[pcsx_rearmed.git] / libpcsxcore / sio.c

/***************************************************************************
 *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX 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.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
 ***************************************************************************/

/*
* SIO functions.
*/

#include "sio.h"
#include <sys/stat.h>

#ifdef USE_LIBRETRO_VFS
#include <streams/file_stream_transforms.h>
#endif

// Status Flags
#define TX_RDY		0x0001
#define RX_RDY		0x0002
#define TX_EMPTY	0x0004
#define PARITY_ERR	0x0008
#define RX_OVERRUN	0x0010
#define FRAMING_ERR	0x0020
#define SYNC_DETECT	0x0040
#define DSR			0x0080
#define CTS			0x0100
#define IRQ			0x0200

// Control Flags
#define TX_PERM		0x0001
#define DTR			0x0002
#define RX_PERM		0x0004
#define BREAK		0x0008
#define RESET_ERR	0x0010
#define RTS			0x0020
#define SIO_RESET	0x0040

// *** FOR WORKS ON PADS AND MEMORY CARDS *****

static unsigned char buf[256];
static unsigned char cardh1[4] = { 0xff, 0x08, 0x5a, 0x5d };
static unsigned char cardh2[4] = { 0xff, 0x08, 0x5a, 0x5d };

// Transfer Ready and the Buffer is Empty
// static unsigned short StatReg = 0x002b;
static unsigned short StatReg = TX_RDY | TX_EMPTY;
static unsigned short ModeReg;
static unsigned short CtrlReg;
static unsigned short BaudReg;

static unsigned int bufcount;
static unsigned int parp;
static unsigned int mcdst, rdwr;
static unsigned char adrH, adrL;
static unsigned int padst;

char Mcd1Data[MCD_SIZE], Mcd2Data[MCD_SIZE];
char McdDisable[2];

#define SIO_INT(eCycle) { \
	psxRegs.interrupt |= (1 << PSXINT_SIO); \
	psxRegs.intCycle[PSXINT_SIO].cycle = eCycle; \
	psxRegs.intCycle[PSXINT_SIO].sCycle = psxRegs.cycle; \
	new_dyna_set_event(PSXINT_SIO, eCycle); \
}

// clk cycle byte
// 4us * 8bits = (PSXCLK / 1000000) * 32; (linuzappz)
// TODO: add SioModePrescaler and BaudReg
#define SIO_CYCLES		535

void sioWrite8(unsigned char value) {
#ifdef PAD_LOG
	PAD_LOG("sio write8 %x\n", value);
#endif
	switch (padst) {
		case 1: SIO_INT(SIO_CYCLES);
			if ((value & 0x40) == 0x40) {
				padst = 2; parp = 1;
				if (!Config.UseNet) {
					switch (CtrlReg & 0x2002) {
						case 0x0002:
							buf[parp] = PAD1_poll(value);
							break;
						case 0x2002:
							buf[parp] = PAD2_poll(value);
							break;
					}
				}/* else {
//					SysPrintf("%x: %x, %x, %x, %x\n", CtrlReg&0x2002, buf[2], buf[3], buf[4], buf[5]);
				}*/

				if (!(buf[parp] & 0x0f)) {
					bufcount = 2 + 32;
				} else {
					bufcount = 2 + (buf[parp] & 0x0f) * 2;
				}
				if (buf[parp] == 0x41) {
					switch (value) {
						case 0x43:
							buf[1] = 0x43;
							break;
						case 0x45:
							buf[1] = 0xf3;
							break;
					}
				}
			}
			else padst = 0;
			return;
		case 2:
			parp++;
/*			if (buf[1] == 0x45) {
				buf[parp] = 0;
				SIO_INT(SIO_CYCLES);
				return;
			}*/
			if (!Config.UseNet) {
				switch (CtrlReg & 0x2002) {
					case 0x0002: buf[parp] = PAD1_poll(value); break;
					case 0x2002: buf[parp] = PAD2_poll(value); break;
				}
			}

			if (parp == bufcount) { padst = 0; return; }
			SIO_INT(SIO_CYCLES);
			return;
	}

	switch (mcdst) {
		case 1:
			SIO_INT(SIO_CYCLES);
			if (rdwr) { parp++; return; }
			parp = 1;
			switch (value) {
				case 0x52: rdwr = 1; break;
				case 0x57: rdwr = 2; break;
				default: mcdst = 0;
			}
			return;
		case 2: // address H
			SIO_INT(SIO_CYCLES);
			adrH = value;
			*buf = 0;
			parp = 0;
			bufcount = 1;
			mcdst = 3;
			return;
		case 3: // address L
			SIO_INT(SIO_CYCLES);
			adrL = value;
			*buf = adrH;
			parp = 0;
			bufcount = 1;
			mcdst = 4;
			return;
		case 4:
			SIO_INT(SIO_CYCLES);
			parp = 0;
			switch (rdwr) {
				case 1: // read
					buf[0] = 0x5c;
					buf[1] = 0x5d;
					buf[2] = adrH;
					buf[3] = adrL;
					switch (CtrlReg & 0x2002) {
						case 0x0002:
							memcpy(&buf[4], Mcd1Data + (adrL | (adrH << 8)) * 128, 128);
							break;
						case 0x2002:
							memcpy(&buf[4], Mcd2Data + (adrL | (adrH << 8)) * 128, 128);
							break;
					}
					{
					char xor = 0;
					int i;
					for (i = 2; i < 128 + 4; i++)
						xor ^= buf[i];
					buf[132] = xor;
					}
					buf[133] = 0x47;
					bufcount = 133;
					break;
				case 2: // write
					buf[0] = adrL;
					buf[1] = value;
					buf[129] = 0x5c;
					buf[130] = 0x5d;
					buf[131] = 0x47;
					bufcount = 131;
					break;
			}
			mcdst = 5;
			return;
		case 5:
			parp++;
			if ((rdwr == 1 && parp == 132) ||
			    (rdwr == 2 && parp == 129)) {
				// clear "new card" flags
				if (CtrlReg & 0x2000)
					cardh2[1] &= ~8;
				else
					cardh1[1] &= ~8;
			}
			if (rdwr == 2) {
				if (parp < 128) buf[parp + 1] = value;
			}
			SIO_INT(SIO_CYCLES);
			return;
	}

	switch (value) {
		case 0x01: // start pad
			StatReg |= RX_RDY;		// Transfer is Ready

			if (!Config.UseNet) {
				switch (CtrlReg & 0x2002) {
					case 0x0002: buf[0] = PAD1_startPoll(1); break;
					case 0x2002: buf[0] = PAD2_startPoll(2); break;
				}
			} else {
				if ((CtrlReg & 0x2002) == 0x0002) {
					int i, j;

