Merge pull request #1171 from m-holger/unresolved

Refactor the creation of unresolved objects

Merge pull request #1171 from m-holger/unresolved
Refactor the creation of unresolved objects
m-holger · GitHub
2 parents 77d1a0cf 08eb6844
Showing 29 changed files with 231 additions and 251 deletions
fuzz/CMakeLists.txt
fuzz/qpdf_extra/70306a.fuzz
fuzz/qpdf_extra/70306b.fuzz
fuzz/qtest/fuzz.test
include/qpdf/QPDF.hh
libqpdf/QPDF.cc
libqpdf/QPDFObjectHandle.cc
libqpdf/QPDFOutlineDocumentHelper.cc
libqpdf/QPDFParser.cc
libqpdf/QPDFWriter.cc
libqpdf/QPDF_Null.cc
libqpdf/QPDF_json.cc
libqpdf/qpdf/QPDFParser.hh
libqpdf/qpdf/QPDF_Null.hh
libqpdf/qpdf/qpdf-c_impl.hh
libtests/sparse_array.cc
qpdf/qpdf.testcov
qpdf/qtest/qpdf/dangling-bad-xref-dangling-out.pdf
qpdf/qtest/qpdf/dangling-bad-xref-dangling.out
qpdf/qtest/qpdf/dangling-refs-dangling-out.pdf
@@ -133,6 +133,8 @@ set(CORPUS_OTHER
   70055.fuzz
   70245.fuzz
   70306.fuzz
+  70306a.fuzz
+  70306b.fuzz
 )
 set(CORPUS_DIR ${CMAKE_CURRENT_BINARY_DIR}/qpdf_corpus)
@@ -21,7 +21,7 @@ my @fuzzers = (
     ['pngpredictor' => 1],
     ['runlength' => 6],
     ['tiffpredictor' => 2],
-    ['qpdf' => 75],             # increment when adding new files
+    ['qpdf' => 77],             # increment when adding new files
     );
 my $n_tests = 0;
@@ -819,7 +819,8 @@ class QPDF
         }
     };
-    // The ParseGuard class allows QPDFParser to detect re-entrant parsing.
+    // The ParseGuard class allows QPDFParser to detect re-entrant parsing. It also provides
+    // special access to allow the parser to create unresolved objects and dangling references.
     class ParseGuard
     {
         friend class QPDFParser;
@@ -832,6 +833,13 @@ class QPDF
                 qpdf->inParse(true);
             }
         }
+
+        static std::shared_ptr<QPDFObject>
+        getObject(QPDF* qpdf, int id, int gen, bool parse_pdf)
+        {
+            return qpdf->getObjectForParser(id, gen, parse_pdf);
+        }
+
         ~ParseGuard()
         {
             if (qpdf) {
@@ -900,8 +908,8 @@ class QPDF
         }
         ObjCache(
             std::shared_ptr<QPDFObject> object,
-            qpdf_offset_t end_before_space,
-            qpdf_offset_t end_after_space) :
+            qpdf_offset_t end_before_space = 0,
+            qpdf_offset_t end_after_space = 0) :
             object(object),
             end_before_space(end_before_space),
             end_after_space(end_after_space)
@@ -1065,13 +1073,14 @@ class QPDF
     QPDFObject* resolve(QPDFObjGen og);
     void resolveObjectsInStream(int obj_stream_number);
     void stopOnError(std::string const& message);
-    QPDFObjectHandle reserveObjectIfNotExists(QPDFObjGen const& og);
     QPDFObjectHandle reserveStream(QPDFObjGen const& og);
     QPDFObjGen nextObjGen();
     QPDFObjectHandle newIndirect(QPDFObjGen const&, std::shared_ptr<QPDFObject> const&);
     QPDFObjectHandle makeIndirectFromQPDFObject(std::shared_ptr<QPDFObject> const& obj);
     bool isCached(QPDFObjGen const& og);
     bool isUnresolved(QPDFObjGen const& og);
+    std::shared_ptr<QPDFObject> getObjectForParser(int id, int gen, bool parse_pdf);
+    std::shared_ptr<QPDFObject> getObjectForJSON(int id, int gen);
     void removeObject(QPDFObjGen og);
     void updateCache(
         QPDFObjGen const& og,
@@ -654,9 +654,11 @@ QPDF::reconstruct_xref(QPDFExc&amp; e)
     }
     check_warnings();
     if (!m->parsed) {
+        m->parsed = true;
         getAllPages();
         check_warnings();
         if (m->all_pages.empty()) {
+            m->parsed = false;
             throw damagedPDF("", 0, "unable to find any pages while recovering damaged file");
         }
     }
@@ -1462,7 +1464,8 @@ QPDF::readTrailer()
 {
     qpdf_offset_t offset = m->file->tell();
     bool empty = false;
-    auto object = QPDFParser(m->file, "trailer", m->tokenizer, nullptr, this).parse(empty, false);
+    auto object =
+        QPDFParser(m->file, "trailer", m->tokenizer, nullptr, this, true).parse(empty, false);
     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.
