source/src/vm/disk.cpp

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2006.09.16-
   6
   7         [ d88 handler ]
   8 */
   9
  10 #include "disk.h"
  11 #include "../fileio.h"
  12 #if defined(_USE_AGAR) || defined(_USE_SDL)
  13 #include "agar_logger.h"
  14 #endif
  15
  16 // crc table
  17 static const uint16 crc_table[256] = {
  18         0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  19         0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  20         0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  21         0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  22         0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  23         0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  24         0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  25         0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  26         0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  27         0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  28         0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
  29         0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  30         0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
  31         0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
  32         0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
  33         0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
  34 };
  35
  36 // teledisk decoder table
  37 static const uint8 d_code[256] = {
  38         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  39         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  40         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  41         0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
  42         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
  43         0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
  44         0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  45         0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
  46         0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
  47         0x0c, 0x0c, 0x0c, 0x0c, 0x0d, 0x0d, 0x0d, 0x0d, 0x0e, 0x0e, 0x0e, 0x0e, 0x0f, 0x0f, 0x0f, 0x0f,
  48         0x10, 0x10, 0x10, 0x10, 0x11, 0x11, 0x11, 0x11, 0x12, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13, 0x13,
  49         0x14, 0x14, 0x14, 0x14, 0x15, 0x15, 0x15, 0x15, 0x16, 0x16, 0x16, 0x16, 0x17, 0x17, 0x17, 0x17,
  50         0x18, 0x18, 0x19, 0x19, 0x1a, 0x1a, 0x1b, 0x1b, 0x1c, 0x1c, 0x1d, 0x1d, 0x1e, 0x1e, 0x1f, 0x1f,
  51         0x20, 0x20, 0x21, 0x21, 0x22, 0x22, 0x23, 0x23, 0x24, 0x24, 0x25, 0x25, 0x26, 0x26, 0x27, 0x27,
  52         0x28, 0x28, 0x29, 0x29, 0x2a, 0x2a, 0x2b, 0x2b, 0x2c, 0x2c, 0x2d, 0x2d, 0x2e, 0x2e, 0x2f, 0x2f,
  53         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f
  54 };
  55 static const uint8 d_len[256] = {
  56         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
  57         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
  58         0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
  59         0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
  60         0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
  61         0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
  62         0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
  63         0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
  64         0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
  65         0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
  66         0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
  67         0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
  68         0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  69         0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  70         0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  71         0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08
  72 };
  73 static const int secsize[8] = {
  74         128, 256, 512, 1024, 2048, 4096, 8192, 16384
  75 };
  76
  77 static uint8 tmp_buffer[DISK_BUFFER_SIZE];
  78
  79 typedef struct {
