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config.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * 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.
 *fs
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/****************************************************************/
/*                FCE Ultra                     */
/*                                              */
/*    This file contains routines for reading/writing the     */
/*    configuration file.                             */
/*                                              */
/****************************************************************/

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

#include "../../types.h"
#include "../../driver.h"
#include "../../utils/xstring.h"
#include "config.h"

static int FReadString(FILE *fp, char *str, int n)
{
 int x=0,z;
 for(;;)
 {
  z=fgetc(fp);
  str[x]=z;
  x++;  
  if(z<=0) break;
  if(x>=n) return 0;
 }
 if(z<0) return 0;
 return 1;
}

#include <map>
#include <string>
typedef std::map<std::string,std::string> CFGMAP;
static CFGMAP cfgmap;

static void cfg_Parse(FILE *fp)
{
      //yes... it is a homebrewed key-value-pair parser
      std::string key,value;
      enum {
            NEWLINE, KEY, SEPARATOR, VALUE, COMMENT
      } state = NEWLINE;
      bool bail = false;
      for(;;)
      {
            int c = fgetc(fp);
            bool iswhitespace, iscommentchar, isnewline;
            if(c == -1)
                  goto bail;
            iswhitespace = (c==' '||c=='\t');
            iscommentchar = (c=='#');
            isnewline = (c==10||c==13);
            switch(state)
            {
            case NEWLINE:
                  if(iswhitespace) goto done;
                  if(iscommentchar) goto docomment;
                  if(isnewline) goto done;
                  key = "";
                  value = "";
                  goto dokey; 
                  break;
            case COMMENT:
                  docomment:
                  state = COMMENT;
                  if(isnewline) state = NEWLINE;
                  break;
            case KEY:
                  dokey: //dookie
                  state = KEY;
                  if(iswhitespace) goto doseparator;
                  if(isnewline) goto commit;
                  key += c;
                  break;
            case SEPARATOR:
                  doseparator:
                  state = SEPARATOR;
                  if(isnewline) goto commit;
                  if(!iswhitespace) goto dovalue;
                  break;
            case VALUE:
                  dovalue:
                  state = VALUE;
                  if(isnewline) goto commit;
                  value += c;
            }
            goto done;

            bail:
            bail = true;
            if(state == VALUE) goto commit;
            commit:
            cfgmap[key] = value;
            state = NEWLINE;
            if(bail) break;
            done: ;
      }
}

static void cfg_Save(FILE *fp)
{
      for(CFGMAP::iterator it(cfgmap.begin()); it != cfgmap.end(); it++)
      {
            if(it->first.size()>30 || it->second.size()>30)
            {
                  int zzz=9;
            }
            fprintf(fp,"%s %s\n",it->first.c_str(),it->second.c_str());
      }
}


static void GetValueR(FILE *fp, char *str, void *v, int c)
{
      char buf[256];
      int s;

      while(FReadString(fp,buf,256))
      {
            fread(&s,1,4,fp);

            if(!strcmp(str, buf))
            {
                  if(!c)      // String, allocate some memory.
                  {
                        if(!(*(char **)v=(char*)malloc(s)))
                              goto gogl;
                        
                        fread(*(char **)v,1,s,fp);
                        continue;
                  }
                  else if(s>c || s<c)
                  {
                        gogl:
                        fseek(fp,s,SEEK_CUR);
                        continue;
                  }
            
                  fread((uint8*)v,1,c,fp);
            }
            else
            {
                  fseek(fp,s,SEEK_CUR);
            }
      }

      fseek(fp,4,SEEK_SET);
}

void SetValueR(FILE *fp, const char *str, void *v, int c)
{
      fwrite(str,1,strlen(str)+1,fp);
      fwrite((uint8*)&c,1,4,fp);
      fwrite((uint8*)v,1,c,fp);
}

