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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber Ver 0.1, Jul. 1989 *
- ******************************************************************************
- * Program to reposition GIF file, by changing screen size and/or image(s) *
- * position. Neither image(s) not colormap(s) are changed by any mean. *
- * Options: *
- * -q : quite printing mode. *
- * -s w h : set new screen size - width & height. *
- * -i t l : set new image position - top & left (for first image). *
- * -n n w h : set new image position - top & left (for image number n). *
- * -h : on line help. *
- ******************************************************************************
- * History: *
- * 6 Jul 89 - Version 1.0 by Gershon Elber. *
- *****************************************************************************/
-
- #ifdef __MSDOS__
- #include <stdlib.h>
- #include <alloc.h>
- #endif /* __MSDOS__ */
-
- #include <stdio.h>
- #include <ctype.h>
- #include <string.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "GifPos"
-
- #ifdef __MSDOS__
- extern unsigned int
- _stklen = 16384; /* Increase default stack size. */
- #endif /* __MSDOS__ */
-
- #ifdef SYSV
- static char *VersionStr =
- "Gif library module,\t\tGershon Elber\n\
- (C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
- static char
- *CtrlStr = "GifPos q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s";
- #else
- static char
- *VersionStr =
- PROGRAM_NAME
- GIF_LIB_VERSION
- " Gershon Elber, "
- __DATE__ ", " __TIME__ "\n"
- "(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
- static char
- *CtrlStr =
- PROGRAM_NAME
- " q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s";
- #endif /* SYSV */
-
- static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
-
- /******************************************************************************
- * Interpret the command line and scan the given GIF file. *
- ******************************************************************************/
- void main(int argc, char **argv)
- {
- int Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
- ScreenFlag = FALSE, ScreenWidth, ScreenHeight,
- ImageFlag = FALSE, ImageLeft, ImageTop,
- ImageNFlag = FALSE, ImageN, ImageNLeft, ImageNTop,
- HelpFlag = FALSE;
- GifRecordType RecordType;
- GifByteType *Extension, *CodeBlock;
- char **FileName = NULL;
- GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
- &ScreenFlag, &ScreenWidth, &ScreenHeight,
- &ImageFlag, &ImageLeft, &ImageTop,
- &ImageNFlag, &ImageN, &ImageNLeft, &ImageNTop,
- &HelpFlag, &NumFiles, &FileName)) != FALSE ||
- (NumFiles > 1 && !HelpFlag)) {
- if (Error)
- GAPrintErrMsg(Error);
- else if (NumFiles > 1)
- GIF_MESSAGE("Error in command line parsing - one GIF file please.");
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
-
- if (HelpFlag) {
- fprintf(stderr, VersionStr);
- GAPrintHowTo(CtrlStr);
- exit(0);
- }
-
- if (NumFiles == 1) {
- if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
- }
- else {
- /* Use the stdin instead: */
- if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
- }
-
- /* Open stdout for the output file: */
- if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* And dump out its new possible repositioned screen information: */
- if (EGifPutScreenDesc(GifFileOut,
- ScreenFlag ? ScreenWidth : GifFileIn -> SWidth,
- ScreenFlag ? ScreenHeight : GifFileIn -> SHeight,
- GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
- GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* Scan the content of the GIF file and load the image(s) in: */
- do {
- if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- switch (RecordType) {
- case IMAGE_DESC_RECORD_TYPE:
- if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- /* Put possibly repositioned image descriptor to out file: */
- if (++ImageNum == 1 && ImageFlag) {
- /* First image should be repositioned: */
- if (EGifPutImageDesc(GifFileOut,
- ImageLeft, ImageTop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
- else if (ImageNum == ImageN && ImageNFlag) {
- /* Image N should be repositioned: */
- if (EGifPutImageDesc(GifFileOut,
- ImageNLeft, ImageNTop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
- else {
- /* No repositioning for this image: */
- if (EGifPutImageDesc(GifFileOut,
- GifFileIn -> ILeft, GifFileIn -> ITop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
-
- /* Now read image itself in decoded form as we dont really */
- /* care what we have there, and this is much faster. */
- if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR ||
- EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- while (CodeBlock != NULL) {
- if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
- EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
- break;
- case EXTENSION_RECORD_TYPE:
- /* Skip any extension blocks in file: */
- if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
- Extension) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* No support to more than one extension blocks, so discard: */
- while (Extension != NULL) {
- if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
- break;
- case TERMINATE_RECORD_TYPE:
- break;
- default: /* Should be traps by DGifGetRecordType. */
- break;
- }
- }
- while (RecordType != TERMINATE_RECORD_TYPE);
-
- if (DGifCloseFile(GifFileIn) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- if (EGifCloseFile(GifFileOut) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
-
- /******************************************************************************
- * Close both input and output file (if open), and exit. *
- ******************************************************************************/
- static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
- {
- PrintGifError();
- if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
- if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
- exit(1);
- }
-