libpcsxcore/sio.c

   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
  27 #ifdef USE_LIBRETRO_VFS
  28 #include <streams/file_stream_transforms.h>
  29 #endif
  30
  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];
  55 static unsigned char cardh1[4] = { 0xff, 0x08, 0x5a, 0x5d };
  56 static unsigned char cardh2[4] = { 0xff, 0x08, 0x5a, 0x5d };
  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];
  72 char McdDisable[2];
  73
  74 #define SIO_INT(eCycle) { \
  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); \
  79 }
  80
  81 // clk cycle byte
  82 // 4us * 8bits = (PSXCLK / 1000000) * 32; (linuzappz)
  83 // TODO: add SioModePrescaler and BaudReg
  84 #define SIO_CYCLES              535
  85
  86 void sioWrite8(unsigned char value) {
  87 #ifdef PAD_LOG
  88         PAD_LOG("sio write8 %x\n", value);
  89 #endif
  90         switch (padst) {
  91                 case 1: SIO_INT(SIO_CYCLES);
  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                                 // NegCon - Wipeout 3
 123                                 if( buf[parp] == 0x23 ) {
 124                                         switch (value) {
 125                                                 // enter config mode
 126                                                 case 0x43:
 127                                                         buf[1] = 0x79;
 128                                                         break;
 129
 130                                                 // get status
 131                                                 case 0x45:
 132                                                         buf[1] = 0xf3;
 133                                                         break;
 134                                         }
 135                                 }
 136                         }
 137                         else padst = 0;
 138                         return;
 139                 case 2:
 140                         parp++;
 141 /*                      if (buf[1] == 0x45) {
 142                                 buf[parp] = 0;
 143                                 SIO_INT(SIO_CYCLES);
 144                                 return;
 145                         }*/
 146                         if (!Config.UseNet) {
 147                                 switch (CtrlReg & 0x2002) {
 148                                         case 0x0002: buf[parp] = PAD1_poll(value); break;
 149                                         case 0x2002: buf[parp] = PAD2_poll(value); break;
 150                                 }
 151                         }
 152
 153                         if (parp == bufcount) { padst = 0; return; }
 154                         SIO_INT(SIO_CYCLES);
 155                         return;
 156         }
 157
 158         switch (mcdst) {
 159                 case 1:
 160                         SIO_INT(SIO_CYCLES);
 161                         if (rdwr) { parp++; return; }
 162                         parp = 1;
 163                         switch (value) {
 164                                 case 0x52: rdwr = 1; break;
 165                                 case 0x57: rdwr = 2; break;
 166                                 default: mcdst = 0;
 167                         }
 168                         return;
 169                 case 2: // address H
 170                         SIO_INT(SIO_CYCLES);
 171                         adrH = value;
 172                         *buf = 0;
 173                         parp = 0;
 174                         bufcount = 1;
 175                         mcdst = 3;
 176                         return;
 177                 case 3: // address L
 178                         SIO_INT(SIO_CYCLES);
 179                         adrL = value;
 180                         *buf = adrH;
 181                         parp = 0;
 182                         bufcount = 1;
 183                         mcdst = 4;
 184                         return;
 185                 case 4:
 186                         SIO_INT(SIO_CYCLES);
 187                         parp = 0;
 188                         switch (rdwr) {
 189                                 case 1: // read
 190                                         buf[0] = 0x5c;
 191                                         buf[1] = 0x5d;
