mednafen/cdrom/cdromif.cpp

/* Mednafen - Multi-system Emulator
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "../mednafen.h"
#include <string.h>
#include <sys/types.h>
#include "cdromif.h"
#include "CDAccess.h"
#include "../general.h"

#include <algorithm>

enum
{
 // Status/Error messages
 CDIF_MSG_DONE = 0,		// Read -> emu. args: No args.
 CDIF_MSG_INFO,			// Read -> emu. args: str_message
 CDIF_MSG_FATAL_ERROR,		// Read -> emu. args: *TODO ARGS*

 //
 // Command messages.
 //
 CDIF_MSG_DIEDIEDIE,		// Emu -> read

 CDIF_MSG_READ_SECTOR,		/* Emu -> read
					args[0] = lba
				*/

 CDIF_MSG_EJECT,		// Emu -> read, args[0]; 0=insert, 1=eject
};

class CDIF_Message
{
 public:

 CDIF_Message();
 CDIF_Message(unsigned int message_, uint32 arg0 = 0, uint32 arg1 = 0, uint32 arg2 = 0, uint32 arg3 = 0);
 CDIF_Message(unsigned int message_, const std::string &str);
 ~CDIF_Message();

 unsigned int message;
 uint32 args[4];
 void *parg;
 std::string str_message;
};

typedef struct
{
 bool valid;
 bool error;
 uint32 lba;
 uint8 data[2352 + 96];
} CDIF_Sector_Buffer;

// TODO: prohibit copy constructor
class CDIF_ST : public CDIF
{
 public:

 CDIF_ST(CDAccess *cda);
 virtual ~CDIF_ST();

 virtual void HintReadSector(uint32 lba);
 virtual bool ReadRawSector(uint8 *buf, uint32 lba);
 virtual bool Eject(bool eject_status);

 private:
 CDAccess *disc_cdaccess;
};

CDIF::CDIF() : UnrecoverableError(false), is_phys_cache(false), DiscEjected(false)
{

}

CDIF::~CDIF()
{

}


CDIF_Message::CDIF_Message()
{
 message = 0;

 memset(args, 0, sizeof(args));
}

CDIF_Message::CDIF_Message(unsigned int message_, uint32 arg0, uint32 arg1, uint32 arg2, uint32 arg3)
{
 message = message_;
 args[0] = arg0;
 args[1] = arg1;
 args[2] = arg2;
 args[3] = arg3;
}

CDIF_Message::CDIF_Message(unsigned int message_, const std::string &str)
{
 message = message_;
 str_message = str;
}

CDIF_Message::~CDIF_Message()
{

}

bool CDIF::ValidateRawSector(uint8 *buf)
{
 int mode = buf[12 + 3];

 if(mode != 0x1 && mode != 0x2)
  return(false);

 if(!edc_lec_check_and_correct(buf, mode == 2))
  return(false);

 return(true);
}

int CDIF::ReadSector(uint8* pBuf, uint32 lba, uint32 nSectors)
{
 int ret = 0;

 if(UnrecoverableError)
  return(false);

 while(nSectors--)
 {
  uint8 tmpbuf[2352 + 96];

  if(!ReadRawSector(tmpbuf, lba))
  {
   puts("CDIF Raw Read error");
   return(FALSE);
  }

  if(!ValidateRawSector(tmpbuf))
  {
   MDFN_DispMessage(_("Uncorrectable data at sector %d"), lba);
   MDFN_PrintError(_("Uncorrectable data at sector %d"), lba);
   return(false);
  }

  const int mode = tmpbuf[12 + 3];

  if(!ret)
   ret = mode;

  if(mode == 1)
  {
   memcpy(pBuf, &tmpbuf[12 + 4], 2048);
  }
  else if(mode == 2)
  {
   memcpy(pBuf, &tmpbuf[12 + 4 + 8], 2048);
  }
  else
  {
   printf("CDIF_ReadSector() invalid sector type at LBA=%u\n", (unsigned int)lba);
   return(false);
  }

  pBuf += 2048;
  lba++;
 }

 return(ret);
}

// Single-threaded implementation follows.

CDIF_ST::CDIF_ST(CDAccess *cda) : disc_cdaccess(cda)
{
 //puts("***WARNING USING SINGLE-THREADED CD READER***");

 is_phys_cache = false;
 UnrecoverableError = false;
 DiscEjected = false;

 disc_cdaccess->Read_TOC(&disc_toc);

 if(disc_toc.first_track < 1 || disc_toc.last_track > 99 || disc_toc.first_track > disc_toc.last_track)
 {
  throw(MDFN_Error(0, _("TOC first(%d)/last(%d) track numbers bad."), disc_toc.first_track, disc_toc.last_track));
 }
}

CDIF_ST::~CDIF_ST()
{
 if(disc_cdaccess)
 {
  delete disc_cdaccess;
  disc_cdaccess = NULL;
 }
}

void CDIF_ST::HintReadSector(uint32 lba)
{
 // TODO: disc_cdaccess seek hint? (probably not, would require asynchronousitycamel)
}

bool CDIF_ST::ReadRawSector(uint8 *buf, uint32 lba)
{
 if(UnrecoverableError)
 {
  memset(buf, 0, 2352 + 96);
  return(false);
 }

 try
 {
  disc_cdaccess->Read_Raw_Sector(buf, lba);
 }
 catch(std::exception &e)
 {
  MDFN_PrintError(_("Sector %u read error: %s"), lba, e.what());
  memset(buf, 0, 2352 + 96);
  return(false);
 }

 return(true);
}

bool CDIF_ST::Eject(bool eject_status)
{
 if(UnrecoverableError)
  return(false);

 try
 {
  int32 old_de = DiscEjected;

  DiscEjected = eject_status;

  if(old_de != DiscEjected)
  {
   disc_cdaccess->Eject(eject_status);

   if(!eject_status)     // Re-read the TOC
   {
    disc_cdaccess->Read_TOC(&disc_toc);

    if(disc_toc.first_track < 1 || disc_toc.last_track > 99 || disc_toc.first_track > disc_toc.last_track)
    {
     throw(MDFN_Error(0, _("TOC first(%d)/last(%d) track numbers bad."), disc_toc.first_track, disc_toc.last_track));
    }
   }
  }
 }
 catch(std::exception &e)
 {
  MDFN_PrintError("%s", e.what());
  return(false);
 }

 return(true);
}

CDIF *CDIF_Open(const char *path, const bool is_device, bool image_memcache)
{
   CDAccess *cda = cdaccess_open_image(path, image_memcache);

   return new CDIF_ST(cda);
}