->xref_table.count(og) &&
+		(this->m->xref_table[og].getType() == 1))
 	    {
-		qpdf_offset_t new_offset = this->xref_table[og].getOffset();
+		qpdf_offset_t new_offset = this->m->xref_table[og].getOffset();
 		QPDFObjectHandle result = readObjectAtOffset(
 		    false, new_offset, description,
 		    exp_objid, exp_generation, objid, generation);
@@ -1597,7 +1613,7 @@ QPDF::readObjectAtOffset(bool try_recovery,
 	    {
 		QTC::TC("qpdf", "QPDF object gone after xref reconstruction");
 		warn(QPDFExc(
-			 qpdf_e_damaged_pdf, this->file->getName(),
+			 qpdf_e_damaged_pdf, this->m->file->getName(),
 			 "", 0,
 			 std::string(
 			     "object " +
@@ -1616,19 +1632,20 @@ QPDF::readObjectAtOffset(bool try_recovery,
     }
     QPDFObjectHandle oh = readObject(
-	this->file, description, objid, generation, false);
+	this->m->file, description, objid, generation, false);
-    if (! (readToken(this->file) ==
+    if (! (readToken(this->m->file) ==
 	   QPDFTokenizer::Token(QPDFTokenizer::tt_word, "endobj")))
     {
 	QTC::TC("qpdf", "QPDF err expected endobj");
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		     this->last_object_description, this->file->getLastOffset(),
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		     this->m->last_object_description,
+                     this->m->file->getLastOffset(),
 		     "expected endobj"));
     }
     QPDFObjGen og(objid, generation);
-    if (! this->obj_cache.count(og))
+    if (! this->m->obj_cache.count(og))
     {
 	// Store the object in the cache here so it gets cached
 	// whether we first know the offset or whether we first know
@@ -1640,30 +1657,30 @@ QPDF::readObjectAtOffset(bool try_recovery,
 	// linearization hint tables.  Offsets and lengths of objects
 	// may imply the end of an object to be anywhere between these
 	// values.
-	qpdf_offset_t end_before_space = this->file->tell();
+	qpdf_offset_t end_before_space = this->m->file->tell();
 	// skip over spaces
 	while (true)
 	{
 	    char ch;
-	    if (this->file->read(&ch, 1))
+	    if (this->m->file->read(&ch, 1))
 	    {
 		if (! isspace(static_cast<unsigned char>(ch)))
 		{
-		    this->file->seek(-1, SEEK_CUR);
+		    this->m->file->seek(-1, SEEK_CUR);
 		    break;
 		}
 	    }
 	    else
 	    {
-		throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			      this->last_object_description, offset,
+		throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			      this->m->last_object_description, offset,
 			      "EOF after endobj");
 	    }
 	}
-	qpdf_offset_t end_after_space = this->file->tell();
+	qpdf_offset_t end_after_space = this->m->file->tell();
-	this->obj_cache[og] =
+	this->m->obj_cache[og] =
 	    ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh),
 		     end_before_space, end_after_space);
     }
@@ -1678,14 +1695,14 @@ QPDF::resolve(int objid, int generation)
     // to insert things into the object cache that don't actually
     // exist in the file.
     QPDFObjGen og(objid, generation);
-    if (this->resolving.count(og))
+    if (this->m->resolving.count(og))
     {
         // This can happen if an object references itself directly or
         // indirectly in some key that has to be resolved during
         // object parsing, such as stream length.
 	QTC::TC("qpdf", "QPDF recursion loop in resolve");
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		     "", this->file->getLastOffset(),
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		     "", this->m->file->getLastOffset(),
 		     "loop detected resolving object " +
 		     QUtil::int_to_string(objid) + " " +
 		     QUtil::int_to_string(generation)));
@@ -1693,15 +1710,15 @@ QPDF::resolve(int objid, int generation)
     }
     ResolveRecorder rr(this, og);
-    if (! this->obj_cache.count(og))
+    if (! this->m->obj_cache.count(og))
     {
-	if (! this->xref_table.count(og))
+	if (! this->m->xref_table.count(og))
 	{
 	    // PDF spec says unknown objects resolve to the null object.
 	    return new QPDF_Null;
 	}
-	QPDFXRefEntry const& entry = this->xref_table[og];
+	QPDFXRefEntry const& entry = this->m->xref_table[og];
         bool success = false;
         try
         {
@@ -1724,7 +1741,8 @@ QPDF::resolve(int objid, int generation)
                 break;
               default:
-                throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+                throw QPDFExc(qpdf_e_damaged_pdf,
+                              this->m->file->getName(), "", 0,
                               "object " +
                               QUtil::int_to_string(objid) + "/" +
                               QUtil::int_to_string(generation) +
@@ -1738,7 +1756,7 @@ QPDF::resolve(int objid, int generation)
         }
         catch (std::exception& e)
         {
-            warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(), "", 0,
+            warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
                          "object " +
                          QUtil::int_to_string(objid) + "/" +
                          QUtil::int_to_string(generation) +
@@ -1748,12 +1766,12 @@ QPDF::resolve(int objid, int generation)
         {
             QTC::TC("qpdf", "QPDF resolve failure to null");
             QPDFObjectHandle oh = QPDFObjectHandle::newNull();
-            this->obj_cache[og] =
+            this->m->obj_cache[og] =
                 ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh), -1, -1);
         }
     }
-    return this->obj_cache[og].object;
+    return this->m->obj_cache[og].object;
 }
 void
@@ -1763,9 +1781,9 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
     QPDFObjectHandle obj_stream = getObjectByID(obj_stream_number, 0);
     if (! obj_stream.isStream())
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "supposed object stream " +
 		      QUtil::int_to_string(obj_stream_number) +
 		      " is not a stream");
@@ -1775,18 +1793,18 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
     // object stream for the objects in the stream.
     QPDFObjGen stream_og(obj_stream_number, 0);
     qpdf_offset_t end_before_space =
-        this->obj_cache[stream_og].end_before_space;
+        this->m->obj_cache[stream_og].end_before_space;
     qpdf_offset_t end_after_space =
-        this->obj_cache[stream_og].end_after_space;
+        this->m->obj_cache[stream_og].end_after_space;
     QPDFObjectHandle dict = obj_stream.getDict();
     if (! (dict.getKey("/Type").isName() &&
 	   dict.getKey("/Type").getName() == "/ObjStm"))
     {
 	QTC::TC("qpdf", "QPDF ERR object stream with wrong type");
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "supposed object stream " +
 		      QUtil::int_to_string(obj_stream_number) +
 		      " has wrong type");
@@ -1795,9 +1813,9 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
     if (! (dict.getKey("/N").isInteger() &&
 	   dict.getKey("/First").isInteger()))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "object stream " +
 		      QUtil::int_to_string(obj_stream_number) +
 		      " has incorrect keys");
@@ -1821,7 +1839,8 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
 	       (toffset.getType() == QPDFTokenizer::tt_integer)))
 	{
 	    throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
-			  this->last_object_description, input->getLastOffset(),
+			  this->m->last_object_description,
+                          input->getLastOffset(),
 			  "expected integer in object stream header");
 	}
@@ -1840,14 +1859,14 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
     {
 	int obj = (*iter).first;
 	QPDFObjGen og(obj, 0);
-        QPDFXRefEntry const& entry = this->xref_table[og];
+        QPDFXRefEntry const& entry = this->m->xref_table[og];
         if ((entry.getType() == 2) &&
             (entry.getObjStreamNumber() == obj_stream_number))
         {
             int offset = (*iter).second;
             input->seek(offset, SEEK_SET);
             QPDFObjectHandle oh = readObject(input, "", obj, 0, true);
-            this->obj_cache[og] =
+            this->m->obj_cache[og] =
                 ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh),
                          end_before_space, end_after_space);
         }
@@ -1862,16 +1881,16 @@ QPDFObjectHandle
 QPDF::makeIndirectObject(QPDFObjectHandle oh)
 {
     QPDFObjGen o1(0, 0);
-    if (! this->obj_cache.empty())
+    if (! this->m->obj_cache.empty())
     {
-	o1 = (*(this->obj_cache.rbegin())).first;
+	o1 = (*(this->m->obj_cache.rbegin())).first;
     }
-    QPDFObjGen o2 = (*(this->xref_table.rbegin())).first;
+    QPDFObjGen o2 = (*(this->m->xref_table.rbegin())).first;
     QTC::TC("qpdf", "QPDF indirect last obj from xref",
 	    (o2.getObj() > o1.getObj()) ? 1 : 0);
     int max_objid = std::max(o1.getObj(), o2.getObj());
     QPDFObjGen next(max_objid + 1, 0);
-    this->obj_cache[next] =
+    this->m->obj_cache[next] =
 	ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh), -1, -1);
     return QPDFObjectHandle::Factory::newIndirect(
         this, next.getObj(), next.getGen());
@@ -1910,7 +1929,7 @@ QPDF::replaceObject(int objid, int generation, QPDFObjectHandle oh)
     // Replace the object in the object cache
     QPDFObjGen og(objid, generation);
-    this->obj_cache[og] =
+    this->m->obj_cache[og] =
 	ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh), -1, -1);
 }
@@ -1946,7 +1965,7 @@ QPDF::copyForeignObject(QPDFObjectHandle foreign, bool allow_page)
             "QPDF::copyForeign called with object from this QPDF");
     }
-    ObjCopier& obj_copier = this->object_copiers[other];
+    ObjCopier& obj_copier = this->m->object_copiers[other];
     if (! obj_copier.visiting.empty())
     {
         throw std::logic_error("obj_copier.visiting is not empty"
@@ -2016,7 +2035,8 @@ QPDF::reserveObjects(QPDFObjectHandle foreign, ObjCopier&amp; obj_copier,
             QTC::TC("qpdf", "QPDF loop reserving objects");
             return;
         }
-        if (obj_copier.object_map.find(foreign_og) != obj_copier.object_map.end())
+        if (obj_copier.object_map.find(foreign_og) !=
+            obj_copier.object_map.end())
         {
             QTC::TC("qpdf", "QPDF already reserved object");
             return;
@@ -2139,15 +2159,16 @@ QPDF::replaceForeignIndirectObjects(
                 replaceForeignIndirectObjects(
                     old_dict.getKey(*iter), obj_copier, false));
 	}
-        if (this->copied_stream_data_provider == 0)
+        if (this->m->copied_stream_data_provider == 0)
         {
-            this->copied_stream_data_provider = new CopiedStreamDataProvider();
-            this->copied_streams = this->copied_stream_data_provider;
+            this->m->copied_stream_data_provider =
+                new CopiedStreamDataProvider();
+            this->m->copied_streams = this->m->copied_stream_data_provider;
         }
         QPDFObjGen local_og(result.getObjGen());
-        this->copied_stream_data_provider->registerForeignStream(
+        this->m->copied_stream_data_provider->registerForeignStream(
             local_og, foreign);
-        result.replaceStreamData(this->copied_streams,
+        result.replaceStreamData(this->m->copied_streams,
                                  dict.getKey("/Filter"),
                                  dict.getKey("/DecodeParms"));
     }
@@ -2181,21 +2202,21 @@ QPDF::swapObjects(int objid1, int generation1, int objid2, int generation2)
     resolve(objid2, generation2);
     QPDFObjGen og1(objid1, generation1);
     QPDFObjGen og2(objid2, generation2);
-    ObjCache t = this->obj_cache[og1];
-    this->obj_cache[og1] = this->obj_cache[og2];
-    this->obj_cache[og2] = t;
+    ObjCache t = this->m->obj_cache[og1];
+    this->m->obj_cache[og1] = this->m->obj_cache[og2];
+    this->m->obj_cache[og2] = t;
 }
 std::string
 QPDF::getFilename() const
 {
-    return this->file->getName();
+    return this->m->file->getName();
 }
 std::string
 QPDF::getPDFVersion() const
 {
-    return this->pdf_version;
+    return this->m->pdf_version;
 }
 int
@@ -2225,17 +2246,17 @@ QPDF::getExtensionLevel()
 QPDFObjectHandle
 QPDF::getTrailer()
 {
-    return this->trailer;
+    return this->m->trailer;
 }
 QPDFObjectHandle
 QPDF::getRoot()
 {
-    QPDFObjectHandle root = this->trailer.getKey("/Root");
+    QPDFObjectHandle root = this->m->trailer.getKey("/Root");
     if (! root.isDictionary())
     {
-        throw QPDFExc(qpdf_e_damaged_pdf, file->getName(),
-                      "", file->getLastOffset(),
+        throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                      "", this->m->file->getLastOffset(),
                       "unable to find /Root dictionary");
     }
     return root;
@@ -2245,8 +2266,8 @@ void
 QPDF::getObjectStreamData(std::map<int, int>& omap)
 {
     for (std::map<QPDFObjGen, QPDFXRefEntry>::iterator iter =
-	     this->xref_table.begin();
-	 iter != this->xref_table.end(); ++iter)
+	     this->m->xref_table.begin();
+	 iter != this->m->xref_table.end(); ++iter)
     {
 	QPDFObjGen const& og = (*iter).first;
 	QPDFXRefEntry const& entry = (*iter).second;
@@ -2270,12 +2291,13 @@ QPDF::getCompressibleObjGens()
     // orphaned items.