					PAD1_startPoll(1);
					buf[0] = 0;
					buf[1] = PAD1_poll(0x42);
					if (!(buf[1] & 0x0f)) {
						bufcount = 32;
					} else {
						bufcount = (buf[1] & 0x0f) * 2;
					}
					buf[2] = PAD1_poll(0);
					i = 3;
					j = bufcount;
					while (j--) {
						buf[i++] = PAD1_poll(0);
					}
					bufcount+= 3;

					if (NET_sendPadData(buf, bufcount) == -1)
						netError();

					if (NET_recvPadData(buf, 1) == -1)
						netError();
					if (NET_recvPadData(buf + 128, 2) == -1)
						netError();
				} else {
					memcpy(buf, buf + 128, 32);
				}
			}

			bufcount = 2;
			parp = 0;
			padst = 1;
			SIO_INT(SIO_CYCLES);
			return;
		case 0x81: // start memcard
			if (CtrlReg & 0x2000)
			{
				if (McdDisable[1])
					goto no_device;
				memcpy(buf, cardh2, 4);
			}
			else
			{
				if (McdDisable[0])
					goto no_device;
				memcpy(buf, cardh1, 4);
			}
			StatReg |= RX_RDY;
			parp = 0;
			bufcount = 3;
			mcdst = 1;
			rdwr = 0;
			SIO_INT(SIO_CYCLES);
			return;
		default:
		no_device:
			StatReg |= RX_RDY;
			buf[0] = 0xff;
			parp = 0;
			bufcount = 0;
			return;
	}
}

void sioWriteStat16(unsigned short value) {
}

void sioWriteMode16(unsigned short value) {
	ModeReg = value;
}

void sioWriteCtrl16(unsigned short value) {
	CtrlReg = value & ~RESET_ERR;
	if (value & RESET_ERR) StatReg &= ~IRQ;
	if ((CtrlReg & SIO_RESET) || !(CtrlReg & DTR)) {
		padst = 0; mcdst = 0; parp = 0;
		StatReg = TX_RDY | TX_EMPTY;
		psxRegs.interrupt &= ~(1 << PSXINT_SIO);
	}
}

void sioWriteBaud16(unsigned short value) {
	BaudReg = value;
}

unsigned char sioRead8() {
	unsigned char ret = 0;

	if ((StatReg & RX_RDY)/* && (CtrlReg & RX_PERM)*/) {
//		StatReg &= ~RX_OVERRUN;
		ret = buf[parp];
		if (parp == bufcount) {
			StatReg &= ~RX_RDY;		// Receive is not Ready now
			if (mcdst == 5) {
				mcdst = 0;
				if (rdwr == 2) {
					switch (CtrlReg & 0x2002) {
						case 0x0002:
							memcpy(Mcd1Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
							SaveMcd(Config.Mcd1, Mcd1Data, (adrL | (adrH << 8)) * 128, 128);
							break;
						case 0x2002:
							memcpy(Mcd2Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
							SaveMcd(Config.Mcd2, Mcd2Data, (adrL | (adrH << 8)) * 128, 128);
							break;
					}
				}
			}
			if (padst == 2) padst = 0;
			if (mcdst == 1) {
				mcdst = 2;
				StatReg|= RX_RDY;
			}
		}
	}

#ifdef PAD_LOG
	PAD_LOG("sio read8 ;ret = %x\n", ret);
#endif
	return ret;
}

unsigned short sioReadStat16() {
	return StatReg;
}

unsigned short sioReadMode16() {
	return ModeReg;
}

unsigned short sioReadCtrl16() {
	return CtrlReg;
}

unsigned short sioReadBaud16() {
	return BaudReg;
}

void netError() {
	ClosePlugins();
	SysMessage(_("Connection closed!\n"));

	CdromId[0] = '\0';
	CdromLabel[0] = '\0';

	SysRunGui();
}

void sioInterrupt() {
#ifdef PAD_LOG
	PAD_LOG("Sio Interrupt (CP0.Status = %x)\n", psxRegs.CP0.n.Status);
#endif
//	SysPrintf("Sio Interrupt\n");
	if (!(StatReg & IRQ)) {
		StatReg |= IRQ;
		psxHu32ref(0x1070) |= SWAPu32(0x80);
	}
}

void LoadMcd(int mcd, char *str) {
	FILE *f;
	char *data = NULL;

	if (mcd != 1 && mcd != 2)
		return;

	if (mcd == 1) {
		data = Mcd1Data;
		cardh1[1] |= 8; // mark as new
	}
	if (mcd == 2) {
		data = Mcd2Data;
		cardh2[1] |= 8;
	}

	McdDisable[mcd - 1] = 0;
#ifdef HAVE_LIBRETRO
	// memcard1 is handled by libretro
	if (mcd == 1)
		return;
#endif

	if (str == NULL || strcmp(str, "none") == 0) {
		McdDisable[mcd - 1] = 1;
		return;
	}
	if (*str == 0)
		return;

	f = fopen(str, "rb");
	if (f == NULL) {
		SysPrintf(_("The memory card %s doesn't exist - creating it\n"), str);
		CreateMcd(str);
		f = fopen(str, "rb");
		if (f != NULL) {
			struct stat buf;

			if (stat(str, &buf) != -1) {
				if (buf.st_size == MCD_SIZE + 64)
					fseek(f, 64, SEEK_SET);
				else if(buf.st_size == MCD_SIZE + 3904)
					fseek(f, 3904, SEEK_SET);
			}
			if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
#ifndef NDEBUG
				SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
#endif
				memset(data, 0x00, MCD_SIZE);
			}
			fclose(f);
		}
		else
			SysMessage(_("Memory card %s failed to load!\n"), str);
	}
	else {
		struct stat buf;
		SysPrintf(_("Loading memory card %s\n"), str);
		if (stat(str, &buf) != -1) {
			if (buf.st_size == MCD_SIZE + 64)
				fseek(f, 64, SEEK_SET);
			else if(buf.st_size == MCD_SIZE + 3904)
				fseek(f, 3904, SEEK_SET);
		}
		if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
#ifndef NDEBUG
			SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
#endif
			memset(data, 0x00, MCD_SIZE);
		}
		fclose(f);
	}
}

void LoadMcds(char *mcd1, char *mcd2) {
	LoadMcd(1, mcd1);
	LoadMcd(2, mcd2);
}

void SaveMcd(char *mcd, char *data, uint32_t adr, int size) {
	FILE *f;

	if (mcd == NULL || *mcd == 0 || strcmp(mcd, "none") == 0)
		return;

	f = fopen(mcd, "r+b");
	if (f != NULL) {
		struct stat buf;

		if (stat(mcd, &buf) != -1) {
			if (buf.st_size == MCD_SIZE + 64)
				fseek(f, adr + 64, SEEK_SET);
			else if (buf.st_size == MCD_SIZE + 3904)
				fseek(f, adr + 3904, SEEK_SET);
			else
				fseek(f, adr, SEEK_SET);
		} else
			fseek(f, adr, SEEK_SET);

		fwrite(data + adr, 1, size, f);
		fclose(f);
		return;
	}

#if 0
	// try to create it again if we can't open it
	f = fopen(mcd, "wb");
	if (f != NULL) {
		fwrite(data, 1, MCD_SIZE, f);
		fclose(f);
	}
#endif

