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- /*****************************************************************************
- * "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 : quite 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 "getarg.h"
-
- #define PROGRAM_NAME "GifInter"
-
- #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 = "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, Non commercial use only.\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, &GifQuitePrint,
- &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 -> SBitsPerPixel, 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 -> ILeft, GifFileIn -> ITop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- InterlacedFlag, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* Load the image (either Interlaced or not), and dump it as */
- /* defined in GifFileOut -> IInterlaced. */
- 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);
- }
-
- /******************************************************************************
- * 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 -> IHeight * sizeof(GifRowType *))) == NULL)
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- Size = GifFile -> IWidth * sizeof(GifPixelType);/* One row size in bytes.*/
- for (i = 0; i < GifFile -> IHeight; 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 -> ILeft, GifFile -> ITop,
- GifFile -> IWidth, GifFile -> IHeight);
- if (GifFile -> IInterlace) {
- /* Need to perform 4 passes on the images: */
- for (Count = i = 0; i < 4; i++)
- for (j = InterlacedOffset[i]; j < GifFile -> IHeight;
- j += InterlacedJumps[i]) {
- GifQprintf("\b\b\b\b%-4d", Count++);
- if (DGifGetLine(GifFile, ImageBuffer[j], GifFile -> IWidth)
- == GIF_ERROR) return GIF_ERROR;
- }
- }
- else {
- for (i = 0; i < GifFile -> IHeight; i++) {
- GifQprintf("\b\b\b\b%-4d", i);
- if (DGifGetLine(GifFile, ImageBuffer[i], GifFile -> IWidth)
- == 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 -> IInterlace) {
- /* Need to perform 4 passes on the images: */
- for (Count = GifFile -> IHeight, i = 0; i < 4; i++)
- for (j = InterlacedOffset[i]; j < GifFile -> IHeight;
- j += InterlacedJumps[i]) {
- GifQprintf("\b\b\b\b%-4d", Count--);
- if (EGifPutLine(GifFile, ImageBuffer[j], GifFile -> IWidth)
- == GIF_ERROR) return GIF_ERROR;
- }
- }
- else {
- for (Count = GifFile -> IHeight, i = 0; i < GifFile -> IHeight; i++) {
- GifQprintf("\b\b\b\b%-4d", Count--);
- if (EGifPutLine(GifFile, ImageBuffer[i], GifFile -> IWidth)
- == GIF_ERROR) return GIF_ERROR;
- }
- }
-
- /* Free the m emory used for this image: */
- for (i = 0; i < GifFile -> IHeight; 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);
- }
-