     // Exclude encryption dictionary, if any
-    QPDFObjectHandle encryption_dict = trailer.getKey("/Encrypt");
+    QPDFObjectHandle encryption_dict =
+        this->m->trailer.getKey("/Encrypt");
     QPDFObjGen encryption_dict_og = encryption_dict.getObjGen();
     std::set<QPDFObjGen> visited;
     std::list<QPDFObjectHandle> queue;
-    queue.push_front(this->trailer);
+    queue.push_front(this->m->trailer);
     std::vector<QPDFObjGen> result;
     while (! queue.empty())
     {
@@ -2353,25 +2375,25 @@ QPDF::pipeStreamData(int objid, int generation,
 {
     bool success = false;
     std::vector<PointerHolder<Pipeline> > to_delete;
-    if (this->encrypted)
+    if (this->m->encrypted)
     {
 	decryptStream(pipeline, objid, generation, stream_dict, to_delete);
     }
     try
     {
-	this->file->seek(offset, SEEK_SET);
+	this->m->file->seek(offset, SEEK_SET);
 	char buf[10240];
 	while (length > 0)
 	{
 	    size_t to_read = (sizeof(buf) < length ? sizeof(buf) : length);
-	    size_t len = this->file->read(buf, to_read);
+	    size_t len = this->m->file->read(buf, to_read);
 	    if (len == 0)
 	    {
 		throw QPDFExc(qpdf_e_damaged_pdf,
-			      this->file->getName(),
-			      this->last_object_description,
-			      this->file->getLastOffset(),
+			      this->m->file->getName(),
+			      this->m->last_object_description,
+			      this->m->file->getLastOffset(),
 			      "unexpected EOF reading stream data");
 	    }
 	    length -= len;
@@ -2392,8 +2414,8 @@ QPDF::pipeStreamData(int objid, int generation,
         if (! suppress_warnings)
         {
             QTC::TC("qpdf", "QPDF decoding error warning");
-            warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                         "", this->file->getLastOffset(),
+            warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                         "", this->m->file->getLastOffset(),
                          "error decoding stream data for object " +
                          QUtil::int_to_string(objid) + " " +
                          QUtil::int_to_string(generation) + ": " + e.what()));
@@ -2442,7 +2464,7 @@ QPDF::findAttachmentStreams()
             item.getKey("/EF").getKey("/F").isStream())
         {
             QPDFObjectHandle stream = item.getKey("/EF").getKey("/F");
-            this->attachment_streams.insert(stream.getObjGen());
+            this->m->attachment_streams.insert(stream.getObjGen());
         }
     }
 }
@@ -760,9 +760,9 @@ QPDF::interpretCF(QPDFObjectHandle cf)
     if (cf.isName())
     {
 	std::string filter = cf.getName();
-	if (this->crypt_filters.count(filter) != 0)
+	if (this->m->crypt_filters.count(filter) != 0)
 	{
-	    return this->crypt_filters[filter];
+	    return this->m->crypt_filters[filter];
 	}
 	else if (filter == "/Identity")
 	{
@@ -783,29 +783,29 @@ QPDF::interpretCF(QPDFObjectHandle cf)
 void
 QPDF::initializeEncryption()
 {
-    if (this->encryption_initialized)
+    if (this->m->encryption_initialized)
     {
 	return;
     }
-    this->encryption_initialized = true;
+    this->m->encryption_initialized = true;
     // After we initialize encryption parameters, we must used stored
     // key information and never look at /Encrypt again.  Otherwise,
     // things could go wrong if someone mutates the encryption
     // dictionary.
-    if (! this->trailer.hasKey("/Encrypt"))
+    if (! this->m->trailer.hasKey("/Encrypt"))
     {
 	return;
     }
-    // Go ahead and set this->encryption here.  That way, isEncrypted
+    // Go ahead and set this->m->encrypted here.  That way, isEncrypted
     // will return true even if there were errors reading the
     // encryption dictionary.
-    this->encrypted = true;
+    this->m->encrypted = true;
     std::string id1;
-    QPDFObjectHandle id_obj = this->trailer.getKey("/ID");
+    QPDFObjectHandle id_obj = this->m->trailer.getKey("/ID");
     if ((id_obj.isArray() &&
          (id_obj.getArrayNItems() == 2) &&
          id_obj.getArrayItem(0).isString()))
@@ -817,31 +817,31 @@ QPDF::initializeEncryption()
         // Treating a missing ID as the empty string enables qpdf to
         // decrypt some invalid encrypted files with no /ID that
         // poppler can read but Adobe Reader can't.
-	warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                     "trailer", this->file->getLastOffset(),
+	warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                     "trailer", this->m->file->getLastOffset(),
                      "invalid /ID in trailer dictionary"));
     }
-    QPDFObjectHandle encryption_dict = this->trailer.getKey("/Encrypt");
+    QPDFObjectHandle encryption_dict = this->m->trailer.getKey("/Encrypt");
     if (! encryption_dict.isDictionary())
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "/Encrypt in trailer dictionary is not a dictionary");
     }
     if (! (encryption_dict.getKey("/Filter").isName() &&
 	   (encryption_dict.getKey("/Filter").getName() == "/Standard")))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      "encryption dictionary", this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      "encryption dictionary", this->m->file->getLastOffset(),
 		      "unsupported encryption filter");
     }
     if (! encryption_dict.getKey("/SubFilter").isNull())
     {
-	warn(QPDFExc(qpdf_e_unsupported, this->file->getName(),
-		     "encryption dictionary", this->file->getLastOffset(),
+	warn(QPDFExc(qpdf_e_unsupported, this->m->file->getName(),
+		     "encryption dictionary", this->m->file->getLastOffset(),
 		     "file uses encryption SubFilters,"
 		     " which qpdf does not support"));
     }
@@ -852,8 +852,8 @@ QPDF::initializeEncryption()
 	   encryption_dict.getKey("/U").isString() &&
 	   encryption_dict.getKey("/P").isInteger()))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      "encryption dictionary", this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      "encryption dictionary", this->m->file->getLastOffset(),
 		      "some encryption dictionary parameters are missing "
 		      "or the wrong type");
     }
@@ -869,15 +869,15 @@ QPDF::initializeEncryption()
     if (! (((R >= 2) && (R <= 6)) &&
 	   ((V == 1) || (V == 2) || (V == 4) || (V == 5))))
     {
-	throw QPDFExc(qpdf_e_unsupported, this->file->getName(),
-		      "encryption dictionary", this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_unsupported, this->m->file->getName(),
+		      "encryption dictionary", this->m->file->getLastOffset(),
 		      "Unsupported /R or /V in encryption dictionary; R = " +
                       QUtil::int_to_string(R) + " (max 6), V = " +
                       QUtil::int_to_string(V) + " (max 5)");
     }
-    this->encryption_V = V;
-    this->encryption_R = R;
+    this->m->encryption_V = V;
+    this->m->encryption_R = R;
     // OE, UE, and Perms are only present if V >= 5.
     std::string OE;
@@ -890,8 +890,9 @@ QPDF::initializeEncryption()
         pad_short_parameter(U, key_bytes);
         if (! ((O.length() == key_bytes) && (U.length() == key_bytes)))
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                          "encryption dictionary", this->file->getLastOffset(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                          "encryption dictionary",
+                          this->m->file->getLastOffset(),
                           "incorrect length for /O and/or /U in "
                           "encryption dictionary");
         }
@@ -902,8 +903,9 @@ QPDF::initializeEncryption()
                encryption_dict.getKey("/UE").isString() &&
                encryption_dict.getKey("/Perms").isString()))
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                          "encryption dictionary", this->file->getLastOffset(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                          "encryption dictionary",
+                          this->m->file->getLastOffset(),
                           "some V=5 encryption dictionary parameters are "
                           "missing or the wrong type");
         }
@@ -922,8 +924,9 @@ QPDF::initializeEncryption()
             (UE.length() < OUE_key_bytes_V5) ||
             (Perms.length() < Perms_key_bytes_V5))
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                          "encryption dictionary", this->file->getLastOffset(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                          "encryption dictionary",
+                          this->m->file->getLastOffset(),
                           "incorrect length for some of"
                           " /O, /U, /OE, /UE, or /Perms in"
                           " encryption dictionary");
@@ -936,16 +939,17 @@ QPDF::initializeEncryption()
 	Length = encryption_dict.getKey("/Length").getIntValue();
 	if ((Length % 8) || (Length < 40) || (Length > 256))
 	{
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			  "encryption dictionary", this->file->getLastOffset(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			  "encryption dictionary",
+                          this->m->file->getLastOffset(),
 			  "invalid /Length value in encryption dictionary");
 	}
     }
-    this->encrypt_metadata = true;
+    this->m->encrypt_metadata = true;
     if ((V >= 4) && (encryption_dict.getKey("/EncryptMetadata").isBool()))
     {
-	this->encrypt_metadata =
+	this->m->encrypt_metadata =
 	    encryption_dict.getKey("/EncryptMetadata").getBoolValue();
     }
@@ -986,40 +990,40 @@ QPDF::initializeEncryption()
 			method = e_unknown;
 		    }
 		}
-		this->crypt_filters[filter] = method;
+		this->m->crypt_filters[filter] = method;
 	    }
 	}
 	QPDFObjectHandle StmF = encryption_dict.getKey("/StmF");
 	QPDFObjectHandle StrF = encryption_dict.getKey("/StrF");
 	QPDFObjectHandle EFF = encryption_dict.getKey("/EFF");
-	this->cf_stream = interpretCF(StmF);
-	this->cf_string = interpretCF(StrF);
+	this->m->cf_stream = interpretCF(StmF);
+	this->m->cf_string = interpretCF(StrF);
 	if (EFF.isName())
 	{
-	    this->cf_file = interpretCF(EFF);
+	    this->m->cf_file = interpretCF(EFF);
 	}
 	else
 	{
-	    this->cf_file = this->cf_stream;
+	    this->m->cf_file = this->m->cf_stream;
 	}
     }
     EncryptionData data(V, R, Length / 8, P, O, U, OE, UE, Perms,
-                        id1, this->encrypt_metadata);
+                        id1, this->m->encrypt_metadata);
     if (check_owner_password(
-	    this->user_password, this->provided_password, data))
+	    this->m->user_password, this->m->provided_password, data))
     {
 	// password supplied was owner password; user_password has
 	// been initialized for V < 5
     }
-    else if (check_user_password(this->provided_password, data))
+    else if (check_user_password(this->m->provided_password, data))
     {
-	this->user_password = this->provided_password;
+	this->m->user_password = this->m->provided_password;
     }
     else
     {
-	throw QPDFExc(qpdf_e_password, this->file->getName(),
+	throw QPDFExc(qpdf_e_password, this->m->file->getName(),
 		      "", 0, "invalid password");
     }
@@ -1028,8 +1032,8 @@ QPDF::initializeEncryption()
         // For V < 5, the user password is encrypted with the owner
         // password, and the user password is always used for
         // computing the encryption key.
