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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber Ver 0.1, Jun. 1989 *
- ******************************************************************************
- * Program to dump GIF file content as TEXT information *
- * Options: *
- * -c : include the color maps as well. *
- * -e : include encoded information packed as bytes as well. *
- * -z : include encoded information (12bits) codes as result from the zl alg. *
- * -p : dump pixel information instead of encoded information. *
- * -r : same as -p but dump one pixel as one byte in binary form with no *
- * other information. This will create a file of size Width by Height. *
- * -h : on line help. *
- ******************************************************************************
- * History: *
- * 28 Jun 89 - Version 1.0 by Gershon Elber. *
- * 21 Dec 89 - Fix segmentation fault problem in PrintCodeBlock (Version 1.1) *
- * 25 Dec 89 - Add the -r flag for raw output. *
- *****************************************************************************/
-
- #ifdef __MSDOS__
- #include <stdlib.h>
- #include <alloc.h>
- #include <conio.h>
- #include <io.h>
- #endif /* __MSDOS__ */
-
- #include <stdio.h>
- #include <ctype.h>
- #include <fcntl.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "GifText"
-
- #define MAKE_PRINTABLE(c) (isprint(c) ? (c) : ' ')
-
- #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 = "GifText c%- e%- z%- p%- r%- 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
- " c%- e%- z%- p%- r%- h%- GifFile!*s";
- #endif /* SYSV */
-
- static void PrintCodeBlock(GifFileType *GifFile, GifByteType *CodeBlock, int Reset);
- static void PrintPixelBlock(GifByteType *PixelBlock, int Len, int Reset);
- static void PrintExtBlock(GifByteType *Extension, int Reset);
- static void PrintLZCodes(GifFileType *GifFile);
-
- /******************************************************************************
- * Interpret the command line and scan the given GIF file. *
- ******************************************************************************/
- void main(int argc, char **argv)
- {
- int i, j, ExtCode, CodeSize, Error, NumFiles, Len,
- ColorMapFlag = FALSE, EncodedFlag = FALSE, LZCodesFlag = FALSE,
- PixelFlag = FALSE, HelpFlag = FALSE, RawFlag = FALSE, ImageNum = 1;
- char *GifFileName, **FileName = NULL;
- GifPixelType *Line;
- GifRecordType RecordType;
- GifByteType *CodeBlock, *Extension;
- GifFileType *GifFile;
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr, &ColorMapFlag,
- &EncodedFlag, &LZCodesFlag, &PixelFlag, &RawFlag, &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) {
- GifFileName = *FileName;
- if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
- else {
- /* Use the stdin instead: */
- GifFileName = "Stdin";
- if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
-
- /* Because we write binary data - make sure no text will be written. */
- if (RawFlag) {
- ColorMapFlag = EncodedFlag = LZCodesFlag = PixelFlag = FALSE;
- #ifdef __MSDOS__
- setmode(1, O_BINARY); /* Make sure it is in binary mode. */
- #endif /* __MSDOS__ */
- }
- else {
- printf("\n%s:\n\n\tScreen Size - Width = %d, Height = %d.\n",
- GifFileName, GifFile -> SWidth, GifFile -> SHeight);
- printf("\tColorResolution = %d, BitsPerPixel = %d, BackGround = %d.\n",
- GifFile -> SColorResolution, GifFile -> SBitsPerPixel,
- GifFile -> SBackGroundColor);
- if (GifFile -> SColorMap)
- printf("\tHas Global Color Map.\n\n");
- else
- printf("\tNo Global Color Map.\n\n");
- if (ColorMapFlag && GifFile -> SColorMap) {
- printf("\tGlobal Color Map:\n");
- Len = 1 << GifFile -> SBitsPerPixel;
- for (i = 0; i < Len; i+=4) {
- for (j = 0; j < 4 && j < Len; j++) {
- printf("%3d: %02xh %02xh %02xh ", i + j,
- GifFile -> SColorMap[i + j].Red,
- GifFile -> SColorMap[i + j].Green,
- GifFile -> SColorMap[i + j].Blue);
- }
- printf("\n");
- }
- }
- }
-
- 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);
- }
- if (!RawFlag) {
