/*****************************************************************************
* "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:
* -v : verbose 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.
*****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdbool.h>
#ifdef __MSDOS__
#include <io.h>
#endif /* __MSDOS__ */
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "giftext"
#define MAKE_PRINTABLE(c) (isprint(c) ? (c) : ' ')
static char
*VersionStr =
PROGRAM_NAME
VERSION_COOKIE
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" v%- c%- e%- z%- p%- r%- h%- GifFile!*s";
static void PrintCodeBlock(GifFileType *GifFile, GifByteType *CodeBlock, bool Reset);
static void PrintPixelBlock(GifByteType *PixelBlock, int Len, bool Reset);
static void PrintExtBlock(GifByteType *Extension, bool Reset);
static void PrintLZCodes(GifFileType *GifFile);
/******************************************************************************
* Interpret the command line and scan the given GIF file.
******************************************************************************/
int main(int argc, char **argv)
{
int i, j, ExtCode, CodeSize, NumFiles, Len, ImageNum = 1;
bool Error,
ColorMapFlag = false, EncodedFlag = false, LZCodesFlag = false,
PixelFlag = false, HelpFlag = false, RawFlag = false;
char *GifFileName, **FileName = NULL;
GifPixelType *Line;
GifRecordType RecordType;
GifByteType *CodeBlock, *Extension;
GifFileType *GifFile;
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&GifNoisyPrint, &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(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
if (NumFiles == 1) {
GifFileName = *FileName;
if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
PrintGifError();
exit(EXIT_FAILURE);
}
}
else {
/* Use the stdin instead: */
GifFileName = "Stdin";
if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
PrintGifError();
exit(EXIT_FAILURE);
}
}
/* 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->SColorMap ? GifFile->SColorMap->BitsPerPixel : 0,
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 = GifFile->SColorMap->ColorCount;
for (i = 0; i < Len; i+=4) {
for (j = 0; j < 4 && j < Len; j++) {
printf("%3d: %02xh %02xh %02xh ", i + j,
GifFile->SColorMap->Colors[i + j].Red,
GifFile->SColorMap->Colors[i + j].Green,
GifFile->SColorMap->Colors[i + j].Blue);
}
printf("\n");
}
}
}
do {
if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
if (!RawFlag) {
printf("\nImage #%d:\n\n\tImage Size - Left = %d, Top = %d, Width = %d, Height = %d.\n",
ImageNum++, GifFile->Image.Left, GifFile->Image.Top,
GifFile->Image.Width, GifFile->Image.Height);
printf("\tImage is %s",
GifFile->Image.Interlace ? "Interlaced" :
"Non Interlaced");
if (GifFile->Image.ColorMap != NULL)
printf(", BitsPerPixel = %d.\n",
GifFile->Image.ColorMap->BitsPerPixel);
else
printf(".\n");
if (GifFile->Image.ColorMap)
printf("\tImage Has Color Map.\n");
else
printf("\tNo Image Color Map.\n");
if (ColorMapFlag && GifFile->Image.ColorMap) {
Len = 1 << GifFile->Image.ColorMap->BitsPerPixel;
for (i = 0; i < Len; i+=4) {
for (j = 0; j < 4 && j < Len; j++) {
printf("%3d: %02xh %02xh %02xh ", i + j,
GifFile->Image.ColorMap->Colors[i + j].Red,
GifFile->Image.ColorMap->Colors[i + j].Green,
GifFile->Image.ColorMap->Colors[i + j].Blue);
}
printf("\n");
}
}
}
if (EncodedFlag) {
if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
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(EXIT_FAILURE);
}
PrintCodeBlock(GifFile, CodeBlock, false);
}
}
else if (LZCodesFlag) {
PrintLZCodes(GifFile);
}
else if (PixelFlag) {
Line = (GifPixelType *) malloc(GifFile->Image.Width *
sizeof(GifPixelType));
for (i = 0; i < GifFile->Image.Height; i++) {
if (DGifGetLine(GifFile, Line, GifFile->Image.Width)
== GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
PrintPixelBlock(Line, GifFile->Image.Width, i == 0);
}
PrintPixelBlock(NULL, GifFile->Image.Width, false);
free((char *) Line);
}
else if (RawFlag) {
Line = (GifPixelType *) malloc(GifFile->Image.Width *