/**
* Parses a c onfiguration structure and saves information from the structure into a file.
*
* @param cfgst The configuration structure.
* @param fp File handle.
**/
void SaveParse(const CFGSTRUCT *cfgst, FILE *fp)
{
      int x=0;

      while(cfgst[x].ptr)
      {

            //structure contains another embedded structure.
            //recurse.
            if(!cfgst[x].name) {
                  SaveParse((CFGSTRUCT*)cfgst[x].ptr, fp);
                  x++;
                  continue;
            }

            if(cfgst[x].len)
            {
                  // Plain data
                  SetValueR(fp,cfgst[x].name,cfgst[x].ptr,cfgst[x].len);
            }
            else
            {
                  // String
                  if(*(char **)cfgst[x].ptr)
                  {
                        // Only save it if there IS a string.
                        unsigned int len = strlen(*(char **)cfgst[x].ptr);
                        SetValueR(fp,cfgst[x].name,*(char **)cfgst[x].ptr, len + 1);
                  }
            }

            x++;
      }
}

/**
* Parses information from a file into a configuration structure.
*
* @param cfgst The configuration structure.
* @param fp File handle.
**/
void LoadParse(CFGSTRUCT *cfgst, FILE *fp)
{
      int x = 0;

      while(cfgst[x].ptr)
      {
            if(!cfgst[x].name)     // Link to new config structure
            {
                  LoadParse((CFGSTRUCT*)cfgst[x].ptr, fp);
                  x++;
                  continue;
            }

            GetValueR(fp, cfgst[x].name, cfgst[x].ptr, cfgst[x].len);
            x++;
      } 
}


static void cfg_OldToNew(const CFGSTRUCT *cfgst)
{
      int x=0;

      while(cfgst[x].ptr)
      {
            //structure contains another embedded structure. recurse.
            if(!cfgst[x].name) {
                  cfg_OldToNew((CFGSTRUCT*)cfgst[x].ptr);
                  x++;
                  continue;
            }

            if(cfgst[x].len)
            {
                  //binary data
                  cfgmap[cfgst[x].name] = BytesToString(cfgst[x].ptr,cfgst[x].len);
            }
            else
            {
                  //string data
                  if(*(char*)cfgst[x].ptr)
                        cfgmap[cfgst[x].name] = *(char**)cfgst[x].ptr;
                  else cfgmap[cfgst[x].name] = "";
            }

            x++;
      }
}

void cfg_NewToOld(CFGSTRUCT *cfgst)
{
      int x=0;

      while(cfgst[x].ptr)
      {
            //structure contains another embedded structure. recurse.
            if(!cfgst[x].name) {
                  cfg_NewToOld((CFGSTRUCT*)cfgst[x].ptr);
                  x++;
                  continue;
            }

            //if the key was not found, skip it
            if(cfgmap.find(std::string(cfgst[x].name)) == cfgmap.end())
            {
                  x++;
                  continue;
            }

            if(cfgst[x].len)
            {
                  //binary data
                  if(!StringToBytes(cfgmap[cfgst[x].name],cfgst[x].ptr,cfgst[x].len))
                        FCEUD_PrintError("Config error: error parsing parameter");
            }
            else
            {
                  //string data
                  if(*(char*)cfgst[x].ptr)
                        free(cfgst[x].ptr);
                  std::string& str = cfgmap[cfgst[x].name];
                  if(str == "")
                        *(char**)cfgst[x].ptr = 0;
                  else
                        *(char**)cfgst[x].ptr = strdup(cfgmap[cfgst[x].name].c_str());
            }

            x++;
      }
}

//saves the old fceu98 format
void SaveFCEUConfig_old(const char *filename, const CFGSTRUCT *cfgst)
{
      FILE *fp = fopen(filename,"wb");

      if(fp==NULL)
      {
            return;
      }

      SaveParse(cfgst, fp);

      fclose(fp);
}

void SaveFCEUConfig(const char *filename, const CFGSTRUCT *cfgst)
{
      FILE *fp = fopen(filename,"wb");

      if(fp==NULL)
            return;
      fclose(fp);       //adelikat:  Adding this so it will let go of the file handle without having to close the emulator!
      fp = fopen(filename,"wb");
      cfg_OldToNew(cfgst);
      cfg_Save(fp);
      fclose(fp);
}

//loads the old fceu98 format
void LoadFCEUConfig_old(const char *filename, CFGSTRUCT *cfgst)
{
      FILE *fp = fopen(filename,"rb");

      if(fp==NULL)
            return;

      LoadParse(cfgst,fp);

      fclose(fp);
}

void LoadFCEUConfig(const char *filename, CFGSTRUCT *cfgst)
{
      FILE *fp = fopen(filename,"rb");

      cfgmap.clear();

      //make sure there is a version key set
      cfgmap["!version"] = "1";

      if(fp==NULL)
            return;

      cfg_Parse(fp);
      cfg_NewToOld(cfgst);

      fclose(fp);
}

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