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September 2004
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2004.09.17 11:40 "Re: BigTIFF Tag Value Count issue", by Joris Van Damme
> This does raise an interesting question. I would personally like libtiff
> to continue working on platforms with no identifiable 64bit integer
> data type if practical. Of course it would be fine if it only supported
> files smaller than 4GB in this case.
>
> Does anyone know if stuff like PDA's and such have efficient-to-use
> 64bit integer datatypes? I am somewhat doubtful.
Is it allowable to have BigTIFF not work on those machines, but have classic
TIFF still in working order? Perhaps a structure like...
#ifdef BIGTIFF_SUPPORT
if file is tiff classic {
#endif
tiff classic supporting code
** this includes reporting error when suffering the consequences
of getting a BigTIFF file **
#ifdef BIGTIFF_SUPPORT
} else {
bigtiff supporting code
}
#endif
... when applied systematically, could solve this? Users without 64bit integer,
could compile the library to support only TIFF classic, by disabling
BIGTIFF_SUPPORT. If they should next use this TIFF-classic-only build to read a
BigTIFF file, the file would be properly detected as not a valid TIFF, I presume
(right from the start even, when looking at signature). Is this acceptable?
Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be
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