pcsx2/plugins/CDVDlinuz/Src/convert.c

/*  convert.c

 *  Copyright (C) 2002-2005  PCSX2 Team

 *

 *  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

 *

 *  PCSX2 members can be contacted through their website at www.pcsx2.net.

 */





#include <stddef.h>

#include <sys/types.h>



#include "convert.h"





off64_t ConvertEndianOffset(off64_t number) {

#ifndef CONVERTLITTLEENDIAN

  union {

    off64_t n;

    char c[sizeof(off64_t)];

  } oldnumber, newnumber;

  int i;



  oldnumber.n = number;

  for(i = 0; i < sizeof(off64_t); i++)

    newnumber.c[i] = oldnumber.c[sizeof(off64_t) - 1 - i];

  return(newnumber.n);

#else

  return(number);

#endif /* CONVERTLITTLEENDIAN */

} // END ConvertEndianOffset()





unsigned int ConvertEndianUInt(unsigned int number) {

#ifndef CONVERTLITTLEENDIAN

  union {

    unsigned int n;

    char c[sizeof(unsigned int)];

  } oldnumber, newnumber;

  int i;



  oldnumber.n = number;

  for(i = 0; i < sizeof(unsigned int); i++)

    newnumber.c[i] = oldnumber.c[sizeof(unsigned int) - 1 - i];

  return(newnumber.n);

#else

  return(number);

#endif /* CONVERTLITTLEENDIAN */

} // END ConvertEndianUInt()





unsigned short ConvertEndianUShort(unsigned short number) {

#ifndef CONVERTLITTLEENDIAN

  union {

    unsigned short n;

    char c[sizeof(unsigned short)];

  } oldnumber, newnumber;

  int i;



  oldnumber.n = number;

  for(i = 0; i < sizeof(unsigned short); i++)

    newnumber.c[i] = oldnumber.c[sizeof(unsigned short) - 1 - i];

  return(newnumber.n);

#else

  return(number);

#endif /* CONVERTLITTLEENDIAN */

} // END ConvertEndianUShort()





// Note: deposits M/S/F data in buffer[0]/[1]/[2] respectively.

void LBAtoMSF(unsigned long lsn, char *buffer) {

  unsigned long templsn;



  if(lsn >= 0xFFFFFFFF - 150) {

    *(buffer + 2) = 75-1;

    *(buffer + 1) = 60-1;

    *(buffer) = 100-1;

  } // ENDIF- Out of range?



  templsn = lsn;

  templsn += 150; // 2 second offset (75 Frames * 2 Seconds)

  *(buffer + 2) = templsn % 75; // Remainder in frames

  templsn -= *(buffer + 2);

  templsn /= 75;

  *(buffer + 1) = templsn % 60; // Remainder in seconds

  templsn -= *(buffer + 1);

  templsn /= 60;

  *(buffer) = templsn; // Leftover quotient in minutes

} // END LBAtoMSF()





unsigned long MSFtoLBA(char *buffer) {

  unsigned long templsn;



  if(buffer == NULL)  return(0xFFFFFFFF);



  templsn = *(buffer); // Minutes

  templsn *= 60;

  templsn += *(buffer + 1); // Seconds

  templsn *= 75;

  templsn += *(buffer + 2); // Frames

  if(templsn < 150)  return(0xFFFFFFFF);

  templsn -= 150; // Offset



  return(templsn);

} // END MSFtoLBA()