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/*
** GIFtrans v1.12
**
** Convert any GIF file into a GIF89a
** Allows for setting the transparent or background color, changing colors,
** adding or removing comments. Also code to analyze GIF contents.
**
** Copyright (c) 24.2.94 by Andreas Ley <ley@rz.uni-karlsruhe.de>
**
** Permission to use, copy, modify, and distribute this software for any
** purpose and without fee is hereby granted, provided that the above
** copyright notice appears in all copies. This software is provided "as is"
** and without any express or implied warranties.
**
** This program has been tested on a HP9000/715 with HP-UX A.09.05
** In this environment, neither lint -u nor gcc -Wall produce any messages.
** It has also been compiled on AIX 3.2 and Solaris 2.3.
** If you encounter any errors or need to make any changes to port it
** to another platform, please contact me.
**
** Known bugs:
** -B flag won't work if there's an Extension between the Global Color
** Table and the Image Descriptor (or Graphic Control Extension). If -V
** has been specified, a Warning Message will be displayed.
** Will be fixed in 2.0 (if ever)
** -D option may output changed data instead of original data, use
** with caution, best only with then -L option.
**
** Version history
**
** Version 1.12 - 17.2.95
** Incorporated dumpcomment by omerzu@quantum.de (Thomas Omerzu)
** Outputs original version if newer than GIF89a.
**
** Version 1.11.2 - 14.12.94
** Incorporated OS/2 port by k.rusch@ieee.org (Klaus Johannes Rusch)
** Different rgb.txt file for OS/2, setmode replaced by freopen for
** OS/2 (SAA C)
**
** Version 1.11.1 - 11.8.94
** Allows for use of the -g option without the -B option.
**
** Version 1.11 - 21.7.94
** Moved Plain Text Extension to the Extensions section where it belongs.
** Accept Unknown Extension Labels.
** Incorporated MS-DOS port by enzo@hk.net (Enzo Michelangeli).
** Added -o and -e options to redirect stdout and stderr.
** Added -D debug flag.
**
** Version 1.10.2 - 22.6.94
** Support for -DRGBTXT flag.
**
** Version 1.10.1 - 21.6.94
** Different rgb.txt file FreeBSD/386BSD.
**
** Version 1.10 - 19.6.94
** Added -g option to change a color in the global color table.
** Added -B option to change the color for the transparent color index.
**
** Version 1.9.1 - 7.6.94
** Different rgb.txt files for X11 and Open Windows.
**
** Version 1.9 - 1.6.94
** Fixed a bug which caused color names to be rejected.
**
** Version 1.8 - 30.5.94
** Accept #rrggbb style arguments.
** Do nothing if rgb-color not found in GIF.
**
** Version 1.7 - 16.5.94
** Added -l option to only list the color table.
** Added -L option for verbose output without creating a gif.
** Added -b option to change the background color index.
** Display all matching color names for color table entries.
** Fixed a bug which caused bad color names if rgb.txt starts with
** whitespace.
** Doesn't use strdup anymore.
** Fixed =& bug on dec machines.
**
** Version 1.6 - 5.4.94
** Added color names recognition.
**
** Version 1.5 - 15.3.94
** Added basic verbose output to analyze GIFs.