@@ -1484,8 +1487,9 @@ QPDF::readObject(std::string const&amp; description, QPDFObjGen og)
     StringDecrypter decrypter{this, og};
     StringDecrypter* decrypter_ptr = m->encp->encrypted ? &decrypter : nullptr;
-    auto object = QPDFParser(m->file, m->last_object_description, m->tokenizer, decrypter_ptr, this)
-                      .parse(empty, false);
+    auto object =
+        QPDFParser(m->file, m->last_object_description, m->tokenizer, decrypter_ptr, this, true)
+            .parse(empty, false);
     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.
@@ -1604,7 +1608,7 @@ QPDF::readObjectInStream(std::shared_ptr&lt;InputSource&gt;&amp; input, int obj)
     m->last_object_description += " 0";
     bool empty = false;
-    auto object = QPDFParser(input, m->last_object_description, m->tokenizer, nullptr, this)
+    auto object = QPDFParser(input, m->last_object_description, m->tokenizer, nullptr, this, true)
                       .parse(empty, false);
     if (empty) {
         // Nothing in the PDF spec appears to allow empty objects, but they have been encountered in
@@ -2094,30 +2098,52 @@ QPDF::newStream(std::string const&amp; data)
 }
 QPDFObjectHandle
-QPDF::reserveObjectIfNotExists(QPDFObjGen const& og)
+QPDF::reserveStream(QPDFObjGen const& og)
 {
-    if (!isCached(og) && m->xref_table.count(og) == 0) {
-        updateCache(og, QPDF_Reserved::create(), -1, -1);
-        return newIndirect(og, m->obj_cache[og].object);
-    } else {
-        return getObject(og);
+    return {QPDF_Stream::create(this, og, QPDFObjectHandle::newDictionary(), 0, 0)};
+}
+
+std::shared_ptr<QPDFObject>
+QPDF::getObjectForParser(int id, int gen, bool parse_pdf)
+{
+    // This method is called by the parser and therefore must not resolve any objects.
+    auto og = QPDFObjGen(id, gen);
+    if (auto iter = m->obj_cache.find(og); iter != m->obj_cache.end()) {
+        return iter->second.object;
     }
+    if (m->xref_table.count(og) || !m->parsed) {
+        return m->obj_cache.insert({og, QPDF_Unresolved::create(this, og)}).first->second.object;
+    }
+    if (parse_pdf) {
+        return QPDF_Null::create();
+    }
+    return m->obj_cache.insert({og, QPDF_Null::create(this, og)}).first->second.object;
 }
-QPDFObjectHandle
-QPDF::reserveStream(QPDFObjGen const& og)
+std::shared_ptr<QPDFObject>
+QPDF::getObjectForJSON(int id, int gen)
 {
-    return {QPDF_Stream::create(this, og, QPDFObjectHandle::newDictionary(), 0, 0)};
+    auto og = QPDFObjGen(id, gen);
+    auto [it, inserted] = m->obj_cache.try_emplace(og);
+    auto& obj = it->second.object;
+    if (inserted) {
+        obj = (m->parsed && !m->xref_table.count(og)) ? QPDF_Null::create(this, og)
+                                                      : QPDF_Unresolved::create(this, og);
+    }
+    return obj;
 }
 QPDFObjectHandle
 QPDF::getObject(QPDFObjGen const& og)
 {
-    // This method is called by the parser and therefore must not resolve any objects.