sizeof(GifPixelType));
for (i = 0; i < GifFile->Image.Height; i++) {
if (DGifGetLine(GifFile, Line, GifFile->Image.Width)
== GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
fwrite(Line, 1, GifFile->Image.Width, stdout);
}
free((char *) Line);
}
else {
/* Skip the image: */
if (DGifGetCode(GifFile, &CodeSize, &CodeBlock) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
while (CodeBlock != NULL) {
if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
}
}
break;
case EXTENSION_RECORD_TYPE:
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
if (!RawFlag) {
putchar('\n');
switch (ExtCode)
{
case COMMENT_EXT_FUNC_CODE:
printf("GIF89 comment");
break;
case GRAPHICS_EXT_FUNC_CODE:
printf("GIF89 graphics control");
break;
case PLAINTEXT_EXT_FUNC_CODE:
printf("GIF89 plaintext");
break;
case APPLICATION_EXT_FUNC_CODE:
printf("GIF89 application block");
break;
default:
printf("Extension record of unknown type");
break;
}
printf(" (Ext Code = %d [%c]):\n",
ExtCode, MAKE_PRINTABLE(ExtCode));
PrintExtBlock(Extension, true);
}
for (;;) {
if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
if (Extension == NULL)
break;
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(EXIT_FAILURE);
}
if (!RawFlag) printf("\nGif file terminated normally.\n");
return 0;
}
/******************************************************************************
* 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, bool Reset)
{
static int CrntPlace = 0;
static long CodeCount = 0;
int i, Percent, Len;
long NumBytes;
if (Reset || CodeBlock == NULL) {
if (CodeBlock == NULL) {
if (CrntPlace > 0) {
printf("\n");
CodeCount += CrntPlace - 16;
}
if (GifFile->Image.ColorMap)
NumBytes = ((((long) GifFile->Image.Width) * GifFile->Image.Height)
* GifFile->Image.ColorMap->BitsPerPixel) / 8;
else
NumBytes = ((((long) GifFile->Image.Width) * GifFile->Image.Height)
* GifFile->SColorMap->BitsPerPixel) / 8;
Percent = 100 * CodeCount / NumBytes;
printf("\nCompression ratio: %ld/%ld (%d%%).\n",
CodeCount, NumBytes, Percent);
return;
}
CrntPlace = 0;
CodeCount = 0;
}
Len = CodeBlock[0];
for (i = 1; i <= Len; i++) {
if (CrntPlace == 0) {
printf("\n%05lxh: ", CodeCount);
CodeCount += 16;
}
(void)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, bool Reset)
{
static int CrntPlace = 0;
static long ExtCount = 0;
static char HexForm[49], AsciiForm[17];
if (Reset || Extension == NULL) {
if (Extension == NULL) {
if (CrntPlace > 0) {
HexForm[CrntPlace * 3] = 0;
AsciiForm[CrntPlace] = 0;
printf("\n%05lx: %-49s %-17s\n", ExtCount, HexForm, AsciiForm);
return;
}
else
printf("\n");
}
CrntPlace = 0;
ExtCount = 0;
}
if (Extension != NULL) {
int i, Len;
Len = Extension[0];
for (i = 1; i <= Len; i++) {
(void)snprintf(&HexForm[CrntPlace * 3], 3,
" %02x", Extension[i]);
(void)snprintf(&AsciiForm[CrntPlace], 3,
"%c", MAKE_PRINTABLE(Extension[i]));
if (++CrntPlace == 16) {
HexForm[CrntPlace * 3] = 0;
AsciiForm[CrntPlace] = 0;
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, bool Reset)
{
static int CrntPlace = 0;
static long ExtCount = 0;
static char HexForm[49], AsciiForm[17];
int i;
if (Reset || PixelBlock == NULL) {
if (PixelBlock == NULL) {
if (CrntPlace > 0) {
HexForm[CrntPlace * 3] = 0;
AsciiForm[CrntPlace] = 0;
printf("\n%05lx: %-49s %-17s\n", ExtCount, HexForm, AsciiForm);
}
else
printf("\n");
}
CrntPlace = 0;
ExtCount = 0;
if (PixelBlock == NULL) return;
}
for (i = 0; i < Len; i++) {
(void)snprintf(&HexForm[CrntPlace * 3], 3,
" %02x", PixelBlock[i]);
(void)snprintf(&AsciiForm[CrntPlace], 3,
"%c", MAKE_PRINTABLE(PixelBlock[i]));
if (++CrntPlace == 16) {
HexForm[CrntPlace * 3] = 0;
AsciiForm[CrntPlace] = 0;
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)
{
int Code, CrntPlace = 0;
long CodeCount = 0;
do {
if (CrntPlace == 0) printf("\n%05lx:", CodeCount);
if (DGifGetLZCodes(GifFile, &Code) == GIF_ERROR) {
PrintGifError();
exit(EXIT_FAILURE);
}
if (Code >= 0)
printf(" %03x", Code); /* EOF Code is returned as -1. */
CodeCount++;
if (++CrntPlace >= 16) CrntPlace = 0;
}
while (Code >= 0);
}