**
** Version 1.4 - 8.3.94
** Fixed off-by-one bug in Local Color table code.
** Added -c and -C options to add or remove a comment.
** Transparency is no longer the default.
**
** Thanx for bug reports, ideas and fixes to
** patricka@cs.kun.nl (Patrick Atoon)
** wes@msc.edu (Wes Barris)
** pmfitzge@ingr.com (Patrick M. Fitzgerald)
** hoesel@chem.rug.nl (Frans van Hoesel)
** boardman@jerry.sal.wisc.edu (Dan Boardman)
** krweiss@chip.ucdavis.edu (Ken Weiss)
** chuck.musciano@harris.com (Chuck Musciano)
** heycke@camis.stanford.edu (Torsten Heycke)
** claw@spacsun.rice.edu (Colin Law)
** jwalker@eos.ncsu.edu (Joseph C. Walker)
** Bjorn.Borud@alkymi.unit.no (Bjorn Borud)
** Christopher.Vance@adfa.oz.au (CJS Vance)
** pederl@norway.hp.com (Peder Langlo)
** I.Rutson@bradford.ac.uk (Ian Rutson)
** Nicolas.Pioch@enst.fr (Nicolas Pioch)
** john@charles.CS.UNLV.EDU (John Kilburg)
** enzo@hk.net (Enzo Michelangeli)
** twv@hpwtwe0.cup.hp.com (Terry von Gease)
** k.rusch@ieee.org (Klaus Johannes Rusch)
** omerzu@quantum.de (Thomas Omerzu)
**
** Original distribution site is
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/giftrans.c
** A man-page by knordlun@fltxa.helsinki.fi (Kai Nordlund) is at
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/giftrans.1
** To compile for MS-DOS or OS/2, you need getopt:
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/getopt.c
** MS-DOS executable can be found at
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/giftrans.exe
** OS/2 executable can be found at
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/giftrans.os2.exe
** A template rgb.txt for use with the MS-DOS version can be found at
** ftp://ftp.rz.uni-karlsruhe.de/pub/net/www/tools/rgb.txt
** Additional info can be found on
** http://melmac.corp.harris.com/transparent_images.html
** The GIF file format is documented in
** ftp://ftp.uu.net/doc/literary/obi/Standards/Graphics/Formats/gif89a.doc.Z
*/
#ifndef NeXT
#define X11 /* When using X Window System */
#endif
#undef OPENWIN /* When using Open Windows */
#undef X386 /* When using XFree86 with FreeBSD/386BSD */
#undef OS2 /* When using IBM C/C++ 2.0 */
#ifndef MSDOS /* required for TurboC 1.0 */
#undef MSDOS /* When using Borland C (maybe MSC too) */
#endif
#ifndef OS2_OR_MSDOS
#ifdef OS2
#define OS2_OR_MSDOS
#endif /* OS2 */
#ifdef MSDOS
#define OS2_OR_MSDOS
#endif /* MSDOS */
#endif /* OS2_OR_MSDOS */
char copyright[] = "@(#)(c) Copyright 1994 by Andreas Ley (ley@rz.uni-karlsruhe.de)";
char sccsid[] = "@(#)GIFtrans v1.12 - Transpose GIF files";
#ifndef RGBTXT
#ifdef NeXT
#define RGBTXT "/usr/local/etc/rgb.txt"
#else X11
#define RGBTXT "/usr/lib/X11/rgb.txt"
#else /* X11 */
#ifdef OPENWIN
#define RGBTXT "/usr/openwin/lib/rgb.txt"
#else /* OPENWIN */
#ifdef X386
#define RGBTXT "/usr/X386/lib/X11/rgb.txt"
#else /* X386 */
#ifdef OS2_OR_MSDOS
#define RGBTXT "rgb.txt"
#else /* OS2_OR_MSDOS */
#define RGBTXT "";
#endif /* OS2_OR_MSDOS */
#endif /* X386 */
#endif /* OPENWIN */
#endif /* X11 */
#endif /* RGBTXT */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifndef OS2_OR_MSDOS