-    if (!isCached(og)) {
-        m->obj_cache[og] = ObjCache(QPDF_Unresolved::create(this, og), -1, -1);
+    if (auto it = m->obj_cache.find(og); it != m->obj_cache.end()) {
+        return {it->second.object};
+    } else if (m->parsed && !m->xref_table.count(og)) {
+        return QPDF_Null::create();
+    } else {
+        auto result = m->obj_cache.try_emplace(og, QPDF_Unresolved::create(this, og), -1, -1);
+        return {result.first->second.object};
     }
-    return newIndirect(og, m->obj_cache[og].object);
 }
 QPDFObjectHandle
@@ -2146,7 +2146,8 @@ QPDFObjectHandle::parseContentStream_data(
         tokenizer.readToken(input, "content", true);
         qpdf_offset_t offset = input->getLastOffset();
         input->seek(offset, SEEK_SET);
-        auto obj = QPDFParser(input, "content", tokenizer, nullptr, context).parse(empty, true);
+        auto obj =
+            QPDFParser(input, "content", tokenizer, nullptr, context, false).parse(empty, true);
         if (!obj.isInitialized()) {
             // EOF
             break;
@@ -2205,7 +2206,8 @@ QPDFObjectHandle::parse(
     StringDecrypter* decrypter,
     QPDF* context)
 {
-    return QPDFParser(input, object_description, tokenizer, decrypter, context).parse(empty, false);
+    return QPDFParser(input, object_description, tokenizer, decrypter, context, false)
+        .parse(empty, false);
 }
 #ifndef QPDF_FUTURE
@@ -71,7 +71,7 @@ QPDFOutlineDocumentHelper::resolveNamedDest(QPDFObjectHandle name)
             m->dest_dict = qpdf.getRoot().getKey("/Dests");
         }
         QTC::TC("qpdf", "QPDFOutlineDocumentHelper name named dest");
-        result=  m->dest_dict.getKeyIfDict(name.getName());
+        result = m->dest_dict.getKeyIfDict(name.getName());
     } else if (name.isString()) {
         if (!m->names_dest) {
             auto dests = qpdf.getRoot().getKey("/Names").getKeyIfDict("/Dests");
@@ -166,10 +166,7 @@ QPDFParser::parseRemainder(bool content_stream)
                 auto id = QIntC::to_int(int_buffer[(int_count - 1) % 2]);
                 auto gen = QIntC::to_int(int_buffer[(int_count) % 2]);
                 if (!(id < 1 || gen < 0 || gen >= 65535)) {
-                    // This action has the desirable side effect of causing dangling references
-                    // (references to indirect objects that don't appear in the PDF) in any parsed
-                    // object to appear in the object cache.
-                    add(std::move(context->getObject(id, gen).obj));
+                    add(QPDF::ParseGuard::getObject(context, id, gen, parse_pdf));
                 } else {
                     QTC::TC("qpdf", "QPDFParser invalid objgen");
                     addNull();
@@ -1237,7 +1237,7 @@ bool
 QPDFWriter::willFilterStream(
     QPDFObjectHandle stream,
     bool& compress_stream, // out only
-    bool& is_metadata, // out only
+    bool& is_metadata,     // out only
     std::shared_ptr<Buffer>* stream_data)
 {
     compress_stream = false;
@@ -3,15 +3,15 @@
 #include <qpdf/JSON_writer.hh>
 #include <qpdf/QPDFObject_private.hh>
-QPDF_Null::QPDF_Null() :
-    QPDFValue(::ot_null, "null")
+QPDF_Null::QPDF_Null(QPDF* qpdf, QPDFObjGen og) :
+    QPDFValue(::ot_null, "null", qpdf, og)
 {
 }
 std::shared_ptr<QPDFObject>
-QPDF_Null::create()
+QPDF_Null::create(QPDF* qpdf, QPDFObjGen og)
 {
-    return do_create(new QPDF_Null());
+    return do_create(new QPDF_Null(qpdf, og));
 }
 std::shared_ptr<QPDFObject>
@@ -240,11 +240,6 @@ class QPDF::JSONReactor: public JSON::Reactor
         descr(std::make_shared<QPDFValue::Description>(
             QPDFValue::JSON_Descr(std::make_shared<std::string>(is->getName()), "")))
     {
-        for (auto& oc: pdf.m->obj_cache) {
-            if (oc.second.object->getTypeCode() == ::ot_reserved) {
-                reserved.insert(oc.first);
-            }
-        }
     }
     ~JSONReactor() override = default;
     void dictionaryStart() override;
@@ -272,10 +267,10 @@ class QPDF::JSONReactor: public JSON::Reactor
     struct StackFrame
     {
         StackFrame(state_e state) :
-            state(state){};
+            state(state) {};
         StackFrame(state_e state, QPDFObjectHandle&& object) :
             state(state),
-            object(object){};
+            object(object) {};
         state_e state;
         QPDFObjectHandle object;
     };
@@ -305,7 +300,6 @@ class QPDF::JSONReactor: public JSON::Reactor
     bool saw_data{false};
     bool saw_datafile{false};
     bool this_stream_needs_data{false};
-    std::set<QPDFObjGen> reserved;
     std::vector<StackFrame> stack;
     QPDFObjectHandle next_obj;
     state_e next_state{st_top};
@@ -416,16 +410,6 @@ QPDF::JSONReactor::containerEnd(JSON const&amp; value)
                 }
             }
         }
-    } else if (from_state == st_qpdf) {
-        // Handle dangling indirect object references which the PDF spec says to treat as nulls.
