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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 : quiet 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 <stdlib.h>
#include <alloc.h>
#endif /* __MSDOS__ */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "gif_lib.h"
#include "gagetarg.h"

#define PROGRAM_NAME    "GifAsm"

#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 = "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.\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,
            &GifQuietPrint, &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->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->Image.Left, GifFileIn->Image.Top,
                  GifFileIn->Image.Width, GifFileIn->Image.Height,
                  GifFileIn->Image.Interlace,
                  GifFileIn->Image.ColorMap) == 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:
                /* Copy the extension header */
                if (DGifGetExtension(GifFileIn, &ExtCode, &Extension)
                  == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
                if (EGifPutExtensionHeader(GifFileOut, ExtCode) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);

                /* Copy extension data blocks */
                while (Extension != NULL) {
                    if (EGifPutExtensionBlock(GifFileOut, Extension[0],
                      Extension+1) == GIF_ERROR)
                          QuitGifError(GifFileIn, GifFileOut);
                  if (DGifGetExtensionNext(GifFileIn, &Extension)
                      == GIF_ERROR)
                        QuitGifError(GifFileIn, GifFileOut);
                }
                /* Close the extension with a 0 length data block */
                if (EGifPutExtensionBlock(GifFileOut, 0, NULL) == 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;

#ifdef __MSDOS__
    /* 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 < (int)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;
    }
#endif /* __MSDOS__ */

    /* 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->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->Image.Left, GifFileIn->Image.Top,
                  GifFileIn->Image.Width, GifFileIn->Image.Height,
                  GifFileIn->Image.Interlace,
                  GifFileIn->Image.ColorMap) == 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;
                /* Copy the extension header */
                if (DGifGetExtension(GifFileIn, &ExtCode, &Extension)
                  == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);
                if (EGifPutExtensionHeader(GifFileOut, ExtCode) == GIF_ERROR)
                  QuitGifError(GifFileIn, GifFileOut);

                /* Copy the extension data blocks */
                while (Extension != NULL) {
                  if (EGifPutExtensionBlock(GifFileOut, Extension[0],
                      Extension+1) == GIF_ERROR)
                        QuitGifError(GifFileIn, GifFileOut);
                  if (DGifGetExtensionNext(GifFileIn, &Extension)
                      == GIF_ERROR)
                      QuitGifError(GifFileIn, GifFileOut);
                }
                /* Close the extension with a 0 length data block */
                if (EGifPutExtensionBlock(GifFileOut, 0, NULL) == 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);
}

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