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June 1994
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1994.06.24 18:08 "Re: Think C Libtiff ???", by Niles Ritter
"David W. Leland" <dleland@maroon.tc.umn.edu> writes:
>Would anyone out there happen to have already created a Think C version of
>Libtiff for the Mac?
>
>Well,I'm sure it's been done, so what I'm really asking is if if anyone reading
>this would be willing to let me get my greedy little hands on it, so I can be
>lazy.
A lot depends on which version of libtiff, and which version of
Think/Symantec C. Are you using the new 3.3 ANSI-compliant version
of libtiff? Think 5.0? 6.0? Symantec C++ 7.0+? They all have to
be tweeked differently.
For the sake of argument, I will assume you are on the bleeding edge
and using the latest and greatest of both. If you want lzw compression,
a few changes need to be made because of the large static arrays that
make it gag. Also,the fax3 fax4 and g3states
stuff wont work at all, so leave out the fax compressions. You can
disable these either by editing "tiffconf.h" directly, or by
defining COMPRESSION_SUPPORT in the "Prefix" preferences.
Basically, all you have to do to make independent libraries is to
split it up into two projects (so you wont have to worry about 32K
limitations). Then in the Think C Preferences, turn on the
"ANSI" button, and then activate the "Think C" checkbox, the
"4-byte int" checkbox (it might work with two-byte ints, but you
can't be too careful). You can optionally turn on the 68020 box for
speed, but if you turn on the 68881 box your code will no longer
be PowerPC compatible.
When you link programs, because you used "4-byte int", you will have
to make a copy of the "ANSI" and "unix" library and recompile them with the
4-byte int option as well. Or you can be daring and try building everything
without it.
I will put an binhexed archive of two files called libtiff1 and libtiff2
which will do the job, together with an example chunk of code.
(I'm pretty sure that Sam has integrated the lzw changes into his
next release of libtiff, so there's nothing in these archives that
he would care about). The file will be at the location
ftp://mtritter.jpl.nasa.gov/pub/tiff/libtiff_mac.sea.hqx
(about 270K in size)
This is a Symantec 7.0 project, so if you got an earlier version you
will have to do what I decribed above. The fixed version of the
LZW code and a little more "maclike" tiffinfo utility project is
provided as an example. Good luck!
--Niles.