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