Generalize PdfObject

@@ -17,24 +17,15 @@
 import 'data_types.dart';
 import 'document.dart';
 import 'object.dart';
-import 'stream.dart';
 
 /// An array object
-class PdfArrayObject extends PdfObject {
+class PdfArrayObject extends PdfObject<PdfArray> {
   /// Creates an array object
   PdfArrayObject(
     PdfDocument pdfDocument,
-    this.array,
-  ) : super(pdfDocument);
+    PdfArray array,
+  ) : super(pdfDocument, params: array);
 
   /// The array
-  final PdfArray array;
-
-  @override
-  void writeContent(PdfStream os) {
-    super.writeContent(os);
-
-    array.output(os);
-    os.putBytes(<int>[0x0a]);
-  }
+  PdfArray get array => params;
 }

@@ -17,7 +17,7 @@
 import 'annotation.dart';
 import 'data_types.dart';
 import 'document.dart';
-import 'object.dart';
+import 'object_dict.dart';
 
 /// Border style
 enum PdfBorderStyle {
@@ -40,7 +40,7 @@ enum PdfBorderStyle {
 }
 
 /// Defines a border object
-class PdfBorder extends PdfObject {
+class PdfBorder extends PdfObjectDict {
   /// Creates a border using the predefined styles in [PdfAnnot].
   PdfBorder(
     PdfDocument pdfDocument,

@@ -18,7 +18,6 @@ import 'annotation.dart';
 import 'data_types.dart';
 import 'document.dart';
 import 'names.dart';
-import 'object.dart';
 import 'object_dict.dart';
 import 'outline.dart';
 import 'page_list.dart';

@@ -18,9 +18,10 @@ import 'dart:typed_data';
 
 import 'document.dart';
 import 'object.dart';
+import 'object_dict.dart';
 
 /// Encryption object
-abstract class PdfEncryption extends PdfObject {
+abstract class PdfEncryption extends PdfObjectDict {
   /// Creates an encryption object
   PdfEncryption(PdfDocument pdfDocument) : super(pdfDocument);
 

@@ -15,7 +15,6 @@
  */
 
 import 'data_types.dart';
-import 'object.dart';
 import 'object_dict.dart';
 import 'object_stream.dart';
 import 'ttffont.dart';

@@ -17,10 +17,10 @@
 import 'color.dart';
 import 'data_types.dart';
 import 'document.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'object_stream.dart';
 
-abstract class PdfBaseFunction extends PdfObject {
+abstract class PdfBaseFunction extends PdfObjectDict {
   PdfBaseFunction(PdfDocument pdfDocument) : super(pdfDocument);
 
   factory PdfBaseFunction.colorsAndStops(

@@ -21,7 +21,7 @@ import 'package:meta/meta.dart';
 import 'data_types.dart';
 import 'document.dart';
 import 'function.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'smask.dart';
 
 enum PdfBlendMode {
@@ -159,7 +159,7 @@ class PdfGraphicState {
 }
 
 /// Stores all the graphic states used in the document
-class PdfGraphicStates extends PdfObject {
+class PdfGraphicStates extends PdfObjectDict {
   /// Create a new Graphic States object
   PdfGraphicStates(PdfDocument pdfDocument) : super(pdfDocument);
 

@@ -18,13 +18,13 @@ import 'data_types.dart';
 import 'document.dart';
 import 'font.dart';
 import 'graphic_state.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'pattern.dart';
 import 'shading.dart';
 import 'xobject.dart';
 
 /// Helper functions for graphic objects
-mixin PdfGraphicStream on PdfObject {
+mixin PdfGraphicStream on PdfObjectDict {
   /// Isolated transparency: If this flag is true, objects within the group
   /// shall be composited against a fully transparent initial backdrop;
   /// if false, they shall be composited against the group’s backdrop

@@ -16,10 +16,10 @@
 
 import 'data_types.dart';
 import 'document.dart';
-import 'object.dart';
+import 'object_dict.dart';
 
 /// Information object
-class PdfInfo extends PdfObject {
+class PdfInfo extends PdfObjectDict {
   /// Create an information object
   PdfInfo(PdfDocument pdfDocument,
       {this.title,

@@ -16,11 +16,11 @@
 
 import 'data_types.dart';
 import 'document.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'page.dart';
 
 /// Pdf Name object
-class PdfNames extends PdfObject {
+class PdfNames extends PdfObjectDict {
   /// This constructs a Pdf Name object
   PdfNames(PdfDocument pdfDocument) : super(pdfDocument);
 

@@ -21,12 +21,12 @@ import 'document.dart';
 import 'stream.dart';
 
 /// Base Object used in the PDF file
-class PdfObject {
+abstract class PdfObject<T extends PdfDataType> {
   /// This is usually called by extensors to this class, and sets the
   /// Pdf Object Type
   PdfObject(
     this.pdfDocument, {
-    // String? type,
+    required this.params,
     this.objgen = 0,
     int? objser,
   }) : objser = objser ?? pdfDocument.genSerial() {
@@ -34,7 +34,7 @@ class PdfObject {
   }
 
