mirror of
https://github.com/libretro/beetle-pce-fast-libretro.git
synced 2024-11-23 16:00:08 +00:00
861 lines
16 KiB
C++
861 lines
16 KiB
C++
/* Mednafen - Multi-system Emulator
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "../mednafen.h"
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#include <string.h>
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#include <sys/types.h>
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#include <trio/trio.h>
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#include "cdromif.h"
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#include "CDAccess.h"
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#include "../general.h"
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#include <algorithm>
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using namespace CDUtility;
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enum
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{
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// Status/Error messages
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CDIF_MSG_DONE = 0, // Read -> emu. args: No args.
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CDIF_MSG_INFO, // Read -> emu. args: str_message
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CDIF_MSG_FATAL_ERROR, // Read -> emu. args: *TODO ARGS*
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//
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// Command messages.
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//
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CDIF_MSG_DIEDIEDIE, // Emu -> read
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CDIF_MSG_READ_SECTOR, /* Emu -> read
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args[0] = lba
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*/
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CDIF_MSG_EJECT, // Emu -> read, args[0]; 0=insert, 1=eject
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};
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class CDIF_Message
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{
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public:
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CDIF_Message();
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CDIF_Message(unsigned int message_, uint32 arg0 = 0, uint32 arg1 = 0, uint32 arg2 = 0, uint32 arg3 = 0);
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CDIF_Message(unsigned int message_, const std::string &str);
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~CDIF_Message();
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unsigned int message;
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uint32 args[4];
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void *parg;
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std::string str_message;
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};
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class CDIF_Queue
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{
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public:
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CDIF_Queue();
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~CDIF_Queue();
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bool Read(CDIF_Message *message, bool blocking = TRUE);
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void Write(const CDIF_Message &message);
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private:
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std::queue<CDIF_Message> ze_queue;
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MDFN_Mutex *ze_mutex;
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};
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typedef struct
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{
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bool valid;
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bool error;
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uint32 lba;
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uint8 data[2352 + 96];
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} CDIF_Sector_Buffer;
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// TODO: prohibit copy constructor
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class CDIF_MT : public CDIF
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{
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public:
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CDIF_MT(CDAccess *cda);
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virtual ~CDIF_MT();
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virtual void HintReadSector(uint32 lba);
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virtual bool ReadRawSector(uint8 *buf, uint32 lba);
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// Return true if operation succeeded or it was a NOP(either due to not being implemented, or the current status matches eject_status).
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// Returns false on failure(usually drive error of some kind; not completely fatal, can try again).
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virtual bool Eject(bool eject_status);
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// FIXME: Semi-private:
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int ReadThreadStart(void);
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private:
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CDAccess *disc_cdaccess;
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MDFN_Thread *CDReadThread;
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// Queue for messages to the read thread.
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CDIF_Queue ReadThreadQueue;
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// Queue for messages to the emu thread.
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CDIF_Queue EmuThreadQueue;
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enum { SBSize = 256 };
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CDIF_Sector_Buffer SectorBuffers[SBSize];
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uint32 SBWritePos;
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MDFN_Mutex *SBMutex;
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//
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// Read-thread-only:
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//
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void RT_EjectDisc(bool eject_status, bool skip_actual_eject = false);
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uint32 ra_lba;
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int ra_count;
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uint32 last_read_lba;
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};
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// TODO: prohibit copy constructor
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class CDIF_ST : public CDIF
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{
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public:
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CDIF_ST(CDAccess *cda);
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virtual ~CDIF_ST();
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virtual void HintReadSector(uint32 lba);
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virtual bool ReadRawSector(uint8 *buf, uint32 lba);
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virtual bool Eject(bool eject_status);
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private:
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CDAccess *disc_cdaccess;
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};
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CDIF::CDIF() : UnrecoverableError(false), is_phys_cache(false), DiscEjected(false)
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{
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}
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CDIF::~CDIF()
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{
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}
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CDIF_Message::CDIF_Message()
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{
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message = 0;
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memset(args, 0, sizeof(args));
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}
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CDIF_Message::CDIF_Message(unsigned int message_, uint32 arg0, uint32 arg1, uint32 arg2, uint32 arg3)
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{
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message = message_;
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args[0] = arg0;
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args[1] = arg1;
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args[2] = arg2;
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args[3] = arg3;
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}
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CDIF_Message::CDIF_Message(unsigned int message_, const std::string &str)
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{
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message = message_;
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str_message = str;
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}
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CDIF_Message::~CDIF_Message()
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{
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}
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CDIF_Queue::CDIF_Queue()
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{
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ze_mutex = MDFND_CreateMutex();
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}
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CDIF_Queue::~CDIF_Queue()
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{
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MDFND_DestroyMutex(ze_mutex);
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}
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// Returns FALSE if message not read, TRUE if it was read. Will always return TRUE if "blocking" is set.