-        // It's tempting to make this an error, but that would be wrong since valid input files may
-        // have these.
-        for (auto& oc: pdf.m->obj_cache) {
-            if (oc.second.object->getTypeCode() == ::ot_reserved && reserved.count(oc.first) == 0) {
-                QTC::TC("qpdf", "QPDF_json non-trivial null reserved");
-                pdf.updateCache(oc.first, QPDF_Null::create(), -1, -1);
-            }
-        }
     }
     if (!stack.empty()) {
         auto state = stack.back().state;
@@ -565,7 +549,7 @@ QPDF::JSONReactor::dictionaryItem(std::string const&amp; key, JSON const&amp; value)
         } else if (is_obj_key(key, obj, gen)) {
             this->cur_object = key;
             if (setNextStateIfDictionary(key, value, st_object_top)) {
-                next_obj = pdf.reserveObjectIfNotExists(QPDFObjGen(obj, gen));
+                next_obj = pdf.getObjectForJSON(obj, gen);
             }
         } else {
             QTC::TC("qpdf", "QPDF_json bad object key");
@@ -767,7 +751,7 @@ QPDF::JSONReactor::makeObject(JSON const&amp; value)
         int gen = 0;
         std::string str;
         if (is_indirect_object(str_v, obj, gen)) {
-            result = pdf.reserveObjectIfNotExists(QPDFObjGen(obj, gen));
+            result = pdf.getObjectForJSON(obj, gen);
         } else if (is_unicode_string(str_v, str)) {
             result = QPDFObjectHandle::newUnicodeString(str);
         } else if (is_binary_string(str_v, str)) {
@@ -16,14 +16,16 @@ class QPDFParser
         std::string const& object_description,
         QPDFTokenizer& tokenizer,
         QPDFObjectHandle::StringDecrypter* decrypter,
-        QPDF* context) :
+        QPDF* context,
+        bool parse_pdf) :
         input(input),
         object_description(object_description),
         tokenizer(tokenizer),
         decrypter(decrypter),
         context(context),
         description(std::make_shared<QPDFValue::Description>(
-            std::string(input->getName() + ", " + object_description + " at offset $PO")))
+            std::string(input->getName() + ", " + object_description + " at offset $PO"))),
+        parse_pdf(parse_pdf)
     {
     }
     virtual ~QPDFParser() = default;
@@ -76,6 +78,8 @@ class QPDFParser
     QPDFObjectHandle::StringDecrypter* decrypter;
     QPDF* context;
     std::shared_ptr<QPDFValue::Description> description;
+    bool parse_pdf;
+
     std::vector<StackFrame> stack;
     StackFrame* frame;
     // Number of recent bad tokens.
