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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to attempt and fix broken GIF images. Currently fix the following: *
* 1. EOF terminates before end of image size (adds black in the end). *
* Options: *
* -q : quiet printing mode. *
* -h : on-line help *
******************************************************************************
* History: *
* 5 May 91 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef __MSDOS__
#include <stdlib.h>
#include <alloc.h>
#endif /* __MSDOS__ */
#ifndef __MSDOS__
#include <stdlib.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "GifFix"
#ifdef __MSDOS__
extern unsigned int
_stklen = 16384; /* Increase default stack size. */
#endif /* __MSDOS__ */
#ifdef SYSV
static char *VersionStr =
"Gif toolkit module,\t\tGershon Elber\n\
(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr = "GifFix q%- h%- GifFile!*s";
#else
static char
*VersionStr =
PROGRAM_NAME
GIF_LIB_VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" q%- h%- GifFile!*s";
#endif /* SYSV */
/* Make some variables global, so we could access them faster: */
static int
ImageNum = 0;
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
int main(int argc, char **argv)
{
int i, j, Error, NumFiles, ExtCode, Row, Col, Width, Height,
DarkestColor = 0, ColorIntens = 10000, HelpFlag = FALSE;
GifRecordType RecordType;
GifByteType *Extension;
char **FileName = NULL;
GifRowType LineBuffer;
ColorMapObject *ColorMap;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint, &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) {
fprintf(stderr, "%s", VersionStr);
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);
/* Dump out exactly same screen information: */
if (EGifPutScreenDesc(GifFileOut,
GifFileIn->SWidth, GifFileIn->SHeight,
GifFileIn->SColorResolution, GifFileIn->SBackGroundColor,
GifFileIn->SColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
if ((LineBuffer = (GifRowType) malloc(GifFileIn->SWidth)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
/* 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);
if (GifFileIn->Image.Interlace)
GIF_EXIT("Cannt fix interlaced images.");
Row = GifFileIn->Image.Top; /* Image Position relative to Screen. */
Col = GifFileIn->Image.Left;
Width = GifFileIn->Image.Width;
Height = GifFileIn->Image.Height;
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
if (Width > GifFileIn->SWidth)
GIF_EXIT("Image is wider than total");
/* Put the image descriptor to out file: */
if (EGifPutImageDesc(GifFileOut, Col, Row, Width, Height,
FALSE, GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
/* Find the darkest color in color map to use as a filler. */
ColorMap = (GifFileIn->Image.ColorMap ? GifFileIn->Image.ColorMap :
GifFileIn->SColorMap);
for (i = 0; i < ColorMap->ColorCount; i++) {
j = ((int) ColorMap->Colors[i].Red) * 30 +
((int) ColorMap->Colors[i].Green) * 59 +
((int) ColorMap->Colors[i].Blue) * 11;
if (j < ColorIntens) {
ColorIntens = j;
DarkestColor = i;
}
}
/* Load the image, and dump it. */
for (i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (DGifGetLine(GifFileIn, LineBuffer, Width)
== GIF_ERROR) break;
if (EGifPutLine(GifFileOut, LineBuffer, Width)
== GIF_ERROR) QuitGifError(GifFileIn, GifFileOut);
}
if (i < Height) {
fprintf(stderr, "\nFollowing error occured (and ignored):");
PrintGifError();
/* Fill in with the darkest color in color map. */
for (j = 0; j < Width; j++)
LineBuffer[j] = DarkestColor;
for (; i < Height; i++)
if (EGifPutLine(GifFileOut, LineBuffer, Width)
== 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)
{
fprintf(stderr, "\nFollowing unrecoverable error occured:");
PrintGifError();
if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
exit(EXIT_FAILURE);
}
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