	ConvertMcd(mcd, data);
}

void CreateMcd(char *mcd) {
	FILE *f;
	struct stat buf;
	int s = MCD_SIZE;
	int i = 0, j;

	f = fopen(mcd, "wb");
	if (f == NULL)
		return;

	if (stat(mcd, &buf) != -1) {
		if ((buf.st_size == MCD_SIZE + 3904) || strstr(mcd, ".gme")) {
			s = s + 3904;
			fputc('1', f);
			s--;
			fputc('2', f);
			s--;
			fputc('3', f);
			s--;
			fputc('-', f);
			s--;
			fputc('4', f);
			s--;
			fputc('5', f);
			s--;
			fputc('6', f);
			s--;
			fputc('-', f);
			s--;
			fputc('S', f);
			s--;
			fputc('T', f);
			s--;
			fputc('D', f);
			s--;
			for (i = 0; i < 7; i++) {
				fputc(0, f);
				s--;
			}
			fputc(1, f);
			s--;
			fputc(0, f);
			s--;
			fputc(1, f);
			s--;
			fputc('M', f);
			s--;
			fputc('Q', f);
			s--;
			for (i = 0; i < 14; i++) {
				fputc(0xa0, f);
				s--;
			}
			fputc(0, f);
			s--;
			fputc(0xff, f);
			while (s-- > (MCD_SIZE + 1))
				fputc(0, f);
		} else if ((buf.st_size == MCD_SIZE + 64) || strstr(mcd, ".mem") || strstr(mcd, ".vgs")) {
			s = s + 64;
			fputc('V', f);
			s--;
			fputc('g', f);
			s--;
			fputc('s', f);
			s--;
			fputc('M', f);
			s--;
			for (i = 0; i < 3; i++) {
				fputc(1, f);
				s--;
				fputc(0, f);
				s--;
				fputc(0, f);
				s--;
				fputc(0, f);
				s--;
			}
			fputc(0, f);
			s--;
			fputc(2, f);
			while (s-- > (MCD_SIZE + 1))
				fputc(0, f);
		}
	}
	fputc('M', f);
	s--;
	fputc('C', f);
	s--;
	while (s-- > (MCD_SIZE - 127))
		fputc(0, f);
	fputc(0xe, f);
	s--;

	for (i = 0; i < 15; i++) { // 15 blocks
		fputc(0xa0, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0xff, f);
		s--;
		fputc(0xff, f);
		s--;
		for (j = 0; j < 117; j++) {
			fputc(0x00, f);
			s--;
		}
		fputc(0xa0, f);
		s--;
	}

	for (i = 0; i < 20; i++) {
		fputc(0xff, f);
		s--;
		fputc(0xff, f);
		s--;
		fputc(0xff, f);
		s--;
		fputc(0xff, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0x00, f);
		s--;
		fputc(0xff, f);
		s--;
		fputc(0xff, f);
		s--;
		for (j = 0; j < 118; j++) {
			fputc(0x00, f);
			s--;
		}
	}

	while ((s--) >= 0)
		fputc(0, f);

	fclose(f);
}

void ConvertMcd(char *mcd, char *data) {
	FILE *f;
	int i = 0;
	int s = MCD_SIZE;

	if (strstr(mcd, ".gme")) {
		f = fopen(mcd, "wb");
		if (f != NULL) {
			fwrite(data - 3904, 1, MCD_SIZE + 3904, f);
			fclose(f);
		}
		f = fopen(mcd, "r+");
		if (f == NULL) return;
		s = s + 3904;
		fputc('1', f); s--;
		fputc('2', f); s--;
		fputc('3', f); s--;
		fputc('-', f); s--;
		fputc('4', f); s--;
		fputc('5', f); s--;
		fputc('6', f); s--;
		fputc('-', f); s--;
		fputc('S', f); s--;
		fputc('T', f); s--;
		fputc('D', f); s--;
		for (i = 0; i < 7; i++) {
			fputc(0, f); s--;
		}
		fputc(1, f); s--;
		fputc(0, f); s--;
		fputc(1, f); s--;
		fputc('M', f); s--;
		fputc('Q', f); s--;
		for(i=0;i<14;i++) {
			fputc(0xa0, f); s--;
		}
		fputc(0, f); s--;
		fputc(0xff, f);
		while (s-- > (MCD_SIZE+1)) fputc(0, f);
		fclose(f);
	} else if(strstr(mcd, ".mem") || strstr(mcd,".vgs")) {
		f = fopen(mcd, "wb");
		if (f != NULL) {
			fwrite(data-64, 1, MCD_SIZE+64, f);
			fclose(f);
		}
		f = fopen(mcd, "r+");
		if (f == NULL) return;
		s = s + 64;
		fputc('V', f); s--;
		fputc('g', f); s--;
		fputc('s', f); s--;
		fputc('M', f); s--;
		for(i=0;i<3;i++) {
			fputc(1, f); s--;
			fputc(0, f); s--;
			fputc(0, f); s--;
			fputc(0, f); s--;
		}
		fputc(0, f); s--;
		fputc(2, f);
		while (s-- > (MCD_SIZE+1)) fputc(0, f);
		fclose(f);
	} else {
		f = fopen(mcd, "wb");
		if (f != NULL) {
			fwrite(data, 1, MCD_SIZE, f);
			fclose(f);
		}
	}
}

void GetMcdBlockInfo(int mcd, int block, McdBlock *Info) {
	char *data = NULL, *ptr, *str, *sstr;
	unsigned short clut[16];
	unsigned short c;
	int i, x;

	memset(Info, 0, sizeof(McdBlock));

	if (mcd != 1 && mcd != 2)
		return;

	if (McdDisable[mcd - 1])
		return;

	if (mcd == 1) data = Mcd1Data;
	if (mcd == 2) data = Mcd2Data;

	ptr = data + block * 8192 + 2;