-        this->encryption_key = compute_encryption_key(
-            this->user_password, data);
+        this->m->encryption_key = compute_encryption_key(
+            this->m->user_password, data);
     }
     else
     {
@@ -1037,12 +1041,13 @@ QPDF::initializeEncryption()
         // compute the encryption key, and neither password can be
         // used to recover the other.
         bool perms_valid;
-        this->encryption_key = recover_encryption_key_with_password(
-            this->provided_password, data, perms_valid);
+        this->m->encryption_key = recover_encryption_key_with_password(
+            this->m->provided_password, data, perms_valid);
         if (! perms_valid)
         {
-            warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-                         "encryption dictionary", this->file->getLastOffset(),
+            warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+                         "encryption dictionary",
+                         this->m->file->getLastOffset(),
                          "/Perms field in encryption dictionary"
                          " doesn't match expected value"));
         }
@@ -1052,23 +1057,24 @@ QPDF::initializeEncryption()
 std::string
 QPDF::getKeyForObject(int objid, int generation, bool use_aes)
 {
-    if (! this->encrypted)
+    if (! this->m->encrypted)
     {
 	throw std::logic_error(
 	    "request for encryption key in non-encrypted PDF");
     }
-    if (! ((objid == this->cached_key_objid) &&
-	   (generation == this->cached_key_generation)))
+    if (! ((objid == this->m->cached_key_objid) &&
+	   (generation == this->m->cached_key_generation)))
     {
-	this->cached_object_encryption_key =
-	    compute_data_key(this->encryption_key, objid, generation,
-                             use_aes, this->encryption_V, this->encryption_R);
-	this->cached_key_objid = objid;
-	this->cached_key_generation = generation;
+	this->m->cached_object_encryption_key =
+	    compute_data_key(this->m->encryption_key, objid, generation,
+                             use_aes, this->m->encryption_V,
+                             this->m->encryption_R);
+	this->m->cached_key_objid = objid;
+	this->m->cached_key_generation = generation;
     }
-    return this->cached_object_encryption_key;
+    return this->m->cached_object_encryption_key;
 }
 void
@@ -1079,9 +1085,9 @@ QPDF::decryptString(std::string&amp; str, int objid, int generation)
 	return;
     }
     bool use_aes = false;
-    if (this->encryption_V >= 4)
+    if (this->m->encryption_V >= 4)
     {
-	switch (this->cf_string)
+	switch (this->m->cf_string)
 	{
 	  case e_none:
 	    return;
@@ -1098,15 +1104,15 @@ QPDF::decryptString(std::string&amp; str, int objid, int generation)
 	    break;
 	  default:
-	    warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			 this->last_object_description,
-			 this->file->getLastOffset(),
+	    warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			 this->m->last_object_description,
+			 this->m->file->getLastOffset(),
 			 "unknown encryption filter for strings"
 			 " (check /StrF in /Encrypt dictionary);"
 			 " strings may be decrypted improperly"));
 	    // To avoid repeated warnings, reset cf_string.  Assume
 	    // we'd want to use AES if V == 4.
-	    this->cf_string = e_aes;
+	    this->m->cf_string = e_aes;
 	    break;
 	}
     }
@@ -1145,9 +1151,9 @@ QPDF::decryptString(std::string&amp; str, int objid, int generation)
     }
     catch (std::runtime_error& e)
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "error decrypting string for object " +
 		      QUtil::int_to_string(objid) + " " +
 		      QUtil::int_to_string(generation) + ": " + e.what());
@@ -1170,7 +1176,7 @@ QPDF::decryptStream(Pipeline*&amp; pipeline, int objid, int generation,
 	return;
     }
     bool use_aes = false;
-    if (this->encryption_V >= 4)
+    if (this->m->encryption_V >= 4)
     {
 	encryption_method_e method = e_unknown;
 	std::string method_source = "/StmF from /Encrypt dictionary";
@@ -1221,21 +1227,21 @@ QPDF::decryptStream(Pipeline*&amp; pipeline, int objid, int generation,
 	if (method == e_unknown)
 	{
-	    if ((! this->encrypt_metadata) && (type == "/Metadata"))
+	    if ((! this->m->encrypt_metadata) && (type == "/Metadata"))
 	    {
 		QTC::TC("qpdf", "QPDF_encryption cleartext metadata");
 		method = e_none;
 	    }
 	    else
 	    {
-                if (this->attachment_streams.count(
+                if (this->m->attachment_streams.count(
                         QPDFObjGen(objid, generation)) > 0)
                 {
-                    method = this->cf_file;
+                    method = this->m->cf_file;
                 }
                 else
                 {
-                    method = this->cf_stream;
+                    method = this->m->cf_stream;
                 }
 	    }
 	}
@@ -1259,15 +1265,15 @@ QPDF::decryptStream(Pipeline*&amp; pipeline, int objid, int generation,
 	  default:
 	    // filter local to this stream.
-	    warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-			 this->last_object_description,
-			 this->file->getLastOffset(),
+	    warn(QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+			 this->m->last_object_description,
+			 this->m->file->getLastOffset(),
 			 "unknown encryption filter for streams"
 			 " (check " + method_source + ");"
 			 " streams may be decrypted improperly"));
 	    // To avoid repeated warnings, reset cf_stream.  Assume
 	    // we'd want to use AES if V == 4.
-	    this->cf_stream = e_aes;
+	    this->m->cf_stream = e_aes;
 	    break;
 	}
     }
@@ -1331,13 +1337,13 @@ QPDF::compute_encryption_parameters_V5(
 std::string const&
 QPDF::getPaddedUserPassword() const
 {
-    return this->user_password;
+    return this->m->user_password;
 }
 std::string
 QPDF::getTrimmedUserPassword() const
 {
-    std::string result = this->user_password;
+    std::string result = this->m->user_password;
     trim_user_password(result);
     return result;
 }
@@ -1345,13 +1351,13 @@ QPDF::getTrimmedUserPassword() const
 std::string
 QPDF::getEncryptionKey() const
 {
-    return this->encryption_key;
+    return this->m->encryption_key;
 }
 bool
 QPDF::isEncrypted() const
 {
-    return this->encrypted;
+    return this->m->encrypted;
 }
 bool
@@ -1368,7 +1374,7 @@ QPDF::isEncrypted(int&amp; R, int&amp; P, int&amp; V,
                   encryption_method_e& string_method,
                   encryption_method_e& file_method)
 {
-    if (this->encrypted)
+    if (this->m->encrypted)
     {
 	QPDFObjectHandle trailer = getTrailer();
 	QPDFObjectHandle encrypt = trailer.getKey("/Encrypt");
@@ -1378,9 +1384,9 @@ QPDF::isEncrypted(int&amp; R, int&amp; P, int&amp; V,
 	P = Pkey.getIntValue();
 	R = Rkey.getIntValue();
         V = Vkey.getIntValue();
-        stream_method = this->cf_stream;
-        string_method = this->cf_stream;
-        file_method = this->cf_file;
+        stream_method = this->m->cf_stream;
+        string_method = this->m->cf_stream;
+        file_method = this->m->cf_file;
 	return true;
     }
     else
@@ -72,7 +72,7 @@ QPDF::checkLinearization()
     }
     catch (QPDFExc& e)
     {
-	*out_stream << e.what() << std::endl;
+	*this->m->out_stream << e.what() << std::endl;
     }
     return result;
 }
@@ -82,7 +82,7 @@ QPDF::isLinearized()
 {
     // If the first object in the file is a dictionary with a suitable
     // /Linearized key and has an /L key that accurately indicates the
-    // file size, initialize this->lindict and return true.
+    // file size, initialize this->m->lindict and return true.
     // A linearized PDF spec's first object will be contained within
     // the first 1024 bytes of the file and will be a dictionary with
@@ -95,10 +95,10 @@ QPDF::isLinearized()
     static int const tbuf_size = 1025;
     char* buf = new char[tbuf_size];
-    this->file->seek(0, SEEK_SET);
+    this->m->file->seek(0, SEEK_SET);
     PointerHolder<char> b(true, buf);
     memset(buf, '\0', tbuf_size);
-    this->file->read(buf, tbuf_size - 1);
+    this->m->file->read(buf, tbuf_size - 1);
     int lindict_obj = -1;
     char* p = buf;
@@ -115,16 +115,16 @@ QPDF::isLinearized()
         }
         // Seek to the digit. Then skip over digits for a potential
         // next iteration.
-        this->file->seek(p - buf, SEEK_SET);
+        this->m->file->seek(p - buf, SEEK_SET);
         while (((p - buf) < tbuf_size) && QUtil::is_digit(*p))
         {
             ++p;
         }
-        QPDFTokenizer::Token t1 = readToken(this->file, true);
-        QPDFTokenizer::Token t2 = readToken(this->file, true);
-        QPDFTokenizer::Token t3 = readToken(this->file, true);
-        QPDFTokenizer::Token t4 = readToken(this->file, true);
+        QPDFTokenizer::Token t1 = readToken(this->m->file, true);
+        QPDFTokenizer::Token t2 = readToken(this->m->file, true);
+        QPDFTokenizer::Token t3 = readToken(this->m->file, true);
+        QPDFTokenizer::Token t4 = readToken(this->m->file, true);
         if ((t1.getType() == QPDFTokenizer::tt_integer) &&
             (t2.getType() == QPDFTokenizer::tt_integer) &&
             (t3 == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "obj")) &&
@@ -158,19 +158,19 @@ QPDF::isLinearized()
     if (L.isInteger())
     {
 	qpdf_offset_t Li = L.getIntValue();
-	this->file->seek(0, SEEK_END);
-	if (Li != this->file->tell())
+	this->m->file->seek(0, SEEK_END);
+	if (Li != this->m->file->tell())
 	{
 	    QTC::TC("qpdf", "QPDF /L mismatch");
 	    return false;
 	}
 	else
 	{
-	    this->linp.file_size = Li;
+	    this->m->linp.file_size = Li;
 	}
     }
-    this->lindict = candidate;
+    this->m->lindict = candidate;
     return true;
 }
@@ -191,12 +191,12 @@ QPDF::readLinearizationData()
     }
     // /L is read and stored in linp by isLinearized()
-    QPDFObjectHandle H = lindict.getKey("/H");
-    QPDFObjectHandle O = lindict.getKey("/O");
-    QPDFObjectHandle E = lindict.getKey("/E");
-    QPDFObjectHandle N = lindict.getKey("/N");
-    QPDFObjectHandle T = lindict.getKey("/T");
-    QPDFObjectHandle P = lindict.getKey("/P");
+    QPDFObjectHandle H = this->m->lindict.getKey("/H");
+    QPDFObjectHandle O = this->m->lindict.getKey("/O");
+    QPDFObjectHandle E = this->m->lindict.getKey("/E");
+    QPDFObjectHandle N = this->m->lindict.getKey("/N");
+    QPDFObjectHandle T = this->m->lindict.getKey("/T");
+    QPDFObjectHandle P = this->m->lindict.getKey("/P");
     if (! (H.isArray() &&
 	   O.isInteger() &&
@@ -205,9 +205,9 @@ QPDF::readLinearizationData()
 	   T.isInteger() &&
 	   (P.isInteger() || P.isNull())))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "linearization dictionary",
-		      this->file->getLastOffset(),
+		      this->m->file->getLastOffset(),
 		      "some keys in linearization dictionary are of "
 		      "the wrong type");
     }
@@ -216,9 +216,9 @@ QPDF::readLinearizationData()
     unsigned int n_H_items = H.getArrayNItems();
     if (! ((n_H_items == 2) || (n_H_items == 4)))
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "linearization dictionary",
-		      this->file->getLastOffset(),
+		      this->m->file->getLastOffset(),
 		      "H has the wrong number of items");
     }
@@ -232,9 +232,9 @@ QPDF::readLinearizationData()
 	}
 	else
 	{
-	    throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	    throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 			  "linearization dictionary",
-			  this->file->getLastOffset(),
+			  this->m->file->getLastOffset(),
 			  "some H items are of the wrong type");
 	}
     }
@@ -272,20 +272,20 @@ QPDF::readLinearizationData()
     // accurate and bail right now if it's not.
