diff --git a/direct/src/dcparser/dcArrayParameter.cxx b/direct/src/dcparser/dcArrayParameter.cxx
index 90677a6a7a..7a26e6b0ed 100644
--- a/direct/src/dcparser/dcArrayParameter.cxx
+++ b/direct/src/dcparser/dcArrayParameter.cxx
@@ -35,6 +35,8 @@ DCArrayParameter(DCParameter *element_type, const DCUnsignedIntRange &size) :
   _array_size = -1;
   if (_array_size_range.has_one_value()) {
     _array_size = _array_size_range.get_one_value();
+  } else {
+    _has_range_limits = true;
   }
 
   if (_array_size >= 0 && _element_type->has_fixed_byte_size()) {
@@ -48,6 +50,10 @@ DCArrayParameter(DCParameter *element_type, const DCUnsignedIntRange &size) :
     _num_length_bytes = 2;
   }
 
+  if (_element_type->has_range_limits()) {
+    _has_range_limits = true;
+  }
+
   _has_nested_fields = true;
   _num_nested_fields = _array_size;
   _pack_type = PT_array;
diff --git a/direct/src/dcparser/dcAtomicField.cxx b/direct/src/dcparser/dcAtomicField.cxx
index fa7c9eed00..81d9ee72eb 100644
--- a/direct/src/dcparser/dcAtomicField.cxx
+++ b/direct/src/dcparser/dcAtomicField.cxx
@@ -246,6 +246,9 @@ add_element(const DCAtomicField::ElementType &element) {
   if (_has_fixed_structure) {
     _has_fixed_structure = element._param->has_fixed_structure();
   }
+  if (!_has_range_limits) {
+    _has_range_limits = element._param->has_range_limits();
+  }
 }
 
 ////////////////////////////////////////////////////////////////////
diff --git a/direct/src/dcparser/dcClass.cxx b/direct/src/dcparser/dcClass.cxx
index 926026131f..146727c917 100644
--- a/direct/src/dcparser/dcClass.cxx
+++ b/direct/src/dcparser/dcClass.cxx
@@ -22,6 +22,8 @@
 #include "dcindent.h"
 #include "dcmsgtypes.h"
 
+#include "dcClassParameter.h"
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DCClass::Constructor
 //       Access: Public
diff --git a/direct/src/dcparser/dcClassParameter.cxx b/direct/src/dcparser/dcClassParameter.cxx
index 7fe5331cbe..e0cafb43cc 100644
--- a/direct/src/dcparser/dcClassParameter.cxx
+++ b/direct/src/dcparser/dcClassParameter.cxx
@@ -26,7 +26,7 @@
 //  Description: 
 ////////////////////////////////////////////////////////////////////
 DCClassParameter::
-DCClassParameter(DCClass *dclass) :
+DCClassParameter(const DCClass *dclass) :
   _dclass(dclass)
 {
   set_name(dclass->get_name());
@@ -44,7 +44,8 @@ DCClassParameter(DCClass *dclass) :
   if (_dclass->has_constructor()) {
     _nested_fields.push_back(_dclass->get_constructor());
   }
-  for (int i = 0 ; i < num_fields; i++) {
+  int i;
+  for (i = 0 ; i < num_fields; i++) {
     _nested_fields.push_back(_dclass->get_inherited_field(i));
   }
 
@@ -54,11 +55,13 @@ DCClassParameter(DCClass *dclass) :
   _has_fixed_byte_size = true;
   _fixed_byte_size = 0;
   _has_fixed_structure = true;
-  for (int i = 0; i < _num_nested_fields && _has_fixed_byte_size; i++) {
+  for (i = 0; i < _num_nested_fields; i++) {
     DCPackerInterface *field = get_nested_field(i);
     _has_fixed_byte_size = _has_fixed_byte_size && field->has_fixed_byte_size();
     _fixed_byte_size += field->get_fixed_byte_size();
     _has_fixed_structure = _has_fixed_structure && field->has_fixed_structure();
+
+    _has_range_limits = _has_range_limits || field->has_range_limits();
   }
 }
 
@@ -112,7 +115,7 @@ is_valid() const {
 //       Access: Published
 //  Description: Returns the class object this parameter represents.
 ////////////////////////////////////////////////////////////////////
-DCClass *DCClassParameter::
+const DCClass *DCClassParameter::
 get_class() const {
   return _dclass;
 }
diff --git a/direct/src/dcparser/dcClassParameter.h b/direct/src/dcparser/dcClassParameter.h
index 4fac13642e..ccc262b101 100644
--- a/direct/src/dcparser/dcClassParameter.h
+++ b/direct/src/dcparser/dcClassParameter.h
@@ -32,7 +32,7 @@ class DCClass;
 ////////////////////////////////////////////////////////////////////
 class EXPCL_DIRECT DCClassParameter : public DCParameter {
 public:
-  DCClassParameter(DCClass *dclass);
+  DCClassParameter(const DCClass *dclass);
   DCClassParameter(const DCClassParameter &copy);
 
 PUBLISHED:
@@ -40,7 +40,7 @@ PUBLISHED:
   virtual DCParameter *make_copy() const;
   virtual bool is_valid() const;
 
-  DCClass *get_class() const;
+  const DCClass *get_class() const;
 
 public:
   virtual DCPackerInterface *get_nested_field(int n) const;
@@ -53,7 +53,7 @@ private:
   typedef pvector<DCPackerInterface *> Fields;
   Fields _nested_fields;
 
-  DCClass *_dclass;
+  const DCClass *_dclass;
 };
 
 #endif
diff --git a/direct/src/dcparser/dcFile.cxx b/direct/src/dcparser/dcFile.cxx
index 9035ceb25a..666fa4d381 100644
--- a/direct/src/dcparser/dcFile.cxx
+++ b/direct/src/dcparser/dcFile.cxx
@@ -60,14 +60,23 @@ DCFile::
 ////////////////////////////////////////////////////////////////////
 void DCFile::
 clear() {
-  Classes::iterator ci;
-  for (ci = _classes.begin(); ci != _classes.end(); ++ci) {
-    delete (*ci);
+  Declarations::iterator di;
+  for (di = _declarations.begin(); di != _declarations.end(); ++di) {
+    delete (*di);
+  }
+  for (di = _things_to_delete.begin(); di != _things_to_delete.end(); ++di) {
+    delete (*di);
   }
   
   _classes.clear();
   _imports.clear();
   _things_by_name.clear();
+  _typedefs.clear();
+  _typedefs_by_name.clear();
+  _declarations.clear();
+  _things_to_delete.clear();
+
+  _all_objects_valid = true;
 }
 