	Info->IconCount = *ptr & 0x3;

	ptr += 2;

	x = 0;

	str = Info->Title;
	sstr = Info->sTitle;

	for (i = 0; i < 48; i++) {
		c = *(ptr) << 8;
		c |= *(ptr + 1);
		if (!c) break;

		// Convert ASCII characters to half-width
		if (c >= 0x8281 && c <= 0x829A)
			c = (c - 0x8281) + 'a';
		else if (c >= 0x824F && c <= 0x827A)
			c = (c - 0x824F) + '0';
		else if (c == 0x8140) c = ' ';
		else if (c == 0x8143) c = ',';
		else if (c == 0x8144) c = '.';
		else if (c == 0x8146) c = ':';
		else if (c == 0x8147) c = ';';
		else if (c == 0x8148) c = '?';
		else if (c == 0x8149) c = '!';
		else if (c == 0x815E) c = '/';
		else if (c == 0x8168) c = '"';
		else if (c == 0x8169) c = '(';
		else if (c == 0x816A) c = ')';
		else if (c == 0x816D) c = '[';
		else if (c == 0x816E) c = ']';
		else if (c == 0x817C) c = '-';
		else {
			str[i] = ' ';
			sstr[x++] = *ptr++; sstr[x++] = *ptr++;
			continue;
		}

		str[i] = sstr[x++] = c;
		ptr += 2;
	}

	trim(str);
	trim(sstr);

	ptr = data + block * 8192 + 0x60; // icon palette data

	for (i = 0; i < 16; i++) {
		clut[i] = *((unsigned short *)ptr);
		ptr += 2;
	}

	for (i = 0; i < Info->IconCount; i++) {
		short *icon = &Info->Icon[i * 16 * 16];

		ptr = data + block * 8192 + 128 + 128 * i; // icon data

		for (x = 0; x < 16 * 16; x++) {
			icon[x++] = clut[*ptr & 0xf];
			icon[x] = clut[*ptr >> 4];
			ptr++;
		}
	}

	ptr = data + block * 128;

	Info->Flags = *ptr;

	ptr += 0xa;
	strncpy(Info->ID, ptr, 12);
	ptr += 12;
	strncpy(Info->Name, ptr, 16);
}

int sioFreeze(void *f, int Mode) {
	gzfreeze(buf, sizeof(buf));
	gzfreeze(&StatReg, sizeof(StatReg));
	gzfreeze(&ModeReg, sizeof(ModeReg));
	gzfreeze(&CtrlReg, sizeof(CtrlReg));
	gzfreeze(&BaudReg, sizeof(BaudReg));
	gzfreeze(&bufcount, sizeof(bufcount));
	gzfreeze(&parp, sizeof(parp));
	gzfreeze(&mcdst, sizeof(mcdst));
	gzfreeze(&rdwr, sizeof(rdwr));
	gzfreeze(&adrH, sizeof(adrH));
	gzfreeze(&adrL, sizeof(adrL));
	gzfreeze(&padst, sizeof(padst));

