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416 lines
14 KiB
C
416 lines
14 KiB
C
/*****************************************************************************
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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 assemble/disassemble GIF files: disassembles multi image file *
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* into seperated files, or assembles few single image GIF files into one. *
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* Options: *
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* -q : quiet printing mode. *
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* -A : assemble few files into one as an animation gif. *
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* -a : assemble few files into one (default) *
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* -d name : disassmble given GIF file into seperate files derived from name. *
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* -h : on-line help. *
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******************************************************************************
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* History: *
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* 7 Jul 89 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef __MSDOS__
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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 <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_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 "GifAsm"
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#define GIF_ASM_NAME "NETSCAPE2.0"
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#define COMMENT_GIF_ASM "(c) Gershon Elber, GifLib"
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#define SQR(x) ((x) * (x))
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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 toolkit module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber.\n";
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static char
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*CtrlStr = "GifAsm q%- A%-Delay!d a%- d%-OutFileName!s h%- GifFile(s)!*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.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- A%-Delay!d a%- d%-OutFileName!s h%- GifFile(s)!*s";
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#endif /* SYSV */
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static int
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AsmGifAnimFlag = FALSE,
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AsmGifAnimNumIters = 1,
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AsmGifAnimDelay = 0,
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AsmGifAnimUserWait = FALSE,
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AsmFlag = FALSE;
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#if FALSE
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/* This is apparently not yet an implemented feature of the program */
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static void DoAssemblyGifAnim(int NumFiles, char **FileNames);
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#endif /* FALSE */
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static void DoAssembly(int NumFiles, char **FileNames);
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static void DoDisassembly(char *InFileName, char *OutFileName);
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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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int main(int argc, char **argv)
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{
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int Error, NumFiles, DisasmFlag = FALSE, HelpFlag = FALSE;
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char **FileNames = NULL, *OutFileName;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
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&AsmGifAnimFlag, &AsmGifAnimDelay,
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&AsmFlag, &DisasmFlag, &OutFileName,
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&HelpFlag, &NumFiles, &FileNames)) != FALSE) {
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GAPrintErrMsg(Error);
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GAPrintHowTo(CtrlStr);
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exit(EXIT_FAILURE);
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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(EXIT_SUCCESS);
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}
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if (!AsmFlag && !AsmGifAnimFlag && !DisasmFlag)
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AsmFlag = TRUE; /* Make default - assemble. */
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if ((AsmFlag || AsmGifAnimFlag) && NumFiles < 2) {
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GIF_MESSAGE("At list two GIF files are required to assembly operation.");
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GAPrintHowTo(CtrlStr);
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exit(EXIT_FAILURE);
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}
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if (!AsmFlag && !AsmGifAnimFlag && 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(EXIT_FAILURE);
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}
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if (AsmFlag || AsmGifAnimFlag)
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DoAssembly(NumFiles, FileNames);
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else
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DoDisassembly(NumFiles == 1 ? *FileNames : NULL, OutFileName);
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return 0;
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}
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/******************************************************************************
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* Perform the assembly operation - take few input files into one output. *
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******************************************************************************/
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static void DoAssembly(int NumFiles, char **FileNames)
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{
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int i, j, k, Len = 0, ExtCode, ReMapColor[256];
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ColorMapObject FirstColorMap;
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GifRecordType RecordType;
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GifByteType *Line = NULL, *Extension;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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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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/* Scan the content of the GIF file and load the image(s) in: */
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for (i = 0; i < NumFiles; i++) {
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if ((GifFileIn = DGifOpenFileName(FileNames[i])) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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/* And dump out screen descriptor iff its first image. */
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if (i == 0) {
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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->SColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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FirstColorMap = *GifFileIn->SColorMap;
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FirstColorMap.Colors =
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(GifColorType *) malloc(sizeof(GifColorType) *
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FirstColorMap.ColorCount);
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memcpy(FirstColorMap.Colors, GifFileIn->SColorMap->Colors,
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sizeof(GifColorType) * FirstColorMap.ColorCount);
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if (AsmGifAnimFlag) {
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unsigned char ExtStr[3];
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ExtStr[0] = AsmGifAnimNumIters % 256;
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ExtStr[1] = AsmGifAnimNumIters / 256;
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ExtStr[2] = 0;
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/* Dump application+comment blocks. */
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EGifPutExtensionFirst(GifFileOut, APPLICATION_EXT_FUNC_CODE,
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strlen(GIF_ASM_NAME), GIF_ASM_NAME);
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EGifPutExtensionLast(GifFileOut, APPLICATION_EXT_FUNC_CODE,
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3, ExtStr);
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EGifPutExtension(GifFileOut, COMMENT_EXT_FUNC_CODE,
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strlen(COMMENT_GIF_ASM), COMMENT_GIF_ASM);
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}
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for (j = 0; j < GifFileIn->SColorMap->ColorCount; j++)
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ReMapColor[j] = j;
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}
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else {
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/* Compute the remapping of this image's color map to first one. */
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for (j = 0; j < GifFileIn->SColorMap->ColorCount; j++) {
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int MinIndex = 0,
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MinDist = 3 * 256 * 256;
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GifColorType *CMap1 = FirstColorMap.Colors,
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*c = GifFileIn->SColorMap->Colors;
