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G/UTIL/GIFPOS.C
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G/UTIL/GIFPOS.C
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/*****************************************************************************
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* "Gif-Lib" - Yet another gif library. *
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* *
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* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
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******************************************************************************
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* Program to reposition GIF file, by changing screen size and/or image(s) *
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* position. Neither image(s) not colormap(s) are changed by any mean. *
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* Options: *
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* -q : quite printing mode. *
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* -s w h : set new screen size - width & height. *
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* -i t l : set new image position - top & left (for first image). *
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* -n n w h : set new image position - top & left (for image number n). *
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* -h : on line help. *
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******************************************************************************
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* History: *
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* 6 Jul 89 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef __MSDOS__
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#include <stdlib.h>
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#include <alloc.h>
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#endif /* __MSDOS__ */
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "GifPos"
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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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#ifdef SYSV
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static char *VersionStr =
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"Gif library module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr = "GifPos q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s";
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#else
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static char
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*VersionStr =
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PROGRAM_NAME
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GIF_LIB_VERSION
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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s";
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#endif /* SYSV */
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
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/******************************************************************************
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* Interpret the command line and scan the given GIF file. *
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******************************************************************************/
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void main(int argc, char **argv)
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{
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int Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
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ScreenFlag = FALSE, ScreenWidth, ScreenHeight,
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ImageFlag = FALSE, ImageLeft, ImageTop,
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ImageNFlag = FALSE, ImageN, ImageNLeft, ImageNTop,
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HelpFlag = FALSE;
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GifRecordType RecordType;
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GifByteType *Extension, *CodeBlock;
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char **FileName = NULL;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&ScreenFlag, &ScreenWidth, &ScreenHeight,
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&ImageFlag, &ImageLeft, &ImageTop,
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&ImageNFlag, &ImageN, &ImageNLeft, &ImageNTop,
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&HelpFlag, &NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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}
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if (HelpFlag) {
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fprintf(stderr, VersionStr);
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GAPrintHowTo(CtrlStr);
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exit(0);
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}
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if (NumFiles == 1) {
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if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else {
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/* Use the stdin instead: */
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if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/* Open stdout for the output file: */
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if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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/* And dump out its new possible repositioned screen information: */
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if (EGifPutScreenDesc(GifFileOut,
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ScreenFlag ? ScreenWidth : GifFileIn -> SWidth,
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ScreenFlag ? ScreenHeight : GifFileIn -> SHeight,
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GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
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GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Scan the content of the GIF file and load the image(s) in: */
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do {
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if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Put possibly repositioned image descriptor to out file: */
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if (++ImageNum == 1 && ImageFlag) {
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/* First image should be repositioned: */
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if (EGifPutImageDesc(GifFileOut,
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ImageLeft, ImageTop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else if (ImageNum == ImageN && ImageNFlag) {
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/* Image N should be repositioned: */
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if (EGifPutImageDesc(GifFileOut,
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ImageNLeft, ImageNTop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else {
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/* No repositioning for this image: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/* Now read image itself in decoded form as we dont really */
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/* care what we have there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR ||
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EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL) {
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
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EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case EXTENSION_RECORD_TYPE:
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
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Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* No support to more than one extension blocks, so discard: */
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case TERMINATE_RECORD_TYPE:
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break;
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default: /* Should be traps by DGifGetRecordType. */
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break;
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}
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}
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while (RecordType != TERMINATE_RECORD_TYPE);
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if (DGifCloseFile(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/******************************************************************************
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* Close both input and output file (if open), and exit. *
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******************************************************************************/
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
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{
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PrintGifError();
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if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
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if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
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exit(1);
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}
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