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G/UTIL/GIFFIX.C
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G/UTIL/GIFFIX.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 attempt and fix broken GIF images. Currently fix the following: *
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* 1. EOF terminates before end of image size (adds black in the end). *
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* Options: *
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* -q : quite printing mode. *
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* -h : on line help *
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******************************************************************************
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* History: *
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* 5 May 91 - 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 "GifFix"
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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 = "GifFix q%- 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%- h%- GifFile!*s";
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#endif /* SYSV */
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/* Make some variables global, so we could access them faster: */
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static int
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ImageNum = 0;
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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 i, j, Error, NumFiles, ExtCode, ColorMapSize, Row, Col, Width, Height,
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DarkestColor = 0, ColorIntens = 10000, HelpFlag = FALSE;
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GifRecordType RecordType;
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GifByteType *Extension;
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char **FileName = NULL;
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GifRowType LineBuffer;
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GifColorType *ColorMap;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint, &HelpFlag,
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&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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/* Dump out exactly same screen information: */
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if (EGifPutScreenDesc(GifFileOut,
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GifFileIn -> SWidth, 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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if ((LineBuffer = (GifRowType) malloc(GifFileIn -> SWidth)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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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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if (GifFileIn -> IInterlace)
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GIF_EXIT("Cannt fix interlaced images.");
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Row = GifFileIn -> ITop; /* Image Position relative to Screen. */
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Col = GifFileIn -> ILeft;
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Width = GifFileIn -> IWidth;
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Height = GifFileIn -> IHeight;
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GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
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/* Put the image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut, Col, Row, Width, Height,
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FALSE, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Find the darkest color in color map to use as a filler. */
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ColorMap = (GifFileIn -> IColorMap ? GifFileIn -> IColorMap :
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GifFileIn -> SColorMap);
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ColorMapSize = 1 << (GifFileIn -> IColorMap ?
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GifFileIn -> IBitsPerPixel :
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GifFileIn -> SBitsPerPixel);
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for (i = 0; i < ColorMapSize; i++) {
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j = ((int) ColorMap[i].Red) * 30 +
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((int) ColorMap[i].Green) * 59 +
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((int) ColorMap[i].Blue) * 11;
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if (j < ColorIntens) {
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ColorIntens = j;
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DarkestColor = i;
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}
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}
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/* Load the image, and dump it. */
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (DGifGetLine(GifFileIn, LineBuffer, Width)
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== GIF_ERROR) break;
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if (EGifPutLine(GifFileOut, LineBuffer, Width)
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== GIF_ERROR) QuitGifError(GifFileIn, GifFileOut);
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}
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if (i < Height) {
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fprintf(stderr, "\nFollowing error occured (and ignored):");
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PrintGifError();
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/* Fill in with the darkest color in color map. */
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for (j = 0; j < Width; j++)
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LineBuffer[j] = DarkestColor;
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for (; i < Height; i++)
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if (EGifPutLine(GifFileOut, LineBuffer, Width)
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== GIF_ERROR) 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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fprintf(stderr, "\nFollowing unrecoverable error occured:");
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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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