Allow parsing of streams with extra whitespaces (#51)

Fixes #50

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.1
+
+- Fix parsing PDFs where stream or startxref ends with extra whitespace (#50)
+
 ## 0.5.0
 
 - Add support for web by using the archive package. (#48)

lib/src/parser/pdf_object_parser.dart

@@ -254,8 +254,8 @@ class PDFObjectParser {
   }
 
   Future<PDFStreamObject?> _parseStream(PDFDictionary dictionary) async {
-    final line = await ReaderHelper.readLine(_buffer);
-    if ('tartxref' == line) return null;
+    final line = (await ReaderHelper.readLine(_buffer))?.trim();
+    if (line == 'tartxref') return null;
     assert('tream' == line);
 
     var object = dictionary[PDFNames.length];

pubspec.yaml

@@ -1,6 +1,6 @@
 name: dart_pdf_reader
 description: Small pure-dart library for parsing PDF files. Supports reading all pdf structures
-version: 0.5.0
+version: 0.5.1
 repository: https://github.com/NicolaVerbeeck/dart_pdf_reader
 issue_tracker: https://github.com/NicolaVerbeeck/dart_pdf_reader/issues
 topics: [pdf, parser]
@@ -17,6 +17,6 @@ dependencies:
 dev_dependencies:
   lints: ">=2.0.0 <4.0.0"
   test: ^1.21.0
-  dcli: ^3.0.2
+  dcli: ^3.2.4
   mocktail: ^1.0.0
   convert: ^3.1.1

test/parser/pdf_stream_parser.dart

@@ -52,5 +52,31 @@ void streamParserTests() {
       final raw = await stream.readRaw();
       expect(raw, [97, 98, 99]);
     });
+    test('Test stream extra space, with data', () async {
+      final stream =
+          await createParserFromString('<</Length 3>>stream \nabcendstream')
+              .parse();
+      expect(stream, isA<PDFStreamObject>());
+
+      stream as PDFStreamObject;
+      expect(stream.dictionary.entries, {
+        const PDFName('Length'): const PDFNumber(3),
+      });
+      expect(stream.length, 3);
+      expect(stream.offset, 21);
+      final raw = await stream.readRaw();
+      expect(raw, [97, 98, 99]);
+    });
+    test('Test startxref keyword having trailing whitespace', () async {
+      final stream =
+          await createParserFromString('<</Length 3>>startxref \nabcendstream')
+              .parse();
+      expect(stream, isA<PDFDictionary>());
+
+      stream as PDFDictionary;
+      expect(stream.entries, {
+        const PDFName('Length'): const PDFNumber(3),
+      });
+    });
   });
 }