/*****************************************************************************
* "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: *
* -q : quite printing mode. *
* -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 q%- 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
" q%- 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,
&GifQuitePrint, &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);
}