	return 0;
}
Commit	Line	Data
ef79bbde P	1	/***************************************************************************
	2	* Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team *
	3	* *
	4	* This program is free software; you can redistribute it and/or modify *
	5	* it under the terms of the GNU General Public License as published by *
	6	* the Free Software Foundation; either version 2 of the License, or *
	7	* (at your option) any later version. *
	8	* *
	9	* This program is distributed in the hope that it will be useful, *
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	12	* GNU General Public License for more details. *
	13	* *
	14	* You should have received a copy of the GNU General Public License *
	15	* along with this program; if not, write to the *
	16	* Free Software Foundation, Inc., *
	17	* 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA. *
	18	***************************************************************************/
	19
	20	/*
	21	* SIO functions.
	22	*/
	23
	24	#include "sio.h"
	25	#include <sys/stat.h>
	26
7a8d521f	27	#ifdef USE_LIBRETRO_VFS
	28	#include <streams/file_stream_transforms.h>
	29	#endif
	30
ef79bbde P	31	// Status Flags
	32	#define TX_RDY 0x0001
	33	#define RX_RDY 0x0002
	34	#define TX_EMPTY 0x0004
	35	#define PARITY_ERR 0x0008
	36	#define RX_OVERRUN 0x0010
	37	#define FRAMING_ERR 0x0020
	38	#define SYNC_DETECT 0x0040
	39	#define DSR 0x0080
	40	#define CTS 0x0100
	41	#define IRQ 0x0200
	42
	43	// Control Flags
	44	#define TX_PERM 0x0001
	45	#define DTR 0x0002
	46	#define RX_PERM 0x0004
	47	#define BREAK 0x0008
	48	#define RESET_ERR 0x0010
	49	#define RTS 0x0020
	50	#define SIO_RESET 0x0040
	51
	52	// * FOR WORKS ON PADS AND MEMORY CARDS ***
	53
	54	static unsigned char buf[256];
f3a77032	55	static unsigned char cardh1[4] = { 0xff, 0x08, 0x5a, 0x5d };
f3a77032	56	static unsigned char cardh2[4] = { 0xff, 0x08, 0x5a, 0x5d };
ef79bbde P	57
	58	// Transfer Ready and the Buffer is Empty
	59	// static unsigned short StatReg = 0x002b;
	60	static unsigned short StatReg = TX_RDY \| TX_EMPTY;
	61	static unsigned short ModeReg;
	62	static unsigned short CtrlReg;
	63	static unsigned short BaudReg;
	64
	65	static unsigned int bufcount;
	66	static unsigned int parp;
	67	static unsigned int mcdst, rdwr;
	68	static unsigned char adrH, adrL;
	69	static unsigned int padst;
	70
	71	char Mcd1Data[MCD_SIZE], Mcd2Data[MCD_SIZE];
f3a77032	72	char McdDisable[2];
ef79bbde	73
d28b54b1	74	#define SIO_INT(eCycle) { \
d014a471	75	psxRegs.interrupt \|= (1 << PSXINT_SIO); \
	76	psxRegs.intCycle[PSXINT_SIO].cycle = eCycle; \
	77	psxRegs.intCycle[PSXINT_SIO].sCycle = psxRegs.cycle; \
	78	new_dyna_set_event(PSXINT_SIO, eCycle); \
d28b54b1	79	}
d28b54b1	80
ef79bbde P	81	// clk cycle byte
	82	// 4us * 8bits = (PSXCLK / 1000000) * 32; (linuzappz)
	83	// TODO: add SioModePrescaler and BaudReg
d28b54b1	84	#define SIO_CYCLES 535
ef79bbde P	85
	86	void sioWrite8(unsigned char value) {
	87	#ifdef PAD_LOG
	88	PAD_LOG("sio write8 %x\n", value);
	89	#endif
	90	switch (padst) {
d28b54b1	91	case 1: SIO_INT(SIO_CYCLES);
ef79bbde P	92	if ((value & 0x40) == 0x40) {
	93	padst = 2; parp = 1;
	94	if (!Config.UseNet) {
	95	switch (CtrlReg & 0x2002) {
	96	case 0x0002:
	97	buf[parp] = PAD1_poll(value);
	98	break;
	99	case 0x2002:
	100	buf[parp] = PAD2_poll(value);
	101	break;
	102	}
	103	}/* else {
	104	// SysPrintf("%x: %x, %x, %x, %x\n", CtrlReg&0x2002, buf[2], buf[3], buf[4], buf[5]);
	105	}*/
	106
	107	if (!(buf[parp] & 0x0f)) {
	108	bufcount = 2 + 32;
	109	} else {
	110	bufcount = 2 + (buf[parp] & 0x0f) * 2;
	111	}
	112	if (buf[parp] == 0x41) {
	113	switch (value) {
	114	case 0x43:
	115	buf[1] = 0x43;
	116	break;
	117	case 0x45:
	118	buf[1] = 0xf3;
	119	break;
	120	}
	121	}
	122	}
	123	else padst = 0;
	124	return;
	125	case 2:
	126	parp++;
	127	/* if (buf[1] == 0x45) {
	128	buf[parp] = 0;
d28b54b1	129	SIO_INT(SIO_CYCLES);
ef79bbde P	130	return;
	131	}*/
	132	if (!Config.UseNet) {
	133	switch (CtrlReg & 0x2002) {
	134	case 0x0002: buf[parp] = PAD1_poll(value); break;
	135	case 0x2002: buf[parp] = PAD2_poll(value); break;
	136	}
	137	}
	138
	139	if (parp == bufcount) { padst = 0; return; }
d28b54b1	140	SIO_INT(SIO_CYCLES);
ef79bbde P	141	return;
	142	}
	143
	144	switch (mcdst) {
	145	case 1:
d28b54b1	146	SIO_INT(SIO_CYCLES);
ef79bbde P	147	if (rdwr) { parp++; return; }
	148	parp = 1;
	149	switch (value) {
	150	case 0x52: rdwr = 1; break;
	151	case 0x57: rdwr = 2; break;
	152	default: mcdst = 0;
	153	}
	154	return;
	155	case 2: // address H
d28b54b1	156	SIO_INT(SIO_CYCLES);
ef79bbde P	157	adrH = value;
	158	*buf = 0;
	159	parp = 0;
	160	bufcount = 1;
	161	mcdst = 3;
	162	return;
	163	case 3: // address L
d28b54b1	164	SIO_INT(SIO_CYCLES);
ef79bbde P	165	adrL = value;
	166	*buf = adrH;
	167	parp = 0;
	168	bufcount = 1;
	169	mcdst = 4;
	170	return;
	171	case 4:
d28b54b1	172	SIO_INT(SIO_CYCLES);
ef79bbde P	173	parp = 0;
	174	switch (rdwr) {