 192                                         buf[2] = adrH;
 193                                         buf[3] = adrL;
 194                                         switch (CtrlReg & 0x2002) {
 195                                                 case 0x0002:
 196                                                         memcpy(&buf[4], Mcd1Data + (adrL | (adrH << 8)) * 128, 128);
 197                                                         break;
 198                                                 case 0x2002:
 199                                                         memcpy(&buf[4], Mcd2Data + (adrL | (adrH << 8)) * 128, 128);
 200                                                         break;
 201                                         }
 202                                         {
 203                                         char xor = 0;
 204                                         int i;
 205                                         for (i = 2; i < 128 + 4; i++)
 206                                                 xor ^= buf[i];
 207                                         buf[132] = xor;
 208                                         }
 209                                         buf[133] = 0x47;
 210                                         bufcount = 133;
 211                                         break;
 212                                 case 2: // write
 213                                         buf[0] = adrL;
 214                                         buf[1] = value;
 215                                         buf[129] = 0x5c;
 216                                         buf[130] = 0x5d;
 217                                         buf[131] = 0x47;
 218                                         bufcount = 131;
 219                                         break;
 220                         }
 221                         mcdst = 5;
 222                         return;
 223                 case 5:
 224                         parp++;
 225                         if ((rdwr == 1 && parp == 132) ||
 226                             (rdwr == 2 && parp == 129)) {
 227                                 // clear "new card" flags
 228                                 if (CtrlReg & 0x2000)
 229                                         cardh2[1] &= ~8;
 230                                 else
 231                                         cardh1[1] &= ~8;
 232                         }
 233                         if (rdwr == 2) {
 234                                 if (parp < 128) buf[parp + 1] = value;
 235                         }
 236                         SIO_INT(SIO_CYCLES);
 237                         return;
 238         }
 239
 240         switch (value) {
 241                 case 0x01: // start pad
 242                         StatReg |= RX_RDY;              // Transfer is Ready
 243
 244                         if (!Config.UseNet) {
 245                                 switch (CtrlReg & 0x2002) {
 246                                         case 0x0002: buf[0] = PAD1_startPoll(1); break;
 247                                         case 0x2002: buf[0] = PAD2_startPoll(2); break;
 248                                 }
 249                         } else {
 250                                 if ((CtrlReg & 0x2002) == 0x0002) {
 251                                         int i, j;
 252
 253                                         PAD1_startPoll(1);
 254                                         buf[0] = 0;
 255                                         buf[1] = PAD1_poll(0x42);
 256                                         if (!(buf[1] & 0x0f)) {
 257                                                 bufcount = 32;
 258                                         } else {
 259                                                 bufcount = (buf[1] & 0x0f) * 2;
 260                                         }
 261                                         buf[2] = PAD1_poll(0);
 262                                         i = 3;
 263                                         j = bufcount;
 264                                         while (j--) {
 265                                                 buf[i++] = PAD1_poll(0);
 266                                         }
 267                                         bufcount+= 3;
 268
 269                                         if (NET_sendPadData(buf, bufcount) == -1)
