From:	nighthawk DOT NOSPAM AT nuernberg DOT NOUCE DOT netsurf DOT de (Nighthawk)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Some trouble with Allegro & DJGPP
Date:	Fri, 21 Nov 1997 18:50:23 GMT
Organization:	Hawk's Nest
Message-ID:	<3475d323.781597@news.nuernberg.netsurf.de>
NNTP-Posting-Host:	pmx35.nuernberg.netsurf.de
Lines:	35
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi there !

I'm currently developing a module for Allegro to support the loading
of GIF Files (yes, I know there is already one, but I need it for
special purposes :) and I ran into some trouble when reading the
palette. The program always crashes there.
Here's the snippet of code that's concerned :

if (GlobalPallete)
     for (i = 0; i < ColorMapSize; i++) {
          pallete[i]->r = NEXTBYTE;
          pallete[i]->g = NEXTBYTE;
          pallete[i]->b = NEXTBYTE;
     }

I have to say to this :
The function is defined as BITMAP *load_gif(const char* name, PALLETE*
pallete);
The whole gif file is read into memory with a pointer called data_ptr
to it. NEXTBYTE is defined as *data_ptr++. ColorMapSize is 256.
Now, the SIGSEV always occurres when i = 152;
Do you know what's wrong ?
 (pallete is allocated by (PALLETE*) malloc(sizeof(PALLETE)); from the
main program.)
I'm almost desperate...so I'd be very glad if someone could help :-)

Thank you in advance !

Matthias - Nighthawk - Tessmann


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