- printf("\nImage #%d:\n\n\tImage Size - Left = %d, Top = %d, Width = %d, Height = %d.\n",
- ImageNum++, GifFile -> ILeft, GifFile -> ITop,
- GifFile -> IWidth, GifFile -> IHeight);
- printf("\tImage is %s",
- GifFile -> IInterlace ? "Interlaced" :
- "Non Interlaced");
- if (GifFile -> IColorMap != NULL)
- printf(", BitsPerPixel = %d.\n",
- GifFile -> IBitsPerPixel);
- else
- printf(".\n");
- if (GifFile -> IColorMap)
- printf("\tImage Has Color Map.\n");
- else
- printf("\tNo Image Color Map.\n");
- if (ColorMapFlag && GifFile -> IColorMap) {
- Len = 1 << GifFile -> IBitsPerPixel;
- for (i = 0; i < Len; i+=4) {
- for (j = 0; j < 4 && j < Len; j++) {
- printf("%3d: %02xh %02xh %02xh ", i + j,
- GifFile -> IColorMap[i + j].Red,
- GifFile -> IColorMap[i + j].Green,
- GifFile -> IColorMap[i + j].Blue);
- }
- printf("\n");
- }
- }
- }
-
- if (EncodedFlag) {
- if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- printf("\nImage LZ compressed Codes (Code Size = %d):\n",
- CodeSize);
- PrintCodeBlock(GifFile, CodeBlock, TRUE);
- while (CodeBlock != NULL) {
- if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- PrintCodeBlock(GifFile, CodeBlock, FALSE);
- }
- }
- else if (LZCodesFlag) {
- PrintLZCodes(GifFile);
- }
- else if (PixelFlag) {
- Line = (GifPixelType *) malloc(GifFile -> IWidth *
- sizeof(GifPixelType));
- for (i = 0; i < GifFile -> IHeight; i++) {
- if (DGifGetLine(GifFile, Line, GifFile -> IWidth)
- == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- PrintPixelBlock(Line, GifFile -> IWidth, i == 0);
- }
- PrintPixelBlock(NULL, GifFile -> IWidth, FALSE);
- free((char *) Line);
- }
- else if (RawFlag) {
- Line = (GifPixelType *) malloc(GifFile -> IWidth *
- sizeof(GifPixelType));
- for (i = 0; i < GifFile -> IHeight; i++) {
- if (DGifGetLine(GifFile, Line, GifFile -> IWidth)
- == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- fwrite(Line, 1, GifFile -> IWidth, stdout);
- }
- free((char *) Line);
- }
- else {
- /* Skip the image: */
- if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- while (CodeBlock != NULL) {
- if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
-
- }
- break;
- case EXTENSION_RECORD_TYPE:
- if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- if (!RawFlag) {
- printf("\nExtension Record (Ext Code = %d [%c]):\n",
- ExtCode, MAKE_PRINTABLE(ExtCode));
- PrintExtBlock(Extension, TRUE);
- }
- while (Extension != NULL) {
- if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- PrintExtBlock(Extension, FALSE);
- }
- break;
- case TERMINATE_RECORD_TYPE:
- break;
- default: /* Should be traps by DGifGetRecordType */
- break;
- }
- }
- while (RecordType != TERMINATE_RECORD_TYPE);
-
- if (DGifCloseFile(GifFile) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
-
- if (!RawFlag) printf("\nGif file terminated normally.\n");
- }
-
- /******************************************************************************
- * Print the given CodeBlock - a string in pascal notation (size in first *
- * place). Save local information so printing can be performed continuously, *
- * or reset to start state if Reset. If CodeBlock is NULL, output is flushed *
- ******************************************************************************/
- static void PrintCodeBlock(GifFileType *GifFile, GifByteType *CodeBlock, int Reset)
- {
- static int CrntPlace = 0, Print = TRUE;
- static long CodeCount = 0;
- char c;
- int i, Percent, Len;
- long NumBytes;
-
- if (Reset || CodeBlock == NULL) {
- if (CodeBlock == NULL) {
- if (CrntPlace > 0) {
- if (Print) printf("\n");
- CodeCount += CrntPlace - 16;
- }
- if (GifFile -> IColorMap)
- NumBytes = ((((long) GifFile -> IWidth) * GifFile -> IHeight)
- * GifFile -> IBitsPerPixel) / 8;
- else
- NumBytes = ((((long) GifFile -> IWidth) * GifFile -> IHeight)
- * GifFile -> SBitsPerPixel) / 8;
- Percent = 100 * CodeCount / NumBytes;
- printf("\nCompression ratio: %ld/%ld (%d%%).\n",
- CodeCount, NumBytes, Percent);
- return;
- }
- CrntPlace = 0;
- CodeCount = 0;
- Print = TRUE;
- }
-
- Len = CodeBlock[0];