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// Will throw MDFN_Error if the read message code is CDIF_MSG_FATAL_ERROR
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bool CDIF_Queue::Read(CDIF_Message *message, bool blocking)
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{
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TryAgain:
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MDFND_LockMutex(ze_mutex);
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if(ze_queue.size() > 0)
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{
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*message = ze_queue.front();
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ze_queue.pop();
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MDFND_UnlockMutex(ze_mutex);
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if(message->message == CDIF_MSG_FATAL_ERROR)
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throw MDFN_Error(0, "%s", message->str_message.c_str());
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return(TRUE);
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}
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else if(blocking)
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{
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MDFND_UnlockMutex(ze_mutex);
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MDFND_Sleep(1);
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goto TryAgain;
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}
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else
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{
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MDFND_UnlockMutex(ze_mutex);
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return(FALSE);
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}
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}
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void CDIF_Queue::Write(const CDIF_Message &message)
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{
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MDFND_LockMutex(ze_mutex);
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ze_queue.push(message);
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MDFND_UnlockMutex(ze_mutex);
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}
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void CDIF_MT::RT_EjectDisc(bool eject_status, bool skip_actual_eject)
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{
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int32 old_de = DiscEjected;
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DiscEjected = eject_status;
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if(old_de != DiscEjected)
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{
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if(!skip_actual_eject)
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disc_cdaccess->Eject(eject_status);
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if(!eject_status) // Re-read the TOC
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{
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disc_cdaccess->Read_TOC(&disc_toc);
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if(disc_toc.first_track < 1 || disc_toc.last_track > 99 || disc_toc.first_track > disc_toc.last_track)
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{
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throw(MDFN_Error(0, _("TOC first(%d)/last(%d) track numbers bad."), disc_toc.first_track, disc_toc.last_track));
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}
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}
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SBWritePos = 0;
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ra_lba = 0;
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ra_count = 0;
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last_read_lba = ~0U;
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memset(SectorBuffers, 0, SBSize * sizeof(CDIF_Sector_Buffer));
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}
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}
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struct RTS_Args
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{
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CDIF_MT *cdif_ptr;
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};
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static int ReadThreadStart_C(void *v_arg)
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{
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RTS_Args *args = (RTS_Args *)v_arg;
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return args->cdif_ptr->ReadThreadStart();
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}
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int CDIF_MT::ReadThreadStart()
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{
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bool Running = TRUE;
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DiscEjected = true;
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SBWritePos = 0;
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ra_lba = 0;
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ra_count = 0;
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last_read_lba = ~0U;
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try
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{
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RT_EjectDisc(false, true);
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}
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catch(std::exception &e)
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{
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EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_FATAL_ERROR, std::string(e.what())));
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return(0);
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}
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is_phys_cache = disc_cdaccess->Is_Physical();
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EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_DONE));
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while(Running)
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{
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CDIF_Message msg;
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// Only do a blocking-wait for a message if we don't have any sectors to read-ahead.
