do not assume color space is present when analyzing document images

gradle.properties

@@ -1,3 +1,3 @@
 group = org.xbib.graphics
 name = graphics
-version = 5.6.0
+version = 5.6.1

graphics-pdfbox/src/main/java/org/xbib/graphics/pdfbox/analyze/DocumentAnalyzer.java

@@ -10,6 +10,7 @@ import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.pdmodel.PDResources;
 import org.apache.pdfbox.pdmodel.common.PDRectangle;
 import org.apache.pdfbox.pdmodel.font.PDFont;
+import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
 import org.apache.pdfbox.pdmodel.graphics.image.PDImage;
 import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
 
@@ -545,12 +546,18 @@ public class DocumentAnalyzer {
 
         @Override
         public void strokePath() {
-            colorSpaces.add(getGraphicsState().getStrokingColor().getColorSpace().getName());
+            PDColorSpace pdColorSpace = getGraphicsState().getStrokingColor().getColorSpace();
+            if (pdColorSpace != null) {
+                colorSpaces.add(pdColorSpace.getName());
+            }
         }
 
         @Override
         public void fillPath(int windingRule) {
-            colorSpaces.add(getGraphicsState().getStrokingColor().getColorSpace().getName());
+            PDColorSpace pdColorSpace = getGraphicsState().getStrokingColor().getColorSpace();
+            if (pdColorSpace != null) {
+                colorSpaces.add(pdColorSpace.getName());
+            }
         }
 
         @Override

graphics-pdfbox/src/test/java/org/xbib/graphics/pdfbox/test/DocumentAnalyzerTest.java

@@ -41,4 +41,31 @@ public class DocumentAnalyzerTest {
         Files.delete(path);
         Files.delete(tmp);
     }
+
+    @Test
+    public void testPdfXDocument() throws IOException {
+        String sample = "20250017556.pdf";
+        Path tmp = Files.createTempDirectory("document-analyzer");
+        Path path = tmp.resolve(sample);
+        try (InputStream inputStream = getClass().getResourceAsStream(sample);
+             OutputStream outputStream = Files.newOutputStream(path)) {
+            if (inputStream != null) {
+                inputStream.transferTo(outputStream);
+                DocumentAnalyzer documentAnalyzer = new DocumentAnalyzer();
+                documentAnalyzer.process(path.toFile());
+                logger.log(Level.INFO, "result = " + documentAnalyzer.getResult());
+                logger.log(Level.INFO, "isvalid = " + documentAnalyzer.isValid());
+                logger.log(Level.INFO, "suffixes = " + documentAnalyzer.getSuffixes());
+                logger.log(Level.INFO, "colorspaces = " + documentAnalyzer.getColorSpaces());
+                logger.log(Level.INFO, "iscolor = " + documentAnalyzer.isColor());
+                logger.log(Level.INFO, "isgray = " + documentAnalyzer.isGray());
+                logger.log(Level.INFO, "isA4 = " + documentAnalyzer.isA4());
+                logger.log(Level.INFO, "isLetter = " + documentAnalyzer.isLetter());
+                logger.log(Level.INFO, "islandscape = " + documentAnalyzer.isLandscape());
+                logger.log(Level.INFO, "isimage = " + documentAnalyzer.isImage());
+            }
+        }
+        Files.delete(path);
+        Files.delete(tmp);
+    }
 }