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November 2007

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2007.11.23 18:03 "Bug in _TIFFFindFieldInfo and some DNG tags in 3.8.2", by Antonio Scuri

2007.11.23 18:58 "Re: Bug in _TIFFFindFieldInfo and some DNG tags in 3.8.2", by Frank Warmerdam

2007.11.23 18:03 "Bug in _TIFFFindFieldInfo and some DNG tags in 3.8.2", by Antonio Scuri

  Hi,

  The DNG tags TIFFTAG_BLACKLEVEL, TIFFTAG_DEFAULTCROPSIZE and
TIFFTAG_DEFAULTCROPORIGIN, can be SHORT, LONG or RATIONAL. But in a test
file that is LONG, libTIFF is interpreting always as RATIONAL since
TIFFFindFieldInfo is using the first definition found.

  The problem is in the code:

		if (fip->field_tag == tag &&
		    (dt == TIFF_ANY || fip->field_type == dt))
			return (tif->tif_foundfield = fip);

  It exists inside an "else" of (dt != TIFF_ANY), so it is ignoring the
second test always.

  In libTIFF 4.0 this implementation is completely different, so I don't
know if this bug report is relevant or not. And I did not test it with
version 4.0, so I also don't know if it is fixed. If anyone needs a test
image, please let me know.

Best Regards,
Antonio Scuri