@@ -7,7 +7,7 @@ class QPDF_Null: public QPDFValue
 {
   public:
     ~QPDF_Null() override = default;
-    static std::shared_ptr<QPDFObject> create();
+    static std::shared_ptr<QPDFObject> create(QPDF* qpdf = nullptr, QPDFObjGen og = QPDFObjGen());
     static std::shared_ptr<QPDFObject> create(
         std::shared_ptr<QPDFObject> parent,
         std::string_view const& static_descr,
@@ -21,7 +21,7 @@ class QPDF_Null: public QPDFValue
     void writeJSON(int json_version, JSON::Writer& p) override;
   private:
-    QPDF_Null();
+    QPDF_Null(QPDF* qpdf = nullptr, QPDFObjGen og = QPDFObjGen());
 };
 #endif // QPDF_NULL_HH
@@ -16,7 +16,7 @@ struct _qpdf_data
     _qpdf_data() = default;
     _qpdf_data(std::unique_ptr<QPDF>&& qpdf) :
-        qpdf(std::move(qpdf)){};
+        qpdf(std::move(qpdf)) {};
     ~_qpdf_data() = default;
@@ -90,17 +90,17 @@ main()
     obj = QPDF_Array::create({10, "null"_qpdf.getObj()}, true);
     QPDF_Array& b = *obj->as<QPDF_Array>();
-    b.setAt(5, pdf.getObject(5, 0));
+    b.setAt(5, pdf.newIndirectNull());
     b.setAt(7, "[0 1 2 3]"_qpdf);
     assert(b.at(3).isNull());
     assert(b.at(8).isNull());
     assert(b.at(5).isIndirect());
-    assert(b.unparse() == "[ null null null null null 5 0 R null [ 0 1 2 3 ] null null ]");
+    assert(b.unparse() == "[ null null null null null 3 0 R null [ 0 1 2 3 ] null null ]");
     auto c = b.copy(true);
     auto d = b.copy(false);
     b.at(7).setArrayItem(2, "42"_qpdf);
-    assert(c->unparse() == "[ null null null null null 5 0 R null [ 0 1 42 3 ] null null ]");
-    assert(d->unparse() == "[ null null null null null 5 0 R null [ 0 1 2 3 ] null null ]");
+    assert(c->unparse() == "[ null null null null null 3 0 R null [ 0 1 42 3 ] null null ]");
+    assert(d->unparse() == "[ null null null null null 3 0 R null [ 0 1 2 3 ] null null ]");
     try {
         b.setAt(3, {});
@@ -675,7 +675,6 @@ QPDF_json ignore second-level key 0
 QPDF_json ignore unknown key in object_top 0
 QPDF_json ignore unknown key in trailer 0
 QPDF_json ignore unknown key in stream 0
-QPDF_json non-trivial null reserved 0
 QPDF_json data and datafile 0
 QPDF_json no stream data in update mode 0
 QPDF_json updating existing stream 0
 WARNING: dangling-bad-xref.pdf: file is damaged
 WARNING: dangling-bad-xref.pdf (object 7 0, offset 10000): expected n n obj
 WARNING: dangling-bad-xref.pdf: Attempting to reconstruct cross-reference table
-new object: 13 0 R
+new object: 12 0 R
 all objects
 1 0 R
 2 0 R
@@ -10,10 +10,6 @@ all objects
 5 0 R
 6 0 R
 7 0 R
-8 0 R
-9 0 R
-10 0 R
 11 0 R
 12 0 R
-13 0 R
 test 53 done
-new object: 11 0 R
+new object: 8 0 R
 all objects
 1 0 R
 2 0 R
@@ -8,7 +8,4 @@ all objects
 6 0 R
 7 0 R
 8 0 R
-9 0 R
-10 0 R
-11 0 R
 test 53 done
@@ -7,5 +7,5 @@
   /nesting is direct
   /strings is direct
 unparse: 7 0 R
-unparseResolved: << /dangling-ref-for-json-test [ 9 0 R ] /hex#20strings [ (Potato) <01020300040560> (AB) ] /indirect 8 0 R /names [ /nesting /hex#20strings /text#2fplain ] /nesting << /a [ 1 2 << /x (y) >> [ (z) ] ] /b << / (legal) /a [ 1 2 ] >> >> /strings [ (one) <24a2> () (\(\)) (\() (\)) (a\f\b\t\r\nb) (") ("") ("\("\)") <410042> (a\nb) (a b) <efbbbfcf80> <efbbbff09fa594> ] >>
+unparseResolved: << /dangling-ref-for-json-test [ null ] /hex#20strings [ (Potato) <01020300040560> (AB) ] /indirect 8 0 R /names [ /nesting /hex#20strings /text#2fplain ] /nesting << /a [ 1 2 << /x (y) >> [ (z) ] ] /b << / (legal) /a [ 1 2 ] >> >> /strings [ (one) <24a2> () (\(\)) (\() (\)) (a\f\b\t\r\nb) (") ("") ("\("\)") <410042> (a\nb) (a b) <efbbbfcf80> <efbbbff09fa594> ] >>
 test 1 done
