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LokeshPalani
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Added missed files in the pdf
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‎packages/syncfusion_flutter_pdf/lib/src/pdf/implementation/annotations/fdf_document.dart

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import 'dart:convert';
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import '../../interfaces/pdf_interface.dart';
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import '../io/pdf_constants.dart';
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import '../io/pdf_cross_table.dart';
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import '../pages/pdf_page.dart';
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import '../primitives/pdf_array.dart';
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import '../primitives/pdf_boolean.dart';
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import '../primitives/pdf_dictionary.dart';
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import '../primitives/pdf_name.dart';
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import '../primitives/pdf_number.dart';
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import '../primitives/pdf_reference_holder.dart';
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import '../primitives/pdf_stream.dart';
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import '../primitives/pdf_string.dart';
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/// Internal class
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class FdfDocument {
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/// Internal Consturctor
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FdfDocument(this.dictionary, this.page);
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/// Internal field
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late PdfDictionary dictionary;
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/// Internal field
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late PdfPage page;
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/// Internal field
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String _annotationID = '';
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/// Internal method
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Map<String, dynamic> exportAnnotations(
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int currentID, List<String> annotID, int pageIndex, bool hasAppearance) {
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const String startObject =
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'${PdfOperators.whiteSpace}0${PdfOperators.whiteSpace}${PdfOperators.obj}${PdfOperators.newLine}';
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const String endObject =
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PdfOperators.newLine + PdfOperators.endobj + PdfOperators.newLine;
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PdfDictionary dictionary = this.dictionary;
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_annotationID = currentID.toString();
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final List<int> exportData = <int>[];
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exportData.addAll(utf8.encode('$currentID$startObject<<'));
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final Map<int, IPdfPrimitive> subDictionaries = <int, IPdfPrimitive>{};
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final List<int> streamReferences = <int>[];
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annotID.add(_annotationID);
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dictionary.items![PdfName('Page')] = PdfNumber(pageIndex);
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Map<String, dynamic> exportDataDictionary = _getEntriesInDictionary(
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subDictionaries,
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streamReferences,
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currentID,
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dictionary,
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hasAppearance);
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exportData.addAll(exportDataDictionary['exportData'] as List<int>);
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currentID = exportDataDictionary['currentID'] as int;
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dictionary.remove('Page');
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exportData.addAll(utf8.encode('>>$endObject'));
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while (subDictionaries.isNotEmpty) {
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final List<int> keys = subDictionaries.keys.toList();
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for (final int key in keys) {
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if (subDictionaries[key] is PdfDictionary) {
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dictionary = subDictionaries[key]! as PdfDictionary;
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if (dictionary.containsKey(PdfDictionaryProperties.type)) {
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final IPdfPrimitive? name =
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dictionary[PdfDictionaryProperties.type];
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if (name != null &&
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name is PdfName &&
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name.name == PdfDictionaryProperties.annot) {
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annotID.add(key.toString());
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dictionary.items![PdfName('Page')] = PdfNumber(pageIndex);
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}
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}
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exportData.addAll(utf8.encode('$key$startObject<<'));
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exportDataDictionary = _getEntriesInDictionary(subDictionaries,
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streamReferences, currentID, dictionary, hasAppearance);
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exportData.addAll(exportDataDictionary['exportData'] as List<int>);
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currentID = exportDataDictionary['currentID'] as int;
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if (dictionary.containsKey('Page')) {
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dictionary.remove('Page');
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}
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exportData.addAll(utf8.encode('>>'));
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if (streamReferences.contains(key)) {
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exportData.addAll(_appendStream(subDictionaries[key]!));
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}
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exportData.addAll(utf8.encode(endObject));
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} else if (subDictionaries[key] is PdfName) {
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final PdfName name = subDictionaries[key]! as PdfName;
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exportData.addAll(utf8.encode('$key$startObject$name$endObject'));
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} else if (subDictionaries[key] is PdfArray) {
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final PdfArray array = subDictionaries[key]! as PdfArray;
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exportData.addAll(utf8.encode('$key$startObject'));
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final Map<String, dynamic> result = _appendArrayElements(array,
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currentID, hasAppearance, subDictionaries, streamReferences);
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exportData.addAll(result['exportData'] as List<int>);
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currentID = result['currentID'] as int;
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exportData.addAll(utf8.encode(endObject));
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} else if (subDictionaries[key] is PdfBoolean) {
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final PdfBoolean boolean = subDictionaries[key]! as PdfBoolean;
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exportData.addAll(utf8.encode(
