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José David Guillén
2021-09-08 21:26:43 +02:00
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to convert GIF file to RGB 24 bits. *
* Options: *
* -q : quite printing mode. *
* -1 : dump as one file using RGBRGB triples. *
* -h : on line help. *
* -o FileName : specify the output file name(s). *
******************************************************************************
* History: *
* 5 Jan 90 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#ifdef __MSDOS__
#include <graphics.h>
#include <stdlib.h>
#include <alloc.h>
#include <io.h>
#include <dos.h>
#include <bios.h>
#endif /* __MSDOS__ */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "Gif2RGB"
#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 = "Gif2RGB q%- 1%- o%-OutFileName!s h%- GifFile!*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%- 1%- o%-OutFileName!s h%- GifFile!*s";
#endif /* SYSV */
/* Make some variables global, so we could access them faster: */
static int
ImageNum = 0,
BackGround = 0,
OneFileFlag = FALSE,
HelpFlag = FALSE,
ColorMapSize = 0,
InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
static GifColorType
*ColorMap;
static void DumpScreen2RGB(char *FileName, int OneFileFlag,
GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int i, j, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode, Count,
OutFileFlag = FALSE;
GifRecordType RecordType;
GifByteType *Extension;
char *OutFileName,
**FileName = NULL;
GifRowType *ScreenBuffer;
GifFileType *GifFile;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
&OneFileFlag, &OutFileFlag, &OutFileName,
&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 (!OutFileFlag) OutFileName = NULL;
if (NumFiles == 1) {
if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
PrintGifError();
exit(-1);
}
}
else {
/* Use the stdin instead: */
#ifdef __MSDOS__
setmode(0, O_BINARY);
#endif /* __MSDOS__ */
if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
PrintGifError();
exit(-1);
}
}
/* Allocate the screen 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: */
/* Note this screen is device independent - its the screen as defined by */
/* the GIF file parameters itself. */
if ((ScreenBuffer = (GifRowType *)
malloc(GifFile -> SHeight * sizeof(GifRowType *))) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
Size = GifFile -> SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/
if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < GifFile -> SWidth; i++) /* Set its color to BackGround. */
ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
for (i = 1; i < GifFile -> SHeight; i++) {
/* Allocate the other rows, and set their color to background too: */
if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
}
/* Scan the content of the GIF file and load the image(s) in: */
do {
if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
Row = GifFile -> ITop; /* Image Position relative to Screen. */
Col = GifFile -> ILeft;
Width = GifFile -> IWidth;
Height = GifFile -> IHeight;
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth ||
GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) {
fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
exit(-2);
}
if (GifFile -> IInterlace) {
/* Need to perform 4 passes on the images: */
for (Count = i = 0; i < 4; i++)
for (j = Row + InterlacedOffset[i]; j < Row + Height;
j += InterlacedJumps[i]) {
GifQprintf("\b\b\b\b%-4d", Count++);
if (DGifGetLine(GifFile, &ScreenBuffer[j][Col],
Width) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
}
else {
for (i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col],
Width) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
}
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be traps by DGifGetRecordType. */
break;
}
}
while (RecordType != TERMINATE_RECORD_TYPE);
/* Lets dump it - set the global variables required and do it: */
BackGround = GifFile -> SBackGroundColor;
ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap :
GifFile -> SColorMap);
ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel :
GifFile -> SBitsPerPixel);
DumpScreen2RGB(OutFileName, OneFileFlag,
ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight);
if (DGifCloseFile(GifFile) == GIF_ERROR) {
PrintGifError();
exit(-1);
}
}
/******************************************************************************
* The real dumping routine. *
******************************************************************************/
static void DumpScreen2RGB(char *FileName, int OneFileFlag,
GifRowType *ScreenBuffer,
int ScreenWidth, int ScreenHeight)
{
int i, j;
GifRowType GifRow;
static GifColorType
*ColorMapEntry;
FILE *f[3];
if (FileName != NULL) {
char OneFileName[80];
if (OneFileFlag) {
#ifdef __MSDOS__
if ((f[0] = fopen(FileName, "wb")) == NULL)
#else
if ((f[0] = fopen(FileName, "w")) == NULL)
#endif /* __MSDOS__ */
GIF_EXIT("Can't open input file name.");
}
else {
static char *Postfixes[] = { ".R", ".G", ".B" };
for (i = 0; i < 3; i++) {
strcpy(OneFileName, FileName);
strcat(OneFileName, Postfixes[i]);
#ifdef __MSDOS__
if ((f[i] = fopen(OneFileName, "wb")) == NULL)
#else
if ((f[i] = fopen(OneFileName, "w")) == NULL)
#endif /* __MSDOS__ */
GIF_EXIT("Can't open input file name.");
}
}
}
else {
OneFileFlag = TRUE;
#ifdef __MSDOS__
setmode(0, O_BINARY);
#endif /* __MSDOS__ */
f[0] = stdout;
}
if (OneFileFlag) {
unsigned char *Buffer, *BufferP;
if ((Buffer = (unsigned char *) malloc(ScreenWidth * 3)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < ScreenHeight; i++) {
GifRow = ScreenBuffer[i];
GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) {
ColorMapEntry = &ColorMap[GifRow[j]];
*BufferP++ = ColorMapEntry -> Red;
*BufferP++ = ColorMapEntry -> Green;
*BufferP++ = ColorMapEntry -> Blue;
}
if (fwrite(Buffer, ScreenWidth * 3, 1, f[0]) != 1)
GIF_EXIT("Write to file(s) failed.");
}
free((char *) Buffer);
fclose(f[0]);
}
else {
unsigned char *Buffers[3];
if ((Buffers[0] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
(Buffers[1] = (unsigned char *) malloc(ScreenWidth)) == NULL ||
(Buffers[2] = (unsigned char *) malloc(ScreenWidth)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
for (i = 0; i < ScreenHeight; i++) {
GifRow = ScreenBuffer[i];
GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
for (j = 0; j < ScreenWidth; j++) {
ColorMapEntry = &ColorMap[GifRow[j]];
Buffers[0][j] = ColorMapEntry -> Red;
Buffers[1][j] = ColorMapEntry -> Green;
Buffers[2][j] = ColorMapEntry -> Blue;
}
if (fwrite(Buffers[0], ScreenWidth, 1, f[0]) != 1 ||
fwrite(Buffers[1], ScreenWidth, 1, f[1]) != 1 ||
fwrite(Buffers[2], ScreenWidth, 1, f[2]) != 1)
GIF_EXIT("Write to file(s) failed.");
}
free((char *) Buffers[0]);
free((char *) Buffers[1]);
free((char *) Buffers[2]);
fclose(f[0]);
fclose(f[1]);
fclose(f[2]);
}
}