	175	case 1: // read
	176	buf[0] = 0x5c;
	177	buf[1] = 0x5d;
	178	buf[2] = adrH;
	179	buf[3] = adrL;
	180	switch (CtrlReg & 0x2002) {
	181	case 0x0002:
	182	memcpy(&buf[4], Mcd1Data + (adrL \| (adrH << 8)) * 128, 128);
	183	break;
	184	case 0x2002:
	185	memcpy(&buf[4], Mcd2Data + (adrL \| (adrH << 8)) * 128, 128);
	186	break;
	187	}
	188	{
	189	char xor = 0;
	190	int i;
	191	for (i = 2; i < 128 + 4; i++)
	192	xor ^= buf[i];
	193	buf[132] = xor;
	194	}
	195	buf[133] = 0x47;
	196	bufcount = 133;
	197	break;
	198	case 2: // write
	199	buf[0] = adrL;
	200	buf[1] = value;
	201	buf[129] = 0x5c;
	202	buf[130] = 0x5d;
	203	buf[131] = 0x47;
	204	bufcount = 131;
	205	break;
	206	}
	207	mcdst = 5;
	208	return;
	209	case 5:
	210	parp++;
f3a77032	211	if ((rdwr == 1 && parp == 132) \|\|
	212	(rdwr == 2 && parp == 129)) {
	213	// clear "new card" flags
	214	if (CtrlReg & 0x2000)
	215	cardh2[1] &= ~8;
	216	else
	217	cardh1[1] &= ~8;
	218	}
ef79bbde P	219	if (rdwr == 2) {
	220	if (parp < 128) buf[parp + 1] = value;
	221	}
d28b54b1	222	SIO_INT(SIO_CYCLES);
ef79bbde P	223	return;
	224	}
	225
	226	switch (value) {
	227	case 0x01: // start pad
	228	StatReg \|= RX_RDY; // Transfer is Ready
	229
	230	if (!Config.UseNet) {
	231	switch (CtrlReg & 0x2002) {
	232	case 0x0002: buf[0] = PAD1_startPoll(1); break;
	233	case 0x2002: buf[0] = PAD2_startPoll(2); break;
	234	}
	235	} else {
	236	if ((CtrlReg & 0x2002) == 0x0002) {
	237	int i, j;
	238
	239	PAD1_startPoll(1);
	240	buf[0] = 0;
	241	buf[1] = PAD1_poll(0x42);
	242	if (!(buf[1] & 0x0f)) {
	243	bufcount = 32;
	244	} else {
	245	bufcount = (buf[1] & 0x0f) * 2;
	246	}
	247	buf[2] = PAD1_poll(0);
	248	i = 3;
	249	j = bufcount;
	250	while (j--) {
	251	buf[i++] = PAD1_poll(0);
	252	}
	253	bufcount+= 3;
	254
	255	if (NET_sendPadData(buf, bufcount) == -1)
	256	netError();
	257
	258	if (NET_recvPadData(buf, 1) == -1)
	259	netError();
	260	if (NET_recvPadData(buf + 128, 2) == -1)
	261	netError();
	262	} else {
	263	memcpy(buf, buf + 128, 32);
	264	}
	265	}
	266
	267	bufcount = 2;
	268	parp = 0;
	269	padst = 1;
d28b54b1	270	SIO_INT(SIO_CYCLES);
ef79bbde P	271	return;
ef79bbde P	272	case 0x81: // start memcard
f3a77032	273	if (CtrlReg & 0x2000)
	274	{
	275	if (McdDisable[1])
	276	goto no_device;
	277	memcpy(buf, cardh2, 4);
	278	}
	279	else
	280	{
	281	if (McdDisable[0])
	282	goto no_device;
	283	memcpy(buf, cardh1, 4);
	284	}
ef79bbde	285	StatReg \|= RX_RDY;
ef79bbde P	286	parp = 0;
	287	bufcount = 3;
	288	mcdst = 1;
	289	rdwr = 0;
d28b54b1	290	SIO_INT(SIO_CYCLES);
ef79bbde	291	return;
f3a77032	292	default:
	293	no_device:
	294	StatReg \|= RX_RDY;
	295	buf[0] = 0xff;
	296	parp = 0;
	297	bufcount = 0;
	298	return;
ef79bbde P	299	}
	300	}
	301
	302	void sioWriteStat16(unsigned short value) {
	303	}
	304
	305	void sioWriteMode16(unsigned short value) {
	306	ModeReg = value;
	307	}
	308
	309	void sioWriteCtrl16(unsigned short value) {
	310	CtrlReg = value & ~RESET_ERR;
	311	if (value & RESET_ERR) StatReg &= ~IRQ;
7d95d6fa	312	if ((CtrlReg & SIO_RESET) \|\| !(CtrlReg & DTR)) {
ef79bbde P	313	padst = 0; mcdst = 0; parp = 0;
ef79bbde P	314	StatReg = TX_RDY \| TX_EMPTY;
d28b54b1	315	psxRegs.interrupt &= ~(1 << PSXINT_SIO);
ef79bbde P	316	}
	317	}
	318
	319	void sioWriteBaud16(unsigned short value) {
	320	BaudReg = value;
	321	}
	322
	323	unsigned char sioRead8() {
	324	unsigned char ret = 0;
	325
	326	if ((StatReg & RX_RDY)/* && (CtrlReg & RX_PERM)*/) {
	327	// StatReg &= ~RX_OVERRUN;
	328	ret = buf[parp];
	329	if (parp == bufcount) {
	330	StatReg &= ~RX_RDY; // Receive is not Ready now
	331	if (mcdst == 5) {
	332	mcdst = 0;
	333	if (rdwr == 2) {
	334	switch (CtrlReg & 0x2002) {
	335	case 0x0002:
	336	memcpy(Mcd1Data + (adrL \| (adrH << 8)) * 128, &buf[1], 128);
	337	SaveMcd(Config.Mcd1, Mcd1Data, (adrL \| (adrH << 8)) * 128, 128);
	338	break;
	339	case 0x2002:
	340	memcpy(Mcd2Data + (adrL \| (adrH << 8)) * 128, &buf[1], 128);
	341	SaveMcd(Config.Mcd2, Mcd2Data, (adrL \| (adrH << 8)) * 128, 128);
	342	break;
	343	}
	344	}
	345	}
	346	if (padst == 2) padst = 0;
	347	if (mcdst == 1) {
	348	mcdst = 2;
	349	StatReg\|= RX_RDY;
	350	}
	351	}
	352	}
	353
	354	#ifdef PAD_LOG
	355	PAD_LOG("sio read8 ;ret = %x\n", ret);
	356	#endif
	357	return ret;
	358	}
	359
	360	unsigned short sioReadStat16() {
	361	return StatReg;
	362	}
	363
	364	unsigned short sioReadMode16() {
	365	return ModeReg;
	366	}
	367
	368	unsigned short sioReadCtrl16() {
	369	return CtrlReg;
	370	}
	371
	372	unsigned short sioReadBaud16() {
	373	return BaudReg;
	374	}
	375
	376	void netError() {
	377	ClosePlugins();
	378	SysMessage(_("Connection closed!\n"));
	379
380	CdromId[0] = '\0';
381	CdromLabel[0] = '\0';
382
383	SysRunGui();
384	}
385
386	void sioInterrupt() {
387	#ifdef PAD_LOG
388	PAD_LOG("Sio Interrupt (CP0.Status = %x)\n", psxRegs.CP0.n.Status);
389	#endif
390	// SysPrintf("Sio Interrupt\n");
aa35134a	391	if (!(StatReg & IRQ)) {
	392	StatReg \|= IRQ;