#include <unistd.h>
#include <ctype.h>
#include <sys/param.h>
#else /* OS2_OR_MSDOS */
#include <fcntl.h>
#ifdef OS2
#include <io.h>
#endif /* OS2 */
#include "getopt.c"
#endif /* OS2_OR_MSDOS */
#ifndef MAXPATHLEN
#define MAXPATHLEN 256
#endif /* MAXPATHLEN */
#include <libc.h>
#ifndef FALSE
#define FALSE (0) /* This is the naked Truth */
#define TRUE (1) /* and this is the Light */
#endif
#define SUCCESS (0)
#define FAILURE (1)
struct entry {
struct entry *next;
char *name;
int red;
int green;
int blue;
} *root;
#define NONE (-1)
#define OTHER (-2)
#define RGB (-3)
struct color {
int index;
int red;
int green;
int blue;
} bc,tc,tn,go,gn;
static char *image,*comment;
static int skipcomment,list,verbose,output,debug;
static long int pos;
static char rgbtxt[] = RGBTXT, *rgb = rgbtxt;
static char true[] = "True";
static char false[] = "False";
#define readword(buffer) ((buffer)[0]+256*(buffer)[1])
#define readflag(buffer) ((buffer)?true:false)
#define hex(c) ('a'<=(c)&&(c)<='z'?(c)-'a'+10:'A'<=(c)&&(c)<='Z'?(c)-'A'+10:(c)-'0')
void dump(adr,data,len)
long int adr;
unsigned char *data;
size_t len;
{
int i;
while (len>0) {
(void)fprintf(stderr,"%08lx:%*s",adr,(int)((adr%16)*3+(adr%16>8?1:0)),"");
for (i=adr%16;i<16&&len>0;i++,adr++,data++,len--)
(void)fprintf(stderr,"%s%02x",i==8?" ":" ",*data);
(void)fprintf(stderr,"\n");
}
}
void writedata(dest,data,len)
FILE *dest;
unsigned char *data;
size_t len;
{
unsigned char size;
while (len) {
size=len<256?len:255;
(void)fwrite((void *)&size,1,1,dest);
(void)fwrite((void *)data,(size_t)size,1,dest);
data+=size;
len-=size;
}
size=0;
(void)fwrite((void *)&size,1,1,dest);
}
void skipdata(src)
FILE *src;
{
unsigned char size,buffer[256];
do {
pos=ftell(src);
(void)fread((void *)&size,1,1,src);
if (debug)
dump(pos,&size,1);
if (debug) {
pos=ftell(src);
(void)fread((void *)buffer,(size_t)size,1,src);
dump(pos,buffer,(size_t)size);
}
else
(void)fseek(src,(long int)size,SEEK_CUR);
} while (!feof(src)&&size>0);
}
void transblock(src,dest)
FILE *src;
FILE *dest;
{
unsigned char size,buffer[256];
pos=ftell(src);
(void)fread((void *)&size,1,1,src);
if (debug)
dump(pos,&size,1);
if (output)
(void)fwrite((void *)&size,1,1,dest);
pos=ftell(src);
(void)fread((void *)buffer,(size_t)size,1,src);
if (debug)
dump(pos,buffer,(size_t)size);
if (output)
(void)fwrite((void *)buffer,(size_t)size,1,dest);
}
void dumpcomment(src)
FILE *src;
{
unsigned char size,buffer[256];
size_t i;
pos=ftell(src);
(void)fread((void *)&size,1,1,src);
if (debug)
dump(pos,&size,1);
(void)fread((void *)buffer,(size_t)size,1,src);
if (debug)
dump(pos+1,buffer,(size_t)size);
for (i=0; i<(size_t)size; i++)
{
if (i%60==0)
(void)putc('\t',stderr);
if (isprint(buffer[i]))
(void)putc(buffer[i],stderr);
else
(void)fprintf(stderr,"\\%03o",buffer[i]);
if (i%60==59)
(void)putc('\n',stderr);
}
if (i%60)
(void)putc('\n',stderr);
(void)fseek(src,(long int)pos,SEEK_SET);
}
void transdata(src,dest)
FILE *src;
FILE *dest;
{
unsigned char size,buffer[256];
do {
pos=ftell(src);
(void)fread((void *)&size,1,1,src);
