pcsx2/plugins/CDVDlinuz/Src/convert.c

237 lines
3.5 KiB
C
Raw Normal View History

/* 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()