- for (i = 1; i <= Len; i++) {
- if (CrntPlace == 0) {
- if (Print) printf("\n%05lxh: ", CodeCount);
- CodeCount += 16;
- }
- #ifdef __MSDOS__
- if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
- #endif /* __MSDOS__ */
- if (Print) printf(" %02xh", CodeBlock[i]);
- if (++CrntPlace >= 16) CrntPlace = 0;
- }
- }
-
- /******************************************************************************
- * Print the given Extension - a string in pascal notation (size in first *
- * place). Save local information so printing can be performed continuously, *
- * or reset to start state if Reset. If Extension is NULL, output is flushed *
- ******************************************************************************/
- static void PrintExtBlock(GifByteType *Extension, int Reset)
- {
- static int CrntPlace = 0, Print = TRUE;
- static long ExtCount = 0;
- static char HexForm[49], AsciiForm[17];
- char c;
- int i, Len;
-
- if (Reset || Extension == NULL) {
- if (Extension == NULL) {
- if (CrntPlace > 0) {
- HexForm[CrntPlace * 3] = 0;
- AsciiForm[CrntPlace] = 0;
- if (Print) printf("\n%05lx: %-49s %-17s\n",
- ExtCount, HexForm, AsciiForm);
- return;
- }
- else if (Print)
- printf("\n");
- }
- CrntPlace = 0;
- ExtCount = 0;
- Print = TRUE;
- }
-
- if (!Print) return;
-
- Len = Extension[0];
- for (i = 1; i <= Len; i++) {
- sprintf(&HexForm[CrntPlace * 3], " %02x", Extension[i]);
- sprintf(&AsciiForm[CrntPlace], "%c", MAKE_PRINTABLE(Extension[i]));
- #ifdef __MSDOS__
- if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
- #endif /* __MSDOS__ */
- if (++CrntPlace == 16) {
- HexForm[CrntPlace * 3] = 0;
- AsciiForm[CrntPlace] = 0;
- if (Print) printf("\n%05lx: %-49s %-17s",
- ExtCount, HexForm, AsciiForm);
- ExtCount += 16;
- CrntPlace = 0;
- }
- }
- }
-
- /******************************************************************************
- * Print the given PixelBlock of length Len. *
- * Save local information so printing can be performed continuously, *
- * or reset to start state if Reset. If PixelBlock is NULL, output is flushed *
- ******************************************************************************/
- static void PrintPixelBlock(GifByteType *PixelBlock, int Len, int Reset)
- {
- static int CrntPlace = 0, Print = TRUE;
- static long ExtCount = 0;
- static char HexForm[49], AsciiForm[17];
- char c;
- int i;
-
- if (Reset || PixelBlock == NULL) {
- if (PixelBlock == NULL) {
- if (CrntPlace > 0) {
- HexForm[CrntPlace * 3] = 0;
- AsciiForm[CrntPlace] = 0;
- if (Print) printf("\n%05lx: %-49s %-17s\n",
- ExtCount, HexForm, AsciiForm);
- }
- else if (Print)
- printf("\n");
- }
- CrntPlace = 0;
- ExtCount = 0;
- Print = TRUE;
- if (PixelBlock == NULL) return;
- }
-
- if (!Print) return;
-
- for (i = 0; i < Len; i++) {
- sprintf(&HexForm[CrntPlace * 3], " %02x", PixelBlock[i]);
- sprintf(&AsciiForm[CrntPlace], "%c", MAKE_PRINTABLE(PixelBlock[i]));
- #ifdef __MSDOS__
- if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
- #endif /* __MSDOS__ */
- if (++CrntPlace == 16) {
- HexForm[CrntPlace * 3] = 0;
- AsciiForm[CrntPlace] = 0;
- if (Print) printf("\n%05lx: %-49s %-17s",
- ExtCount, HexForm, AsciiForm);
- ExtCount += 16;
- CrntPlace = 0;
- }
- }
- }
-
- /******************************************************************************
- * Print the image as LZ codes (each 12bits), until EOF marker is reached. *
- ******************************************************************************/
- static void PrintLZCodes(GifFileType *GifFile)
- {
- char c;
- int Code, Print = TRUE, CrntPlace = 0;
- long CodeCount = 0;
-
- do {
- if (Print && CrntPlace == 0) printf("\n%05lx:", CodeCount);
- if (DGifGetLZCodes(GifFile, &Code) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- if (Print && Code >= 0)
- printf(" %03x", Code); /* EOF Code is returned as -1. */
- CodeCount++;
- if (++CrntPlace >= 16) CrntPlace = 0;
- #ifdef __MSDOS__
- if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
- #endif /* __MSDOS__ */
- }
- while (Code >= 0);
- }
-