[IMAGING-179] Adding a directory causes "APP1 Segment is too long"

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Format: JPEG
• External issue URL: https://josm.openstreetmap.de/ticket/11757
• Assignee: Unassigned
• Reporter: Simon Legner
• Created: 17/Jan/16 11:57
• Updated: 07/Sep/16 01:24

Description

SVN revision: 1696444

The following snippet causes ExifRewriter$ExifOverflowException: APP1 Segment is too long: 65548

final File in = new File("123.jpg");
final TiffImageMetadata exif = ((JpegImageMetadata) Imaging.getMetadata(in)).getExif();
final TiffOutputSet outputSet = exif.getOutputSet();
outputSet.getOrCreateGPSDirectory().add(GpsTagConstants.GPS_TAG_GPS_IMG_DIRECTION, RationalNumber.valueOf(123));
new ExifRewriter().updateExifMetadataLossless(in, new ByteArrayOutputStream(), outputSet);

When inspecting the EXIF data using jhead -exifmap 123.jpg, the header reveals unfilled space between 47198 and 65526. Nevertheless, this space is not used, but instead the GPS directory is being appended starting at offset 65526.

Map: 00008-00182: Directory
Map: 00184-00202:   Data for tag 010f
Map: 00204-00214:   Data for tag 0110
Map: 00216-00224:   Data for tag 011a
Map: 00224-00232:   Data for tag 011b
Map: 00232-00242:   Data for tag 0131
Map: 00244-00264:   Data for tag 0132
Map: 00264-00280:   Data for tag 013e
Map: 00280-00328:   Data for tag 013f
Map: 00328-00352:   Data for tag 0211
Map: 00352-00850: Directory
Map: 00852-00860:   Data for tag 829a
Map: 00860-00868:   Data for tag 829d
Map: 00868-00888:   Data for tag 9003
Map: 00888-00908:   Data for tag 9004
Map: 00908-00916:   Data for tag 9102
Map: 00916-00924:   Data for tag 9204
Map: 00924-00932:   Data for tag 9205
Map: 00932-00940:   Data for tag 920a
Map: 01008-35518:   Data for tag 927c
Map: 00940-00984:   Data for tag 9286
Map: 35518-35548: Directory
Map: 00984-00992:   Data for tag a302
Map: 00992-01000:   Data for tag a404
Map: 01000-01008:   Data for tag a500
Map: 35568-35658: Directory
Map: 35660-35668:   Data for tag 011a
Map: 35668-35676:   Data for tag 011b
Map: 35676-47197: Thumbnail
Map: 65526- End of exif