www.pudn.com > giflib12.zip > GIFFIX.C

/***************************************************************************** 
*   "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 : quite printing mode.						     * 
* -h : on line help							     * 
****************************************************************************** 
* History:								     * 
* 5 May 91 - Version 1.0 by Gershon Elber.				     * 
*****************************************************************************/ 
 
#ifdef __MSDOS__ 
#include  
#include  
#endif /* __MSDOS__ */ 
 
#include  
#include  
#include  
#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 library module,\t\tGershon Elber\n\ 
	(C) Copyright 1989 Gershon Elber, Non commercial use only.\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, Non commercial use only.\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.		      * 
******************************************************************************/ 
void main(int argc, char **argv) 
{ 
    int	i, j, Error, NumFiles, ExtCode, ColorMapSize, Row, Col, Width, Height, 
	DarkestColor = 0, ColorIntens = 10000, HelpFlag = FALSE; 
    GifRecordType RecordType; 
    GifByteType *Extension; 
    char **FileName = NULL; 
    GifRowType LineBuffer; 
    GifColorType *ColorMap; 
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint, &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); 
 
    /* Dump out exactly same screen information: */ 
    if (EGifPutScreenDesc(GifFileOut, 
	GifFileIn -> SWidth, GifFileIn -> SHeight, 
	GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor, 
	GifFileIn -> SBitsPerPixel, 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 -> IInterlace) 
		    GIF_EXIT("Cannt fix interlaced images."); 
 
		Row = GifFileIn -> ITop; /* Image Position relative to Screen. */ 
		Col = GifFileIn -> ILeft; 
		Width = GifFileIn -> IWidth; 
		Height = GifFileIn -> IHeight; 
		GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]:     ", 
		    PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height); 
 
		/* Put the image descriptor to out file: */ 
		if (EGifPutImageDesc(GifFileOut, Col, Row, Width, Height, 
		    FALSE, GifFileIn -> IBitsPerPixel, 
		    GifFileIn -> IColorMap) == GIF_ERROR) 
		    QuitGifError(GifFileIn, GifFileOut); 
 
		/* Find the darkest color in color map to use as a filler. */ 
		ColorMap = (GifFileIn -> IColorMap ? GifFileIn -> IColorMap : 
						     GifFileIn -> SColorMap); 
		ColorMapSize = 1 << (GifFileIn -> IColorMap ? 
						GifFileIn -> IBitsPerPixel : 
						GifFileIn -> SBitsPerPixel); 
		for (i = 0; i < ColorMapSize; i++) { 
		    j = ((int) ColorMap[i].Red) * 30 + 
			((int) ColorMap[i].Green) * 59 + 
			((int) ColorMap[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); 
} 
 
/****************************************************************************** 
* 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(1); 
}