@@ -14,14 +14,14 @@ endobj
 2 0 obj
 <<
   /dangling-ref-for-json-test [
-    4 0 R
+    null
   ]
   /hex#20strings [
     (Potato)
     <01020300040560>
     (AB)
   ]
-  /indirect 5 0 R
+  /indirect 4 0 R
   /names [
     /nesting
     /hex#20strings
@@ -71,27 +71,22 @@ endobj
 <<
   /Count 1
   /Kids [
-    6 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
 endobj
-%% Original object ID: 9 0
-4 0 obj
-null
-endobj
-
 %% Original object ID: 8 0
-5 0 obj
+4 0 obj
 (hello)
 endobj
 %% Page 1
 %% Original object ID: 3 0
-6 0 obj
+5 0 obj
 <<
-  /Contents 7 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -101,9 +96,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 9 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 10 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -111,9 +106,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-7 0 obj
+6 0 obj
 <<
-  /Length 8 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -124,12 +119,12 @@ ET
 endstream
 endobj
-8 0 obj
+7 0 obj
 44
 endobj
 %% Original object ID: 6 0
-9 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -140,7 +135,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-10 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -148,24 +143,23 @@ endobj
 endobj
 xref
-0 11
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000756 00000 n 
-0000000855 00000 n 
-0000000903 00000 n 
-0000000964 00000 n 
-0000001207 00000 n 
-0000001306 00000 n 
-0000001352 00000 n 
-0000001497 00000 n 
+0000000755 00000 n 
+0000000854 00000 n 
+0000000915 00000 n 
+0000001157 00000 n 
+0000001256 00000 n 
+0000001302 00000 n 
+0000001447 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 11
+  /Size 10
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1533
+1482
 %%EOF
@@ -5,7 +5,7 @@
   item 2 is direct
   item 3 is indirect
   item 4 is direct
-  item 5 is indirect
+  item 5 is direct
 unparse: 9 0 R
-unparseResolved: [ /literal null /indirect 8 0 R /undefined 10 0 R ]
+unparseResolved: [ /literal null /indirect 8 0 R /undefined null ]
 test 1 done
@@ -18,7 +18,7 @@ endobj
   /indirect
   4 0 R
   /undefined
-  5 0 R
+  null
 ]
 endobj
@@ -27,7 +27,7 @@ endobj
 <<
   /Count 1
   /Kids [
-    6 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
@@ -38,16 +38,11 @@ endobj
 null
 endobj
-%% Original object ID: 10 0
-5 0 obj
-null
-endobj
-
 %% Page 1
 %% Original object ID: 3 0
-6 0 obj
+5 0 obj
 <<
-  /Contents 7 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -57,9 +52,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 9 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 10 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -67,9 +62,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-7 0 obj
+6 0 obj
 <<
-  /Length 8 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -80,12 +75,12 @@ ET
 endstream
 endobj
-8 0 obj
+7 0 obj
 44
 endobj
 %% Original object ID: 6 0
-9 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -96,7 +91,7 @@ endobj
 endobj
 %% Original object ID: 7 0
-10 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -104,24 +99,23 @@ endobj
 endobj
 xref
-0 11
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000239 00000 n 
-0000000338 00000 n 
-0000000387 00000 n 
-0000000445 00000 n 
-0000000688 00000 n 
-0000000787 00000 n 
-0000000833 00000 n 
-0000000978 00000 n 
+0000000238 00000 n 
+0000000337 00000 n 
+0000000395 00000 n 
+0000000637 00000 n 
+0000000736 00000 n 
+0000000782 00000 n 
+0000000927 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 11
+  /Size 10
   /ID [<06c2c8fc54c5f9cc9246898e1e1a7146><31415926535897932384626433832795>]
 >>
 startxref
-1014
+962
 %%EOF