 #ifdef WITHIN_PANDA
@@ -135,7 +144,17 @@ read(Filename filename) {
       return false;
     }
     bool okflag = read(*in, filename);
+
+    // For some reason--compiler bug in gcc 3.2?--explicitly deleting
+    // the in pointer does not call the appropriate global delete
+    // function; instead apparently calling the system delete
+    // function.  So we call the delete function by hand instead.
+#ifndef NDEBUG
+    (*global_operator_delete)(in);
+#else
     delete in;
+#endif
+
     return okflag;
   }
   filename.open_read(in);
@@ -465,6 +484,8 @@ add_class(DCClass *dclass) {
 
   if (!dclass->is_bogus_class()) {
     _declarations.push_back(dclass);
+  } else {
+    _things_to_delete.push_back(dclass);
   }
 
   return true;
@@ -552,7 +573,23 @@ add_typedef(DCTypedef *dtypedef) {
 
   if (!dtypedef->is_bogus_typedef() && !dtypedef->is_implicit_typedef()) {
     _declarations.push_back(dtypedef);
+  } else {
+    _things_to_delete.push_back(dtypedef);
   }
 
   return true;
 }
+
+////////////////////////////////////////////////////////////////////
+//     Function: DCFile::add_thing_to_delete
+//       Access: Public
+//  Description: Adds the indicated declaration to the list of
+//               declarations that are not reported with the file, but
+//               will be deleted when the DCFile object destructs.
+//               That is, transfers ownership of the indicated pointer
+//               to the DCFile.
+////////////////////////////////////////////////////////////////////
+void DCFile::
+add_thing_to_delete(DCDeclaration *decl) {
+  _things_to_delete.push_back(decl);
+}
diff --git a/direct/src/dcparser/dcFile.h b/direct/src/dcparser/dcFile.h
index 2cb2e638c2..07d73c6f8a 100644
--- a/direct/src/dcparser/dcFile.h
+++ b/direct/src/dcparser/dcFile.h
@@ -74,6 +74,7 @@ public:
   void add_import_module(const string &import_module);
   void add_import_symbol(const string &import_symbol);
   bool add_typedef(DCTypedef *dtypedef);
+  void add_thing_to_delete(DCDeclaration *decl);
 
 private:
   typedef pvector<DCClass *> Classes;
@@ -100,6 +101,7 @@ private:
 
   typedef pvector<DCDeclaration *> Declarations;
   Declarations _declarations;
+  Declarations _things_to_delete;
 
   bool _all_objects_valid;
 };
diff --git a/direct/src/dcparser/dcMolecularField.cxx b/direct/src/dcparser/dcMolecularField.cxx
index 4735cf0882..ffc0e1b64e 100644
--- a/direct/src/dcparser/dcMolecularField.cxx
+++ b/direct/src/dcparser/dcMolecularField.cxx
@@ -102,6 +102,9 @@ add_atomic(DCAtomicField *atomic) {
   if (_has_fixed_structure) {
     _has_fixed_structure = atomic->has_fixed_structure();
   }
+  if (!_has_range_limits) {
+    _has_range_limits = atomic->has_range_limits();
+  }
 }
 
 ////////////////////////////////////////////////////////////////////
diff --git a/direct/src/dcparser/dcPacker.cxx b/direct/src/dcparser/dcPacker.cxx
index 28675861ac..b516ec7150 100755
--- a/direct/src/dcparser/dcPacker.cxx
+++ b/direct/src/dcparser/dcPacker.cxx
@@ -603,12 +603,9 @@ unpack_skip() {
   if (_current_field == NULL) {
     _pack_error = true;
 
-  } else if (_current_field->has_fixed_byte_size()) {
-    _unpack_p += _current_field->get_fixed_byte_size();
-    advance();
-
   } else {
-    if (_current_field->unpack_skip(_unpack_data, _unpack_length, _unpack_p)) {
+    if (_current_field->unpack_skip(_unpack_data, _unpack_length, _unpack_p,
+                                    _pack_error)) {
       advance();
 
     } else {
@@ -657,7 +654,7 @@ pack_object(PyObject *object) {
     int size = PySequence_Size(object);
     bool is_instance = false;
 
-    DCClass *dclass = NULL;
+    const DCClass *dclass = NULL;
     const DCClassParameter *class_param = ((DCPackerInterface *)get_current_field())->as_class_parameter();
     if (class_param != (DCClassParameter *)NULL) {
       dclass = class_param->get_class();
@@ -794,7 +791,7 @@ unpack_object() {
     {
       const DCClassParameter *class_param = ((DCPackerInterface *)get_current_field())->as_class_parameter();
       if (class_param != (DCClassParameter *)NULL) {
-        DCClass *dclass = class_param->get_class();
+        const DCClass *dclass = class_param->get_class();
         if (dclass->has_class_def()) {
           // If we know what kind of class object this is and it has a
           // valid constructor, create the class object instead of
@@ -1095,7 +1092,7 @@ clear() {
 //               appropriate values from the class object and pack in.
 ////////////////////////////////////////////////////////////////////
 void DCPacker::
-pack_class_object(DCClass *dclass, PyObject *object) {
+pack_class_object(const DCClass *dclass, PyObject *object) {
   PyObject *str = PyObject_Str(object);
   cerr << "pack_class_object(" << dclass->get_name() << ", " 
        << PyString_AsString(str) << ")\n";
@@ -1122,7 +1119,7 @@ pack_class_object(DCClass *dclass, PyObject *object) {
 //               constructor, unpack it and fill in its values.
 ////////////////////////////////////////////////////////////////////
 PyObject *DCPacker::
-unpack_class_object(DCClass *dclass) {
+unpack_class_object(const DCClass *dclass) {
   PyObject *class_def = dclass->get_class_def();
   nassertr(class_def != (PyObject *)NULL, NULL);
 
diff --git a/direct/src/dcparser/dcPacker.h b/direct/src/dcparser/dcPacker.h
index 7df73daafa..ccffcb3431 100755
--- a/direct/src/dcparser/dcPacker.h
+++ b/direct/src/dcparser/dcPacker.h
@@ -178,8 +178,8 @@ private:
   void clear();
 