if (debug)
dump(pos,&size,1);
if (output)
(void)fwrite((void *)&size,1,1,dest);
pos=ftell(src);
(void)fread((void *)buffer,(size_t)size,1,src);
if (debug)
dump(pos,buffer,(size_t)size);
if (output)
(void)fwrite((void *)buffer,(size_t)size,1,dest);
} while (!feof(src)&&size>0);
}
int giftrans(src,dest)
FILE *src;
FILE *dest;
{
unsigned char buffer[3*256],lsd[7],gct[3*256],gce[5];
unsigned int cnt,cols,size,gct_size=0,gct_delay,gce_present;
struct entry *rgbptr;
/* Header */
pos=ftell(src);
(void)fread((void *)buffer,6,1,src);
if (strncmp((char *)buffer,"GIF",3)) {
(void)fprintf(stderr,"No GIF file!\n");
return(1);
}
if (verbose) {
buffer[6]='\0';
(void)fprintf(stderr,"Header: \"%s\"\n",buffer);
}
if (debug)
dump(pos,buffer,6);
if (output) {
if (!strncmp((char *)buffer,"GIF87a",6))
buffer[4]='9';
(void)fwrite((void *)buffer,6,1,dest);
}
/* Logical Screen Descriptor */
pos=ftell(src);
(void)fread((void *)lsd,7,1,src);
if (verbose) {
(void)fprintf(stderr,"Logical Screen Descriptor:\n");
(void)fprintf(stderr,"\tLogical Screen Width: %d pixels\n",readword(lsd));
(void)fprintf(stderr,"\tLogical Screen Height: %d pixels\n",readword(lsd+2));
(void)fprintf(stderr,"\tGlobal Color Table Flag: %s\n",readflag(lsd[4]&0x80));
(void)fprintf(stderr,"\tColor Resolution: %d bits\n",(lsd[4]&0x70>>4)+1);
if (lsd[4]&0x80) {
(void)fprintf(stderr,"\tSort Flag: %s\n",readflag(lsd[4]&0x8));
(void)fprintf(stderr,"\tSize of Global Color Table: %d colors\n",2<<(lsd[4]&0x7));
(void)fprintf(stderr,"\tBackground Color Index: %d\n",lsd[5]);
}
if (lsd[6])
(void)fprintf(stderr,"\tPixel Aspect Ratio: %d (Aspect Ratio %f)\n",lsd[6],((double)lsd[6]+15)/64);
}
if (debug)
dump(pos,lsd,7);
/* Global Color Table */
gct_delay=FALSE;
if (lsd[4]&0x80) {
gct_size=2<<(lsd[4]&0x7);
pos=ftell(src);
(void)fread((void *)gct,gct_size,3,src);
if (go.index==RGB)
for(cnt=0;cnt<gct_size&&go.index==RGB;cnt++)
if (gct[3*cnt]==go.red&&gct[3*cnt+1]==go.green&&gct[3*cnt+2]==go.blue)
go.index=cnt;
if (go.index>=0) {
if (gn.index>=0) {
gn.red=gct[3*gn.index];
gn.green=gct[3*gn.index+1];
gn.blue=gct[3*gn.index+2];
}
gct[3*go.index]=gn.red;
gct[3*go.index+1]=gn.green;
gct[3*go.index+2]=gn.blue;
}
if (bc.index==RGB)
for(cnt=0;cnt<gct_size&&bc.index==RGB;cnt++)
if (gct[3*cnt]==bc.red&&gct[3*cnt+1]==bc.green&&gct[3*cnt+2]==bc.blue)
bc.index=cnt;
if (bc.index>=0)
lsd[5]=bc.index;
if (tc.index==RGB)
for(cnt=0;cnt<gct_size&&tc.index==RGB;cnt++)
if (gct[3*cnt]==tc.red&&gct[3*cnt+1]==tc.green&&gct[3*cnt+2]==tc.blue)
tc.index=cnt;
if (tc.index==OTHER)
tc.index=lsd[5];
if (tn.index>=0) {
tn.red=gct[3*tn.index];
tn.green=gct[3*tn.index+1];
tn.blue=gct[3*tn.index+2];
}
if (tn.index!=NONE)
gct_delay=TRUE;
}
if (output)
(void)fwrite((void *)lsd,7,1,dest);
if (lsd[4]&0x80) {
if (list||verbose) {
(void)fprintf(stderr,"Global Color Table:\n");
for(cnt=0;cnt<gct_size;cnt++) {
(void)fprintf(stderr,"\tColor %d: Red %d, Green %d, Blue %d",cnt,gct[3*cnt],gct[3*cnt+1],gct[3*cnt+2]);
(void)fprintf(stderr,", #%02x%02x%02x",gct[3*cnt],gct[3*cnt+1],gct[3*cnt+2]);
for (rgbptr=root,cols=0;rgbptr;rgbptr=rgbptr->next)