	393	psxHu32ref(0x1070) \|= SWAPu32(0x80);
	394	}
ef79bbde P	395	}
	396
	397	void LoadMcd(int mcd, char *str) {
	398	FILE *f;
	399	char *data = NULL;
	400
f3a77032	401	if (mcd != 1 && mcd != 2)
f3a77032	402	return;
ef79bbde	403
f3a77032	404	if (mcd == 1) {
	405	data = Mcd1Data;
	406	cardh1[1] \|= 8; // mark as new
	407	}
	408	if (mcd == 2) {
	409	data = Mcd2Data;
	410	cardh2[1] \|= 8;
	411	}
	412
	413	McdDisable[mcd - 1] = 0;
7a8d521f	414	#ifdef HAVE_LIBRETRO
	415	// memcard1 is handled by libretro
	416	if (mcd == 1)
	417	return;
	418	#endif
	419
6f18d16a	420	if (str == NULL \|\| strcmp(str, "none") == 0) {
f3a77032	421	McdDisable[mcd - 1] = 1;
f3a77032	422	return;
ef79bbde	423	}
6f18d16a	424	if (*str == 0)
	425	return;
	426
ef79bbde P	427	f = fopen(str, "rb");
	428	if (f == NULL) {
	429	SysPrintf(_("The memory card %s doesn't exist - creating it\n"), str);
	430	CreateMcd(str);
	431	f = fopen(str, "rb");
	432	if (f != NULL) {
	433	struct stat buf;
	434
	435	if (stat(str, &buf) != -1) {
	436	if (buf.st_size == MCD_SIZE + 64)
	437	fseek(f, 64, SEEK_SET);
	438	else if(buf.st_size == MCD_SIZE + 3904)
	439	fseek(f, 3904, SEEK_SET);
	440	}
7a8d521f	441	if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
	442	#ifndef NDEBUG
	443	SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
	444	#endif
	445	memset(data, 0x00, MCD_SIZE);
	446	}
ef79bbde P	447	fclose(f);
	448	}
	449	else
	450	SysMessage(_("Memory card %s failed to load!\n"), str);
	451	}
	452	else {
	453	struct stat buf;
	454	SysPrintf(_("Loading memory card %s\n"), str);
	455	if (stat(str, &buf) != -1) {
	456	if (buf.st_size == MCD_SIZE + 64)
	457	fseek(f, 64, SEEK_SET);
	458	else if(buf.st_size == MCD_SIZE + 3904)
	459	fseek(f, 3904, SEEK_SET);
	460	}
7a8d521f	461	if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
	462	#ifndef NDEBUG
	463	SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
	464	#endif
	465	memset(data, 0x00, MCD_SIZE);
	466	}
ef79bbde P	467	fclose(f);
	468	}
	469	}
	470
	471	void LoadMcds(char mcd1, char mcd2) {
	472	LoadMcd(1, mcd1);
	473	LoadMcd(2, mcd2);
	474	}
	475
	476	void SaveMcd(char mcd, char data, uint32_t adr, int size) {
	477	FILE *f;
	478
6f18d16a	479	if (mcd == NULL \|\| *mcd == 0 \|\| strcmp(mcd, "none") == 0)
	480	return;
	481
ef79bbde P	482	f = fopen(mcd, "r+b");
	483	if (f != NULL) {
	484	struct stat buf;
	485
	486	if (stat(mcd, &buf) != -1) {
	487	if (buf.st_size == MCD_SIZE + 64)
	488	fseek(f, adr + 64, SEEK_SET);
	489	else if (buf.st_size == MCD_SIZE + 3904)
	490	fseek(f, adr + 3904, SEEK_SET);
	491	else
	492	fseek(f, adr, SEEK_SET);
	493	} else
	494	fseek(f, adr, SEEK_SET);
	495
	496	fwrite(data + adr, 1, size, f);
	497	fclose(f);
	498	return;
	499	}
	500
	501	#if 0
	502	// try to create it again if we can't open it
	503	f = fopen(mcd, "wb");
	504	if (f != NULL) {
	505	fwrite(data, 1, MCD_SIZE, f);
	506	fclose(f);
	507	}
	508	#endif
	509
	510	ConvertMcd(mcd, data);
	511	}
	512
	513	void CreateMcd(char *mcd) {
	514	FILE *f;
	515	struct stat buf;
	516	int s = MCD_SIZE;
	517	int i = 0, j;
	518
	519	f = fopen(mcd, "wb");
	520	if (f == NULL)
	521	return;
	522
	523	if (stat(mcd, &buf) != -1) {
	524	if ((buf.st_size == MCD_SIZE + 3904) \|\| strstr(mcd, ".gme")) {
	525	s = s + 3904;
	526	fputc('1', f);
	527	s--;
	528	fputc('2', f);
	529	s--;
	530	fputc('3', f);
	531	s--;
	532	fputc('-', f);
	533	s--;
	534	fputc('4', f);
	535	s--;
	536	fputc('5', f);
	537	s--;
	538	fputc('6', f);
	539	s--;
	540	fputc('-', f);
	541	s--;
	542	fputc('S', f);
	543	s--;
	544	fputc('T', f);
	545	s--;
546	fputc('D', f);
547	s--;
548	for (i = 0; i < 7; i++) {
549	fputc(0, f);
550	s--;
551	}
552	fputc(1, f);
553	s--;
554	fputc(0, f);
555	s--;
556	fputc(1, f);
557	s--;
558	fputc('M', f);
559	s--;
560	fputc('Q', f);
561	s--;
562	for (i = 0; i < 14; i++) {
563	fputc(0xa0, f);
564	s--;
565	}
566	fputc(0, f);
567	s--;
568	fputc(0xff, f);
569	while (s-- > (MCD_SIZE + 1))
570	fputc(0, f);
571	} else if ((buf.st_size == MCD_SIZE + 64) \|\| strstr(mcd, ".mem") \|\| strstr(mcd, ".vgs")) {
572	s = s + 64;
573	fputc('V', f);
574	s--;
575	fputc('g', f);
576	s--;
577	fputc('s', f);
578	s--;
579	fputc('M', f);
580	s--;
581	for (i = 0; i < 3; i++) {
582	fputc(1, f);
583	s--;
584	fputc(0, f);
585	s--;
586	fputc(0, f);
587	s--;
588	fputc(0, f);
589	s--;
590	}
591	fputc(0, f);
592	s--;
593	fputc(2, f);
594	while (s-- > (MCD_SIZE + 1))
595	fputc(0, f);
596	}
597	}
598	fputc('M', f);
599	s--;
600	fputc('C', f);
601	s--;
602	while (s-- > (MCD_SIZE - 127))
603	fputc(0, f);
604	fputc(0xe, f);
605	s--;
606
607	for (i = 0; i < 15; i++) { // 15 blocks
608	fputc(0xa0, f);
609	s--;
610	fputc(0x00, f);
611	s--;
612	fputc(0x00, f);
613	s--;
614	fputc(0x00, f);
615	s--;
616	fputc(0x00, f);
617	s--;
618	fputc(0x00, f);
619	s--;
620	fputc(0x00, f);
621	s--;
622	fputc(0x00, f);
623	s--;
624	fputc(0xff, f);
625	s--;
626	fputc(0xff, f);
627	s--;
628	for (j = 0; j < 117; j++) {
629	fputc(0x00, f);
630	s--;
631	}
632	fputc(0xa0, f);
