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gifinter.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jul. 1989   *
******************************************************************************
* Program to flip interlaced and non interlaced images in GIF files.         *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -i : Force all images to be intelaced.                         *
* -s : Force all images to be sequencial (non interlaced). This is default.  *
* -h : on-line help                                              *
******************************************************************************
* History:                                                 *
* 5 Jul 89 - Version 1.0 by Gershon Elber.                             *
* 21 Dec 89 - Fix problems with -i and -s flags (Version 1.1).               *
*****************************************************************************/

#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    "GifInter"

#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 = "GifInter q%- i%- s%- h%- GifFile!*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%- i%- s%- h%- GifFile!*s";
#endif /* SYSV */

/* Make some variables global, so we could access them faster: */
static int
    ImageNum = 0,
    SequencialFlag = FALSE,
    InterlacedFlag = FALSE,
    HelpFlag = FALSE,
    InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
    InterlacedJumps[] = { 8, 8, 4, 2 };    /* be read - offsets and jumps... */

static int LoadImage(GifFileType *GifFile, GifRowType **ImageBuffer);
static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer);
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, ExtCode;
    GifRecordType RecordType;
    GifByteType *Extension;
    char **FileName = NULL;
    GifRowType *ImageBuffer;
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL;

    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
            &InterlacedFlag, &SequencialFlag, &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);

    /* And dump out exactly same screen information: */
    if (EGifPutScreenDesc(GifFileOut,
      GifFileIn->SWidth, GifFileIn->SHeight,
      GifFileIn->SColorResolution, GifFileIn->SBackGroundColor,
      GifFileIn->SColorMap) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);

    /* 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);

            /* Put the image descriptor to out file: */
            if (EGifPutImageDesc(GifFileOut,
                GifFileIn->Image.Left, GifFileIn->Image.Top,
                GifFileIn->Image.Width, GifFileIn->Image.Height,
                InterlacedFlag,
                GifFileIn->Image.ColorMap) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);

            /* Load the image (either Interlaced or not), and dump it as */
            /* defined in GifFileOut->Image.Interlaced.                */
            if (LoadImage(GifFileIn, &ImageBuffer) == GIF_ERROR)
                QuitGifError(GifFileIn, GifFileOut);
            if (DumpImage(GifFileOut, ImageBuffer) == 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 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 != TERMINATE_RECORD_TYPE);

    if (DGifCloseFile(GifFileIn) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);
    if (EGifCloseFile(GifFileOut) == GIF_ERROR)
      QuitGifError(GifFileIn, GifFileOut);
}

/******************************************************************************
* Routine to read Image out. The image can be Interlaced or None interlaced.  *
* The memory required to hold the image is allocate by the routine itself.    *
* The image is always loaded sequencially into the buffer.              *
* Return GIF_OK if succesful, GIF_ERROR otherwise.                      *
******************************************************************************/
static int LoadImage(GifFileType *GifFile, GifRowType **ImageBufferPtr)
{
    int Size, i, j, Count;
    GifRowType *ImageBuffer;

    /* Allocate the image as vector of column of rows. We cannt allocate     */
    /* the all screen at once, as this broken minded CPU can allocate up to  */
    /* 64k at a time and our image can be bigger than that:            */
    if ((ImageBuffer = (GifRowType *)
      malloc(GifFile->Image.Height * sizeof(GifRowType *))) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");

    Size = GifFile->Image.Width * sizeof(GifPixelType);/* One row size in bytes.*/
    for (i = 0; i < GifFile->Image.Height; i++) {
      /* Allocate the rows: */
      if ((ImageBuffer[i] = (GifRowType) malloc(Size)) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");
    }

    *ImageBufferPtr = ImageBuffer;

    GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]:     ",
      PROGRAM_NAME, ++ImageNum, GifFile->Image.Left, GifFile->Image.Top,
                         GifFile->Image.Width, GifFile->Image.Height);
    if (GifFile->Image.Interlace) {
      /* Need to perform 4 passes on the images: */
      for (Count = i = 0; i < 4; i++)
          for (j = InterlacedOffset[i]; j < GifFile->Image.Height;
                                     j += InterlacedJumps[i]) {
            GifQprintf("\b\b\b\b%-4d", Count++);
            if (DGifGetLine(GifFile, ImageBuffer[j], GifFile->Image.Width)
                == GIF_ERROR) return GIF_ERROR;
          }
    }
    else {
      for (i = 0; i < GifFile->Image.Height; i++) {
          GifQprintf("\b\b\b\b%-4d", i);
          if (DGifGetLine(GifFile, ImageBuffer[i], GifFile->Image.Width)
            == GIF_ERROR) return GIF_ERROR;
      }
    }

    return GIF_OK;
}

/******************************************************************************
* Routine to dump image out. The given Image buffer should always hold the    *
* image sequencially. Image will be dumped according to IInterlaced flag in   *
* GifFile structure. Once dumped, the memory holding the image is freed.      *
* Return GIF_OK if succesful, GIF_ERROR otherwise.                      *
******************************************************************************/
static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer)
{
    int i, j, Count;

    if (GifFile->Image.Interlace) {
      /* Need to perform 4 passes on the images: */
      for (Count = GifFile->Image.Height, i = 0; i < 4; i++)
          for (j = InterlacedOffset[i]; j < GifFile->Image.Height;
                                     j += InterlacedJumps[i]) {
            GifQprintf("\b\b\b\b%-4d", Count--);
            if (EGifPutLine(GifFile, ImageBuffer[j], GifFile->Image.Width)
                == GIF_ERROR) return GIF_ERROR;
          }
    }
    else {
      for (Count = GifFile->Image.Height, i = 0; i < GifFile->Image.Height; i++) {
          GifQprintf("\b\b\b\b%-4d", Count--);
          if (EGifPutLine(GifFile, ImageBuffer[i], GifFile->Image.Width)
            == GIF_ERROR) return GIF_ERROR;
      }
    }

    /* Free the m emory used for this image: */
    for (i = 0; i < GifFile->Image.Height; i++) free((char *) ImageBuffer[i]);
    free((char *) ImageBuffer);

    return GIF_OK;
}

/******************************************************************************
* 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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