@@ -14,14 +14,14 @@ endobj
 2 0 obj
 <<
   /dangling-ref-for-json-test [
-    4 0 R
+    null
   ]
   /hex#20strings [
     (Potato)
     <01020300040560>
     (AB)
   ]
-  /indirect 5 0 R
+  /indirect 4 0 R
   /names [
     /nesting
     /hex#20strings
@@ -71,27 +71,22 @@ endobj
 <<
   /Count 1
   /Kids [
-    6 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
 endobj
-%% Original object ID: 9 0
-4 0 obj
-null
-endobj
-
 %% Original object ID: 8 0
-5 0 obj
+4 0 obj
 (hello)
 endobj
 %% Page 1
 %% Original object ID: 3 0
-6 0 obj
+5 0 obj
 <<
-  /Contents 7 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -101,9 +96,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 9 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 10 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -111,9 +106,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-7 0 obj
+6 0 obj
 <<
-  /Length 8 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -124,12 +119,12 @@ ET
 endstream
 endobj
-8 0 obj
+7 0 obj
 44
 endobj
 %% Original object ID: 6 0
-9 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -140,7 +135,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-10 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -148,24 +143,23 @@ endobj
 endobj
 xref
-0 11
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000752 00000 n 
-0000000851 00000 n 
-0000000899 00000 n 
-0000000960 00000 n 
-0000001203 00000 n 
-0000001302 00000 n 
-0000001348 00000 n 
-0000001493 00000 n 
+0000000751 00000 n 
+0000000850 00000 n 
+0000000911 00000 n 
+0000001153 00000 n 
+0000001252 00000 n 
+0000001298 00000 n 
+0000001443 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 11
+  /Size 10
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1529
+1478
 %%EOF
@@ -14,14 +14,14 @@ endobj
 2 0 obj
 <<
   /dangling-ref-for-json-test [
-    4 0 R
+    null
   ]
   /hex#20strings [
     (Potato)
     <01020300040560>
     (AB)
   ]
-  /indirect 5 0 R
+  /indirect 4 0 R
   /names [
     /nesting
     /hex#20strings
@@ -71,37 +71,32 @@ endobj
 <<
   /Count 1
   /Kids [
-    7 0 R
+    6 0 R
   ]
   /Type /Pages
 >>
 endobj
-%% Original object ID: 9 0
-4 0 obj
-null
-endobj
-
 %% Original object ID: 8 0
-5 0 obj
+4 0 obj
 <<
   /K /V
-  /Length 6 0 R
+  /Length 5 0 R
 >>
 stream
 new-stream-here
 endstream
 endobj
-6 0 obj
+5 0 obj
 16
 endobj
 %% Page 1
 %% Original object ID: 3 0
-7 0 obj
+6 0 obj
 <<
-  /Contents 8 0 R
+  /Contents 7 0 R
   /MediaBox [
     0
     0
@@ -111,9 +106,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 10 0 R
+      /F1 9 0 R
     >>
-    /ProcSet 11 0 R
+    /ProcSet 10 0 R
   >>
   /Type /Page
 >>
@@ -121,9 +116,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-8 0 obj
+7 0 obj
 <<
-  /Length 9 0 R
+  /Length 8 0 R
 >>
 stream
 BT
@@ -134,12 +129,12 @@ ET
 endstream
 endobj
-9 0 obj
+8 0 obj
 44
 endobj
 %% Original object ID: 6 0
-10 0 obj
+9 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -150,7 +145,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-11 0 obj
+10 0 obj
 [
   /PDF
   /Text
@@ -158,25 +153,24 @@ endobj
 endobj
 xref
-0 12
+0 11
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000756 00000 n 
-0000000855 00000 n 
-0000000903 00000 n 
-0000000982 00000 n 
-0000001038 00000 n 
-0000001282 00000 n 
-0000001381 00000 n 
-0000001427 00000 n 
-0000001573 00000 n 
+0000000755 00000 n 
+0000000854 00000 n 
+0000000933 00000 n 
+0000000989 00000 n 
+0000001232 00000 n 
+0000001331 00000 n 
+0000001377 00000 n 
+0000001522 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 12
+  /Size 11
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1609