 #ifdef HAVE_PYTHON
-  void pack_class_object(DCClass *dclass, PyObject *object);
-  PyObject *unpack_class_object(DCClass *dclass);
+  void pack_class_object(const DCClass *dclass, PyObject *object);
+  PyObject *unpack_class_object(const DCClass *dclass);
   void set_class_element(PyObject *class_def, PyObject *&object, 
                          const DCField *field);
 #endif
diff --git a/direct/src/dcparser/dcPackerInterface.I b/direct/src/dcparser/dcPackerInterface.I
index da214f2fcb..5624fa7a84 100644
--- a/direct/src/dcparser/dcPackerInterface.I
+++ b/direct/src/dcparser/dcPackerInterface.I
@@ -78,6 +78,19 @@ has_fixed_structure() const {
   return _has_fixed_structure;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DCPackerInterface::has_range_limits
+//       Access: Public
+//  Description: Returns true if this field, or any sub-field of this
+//               field, has a limit imposed in the DC file on its
+//               legal values.  If this is false, then
+//               unpack_validate() is trivial.
+////////////////////////////////////////////////////////////////////
+INLINE bool DCPackerInterface::
+has_range_limits() const {
+  return _has_range_limits;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DCPackerInterface::get_num_length_bytes
 //       Access: Public
diff --git a/direct/src/dcparser/dcPackerInterface.cxx b/direct/src/dcparser/dcPackerInterface.cxx
index 6347721f9a..f9b1c3fa9e 100755
--- a/direct/src/dcparser/dcPackerInterface.cxx
+++ b/direct/src/dcparser/dcPackerInterface.cxx
@@ -31,6 +31,7 @@ DCPackerInterface(const string &name) :
   _has_fixed_byte_size = false;
   _fixed_byte_size = 0;
   _has_fixed_structure = false;
+  _has_range_limits = false;
   _num_length_bytes = 0;
   _has_nested_fields = false;
   _num_nested_fields = -1;
@@ -49,6 +50,7 @@ DCPackerInterface(const DCPackerInterface &copy) :
   _has_fixed_byte_size(copy._has_fixed_byte_size),
   _fixed_byte_size(copy._fixed_byte_size),
   _has_fixed_structure(copy._has_fixed_structure),
+  _has_range_limits(copy._has_range_limits),
   _num_length_bytes(copy._num_length_bytes),
   _has_nested_fields(copy._has_nested_fields),
   _num_nested_fields(copy._num_nested_fields),
@@ -284,7 +286,11 @@ unpack_string(const char *, size_t, size_t &, string &, bool &pack_error, bool &
 //               validate this field).
 ////////////////////////////////////////////////////////////////////
 bool DCPackerInterface::
-unpack_validate(const char *, size_t, size_t &, bool &, bool &) const {
+unpack_validate(const char *data, size_t length, size_t &p,
+                bool &pack_error, bool &) const {
+  if (!_has_range_limits) {
+    return unpack_skip(data, length, p, pack_error);
+  }
   return false;
 }
 
@@ -297,7 +303,15 @@ unpack_validate(const char *, size_t, size_t &, bool &, bool &) const {
 //               failure (e.g. we don't know how to skip this field).
 ////////////////////////////////////////////////////////////////////
 bool DCPackerInterface::
-unpack_skip(const char *, size_t, size_t &) const {
+unpack_skip(const char *data, size_t length, size_t &p,
+            bool &pack_error) const {
+  if (_has_fixed_byte_size) {
+    p += _fixed_byte_size;
+    if (p > length) {
+      pack_error = true;
+    }
+    return true;
+  }
   return false;
 }
 
diff --git a/direct/src/dcparser/dcPackerInterface.h b/direct/src/dcparser/dcPackerInterface.h
index bf611df915..1c3ac9c549 100755
--- a/direct/src/dcparser/dcPackerInterface.h
+++ b/direct/src/dcparser/dcPackerInterface.h
@@ -85,6 +85,7 @@ public:
   INLINE bool has_fixed_byte_size() const;
   INLINE size_t get_fixed_byte_size() const;
   INLINE bool has_fixed_structure() const;
+  INLINE bool has_range_limits() const;
   INLINE size_t get_num_length_bytes() const;
 
   INLINE bool has_nested_fields() const;
@@ -123,7 +124,8 @@ public:
                              string &value, bool &pack_error, bool &range_error) const;
   virtual bool unpack_validate(const char *data, size_t length, size_t &p, 
                                bool &pack_error, bool &range_error) const;
-  virtual bool unpack_skip(const char *data, size_t length, size_t &p) const;
+  virtual bool unpack_skip(const char *data, size_t length, size_t &p,
+                           bool &pack_error) const;
 
   // These are the low-level interfaces for packing and unpacking
   // numbers from a buffer.  You're responsible for making sure the
@@ -167,6 +169,7 @@ protected:
   bool _has_fixed_byte_size;
   size_t _fixed_byte_size;
   bool _has_fixed_structure;
+  bool _has_range_limits;
   size_t _num_length_bytes;
   bool _has_nested_fields;
   int _num_nested_fields;
diff --git a/direct/src/dcparser/dcParser.cxx.prebuilt b/direct/src/dcparser/dcParser.cxx.prebuilt
index 9b9512b317..c63e0bdf4f 100644
--- a/direct/src/dcparser/dcParser.cxx.prebuilt
+++ b/direct/src/dcparser/dcParser.cxx.prebuilt
@@ -240,21 +240,21 @@ static const short yyrhs[] =
 static const short yyrline[] =
 {
        0,   147,   149,   152,   154,   155,   166,   172,   173,   176,
-     176,   189,   194,   200,   213,   215,   221,   223,   229,   234,
-     234,   241,   243,   249,   254,   260,   276,   278,   281,   288,
-     296,   298,   299,   307,   309,   310,   315,   322,   322,   336,
-     338,   341,   343,   346,   352,   352,   377,   377,   388,   392,
-     394,   397,   402,   410,   421,   435,   449,   475,   479,   485,
-     490,   497,   504,   513,   519,   525,   535,   540,   547,   554,
-     560,   568,   570,   576,   582,   596,   602,   612,   615,   626,
-     630,   634,   639,   643,   646,   656,   660,   665,   669,   673,
-     677,   681,   681,   689,   689,   697,   697,   705,   711,   717,
-     723,   731,   733,   736,   738,   741,   743,   746,   751,   755,
-     759,   763,   767,   771,   775,   779,   783,   787,   791,   795,
-     799,   803,   807,   811,   815,   819,   823,   829,   834,   838,
-     842,   846,   850,   854,   858,   862,   866,   872,   872,   883,
-     899,   906,   919,   924,   927,   927,   941,   943,   944,   945,
-     955,   955,   972,   977,   983
+     176,   189,   194,   200,   214,   216,   222,   224,   230,   235,
+     235,   242,   244,   250,   255,   261,   277,   279,   282,   289,
+     297,   299,   300,   308,   310,   311,   316,   323,   323,   337,
+     339,   342,   344,   347,   353,   353,   378,   378,   389,   393,
+     395,   398,   403,   411,   422,   436,   450,   476,   482,   490,
+     495,   502,   509,   518,   524,   530,   540,   545,   552,   559,
+     565,   573,   575,   581,   587,   601,   607,   617,   620,   631,
+     635,   639,   644,   648,   651,   661,   665,   670,   674,   678,
+     682,   686,   686,   694,   694,   702,   702,   710,   716,   722,
+     728,   736,   738,   741,   743,   746,   748,   751,   756,   760,
+     764,   768,   772,   776,   780,   784,   788,   792,   796,   800,
+     804,   808,   812,   816,   820,   824,   828,   834,   839,   843,
+     847,   851,   855,   859,   863,   867,   871,   877,   877,   888,
+     904,   911,   924,   929,   932,   932,   946,   948,   949,   950,
+     960,   960,   977,   982,   988
 };
 #endif
 
