/* reloc65 -- A part of xa65 - 65xx/65816 cross-assembler and utility suite
 * Pack/Unpack cpk archive files
 *
 * Copyright (C) 1989-2002 André Fachat (a.fachat@physik.tu-chemnitz.de)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "version.h"

#define max(a, b)	(a > b) ? a : b
#define min(a, b)	(a < b) ? a : b

#define programname	"uncpk"
#define progversion	"v0.2.1"
#define author		"Written by André Fachat"
#define copyright	"Copyright (C) 1997-2002 André Fachat."

FILE *fp;
char name[100];
char *s;

void usage(FILE *fp)
{
	fprintf(fp,
		"Usage: %s [OPTION]... [FILE]...\n"
		"Manage c64 cpk archives\n"
		"\n"
		"  c             create an archive\n"
		"  a             add a file to an archive\n"
		"  x             extract archive\n"
		"  l             list contents of archive\n"
		"  v             verbose output\n"
		"     --version  output version information and exit\n"
		"     --help     display this help and exit\n",
		programname);
}

int list=0,verbose=0,add=0,create=0;

int main(int argc, char *argv[])
{
	int i,c,c2,fileok, nc;
	size_t n,n2;
	FILE *fp,*fpo=NULL;

	if (argc <= 1) {
	  usage(stderr);
	  exit(1);
	}

	if (strstr(argv[1], "--help")) {
          usage(stdout);
	  exit(0);
	}

	if (strstr(argv[1], "--version")) {
          version(programname, progversion, author, copyright);
	  exit(0);
	}

	if(strchr(argv[1],(int)'l')) {
	  list=1;
	}
	if(strchr(argv[1],(int)'v')) {
	  verbose=1;
	}
	if(strchr(argv[1],(int)'a')) {
	  add=1;
	}
	if(strchr(argv[1],(int)'c')) {
	  create=1;
	}

	if(add||create) {
	 if (argc <= 3) {
	   usage(stderr);
	   exit(1);
	 }
	 if(add) {
	   fpo=fopen(argv[2],"ab");
	 } else 
	 if(create) {
	   fpo=fopen(argv[2],"wb");
	 }
	 if(fpo) {
	   if(!add) fputc(1,fpo);		/* Version Byte */
	   for(i=3;i<argc;i++) {
	     if(verbose) printf("%s\n",argv[i]);
	     fp=fopen(argv[i],"rb");
	     if(fp) {
	       while((s=strchr(argv[i],':'))) *s='/';
	       fprintf(fpo,"%s",argv[i]);
	       fputc(0,fpo);
	       c=fgetc(fp);
	       while(c!=EOF) {
		 n=1;
	         while((c2=fgetc(fp))==c) {
		   n++;
		 }
		 while(n) {
		   if(n>=4 || c==0xf7) {
		     n2=min(255,n);
		     fprintf(fpo,"\xf7%c%c",(char)n2,(char)c);
		     n-=n2;
		   } else {
		     fputc(c,fpo);
		     n--;
		   }
		 }
		 c=c2; 
	       }
	       fclose(fp); 
	       fputc(0xf7,fpo); fputc(0,fpo);
	     } else {
	       fprintf(stderr,"Couldn't open file '%s' for reading!",argv[i]);
	     }
	   }
	   fclose(fpo);
	 } else {
	   fprintf(stderr,"Couldn't open file '%s' for writing!",argv[1]);
	 }
	} else {
	 if (argc != 3) {
	   usage(stderr);
	   exit(1);
	 }
	 fp=fopen(argv[2],"rb");
	 if(fp){
	  if(fgetc(fp)==1){
	    do{
	      /* read name */
	      i=0;
	      while((c=fgetc(fp))){
	        if(c==EOF) break;
	        name[i++]=c;
	      }
	      name[i++]='\0';
	      if(!c){	/* end of archive ? */
	        while((s=strchr(name,'/'))) *s=':';

	        if(verbose+list) printf("%s\n",name);

	        if(!list) { 
		  fpo=fopen(name,"wb");
	          if(!fpo) {
	 	    fprintf(stderr,"Couldn't open output file %s !\n",name);
	          }
	        }
		fileok=0;
	        while((c=fgetc(fp))!=EOF){
		  /* test if 'compressed' */
	          if(c==0xf7){
	            nc=fgetc(fp);
	            if(!nc) {
		      fileok=1;
	              break;
	            }
	            c=fgetc(fp);
	            if(fpo) {		/* extract */
	              if(nc!=EOF && c!=EOF) {
			nc &= 255;
	                while(nc--) {
	                  fputc(c,fpo);
	                }
	              }
		    }
	          } else {
	            if(fpo) {
	              fputc(c,fpo);
	            }
	          }
	        }
	        if(fpo) {
	          fclose(fpo);
	          fpo=NULL;
	        }
		if(!fileok) {
		  fprintf(stderr,"Unexpected end of file!\n");
		}
	      } 
   	    } while(c!=EOF);
	  } else
	    fprintf(stderr,"Wrong Version!\n");
	  fclose(fp);
	 } else {
	  fprintf(stderr,"File %s not found!\n",argv[1]);
	 } 
	}
	return(0);
}