 270                                                 netError();
 271
 272                                         if (NET_recvPadData(buf, 1) == -1)
 273                                                 netError();
 274                                         if (NET_recvPadData(buf + 128, 2) == -1)
 275                                                 netError();
 276                                 } else {
 277                                         memcpy(buf, buf + 128, 32);
 278                                 }
 279                         }
 280
 281                         bufcount = 2;
 282                         parp = 0;
 283                         padst = 1;
 284                         SIO_INT(SIO_CYCLES);
 285                         return;
 286                 case 0x81: // start memcard
 287                         if (CtrlReg & 0x2000)
 288                         {
 289                                 if (McdDisable[1])
 290                                         goto no_device;
 291                                 memcpy(buf, cardh2, 4);
 292                         }
 293                         else
 294                         {
 295                                 if (McdDisable[0])
 296                                         goto no_device;
 297                                 memcpy(buf, cardh1, 4);
 298                         }
 299                         StatReg |= RX_RDY;
 300                         parp = 0;
 301                         bufcount = 3;
 302                         mcdst = 1;
 303                         rdwr = 0;
 304                         SIO_INT(SIO_CYCLES);
 305                         return;
 306                 default:
 307                 no_device:
 308                         StatReg |= RX_RDY;
 309                         buf[0] = 0xff;
 310                         parp = 0;
 311                         bufcount = 0;
 312                         return;
 313         }
 314 }
 315
 316 void sioWriteStat16(unsigned short value) {
 317 }
 318
 319 void sioWriteMode16(unsigned short value) {
 320         ModeReg = value;
 321 }
 322
 323 void sioWriteCtrl16(unsigned short value) {
 324         CtrlReg = value & ~RESET_ERR;
 325         if (value & RESET_ERR) StatReg &= ~IRQ;
 326         if ((CtrlReg & SIO_RESET) || !(CtrlReg & DTR)) {
 327                 padst = 0; mcdst = 0; parp = 0;
 328                 StatReg = TX_RDY | TX_EMPTY;
 329                 psxRegs.interrupt &= ~(1 << PSXINT_SIO);
 330         }
 331 }
 332
 333 void sioWriteBaud16(unsigned short value) {
 334         BaudReg = value;
 335 }
 336
 337 unsigned char sioRead8() {
 338         unsigned char ret = 0;
 339
 340         if ((StatReg & RX_RDY)/* && (CtrlReg & RX_PERM)*/) {
 341 //              StatReg &= ~RX_OVERRUN;
 342                 ret = buf[parp];
 343                 if (parp == bufcount) {
 344                         StatReg &= ~RX_RDY;             // Receive is not Ready now
 345                         if (mcdst == 5) {
 346                                 mcdst = 0;
 347                                 if (rdwr == 2) {
 348                                         switch (CtrlReg & 0x2002) {
 349                                                 case 0x0002:
 350                                                         memcpy(Mcd1Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
 351                                                         SaveMcd(Config.Mcd1, Mcd1Data, (adrL | (adrH << 8)) * 128, 128);
 352                                                         break;
 353                                                 case 0x2002:
 354                                                         memcpy(Mcd2Data + (adrL | (adrH << 8)) * 128, &buf[1], 128);
 355                                                         SaveMcd(Config.Mcd2, Mcd2Data, (adrL | (adrH << 8)) * 128, 128);
 356                                                         break;
 357                                         }
 358                                 }
 359                         }
 360                         if (padst == 2) padst = 0;
 361                         if (mcdst == 1) {
 362                                 mcdst = 2;
 363                                 StatReg|= RX_RDY;