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// MDFN_DispMessage("%d %d %d\n", last_read_lba, ra_lba, ra_count);
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if(ReadThreadQueue.Read(&msg, ra_count ? FALSE : TRUE))
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{
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switch(msg.message)
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{
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case CDIF_MSG_DIEDIEDIE:
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Running = FALSE;
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break;
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case CDIF_MSG_EJECT:
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try
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{
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RT_EjectDisc(msg.args[0]);
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EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_DONE));
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}
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catch(std::exception &e)
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{
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EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_FATAL_ERROR, std::string(e.what())));
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}
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break;
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case CDIF_MSG_READ_SECTOR:
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{
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static const int max_ra = 16;
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static const int initial_ra = 1;
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static const int speedmult_ra = 2;
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uint32 new_lba = msg.args[0];
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assert((unsigned int)max_ra < (SBSize / 4));
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if(last_read_lba != ~0U && new_lba == (last_read_lba + 1))
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{
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int how_far_ahead = ra_lba - new_lba;
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if(how_far_ahead <= max_ra)
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ra_count = std::min(speedmult_ra, 1 + max_ra - how_far_ahead);
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else
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ra_count++;
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}
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else if(new_lba != last_read_lba)
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{
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ra_lba = new_lba;
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ra_count = initial_ra;
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}
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last_read_lba = new_lba;
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}
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break;
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}
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}
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// Don't read >= the "end" of the disc, silly snake. Slither.
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if(ra_count && ra_lba == disc_toc.tracks[100].lba)
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{
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ra_count = 0;
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//printf("Ephemeral scarabs: %d!\n", ra_lba);
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}
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if(ra_count)
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{
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uint8 tmpbuf[2352 + 96];
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bool error_condition = false;
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try
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{
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disc_cdaccess->Read_Raw_Sector(tmpbuf, ra_lba);
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}
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catch(std::exception &e)
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{
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MDFN_PrintError(_("Sector %u read error: %s"), ra_lba, e.what());
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memset(tmpbuf, 0, sizeof(tmpbuf));
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error_condition = true;
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}
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MDFND_LockMutex(SBMutex);
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SectorBuffers[SBWritePos].lba = ra_lba;
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memcpy(SectorBuffers[SBWritePos].data, tmpbuf, 2352 + 96);
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SectorBuffers[SBWritePos].valid = TRUE;
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SectorBuffers[SBWritePos].error = error_condition;
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SBWritePos = (SBWritePos + 1) % SBSize;
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MDFND_UnlockMutex(SBMutex);
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ra_lba++;
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ra_count--;
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}
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}
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return(1);
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}
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CDIF_MT::CDIF_MT(CDAccess *cda) : disc_cdaccess(cda), CDReadThread(NULL), SBMutex(NULL)
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{
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try
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{
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CDIF_Message msg;
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RTS_Args s;
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SBMutex = MDFND_CreateMutex();
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UnrecoverableError = false;
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s.cdif_ptr = this;
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CDReadThread = MDFND_CreateThread(ReadThreadStart_C, &s);
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EmuThreadQueue.Read(&msg);
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}
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catch(...)
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{
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if(CDReadThread)
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{
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MDFND_WaitThread(CDReadThread, NULL);
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CDReadThread = NULL;
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}
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if(SBMutex)
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{
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MDFND_DestroyMutex(SBMutex);
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SBMutex = NULL;
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}
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if(disc_cdaccess)
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{
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delete disc_cdaccess;
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disc_cdaccess = NULL;
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}
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throw;
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}
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}
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CDIF_MT::~CDIF_MT()
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{
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bool thread_deaded_failed = false;
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try
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{
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ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_DIEDIEDIE));
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}
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catch(std::exception &e)
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{
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MDFND_PrintError(e.what());
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thread_deaded_failed = true;
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}
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if(!thread_deaded_failed)
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MDFND_WaitThread(CDReadThread, NULL);
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if(SBMutex)
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{
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MDFND_DestroyMutex(SBMutex);
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SBMutex = NULL;
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}
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if(disc_cdaccess)
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{
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delete disc_cdaccess;
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disc_cdaccess = NULL;
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}
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}
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bool CDIF::ValidateRawSector(uint8 *buf)
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{
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int mode = buf[12 + 3];
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if(mode != 0x1 && mode != 0x2)
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return(false);
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if(!edc_lec_check_and_correct(buf, mode == 2))
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return(false);
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return(true);
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}
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bool CDIF_MT::ReadRawSector(uint8 *buf, uint32 lba)
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{
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bool found = FALSE;
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bool error_condition = false;
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if(UnrecoverableError)
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{
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memset(buf, 0, 2352 + 96);
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return(false);
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}
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// This shouldn't happen, the emulated-system-specific CDROM emulation code should make sure the emulated program doesn't try
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// to read past the last "real" sector of the disc.