     if (N.getIntValue() != static_cast<long long>(getAllPages().size()))
     {
-        throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+        throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                       "linearization hint table",
-                      this->file->getLastOffset(),
+                      this->m->file->getLastOffset(),
                       "/N does not match number of pages");
     }
     // file_size initialized by isLinearized()
-    this->linp.first_page_object = O.getIntValue();
-    this->linp.first_page_end = E.getIntValue();
-    this->linp.npages = N.getIntValue();
-    this->linp.xref_zero_offset = T.getIntValue();
-    this->linp.first_page = first_page;
-    this->linp.H_offset = H0_offset;
-    this->linp.H_length = H0_length;
+    this->m->linp.first_page_object = O.getIntValue();
+    this->m->linp.first_page_end = E.getIntValue();
+    this->m->linp.npages = N.getIntValue();
+    this->m->linp.xref_zero_offset = T.getIntValue();
+    this->m->linp.first_page = first_page;
+    this->m->linp.H_offset = H0_offset;
+    this->m->linp.H_length = H0_length;
     // Read hint streams
@@ -320,9 +320,9 @@ QPDF::readLinearizationData()
     int HSi = HS.getIntValue();
     if ((HSi < 0) || (HSi >= h_size))
     {
-        throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+        throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                       "linearization hint table",
-                      this->file->getLastOffset(),
+                      this->m->file->getLastOffset(),
                       "/S (shared object) offset is out of bounds");
     }
     readHSharedObject(BitStream(h_buf + HSi, h_size - HSi));
@@ -332,13 +332,13 @@ QPDF::readLinearizationData()
 	int HOi = HO.getIntValue();
         if ((HOi < 0) || (HOi >= h_size))
         {
-            throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+            throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
                           "linearization hint table",
-                          this->file->getLastOffset(),
+                          this->m->file->getLastOffset(),
                           "/O (outline) offset is out of bounds");
         }
 	readHGeneric(BitStream(h_buf + HOi, h_size - HOi),
-		     this->outline_hints);
+		     this->m->outline_hints);
     }
 }
@@ -349,14 +349,14 @@ QPDF::readHintStream(Pipeline&amp; pl, qpdf_offset_t offset, size_t length)
     int gen;
     QPDFObjectHandle H = readObjectAtOffset(
 	false, offset, "linearization hint stream", -1, 0, obj, gen);
-    ObjCache& oc = this->obj_cache[QPDFObjGen(obj, gen)];
+    ObjCache& oc = this->m->obj_cache[QPDFObjGen(obj, gen)];
     qpdf_offset_t min_end_offset = oc.end_before_space;
     qpdf_offset_t max_end_offset = oc.end_after_space;
     if (! H.isStream())
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "linearization dictionary",
-		      this->file->getLastOffset(),
+		      this->m->file->getLastOffset(),
 		      "hint table is not a stream");
     }
@@ -373,7 +373,7 @@ QPDF::readHintStream(Pipeline&amp; pl, qpdf_offset_t offset, size_t length)
 	QTC::TC("qpdf", "QPDF hint table length indirect");
 	// Force resolution
 	(void) length_obj.getIntValue();
-	ObjCache& oc = this->obj_cache[length_obj.getObjGen()];
+	ObjCache& oc = this->m->obj_cache[length_obj.getObjGen()];
 	min_end_offset = oc.end_before_space;
 	max_end_offset = oc.end_after_space;
     }
@@ -385,12 +385,12 @@ QPDF::readHintStream(Pipeline&amp; pl, qpdf_offset_t offset, size_t length)
     if ((computed_end < min_end_offset) ||
 	(computed_end > max_end_offset))
     {
-	*out_stream << "expected = " << computed_end
-		    << "; actual = " << min_end_offset << ".."
-		    << max_end_offset << std::endl;
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
+	*this->m->out_stream << "expected = " << computed_end
+                             << "; actual = " << min_end_offset << ".."
+                             << max_end_offset << std::endl;
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
 		      "linearization dictionary",
-		      this->file->getLastOffset(),
+		      this->m->file->getLastOffset(),
 		      "hint table length mismatch");
     }
     H.pipeStreamData(&pl, 0, qpdf_dl_specialized);
@@ -403,7 +403,7 @@ QPDF::readHPageOffset(BitStream h)
     // All comments referring to the PDF spec refer to the spec for
     // version 1.4.
-    HPageOffset& t = this->page_offset_hints;
+    HPageOffset& t = this->m->page_offset_hints;
     t.min_nobjects = h.getBits(32);		  	    // 1
     t.first_page_offset = h.getBits(32);		    // 2
@@ -421,7 +421,7 @@ QPDF::readHPageOffset(BitStream h)
     std::vector<HPageOffsetEntry>& entries = t.entries;
     entries.clear();
-    unsigned int nitems = this->linp.npages;
+    unsigned int nitems = this->m->linp.npages;
     load_vector_int(h, nitems, entries,
 		    t.nbits_delta_nobjects,
 		    &HPageOffsetEntry::delta_nobjects);
@@ -450,7 +450,7 @@ QPDF::readHPageOffset(BitStream h)
 void
 QPDF::readHSharedObject(BitStream h)
 {
-    HSharedObject& t = this->shared_object_hints;
+    HSharedObject& t = this->m->shared_object_hints;
     t.first_shared_obj = h.getBits(32);			    // 1
     t.first_shared_offset = h.getBits(32);		    // 2
@@ -509,7 +509,7 @@ QPDF::checkLinearizationInternal()
     // Check all values in linearization parameter dictionary
-    LinParameters& p = this->linp;
+    LinParameters& p = this->m->linp;
     // L: file size in bytes -- checked by isLinearized
@@ -533,7 +533,7 @@ QPDF::checkLinearizationInternal()
     {
 	QPDFObjectHandle const& page = pages.at(i);
 	QPDFObjGen og(page.getObjGen());
-	if (this->xref_table[og].getType() == 2)
+	if (this->m->xref_table[og].getType() == 2)
 	{
 	    errors.push_back("page dictionary for page " +
 			     QUtil::int_to_string(i) + " is compressed");
@@ -541,25 +541,25 @@ QPDF::checkLinearizationInternal()
     }
     // T: offset of whitespace character preceding xref entry for object 0
-    this->file->seek(p.xref_zero_offset, SEEK_SET);
+    this->m->file->seek(p.xref_zero_offset, SEEK_SET);
     while (1)
     {
 	char ch;
-	this->file->read(&ch, 1);
+	this->m->file->read(&ch, 1);
 	if (! ((ch == ' ') || (ch == '\r') || (ch == '\n')))
 	{
-	    this->file->seek(-1, SEEK_CUR);
+	    this->m->file->seek(-1, SEEK_CUR);
 	    break;
 	}
     }
-    if (this->file->tell() != this->first_xref_item_offset)
+    if (this->m->file->tell() != this->m->first_xref_item_offset)
     {
 	QTC::TC("qpdf", "QPDF err /T mismatch");
 	errors.push_back("space before first xref item (/T) mismatch "
 			 "(computed = " +
-			 QUtil::int_to_string(this->first_xref_item_offset) +
+			 QUtil::int_to_string(this->m->first_xref_item_offset) +
 			 "; file = " +
-			 QUtil::int_to_string(this->file->tell()));
+			 QUtil::int_to_string(this->m->file->tell()));
     }
     // P: first page number -- Implementation note 124 says Acrobat
@@ -570,7 +570,7 @@ QPDF::checkLinearizationInternal()
     // at the end of the containing xref section if any object streams
     // are in use.
-    if (this->uncompressed_after_compressed)
+    if (this->m->uncompressed_after_compressed)
     {
 	errors.push_back("linearized file contains an uncompressed object"
 			 " after a compressed one in a cross-reference stream");
@@ -584,8 +584,8 @@ QPDF::checkLinearizationInternal()
     { // local scope
 	std::map<int, int> object_stream_data;
 	for (std::map<QPDFObjGen, QPDFXRefEntry>::const_iterator iter =
-		 this->xref_table.begin();
-	     iter != this->xref_table.end(); ++iter)
+		 this->m->xref_table.begin();
+	     iter != this->m->xref_table.end(); ++iter)
 	{
 	    QPDFObjGen const& og = (*iter).first;
 	    QPDFXRefEntry const& entry = (*iter).second;
@@ -609,22 +609,22 @@ QPDF::checkLinearizationInternal()
     // agree with pdlin.  As of this writing, the test suite doesn't
     // contain any files with threads.
-    if (this->part6.empty())
+    if (this->m->part6.empty())
     {
         throw std::logic_error("linearization part 6 unexpectedly empty");
     }
     qpdf_offset_t min_E = -1;
     qpdf_offset_t max_E = -1;
-    for (std::vector<QPDFObjectHandle>::iterator iter = this->part6.begin();
-	 iter != this->part6.end(); ++iter)
+    for (std::vector<QPDFObjectHandle>::iterator iter = this->m->part6.begin();
+	 iter != this->m->part6.end(); ++iter)
     {
 	QPDFObjGen og((*iter).getObjGen());
-	if (this->obj_cache.count(og) == 0)
+	if (this->m->obj_cache.count(og) == 0)
         {
             // All objects have to have been dereferenced to be classified.
             throw std::logic_error("linearization part6 object not in cache");
         }
-	ObjCache const& oc = this->obj_cache[og];
+	ObjCache const& oc = this->m->obj_cache[og];
 	min_E = std::max(min_E, oc.end_before_space);
 	max_E = std::max(max_E, oc.end_after_space);
     }
@@ -655,7 +655,7 @@ QPDF::checkLinearizationInternal()
 	for (std::list<std::string>::iterator iter = errors.begin();
 	     iter != errors.end(); ++iter)
 	{
-	    *out_stream << "ERROR: " << (*iter) << std::endl;
+	    *this->m->out_stream << "ERROR: " << (*iter) << std::endl;
 	}
     }
@@ -665,7 +665,7 @@ QPDF::checkLinearizationInternal()
 	for (std::list<std::string>::iterator iter = warnings.begin();
 	     iter != warnings.end(); ++iter)
 	{
-	    *out_stream << "WARNING: " << (*iter) << std::endl;
+	    *this->m->out_stream << "WARNING: " << (*iter) << std::endl;
 	}
     }
@@ -675,15 +675,15 @@ QPDF::checkLinearizationInternal()
 qpdf_offset_t
 QPDF::maxEnd(ObjUser const& ou)
 {
-    assert(this->obj_user_to_objects.count(ou) > 0);
-    std::set<QPDFObjGen> const& ogs = this->obj_user_to_objects[ou];
+    assert(this->m->obj_user_to_objects.count(ou) > 0);
+    std::set<QPDFObjGen> const& ogs = this->m->obj_user_to_objects[ou];
     qpdf_offset_t end = 0;
     for (std::set<QPDFObjGen>::const_iterator iter = ogs.begin();
 	 iter != ogs.end(); ++iter)
     {
 	QPDFObjGen const& og = *iter;
-	assert(this->obj_cache.count(og) > 0);
-	end = std::max(end, this->obj_cache[og].end_after_space);
+	assert(this->m->obj_cache.count(og) > 0);
+	end = std::max(end, this->m->obj_cache[og].end_after_space);
     }
     return end;
 }
@@ -691,7 +691,7 @@ QPDF::maxEnd(ObjUser const&amp; ou)
 qpdf_offset_t
 QPDF::getLinearizationOffset(QPDFObjGen const& og)
 {
-    QPDFXRefEntry entry = this->xref_table[og];
+    QPDFXRefEntry entry = this->m->xref_table[og];
     qpdf_offset_t result = 0;
     switch (entry.getType())
     {
@@ -737,7 +737,7 @@ QPDF::lengthNextN(int first_object, int n,
     for (int i = 0; i < n; ++i)
     {
 	QPDFObjGen og(first_object + i, 0);
-	if (this->xref_table.count(og) == 0)
+	if (this->m->xref_table.count(og) == 0)
 	{
 	    errors.push_back(
 		"no xref table entry for " +
@@ -745,8 +745,8 @@ QPDF::lengthNextN(int first_object, int n,
 	}
 	else
 	{
-	    assert(this->obj_cache.count(og) > 0);
-	    length += this->obj_cache[og].end_after_space -
+	    assert(this->m->obj_cache.count(og) > 0);
+	    length += this->m->obj_cache[og].end_after_space -
 		getLinearizationOffset(og);
 	}
     }
@@ -778,9 +778,9 @@ QPDF::checkHPageOffset(std::list&lt;std::string&gt;&amp; errors,
     unsigned int npages = pages.size();
     int table_offset = adjusted_offset(
-	this->page_offset_hints.first_page_offset);
+	this->m->page_offset_hints.first_page_offset);
     QPDFObjGen first_page_og(pages.at(0).getObjGen());
-    assert(this->xref_table.count(first_page_og) > 0);
+    assert(this->m->xref_table.count(first_page_og) > 0);
     int offset = getLinearizationOffset(first_page_og);
     if (table_offset != offset)
     {
@@ -791,13 +791,13 @@ QPDF::checkHPageOffset(std::list&lt;std::string&gt;&amp; errors,
     {
 	QPDFObjGen page_og(pages.at(pageno).getObjGen());
 	int first_object = page_og.getObj();
-	assert(this->xref_table.count(page_og) > 0);
+	assert(this->m->xref_table.count(page_og) > 0);
 	offset = getLinearizationOffset(page_og);
-	HPageOffsetEntry& he = this->page_offset_hints.entries.at(pageno);
-	CHPageOffsetEntry& ce = this->c_page_offset_data.entries.at(pageno);
+	HPageOffsetEntry& he = this->m->page_offset_hints.entries.at(pageno);
+	CHPageOffsetEntry& ce = this->m->c_page_offset_data.entries.at(pageno);
 	int h_nobjects = he.delta_nobjects +
-	    this->page_offset_hints.min_nobjects;
+	    this->m->page_offset_hints.min_nobjects;
 	if (h_nobjects != ce.nobjects)
 	{
 	    // This happens with pdlin when there are thumbnails.
