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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber Ver 0.1, Jul. 1989 *
- ******************************************************************************
- * Program to assemble/disassemble GIF files: disassembles multi image file *
- * into seperated files, or assembles few single image GIF files into one. *
- * Options: *
- * -q : quite printing mode. *
- * -a : assemble few files into one (default) *
- * -d name : disassmble given GIF file into seperate files derived from name. *
- * -h : on line help. *
- ******************************************************************************
- * History: *
- * 7 Jul 89 - Version 1.0 by Gershon Elber. *
- *****************************************************************************/
-
- #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 "GifAsm"
-
- #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 = "GifAsm q%- a%- d%-OutFileName!s h%- GifFile(s)!*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%- a%- d%-OutFileName!s h%- GifFile(s)!*s";
- #endif /* SYSV */
-
- static int
- AsmFlag = FALSE;
-
- static void DoAssembly(int NumFiles, char **FileNames);
- static void DoDisassembly(char *InFileName, char *OutFileName);
- 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, DisasmFlag = FALSE, HelpFlag = FALSE;
- char **FileNames = NULL, *OutFileName;
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr,
- &GifQuitePrint, &AsmFlag, &DisasmFlag, &OutFileName,
- &HelpFlag, &NumFiles, &FileNames)) != FALSE) {
- GAPrintErrMsg(Error);
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
-
- if (HelpFlag) {
- fprintf(stderr, VersionStr);
- GAPrintHowTo(CtrlStr);
- exit(0);
- }
-
- if (!AsmFlag && !DisasmFlag) AsmFlag = TRUE; /* Make default - assemble. */
- if (AsmFlag && NumFiles < 2) {
- GIF_MESSAGE("At list two GIF files are required to assembly operation.");
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
- if (!AsmFlag && NumFiles > 1) {
- GIF_MESSAGE("Error in command line parsing - one GIF file please.");
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
-
- if (AsmFlag)
- DoAssembly(NumFiles, FileNames);
- else
- DoDisassembly(NumFiles == 1 ? *FileNames : NULL, OutFileName);
- }
-
- /******************************************************************************
- * Perform the assembly operation - take few input files into one output. *
- ******************************************************************************/
- static void DoAssembly(int NumFiles, char **FileNames)
- {
- int i, ExtCode, CodeSize;
- GifRecordType RecordType;
- GifByteType *Extension, *CodeBlock;
- GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
-
- /* Open stdout for the output file: */
- if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* Scan the content of the GIF file and load the image(s) in: */
- for (i = 0; i < NumFiles; i++) {
- if ((GifFileIn = DGifOpenFileName(FileNames[i])) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* And dump out screen descriptor iff its first image. */
- if (i == 0)
- if (EGifPutScreenDesc(GifFileOut,
- GifFileIn -> SWidth, GifFileIn -> SHeight,
- GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
- GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- 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 image descriptor to out file: */
- if (EGifPutImageDesc(GifFileOut,
- GifFileIn -> ILeft, GifFileIn -> ITop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* Now read image itself in decoded form as we dont */
- /* dont care what is there, and this is much faster. */
- if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
- || EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- while (CodeBlock != NULL)
- if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
- EGifPutCodeNext(GifFileOut, CodeBlock) == 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, 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);
- }
-
- /******************************************************************************
- * Perform the disassembly operation - take one input files into few output. *
- ******************************************************************************/
- static void DoDisassembly(char *InFileName, char *OutFileName)
- {
- int i, ExtCode, CodeSize, FileNum = 0, FileEmpty;
- GifRecordType RecordType;
- char CrntFileName[80], *p;
- GifByteType *Extension, *CodeBlock;
- GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
-
- /* If name has type postfix, strip it out, and make sure name is less */
- /* or equal to 6 chars, so we will have 2 chars in name for numbers. */
- for (i = 0; i < strlen(OutFileName); i++)/* Make sure all is upper case.*/
- if (islower(OutFileName[i]))
- OutFileName[i] = toupper(OutFileName[i]);
-
- if ((p = strrchr(OutFileName, '.')) != NULL && strlen(p) <= 4) p[0] = 0;
- if ((p = strrchr(OutFileName, '/')) != NULL ||
- (p = strrchr(OutFileName, '\\')) != NULL ||
- (p = strrchr(OutFileName, ':')) != NULL) {
- if (strlen(p) > 7) p[7] = 0; /* p includes the '/', '\\', ':' char. */
- }
- else {
- /* Only name is given for current directory: */
- if (strlen(OutFileName) > 6) OutFileName[6] = 0;
- }
-
- /* Open input file: */
- if (InFileName != NULL) {
- if ((GifFileIn = DGifOpenFileName(InFileName)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
- }
- else {
- /* Use the stdin instead: */
- if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
- }
-
- /* Scan the content of GIF file and dump image(s) to seperate file(s): */
- do {
- sprintf(CrntFileName, "%s%02d.gif", OutFileName, FileNum++);
- if ((GifFileOut = EGifOpenFileName(CrntFileName, TRUE)) == NULL)
- QuitGifError(GifFileIn, GifFileOut);
- FileEmpty = TRUE;
-
- /* And dump out its exactly same screen information: */
- if (EGifPutScreenDesc(GifFileOut,
- GifFileIn -> SWidth, GifFileIn -> SHeight,
- GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
- GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- do {
- if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- switch (RecordType) {
- case IMAGE_DESC_RECORD_TYPE:
- FileEmpty = FALSE;
- if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- /* Put same image descriptor to out file: */
- if (EGifPutImageDesc(GifFileOut,
- GifFileIn -> ILeft, GifFileIn -> ITop,
- GifFileIn -> IWidth, GifFileIn -> IHeight,
- GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
- GifFileIn -> IColorMap) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
-
- /* Now read image itself in decoded form as we dont */
- /* really care what is there, and this is much faster. */
- if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR
- || EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- while (CodeBlock != NULL)
- if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR ||
- EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- break;
- case EXTENSION_RECORD_TYPE:
- FileEmpty = FALSE;
- /* 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, 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 != IMAGE_DESC_RECORD_TYPE &&
- RecordType != TERMINATE_RECORD_TYPE);
-
- if (EGifCloseFile(GifFileOut) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- if (FileEmpty) {
- /* Might happen on last file - delete it if so: */
- unlink(CrntFileName);
- }
- }
- while (RecordType != TERMINATE_RECORD_TYPE);
-
- if (DGifCloseFile(GifFileIn) == GIF_ERROR)
- QuitGifError(GifFileIn, GifFileOut);
- }
-
- /******************************************************************************
- * 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);
- }
-