 364                         }
 365                 }
 366         }
 367
 368 #ifdef PAD_LOG
 369         PAD_LOG("sio read8 ;ret = %x\n", ret);
 370 #endif
 371         return ret;
 372 }
 373
 374 unsigned short sioReadStat16() {
 375         return StatReg;
 376 }
 377
 378 unsigned short sioReadMode16() {
 379         return ModeReg;
 380 }
 381
 382 unsigned short sioReadCtrl16() {
 383         return CtrlReg;
 384 }
 385
 386 unsigned short sioReadBaud16() {
 387         return BaudReg;
 388 }
 389
 390 void netError() {
 391         ClosePlugins();
 392         SysMessage(_("Connection closed!\n"));
 393
 394         CdromId[0] = '\0';
 395         CdromLabel[0] = '\0';
 396
 397         SysRunGui();
 398 }
 399
 400 void sioInterrupt() {
 401 #ifdef PAD_LOG
 402         PAD_LOG("Sio Interrupt (CP0.Status = %x)\n", psxRegs.CP0.n.Status);
 403 #endif
 404 //      SysPrintf("Sio Interrupt\n");
 405         if (!(StatReg & IRQ)) {
 406                 StatReg |= IRQ;
 407                 psxHu32ref(0x1070) |= SWAPu32(0x80);
 408         }
 409 }
 410
 411 void LoadMcd(int mcd, char *str) {
 412         FILE *f;
 413         char *data = NULL;
 414
 415         if (mcd != 1 && mcd != 2)
 416                 return;
 417
 418         if (mcd == 1) {
 419                 data = Mcd1Data;
 420                 cardh1[1] |= 8; // mark as new
 421         }
 422         if (mcd == 2) {
 423                 data = Mcd2Data;
 424                 cardh2[1] |= 8;
 425         }
 426
 427         McdDisable[mcd - 1] = 0;
 428 #ifdef HAVE_LIBRETRO
 429         // memcard1 is handled by libretro
 430         if (mcd == 1)
 431                 return;
 432 #endif
 433
 434         if (str == NULL || strcmp(str, "none") == 0) {
 435                 McdDisable[mcd - 1] = 1;
 436                 return;
 437         }
 438         if (*str == 0)
 439                 return;
 440
 441         f = fopen(str, "rb");
 442         if (f == NULL) {
 443                 SysPrintf(_("The memory card %s doesn't exist - creating it\n"), str);
 444                 CreateMcd(str);
 445                 f = fopen(str, "rb");
 446                 if (f != NULL) {
 447                         struct stat buf;
 448
 449                         if (stat(str, &buf) != -1) {
 450                                 if (buf.st_size == MCD_SIZE + 64)
 451                                         fseek(f, 64, SEEK_SET);
 452                                 else if(buf.st_size == MCD_SIZE + 3904)
 453                                         fseek(f, 3904, SEEK_SET);
 454                         }
 455                         if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
 456 #ifndef NDEBUG
 457                                 SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 458 #endif
 459                                 memset(data, 0x00, MCD_SIZE);
 460                         }
 461                         fclose(f);
 462                 }
 463                 else
 464                         SysMessage(_("Memory card %s failed to load!\n"), str);
 465         }
 466         else {
 467                 struct stat buf;
 468                 SysPrintf(_("Loading memory card %s\n"), str);
 469                 if (stat(str, &buf) != -1) {
 470                         if (buf.st_size == MCD_SIZE + 64)
 471                                 fseek(f, 64, SEEK_SET);
 472                         else if(buf.st_size == MCD_SIZE + 3904)
 473                                 fseek(f, 3904, SEEK_SET);
 474                 }
 475                 if (fread(data, 1, MCD_SIZE, f) != MCD_SIZE) {
 476 #ifndef NDEBUG
 477                         SysPrintf(_("File IO error in <%s:%s>.\n"), __FILE__, __func__);
 478 #endif
 479                         memset(data, 0x00, MCD_SIZE);
 480                 }
 481                 fclose(f);
 482         }
 483 }
 484
 485 void LoadMcds(char *mcd1, char *mcd2) {
 486         LoadMcd(1, mcd1);
 487         LoadMcd(2, mcd2);
 488 }
 489
 490 void SaveMcd(char *mcd, char *data, uint32_t adr, int size) {
 491         FILE *f;
 492
 493         if (mcd == NULL || *mcd == 0 || strcmp(mcd, "none") == 0)
 494                 return;
 495
 496         f = fopen(mcd, "r+b");
 497         if (f != NULL) {
 498                 struct stat buf;
 499