@@ -1237,6 +1237,7 @@ case 13:
 {
   DCClass *dclass = dc_file->get_class_by_name(yyvsp[0].str);
   if (dclass == (DCClass *)NULL) {
+    // Create a bogus class as a forward reference.
     dclass = new DCClass(yyvsp[0].str, false, true);
     dc_file->add_class(dclass);
   }
@@ -1245,49 +1246,49 @@ case 13:
 }
     break;
 case 15:
-#line 216 "dcParser.yxx"
+#line 217 "dcParser.yxx"
 {
   yyval.str = yyvsp[-2].str + string("/") + yyvsp[0].str;
 }
     break;
 case 17:
-#line 224 "dcParser.yxx"
+#line 225 "dcParser.yxx"
 {
   yyval.str = yyvsp[-2].str + string(".") + yyvsp[0].str;
 }
     break;
 case 18:
-#line 231 "dcParser.yxx"
+#line 232 "dcParser.yxx"
 {
   dc_file->add_import_module(yyvsp[0].str);
 }
     break;
 case 19:
-#line 235 "dcParser.yxx"
+#line 236 "dcParser.yxx"
 {
   dc_file->add_import_module(yyvsp[-1].str);
 }
     break;
 case 22:
-#line 244 "dcParser.yxx"
+#line 245 "dcParser.yxx"
 {
   dc_file->add_import_symbol("*");
 }
     break;
 case 23:
-#line 251 "dcParser.yxx"
+#line 252 "dcParser.yxx"
 {
   dc_file->add_import_symbol(yyvsp[0].str);
 }
     break;
 case 24:
-#line 255 "dcParser.yxx"
+#line 256 "dcParser.yxx"
 {
   dc_file->add_import_symbol(yyvsp[0].str);
 }
     break;
 case 25:
-#line 262 "dcParser.yxx"
+#line 263 "dcParser.yxx"
 {
   DCTypedef *dtypedef = new DCTypedef(yyvsp[0].u.parameter);
 