  80         int type;
  81         int ncyl, nside, nsec, size;
  82 } fd_format_t;
  83
  84 static const fd_format_t fd_formats[] = {
  85         { MEDIA_TYPE_2D,  40, 1, 16,  256 },    // 1D   160KB
  86         { MEDIA_TYPE_2D , 40, 2, 16,  256 },    // 2D   320KB
  87 #if defined(_MZ80B) || defined(_MZ2000) || defined(_MZ2200) || defined(_MZ2500)
  88         { MEDIA_TYPE_2DD, 80, 2, 16,  256 },    // 2DD  640KB (MZ-2500)
  89 #else
  90         { MEDIA_TYPE_2DD, 80, 2,  8,  512 },    // 2DD  640KB
  91 #endif
  92         { MEDIA_TYPE_2DD, 80, 2,  9,  512 },    // 2DD  720KB
  93         { MEDIA_TYPE_2HD, 80, 2, 15,  512 },    // 2HC 1.20MB
  94         { MEDIA_TYPE_2HD, 77, 2,  8, 1024 },    // 2HD 1.25MB
  95         { MEDIA_TYPE_144, 80, 2, 18,  512 },    // 2HD 1.44MB
  96         { MEDIA_TYPE_144, 80, 2, 36,  512 },    // 2ED 2.88MB
  97         { -1, 0, 0, 0, 0 },
  98 };
  99
 100 void DISK::open(_TCHAR path[], int offset)
 101 {
 102         // check current disk image
 103         if(inserted) {
 104 #if defined(_USE_AGAR) || defined(_USE_SDL)
 105            AGAR_DebugLog(AGAR_LOG_INFO, "Open disk: %s", path);
 106 #endif
 107            if(_tcsicmp(orig_path, path) == 0 && file_offset == offset) {
 108                         return;
 109                 }
 110                 close();
 111         }
 112         memset(buffer, 0, sizeof(buffer));
 113         media_type = MEDIA_TYPE_UNK;
 114         is_standard_image = is_fdi_image = false;
 115 #if defined(_USE_AGAR) || defined(_USE_SDL)
 116         AGAR_DebugLog(AGAR_LOG_INFO, "Open disk: %s", path);
 117 #endif
 118         // open disk image
 119         fi = new FILEIO();
 120         if(fi->Fopen(path, FILEIO_READ_BINARY)) {
 121                 bool converted = false;
 122
 123                 _tcscpy_s(orig_path, _MAX_PATH, path);
 124                 _tcscpy_s(dest_path, _MAX_PATH, path);
 125                 _stprintf_s(temp_path, _MAX_PATH, _T("%s.$$$"), path);
 126                 temporary = false;
 127
 128                 // check if file protected
 129                 write_protected = fi->IsProtected(path);
 130
 131                 // is this d88 format ?
 132                 if(check_file_extension(path, _T(".d88")) || check_file_extension(path, _T(".d77")) ||
 133                    check_file_extension(path, _T(".D88")) || check_file_extension(path, _T(".D77"))) {
 134                         fi->Fseek(offset + 0x1c, FILEIO_SEEK_SET);
 135                         file_size = fi->Fgetc();
 136                         file_size |= fi->Fgetc() << 8;
 137                         file_size |= fi->Fgetc() << 16;
 138                         file_size |= fi->Fgetc() << 24;
 139                         fi->Fseek(offset, FILEIO_SEEK_SET);
 140                         fi->Fread(buffer, file_size, 1);
 141                         file_offset = offset;
 142                         inserted = changed = true;
 143                         goto file_loaded;
 144                 }
 145
 146                 fi->Fseek(0, FILEIO_SEEK_END);
 147                 file_size = fi->Ftell();
 148                 fi->Fseek(0, FILEIO_SEEK_SET);
 149                 file_offset = 0;
 150
 151 #if defined(_X1) || defined(_X1TWIN) || defined(_X1TURBO) || defined(_X1TURBOZ)
 152                 // is this 2d format ?
 153                 if(check_file_extension(path, _T(".2d"))) {
 154                         if(standard_to_d88(MEDIA_TYPE_2D, 40, 2, 16, 256)) {
 155                                 inserted = changed = is_standard_image = true;
 156                                 goto file_loaded;
 157                         }
 158                         fi->Fseek(0, FILEIO_SEEK_SET);
 159                 }
 160 #endif
 161
 162                 // check image file format
 163                 for(int i = 0;; i++) {
 164                         const fd_format_t *p = &fd_formats[i];
 165                         if(p->type == -1) {
 166                                 break;
 167                         }
 168                         int len = p->ncyl * p->nside * p->nsec * p->size;
 169                         // 4096 bytes: FDI header ???
