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G/UTIL/GIFASM.C
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314
G/UTIL/GIFASM.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 assemble/disassemble GIF files: disassembles multi image file *
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* into seperated files, or assembles few single image GIF files into one. *
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* Options: *
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* -q : quite printing mode. *
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* -a : assemble few files into one (default) *
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* -d name : disassmble given GIF file into seperate files derived from name. *
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* -h : on line help. *
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******************************************************************************
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* History: *
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* 7 Jul 89 - 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 "GifAsm"
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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 = "GifAsm q%- a%- d%-OutFileName!s h%- GifFile(s)!*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%- a%- d%-OutFileName!s h%- GifFile(s)!*s";
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#endif /* SYSV */
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static int
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AsmFlag = FALSE;
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static void DoAssembly(int NumFiles, char **FileNames);
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static void DoDisassembly(char *InFileName, char *OutFileName);
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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 Error, NumFiles, DisasmFlag = FALSE, HelpFlag = FALSE;
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char **FileNames = NULL, *OutFileName;
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if ((Error = GAGetArgs(argc, argv, CtrlStr,
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&GifQuitePrint, &AsmFlag, &DisasmFlag, &OutFileName,
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&HelpFlag, &NumFiles, &FileNames)) != FALSE) {
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GAPrintErrMsg(Error);
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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 (!AsmFlag && !DisasmFlag) AsmFlag = TRUE; /* Make default - assemble. */
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if (AsmFlag && NumFiles < 2) {
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GIF_MESSAGE("At list two GIF files are required to assembly operation.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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}
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if (!AsmFlag && 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 (AsmFlag)
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DoAssembly(NumFiles, FileNames);
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else
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DoDisassembly(NumFiles == 1 ? *FileNames : NULL, OutFileName);
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}
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/******************************************************************************
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* Perform the assembly operation - take few input files into one output. *
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******************************************************************************/
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static void DoAssembly(int NumFiles, char **FileNames)
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{
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int i, ExtCode, CodeSize;
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GifRecordType RecordType;
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GifByteType *Extension, *CodeBlock;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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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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/* Scan the content of the GIF file and load the image(s) in: */
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for (i = 0; i < NumFiles; i++) {
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if ((GifFileIn = DGifOpenFileName(FileNames[i])) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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/* And dump out screen descriptor iff its first image. */
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if (i == 0)
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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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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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/* Put image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself in decoded form as we dont */
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/* dont care what is there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
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|| EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL)
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
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EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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)
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== 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, discard.*/
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while (Extension != NULL)
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if (DGifGetExtensionNext(GifFileIn, &Extension)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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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}
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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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* Perform the disassembly operation - take one input files into few output. *
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******************************************************************************/
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static void DoDisassembly(char *InFileName, char *OutFileName)
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{
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int i, ExtCode, CodeSize, FileNum = 0, FileEmpty;
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GifRecordType RecordType;
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char CrntFileName[80], *p;
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GifByteType *Extension, *CodeBlock;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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/* If name has type postfix, strip it out, and make sure name is less */
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/* or equal to 6 chars, so we will have 2 chars in name for numbers. */
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for (i = 0; i < strlen(OutFileName); i++)/* Make sure all is upper case.*/
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if (islower(OutFileName[i]))
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OutFileName[i] = toupper(OutFileName[i]);
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if ((p = strrchr(OutFileName, '.')) != NULL && strlen(p) <= 4) p[0] = 0;
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if ((p = strrchr(OutFileName, '/')) != NULL ||
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(p = strrchr(OutFileName, '\\')) != NULL ||
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(p = strrchr(OutFileName, ':')) != NULL) {
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if (strlen(p) > 7) p[7] = 0; /* p includes the '/', '\\', ':' char. */
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}
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else {
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/* Only name is given for current directory: */
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if (strlen(OutFileName) > 6) OutFileName[6] = 0;
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}
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/* Open input file: */
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if (InFileName != NULL) {
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if ((GifFileIn = DGifOpenFileName(InFileName)) == 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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/* Scan the content of GIF file and dump image(s) to seperate file(s): */
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do {
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sprintf(CrntFileName, "%s%02d.gif", OutFileName, FileNum++);
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if ((GifFileOut = EGifOpenFileName(CrntFileName, TRUE)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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FileEmpty = TRUE;
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/* And dump out its 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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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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FileEmpty = FALSE;
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if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Put same image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself in decoded form as we dont */
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/* really care what is there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
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|| EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL)
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
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EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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break;
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case EXTENSION_RECORD_TYPE:
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FileEmpty = FALSE;
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFileIn, &ExtCode, &Extension)
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== 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, discard.*/
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while (Extension != NULL)
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if (DGifGetExtensionNext(GifFileIn, &Extension)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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 != IMAGE_DESC_RECORD_TYPE &&
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RecordType != TERMINATE_RECORD_TYPE);
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (FileEmpty) {
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/* Might happen on last file - delete it if so: */
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unlink(CrntFileName);
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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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}
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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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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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