Re-encoding a CCITT compressed TIFF may cause ClassCastException

[haraldk]

In the case of re-encoding a CCITT compressed TIFF, with metadata from the original, the G3/G4 options may not be a long value as the writer expects, thus causing a ClassCastException.

See #310 for background and sample images.

Full stack trace:

Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
at com.twelvemonkeys.imageio.plugins.tiff.TIFFImageWriter.createCompressorStream(TIFFImageWriter.java:578)
at com.twelvemonkeys.imageio.plugins.tiff.TIFFImageWriter.writePage(TIFFImageWriter.java:430)
at com.twelvemonkeys.imageio.plugins.tiff.TIFFImageWriter.writeToSequence(TIFFImageWriter.java:975)

Easily fixed by changing the line in question to:

option = ((Number) entries.get(compression == TIFFExtension.COMPRESSION_CCITT_T4 ? TIFF.TAG_GROUP3OPTIONS : TIFF.TAG_GROUP4OPTIONS).getValue()).longValue();

[haraldk]

Fixed in 6ea1ea8.