@@ -812,7 +812,7 @@ QPDF::checkHPageOffset(std::list&lt;std::string&gt;&amp; errors,
 	// computed value if there is a discrepancy.
 	int length = lengthNextN(first_object, h_nobjects, errors);
 	int h_length = he.delta_page_length +
-	    this->page_offset_hints.min_page_length;
+	    this->m->page_offset_hints.min_page_length;
 	if (length != h_length)
 	{
 	    // This condition almost certainly indicates a bad hint
@@ -853,12 +853,12 @@ QPDF::checkHPageOffset(std::list&lt;std::string&gt;&amp; errors,
 	for (int i = 0; i < ce.nshared_objects; ++i)
 	{
 	    int idx = ce.shared_identifiers.at(i);
-	    if (idx >= this->c_shared_object_data.nshared_total)
+	    if (idx >= this->m->c_shared_object_data.nshared_total)
             {
                 throw std::logic_error(
                     "index out of bounds for shared object hint table");
             }
-	    int obj = this->c_shared_object_data.entries.at(idx).object;
+	    int obj = this->m->c_shared_object_data.entries.at(idx).object;
 	    computed_shared.insert(obj);
 	}
@@ -916,7 +916,7 @@ QPDF::checkHSharedObject(std::list&lt;std::string&gt;&amp; errors,
     // these whenever there are no shared objects not referenced by
     // the first page (i.e., nshared_total == nshared_first_page).
-    HSharedObject& so = this->shared_object_hints;
+    HSharedObject& so = this->m->shared_object_hints;
     if (so.nshared_total < so.nshared_first_page)
     {
 	errors.push_back("shared object hint table: ntotal < nfirst_page");
@@ -932,7 +932,7 @@ QPDF::checkHSharedObject(std::list&lt;std::string&gt;&amp; errors,
 	    if (i == so.nshared_first_page)
 	    {
 		QTC::TC("qpdf", "QPDF lin check shared past first page");
-		if (this->part8.empty())
+		if (this->m->part8.empty())
 		{
 		    errors.push_back(
 			"part 8 is empty but nshared_total > "
@@ -940,7 +940,7 @@ QPDF::checkHSharedObject(std::list&lt;std::string&gt;&amp; errors,
 		}
 		else
 		{
-		    int obj = this->part8.at(0).getObjectID();
+		    int obj = this->m->part8.at(0).getObjectID();
 		    if (obj != so.first_shared_obj)
 		    {
 			errors.push_back(
@@ -955,7 +955,7 @@ QPDF::checkHSharedObject(std::list&lt;std::string&gt;&amp; errors,
 		cur_object = so.first_shared_obj;
 		QPDFObjGen og(cur_object, 0);
-		assert(this->xref_table.count(og) > 0);
+		assert(this->m->xref_table.count(og) > 0);
 		int offset = getLinearizationOffset(og);
 		int h_offset = adjusted_offset(so.first_shared_offset);
 		if (offset != h_offset)
@@ -996,15 +996,15 @@ QPDF::checkHOutlines(std::list&lt;std::string&gt;&amp; warnings)
     // wrong starting place).  pdlin appears to generate correct
     // values in those cases.
-    if (this->c_outline_data.nobjects == this->outline_hints.nobjects)
+    if (this->m->c_outline_data.nobjects == this->m->outline_hints.nobjects)
     {
-	if (this->c_outline_data.nobjects == 0)
+	if (this->m->c_outline_data.nobjects == 0)
 	{
 	    return;
 	}
-	if (this->c_outline_data.first_object ==
-	    this->outline_hints.first_object)
+	if (this->m->c_outline_data.first_object ==
+	    this->m->outline_hints.first_object)
 	{
 	    // Check length and offset.  Acrobat gets these wrong.
 	    QPDFObjectHandle outlines = getRoot().getKey("/Outlines");
@@ -1018,12 +1018,12 @@ QPDF::checkHOutlines(std::list&lt;std::string&gt;&amp; warnings)
                 return;
             }
 	    QPDFObjGen og(outlines.getObjGen());
-	    assert(this->xref_table.count(og) > 0);
+	    assert(this->m->xref_table.count(og) > 0);
 	    int offset = getLinearizationOffset(og);
 	    ObjUser ou(ObjUser::ou_root_key, "/Outlines");
 	    int length = maxEnd(ou) - offset;
 	    int table_offset =
-		adjusted_offset(this->outline_hints.first_object_offset);
+		adjusted_offset(this->m->outline_hints.first_object_offset);
 	    if (offset != table_offset)
 	    {
 		warnings.push_back(
@@ -1031,7 +1031,7 @@ QPDF::checkHOutlines(std::list&lt;std::string&gt;&amp; warnings)
 		    QUtil::int_to_string(table_offset) +
 		    "; computed = " + QUtil::int_to_string(offset));
 	    }
-	    int table_length = this->outline_hints.group_length;
+	    int table_length = this->m->outline_hints.group_length;
 	    if (length != table_length)
 	    {
 		warnings.push_back(
@@ -1063,41 +1063,42 @@ QPDF::showLinearizationData()
     }
     catch (QPDFExc& e)
     {
-	*out_stream << e.what() << std::endl;
+	*this->m->out_stream << e.what() << std::endl;
     }
 }
 void
 QPDF::dumpLinearizationDataInternal()
 {
-    *out_stream << this->file->getName() << ": linearization data:" << std::endl
-		<< std::endl;
-
-    *out_stream
-	<< "file_size: " << this->linp.file_size << std::endl
-	<< "first_page_object: " << this->linp.first_page_object << std::endl
-	<< "first_page_end: " << this->linp.first_page_end << std::endl
-	<< "npages: " << this->linp.npages << std::endl
-	<< "xref_zero_offset: " << this->linp.xref_zero_offset << std::endl
-	<< "first_page: " << this->linp.first_page << std::endl
-	<< "H_offset: " << this->linp.H_offset << std::endl
-	<< "H_length: " << this->linp.H_length << std::endl
+    *this->m->out_stream
+        << this->m->file->getName() << ": linearization data:" << std::endl
+        << std::endl;
+
+    *this->m->out_stream
+	<< "file_size: " << this->m->linp.file_size << std::endl
+	<< "first_page_object: " << this->m->linp.first_page_object << std::endl
+	<< "first_page_end: " << this->m->linp.first_page_end << std::endl
+	<< "npages: " << this->m->linp.npages << std::endl
+	<< "xref_zero_offset: " << this->m->linp.xref_zero_offset << std::endl
+	<< "first_page: " << this->m->linp.first_page << std::endl
+	<< "H_offset: " << this->m->linp.H_offset << std::endl
+	<< "H_length: " << this->m->linp.H_length << std::endl
 	<< std::endl;
-    *out_stream << "Page Offsets Hint Table" << std::endl
-		<< std::endl;
+    *this->m->out_stream << "Page Offsets Hint Table" << std::endl
+                         << std::endl;
     dumpHPageOffset();
-    *out_stream << std::endl
-		<< "Shared Objects Hint Table" << std::endl
-		<< std::endl;
+    *this->m->out_stream << std::endl
+                         << "Shared Objects Hint Table" << std::endl
+                         << std::endl;
     dumpHSharedObject();
-    if (this->outline_hints.nobjects > 0)
+    if (this->m->outline_hints.nobjects > 0)
     {
-	*out_stream << std::endl
-		    << "Outlines Hint Table" << std::endl
-		    << std::endl;
-	dumpHGeneric(this->outline_hints);
+	*this->m->out_stream << std::endl
+                             << "Outlines Hint Table" << std::endl
+                             << std::endl;
+	dumpHGeneric(this->m->outline_hints);
     }
 }
@@ -1107,9 +1108,9 @@ QPDF::adjusted_offset(int offset)
     // All offsets >= H_offset have to be increased by H_length
     // since all hint table location values disregard the hint table
     // itself.
-    if (offset >= this->linp.H_offset)
+    if (offset >= this->m->linp.H_offset)
     {
-	return offset + this->linp.H_length;
+	return offset + this->m->linp.H_length;
     }
     return offset;
 }
@@ -1118,8 +1119,8 @@ QPDF::adjusted_offset(int offset)
 void
 QPDF::dumpHPageOffset()
 {
-    HPageOffset& t = this->page_offset_hints;
-    *out_stream
+    HPageOffset& t = this->m->page_offset_hints;
+    *this->m->out_stream
 	<< "min_nobjects: " << t.min_nobjects
 	<< std::endl
 	<< "first_page_offset: " << adjusted_offset(t.first_page_offset)
@@ -1147,10 +1148,10 @@ QPDF::dumpHPageOffset()
 	<< "shared_denominator: " << t.shared_denominator
 	<< std::endl;
-    for (int i1 = 0; i1 < this->linp.npages; ++i1)
+    for (int i1 = 0; i1 < this->m->linp.npages; ++i1)
     {
 	HPageOffsetEntry& pe = t.entries.at(i1);
-	*out_stream
+	*this->m->out_stream
 	    << "Page " << i1 << ":" << std::endl
 	    << "  nobjects: " << pe.delta_nobjects + t.min_nobjects
 	    << std::endl
@@ -1164,10 +1165,10 @@ QPDF::dumpHPageOffset()
 	    << "  nshared_objects: " << pe.nshared_objects << std::endl;
 	for (int i2 = 0; i2 < pe.nshared_objects; ++i2)
 	{
-	    *out_stream << "    identifier " << i2 << ": "
-			<< pe.shared_identifiers.at(i2) << std::endl;
-	    *out_stream << "    numerator " << i2 << ": "
-			<< pe.shared_numerators.at(i2) << std::endl;
+	    *this->m->out_stream << "    identifier " << i2 << ": "
+                                 << pe.shared_identifiers.at(i2) << std::endl;
+	    *this->m->out_stream << "    numerator " << i2 << ": "
+                                 << pe.shared_numerators.at(i2) << std::endl;
 	}
     }
 }
@@ -1175,8 +1176,8 @@ QPDF::dumpHPageOffset()
 void
 QPDF::dumpHSharedObject()
 {
-    HSharedObject& t = this->shared_object_hints;
-    *out_stream
+    HSharedObject& t = this->m->shared_object_hints;
+    *this->m->out_stream
 	<< "first_shared_obj: " << t.first_shared_obj
 	<< std::endl
 	<< "first_shared_offset: " << adjusted_offset(t.first_shared_offset)
@@ -1195,19 +1196,20 @@ QPDF::dumpHSharedObject()
     for (int i = 0; i < t.nshared_total; ++i)
     {
 	HSharedObjectEntry& se = t.entries.at(i);
-	*out_stream << "Shared Object " << i << ":" << std::endl;
-	*out_stream << "  group length: "
-		    << se.delta_group_length + t.min_group_length << std::endl;
+	*this->m->out_stream
+            << "Shared Object " << i << ":" << std::endl
+            << "  group length: "
+            << se.delta_group_length + t.min_group_length << std::endl;
 	// PDF spec says signature present nobjects_minus_one are
 	// always 0, so print them only if they have a non-zero value.
 	if (se.signature_present)
 	{
-	    *out_stream << "  signature present" << std::endl;
+	    *this->m->out_stream << "  signature present" << std::endl;
 	}
 	if (se.nobjects_minus_one != 0)
 	{
-	    *out_stream << "  nobjects: "
-			<< se.nobjects_minus_one + 1 << std::endl;
+	    *this->m->out_stream << "  nobjects: "
+                                 << se.nobjects_minus_one + 1 << std::endl;
 	}
     }
 }
@@ -1215,7 +1217,7 @@ QPDF::dumpHSharedObject()
 void
 QPDF::dumpHGeneric(HGeneric& t)
 {
-    *out_stream
+    *this->m->out_stream
 	<< "first_object: " << t.first_object
 	<< std::endl
 	<< "first_object_offset: " << adjusted_offset(t.first_object_offset)
@@ -1242,7 +1244,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     // this function.  Note that actual offsets and lengths are not
     // computed here, but anything related to object ordering is.