 500                 if (stat(mcd, &buf) != -1) {
 501                         if (buf.st_size == MCD_SIZE + 64)
 502                                 fseek(f, adr + 64, SEEK_SET);
 503                         else if (buf.st_size == MCD_SIZE + 3904)
 504                                 fseek(f, adr + 3904, SEEK_SET);
 505                         else
 506                                 fseek(f, adr, SEEK_SET);
 507                 } else
 508                         fseek(f, adr, SEEK_SET);
 509
 510                 fwrite(data + adr, 1, size, f);
 511                 fclose(f);
 512                 return;
 513         }
 514
 515 #if 0
 516         // try to create it again if we can't open it
 517         f = fopen(mcd, "wb");
 518         if (f != NULL) {
 519                 fwrite(data, 1, MCD_SIZE, f);
 520                 fclose(f);
 521         }
 522 #endif
 523
 524         ConvertMcd(mcd, data);
 525 }
 526
 527 void CreateMcd(char *mcd) {
 528         FILE *f;
 529         struct stat buf;
 530         int s = MCD_SIZE;
 531         int i = 0, j;
 532
 533         f = fopen(mcd, "wb");
 534         if (f == NULL)
 535                 return;
 536
 537         if (stat(mcd, &buf) != -1) {
 538                 if ((buf.st_size == MCD_SIZE + 3904) || strstr(mcd, ".gme")) {
 539                         s = s + 3904;
 540                         fputc('1', f);
 541                         s--;
 542                         fputc('2', f);
 543                         s--;
 544                         fputc('3', f);
 545                         s--;
 546                         fputc('-', f);
 547                         s--;
 548                         fputc('4', f);
 549                         s--;
 550                         fputc('5', f);
 551                         s--;
 552                         fputc('6', f);
 553                         s--;
 554                         fputc('-', f);
 555                         s--;
 556                         fputc('S', f);
 557                         s--;
 558                         fputc('T', f);
 559                         s--;
 560                         fputc('D', f);
 561                         s--;
 562                         for (i = 0; i < 7; i++) {
 563                                 fputc(0, f);
 564                                 s--;
 565                         }
 566                         fputc(1, f);
 567                         s--;
 568                         fputc(0, f);
 569                         s--;
 570                         fputc(1, f);
 571                         s--;
 572                         fputc('M', f);
 573                         s--;
 574                         fputc('Q', f);
 575                         s--;
 576                         for (i = 0; i < 14; i++) {
 577                                 fputc(0xa0, f);
 578                                 s--;
 579                         }
 580                         fputc(0, f);
 581                         s--;
 582                         fputc(0xff, f);
 583                         while (s-- > (MCD_SIZE + 1))
 584                                 fputc(0, f);
 585                 } else if ((buf.st_size == MCD_SIZE + 64) || strstr(mcd, ".mem") || strstr(mcd, ".vgs")) {
 586                         s = s + 64;
 587                         fputc('V', f);
 588                         s--;
 589                         fputc('g', f);
 590                         s--;
 591                         fputc('s', f);
 592                         s--;
 593                         fputc('M', f);
 594                         s--;
 595                         for (i = 0; i < 3; i++) {
 596                                 fputc(1, f);
 597                                 s--;
 598                                 fputc(0, f);
 599                                 s--;
 600                                 fputc(0, f);
 601                                 s--;
 602                                 fputc(0, f);
 603                                 s--;
 604                         }
 605                         fputc(0, f);
 606                         s--;
 607                         fputc(2, f);
 608                         while (s-- > (MCD_SIZE + 1))
 609                                 fputc(0, f);
 610                 }