@@ -1302,7 +1303,7 @@ case 25:
 }
     break;
 case 28:
-#line 283 "dcParser.yxx"
+#line 284 "dcParser.yxx"
 {
   if (yyvsp[0].u.dclass != (DCClass *)NULL) {
     current_class->add_parent(yyvsp[0].u.dclass);
@@ -1310,7 +1311,7 @@ case 28:
 }
     break;
 case 29:
-#line 289 "dcParser.yxx"
+#line 290 "dcParser.yxx"
 {
   if (yyvsp[0].u.dclass != (DCClass *)NULL) {
     current_class->add_parent(yyvsp[0].u.dclass);
@@ -1318,7 +1319,7 @@ case 29:
 }
     break;
 case 32:
-#line 300 "dcParser.yxx"
+#line 301 "dcParser.yxx"
 {
   if (!current_class->add_field(yyvsp[0].u.field)) {
     yyerror("Duplicate field name: " + yyvsp[0].u.field->get_name());
@@ -1326,28 +1327,28 @@ case 32:
 }
     break;
 case 35:
-#line 311 "dcParser.yxx"
+#line 312 "dcParser.yxx"
 {
   yyval.u.field = yyvsp[-2].u.parameter;
   yyval.u.field->set_flags(yyvsp[-1].u.s_int);
 }
     break;
 case 36:
-#line 316 "dcParser.yxx"
+#line 317 "dcParser.yxx"
 {
   yyval.u.field = yyvsp[-1].u.parameter;
   yyval.u.field->set_flags(yyvsp[0].u.s_int);
 }
     break;
 case 37:
-#line 324 "dcParser.yxx"
+#line 325 "dcParser.yxx"
 {
   yyval.u.field = current_atomic;
   current_atomic = new DCAtomicField(yyvsp[-1].str);
 }
     break;
 case 38:
-#line 329 "dcParser.yxx"
+#line 330 "dcParser.yxx"
 {
   yyval.u.field = current_atomic;
   current_atomic = yyvsp[-3].u.atomic;
@@ -1355,14 +1356,14 @@ case 38:
 }
     break;
 case 43:
-#line 348 "dcParser.yxx"
+#line 349 "dcParser.yxx"
 {
   atomic_element = DCAtomicField::ElementType(yyvsp[0].u.parameter);
   current_atomic->add_element(atomic_element);
 }
     break;
 case 44:
-#line 353 "dcParser.yxx"
+#line 354 "dcParser.yxx"
 {
   current_packer = &default_packer;
   current_packer->clear_data();
@@ -1370,7 +1371,7 @@ case 44:
 }
     break;
 case 45:
-#line 359 "dcParser.yxx"
+#line 360 "dcParser.yxx"
 {
   bool is_valid = yyvsp[-3].u.parameter->is_valid();
   atomic_element = DCAtomicField::ElementType(yyvsp[-3].u.parameter);
@@ -1389,25 +1390,25 @@ case 45:
 }
     break;
 case 46:
-#line 379 "dcParser.yxx"
+#line 380 "dcParser.yxx"
 {
   current_parameter = yyvsp[0].u.parameter;
 }
     break;
 case 47:
-#line 383 "dcParser.yxx"
+#line 384 "dcParser.yxx"
 {
   yyval.u.parameter = yyvsp[0].u.parameter;
 }
     break;
 case 51:
-#line 399 "dcParser.yxx"
+#line 400 "dcParser.yxx"
 {
   yyval.u.parameter = new DCSimpleParameter(yyvsp[0].u.subatomic);
 }
     break;
 case 52:
-#line 403 "dcParser.yxx"
+#line 404 "dcParser.yxx"
 {
   DCSimpleParameter *simple_param = new DCSimpleParameter(yyvsp[-3].u.subatomic);
   if (!simple_param->set_range(double_range)) {
@@ -1417,7 +1418,7 @@ case 52:
 }
     break;
 case 53:
-#line 411 "dcParser.yxx"
+#line 412 "dcParser.yxx"
 {
   DCSimpleParameter *simple_param = new DCSimpleParameter(yyvsp[-2].u.subatomic);
   if (yyvsp[0].u.s_uint == 0) {
@@ -1430,7 +1431,7 @@ case 53:
 }
     break;
 case 54:
-#line 422 "dcParser.yxx"
+#line 423 "dcParser.yxx"
 {
   DCSimpleParameter *simple_param = new DCSimpleParameter(yyvsp[-5].u.subatomic);
   if (yyvsp[-3].u.s_uint == 0) {
@@ -1446,7 +1447,7 @@ case 54:
 }
     break;
 case 55:
-#line 436 "dcParser.yxx"
+#line 437 "dcParser.yxx"
 {
   DCSimpleParameter *simple_param = new DCSimpleParameter(yyvsp[-5].u.subatomic);
   if (yyvsp[0].u.s_uint == 0) {
@@ -1462,7 +1463,7 @@ case 55:
 }
     break;
 case 56:
-#line 450 "dcParser.yxx"
+#line 451 "dcParser.yxx"
 {
   DCTypedef *dtypedef = dc_file->get_typedef_by_name(yyvsp[0].str);
   if (dtypedef == (DCTypedef *)NULL) {
@@ -1490,25 +1491,29 @@ case 56:
 }
     break;
 case 57:
-#line 476 "dcParser.yxx"
+#line 477 "dcParser.yxx"
 {
+  // This is an inline class definition.
+  dc_file->add_thing_to_delete(yyvsp[0].u.dclass);
   yyval.u.parameter = new DCClassParameter(yyvsp[0].u.dclass);
 }
     break;
 case 58:
-#line 480 "dcParser.yxx"
+#line 483 "dcParser.yxx"
 {
+  // This is an inline switch definition.
+  dc_file->add_thing_to_delete(yyvsp[0].u.dswitch);
   yyval.u.parameter = new DCSwitchParameter(yyvsp[0].u.dswitch);
 }
     break;
 case 59:
-#line 487 "dcParser.yxx"
+#line 492 "dcParser.yxx"
 {
   double_range.clear();
 }
     break;
 case 60:
-#line 491 "dcParser.yxx"
+#line 496 "dcParser.yxx"
 {
   double_range.clear();
   if (!double_range.add_range(yyvsp[0].u.real, yyvsp[0].u.real)) {
@@ -1517,7 +1522,7 @@ case 60:
 }
     break;
 case 61:
-#line 498 "dcParser.yxx"
+#line 503 "dcParser.yxx"
 {
   double_range.clear();
   if (!double_range.add_range(yyvsp[-2].u.real, yyvsp[0].u.real)) {
@@ -1526,7 +1531,7 @@ case 61:
 }
     break;
 case 62:
-#line 505 "dcParser.yxx"
+#line 510 "dcParser.yxx"
 {
   double_range.clear();
   if (yyvsp[0].u.real >= 0) {
@@ -1537,7 +1542,7 @@ case 62:
 }
     break;
 case 63:
-#line 514 "dcParser.yxx"
+#line 519 "dcParser.yxx"
 {
   if (!double_range.add_range(yyvsp[0].u.real, yyvsp[0].u.real)) {
     yyerror("Overlapping range");
@@ -1545,7 +1550,7 @@ case 63:
 }
     break;
 case 64:
-#line 520 "dcParser.yxx"
+#line 525 "dcParser.yxx"
 {
   if (!double_range.add_range(yyvsp[-2].u.real, yyvsp[0].u.real)) {
     yyerror("Overlapping range");
@@ -1553,7 +1558,7 @@ case 64:
 }
     break;
 case 65:
-#line 526 "dcParser.yxx"
+#line 531 "dcParser.yxx"
 {
   if (yyvsp[0].u.real >= 0) {
     yyerror("Syntax error");
@@ -1563,13 +1568,13 @@ case 65:
 }
     break;
 case 66:
-#line 537 "dcParser.yxx"
+#line 542 "dcParser.yxx"
 {
   uint_range.clear();
 }
     break;
 case 67:
-#line 541 "dcParser.yxx"
+#line 546 "dcParser.yxx"
 {
   uint_range.clear();
   if (!uint_range.add_range(yyvsp[0].u.s_uint, yyvsp[0].u.s_uint)) {
@@ -1578,7 +1583,7 @@ case 67:
 }
     break;
 case 68:
-#line 548 "dcParser.yxx"
+#line 553 "dcParser.yxx"
 {
   uint_range.clear();
   if (!uint_range.add_range(yyvsp[-2].u.s_uint, yyvsp[0].u.s_uint)) {
@@ -1587,7 +1592,7 @@ case 68:
 }
     break;
 case 69:
-#line 555 "dcParser.yxx"
+#line 560 "dcParser.yxx"
 {
   if (!uint_range.add_range(yyvsp[0].u.s_uint, yyvsp[0].u.s_uint)) {
     yyerror("Overlapping range");
@@ -1595,7 +1600,7 @@ case 69:
 }
     break;
 case 70:
-#line 561 "dcParser.yxx"
+#line 566 "dcParser.yxx"
 {
   if (!uint_range.add_range(yyvsp[-2].u.s_uint, yyvsp[0].u.s_uint)) {
     yyerror("Overlapping range");
@@ -1603,20 +1608,20 @@ case 70:
 }
     break;
 case 72:
-#line 571 "dcParser.yxx"
+#line 576 "dcParser.yxx"
 {
   yyval.u.parameter = new DCArrayParameter(yyvsp[-3].u.parameter, uint_range);
 }
     break;
 case 73:
-#line 578 "dcParser.yxx"
+#line 583 "dcParser.yxx"
 {
   current_parameter->set_name(yyvsp[0].str);
   yyval.u.parameter = current_parameter;
 }
     break;
 case 74:
-#line 583 "dcParser.yxx"
+#line 588 "dcParser.yxx"
 {
   if (yyvsp[0].u.s_uint == 0) {
     yyerror("Invalid divisor.");
@@ -1632,13 +1637,13 @@ case 74:
 }
     break;
 case 75:
-#line 597 "dcParser.yxx"
+#line 602 "dcParser.yxx"
 {
   yyval.u.parameter = new DCArrayParameter(yyvsp[-3].u.parameter, uint_range);
 }
     break;
 case 76:
-#line 604 "dcParser.yxx"
+#line 609 "dcParser.yxx"
 {
   if (yyvsp[0].str.length() != 1) {
     yyerror("Single character required.");
@@ -1649,7 +1654,7 @@ case 76:
 }
     break;
 case 78:
-#line 617 "dcParser.yxx"
+#line 622 "dcParser.yxx"
 {
   yyval.u.s_uint = (unsigned int)yyvsp[0].u.uint64;
   if (yyval.u.s_uint != yyvsp[0].u.uint64) {
@@ -1659,19 +1664,19 @@ case 78:
 }
     break;
 case 81:
-#line 636 "dcParser.yxx"
+#line 641 "dcParser.yxx"
 {
   yyval.u.real = (double)yyvsp[0].u.uint64;
 }
     break;
 case 82:
-#line 640 "dcParser.yxx"
+#line 645 "dcParser.yxx"
 {
   yyval.u.real = (double)yyvsp[0].u.int64;
 }
     break;
 case 84:
-#line 648 "dcParser.yxx"
+#line 653 "dcParser.yxx"
 {
   if (yyvsp[0].str.length() != 1) {
     yyerror("Single character required.");
@@ -1682,73 +1687,73 @@ case 84:
 }
     break;
 case 86:
-#line 662 "dcParser.yxx"
+#line 667 "dcParser.yxx"
 {
   current_packer->pack_int64(yyvsp[0].u.int64);
 }
     break;
 case 87:
-#line 666 "dcParser.yxx"
+#line 671 "dcParser.yxx"
 {
   current_packer->pack_uint64(yyvsp[0].u.uint64);
 }
     break;
 case 88:
-#line 670 "dcParser.yxx"
+#line 675 "dcParser.yxx"
 {
   current_packer->pack_double(yyvsp[0].u.real);
 }
     break;
 case 89:
-#line 674 "dcParser.yxx"
+#line 679 "dcParser.yxx"
 {
   current_packer->pack_string(yyvsp[0].str);
 }
     break;
 case 90:
-#line 678 "dcParser.yxx"
+#line 683 "dcParser.yxx"
 {
   current_packer->pack_literal_value(yyvsp[0].str);
 }
     break;
 case 91:
-#line 682 "dcParser.yxx"
+#line 687 "dcParser.yxx"
 {
   current_packer->push();
 }
     break;
 case 92:
-#line 686 "dcParser.yxx"