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if(lba >= disc_toc.tracks[100].lba)
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{
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printf("Attempt to read LBA %d, >= LBA %d\n", lba, disc_toc.tracks[100].lba);
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return(FALSE);
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}
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ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba));
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do
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{
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MDFND_LockMutex(SBMutex);
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for(int i = 0; i < SBSize; i++)
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{
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if(SectorBuffers[i].valid && SectorBuffers[i].lba == lba)
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{
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error_condition = SectorBuffers[i].error;
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memcpy(buf, SectorBuffers[i].data, 2352 + 96);
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found = TRUE;
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}
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}
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MDFND_UnlockMutex(SBMutex);
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if(!found)
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MDFND_Sleep(1);
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} while(!found);
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return(!error_condition);
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}
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void CDIF_MT::HintReadSector(uint32 lba)
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{
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if(UnrecoverableError)
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return;
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ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba));
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}
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int CDIF::ReadSector(uint8* pBuf, uint32 lba, uint32 nSectors)
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{
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int ret = 0;
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if(UnrecoverableError)
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return(false);
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while(nSectors--)
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{
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uint8 tmpbuf[2352 + 96];
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if(!ReadRawSector(tmpbuf, lba))
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{
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puts("CDIF Raw Read error");
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return(FALSE);
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}
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if(!ValidateRawSector(tmpbuf))
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{
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MDFN_DispMessage(_("Uncorrectable data at sector %d"), lba);
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MDFN_PrintError(_("Uncorrectable data at sector %d"), lba);
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return(false);
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}
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const int mode = tmpbuf[12 + 3];
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if(!ret)
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ret = mode;
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if(mode == 1)
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{
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memcpy(pBuf, &tmpbuf[12 + 4], 2048);
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}
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else if(mode == 2)
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{
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memcpy(pBuf, &tmpbuf[12 + 4 + 8], 2048);
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}
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else
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{
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printf("CDIF_ReadSector() invalid sector type at LBA=%u\n", (unsigned int)lba);
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return(false);
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}
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pBuf += 2048;
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lba++;
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}
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return(ret);
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}
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|
bool CDIF_MT::Eject(bool eject_status)
|
|
{
|
|
if(UnrecoverableError)
|
|
return(false);
|
|
|
|
try
|
|
{
|
|
CDIF_Message msg;
|
|
|
|
ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_EJECT, eject_status));
|
|
EmuThreadQueue.Read(&msg);
|
|
}
|
|
catch(std::exception &e)
|
|
{
|
|
MDFN_PrintError(_("Error on eject/insert attempt: %s"), e.what());
|
|
return(false);
|
|
}
|
|
|
|
return(true);
|
|
}
|
|
|
|
//
|
|
//
|
|
// 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)
|
|
{
|
|
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);
|
|
}
|
|
|
|
|
|
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);
|
|
virtual uint8 *map(void);
|
|
virtual void unmap(void);
|
|
|
|
virtual uint64 read(void *data, uint64 count, bool error_on_eos = true);
|
|
virtual void write(const void *data, uint64 count);
|
|
|
|
virtual void seek(int64 offset, int whence);
|
|
virtual int64 tell(void);
|
|
virtual int64 size(void);
|
|
virtual void close(void);
|
|
|
|
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);
|
|
}
|
|
|
|
uint8 *CDIF_Stream_Thing::map(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void CDIF_Stream_Thing::unmap(void)
|
|
{
|
|
|
|
}
|
|
|
|
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::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;
|
|
}
|
|
|
|
int64 CDIF_Stream_Thing::tell(void)
|
|
{
|
|
return position;
|
|
}
|
|
|
|
int64 CDIF_Stream_Thing::size(void)
|
|
{
|
|
return(sector_count * 2048);
|
|
}
|
|
|
|
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 char *path, const bool is_device, bool image_memcache)
|
|
{
|
|
if(is_device)
|
|
return new CDIF_MT(cdaccess_open_phys(path));
|
|
else
|
|
{
|
|
CDAccess *cda = cdaccess_open_image(path, image_memcache);
|
|
|
|
if(!image_memcache)
|
|
return new CDIF_MT(cda);
|
|
else
|
|
return new CDIF_ST(cda);
|
|
}
|
|
}
|