 611         }
 612         fputc('M', f);
 613         s--;
 614         fputc('C', f);
 615         s--;
 616         while (s-- > (MCD_SIZE - 127))
 617                 fputc(0, f);
 618         fputc(0xe, f);
 619         s--;
 620
 621         for (i = 0; i < 15; i++) { // 15 blocks
 622                 fputc(0xa0, f);
 623                 s--;
 624                 fputc(0x00, f);
 625                 s--;
 626                 fputc(0x00, f);
 627                 s--;
 628                 fputc(0x00, f);
 629                 s--;
 630                 fputc(0x00, f);
 631                 s--;
 632                 fputc(0x00, f);
 633                 s--;
 634                 fputc(0x00, f);
 635                 s--;
 636                 fputc(0x00, f);
 637                 s--;
 638                 fputc(0xff, f);
 639                 s--;
 640                 fputc(0xff, f);
 641                 s--;
 642                 for (j = 0; j < 117; j++) {
 643                         fputc(0x00, f);
 644                         s--;
 645                 }
 646                 fputc(0xa0, f);
 647                 s--;
 648         }
 649
 650         for (i = 0; i < 20; i++) {
 651                 fputc(0xff, f);
 652                 s--;
 653                 fputc(0xff, f);
 654                 s--;
 655                 fputc(0xff, f);
 656                 s--;
 657                 fputc(0xff, f);
 658                 s--;
 659                 fputc(0x00, f);
 660                 s--;
 661                 fputc(0x00, f);
 662                 s--;
 663                 fputc(0x00, f);
 664                 s--;
 665                 fputc(0x00, f);
 666                 s--;
 667                 fputc(0xff, f);
 668                 s--;
 669                 fputc(0xff, f);
 670                 s--;
 671                 for (j = 0; j < 118; j++) {
 672                         fputc(0x00, f);
 673                         s--;
 674                 }
 675         }
 676
 677         while ((s--) >= 0)
 678                 fputc(0, f);
 679
 680         fclose(f);
 681 }
 682
 683 void ConvertMcd(char *mcd, char *data) {
 684         FILE *f;
 685         int i = 0;
 686         int s = MCD_SIZE;
 687
 688         if (strstr(mcd, ".gme")) {
 689                 f = fopen(mcd, "wb");
 690                 if (f != NULL) {
 691                         fwrite(data - 3904, 1, MCD_SIZE + 3904, f);
 692                         fclose(f);
 693                 }
 694                 f = fopen(mcd, "r+");
 695                 if (f == NULL) return;
 696                 s = s + 3904;
 697                 fputc('1', f); s--;
 698                 fputc('2', f); s--;
 699                 fputc('3', f); s--;
 700                 fputc('-', f); s--;
 701                 fputc('4', f); s--;
 702                 fputc('5', f); s--;
 703                 fputc('6', f); s--;
 704                 fputc('-', f); s--;
 705                 fputc('S', f); s--;
 706                 fputc('T', f); s--;
 707                 fputc('D', f); s--;
 708                 for (i = 0; i < 7; i++) {
 709                         fputc(0, f); s--;
 710                 }
 711                 fputc(1, f); s--;
 712                 fputc(0, f); s--;
 713                 fputc(1, f); s--;
 714                 fputc('M', f); s--;
 715                 fputc('Q', f); s--;
 716                 for(i=0;i<14;i++) {
 717                         fputc(0xa0, f); s--;
 718                 }
 719                 fputc(0, f); s--;
 720                 fputc(0xff, f);
 721                 while (s-- > (MCD_SIZE+1)) fputc(0, f);
 722                 fclose(f);
 723         } else if(strstr(mcd, ".mem") || strstr(mcd,".vgs")) {
 724                 f = fopen(mcd, "wb");
 725                 if (f != NULL) {
 726                         fwrite(data-64, 1, MCD_SIZE+64, f);
 727                         fclose(f);
 728                 }
 729                 f = fopen(mcd, "r+");
 730                 if (f == NULL) return;
 731                 s = s + 64;
 732                 fputc('V', f); s--;
 733                 fputc('g', f); s--;
 734                 fputc('s', f); s--;
 735                 fputc('M', f); s--;
 736                 for(i=0;i<3;i++) {
 737                         fputc(1, f); s--;
 738                         fputc(0, f); s--;
