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