Improve PdfObjectBase

@@ -42,6 +42,10 @@ class PdfObjectBase<T extends PdfDataType> with PdfDiagnostic {
     required this.objser,
     this.objgen = 0,
     required this.params,
+    this.deflate,
+    this.encryptCallback,
+    this.verbose = false,
+    this.version = PdfVersion.pdf_1_5,
   });
 
   /// This is the unique serial number for this object.
@@ -53,23 +57,44 @@ class PdfObjectBase<T extends PdfDataType> with PdfDiagnostic {
   final T params;
 
   /// Callback used to compress the data
-  DeflateCallback? get deflate => null;
+  final DeflateCallback? deflate;
 
   /// Callback used to encrypt the value of a [PdfDictStream] or a [PdfEncStream]
-  PdfEncryptCallback? get encryptCallback => null;
+  final PdfEncryptCallback? encryptCallback;
 
   /// Output a PDF document with comments and formatted data
-  bool get verbose => false;
+  final bool verbose;
 
-  PdfVersion get version => PdfVersion.pdf_1_5;
+  /// PDF version to generate
+  final PdfVersion version;
 
   /// Returns the unique serial number in Pdf format
   PdfIndirect ref() => PdfIndirect(objser, objgen);
 
-  void output(PdfStream s) {
+  int output(PdfStream s) {
+    assert(() {
+      if (verbose) {
+        setInsertion(s, 160);
+        startStopwatch();
+      }
+      return true;
+    }());
+
+    final offset = s.offset;
     s.putString('$objser $objgen obj\n');
     writeContent(s);
     s.putString('endobj\n');
+
+    assert(() {
+      if (verbose) {
+        stopStopwatch();
+        debugFill(
+            'Creation time: ${elapsedStopwatch / Duration.microsecondsPerSecond} seconds');
+        writeDebug(s);
+      }
+      return true;
+    }());
+    return offset;
   }
 
   void writeContent(PdfStream s) {

@@ -144,24 +144,8 @@ class PdfXrefTable extends PdfDataType with PdfDiagnostic {
     }());
 
     for (final ob in objects) {
-      assert(() {
-        if (ob.verbose) {
-          ob.setInsertion(s, 150);
-          ob.startStopwatch();
-        }
-        return true;
-      }());
-      _offsets.add(PdfXref(ob.objser, s.offset, generation: ob.objgen));
-      ob.output(s);
-      assert(() {
-        if (ob.verbose) {
-          ob.stopStopwatch();
-          ob.debugFill(
-              'Creation time: ${ob.elapsedStopwatch / Duration.microsecondsPerSecond} seconds');
-          ob.writeDebug(s);
-        }
-        return true;
-      }());
+      final offset = ob.output(s);
+      _offsets.add(PdfXref(ob.objser, offset, generation: ob.objgen));
     }
 
     final int xrefOffset;
@@ -195,7 +179,6 @@ class PdfXrefTable extends PdfDataType with PdfDiagnostic {
         debugFill(
             'Creation time: ${elapsedStopwatch / Duration.microsecondsPerSecond} seconds');
         debugFill('File size: ${s.offset} bytes');
-        // debugFill('Pages: ${rootID!.pdfDocument.pdfPageList.pages.length}');
         debugFill('Objects: ${objects.length}');
         writeDebug(s);
       }
@@ -337,16 +320,19 @@ class PdfXrefTable extends PdfDataType with PdfDiagnostic {
 
     final objOffset = s.offset;
 
-    s.putString('$id 0 obj\n');
+    PdfObjectBase(
+      objser: id,
+      params: PdfDictStream(
+        data: binOffsets.buffer.asUint8List(),
+        isBinary: false,
+        encrypt: false,
+        values: params.values,
+      ),
+      deflate: o.deflate,
+      verbose: o.verbose,
+      version: o.version,
+    ).output(s);
 
-    PdfDictStream(
-      data: binOffsets.buffer.asUint8List(),
-      isBinary: false,
-      encrypt: false,
-      values: params.values,
-    ).output(o, s, o.verbose ? 0 : null);
-
-    s.putString('\nendobj\n');
     return objOffset;
   }
 }

@@ -82,12 +82,13 @@ class PdfSignature extends PdfObjectDict {
   int? _offsetEnd;
 
   @override
-  void output(PdfStream s) {
+  int output(PdfStream s) {
     value.preSign(this, params);
 
     _offsetStart = s.offset + '$objser $objgen obj\n'.length;
-    super.output(s);
+    final offset = super.output(s);
     _offsetEnd = s.offset;
+    return offset;
   }
 
   Future<void> writeSignature(PdfStream os) async {

@@ -21,38 +21,33 @@ import 'package:pdf/pdf.dart';
 import 'package:pdf/src/priv.dart';
 import 'package:test/test.dart';
 
-class BasicObject<T extends PdfDataType> extends PdfObjectBase<T> {
-  BasicObject({required super.objser, required super.params});
-
-  @override
-  bool get verbose => true;
-
-  @override
-  PdfVersion get version => PdfVersion.pdf_1_4;
-
-  @override
-  DeflateCallback? get deflate => zlib.encode;
-}
-
 void main() {
   test('Pdf Minimal', () async {
     var objser = 1;
+    const verbose = true;
+    const version = PdfVersion.pdf_1_4;
 
-    final pages = BasicObject(
+    final pages = PdfObjectBase(
         objser: objser++,
+        verbose: verbose,
+        version: version,
         params: PdfDict({
           '/Type': const PdfName('/Pages'),
           '/Count': const PdfNum(1),
         }));
 
-    final content = BasicObject(
+    final content = PdfObjectBase(
         objser: objser++,
+        verbose: verbose,
+        version: version,
         params: PdfDictStream(
           data: latin1.encode('30 811.88976 m 200 641.88976 l S'),
         ));
 
-    final page = BasicObject(
+    final page = PdfObjectBase(
         objser: objser++,
+        verbose: verbose,
+        version: version,
         params: PdfDict({
           '/Type': const PdfName('/Page'),
           '/Parent': pages.ref(),
@@ -67,8 +62,10 @@ void main() {
 
     pages.params['/Kids'] = PdfArray([page.ref()]);
 
-    final catalog = BasicObject(
+    final catalog = PdfObjectBase(
         objser: objser++,
+        verbose: verbose,
+        version: version,
         params: PdfDict({
           '/Type': const PdfName('/Catalog'),
           '/Pages': pages.ref(),