-    if (this->object_to_obj_users.empty())
+    if (this->m->object_to_obj_users.empty())
     {
 	// Note that we can't call optimize here because we don't know
 	// whether it should be called with or without allow changes.
@@ -1298,15 +1300,15 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     //   * outlines: part 6 or 9
-    this->part4.clear();
-    this->part6.clear();
-    this->part7.clear();
-    this->part8.clear();
-    this->part9.clear();
-    this->c_linp = LinParameters();
-    this->c_page_offset_data = CHPageOffset();
-    this->c_shared_object_data = CHSharedObject();
-    this->c_outline_data = HGeneric();
+    this->m->part4.clear();
+    this->m->part6.clear();
+    this->m->part7.clear();
+    this->m->part8.clear();
+    this->m->part9.clear();
+    this->m->c_linp = LinParameters();
+    this->m->c_page_offset_data = CHPageOffset();
+    this->m->c_shared_object_data = CHSharedObject();
+    this->m->c_outline_data = HGeneric();
     QPDFObjectHandle root = getRoot();
     bool outlines_in_first_page = false;
@@ -1349,8 +1351,8 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     std::set<QPDFObjGen> lc_root;
     for (std::map<QPDFObjGen, std::set<ObjUser> >::iterator oiter =
-	     this->object_to_obj_users.begin();
-	 oiter != this->object_to_obj_users.end(); ++oiter)
+	     this->m->object_to_obj_users.begin();
+	 oiter != this->m->object_to_obj_users.end(); ++oiter)
     {
 	QPDFObjGen const& og = (*oiter).first;
@@ -1505,17 +1507,18 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     // npages is the size of the existing pages vector, which has been
     // created by traversing the pages tree, and as such is a
     // reasonable size.
-    this->c_linp.npages = npages;
-    this->c_page_offset_data.entries = std::vector<CHPageOffsetEntry>(npages);
+    this->m->c_linp.npages = npages;
+    this->m->c_page_offset_data.entries =
+        std::vector<CHPageOffsetEntry>(npages);
     // Part 4: open document objects.  We don't care about the order.
     assert(lc_root.size() == 1);
-    this->part4.push_back(objGenToIndirect(*(lc_root.begin())));
+    this->m->part4.push_back(objGenToIndirect(*(lc_root.begin())));
     for (std::set<QPDFObjGen>::iterator iter = lc_open_document.begin();
 	 iter != lc_open_document.end(); ++iter)
     {
-	this->part4.push_back(objGenToIndirect(*iter));
+	this->m->part4.push_back(objGenToIndirect(*iter));
     }
     // Part 6: first page objects.  Note: implementation note 124
@@ -1533,8 +1536,8 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	    "object not in lc_first_page_private");
     }
     lc_first_page_private.erase(first_page_og);
-    this->c_linp.first_page_object = pages.at(0).getObjectID();
-    this->part6.push_back(pages.at(0));
+    this->m->c_linp.first_page_object = pages.at(0).getObjectID();
+    this->m->part6.push_back(pages.at(0));
     // The PDF spec "recommends" an order for the rest of the objects,
     // but we are going to disregard it except to the extent that it
@@ -1544,19 +1547,19 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     for (std::set<QPDFObjGen>::iterator iter = lc_first_page_private.begin();
 	 iter != lc_first_page_private.end(); ++iter)
     {
-	this->part6.push_back(objGenToIndirect(*iter));
+	this->m->part6.push_back(objGenToIndirect(*iter));
     }
     for (std::set<QPDFObjGen>::iterator iter = lc_first_page_shared.begin();
 	 iter != lc_first_page_shared.end(); ++iter)
     {
-	this->part6.push_back(objGenToIndirect(*iter));
+	this->m->part6.push_back(objGenToIndirect(*iter));
     }
     // Place the outline dictionary if it goes in the first page section.
     if (outlines_in_first_page)
     {
-	pushOutlinesToPart(this->part6, lc_outlines, object_stream_data);
+	pushOutlinesToPart(this->m->part6, lc_outlines, object_stream_data);
     }
     // Fill in page offset hint table information for the first page.
@@ -1565,7 +1568,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     // in garbage values for all the shared object identifiers on the
     // first page.
-    this->c_page_offset_data.entries.at(0).nobjects = this->part6.size();
+    this->m->c_page_offset_data.entries.at(0).nobjects = this->m->part6.size();
     // Part 7: other pages' private objects
@@ -1583,16 +1586,16 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 		QUtil::int_to_string(i) + " not in lc_other_page_private");
 	}
 	lc_other_page_private.erase(page_og);
-	this->part7.push_back(pages.at(i));
+	this->m->part7.push_back(pages.at(i));
 	// Place all non-shared objects referenced by this page,
 	// updating the page object count for the hint table.
-	this->c_page_offset_data.entries.at(i).nobjects = 1;
+	this->m->c_page_offset_data.entries.at(i).nobjects = 1;
 	ObjUser ou(ObjUser::ou_page, i);
-	assert(this->obj_user_to_objects.count(ou) > 0);
-	std::set<QPDFObjGen> ogs = this->obj_user_to_objects[ou];
+	assert(this->m->obj_user_to_objects.count(ou) > 0);
+	std::set<QPDFObjGen> ogs = this->m->obj_user_to_objects[ou];
 	for (std::set<QPDFObjGen>::iterator iter = ogs.begin();
 	     iter != ogs.end(); ++iter)
 	{
@@ -1600,8 +1603,8 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	    if (lc_other_page_private.count(og))
 	    {
 		lc_other_page_private.erase(og);
-		this->part7.push_back(objGenToIndirect(og));
-		++this->c_page_offset_data.entries.at(i).nobjects;
+		this->m->part7.push_back(objGenToIndirect(og));
+		++this->m->c_page_offset_data.entries.at(i).nobjects;
 	    }
 	}
     }
@@ -1620,7 +1623,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     for (std::set<QPDFObjGen>::iterator iter = lc_other_page_shared.begin();
 	 iter != lc_other_page_shared.end(); ++iter)
     {
-	this->part8.push_back(objGenToIndirect(*iter));
+	this->m->part8.push_back(objGenToIndirect(*iter));
     }
     // Part 9: other objects
@@ -1634,7 +1637,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     // Place the pages tree.
     std::set<QPDFObjGen> pages_ogs =
-	this->obj_user_to_objects[ObjUser(ObjUser::ou_root_key, "/Pages")];
+	this->m->obj_user_to_objects[ObjUser(ObjUser::ou_root_key, "/Pages")];
     assert(! pages_ogs.empty());
     for (std::set<QPDFObjGen>::iterator iter = pages_ogs.begin();
 	 iter != pages_ogs.end(); ++iter)
@@ -1643,7 +1646,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	if (lc_other.count(og))
 	{
 	    lc_other.erase(og);
-	    this->part9.push_back(objGenToIndirect(og));
+	    this->m->part9.push_back(objGenToIndirect(og));
 	}
     }
@@ -1661,7 +1664,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	    if (lc_thumbnail_private.count(thumb_og))
 	    {
 		lc_thumbnail_private.erase(thumb_og);
-		this->part9.push_back(thumb);
+		this->m->part9.push_back(thumb);
 	    }
 	    else
 	    {
@@ -1673,7 +1676,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 		// lc_thumbnail_private.
 	    }
 	    std::set<QPDFObjGen>& ogs =
-		this->obj_user_to_objects[ObjUser(ObjUser::ou_thumb, i)];
+		this->m->obj_user_to_objects[ObjUser(ObjUser::ou_thumb, i)];
 	    for (std::set<QPDFObjGen>::iterator iter = ogs.begin();
 		 iter != ogs.end(); ++iter)
 	    {
@@ -1681,7 +1684,7 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 		if (lc_thumbnail_private.count(og))
 		{
 		    lc_thumbnail_private.erase(og);
-		    this->part9.push_back(objGenToIndirect(og));
+		    this->m->part9.push_back(objGenToIndirect(og));
 		}
 	    }
 	}
@@ -1698,28 +1701,28 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     for (std::set<QPDFObjGen>::iterator iter = lc_thumbnail_shared.begin();
 	 iter != lc_thumbnail_shared.end(); ++iter)
     {
-	this->part9.push_back(objGenToIndirect(*iter));
+	this->m->part9.push_back(objGenToIndirect(*iter));
     }
     // Place outlines unless in first page
     if (! outlines_in_first_page)
     {
-	pushOutlinesToPart(this->part9, lc_outlines, object_stream_data);
+	pushOutlinesToPart(this->m->part9, lc_outlines, object_stream_data);
     }
     // Place all remaining objects
     for (std::set<QPDFObjGen>::iterator iter = lc_other.begin();
 	 iter != lc_other.end(); ++iter)
     {
-	this->part9.push_back(objGenToIndirect(*iter));
+	this->m->part9.push_back(objGenToIndirect(*iter));
     }
     // Make sure we got everything exactly once.
     unsigned int num_placed =
-        this->part4.size() + this->part6.size() + this->part7.size() +
-        this->part8.size() + this->part9.size();
-    unsigned int num_wanted = this->object_to_obj_users.size();
+        this->m->part4.size() + this->m->part6.size() + this->m->part7.size() +
+        this->m->part8.size() + this->m->part9.size();
+    unsigned int num_wanted = this->m->object_to_obj_users.size();
     if (num_placed != num_wanted)
     {
 	throw std::logic_error(
@@ -1743,28 +1746,29 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     // can map from object number only without regards to generation.