+#line 691 "dcParser.yxx"
 {
   current_packer->pop();
 }
     break;
 case 93:
-#line 690 "dcParser.yxx"
+#line 695 "dcParser.yxx"
 {
   current_packer->push();
 }
     break;
 case 94:
-#line 694 "dcParser.yxx"
+#line 699 "dcParser.yxx"
 {
   current_packer->pop();
 }
     break;
 case 95:
-#line 698 "dcParser.yxx"
+#line 703 "dcParser.yxx"
 {
   current_packer->push();
 }
     break;
 case 96:
-#line 702 "dcParser.yxx"
+#line 707 "dcParser.yxx"
 {
   current_packer->pop();
 }
     break;
 case 97:
-#line 706 "dcParser.yxx"
+#line 711 "dcParser.yxx"
 {
   for (unsigned int i = 0; i < yyvsp[0].u.s_uint; i++) {
     current_packer->pack_int64(yyvsp[-2].u.int64);
@@ -1756,7 +1761,7 @@ case 97:
 }
     break;
 case 98:
-#line 712 "dcParser.yxx"
+#line 717 "dcParser.yxx"
 {
   for (unsigned int i = 0; i < yyvsp[0].u.s_uint; i++) {
     current_packer->pack_uint64(yyvsp[-2].u.uint64);
@@ -1764,7 +1769,7 @@ case 98:
 }
     break;
 case 99:
-#line 718 "dcParser.yxx"
+#line 723 "dcParser.yxx"
 {
   for (unsigned int i = 0; i < yyvsp[0].u.s_uint; i++) {
     current_packer->pack_double(yyvsp[-2].u.real);
@@ -1772,7 +1777,7 @@ case 99:
 }
     break;
 case 100:
-#line 724 "dcParser.yxx"
+#line 729 "dcParser.yxx"
 {
   for (unsigned int i = 0; i < yyvsp[0].u.s_uint; i++) {
     current_packer->pack_literal_value(yyvsp[-2].str);
@@ -1780,199 +1785,199 @@ case 100:
 }
     break;
 case 107:
-#line 748 "dcParser.yxx"
+#line 753 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int8;
 }
     break;
 case 108:
-#line 752 "dcParser.yxx"
+#line 757 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int16;
 }
     break;
 case 109:
-#line 756 "dcParser.yxx"
+#line 761 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int32;
 }
     break;
 case 110:
-#line 760 "dcParser.yxx"
+#line 765 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int64;
 }
     break;
 case 111:
-#line 764 "dcParser.yxx"
+#line 769 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint8;
 }
     break;
 case 112:
-#line 768 "dcParser.yxx"
+#line 773 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint16;
 }
     break;
 case 113:
-#line 772 "dcParser.yxx"
+#line 777 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint32;
 }
     break;
 case 114:
-#line 776 "dcParser.yxx"
+#line 781 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint64;
 }
     break;
 case 115:
-#line 780 "dcParser.yxx"
+#line 785 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_float64;
 }
     break;
 case 116:
-#line 784 "dcParser.yxx"
+#line 789 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_string;
 }
     break;
 case 117:
-#line 788 "dcParser.yxx"
+#line 793 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_blob;
 }
     break;
 case 118:
-#line 792 "dcParser.yxx"
+#line 797 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_blob32;
 }
     break;
 case 119:
-#line 796 "dcParser.yxx"
+#line 801 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int8array;
 }
     break;
 case 120:
-#line 800 "dcParser.yxx"
+#line 805 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int16array;
 }
     break;
 case 121:
-#line 804 "dcParser.yxx"
+#line 809 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_int32array;
 }
     break;
 case 122:
-#line 808 "dcParser.yxx"
+#line 813 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint8array;
 }
     break;
 case 123:
-#line 812 "dcParser.yxx"
+#line 817 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint16array;
 }
     break;
 case 124:
-#line 816 "dcParser.yxx"
+#line 821 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint32array;
 }
     break;
 case 125:
-#line 820 "dcParser.yxx"
+#line 825 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_uint32uint8array;
 }
     break;
 case 126:
-#line 824 "dcParser.yxx"
+#line 829 "dcParser.yxx"
 {
   yyval.u.subatomic = ST_char;
 }
     break;
 case 127:
-#line 831 "dcParser.yxx"
+#line 836 "dcParser.yxx"
 {
   yyval.u.s_int = 0;
 }
     break;
 case 128:
-#line 835 "dcParser.yxx"
+#line 840 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_required;
 }
     break;
 case 129:
-#line 839 "dcParser.yxx"
+#line 844 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_broadcast;
 }
     break;
 case 130:
-#line 843 "dcParser.yxx"
+#line 848 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_p2p;
 }
     break;
 case 131:
-#line 847 "dcParser.yxx"
+#line 852 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_ram;
 }
     break;
 case 132:
-#line 851 "dcParser.yxx"
+#line 856 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_db;
 }
     break;
 case 133:
-#line 855 "dcParser.yxx"
+#line 860 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_clsend;
 }
     break;
 case 134:
-#line 859 "dcParser.yxx"
+#line 864 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_clrecv;
 }
     break;
 case 135:
-#line 863 "dcParser.yxx"
+#line 868 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_ownsend;
 }
     break;
 case 136:
-#line 867 "dcParser.yxx"
+#line 872 "dcParser.yxx"
 {
   yyval.u.s_int = yyvsp[-1].u.s_int | DCAtomicField::F_airecv;
 }
     break;
 case 137:
-#line 874 "dcParser.yxx"
+#line 879 "dcParser.yxx"
 {
   current_molecular = new DCMolecularField(yyvsp[-1].str);
 }
     break;
 case 138:
-#line 878 "dcParser.yxx"
+#line 883 "dcParser.yxx"
 {
   yyval.u.field = current_molecular;
 }
     break;
 case 139:
-#line 885 "dcParser.yxx"
+#line 890 "dcParser.yxx"
 {
   DCField *field = current_class->get_field_by_name(yyvsp[0].str);
   yyval.u.atomic = (DCAtomicField *)NULL;
@@ -1987,7 +1992,7 @@ case 139:
 }
     break;
 case 140:
-#line 901 "dcParser.yxx"
+#line 906 "dcParser.yxx"
 {
   if (yyvsp[0].u.atomic != (DCAtomicField *)NULL) {
     current_molecular->add_atomic(yyvsp[0].u.atomic);
@@ -1995,7 +2000,7 @@ case 140:
 }
     break;
 case 141:
-#line 907 "dcParser.yxx"
+#line 912 "dcParser.yxx"
 {
   if (yyvsp[0].u.atomic != (DCAtomicField *)NULL) {
     current_molecular->add_atomic(yyvsp[0].u.atomic);
@@ -2008,27 +2013,27 @@ case 141:
 }
     break;
 case 142:
-#line 921 "dcParser.yxx"
+#line 926 "dcParser.yxx"
 {
   yyval.str = "";
 }
     break;
 case 144:
-#line 929 "dcParser.yxx"
+#line 934 "dcParser.yxx"
 {
   yyval.u.dswitch = current_switch;
   current_switch = new DCSwitch(yyvsp[-4].str, yyvsp[-2].u.parameter);
 }
     break;
 case 145:
-#line 934 "dcParser.yxx"
+#line 939 "dcParser.yxx"
 {
   yyval.u.dswitch = current_switch;
   current_switch = (DCSwitch *)yyvsp[-2].u.parameter;
 }
     break;
 case 149:
-#line 946 "dcParser.yxx"
+#line 951 "dcParser.yxx"
 {
   if (current_switch->get_num_cases() == 0) {
     yyerror("case declaration required before first element");
@@ -2038,7 +2043,7 @@ case 149:
 }
     break;
 case 150:
-#line 957 "dcParser.yxx"
+#line 962 "dcParser.yxx"
 {
   current_packer = &default_packer;
   current_packer->clear_data();
@@ -2046,7 +2051,7 @@ case 150:
 }
     break;
 case 151:
-#line 963 "dcParser.yxx"
+#line 968 "dcParser.yxx"
 {
   if (!current_packer->end_pack()) {
     yyerror("Invalid value for switch parameter");
@@ -2056,13 +2061,13 @@ case 151:
 }
     break;
 case 152:
-#line 974 "dcParser.yxx"
+#line 979 "dcParser.yxx"
 {
   yyval.u.field = yyvsp[-1].u.parameter;
 }
     break;
 case 153:
-#line 978 "dcParser.yxx"
+#line 983 "dcParser.yxx"
 {
   yyval.u.field = yyvsp[0].u.parameter;
 }
@@ -2300,4 +2305,4 @@ yyreturn:
 #endif
   return yyresult;
 }
-#line 986 "dcParser.yxx"
+#line 991 "dcParser.yxx"
diff --git a/direct/src/dcparser/dcParser.yxx b/direct/src/dcparser/dcParser.yxx
index a8d9d9ebc8..9b2dce5957 100644
--- a/direct/src/dcparser/dcParser.yxx
+++ b/direct/src/dcparser/dcParser.yxx
@@ -202,6 +202,7 @@ dclass_name:
 {
   DCClass *dclass = dc_file->get_class_by_name($1);
   if (dclass == (DCClass *)NULL) {
+    // Create a bogus class as a forward reference.
     dclass = new DCClass($1, false, true);
     dc_file->add_class(dclass);
   }
@@ -474,10 +475,14 @@ type_name:
 }
 	| dclass
 {
+  // This is an inline class definition.
+  dc_file->add_thing_to_delete($1);
   $$ = new DCClassParameter($1);
 }
 	| switch
 {
+  // This is an inline switch definition.
+  dc_file->add_thing_to_delete($1);
   $$ = new DCSwitchParameter($1);
 }
 	;
diff --git a/direct/src/dcparser/dcSimpleParameter.cxx b/direct/src/dcparser/dcSimpleParameter.cxx
index 547c976286..0eaa464393 100644
--- a/direct/src/dcparser/dcSimpleParameter.cxx
+++ b/direct/src/dcparser/dcSimpleParameter.cxx
@@ -312,6 +312,8 @@ set_range(const DCDoubleRange &range) {
   int num_ranges = range.get_num_ranges();
   int i;
 
