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BizHawk/psx/mednadisc/cdrom/cdromif.cpp

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/* 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 <string.h>
#include <sys/types.h>
#include <algorithm>
#include "emuware/emuware.h"
#include "cdromif.h"
#include "CDAccess.h"
#include "general.h"
#include "error.h"
//undo gettext stuff
#define _(X) X
using namespace CDUtility;
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_0);
}
if(!ValidateRawSector(tmpbuf))
{
printf(_("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 = disc_cdaccess->Is_Physical();
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)
{
printf(_("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
{
if(eject_status != DiscEjected)
{
disc_cdaccess->Eject(eject_status);
// Set after ->Eject(), since it might throw an exception.
DiscEjected = -1; // For if TOC reading fails or there's something horribly wrong with the disc.
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));
}
}
DiscEjected = eject_status;
}
}
catch(std::exception &e)
{
printf("%s", e.what());
return(false);
}
return(true);
}
class CDIF_Stream_Thing : public Stream
{
public:
CDIF_Stream_Thing(CDIF *cdintf_arg, uint32 lba_arg, uint32 sector_count_arg);
~CDIF_Stream_Thing();
virtual uint64 attributes(void) override;
virtual uint64 read(void *data, uint64 count, bool error_on_eos = true) override;
virtual void write(const void *data, uint64 count) override;
virtual void truncate(uint64 length) override;
virtual void seek(int64 offset, int whence) override;
virtual uint64 tell(void) override;
virtual uint64 size(void) override;
virtual void flush(void) override;
virtual void close(void) override;
private:
CDIF *cdintf;
const uint32 start_lba;
const uint32 sector_count;
int64 position;
};
CDIF_Stream_Thing::CDIF_Stream_Thing(CDIF *cdintf_arg, uint32 start_lba_arg, uint32 sector_count_arg) : cdintf(cdintf_arg), start_lba(start_lba_arg), sector_count(sector_count_arg)
{
}
CDIF_Stream_Thing::~CDIF_Stream_Thing()
{
}
uint64 CDIF_Stream_Thing::attributes(void)
{
return(ATTRIBUTE_READABLE | ATTRIBUTE_SEEKABLE);
}
uint64 CDIF_Stream_Thing::read(void *data, uint64 count, bool error_on_eos)
{
if(count > (((uint64)sector_count * 2048) - position))
{
if(error_on_eos)
{
throw MDFN_Error(0, "EOF");
}
count = ((uint64)sector_count * 2048) - position;
}
if(!count)
return(0);
for(uint64 rp = position; rp < (position + count); rp = (rp &~ 2047) + 2048)
{
uint8 buf[2048];
if(!cdintf->ReadSector(buf, start_lba + (rp / 2048), 1))
{
throw MDFN_Error(ErrnoHolder(EIO));
}
//::printf("Meow: %08llx -- %08llx\n", count, (rp - position) + std::min<uint64>(2048 - (rp & 2047), count - (rp - position)));
memcpy((uint8*)data + (rp - position), buf + (rp & 2047), std::min<uint64>(2048 - (rp & 2047), count - (rp - position)));
}
position += count;
return count;
}
void CDIF_Stream_Thing::write(const void *data, uint64 count)
{
throw MDFN_Error(ErrnoHolder(EBADF));
}
void CDIF_Stream_Thing::truncate(uint64 length)
{
throw MDFN_Error(ErrnoHolder(EBADF));
}
void CDIF_Stream_Thing::seek(int64 offset, int whence)
{
int64 new_position;
switch(whence)
{
default:
throw MDFN_Error(ErrnoHolder(EINVAL));
break;
case SEEK_SET:
new_position = offset;
break;
case SEEK_CUR:
new_position = position + offset;
break;
case SEEK_END:
new_position = ((int64)sector_count * 2048) + offset;
break;
}
if(new_position < 0 || new_position > ((int64)sector_count * 2048))
throw MDFN_Error(ErrnoHolder(EINVAL));
position = new_position;
}
uint64 CDIF_Stream_Thing::tell(void)
{
return position;
}
uint64 CDIF_Stream_Thing::size(void)
{
return(sector_count * 2048);
}
void CDIF_Stream_Thing::flush(void)
{
}
void CDIF_Stream_Thing::close(void)
{
}
Stream *CDIF::MakeStream(uint32 lba, uint32 sector_count)
{
return new CDIF_Stream_Thing(this, lba, sector_count);
}
CDIF *CDIF_Open(const std::string& path, const bool is_device, bool image_memcache)
{
CDAccess *cda = cdaccess_open_image(path, image_memcache);
return new CDIF_ST(cda);
}
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