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/* Find closest color in first color map to this color. */
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for (k = 0; k < FirstColorMap.ColorCount; k++) {
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int Dist = SQR(c[j].Red - CMap1[k].Red) +
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SQR(c[j].Green - CMap1[k].Green) +
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SQR(c[j].Blue - CMap1[k].Blue);
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if (MinDist > Dist) {
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MinDist = Dist;
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MinIndex = k;
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}
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}
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ReMapColor[j] = MinIndex;
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}
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}
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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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if (AsmGifAnimFlag) {
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static unsigned char
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ExtStr[4] = { 0x04, 0x00, 0x00, 0xff };
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ExtStr[0] = AsmGifAnimUserWait ? 0x06 : 0x04;
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ExtStr[1] = AsmGifAnimDelay % 256;
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ExtStr[2] = AsmGifAnimDelay / 256;
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/* Dump graphics control block. */
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EGifPutExtension(GifFileOut, GRAPHICS_EXT_FUNC_CODE,
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4, ExtStr);
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}
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if (i == 0) {
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Len = sizeof(GifPixelType) * GifFileIn->Image.Width;
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if ((Line = (GifRowType) malloc(Len)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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}
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/* Put image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn->Image.Left, GifFileIn->Image.Top,
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GifFileIn->Image.Width, GifFileIn->Image.Height,
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GifFileIn->Image.Interlace,
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GifFileIn->Image.ColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself and remap to global color map. */
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for (k = 0; k < GifFileIn->Image.Height; k++) {
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if (DGifGetLine(GifFileIn, Line, Len) != GIF_ERROR) {
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for (j = 0; j < Len; j++)
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Line[j] = ReMapColor[Line[j]];
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if (EGifPutLine(GifFileOut, Line, Len) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else
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QuitGifError(GifFileIn, GifFileOut);
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}
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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)
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== 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, discard.*/
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while (Extension != NULL)
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if (DGifGetExtensionNext(GifFileIn, &Extension)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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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}
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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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* Perform the disassembly operation - take one input files into few output. *
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******************************************************************************/
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static void DoDisassembly(char *InFileName, char *OutFileName)
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{
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int ExtCode, CodeSize, FileNum = 0, FileEmpty;
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GifRecordType RecordType;
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char CrntFileName[80];
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GifByteType *Extension, *CodeBlock;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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#ifdef __MSDOS__
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int i;
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char *p;
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/* If name has type postfix, strip it out, and make sure name is less */
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/* or equal to 6 chars, so we will have 2 chars in name for numbers. */
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for (i = 0; i < (int)strlen(OutFileName); i++)/* Make sure all is upper case.*/
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if (islower(OutFileName[i]))
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OutFileName[i] = toupper(OutFileName[i]);
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if ((p = strrchr(OutFileName, '.')) != NULL && strlen(p) <= 4) p[0] = 0;
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if ((p = strrchr(OutFileName, '/')) != NULL ||
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(p = strrchr(OutFileName, '\\')) != NULL ||
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(p = strrchr(OutFileName, ':')) != NULL) {
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if (strlen(p) > 7) p[7] = 0; /* p includes the '/', '\\', ':' char. */
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}
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else {
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/* Only name is given for current directory: */
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if (strlen(OutFileName) > 6) OutFileName[6] = 0;
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}
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#endif /* __MSDOS__ */
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/* Open input file: */
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if (InFileName != NULL) {
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if ((GifFileIn = DGifOpenFileName(InFileName)) == 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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/* Scan the content of GIF file and dump image(s) to seperate file(s): */
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do {
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sprintf(CrntFileName, "%s%02d.gif", OutFileName, FileNum++);
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if ((GifFileOut = EGifOpenFileName(CrntFileName, TRUE)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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FileEmpty = TRUE;
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/* And dump out its 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->SColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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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FileEmpty = FALSE;
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if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Put same image descriptor to out file: */
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn->Image.Left, GifFileIn->Image.Top,
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GifFileIn->Image.Width, GifFileIn->Image.Height,
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GifFileIn->Image.Interlace,
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GifFileIn->Image.ColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself in decoded form as we dont */
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/* really care what is there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
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|| EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL)
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
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EGifPutCodeNext(GifFileOut, CodeBlock) == 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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FileEmpty = FALSE;
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFileIn, &ExtCode, &Extension)
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== 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, discard.*/
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while (Extension != NULL)
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if (DGifGetExtensionNext(GifFileIn, &Extension)
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== GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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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 != IMAGE_DESC_RECORD_TYPE &&
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RecordType != TERMINATE_RECORD_TYPE);
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (FileEmpty) {
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/* Might happen on last file - delete it if so: */
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unlink(CrntFileName);
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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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}
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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(EXIT_FAILURE);
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}
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