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/*
* Skeleton file for generic GIF `sponge' program --- slurp a GIF into core,
* operate on it, spew it out again. Most of the junk above `int main' isn't
* needed for the skeleton, but is likely to be for what you'll do with it.
*
* If you compile this, it will turn into an expensive GIF copying routine;
* stdin to stdout with no changes and minimal validation. Well, it's a
* decent test of DGifSlurp() and EGifSpew(), anyway.
*
* Note: due to the vicissitudes of Lempel-Ziv compression, the output of this
* copier may not be bitwise identical to its input. This can happen if you
* copy an image from a much more (or much *less*) memory-limited system; your
* compression may use more (or fewer) bits. The uncompressed rasters should,
* however, be identical (you can check this with icon2gif -d).
*
* Eric S. Raymond
* esr@snark.thyrsus.com
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef __MSDOS__
#include <dos.h>
#include <alloc.h>
#include <graphics.h>
#include <io.h>
#endif /* __MSDOS__ */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#include "getarg.h"
#include "gif_lib.h"
#define PROGRAM_NAME "gifspnge"
#ifdef __MSDOS__
extern unsigned int
_stklen = 16384; /* Increase default stack size. */
#endif /* __MSDOS__ */
int main(int argc, char **argv)
{
int i;
GifFileType *GifFileIn, *GifFileOut = (GifFileType *)NULL;
if ((GifFileIn = DGifOpenFileHandle(0)) == NULL
|| DGifSlurp(GifFileIn) == GIF_ERROR
|| ((GifFileOut = EGifOpenFileHandle(1)) == (GifFileType *)NULL))
{
PrintGifError();
exit(EXIT_FAILURE);
}
/*
* Your operations on in-core structures go here.
* This code just copies the header and each image from the incoming file.
*/
GifFileOut->SWidth = GifFileIn->SWidth;
GifFileOut->SHeight = GifFileIn->SHeight;
GifFileOut->SColorResolution = GifFileIn->SColorResolution;
GifFileOut->SBackGroundColor = GifFileIn->SBackGroundColor;
GifFileOut->SColorMap = MakeMapObject(
GifFileIn->SColorMap->ColorCount,
GifFileIn->SColorMap->Colors);
for (i = 0; i < GifFileIn->ImageCount; i++)
(void) MakeSavedImage(GifFileOut, &GifFileIn->SavedImages[i]);
/*
* Note: don't do DGifCloseFile early, as this will
* deallocate all the memory containing the GIF data!
*
* Further note: EGifSpew() doesn't try to validity-check any of this
* data; it's *your* responsibility to keep your changes consistent.
* Caveat hacker!
*/
if (EGifSpew(GifFileOut) == GIF_ERROR)
PrintGifError();
else if (DGifCloseFile(GifFileIn) == GIF_ERROR)
PrintGifError();
return 0;
}
/* gifspnge.c ends here */
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