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268
G/UTIL/GIFINTER.C
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268
G/UTIL/GIFINTER.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 flip interlaced and non interlaced images in GIF files. *
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* Options: *
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* -q : quite printing mode. *
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* -i : Force all images to be intelaced. *
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* -s : Force all images to be sequencial (non interlaced). This is default. *
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* -h : on line help *
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******************************************************************************
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* History: *
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* 5 Jul 89 - Version 1.0 by Gershon Elber. *
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* 21 Dec 89 - Fix problems with -i and -s flags (Version 1.1). *
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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 "GifInter"
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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 = "GifInter q%- i%- s%- h%- GifFile!*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%- i%- s%- h%- GifFile!*s";
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#endif /* SYSV */
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/* Make some variables global, so we could access them faster: */
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static int
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ImageNum = 0,
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SequencialFlag = FALSE,
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InterlacedFlag = FALSE,
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HelpFlag = FALSE,
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InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
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InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
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static int LoadImage(GifFileType *GifFile, GifRowType **ImageBuffer);
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static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer);
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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, ExtCode;
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GifRecordType RecordType;
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GifByteType *Extension;
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char **FileName = NULL;
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GifRowType *ImageBuffer;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&InterlacedFlag, &SequencialFlag, &HelpFlag,
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&NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (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 (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 (NumFiles == 1) {
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if ((GifFileIn = DGifOpenFileName(*FileName)) == 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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/* 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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/* And dump out 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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/* Scan the content of the GIF file and load the image(s) in: */
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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 the 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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InterlacedFlag, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Load the image (either Interlaced or not), and dump it as */
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/* defined in GifFileOut -> IInterlaced. */
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if (LoadImage(GifFileIn, &ImageBuffer) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (DumpImage(GifFileOut, ImageBuffer) == 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) == 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, so discard: */
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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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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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/******************************************************************************
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* Routine to read Image out. The image can be Interlaced or None interlaced. *
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* The memory required to hold the image is allocate by the routine itself. *
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* The image is always loaded sequencially into the buffer. *
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* Return GIF_OK if succesful, GIF_ERROR otherwise. *
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******************************************************************************/
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static int LoadImage(GifFileType *GifFile, GifRowType **ImageBufferPtr)
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{
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int Size, i, j, Count;
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GifRowType *ImageBuffer;
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/* Allocate the image as vector of column of rows. We cannt allocate */
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/* the all screen at once, as this broken minded CPU can allocate up to */
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/* 64k at a time and our image can be bigger than that: */
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if ((ImageBuffer = (GifRowType *)
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malloc(GifFile -> IHeight * sizeof(GifRowType *))) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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Size = GifFile -> IWidth * sizeof(GifPixelType);/* One row size in bytes.*/
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for (i = 0; i < GifFile -> IHeight; i++) {
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/* Allocate the rows: */
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if ((ImageBuffer[i] = (GifRowType) malloc(Size)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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}
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*ImageBufferPtr = ImageBuffer;
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GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, ++ImageNum, GifFile -> ILeft, GifFile -> ITop,
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GifFile -> IWidth, GifFile -> IHeight);
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if (GifFile -> IInterlace) {
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/* Need to perform 4 passes on the images: */
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for (Count = i = 0; i < 4; i++)
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for (j = InterlacedOffset[i]; j < GifFile -> IHeight;
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j += InterlacedJumps[i]) {
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GifQprintf("\b\b\b\b%-4d", Count++);
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if (DGifGetLine(GifFile, ImageBuffer[j], GifFile -> IWidth)
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== GIF_ERROR) return GIF_ERROR;
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}
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}
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else {
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for (i = 0; i < GifFile -> IHeight; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (DGifGetLine(GifFile, ImageBuffer[i], GifFile -> IWidth)
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== GIF_ERROR) return GIF_ERROR;
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}
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}
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return GIF_OK;
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}
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/******************************************************************************
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* Routine to dump image out. The given Image buffer should always hold the *
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* image sequencially. Image will be dumped according to IInterlaced flag in *
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* GifFile structure. Once dumped, the memory holding the image is freed. *
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* Return GIF_OK if succesful, GIF_ERROR otherwise. *
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******************************************************************************/
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static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer)
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{
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int i, j, Count;
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if (GifFile -> IInterlace) {
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/* Need to perform 4 passes on the images: */
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for (Count = GifFile -> IHeight, i = 0; i < 4; i++)
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for (j = InterlacedOffset[i]; j < GifFile -> IHeight;
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j += InterlacedJumps[i]) {
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GifQprintf("\b\b\b\b%-4d", Count--);
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if (EGifPutLine(GifFile, ImageBuffer[j], GifFile -> IWidth)
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== GIF_ERROR) return GIF_ERROR;
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}
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}
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else {
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for (Count = GifFile -> IHeight, i = 0; i < GifFile -> IHeight; i++) {
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GifQprintf("\b\b\b\b%-4d", Count--);
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if (EGifPutLine(GifFile, ImageBuffer[i], GifFile -> IWidth)
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== GIF_ERROR) return GIF_ERROR;
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}
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}
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/* Free the m emory used for this image: */
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for (i = 0; i < GifFile -> IHeight; i++) free((char *) ImageBuffer[i]);
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free((char *) ImageBuffer);
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return GIF_OK;
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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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