Fix exception when parsing EXIF data with LONG Orientation

src/main/java/edu/illinois/library/cantaloupe/image/Metadata.java

@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import edu.illinois.library.cantaloupe.image.exif.Directory;
+import edu.illinois.library.cantaloupe.image.exif.Field;
 import edu.illinois.library.cantaloupe.image.exif.Tag;
 import edu.illinois.library.cantaloupe.image.iptc.DataSet;
 import edu.illinois.library.cantaloupe.image.xmp.MapReader;
@@ -120,10 +121,7 @@ public Orientation getOrientation() {
                 if (orientation == null) {
                     orientation = Orientation.ROTATE_0;
                 }
-            } catch (IllegalArgumentException e) {
-                LOGGER.info("readOrientation(): {}", e.getMessage());
-                orientation = Orientation.ROTATE_0;
-            } catch (RiotException e) {    
+            } catch (IllegalArgumentException | RiotException e) {
                 LOGGER.info("readOrientation(): {}", e.getMessage());
                 orientation = Orientation.ROTATE_0;
             }
@@ -132,9 +130,29 @@ public Orientation getOrientation() {
     }
 
     private void readOrientationFromEXIF() {
+        Field field = exif.getField(Tag.ORIENTATION);
         Object value = exif.getValue(Tag.ORIENTATION);
-        if (value != null) {
-            orientation = Orientation.forEXIFOrientation((int) value);
+        if (field != null && value != null) {
+            switch (field.getDataType()) {
+                case LONG:
+                case SLONG:
+                case SHORT:
+                case SSHORT:
+                    // According to spec the orientation must be an unsigned short (16 bit)
+                    // However, we have seen exif data in the wild with LONG and SLONG types
+                    // Thus to be lenient we accept either and convert to int (github issue #548)
+                    // It could also happen that 'value' is in fact a Java Integer even if the
+                    // exif data type is LONG or SLONG, so we need to check for that as well.
+                    if (value instanceof Long) {
+                        orientation = Orientation.forEXIFOrientation(Math.toIntExact((long) value));
+                    } else if (value instanceof Integer) {
+                        orientation = Orientation.forEXIFOrientation((int) value);
+                    }
+                    break;
+                default:
+                    LOGGER.warn("readOrientationFromEXIF(): Unsupported Orientation data type: {}",
+                            field.getDataType());
+            }
         }
     }
 

src/main/java/edu/illinois/library/cantaloupe/image/exif/Directory.java

@@ -170,6 +170,14 @@ public Object getValue(Tag tag) {
                 .orElse(null);
     }
 
+    public Field getField(Tag tag) {
+        return fields.keySet()
+                .stream()
+                .filter(f -> f.getTag().equals(tag))
+                .findFirst()
+                .orElse(null);
+    }
+
     @Override
     public int hashCode() {
         final Map<Integer,Integer> codes = new HashMap<>();

src/test/java/edu/illinois/library/cantaloupe/image/MetadataTest.java

@@ -17,12 +17,15 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+import java.nio.file.FileVisitOption;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -232,6 +235,20 @@ void testGetOrientationWithOnlyIllegalEXIFOrientation() throws Exception {
         }
     }
 
+    @Test
+    void testGetOrientationWithOnlyLONGEXIFOrientation() throws Exception {
+        // This image has exif Orientation stored as SLONG, causing a failure (github issue #548)
+        Path fixture = TestUtil.getImage("jpg-exif-long-orientation.jpg");
+        ImageReader reader = new ImageReaderFactory()
+                .newImageReader(Format.get("jpg"), fixture);
+        try {
+            Metadata metadata = reader.getMetadata(0);
+            assertEquals(Orientation.ROTATE_0, metadata.getOrientation());
+        } finally {
+            reader.dispose();
+        }
+    }
+
     @Test
     void testGetOrientationWithOnlyXMPOrientation() throws Exception {
         Path fixture = TestUtil.getImage("jpg-xmp-orientation-90.jpg");

src/test/java/edu/illinois/library/cantaloupe/image/exif/DirectoryTest.java

@@ -366,6 +366,14 @@ void testGetValueWithoutMatchingValue() {
         assertNull(ifd.getValue(Tag.MAKE));
     }
 
+    @Test
+    void testGetField() {
+        final Directory ifd = new Directory(TagSet.BASELINE_TIFF);
+        ifd.put(Tag.MAKE, DataType.ASCII, "Cats");
+        Field field = ifd.getField(Tag.MAKE);
+        assertEquals(DataType.ASCII, field.getDataType());
+    }
+
     @Test
     void testHashCodeWithEqualInstances() {
         final Directory subIFD1 = new Directory(TagSet.EXIF);