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'$key$startObject${boolean.value! ? 'true' : 'false'}$endObject'));
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} else if (subDictionaries[key] is PdfString) {
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final PdfString data = subDictionaries[key]! as PdfString;
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if (data.value != null) {
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exportData.addAll(utf8.encode(
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'$key$startObject(${_getFormattedStringFDF(data.value!)})$endObject'));
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}
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}
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subDictionaries.remove(key);
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}
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}
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currentID++;
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return <String, dynamic>{'exportData': exportData, 'currentID': currentID};
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}
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/// Internal method
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List<int> _appendStream(IPdfPrimitive stream) {
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final List<int> streamData = <int>[];
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if (stream is PdfStream &&
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stream.dataStream != null &&
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stream.dataStream!.isNotEmpty) {
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streamData.addAll(utf8.encode('stream${PdfOperators.newLine}'));
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streamData.addAll(stream.dataStream!);
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streamData.addAll(utf8.encode('${PdfOperators.newLine}endstream'));
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}
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return streamData;
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}
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Map<String, dynamic> _getEntriesInDictionary(
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Map<int, IPdfPrimitive> dictionaries,
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List<int> streamReferences,
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int currentID,
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PdfDictionary dictionary,
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bool hasAppearance) {
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final List<int> annotationData = <int>[];
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bool isStream = false;
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final List<PdfName?> keys = dictionary.items!.keys.toList();
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for (final PdfName? key in keys) {
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if (!hasAppearance && key!.name == PdfDictionaryProperties.ap) {
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continue;
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}
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if (key!.name != PdfDictionaryProperties.p) {
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annotationData.addAll(utf8.encode(key.toString()));
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}
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if (key.name == 'Sound' ||
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key.name == PdfDictionaryProperties.f ||
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hasAppearance) {
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isStream = true;
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}
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final IPdfPrimitive? primitive = dictionary[key];
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if (primitive is PdfString) {
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if (primitive.value != null) {
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annotationData.addAll(
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utf8.encode('(${_getFormattedStringFDF(primitive.value!)})'));
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}
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} else if (primitive is PdfName) {
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annotationData.addAll(utf8.encode(primitive.toString()));
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} else if (primitive is PdfArray) {
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final Map<String, dynamic> result = _appendArrayElements(
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primitive, currentID, isStream, dictionaries, streamReferences);
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annotationData.addAll(result['exportData'] as List<int>);
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currentID = result['currentID'] as int;
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} else if (primitive is PdfNumber) {
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annotationData.addAll(utf8.encode(' ${primitive.value!}'));
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} else if (primitive is PdfBoolean) {
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annotationData.addAll(utf8.encode(' ${primitive.value!}'));
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} else if (primitive is PdfDictionary) {
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annotationData.addAll(utf8.encode('<<'));
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final Map<String, dynamic> data = _getEntriesInDictionary(dictionaries,
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streamReferences, currentID, primitive, hasAppearance);
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annotationData.addAll(data['exportData'] as List<int>);
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currentID = data['currentID'] as int;
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annotationData.addAll(utf8.encode('>>'));
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} else if (primitive is PdfReferenceHolder) {
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if (PdfPageHelper.getHelper(page).document != null) {
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final int pageNumber =
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PdfPageHelper.getHelper(page).document!.pages.indexOf(page);
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if (key.name == PdfDictionaryProperties.parent) {
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annotationData.addAll(utf8.encode(' $_annotationID 0 R'));
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annotationData.addAll(utf8.encode('/Page $pageNumber'));
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} else if (key.name == PdfDictionaryProperties.irt) {
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if (primitive.object != null && primitive.object is PdfDictionary) {
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final IPdfPrimitive? inReplyTo = primitive.object;
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if (inReplyTo != null &&
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inReplyTo is PdfDictionary &&
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inReplyTo.containsKey('NM')) {
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final IPdfPrimitive? name =
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PdfCrossTable.dereference(inReplyTo['NM']);
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if (name != null && name is PdfString) {
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if (name.value != null) {
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annotationData.addAll(utf8
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.encode('(${_getFormattedStringFDF(name.value!)})'));
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}
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}
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}
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}
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} else if (key.name != PdfDictionaryProperties.p) {
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currentID++;
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annotationData.addAll(utf8.encode(' $currentID 0 R'));