633	s--;
634	}
635
636	for (i = 0; i < 20; i++) {
637	fputc(0xff, f);
638	s--;
639	fputc(0xff, f);
640	s--;
641	fputc(0xff, f);
642	s--;
643	fputc(0xff, f);
644	s--;
645	fputc(0x00, f);
646	s--;
647	fputc(0x00, f);
648	s--;
649	fputc(0x00, f);
650	s--;
651	fputc(0x00, f);
652	s--;
653	fputc(0xff, f);
654	s--;
655	fputc(0xff, f);
656	s--;
657	for (j = 0; j < 118; j++) {
658	fputc(0x00, f);
659	s--;
660	}
661	}
662
663	while ((s--) >= 0)
664	fputc(0, f);
665
666	fclose(f);
667	}
668
669	void ConvertMcd(char mcd, char data) {
670	FILE *f;
671	int i = 0;
672	int s = MCD_SIZE;
673
674	if (strstr(mcd, ".gme")) {
675	f = fopen(mcd, "wb");
676	if (f != NULL) {
677	fwrite(data - 3904, 1, MCD_SIZE + 3904, f);
678	fclose(f);
679	}
680	f = fopen(mcd, "r+");
cfa5a2af	681	if (f == NULL) return;
ef79bbde P	682	s = s + 3904;
	683	fputc('1', f); s--;
	684	fputc('2', f); s--;
	685	fputc('3', f); s--;
	686	fputc('-', f); s--;
	687	fputc('4', f); s--;
	688	fputc('5', f); s--;
	689	fputc('6', f); s--;
	690	fputc('-', f); s--;
	691	fputc('S', f); s--;
	692	fputc('T', f); s--;
	693	fputc('D', f); s--;
	694	for (i = 0; i < 7; i++) {
	695	fputc(0, f); s--;
	696	}
	697	fputc(1, f); s--;
	698	fputc(0, f); s--;
	699	fputc(1, f); s--;
	700	fputc('M', f); s--;
	701	fputc('Q', f); s--;
	702	for(i=0;i<14;i++) {
	703	fputc(0xa0, f); s--;
	704	}
	705	fputc(0, f); s--;
	706	fputc(0xff, f);
	707	while (s-- > (MCD_SIZE+1)) fputc(0, f);
	708	fclose(f);
	709	} else if(strstr(mcd, ".mem") \|\| strstr(mcd,".vgs")) {
	710	f = fopen(mcd, "wb");
	711	if (f != NULL) {
	712	fwrite(data-64, 1, MCD_SIZE+64, f);
	713	fclose(f);
	714	}
	715	f = fopen(mcd, "r+");
cfa5a2af	716	if (f == NULL) return;
ef79bbde P	717	s = s + 64;
	718	fputc('V', f); s--;
	719	fputc('g', f); s--;
	720	fputc('s', f); s--;
	721	fputc('M', f); s--;
	722	for(i=0;i<3;i++) {
	723	fputc(1, f); s--;
	724	fputc(0, f); s--;
	725	fputc(0, f); s--;
	726	fputc(0, f); s--;
	727	}
	728	fputc(0, f); s--;
	729	fputc(2, f);
	730	while (s-- > (MCD_SIZE+1)) fputc(0, f);
	731	fclose(f);
	732	} else {
	733	f = fopen(mcd, "wb");
	734	if (f != NULL) {
	735	fwrite(data, 1, MCD_SIZE, f);
	736	fclose(f);
	737	}
	738	}
	739	}
	740
	741	void GetMcdBlockInfo(int mcd, int block, McdBlock *Info) {
ab948f7e	742	char data = NULL, ptr, str, sstr;
ef79bbde P	743	unsigned short clut[16];
	744	unsigned short c;
	745	int i, x;
	746
	747	memset(Info, 0, sizeof(McdBlock));
	748
f3a77032	749	if (mcd != 1 && mcd != 2)
	750	return;
	751
	752	if (McdDisable[mcd - 1])
	753	return;
	754
ef79bbde P	755	if (mcd == 1) data = Mcd1Data;
	756	if (mcd == 2) data = Mcd2Data;
	757
	758	ptr = data + block * 8192 + 2;
	759
	760	Info->IconCount = *ptr & 0x3;
	761
	762	ptr += 2;
	763
	764	x = 0;
	765
	766	str = Info->Title;
	767	sstr = Info->sTitle;
	768
	769	for (i = 0; i < 48; i++) {
	770	c = *(ptr) << 8;
	771	c \|= *(ptr + 1);
	772	if (!c) break;
	773
	774	// Convert ASCII characters to half-width
	775	if (c >= 0x8281 && c <= 0x829A)
	776	c = (c - 0x8281) + 'a';
	777	else if (c >= 0x824F && c <= 0x827A)
	778	c = (c - 0x824F) + '0';
	779	else if (c == 0x8140) c = ' ';
	780	else if (c == 0x8143) c = ',';
	781	else if (c == 0x8144) c = '.';
	782	else if (c == 0x8146) c = ':';
	783	else if (c == 0x8147) c = ';';
	784	else if (c == 0x8148) c = '?';
	785	else if (c == 0x8149) c = '!';
	786	else if (c == 0x815E) c = '/';
	787	else if (c == 0x8168) c = '"';
	788	else if (c == 0x8169) c = '(';
	789	else if (c == 0x816A) c = ')';
	790	else if (c == 0x816D) c = '[';
	791	else if (c == 0x816E) c = ']';
	792	else if (c == 0x817C) c = '-';
	793	else {
	794	str[i] = ' ';
	795	sstr[x++] = ptr++; sstr[x++] = ptr++;
	796	continue;
	797	}
	798
	799	str[i] = sstr[x++] = c;
	800	ptr += 2;
	801	}
	802
	803	trim(str);
	804	trim(sstr);
	805
	806	ptr = data + block * 8192 + 0x60; // icon palette data
	807
	808	for (i = 0; i < 16; i++) {
	809	clut[i] = ((unsigned short )ptr);
	810	ptr += 2;
	811	}
	812
	813	for (i = 0; i < Info->IconCount; i++) {
	814	short icon = &Info->Icon[i 16 * 16];
	815
	816	ptr = data + block * 8192 + 128 + 128 * i; // icon data
	817
	818	for (x = 0; x < 16 * 16; x++) {
819	icon[x++] = clut[*ptr & 0xf];
820	icon[x] = clut[*ptr >> 4];
821	ptr++;
822	}
823	}
824
825	ptr = data + block * 128;
826
827	Info->Flags = *ptr;
828
829	ptr += 0xa;
830	strncpy(Info->ID, ptr, 12);
831	ptr += 12;
832	strncpy(Info->Name, ptr, 16);
833	}
834
496d88d4	835	int sioFreeze(void *f, int Mode) {
ef79bbde P	836	gzfreeze(buf, sizeof(buf));
	837	gzfreeze(&StatReg, sizeof(StatReg));
	838	gzfreeze(&ModeReg, sizeof(ModeReg));
	839	gzfreeze(&CtrlReg, sizeof(CtrlReg));
	840	gzfreeze(&BaudReg, sizeof(BaudReg));
	841	gzfreeze(&bufcount, sizeof(bufcount));
	842	gzfreeze(&parp, sizeof(parp));
	843	gzfreeze(&mcdst, sizeof(mcdst));
	844	gzfreeze(&rdwr, sizeof(rdwr));
	845	gzfreeze(&adrH, sizeof(adrH));
	846	gzfreeze(&adrL, sizeof(adrL));
	847	gzfreeze(&padst, sizeof(padst));
	848
	849	return 0;
	850	}