if (rgbptr->red==gct[3*cnt]&&rgbptr->green==gct[3*cnt+1]&&rgbptr->blue==gct[3*cnt+2])
(void)fprintf(stderr,"%s%s",cols++?", ":" (",rgbptr->name);
(void)fprintf(stderr,"%s\n",cols?")":"");
}
}
if (debug)
dump(pos,gct,gct_size*3);
if (output&&(!gct_delay))
(void)fwrite((void *)gct,gct_size,3,dest);
}
gce_present=FALSE;
do {
pos=ftell(src);
(void)fread((void *)buffer,1,1,src);
switch (buffer[0]) {
case 0x2c: /* Image Descriptor */
if (verbose)
(void)fprintf(stderr,"Image Descriptor:\n");
(void)fread((void *)(buffer+1),9,1,src);
/* Write Graphic Control Extension */
if (tc.index>=0||gce_present) {
if (!gce_present) {
gce[0]=0;
gce[1]=0;
gce[2]=0;
}
if (tc.index>=0) {
gce[0]|=0x01; /* Set Transparent Color Flag */
gce[3]=tc.index; /* Set Transparent Color Index */
}
else if (gce[0]&0x01)
tc.index=gce[3]; /* Remember Transparent Color Index */
gce[4]=0;
if (tc.index>=0&&(!(buffer[8]&0x80))) { /* Transparent Color Flag set and no Local Color Table */
gct[3*tc.index]=tn.red;
gct[3*tc.index+1]=tn.green;
gct[3*tc.index+2]=tn.blue;
}
if (output&&gct_delay) {
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
if (output) {
(void)fputs("\041\371\004",dest);
(void)fwrite((void *)gce,5,1,dest);
}
}
if (output&&gct_delay) {
if (verbose)
(void)fprintf(stderr,"Warning: Global Color Table has not been modified as no Transparent Color Index has been set\n");
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
/* Write Image Descriptor */
if (verbose) {
(void)fprintf(stderr,"\tImage Left Position: %d pixels\n",readword(buffer+1));
(void)fprintf(stderr,"\tImage Top Position: %d pixels\n",readword(buffer+3));
(void)fprintf(stderr,"\tImage Width: %d pixels\n",readword(buffer+5));
(void)fprintf(stderr,"\tImage Height: %d pixels\n",readword(buffer+7));
(void)fprintf(stderr,"\tLocal Color Table Flag: %s\n",readflag(buffer[9]&0x80));
(void)fprintf(stderr,"\tInterlace Flag: %s\n",readflag(buffer[9]&0x40));
if (buffer[9]&0x80) {
(void)fprintf(stderr,"\tSort Flag: %s\n",readflag(buffer[9]&0x20));
(void)fprintf(stderr,"\tSize of Global Color Table: %d colors\n",2<<(buffer[9]&0x7));
}
}
if (debug)
dump(pos,buffer,10);
if (output)
(void)fwrite((void *)buffer,10,1,dest);
/* Local Color Table */
if (buffer[8]&0x80) {
size=2<<(buffer[8]&0x7);
pos=ftell(src);
(void)fread((void *)buffer,size,3,src);
if (verbose) {
(void)fprintf(stderr,"Local Color Table:\n");
for(cnt=0;cnt<size;cnt++)
(void)fprintf(stderr,"\tColor %d: Red %d, Green %d, Blue %d\n",cnt,buffer[3*cnt],buffer[3*cnt+1],buffer[3*cnt+2]);
}
if (tc.index>=0) { /* Transparent Color Flag set */
buffer[3*tc.index]=tn.red;
buffer[3*tc.index+1]=tn.green;
buffer[3*tc.index+2]=tn.blue;
}
if (debug)
dump(pos,buffer,size*3);
if (output)
(void)fwrite((void *)buffer,size,3,dest);
}
/* Table Based Image Data */
pos=ftell(src);
(void)fread((void *)buffer,1,1,src);
if (verbose) {
(void)fprintf(stderr,"Table Based Image Data:\n");
(void)fprintf(stderr,"\tLZW Minimum Code Size: 0x%02x\n",buffer[0]);
}
if (debug)
dump(pos,buffer,1);
if (output)
(void)fwrite((void *)buffer,1,1,dest);
transdata(src,dest);
gce_present=FALSE;
break;