+  _has_range_limits = (num_ranges != 0);
+
   switch (_type) {
   case ST_int8:
   case ST_int8array:
@@ -1713,7 +1715,10 @@ unpack_string(const char *data, size_t length, size_t &p, string &value,
 ////////////////////////////////////////////////////////////////////
 bool DCSimpleParameter::
 unpack_validate(const char *data, size_t length, size_t &p,
-                bool &pack_error, bool &range_error) const {
+                bool &pack_error, bool &range_error) const { 
+  if (!_has_range_limits) {
+    return unpack_skip(data, length, p, pack_error);
+  }
   switch (_type) {
   case ST_int8:
     {
@@ -1871,7 +1876,8 @@ unpack_validate(const char *data, size_t length, size_t &p,
 //               failure (e.g. we don't know how to skip this field).
 ////////////////////////////////////////////////////////////////////
 bool DCSimpleParameter::
-unpack_skip(const char *data, size_t length, size_t &p) const {
+unpack_skip(const char *data, size_t length, size_t &p, 
+            bool &pack_error) const {
   size_t string_length;
 
   switch (_type) {
@@ -1929,7 +1935,7 @@ unpack_skip(const char *data, size_t length, size_t &p) const {
   }
 
   if (p > length) {
-    return false;
+    pack_error = true;
   }
 
   return true;
@@ -2046,7 +2052,7 @@ generate_hash(HashGenerator &hashgen) const {
 ////////////////////////////////////////////////////////////////////
 DCSimpleParameter *DCSimpleParameter::
 create_nested_field(DCSubatomicType type, unsigned int divisor) {
-  DivisorMap divisor_map = _nested_field_map[type];
+  DivisorMap &divisor_map = _nested_field_map[type];
   DivisorMap::iterator di;
   di = divisor_map.find(divisor);
   if (di != divisor_map.end()) {
diff --git a/direct/src/dcparser/dcSimpleParameter.h b/direct/src/dcparser/dcSimpleParameter.h
index bdb6498ba7..bcef313aae 100644
--- a/direct/src/dcparser/dcSimpleParameter.h
+++ b/direct/src/dcparser/dcSimpleParameter.h
@@ -80,7 +80,8 @@ public:
                              string &value, bool &pack_error, bool &range_error) const;
   virtual bool unpack_validate(const char *data, size_t length, size_t &p, 
                                bool &pack_error, bool &range_error) const;
-  virtual bool unpack_skip(const char *data, size_t length, size_t &p) const;
+  virtual bool unpack_skip(const char *data, size_t length, size_t &p,
+                           bool &pack_error) const;
 
