Category : C Source Code
Archive   : GIF_LIB.ZIP
Filename : GIFTEXT.C

/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC 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. *
* -h : on line help. *
******************************************************************************
* History: *
* 28 Jun 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/

#include
#include
#include
#include
#include
#include
#include "gif_lib.h"
#include "getarg.h"

#define PROGRAM_NAME "GifText"
#define VERSION "á Version 1.0, "

#define MAKE_PRINTABLE(c) (isprint(c) ? (c) : ' ')

extern unsigned int
_stklen = 16384; /* Increase default stack size */

static char
*VersionStr =
PROGRAM_NAME
" IBMPC "
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%- h%- GifFile!*s";

static void PrintCodeBlock(GifFileType *GifFile, ByteType *CodeBlock, int Reset);
static void PrintPixelBlock(ByteType *PixelBlock, int Len, int Reset);
static void PrintExtBlock(ByteType *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, ImageNum = 1;
char *GifFileName, **FileName = NULL;
PixelType *Line;
GifRecordType RecordType;
ByteType *CodeBlock, *Extension;
GifFileType *GifFile;

if ((Error = GAGetArgs(argc, argv, CtrlStr, &ColorMapFlag,
&EncodedFlag, &LZCodesFlag, &PixelFlag, &HelpFlag, &NumFiles,
&FileName)) != FALSE || (NumFiles > 1 && !HelpFlag)) {
if (Error) GAPrintErrMsg(Error);
else
if (NumFiles > 1)
MESSAGE("Error in command line parsing - one GIF file please\n");
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);
}
}

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) == ERROR) {
PrintGifError();
exit(-1);
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFile) == ERROR) {
PrintGifError();
exit(-1);
}
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) == 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) == ERROR) {
PrintGifError();
exit(-1);
}
PrintCodeBlock(GifFile, CodeBlock, FALSE);
}
}
else
if (LZCodesFlag) {
PrintLZCodes(GifFile);
}
else
if (PixelFlag) {
Line = (PixelType *) malloc(GifFile -> IWidth *
sizeof(PixelType));
for (i=0; i IHeight; i++) {
if (DGifGetLine(GifFile, Line, GifFile -> IWidth)
== ERROR) {
PrintGifError();
exit(-1);
}
PrintPixelBlock(Line, GifFile -> IWidth, i == 0);
}
PrintPixelBlock(NULL, GifFile -> IWidth, FALSE);
free((char *) Line);
}
else {
/* Skip the image: */
if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == ERROR) {
PrintGifError();
exit(-1);
}
while (CodeBlock != NULL) {
if (DGifGetCodeNext(GifFile, &CodeBlock) == ERROR) {
PrintGifError();
exit(-1);
}
}

}
break;
case EXTENSION_RECORD_TYPE:
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == ERROR) {
PrintGifError();
exit(-1);
}
printf("\nExtension Record (Ext Code = %d [%c]):\n",
ExtCode, MAKE_PRINTABLE(ExtCode));
PrintExtBlock(Extension, TRUE);
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFile, &Extension) == 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) == ERROR) {
PrintGifError();
exit(-1);
}

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, ByteType *CodeBlock, int Reset)
{
static int CrntPlace = 0, Print = TRUE;
static long CodeCount = 0;
char c;
int i, Percent, Len = CodeBlock[0];
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;
}

for (i = 1; i <= Len; i++) {
if (CrntPlace == 0) {
if (Print) printf("\n%05lxh: ", CodeCount);
CodeCount += 16;
}
if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
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(ByteType *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]));
if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
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(ByteType *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]));
if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
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) == ERROR) {
PrintGifError();
exit(-1);
}
if (Print && Code >= 0)
printf(" %03x", Code); /* EOF Code is returned as -1 */
CodeCount++;
if (++CrntPlace >= 16) CrntPlace = 0;
if (kbhit() && ((c = getch()) == 'q' || c == 'Q')) Print = FALSE;
}
while (Code >= 0);
}