case 0x3b: /* Trailer */
if (verbose)
(void)fprintf(stderr,"Trailer\n");
if (debug)
dump(pos,buffer,1);
if (comment&&*comment&&output) {
(void)fputs("\041\376",dest);
writedata(dest,(unsigned char *)comment,strlen(comment));
}
if (output)
(void)fwrite((void *)buffer,1,1,dest);
break;
case 0x21: /* Extension */
(void)fread((void *)(buffer+1),1,1,src);
switch (buffer[1]) {
case 0x01: /* Plain Text Extension */
if (output&&gct_delay) {
if (verbose)
(void)fprintf(stderr,"Warning: Global Color Table has not been modified due to a Plain Text Extension\n");
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
if (verbose)
(void)fprintf(stderr,"Plain Text Extension\n");
if (debug)
dump(pos,buffer,2);
if (output)
(void)fwrite((void *)buffer,2,1,dest);
transblock(src,dest);
transdata(src,dest);
break;
case 0xf9: /* Graphic Control Extension */
if (verbose)
(void)fprintf(stderr,"Graphic Control Extension:\n");
(void)fread((void *)(buffer+2),1,1,src);
size=buffer[2];
(void)fread((void *)gce,size,1,src);
if (verbose) {
(void)fprintf(stderr,"\tDisposal Method: %d ",gce[0]&0x1c>>2);
switch (gce[0]&0x1c>>2) {
case 0:
(void)fprintf(stderr,"(no disposal specified)\n");
break;
case 1:
(void)fprintf(stderr,"(do not dispose)\n");
break;
case 2:
(void)fprintf(stderr,"(restore to background color)\n");
break;
case 3:
(void)fprintf(stderr,"(restore to previous)\n");
break;
default:
(void)fprintf(stderr,"(to be defined)\n");
}
(void)fprintf(stderr,"\tUser Input Flag: %s\n",readflag(gce[0]&0x2));
(void)fprintf(stderr,"\tTransparent Color Flag: %s\n",readflag(gce[0]&0x1));
(void)fprintf(stderr,"\tDelay Time: %d\n",readword(gce+1));
if (gce[0]&0x1)
(void)fprintf(stderr,"\tTransparent Color Index: %d\n",gce[3]);
}
if (debug) {
dump(pos,buffer,3);
dump(pos+3,gce,size);
}
pos=ftell(src);
(void)fread((void *)buffer,1,1,src);
if (debug)
dump(pos,buffer,1);
gce_present=TRUE;
break;
case 0xfe: /* Comment Extension */
if (verbose)
{
(void)fprintf(stderr,"Comment Extension\n");
dumpcomment(src);
}
if (debug)
dump(pos,buffer,2);
if (skipcomment)
skipdata(src);
else {
if (output&&gct_delay) {
if (verbose)
(void)fprintf(stderr,"Warning: Global Color Table has not been modified due to a Comment Extension\n");
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
if (output)
(void)fwrite((void *)buffer,2,1,dest);
transdata(src,dest);
}
break;
case 0xff: /* Application Extension */
if (output&&gct_delay) {
if (verbose)
(void)fprintf(stderr,"Warning: Global Color Table has not been modified due to a Application Extension\n");
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
if (verbose)
(void)fprintf(stderr,"Application Extension\n");
if (debug)
dump(pos,buffer,2);
if (output)
(void)fwrite((void *)buffer,2,1,dest);
transblock(src,dest);
transdata(src,dest);
break;
default:
if (output&&gct_delay) {
if (verbose)
(void)fprintf(stderr,"Warning: Global Color Table has not been modified due to an unknown Extension\n");
(void)fwrite((void *)gct,gct_size,3,dest);
gct_delay=FALSE;
}
if (verbose)
(void)fprintf(stderr,"Unknown label: 0x%02x\n",buffer[1]);
if (debug)
dump(pos,buffer,2);