   /// This is the object parameters.
-  final PdfDict params = PdfDict();
+  final T params;
 
   /// This is the unique serial number for this object.
   final int objser;
@@ -64,10 +64,8 @@ class PdfObject {
   }
 
   void writeContent(PdfStream os) {
-    if (params.isNotEmpty) {
     params.output(os);
-      os.putString('\n');
-    }
+    os.putByte(0x0a);
   }
 
   /// The write method should call this after writing anything to the

@@ -17,9 +17,10 @@
 import 'data_types.dart';
 import 'document.dart';
 import 'object.dart';
+import 'stream.dart';
 
 /// Object with a PdfDict used in the PDF file
-class PdfObjectDict extends PdfObject {
+class PdfObjectDict extends PdfObject<PdfDict> {
   /// This is usually called by extensors to this class, and sets the
   /// Pdf Object Type
   PdfObjectDict(
@@ -27,15 +28,17 @@ class PdfObjectDict extends PdfObject {
     String? type,
     int objgen = 0,
     int? objser,
-  }) : super(pdfDocument, objgen: objgen, objser: objser) {
+  }) : super(pdfDocument, params: PdfDict(), objgen: objgen, objser: objser) {
     if (type != null) {
       params['/Type'] = PdfName(type);
     }
   }
 
-  /// This is the object parameters.
-  final PdfDict params = PdfDict();
-
   @override
-  String toString() => '$runtimeType $params';
+  void writeContent(PdfStream os) {
+    if (params.isNotEmpty) {
+      params.output(os);
+      os.putByte(0x0a);
+    }
+  }
 }

@@ -14,9 +14,6 @@
  * limitations under the License.
  */
 
-import 'dart:typed_data';
-
-import 'ascii85.dart';
 import 'data_types.dart';
 import 'document.dart';
 import 'object_dict.dart';
@@ -37,47 +34,13 @@ class PdfObjectStream extends PdfObjectDict {
   /// defines if the stream needs to be converted to ascii85
   final bool isBinary;
 
-  Uint8List? _data;
-
-  @override
-  void prepare() {
-    super.prepare();
-
-    if (params.containsKey('/Filter') && _data == null) {
-      // The data is already in the right format
-      _data = buf.output();
-    } else if (pdfDocument.deflate != null) {
-      final original = buf.output();
-      final newData = Uint8List.fromList(pdfDocument.deflate!(original));
-      if (newData.lengthInBytes < original.lengthInBytes) {
-        params['/Filter'] = const PdfName('/FlateDecode');
-        _data = newData;
-      }
-    }
-
-    if (_data == null) {
-      if (isBinary) {
-        // This is an Ascii85 stream
-        final e = Ascii85Encoder();
-        _data = e.convert(buf.output());
-        params['/Filter'] = const PdfName('/ASCII85Decode');
-      } else {
-        // This is a non-deflated stream
-        _data = buf.output();
-      }
-    }
-    if (pdfDocument.encryption != null) {
-      _data = pdfDocument.encryption!.encrypt(_data!, this);
-    }
-    params['/Length'] = PdfNum(_data!.length);
-  }
-
   @override
   void writeContent(PdfStream os) {
-    super.writeContent(os);
-
-    os.putString('stream\n');
-    os.putBytes(_data!);
-    os.putString('\nendstream\n');
+    PdfDictStream(
+      object: this,
+      isBinary: isBinary,
+      values: params.values,
+      data: buf.output(),
+    ).output(os);
   }
 }

@@ -17,7 +17,7 @@
 import 'color.dart';
 import 'data_types.dart';
 import 'document.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'page.dart';
 import 'rect.dart';
 
@@ -46,7 +46,7 @@ enum PdfOutlineStyle {
 }
 
 /// Pdf Outline object
-class PdfOutline extends PdfObject {
+class PdfOutline extends PdfObjectDict {
   /// Constructs a Pdf Outline object.
   /// When selected, the specified region is displayed.
   PdfOutline(

@@ -19,10 +19,10 @@ import 'package:vector_math/vector_math_64.dart';
 import 'data_types.dart';
 import 'document.dart';
 import 'graphic_state.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'shading.dart';
 
-abstract class PdfPattern extends PdfObject {
+abstract class PdfPattern extends PdfObjectDict {
   PdfPattern(PdfDocument pdfDocument, this.patternType, this.matrix)
       : super(pdfDocument);
 

@@ -17,13 +17,13 @@
 import 'data_types.dart';
 import 'document.dart';
 import 'function.dart';
-import 'object.dart';
+import 'object_dict.dart';
 import 'point.dart';
 import 'rect.dart';
 
 enum PdfShadingType { axial, radial }
 
-class PdfShading extends PdfObject {
+class PdfShading extends PdfObjectDict {
   PdfShading(
     PdfDocument pdfDocument, {
     required this.shadingType,