     std::map<int, int> obj_to_index;
-    this->c_shared_object_data.nshared_first_page = this->part6.size();
-    this->c_shared_object_data.nshared_total =
-	this->c_shared_object_data.nshared_first_page + this->part8.size();
+    this->m->c_shared_object_data.nshared_first_page = this->m->part6.size();
+    this->m->c_shared_object_data.nshared_total =
+	this->m->c_shared_object_data.nshared_first_page +
+        this->m->part8.size();
     std::vector<CHSharedObjectEntry>& shared =
-	this->c_shared_object_data.entries;
-    for (std::vector<QPDFObjectHandle>::iterator iter = this->part6.begin();
-	 iter != this->part6.end(); ++iter)
+	this->m->c_shared_object_data.entries;
+    for (std::vector<QPDFObjectHandle>::iterator iter = this->m->part6.begin();
+	 iter != this->m->part6.end(); ++iter)
     {
 	QPDFObjectHandle& oh = *iter;
 	int obj = oh.getObjectID();
 	obj_to_index[obj] = shared.size();
 	shared.push_back(CHSharedObjectEntry(obj));
     }
-    QTC::TC("qpdf", "QPDF lin part 8 empty", this->part8.empty() ? 1 : 0);
-    if (! this->part8.empty())
+    QTC::TC("qpdf", "QPDF lin part 8 empty", this->m->part8.empty() ? 1 : 0);
+    if (! this->m->part8.empty())
     {
-	this->c_shared_object_data.first_shared_obj =
-	    this->part8.at(0).getObjectID();
+	this->m->c_shared_object_data.first_shared_obj =
+	    this->m->part8.at(0).getObjectID();
 	for (std::vector<QPDFObjectHandle>::iterator iter =
-		 this->part8.begin();
-	     iter != this->part8.end(); ++iter)
+		 this->m->part8.begin();
+	     iter != this->m->part8.end(); ++iter)
 	{
 	    QPDFObjectHandle& oh = *iter;
 	    int obj = oh.getObjectID();
@@ -1772,8 +1776,8 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	    shared.push_back(CHSharedObjectEntry(obj));
 	}
     }
-    if (static_cast<size_t>(this->c_shared_object_data.nshared_total) !=
-        this->c_shared_object_data.entries.size())
+    if (static_cast<size_t>(this->m->c_shared_object_data.nshared_total) !=
+        this->m->c_shared_object_data.entries.size())
     {
         throw std::logic_error(
             "shared object hint table has wrong number of entries");
@@ -1784,15 +1788,15 @@ QPDF::calculateLinearizationData(std::map&lt;int, int&gt; const&amp; object_stream_data)
     for (unsigned int i = 1; i < npages; ++i)
     {
-	CHPageOffsetEntry& pe = this->c_page_offset_data.entries.at(i);
+	CHPageOffsetEntry& pe = this->m->c_page_offset_data.entries.at(i);
 	ObjUser ou(ObjUser::ou_page, i);
-	assert(this->obj_user_to_objects.count(ou) > 0);
-	std::set<QPDFObjGen> const& ogs = this->obj_user_to_objects[ou];
+	assert(this->m->obj_user_to_objects.count(ou) > 0);
+	std::set<QPDFObjGen> const& ogs = this->m->obj_user_to_objects[ou];
 	for (std::set<QPDFObjGen>::const_iterator iter = ogs.begin();
 	     iter != ogs.end(); ++iter)
 	{
 	    QPDFObjGen const& og = *iter;
-	    if ((this->object_to_obj_users[og].size() > 1) &&
+	    if ((this->m->object_to_obj_users[og].size() > 1) &&
 		(obj_to_index.count(og.getObj()) > 0))
 	    {
 		int idx = obj_to_index[og.getObj()];
@@ -1818,18 +1822,18 @@ QPDF::pushOutlinesToPart(
     outlines = getUncompressedObject(outlines, object_stream_data);
     QPDFObjGen outlines_og(outlines.getObjGen());
     QTC::TC("qpdf", "QPDF lin outlines in part",
-	    ((&part == (&this->part6)) ? 0
-	     : (&part == (&this->part9)) ? 1
+	    ((&part == (&this->m->part6)) ? 0
+	     : (&part == (&this->m->part9)) ? 1
 	     : 9999));		// can't happen
-    this->c_outline_data.first_object = outlines_og.getObj();
-    this->c_outline_data.nobjects = 1;
+    this->m->c_outline_data.first_object = outlines_og.getObj();
+    this->m->c_outline_data.nobjects = 1;
     lc_outlines.erase(outlines_og);
     part.push_back(outlines);
     for (std::set<QPDFObjGen>::iterator iter = lc_outlines.begin();
 	 iter != lc_outlines.end(); ++iter)
     {
 	part.push_back(objGenToIndirect(*iter));
-	++this->c_outline_data.nobjects;
+	++this->m->c_outline_data.nobjects;
     }
 }
@@ -1843,11 +1847,11 @@ QPDF::getLinearizedParts(
     std::vector<QPDFObjectHandle>& part9)
 {
     calculateLinearizationData(object_stream_data);
-    part4 = this->part4;
-    part6 = this->part6;
-    part7 = this->part7;
-    part8 = this->part8;
-    part9 = this->part9;
+    part4 = this->m->part4;
+    part6 = this->m->part6;
+    part7 = this->m->part7;
+    part8 = this->m->part8;
+    part9 = this->m->part9;
 }
 static inline int nbits(int val)
@@ -1889,7 +1893,7 @@ QPDF::calculateHPageOffset(
     std::vector<QPDFObjectHandle> const& pages = getAllPages();
     unsigned int npages = pages.size();
-    CHPageOffset& cph = this->c_page_offset_data;
+    CHPageOffset& cph = this->m->c_page_offset_data;
     std::vector<CHPageOffsetEntry>& cphe = cph.entries;
     // Calculate minimum and maximum values for number of objects per
@@ -1902,7 +1906,7 @@ QPDF::calculateHPageOffset(
     int max_length = min_length;
     int max_shared = cphe.at(0).nshared_objects;
-    HPageOffset& ph = this->page_offset_hints;
+    HPageOffset& ph = this->m->page_offset_hints;
     std::vector<HPageOffsetEntry>& phe = ph.entries;
     // npages is the size of the existing pages array.
     phe = std::vector<HPageOffsetEntry>(npages);
@@ -1940,7 +1944,7 @@ QPDF::calculateHPageOffset(
     ph.nbits_delta_page_length = nbits(max_length - min_length);
     ph.nbits_nshared_objects = nbits(max_shared);
     ph.nbits_shared_identifier =
-	nbits(this->c_shared_object_data.nshared_total);
+	nbits(this->m->c_shared_object_data.nshared_total);
     ph.shared_denominator = 4;	// doesn't matter
     // It isn't clear how to compute content offset and content
@@ -1975,9 +1979,9 @@ QPDF::calculateHSharedObject(
     std::map<int, qpdf_offset_t> const& lengths,
     std::map<int, int> const& obj_renumber)
 {
-    CHSharedObject& cso = this->c_shared_object_data;
+    CHSharedObject& cso = this->m->c_shared_object_data;
     std::vector<CHSharedObjectEntry>& csoe = cso.entries;
-    HSharedObject& so = this->shared_object_hints;
+    HSharedObject& so = this->m->shared_object_hints;
     std::vector<HSharedObjectEntry>& soe = so.entries;
     soe.clear();
@@ -2026,14 +2030,14 @@ QPDF::calculateHOutline(
     std::map<int, qpdf_offset_t> const& lengths,
     std::map<int, int> const& obj_renumber)
 {
-    HGeneric& cho = this->c_outline_data;
+    HGeneric& cho = this->m->c_outline_data;
     if (cho.nobjects == 0)
     {
 	return;
     }
-    HGeneric& ho = this->outline_hints;
+    HGeneric& ho = this->m->outline_hints;
     ho.first_object =
 	(*(obj_renumber.find(cho.first_object))).second;
@@ -2083,7 +2087,7 @@ write_vector_vector(BitWriter&amp; w,
 void
 QPDF::writeHPageOffset(BitWriter& w)
 {
-    HPageOffset& t = this->page_offset_hints;
+    HPageOffset& t = this->m->page_offset_hints;
     w.writeBits(t.min_nobjects, 32);			    // 1
     w.writeBits(t.first_page_offset, 32);		    // 2
@@ -2130,7 +2134,7 @@ QPDF::writeHPageOffset(BitWriter&amp; w)
 void
 QPDF::writeHSharedObject(BitWriter& w)
 {
-    HSharedObject& t = this->shared_object_hints;
+    HSharedObject& t = this->m->shared_object_hints;
     w.writeBits(t.first_shared_obj, 32);		    // 1
     w.writeBits(t.first_shared_offset, 32);		    // 2
@@ -2193,10 +2197,10 @@ QPDF::generateHintStream(std::map&lt;int, QPDFXRefEntry&gt; const&amp; xref,
     S = c.getCount();
     writeHSharedObject(w);
     O = 0;
-    if (this->outline_hints.nobjects > 0)
+    if (this->m->outline_hints.nobjects > 0)
     {
 	O = c.getCount();
-	writeHGeneric(w, this->outline_hints);
+	writeHGeneric(w, this->m->outline_hints);
     }
     c.finish();
@@ -62,7 +62,7 @@ void
 QPDF::optimize(std::map<int, int> const& object_stream_data,
 	       bool allow_changes)
 {
-    if (! this->obj_user_to_objects.empty())
+    if (! this->m->obj_user_to_objects.empty())
     {
 	// already optimized
 	return;
@@ -83,19 +83,19 @@ QPDF::optimize(std::map&lt;int, int&gt; const&amp; object_stream_data,
     }
     // Traverse pages tree pushing all inherited resources down to the
-    // page level.  This also initializes this->all_pages.
+    // page level.  This also initializes this->m->all_pages.
     pushInheritedAttributesToPage(allow_changes, false);
     // Traverse pages
-    int n = this->all_pages.size();
+    int n = this->m->all_pages.size();
     for (int pageno = 0; pageno < n; ++pageno)
     {
         updateObjectMaps(ObjUser(ObjUser::ou_page, pageno),
-                         this->all_pages.at(pageno));
+                         this->m->all_pages.at(pageno));
     }
     // Traverse document-level items
-    std::set<std::string> keys = this->trailer.getKeys();
+    std::set<std::string> keys = this->m->trailer.getKeys();
     for (std::set<std::string>::iterator iter = keys.begin();
 	 iter != keys.end(); ++iter)
     {
@@ -107,7 +107,7 @@ QPDF::optimize(std::map&lt;int, int&gt; const&amp; object_stream_data,
 	else
 	{
 	    updateObjectMaps(ObjUser(ObjUser::ou_trailer_key, key),
-			     this->trailer.getKey(key));
+			     this->m->trailer.getKey(key));
 	}
     }
@@ -129,8 +129,8 @@ QPDF::optimize(std::map&lt;int, int&gt; const&amp; object_stream_data,
     ObjUser root_ou = ObjUser(ObjUser::ou_root);
     QPDFObjGen root_og = QPDFObjGen(root.getObjGen());
-    obj_user_to_objects[root_ou].insert(root_og);
-    object_to_obj_users[root_og].insert(root_ou);
+    this->m->obj_user_to_objects[root_ou].insert(root_og);
+    this->m->object_to_obj_users[root_og].insert(root_ou);
     filterCompressedObjects(object_stream_data);
 }
@@ -151,7 +151,7 @@ QPDF::pushInheritedAttributesToPage(bool allow_changes, bool warn_skipped_keys)
     // The record of whether we've done this is cleared by
     // updateAllPagesCache().  If we're warning for skipped keys,
     // re-traverse unconditionally.
-    if (this->pushed_inherited_attributes_to_pages && (! warn_skipped_keys))
+    if (this->m->pushed_inherited_attributes_to_pages && (! warn_skipped_keys))
     {
         return;
     }
@@ -159,12 +159,12 @@ QPDF::pushInheritedAttributesToPage(bool allow_changes, bool warn_skipped_keys)
     // key_ancestors is a mapping of page attribute keys to a stack of
     // Pages nodes that contain values for them.