if (output)
(void)fwrite((void *)buffer,2,1,dest);
transblock(src,dest);
transdata(src,dest);
break;
}
break;
default:
(void)fprintf(stderr,"0x%08lx: Unknown extension 0x%02x!\n",ftell(src)-1,buffer[0]);
if (debug)
dump(pos,buffer,1);
return(1);
}
} while (buffer[0]!=0x3b&&!feof(src));
return(buffer[0]==0x3b?SUCCESS:FAILURE);
}
int getindex(c,arg)
struct color *c;
char *arg;
{
struct entry *ptr;
if ('0'<=*arg&&*arg<='9')
c->index=atoi(arg);
else if (*arg=='#') {
if (strlen(arg)==4) {
c->index=RGB;
c->red=hex(arg[1])<<4;
c->green=hex(arg[2])<<4;
c->blue=hex(arg[3])<<4;
}
else if (strlen(arg)==7) {
c->index=RGB;
c->red=(hex(arg[1])<<4)+hex(arg[2]);
c->green=(hex(arg[3])<<4)+hex(arg[4]);
c->blue=(hex(arg[5])<<4)+hex(arg[6]);
}
else {
(void)fprintf(stderr,"%s: illegal color specification: %s\n",image,arg);
return(FAILURE);
}
}
else {
for (ptr=root;ptr&&c->index!=RGB;ptr=ptr->next)
if (!strcmp(ptr->name,arg)) {
c->index=RGB;
c->red=ptr->red;
c->green=ptr->green;
c->blue=ptr->blue;
}
if (c->index!=RGB) {
(void)fprintf(stderr,"%s: no such color: %s\n",image,arg);
return(FAILURE);
}
}
return(SUCCESS);
}
void usage()
{
(void)fprintf(stderr,"Usage: %s [-t color|-T] [-B color] [-b color] [-g oldcolor=newcolor] [-c comment|-C] [-l|-L|-V] [-o filename] [-e filename] [filename]\n",image);
(void)fprintf(stderr,"Convert any GIF file into a GIF89a, with the folloing changes possible:\n");
(void)fprintf(stderr,"-t Specify the transparent color\n");
(void)fprintf(stderr,"-T Index of the transparent color is the background color index\n");
(void)fprintf(stderr,"-B Specify the transparent color's new value\n");
(void)fprintf(stderr,"-b Specify the background color\n");
(void)fprintf(stderr,"-g Change a color in the global color table\n");
(void)fprintf(stderr,"-c Add a comment\n");
(void)fprintf(stderr,"-C Remove old comment\n");
(void)fprintf(stderr,"-l Only list the color table\n");
(void)fprintf(stderr,"-L Verbose output of GIFs contents\n");
(void)fprintf(stderr,"-V Verbose output while converting\n");
(void)fprintf(stderr,"-o Redirect stdout to a file\n");
(void)fprintf(stderr,"-e Redirect stderr to a file\n");
if (*rgb)
(void)fprintf(stderr,"Colors may be specified as index, as rgb.txt entry or in the #rrggbb form.\n");
else
(void)fprintf(stderr,"Colors may be specified as index or in the #rrggbb form.\n");
exit(1);
}
int main(argc,argv)
int argc;
char *argv[];
{
int c;
extern char *optarg;
extern int optind;
char error[2*MAXPATHLEN+14],line[BUFSIZ],*ptr,*nptr,*oname,*ename;
struct entry **next;
FILE *src;
int stat;
#ifdef OS2
ptr=getenv("XFILES");
if (ptr) {
rgb=(char *)malloc(strlen(ptr)+strlen(rgbtxt)+2);
(void)strcpy(rgb,ptr);
(void)strcat(rgb,"\\");
(void)strcat(rgb,rgbtxt);
}
#endif /* OS2 */
image=argv[0];
root=NULL;
if (*rgb)
if ((src=fopen(rgb,"r"))!=NULL) {
next= &root;
while (fgets(line,sizeof(line),src)) {
*next=(struct entry *)malloc(sizeof(struct entry));
for (ptr=line;strchr(" \t",*ptr);ptr++);
for (nptr=ptr;!strchr(" \t",*ptr);ptr++);
*ptr++='\0';
(*next)->red=atoi(nptr);
for (;strchr(" \t",*ptr);ptr++);
for (nptr=ptr;!strchr(" \t",*ptr);ptr++);
