BigTIFF & libtiff library version

[Adam Goode]

If you want bigtiff functionality, please use libtiff 4.0 (or greater).
Don't bother with the old/experimental version from bigtiff.org.

Adam
On Jun 17, 2012 3:23 PM, "Agelos Pappas" <agelos at smartcode.gr> wrote:

> Hello,
>
> I was trying to compile OpenSlide using the unofficial BigTIFF modified
> version of libtiff available here:
> http://bigtiff.org/
>
> in order to add support for BigTIFF in OpenSlide. Although I was able to
> compile BigTIFF and then OpenSlide successfully, I was getting runtime
> errors signifying that there was a problem in the libtiff library.
> I tried to test the library with an Aperio SVS file that previously
> worked fine, but was now giving errors.
>
> Specifically the problem was in this call:
> openslide-hash.c, Line 117:
>
> if (TIFFGetField(tiff, TIFFTAG_TILEBYTECOUNTS, &sizes) == 0)
>
> Even though TIFFGetField returned a correct value, the sizes pointer did
> not receive a value. The TIFFGetField function is implemented in
> tifflib, in the file tif_dir.c:
>
> This is an extract from libtiff
>         case TIFFTAG_TILEBYTECOUNTS:
>             _TIFFFillStriles( tif );
>             *va_arg(ap, uint64**) = td->td_stripbytecount;
>             break;
>
> in the modified BigTIFF libtiff version, the equivalent implementation
> looks like this (tif_dir.c):
>     case TIFFTAG_TILEBYTECOUNTS:
>             *va_arg(ap, uint32**) = td->td_stripbcsbuf;
>             break;
>
> As you can see, the call to _TIFFFillStriles( tif ) is missing from the
> BigTIFF version and the function is nowhere defined. Thus OpenSlide does
> not work when built against the BigTIFF version.
> Does OpenSlide use a modified libtiff version? Has anyone else managed
> to add support for BigTIFF? Is there an official version of libtiff
> supporting BigTIFF?
>
> Regards
> Agelos
>
>
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> openslide-users at lists.andrew.cmu.edu
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>
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