/*****************************************************************************
* "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:
* -v : verbose mode.
* -i : Force all images to be interlaced.
* -s : Force all images to be sequential (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).
*****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "gifinter"
static char
*VersionStr =
PROGRAM_NAME
VERSION_COOKIE
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" v%- i%- s%- h%- GifFile!*s";
/* Make some variables global, so we could access them faster: */
static int
ImageNum = 0,
InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
static bool
SequencialFlag = false,
InterlacedFlag = false,
HelpFlag = false;
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.
******************************************************************************/
int main(int argc, char **argv)
{
int NumFiles, ExtCode;
bool Error;
GifRecordType RecordType;
GifByteType *Extension;
char **FileName = NULL;
GifRowType *ImageBuffer;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifNoisyPrint,
&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(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
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:
/* 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);
return 0;
}
/******************************************************************************
* 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;
GifRowType *ImageBuffer;
/* The following comment was written under DOS on a 286: */
/* Allocate the image as vector of column of rows. We can't allocate the */
/* whole 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) {
int j, Count;
/* 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(EXIT_FAILURE);
}