 739                         fputc(0, f); s--;
 740                         fputc(0, f); s--;
 741                 }
 742                 fputc(0, f); s--;
 743                 fputc(2, f);
 744                 while (s-- > (MCD_SIZE+1)) fputc(0, f);
 745                 fclose(f);
 746         } else {
 747                 f = fopen(mcd, "wb");
 748                 if (f != NULL) {
 749                         fwrite(data, 1, MCD_SIZE, f);
 750                         fclose(f);
 751                 }
 752         }
 753 }
 754
 755 void GetMcdBlockInfo(int mcd, int block, McdBlock *Info) {
 756         char *data = NULL, *ptr, *str, *sstr;
 757         unsigned short clut[16];
 758         unsigned short c;
 759         int i, x;
 760
 761         memset(Info, 0, sizeof(McdBlock));
 762
 763         if (mcd != 1 && mcd != 2)
 764                 return;
 765
 766         if (McdDisable[mcd - 1])
 767                 return;
 768
 769         if (mcd == 1) data = Mcd1Data;
 770         if (mcd == 2) data = Mcd2Data;
 771
 772         ptr = data + block * 8192 + 2;
 773
 774         Info->IconCount = *ptr & 0x3;
 775
 776         ptr += 2;
 777
 778         x = 0;
 779
 780         str = Info->Title;
 781         sstr = Info->sTitle;
 782
 783         for (i = 0; i < 48; i++) {
 784                 c = *(ptr) << 8;
 785                 c |= *(ptr + 1);
 786                 if (!c) break;
 787
 788                 // Convert ASCII characters to half-width
 789                 if (c >= 0x8281 && c <= 0x829A)
 790                         c = (c - 0x8281) + 'a';
 791                 else if (c >= 0x824F && c <= 0x827A)
 792                         c = (c - 0x824F) + '0';
 793                 else if (c == 0x8140) c = ' ';
 794                 else if (c == 0x8143) c = ',';
 795                 else if (c == 0x8144) c = '.';
 796                 else if (c == 0x8146) c = ':';
 797                 else if (c == 0x8147) c = ';';
 798                 else if (c == 0x8148) c = '?';
 799                 else if (c == 0x8149) c = '!';
 800                 else if (c == 0x815E) c = '/';
 801                 else if (c == 0x8168) c = '"';
 802                 else if (c == 0x8169) c = '(';
 803                 else if (c == 0x816A) c = ')';
 804                 else if (c == 0x816D) c = '[';
 805                 else if (c == 0x816E) c = ']';
 806                 else if (c == 0x817C) c = '-';
 807                 else {
 808                         str[i] = ' ';
 809                         sstr[x++] = *ptr++; sstr[x++] = *ptr++;
 810                         continue;
 811                 }
 812
 813                 str[i] = sstr[x++] = c;
 814                 ptr += 2;
 815         }
 816
 817         trim(str);
 818         trim(sstr);
 819
 820         ptr = data + block * 8192 + 0x60; // icon palette data
 821
 822         for (i = 0; i < 16; i++) {
 823                 clut[i] = *((unsigned short *)ptr);
 824                 ptr += 2;
 825         }
 826
 827         for (i = 0; i < Info->IconCount; i++) {
 828                 short *icon = &Info->Icon[i * 16 * 16];
 829
 830                 ptr = data + block * 8192 + 128 + 128 * i; // icon data
 831
 832                 for (x = 0; x < 16 * 16; x++) {
 833                         icon[x++] = clut[*ptr & 0xf];
 834                         icon[x] = clut[*ptr >> 4];
 835                         ptr++;
 836                 }
 837         }
 838
 839         ptr = data + block * 128;
 840
 841         Info->Flags = *ptr;
 842
 843         ptr += 0xa;
 844         strncpy(Info->ID, ptr, 12);
 845         ptr += 12;
 846         strncpy(Info->Name, ptr, 16);
 847 }
 848
 849 int sioFreeze(void *f, int Mode) {
 850         gzfreeze(buf, sizeof(buf));
 851         gzfreeze(&StatReg, sizeof(StatReg));
 852         gzfreeze(&ModeReg, sizeof(ModeReg));
 853         gzfreeze(&CtrlReg, sizeof(CtrlReg));
 854         gzfreeze(&BaudReg, sizeof(BaudReg));
 855         gzfreeze(&bufcount, sizeof(bufcount));
 856         gzfreeze(&parp, sizeof(parp));
 857         gzfreeze(&mcdst, sizeof(mcdst));
 858         gzfreeze(&rdwr, sizeof(rdwr));
 859         gzfreeze(&adrH, sizeof(adrH));
 860         gzfreeze(&adrL, sizeof(adrL));
 861         gzfreeze(&padst, sizeof(padst));
 862
 863         return 0;
 864 }