*ptr++='\0';
(*next)->green=atoi(nptr);
for (;strchr(" \t",*ptr);ptr++);
for (nptr=ptr;!strchr(" \t",*ptr);ptr++);
*ptr++='\0';
(*next)->blue=atoi(nptr);
for (;strchr(" \t",*ptr);ptr++);
for (nptr=ptr;!strchr(" \t\r\n",*ptr);ptr++);
*ptr='\0';
(void)strcpy((*next)->name=(char *)malloc(strlen(nptr)+1),nptr);
(*next)->next=NULL;
next= &(*next)->next;
}
(void)fclose(src);
}
else {
#ifndef OS2_OR_MSDOS
(void)sprintf(error,"%s: cannot open %s",image,rgb);
perror(error);
return(FAILURE);
#else /* OS2_OR_MSDOS */
*rgb='\0';
#endif
}
bc.index=NONE;
tc.index=NONE;
tn.index=NONE;
go.index=NONE;
gn.index=NONE;
comment=NULL;
skipcomment=FALSE;
verbose=FALSE;
output=TRUE;
debug=FALSE;
oname=NULL;
ename=NULL;
while ((c=getopt(argc,argv,"t:TB:b:g:c:ClLVDo:e:vh?")) != EOF)
switch ((char)c) {
case 'b':
if (getindex(&bc,optarg))
return(FAILURE);
break;
case 't':
if (getindex(&tc,optarg))
return(FAILURE);
break;
case 'T':
tc.index=OTHER;
break;
case 'B':
if (getindex(&tn,optarg))
return(FAILURE);
break;
case 'g':
if ((ptr=strchr(optarg,'='))!=NULL) {
*ptr++='\0';
if (getindex(&go,optarg))
return(FAILURE);
if (getindex(&gn,ptr))
return(FAILURE);
}
else
usage();
break;
case 'c':
comment=optarg;
break;
case 'C':
skipcomment=TRUE;
break;
case 'l':
list=TRUE;
output=FALSE;
break;
case 'L':
verbose=TRUE;
output=FALSE;
break;
case 'V':
verbose=TRUE;
break;
case 'D':
debug=TRUE;
break;
case 'o':
oname=optarg;
break;
case 'e':
ename=optarg;
break;
case 'v':
(void)fprintf(stderr,"%s\n",sccsid+4);
(void)fprintf(stderr,"%s\n",copyright+4);
return(0);
case 'h':
(void)fprintf(stderr,"%s\n",sccsid+4);
(void)fprintf(stderr,"%s\n",copyright+4);
case '?':
usage();
}
if (optind+1<argc||(bc.index==NONE&&tc.index==NONE&&tn.index==NONE&&gn.index==NONE&&comment==NULL&&!skipcomment&&!list&&!verbose))
usage();
if (oname&&freopen(oname,"wb",stdout)==NULL) {
(void)sprintf(error,"%s: cannot open %s",image,oname);
perror(error);
return(FAILURE);
}
if (ename&&freopen(ename,"wb",stderr)==NULL) {
(void)sprintf(error,"%s: cannot open %s",image,ename);
perror(error);
return(FAILURE);
}
#ifdef OS2_OR_MSDOS
#ifdef MSDOS
if(oname==NULL&&(stdout->flags&_F_TERM)==0&&setmode(fileno(stdout),O_BINARY)!=0) {
#endif /* MSDOS */
#ifdef OS2
if(oname==NULL&&!freopen("", "wb", stdout)) {
#endif /* OS2 */
(void)fprintf(stderr,"%s: can't set stdout's mode to binary\n",image);
exit(2);
}
#ifdef MSDOS
if(optind==argc&&(stdin->flags&_F_TERM)==0&&setmode(fileno(stdin),O_BINARY)) {
#endif /* MSDOS */
#ifdef OS2
if(optind==argc&&!freopen("", "rb", stdin)) {
#endif /* OS2 */
(void)fprintf(stderr,"%s: can't set stdin's mode to binary\n",image);
exit(2);
}
#endif /* OS2_OR_MSDOS */
if (optind<argc)
if (strcmp(argv[optind],"-"))
if ((src=fopen(argv[optind],"rb"))!=NULL) {
stat=giftrans(src,stdout);
(void)fclose(src);
}
else {
(void)sprintf(error,"%s: cannot open %s",image,argv[optind]);
perror(error);
return(FAILURE);
}
else
stat=giftrans(stdin,stdout);
else
stat=giftrans(stdin,stdout);
(void)fclose(stdout);
(void)fclose(stderr);
return(stat);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.