mirror of
https://github.com/openharmony/third_party_giflib.git
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mamingshuai
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/****************************************************************************
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gifsponge.c - skeleton file for generic GIF `sponge' program
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Slurp a GIF into core, operate on it, spew it out again. Most of the
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junk above `int main' isn't needed for the skeleton, but is likely to
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be for what you'll do with it.
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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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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 gifbuild -d).
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SPDX-License-Identifier: MIT
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****************************************************************************/
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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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#include <fcntl.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "gifsponge"
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int main(int argc, char **argv)
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{
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int i, ErrorCode;
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GifFileType *GifFileIn, *GifFileOut = (GifFileType *)NULL;
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if ((GifFileIn = DGifOpenFileHandle(0, &ErrorCode)) == NULL) {
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PrintGifError(ErrorCode);
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exit(EXIT_FAILURE);
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}
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if (DGifSlurp(GifFileIn) == GIF_ERROR) {
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PrintGifError(GifFileIn->Error);
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exit(EXIT_FAILURE);
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}
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if ((GifFileOut = EGifOpenFileHandle(1, &ErrorCode)) == NULL) {
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PrintGifError(ErrorCode);
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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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if (GifFileIn->SColorMap) {
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GifFileOut->SColorMap = GifMakeMapObject(
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GifFileIn->SColorMap->ColorCount,
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GifFileIn->SColorMap->Colors);
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} else {
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GifFileOut->SColorMap = NULL;
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}
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for (i = 0; i < GifFileIn->ImageCount; i++)
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(void) GifMakeSavedImage(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(GifFileOut->Error);
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if (DGifCloseFile(GifFileIn, &ErrorCode) == GIF_ERROR)
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PrintGifError(ErrorCode);
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return 0;
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}
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/* end */
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