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if (isStream) {
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streamReferences.add(currentID);
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}
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if (primitive.object != null) {
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dictionaries[currentID] = primitive.object!;
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}
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}
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}
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}
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isStream = false;
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}
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return <String, dynamic>{
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'exportData': annotationData,
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'currentID': currentID
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};
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}
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String _getFormattedStringFDF(String value) {
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String result = '';
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for (int i = 0; i < value.length; i++) {
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final int c = value.codeUnitAt(i);
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if (c == 40 || c == 41) {
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result += r'\';
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}
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if (c == 13 || c == 10) {
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if (c == 13) {
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result += r'\r';
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}
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if (c == 10) {
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result += r'\n';
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}
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continue;
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}
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result += String.fromCharCode(c);
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}
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return result;
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}
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Map<String, dynamic> _appendArrayElements(
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PdfArray array,
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int currentID,
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bool isStream,
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Map<int, IPdfPrimitive> dictionaries,
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List<int> streamReferences) {
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final List<int> arrayData = <int>[];
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arrayData.addAll(utf8.encode('['));
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if (array.elements.isNotEmpty) {
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final int count = array.elements.length;
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for (int i = 0; i < count; i++) {
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final IPdfPrimitive? element = array.elements[i];
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if (i != 0 &&
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element != null &&
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(element is PdfNumber ||
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element is PdfReferenceHolder ||
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element is PdfBoolean)) {
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arrayData.addAll(utf8.encode(' '));
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}
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final Map<String, dynamic> result = _appendElement(
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element!, currentID, isStream, dictionaries, streamReferences);
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arrayData.addAll(result['exportData'] as List<int>);
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currentID = result['currentID'] as int;
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}
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}
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arrayData.addAll(utf8.encode(']'));
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return <String, dynamic>{'exportData': arrayData, 'currentID': currentID};
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}
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Map<String, dynamic> _appendElement(
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IPdfPrimitive element,
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int currentID,
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bool isStream,
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Map<int, IPdfPrimitive> dictionaries,
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List<int> streamReferences) {
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final List<int> exportData = <int>[];
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if (element is PdfNumber) {
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exportData.addAll(utf8.encode(element.value!.toString()));
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} else if (element is PdfName) {
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exportData.addAll(utf8.encode(element.toString()));
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} else if (element is PdfString) {
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if (element.value != null) {
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exportData
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.addAll(utf8.encode('(${_getFormattedStringFDF(element.value!)})'));
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}
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} else if (element is PdfBoolean) {
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exportData.addAll(utf8.encode(element.value!.toString()));
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} else if (element is PdfReferenceHolder) {
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currentID++;
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if (isStream) {
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streamReferences.add(currentID);
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}
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if (element.object != null) {
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dictionaries[currentID] = element.object!;
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}
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exportData.addAll(utf8.encode('$currentID 0 R'));
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} else if (element is PdfArray) {
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final Map<String, dynamic> result = _appendArrayElements(
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element, currentID, isStream, dictionaries, streamReferences);
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currentID = result['currentID'] as int;
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exportData.addAll(result['exportData'] as List<int>);
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} else if (element is PdfDictionary) {
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exportData.addAll(utf8.encode('<<'));
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final Map<String, dynamic> data = _getEntriesInDictionary(
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dictionaries, streamReferences, currentID, element, isStream);
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exportData.addAll(data['exportData'] as List<int>);
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currentID = data['currentID'] as int;
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exportData.addAll(utf8.encode('>>'));
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}
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return <String, dynamic>{'exportData': exportData, 'currentID': currentID};
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}
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}

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