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April 2006
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2006.04.03 15:21 "Re: WORDS_BIGENDIAN makes libtiff platform dependent", by Bob Friesenhahn
On Tue, 4 Apr 2006, Graeme Gill wrote:
>
> There's nothing like that in the (older) version I've been using (V3.6.1).
> In fact in tif_open.c, there doesn't appear to be any compile time
> endian dependent code. HOST_BIGENDIAN seems to be defined in
> tiffconf.h, but not used anywhere except tools/ras2tiff.c.
>
> So it looks like compile time endian dependent code has been introduced
> at some stage. I would suspect it's quite unnecessary (ie. could have
> been coded differently.)
Based on prevailing evidence, I believe that you are correct. Here
are the ChangeLog entries:
2005-06-03 Andrey Kiselev <dron@ak4719.spb.edu>
* libtiff/tif_open.c: Replace runtime endianess check with the compile
time one.
2004-08-16 Andrey Kiselev <dron@ak4719.spb.edu>
* tools/ras2tiff.c: Fixed issue with missed big-endian checks as per
bug http://bugzilla.remotesensing.org/show_bug.cgi?id=586
I expect that the BigTIFF support (planned for libtiff 4.0) is going
to require more knowledge of its evironment since a 64-bit type needs
to be identified. Some target-specific configuration will always be
required.
Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/