/*****************************************************************************
* "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) nor colormap(s) are changedin any way.
* Options:
* -v : verbose 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.
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "gifpos"
static char
*VersionStr =
PROGRAM_NAME
VERSION_COOKIE
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" v%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s";
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file.
******************************************************************************/
int main(int argc, char **argv)
{
int NumFiles, ExtCode, CodeSize, ImageNum = 0,
ScreenWidth, ScreenHeight, ImageLeft, ImageTop,
ImageN, ImageNLeft, ImageNTop;
bool Error,
ScreenFlag = false,
ImageFlag = false,
ImageNFlag = false,
HelpFlag = false;
GifRecordType RecordType;
GifByteType *Extension, *CodeBlock;
char **FileName = NULL;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifNoisyPrint,
&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(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
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->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->Image.Width, GifFileIn->Image.Height,
GifFileIn->Image.Interlace,
GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else if (ImageNum == ImageN && ImageNFlag) {
/* Image N should be repositioned: */
if (EGifPutImageDesc(GifFileOut,
ImageNLeft, ImageNTop,
GifFileIn->Image.Width, GifFileIn->Image.Height,
GifFileIn->Image.Interlace,
GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* No repositioning for this image: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn->Image.Left, GifFileIn->Image.Top,
GifFileIn->Image.Width, GifFileIn->Image.Height,
GifFileIn->Image.Interlace,
GifFileIn->Image.ColorMap) == 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);
return 0;
}
/******************************************************************************
* 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(EXIT_FAILURE);
}