+1558
 %%EOF
@@ -14,14 +14,14 @@ endobj
 2 0 obj
 <<
   /dangling-ref-for-json-test [
-    4 0 R
+    null
   ]
   /hex#20strings [
     (Potato)
     <01020300040560>
     (AB)
   ]
-  /indirect 5 0 R
+  /indirect 4 0 R
   /names [
     /nesting
     /hex#20strings
@@ -71,27 +71,22 @@ endobj
 <<
   /Count 1
   /Kids [
-    6 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
 endobj
-%% Original object ID: 9 0
-4 0 obj
-null
-endobj
-
 %% Original object ID: 8 0
-5 0 obj
+4 0 obj
 (hello)
 endobj
 %% Page 1
 %% Original object ID: 3 0
-6 0 obj
+5 0 obj
 <<
-  /Contents 7 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -101,9 +96,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 9 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 10 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -111,9 +106,9 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-7 0 obj
+6 0 obj
 <<
-  /Length 8 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -124,12 +119,12 @@ ET
 endstream
 endobj
-8 0 obj
+7 0 obj
 43
 endobj
 %% Original object ID: 6 0
-9 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -140,7 +135,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-10 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -148,24 +143,23 @@ endobj
 endobj
 xref
-0 11
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000756 00000 n 
-0000000855 00000 n 
-0000000903 00000 n 
-0000000964 00000 n 
-0000001207 00000 n 
-0000001305 00000 n 
-0000001351 00000 n 
-0000001496 00000 n 
+0000000755 00000 n 
+0000000854 00000 n 
+0000000915 00000 n 
+0000001157 00000 n 
+0000001255 00000 n 
+0000001301 00000 n 
+0000001446 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 11
+  /Size 10
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1532
+1481
 %%EOF
@@ -14,14 +14,14 @@ endobj
 2 0 obj
 <<
   /dangling-ref-for-json-test [
-    4 0 R
+    null
   ]
   /hex#20strings [
     (Potato)
     <01020300040560>
     (AB)
   ]
-  /indirect 5 0 R
+  /indirect 4 0 R
   /names [
     /nesting
     /hex#20strings
@@ -71,27 +71,22 @@ endobj
 <<
   /Count 1
   /Kids [
-    6 0 R
+    5 0 R
   ]
   /Type /Pages
 >>
 endobj
-%% Original object ID: 9 0
-4 0 obj
-null
-endobj
-
 %% Original object ID: 8 0
-5 0 obj
+4 0 obj
 (hello)
 endobj
 %% Page 1
 %% Original object ID: 3 0
-6 0 obj
+5 0 obj
 <<
-  /Contents 7 0 R
+  /Contents 6 0 R
   /MediaBox [
     0
     0
@@ -101,9 +96,9 @@ endobj
   /Parent 3 0 R
   /Resources <<
     /Font <<
-      /F1 9 0 R
+      /F1 8 0 R
     >>
-    /ProcSet 10 0 R
+    /ProcSet 9 0 R
   >>
   /Type /Page
 >>
@@ -111,10 +106,10 @@ endobj
 %% Contents for page 1
 %% Original object ID: 4 0
-7 0 obj
+6 0 obj
 <<
   /Potato (salad)
-  /Length 8 0 R
+  /Length 7 0 R
 >>
 stream
 BT
@@ -125,12 +120,12 @@ ET
 endstream
 endobj
-8 0 obj
+7 0 obj
 44
 endobj
 %% Original object ID: 6 0
-9 0 obj
+8 0 obj
 <<
   /BaseFont /Helvetica
   /Encoding /WinAnsiEncoding
@@ -141,7 +136,7 @@ endobj
 endobj
 %% Original object ID: 5 0
-10 0 obj
+9 0 obj
 [
   /PDF
   /Text
@@ -149,24 +144,23 @@ endobj
 endobj
 xref
-0 11
+0 10
 0000000000 65535 f 
 0000000052 00000 n 
 0000000133 00000 n 
-0000000756 00000 n 
-0000000855 00000 n 
-0000000903 00000 n 
-0000000964 00000 n 
-0000001207 00000 n 
-0000001324 00000 n 
-0000001370 00000 n 
-0000001515 00000 n 
+0000000755 00000 n 
+0000000854 00000 n 
+0000000915 00000 n 
+0000001157 00000 n 
+0000001274 00000 n 
+0000001320 00000 n 
+0000001465 00000 n 
 trailer <<
   /QTest 2 0 R
   /Root 1 0 R
-  /Size 11
+  /Size 10
   /ID [<31415926535897932384626433832795><31415926535897932384626433832795>]
 >>
 startxref
-1551
+1500
 %%EOF