     std::map<std::string, std::vector<QPDFObjectHandle> > key_ancestors;
-    this->all_pages.clear();
+    this->m->all_pages.clear();
     pushInheritedAttributesToPageInternal(
-        this->trailer.getKey("/Root").getKey("/Pages"),
-        key_ancestors, this->all_pages, allow_changes, warn_skipped_keys);
+        this->m->trailer.getKey("/Root").getKey("/Pages"),
+        key_ancestors, this->m->all_pages, allow_changes, warn_skipped_keys);
     assert(key_ancestors.empty());
-    this->pushed_inherited_attributes_to_pages = true;
+    this->m->pushed_inherited_attributes_to_pages = true;
 }
 void
@@ -192,8 +192,8 @@ QPDF::pushInheritedAttributesToPageInternal2(
     if (visited.count(this_og) > 0)
     {
         throw QPDFExc(
-            qpdf_e_pages, this->file->getName(),
-            this->last_object_description, 0,
+            qpdf_e_pages, this->m->file->getName(),
+            this->m->last_object_description, 0,
             "Loop detected in /Pages structure (inherited attributes)");
     }
     visited.insert(this_og);
@@ -219,9 +219,9 @@ QPDF::pushInheritedAttributesToPageInternal2(
 	    {
 		if (! allow_changes)
 		{
-		    throw QPDFExc(qpdf_e_internal, this->file->getName(),
-				  this->last_object_description,
-				  this->file->getLastOffset(),
+		    throw QPDFExc(qpdf_e_internal, this->m->file->getName(),
+				  this->m->last_object_description,
+				  this->m->file->getLastOffset(),
 				  "optimize detected an "
                                   "inheritable attribute when called "
 				  "in no-change mode");
@@ -269,8 +269,8 @@ QPDF::pushInheritedAttributesToPageInternal2(
                     setLastObjectDescription("Pages object",
                                              cur_pages.getObjectID(),
                                              cur_pages.getGeneration());
-                    warn(QPDFExc(qpdf_e_pages, this->file->getName(),
-                                 this->last_object_description, 0,
+                    warn(QPDFExc(qpdf_e_pages, this->m->file->getName(),
+                                 this->m->last_object_description, 0,
                                  "Unknown key " + key + " in /Pages object"
                                  " is being discarded as a result of"
                                  " flattening the /Pages tree"));
@@ -337,9 +337,9 @@ QPDF::pushInheritedAttributesToPageInternal2(
     }
     else
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "invalid Type " + type + " in page tree");
     }
     visited.erase(this_og);
@@ -382,8 +382,8 @@ QPDF::updateObjectMapsInternal(ObjUser const&amp; ou, QPDFObjectHandle oh,
 	    QTC::TC("qpdf", "QPDF opt loop detected");
 	    return;
 	}
-	this->obj_user_to_objects[ou].insert(og);
-	this->object_to_obj_users[og].insert(ou);
+	this->m->obj_user_to_objects[ou].insert(og);
+	this->m->object_to_obj_users[og].insert(ou);
 	visited.insert(og);
     }
@@ -445,8 +445,8 @@ QPDF::filterCompressedObjects(std::map&lt;int, int&gt; const&amp; object_stream_data)
     std::map<QPDFObjGen, std::set<ObjUser> > t_object_to_obj_users;
     for (std::map<ObjUser, std::set<QPDFObjGen> >::iterator i1 =
-	     this->obj_user_to_objects.begin();
-	 i1 != this->obj_user_to_objects.end(); ++i1)
+	     this->m->obj_user_to_objects.begin();
+	 i1 != this->m->obj_user_to_objects.end(); ++i1)
     {
 	ObjUser const& ou = (*i1).first;
 	std::set<QPDFObjGen> const& objects = (*i1).second;
@@ -468,8 +468,8 @@ QPDF::filterCompressedObjects(std::map&lt;int, int&gt; const&amp; object_stream_data)
     }
     for (std::map<QPDFObjGen, std::set<ObjUser> >::iterator i1 =
-	     this->object_to_obj_users.begin();
-	 i1 != this->object_to_obj_users.end(); ++i1)
+	     this->m->object_to_obj_users.begin();
+	 i1 != this->m->object_to_obj_users.end(); ++i1)
     {
 	QPDFObjGen const& og = (*i1).first;
 	std::set<ObjUser> const& objusers = (*i1).second;
@@ -490,6 +490,6 @@ QPDF::filterCompressedObjects(std::map&lt;int, int&gt; const&amp; object_stream_data)
 	}
     }
-    this->obj_user_to_objects = t_obj_user_to_objects;
-    this->object_to_obj_users = t_object_to_obj_users;
+    this->m->obj_user_to_objects = t_obj_user_to_objects;
+    this->m->object_to_obj_users = t_object_to_obj_users;
 }
@@ -44,12 +44,12 @@ std::vector&lt;QPDFObjectHandle&gt; const&amp;
 QPDF::getAllPages()
 {
     // Note that pushInheritedAttributesToPage may also be used to
-    // initialize this->all_pages.
-    if (this->all_pages.empty())
+    // initialize this->m->all_pages.
+    if (this->m->all_pages.empty())
     {
-	getAllPagesInternal(getRoot().getKey("/Pages"), this->all_pages);
+	getAllPagesInternal(getRoot().getKey("/Pages"), this->m->all_pages);
     }
-    return this->all_pages;
+    return this->m->all_pages;
 }
 void
@@ -69,8 +69,8 @@ QPDF::getAllPagesInternal2(QPDFObjectHandle cur_pages,
     if (visited.count(this_og) > 0)
     {
         throw QPDFExc(
-            qpdf_e_pages, this->file->getName(),
-            this->last_object_description, 0,
+            qpdf_e_pages, this->m->file->getName(),
+            this->m->last_object_description, 0,
             "Loop detected in /Pages structure (getAllPages)");
     }
     visited.insert(this_og);
@@ -103,9 +103,9 @@ QPDF::getAllPagesInternal2(QPDFObjectHandle cur_pages,
     }
     else
     {
-	throw QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
-		      this->last_object_description,
-		      this->file->getLastOffset(),
+	throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(),
+		      this->m->last_object_description,
+		      this->m->file->getLastOffset(),
 		      "invalid Type " + type + " in page tree");
     }
     visited.erase(this_og);
@@ -119,9 +119,9 @@ QPDF::updateAllPagesCache()
     // it that they got from calls to getAllPages().  We can defer
     // recalculation of pageobj_to_pages_pos until needed.
     QTC::TC("qpdf", "QPDF updateAllPagesCache");
-    this->all_pages.clear();
-    this->pageobj_to_pages_pos.clear();
-    this->pushed_inherited_attributes_to_pages = false;
+    this->m->all_pages.clear();
+    this->m->pageobj_to_pages_pos.clear();
+    this->m->pushed_inherited_attributes_to_pages = false;
     getAllPages();
 }
@@ -131,26 +131,26 @@ QPDF::flattenPagesTree()
     // If not already done, flatten the /Pages structure and
     // initialize pageobj_to_pages_pos.
-    if (! this->pageobj_to_pages_pos.empty())
+    if (! this->m->pageobj_to_pages_pos.empty())
     {
         return;
     }
     // Push inherited objects down to the /Page level.  As a side
-    // effect this->all_pages will also be generated.
+    // effect this->m->all_pages will also be generated.
     pushInheritedAttributesToPage(true, true);
     QPDFObjectHandle pages = getRoot().getKey("/Pages");
-    int const len = this->all_pages.size();
+    int const len = this->m->all_pages.size();
     for (int pos = 0; pos < len; ++pos)
     {
         // populate pageobj_to_pages_pos and fix parent pointer
-        insertPageobjToPage(this->all_pages.at(pos), pos, true);
-        this->all_pages.at(pos).replaceKey("/Parent", pages);
+        insertPageobjToPage(this->m->all_pages.at(pos), pos, true);
+        this->m->all_pages.at(pos).replaceKey("/Parent", pages);
     }
-    pages.replaceKey("/Kids", QPDFObjectHandle::newArray(this->all_pages));
+    pages.replaceKey("/Kids", QPDFObjectHandle::newArray(this->m->all_pages));
     // /Count has not changed
     if (pages.getKey("/Count").getIntValue() != len)
     {
@@ -165,21 +165,22 @@ QPDF::insertPageobjToPage(QPDFObjectHandle const&amp; obj, int pos,
     QPDFObjGen og(obj.getObjGen());
     if (check_duplicate)
     {
-        if (! this->pageobj_to_pages_pos.insert(std::make_pair(og, pos)).second)
+        if (! this->m->pageobj_to_pages_pos.insert(
+                std::make_pair(og, pos)).second)
         {
             QTC::TC("qpdf", "QPDF duplicate page reference");
             setLastObjectDescription("page " + QUtil::int_to_string(pos) +
                                      " (numbered from zero)",
                                      og.getObj(), og.getGen());
-            throw QPDFExc(qpdf_e_pages, this->file->getName(),
-                          this->last_object_description, 0,
+            throw QPDFExc(qpdf_e_pages, this->m->file->getName(),
+                          this->m->last_object_description, 0,
                           "duplicate page reference found;"
                           " this would cause loss of data");
         }
     }
     else
     {
-        this->pageobj_to_pages_pos[og] = pos;
+        this->m->pageobj_to_pages_pos[og] = pos;
     }
 }
@@ -195,13 +196,13 @@ QPDF::insertPage(QPDFObjectHandle newpage, int pos)
     if (! newpage.isIndirect())
     {
         QTC::TC("qpdf", "QPDF insert non-indirect page");
-        newpage = this->makeIndirectObject(newpage);
+        newpage = makeIndirectObject(newpage);
     }
     else if (newpage.getOwningQPDF() != this)
     {
         QTC::TC("qpdf", "QPDF insert foreign page");
         newpage.getOwningQPDF()->pushInheritedAttributesToPage();
-        newpage = this->copyForeignObject(newpage, true);
+        newpage = copyForeignObject(newpage, true);
     }
     else
     {
@@ -210,26 +211,26 @@ QPDF::insertPage(QPDFObjectHandle newpage, int pos)
     QTC::TC("qpdf", "QPDF insert page",
             (pos == 0) ? 0 :                      // insert at beginning
-            (pos == static_cast<int>(this->all_pages.size())) ? 1 : // at end
+            (pos == static_cast<int>(this->m->all_pages.size())) ? 1 : // at end
             2);                                   // insert in middle
     QPDFObjectHandle pages = getRoot().getKey("/Pages");
     QPDFObjectHandle kids = pages.getKey("/Kids");
     assert ((pos >= 0) &&
-            (static_cast<size_t>(pos) <= this->all_pages.size()));
+            (static_cast<size_t>(pos) <= this->m->all_pages.size()));
     newpage.replaceKey("/Parent", pages);
     kids.insertItem(pos, newpage);
     int npages = kids.getArrayNItems();
     pages.replaceKey("/Count", QPDFObjectHandle::newInteger(npages));
-    this->all_pages.insert(this->all_pages.begin() + pos, newpage);
-    assert(this->all_pages.size() == static_cast<size_t>(npages));
+    this->m->all_pages.insert(this->m->all_pages.begin() + pos, newpage);
+    assert(this->m->all_pages.size() == static_cast<size_t>(npages));
     for (int i = pos + 1; i < npages; ++i)
     {
-        insertPageobjToPage(this->all_pages.at(i), i, false);
+        insertPageobjToPage(this->m->all_pages.at(i), i, false);
     }
     insertPageobjToPage(newpage, pos, true);
-    assert(this->pageobj_to_pages_pos.size() == static_cast<size_t>(npages));
+    assert(this->m->pageobj_to_pages_pos.size() == static_cast<size_t>(npages));
 }
 void
@@ -238,7 +239,8 @@ QPDF::removePage(QPDFObjectHandle page)
     int pos = findPage(page); // also ensures flat /Pages
     QTC::TC("qpdf", "QPDF remove page",
             (pos == 0) ? 0 :                            // remove at beginning
-            (pos == static_cast<int>(this->all_pages.size() - 1)) ? 1 : // end
+            (pos == static_cast<int>(
+                this->m->all_pages.size() - 1)) ? 1 :   // end
             2);                                         // remove in middle
     QPDFObjectHandle pages = getRoot().getKey("/Pages");
@@ -247,13 +249,13 @@ QPDF::removePage(QPDFObjectHandle page)
     kids.eraseItem(pos);
     int npages = kids.getArrayNItems();
     pages.replaceKey("/Count", QPDFObjectHandle::newInteger(npages));
-    this->all_pages.erase(this->all_pages.begin() + pos);
-    assert(this->all_pages.size() == static_cast<size_t>(npages));
-    this->pageobj_to_pages_pos.erase(page.getObjGen());
-    assert(this->pageobj_to_pages_pos.size() == static_cast<size_t>(npages));
+    this->m->all_pages.erase(this->m->all_pages.begin() + pos);
+    assert(this->m->all_pages.size() == static_cast<size_t>(npages));
+    this->m->pageobj_to_pages_pos.erase(page.getObjGen());
+    assert(this->m->pageobj_to_pages_pos.size() == static_cast<size_t>(npages));
     for (int i = pos; i < npages; ++i)
     {
-        insertPageobjToPage(this->all_pages.at(i), i, false);
+        insertPageobjToPage(this->m->all_pages.at(i), i, false);
     }
 }
@@ -295,12 +297,12 @@ QPDF::findPage(QPDFObjGen const&amp; og)
 {
     flattenPagesTree();
     std::map<QPDFObjGen, int>::iterator it =
-        this->pageobj_to_pages_pos.find(og);
-    if (it == this->pageobj_to_pages_pos.end())
+        this->m->pageobj_to_pages_pos.find(og);
+    if (it == this->m->pageobj_to_pages_pos.end())
     {
         setLastObjectDescription("page object", og.getObj(), og.getGen());
-        throw QPDFExc(qpdf_e_pages, this->file->getName(),
-                      this->last_object_description, 0,
+        throw QPDFExc(qpdf_e_pages, this->m->file->getName(),
+                      this->m->last_object_description, 0,
                       "page object not referenced in /Pages tree");
     }
     return (*it).second;