   virtual void output_instance(ostream &out, bool brief, const string &prename, 
                                const string &name, const string &postname) const;
diff --git a/direct/src/dcparser/dcSwitch.cxx b/direct/src/dcparser/dcSwitch.cxx
index 8c91efc4de..c970aeb987 100644
--- a/direct/src/dcparser/dcSwitch.cxx
+++ b/direct/src/dcparser/dcSwitch.cxx
@@ -378,6 +378,29 @@ SwitchCase(const string &name, const string &value) :
   _has_fixed_byte_size = true;
   _fixed_byte_size = 0;
   _has_fixed_structure = true;
+  _has_range_limits = false;
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: DCSwitch::SwitchCase::Destructor
+//       Access: Public
+//  Description: 
+////////////////////////////////////////////////////////////////////
+DCSwitch::SwitchCase::
+~SwitchCase() {
+  Fields::iterator fi = _fields.begin();
+  
+  // Be careful not to delete the _key_parameter, which is added to
+  // the beginning of each case.
+  nassertv(fi != _fields.end());
+  ++fi;
+
+  // But we do want to delete all of the other fields.
+  while (fi != _fields.end()) {
+    delete (*fi);
+    ++fi;
+  }
+  _fields.clear();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -423,5 +446,8 @@ add_field(DCField *field) {
   if (_has_fixed_structure) {
     _has_fixed_structure = field->has_fixed_structure();
   }
+  if (!_has_range_limits) {
+    _has_range_limits = field->has_range_limits();
+  }
   return true;
 }
diff --git a/direct/src/dcparser/dcSwitch.h b/direct/src/dcparser/dcSwitch.h
index f1bff04117..192f1f3697 100644
--- a/direct/src/dcparser/dcSwitch.h
+++ b/direct/src/dcparser/dcSwitch.h
@@ -78,6 +78,7 @@ private:
   class SwitchCase : public DCPackerInterface {
   public:
     SwitchCase(const string &name, const string &value);
+    ~SwitchCase();
     virtual DCPackerInterface *get_nested_field(int n) const;
 
     bool add_field(DCField *field);
diff --git a/direct/src/dcparser/dcSwitchParameter.cxx b/direct/src/dcparser/dcSwitchParameter.cxx
index c368d844f5..7054819b6b 100755
--- a/direct/src/dcparser/dcSwitchParameter.cxx
+++ b/direct/src/dcparser/dcSwitchParameter.cxx
@@ -26,12 +26,13 @@
 //  Description: 
 ////////////////////////////////////////////////////////////////////
 DCSwitchParameter::
-DCSwitchParameter(DCSwitch *dswitch) :
+DCSwitchParameter(const DCSwitch *dswitch) :
   _dswitch(dswitch)
 {
   set_name(dswitch->get_name());
 
-  _has_fixed_byte_size = false;
+  _has_fixed_byte_size = true;
+  _fixed_byte_size = 0;
   _has_fixed_structure = false;
 
   // The DCSwitch presents just one nested field initially, which is
@@ -44,30 +45,27 @@ DCSwitchParameter(DCSwitch *dswitch) :
   _pack_type = PT_switch;
 
   DCParameter *key_parameter = dswitch->get_key_parameter();
-  if (key_parameter->has_fixed_byte_size()) {
-    // See if we have a fixed byte size for the overall switch.  This
-    // will be true only if all of the individual cases have the same
-    // fixed byte size.
-    int num_cases = _dswitch->get_num_cases();
-    _has_fixed_byte_size = true;
-    _fixed_byte_size = 0;
+  _has_fixed_byte_size = _has_fixed_byte_size && key_parameter->has_fixed_byte_size();
+  _has_range_limits = _has_range_limits || key_parameter->has_range_limits();
 
-    if (num_cases > 0) {
-      _fixed_byte_size = _dswitch->get_case(0)->get_fixed_byte_size();
-
-      for (int i = 0; i < num_cases && _has_fixed_byte_size; i++) {
-        const DCPackerInterface *dcase = _dswitch->get_case(i);
-        if (!dcase->has_fixed_byte_size() || 
-            dcase->get_fixed_byte_size() != _fixed_byte_size) {
-          
-          // Nope, we have a variable byte size.
-          _has_fixed_byte_size = false;
-        }
+  int num_cases = _dswitch->get_num_cases();
+  if (num_cases > 0) {
+    _fixed_byte_size = _dswitch->get_case(0)->get_fixed_byte_size();
+    
+    for (int i = 0; i < num_cases; i++) {
+      const DCPackerInterface *dcase = _dswitch->get_case(i);
+      if (!dcase->has_fixed_byte_size() || 
+          dcase->get_fixed_byte_size() != _fixed_byte_size) {
+        
+        // Nope, we have a variable byte size.
+        _has_fixed_byte_size = false;
       }
-    }
 
-    _fixed_byte_size += key_parameter->get_fixed_byte_size();
+      _has_range_limits = _has_range_limits || dcase->has_range_limits();
+    }
   }
+
+  _fixed_byte_size += key_parameter->get_fixed_byte_size();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -119,7 +117,7 @@ is_valid() const {
 //       Access: Published
 //  Description: Returns the switch object this parameter represents.
 ////////////////////////////////////////////////////////////////////
-DCSwitch *DCSwitchParameter::
+const DCSwitch *DCSwitchParameter::
 get_switch() const {
   return _dswitch;
 }
diff --git a/direct/src/dcparser/dcSwitchParameter.h b/direct/src/dcparser/dcSwitchParameter.h
index 30de81ff59..190c4d885c 100755
--- a/direct/src/dcparser/dcSwitchParameter.h
+++ b/direct/src/dcparser/dcSwitchParameter.h
@@ -32,7 +32,7 @@ class DCSwitch;
 ////////////////////////////////////////////////////////////////////
 class EXPCL_DIRECT DCSwitchParameter : public DCParameter {
 public:
-  DCSwitchParameter(DCSwitch *dswitch);
+  DCSwitchParameter(const DCSwitch *dswitch);
   DCSwitchParameter(const DCSwitchParameter &copy);
 
 PUBLISHED:
@@ -40,7 +40,7 @@ PUBLISHED:
   virtual DCParameter *make_copy() const;
   virtual bool is_valid() const;
 
-  DCSwitch *get_switch() const;
+  const DCSwitch *get_switch() const;
 
 public:
   virtual DCPackerInterface *get_nested_field(int n) const;
@@ -55,7 +55,7 @@ public:
   virtual void generate_hash(HashGenerator &hashgen) const;
 
 private:
-  DCSwitch *_dswitch;
+  const DCSwitch *_dswitch;
 };
 
 #endif
diff --git a/direct/src/dcparser/dcTypedef.cxx b/direct/src/dcparser/dcTypedef.cxx
index 8746f45ce2..6465b82de2 100644
--- a/direct/src/dcparser/dcTypedef.cxx
+++ b/direct/src/dcparser/dcTypedef.cxx
@@ -24,7 +24,9 @@
 ////////////////////////////////////////////////////////////////////
 //     Function: DCTypedef::Constructor
 //       Access: Public
-//  Description:
+//  Description: The DCTypedef object becomes the owner of the
+//               supplied parameter pointer and will delete it upon
+//               destruction.
 ////////////////////////////////////////////////////////////////////
 DCTypedef::
 DCTypedef(DCParameter *parameter, bool implicit) :