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

/***************************************************************************** 
*   "Gif-Lib" - Yet another gif library.				     * 
*									     * 
* Written by:  Gershon Elber				Ver 0.1, Jul. 1989   * 
****************************************************************************** 
* Program to assemble/disassemble GIF files: disassembles multi image file   * 
* into seperated files, or assembles few single image GIF files into one.    * 
* Options:								     * 
* -q : quite printing mode.						     * 
* -a : assemble few files into one (default)				     * 
* -d name : disassmble given GIF file into seperate files derived from name. * 
* -h : on line help.							     * 
****************************************************************************** 
* History:								     * 
* 7 Jul 89 - 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	"GifAsm" 
 
#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 = "GifAsm q%- a%- d%-OutFileName!s h%- GifFile(s)!*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%- a%- d%-OutFileName!s h%- GifFile(s)!*s"; 
#endif /* SYSV */ 
 
static int 
    AsmFlag = FALSE; 
 
static void DoAssembly(int NumFiles, char **FileNames); 
static void DoDisassembly(char *InFileName, char *OutFileName); 
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, DisasmFlag = FALSE, HelpFlag = FALSE; 
    char **FileNames = NULL, *OutFileName; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, 
		&GifQuitePrint, &AsmFlag, &DisasmFlag, &OutFileName, 
		&HelpFlag, &NumFiles, &FileNames)) != FALSE) { 
	GAPrintErrMsg(Error); 
	GAPrintHowTo(CtrlStr); 
	exit(1); 
    } 
 
    if (HelpFlag) { 
	fprintf(stderr, VersionStr); 
	GAPrintHowTo(CtrlStr); 
	exit(0); 
    } 
 
    if (!AsmFlag && !DisasmFlag) AsmFlag = TRUE; /* Make default - assemble. */ 
    if (AsmFlag && NumFiles < 2) { 
	GIF_MESSAGE("At list two GIF files are required to assembly operation."); 
	GAPrintHowTo(CtrlStr); 
	exit(1); 
    } 
    if (!AsmFlag && NumFiles > 1) { 
	GIF_MESSAGE("Error in command line parsing - one GIF file please."); 
	GAPrintHowTo(CtrlStr); 
	exit(1); 
    } 
 
    if (AsmFlag) 
        DoAssembly(NumFiles, FileNames); 
    else 
	DoDisassembly(NumFiles == 1 ? *FileNames : NULL, OutFileName); 
} 
 
/****************************************************************************** 
* Perform the assembly operation - take few input files into one output.      * 
******************************************************************************/ 
static void DoAssembly(int NumFiles, char **FileNames) 
{ 
    int	i, ExtCode, CodeSize; 
    GifRecordType RecordType; 
    GifByteType *Extension, *CodeBlock; 
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL; 
 
    /* Open stdout for the output file: */ 
    if ((GifFileOut = EGifOpenFileHandle(1)) == NULL) 
	QuitGifError(GifFileIn, GifFileOut); 
 
    /* Scan the content of the GIF file and load the image(s) in: */ 
    for (i = 0; i < NumFiles; i++) { 
	if ((GifFileIn = DGifOpenFileName(FileNames[i])) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
 
	/* And dump out screen descriptor iff its first image.	*/ 
	if (i == 0) 
	    if (EGifPutScreenDesc(GifFileOut, 
		GifFileIn -> SWidth, GifFileIn -> SHeight, 
		GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor, 
		GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR) 
		QuitGifError(GifFileIn, GifFileOut); 
 
	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 image descriptor to out file: */ 
		    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      */ 
		    /* dont care what is 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, 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); 
} 
 
/****************************************************************************** 
* Perform the disassembly operation - take one input files into few output.   * 
******************************************************************************/ 
static void DoDisassembly(char *InFileName, char *OutFileName) 
{ 
    int	i, ExtCode, CodeSize, FileNum = 0, FileEmpty; 
    GifRecordType RecordType; 
    char CrntFileName[80], *p; 
    GifByteType *Extension, *CodeBlock; 
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL; 
 
    /* If name has type postfix, strip it out, and make sure name is less    */ 
    /* or equal to 6 chars, so we will have 2 chars in name for numbers.     */ 
    for (i = 0; i < strlen(OutFileName);  i++)/* Make sure all is upper case.*/ 
	if (islower(OutFileName[i])) 
	    OutFileName[i] = toupper(OutFileName[i]); 
 
    if ((p = strrchr(OutFileName, '.')) != NULL && strlen(p) <= 4) p[0] = 0; 
    if ((p = strrchr(OutFileName, '/')) != NULL || 
	(p = strrchr(OutFileName, '\\')) != NULL || 
	(p = strrchr(OutFileName, ':')) != NULL) { 
	if (strlen(p) > 7) p[7] = 0;  /* p includes the '/', '\\', ':' char. */ 
    } 
    else { 
	/* Only name is given for current directory: */ 
	if (strlen(OutFileName) > 6) OutFileName[6] = 0; 
    } 
 
    /* Open input file: */ 
    if (InFileName != NULL) { 
	if ((GifFileIn = DGifOpenFileName(InFileName)) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
    } 
    else { 
	/* Use the stdin instead: */ 
	if ((GifFileIn = DGifOpenFileHandle(0)) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
    } 
 
    /* Scan the content of GIF file and dump image(s) to seperate file(s): */ 
    do { 
	sprintf(CrntFileName, "%s%02d.gif", OutFileName, FileNum++); 
	if ((GifFileOut = EGifOpenFileName(CrntFileName, TRUE)) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
	FileEmpty = TRUE; 
 
	/* And dump out its exactly same screen information: */ 
	if (EGifPutScreenDesc(GifFileOut, 
	    GifFileIn -> SWidth, GifFileIn -> SHeight, 
	    GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor, 
	    GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR) 
	    QuitGifError(GifFileIn, GifFileOut); 
 
	do { 
	    if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR) 
		QuitGifError(GifFileIn, GifFileOut); 
 
	    switch (RecordType) { 
		case IMAGE_DESC_RECORD_TYPE: 
		    FileEmpty = FALSE; 
		    if (DGifGetImageDesc(GifFileIn) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
		    /* Put same image descriptor to out file: */ 
		    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 is 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: 
		    FileEmpty = FALSE; 
		    /* 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, 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 != IMAGE_DESC_RECORD_TYPE && 
	       RecordType != TERMINATE_RECORD_TYPE); 
 
	if (EGifCloseFile(GifFileOut) == GIF_ERROR) 
	    QuitGifError(GifFileIn, GifFileOut); 
	if (FileEmpty) { 
	    /* Might happen on last file - delete it if so: */ 
	    unlink(CrntFileName); 
	} 
   } 
    while (RecordType != TERMINATE_RECORD_TYPE); 
 
    if (DGifCloseFile(GifFileIn) == 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); 
}