 170                         if(file_size == len || (file_size == (len + 4096) && (len == 655360 || len == 1261568))) {
 171                                 if(file_size == len + 4096) {
 172                                         is_fdi_image = true;
 173                                         fi->Fread(fdi_header, 4096, 1);
 174                                 }
 175                                 if(standard_to_d88(p->type, p->ncyl, p->nside, p->nsec, p->size)) {
 176                                         inserted = changed = is_standard_image = true;
 177                                         goto file_loaded;
 178                                 }
 179                         }
 180                 }
 181                 if(0 < file_size && file_size <= DISK_BUFFER_SIZE) {
 182                         memset(buffer, 0, sizeof(buffer));
 183                         fi->Fread(buffer, file_size, 1);
 184
 185                         // check d88 format (temporary)
 186                         if(*(uint32 *)(buffer + 0x1c) == file_size) {
 187                                 inserted = changed = true;
 188                                 goto file_loaded;
 189                         }
 190                         _stprintf_s(dest_path, _MAX_PATH, _T("%s.D88"), path);
 191
 192                         // check file header
 193                         try {
 194                                 if(memcmp(buffer, "TD", 2) == 0 || memcmp(buffer, "td", 2) == 0) {
 195                                         // teledisk image file
 196                                         inserted = changed = converted = teledisk_to_d88();
 197                                 } else if(memcmp(buffer, "IMD", 3) == 0) {
 198                                         // imagedisk image file
 199                                         inserted = changed = converted = imagedisk_to_d88();
 200                                 } else if(memcmp(buffer, "MV - CPC", 8) == 0) {
 201                                         // standard cpdread image file
 202                                         inserted = changed = converted = cpdread_to_d88(0);
 203                                 } else if(memcmp(buffer, "EXTENDED", 8) == 0) {
 204                                         // extended cpdread image file
 205                                         inserted = changed = converted = cpdread_to_d88(1);
 206                                 }
 207                         }
 208                         catch(...) {
 209                                 // failed to convert the disk image
 210 #if defined(_USE_AGAR) || defined(_USE_SDL)
 211                                 AGAR_DebugLog(AGAR_LOG_INFO, "EE: disk.cpp : Failed to convert disk image.");
 212 #endif
 213                         }
 214                 }
 215 file_loaded:
 216                 if(fi->IsOpened()) {
 217                         fi->Fclose();
 218                 }
 219                 if(temporary) {
 220                         fi->Remove(temp_path);
 221                 }
 222                 if(inserted) {
 223 #if 0
 224                         if(converted) {
 225                                 // write image
 226                                 FILEIO* fio = new FILEIO();
 227                                 if(fio->Fopen(dest_path, FILEIO_WRITE_BINARY)) {
 228                                         fio->Fwrite(buffer, file_size, 1);
 229                                         fio->Fclose();
 230                                 }
 231                                 delete fio;
 232                         }
 233 #endif
 234                         crc32 = getcrc32(buffer, file_size);
 235                 }
 236                 if(buffer[0x1a] != 0) {
 237                         write_protected = true;
 238                 }
 239                 if(media_type == MEDIA_TYPE_UNK) {
 240                         if((media_type = buffer[0x1b]) == MEDIA_TYPE_2HD) {
 241                                 for(int trkside = 0; trkside < 164; trkside++) {
 242                                         uint32 offset = buffer[0x20 + trkside * 4 + 0];
 243                                         offset |= buffer[0x20 + trkside * 4 + 1] << 8;
 244                                         offset |= buffer[0x20 + trkside * 4 + 2] << 16;
 245                                         offset |= buffer[0x20 + trkside * 4 + 3] << 24;
 246
 247                                         if(!offset) {
 248                                                 continue;
 249                                         }
 250                                         // track found
 251                                         uint8 *t = buffer + offset;
 252                                         int sector_num = t[4] | (t[5] << 8);
 253                                         int data_size = t[14] | (t[15] << 8);
 254
 255                                         if(sector_num >= 18 && data_size == 512) {
 256                                                 media_type = MEDIA_TYPE_144;
 257                                         }
 258                                         break;
 259                                 }
 260                         }
 261                 }
 262                 // FIXME: ugly patch for X1turbo ALPHA and Batten Tanuki
 263                 is_alpha = is_batten = false;
 264 #if defined(_X1) || defined(_X1TWIN) || defined(_X1TURBO) || defined(_X1TURBOZ)
 265                 if(media_type == MEDIA_TYPE_2D) {
 266                         static const uint8 batten[] = {0xca, 0xde, 0xaf, 0xc3, 0xdd, 0x20, 0xc0, 0xc7, 0xb7};
 267                         uint32 offset = buffer[0x20] | (buffer[0x21] << 8) | (buffer[0x22] << 16) | (buffer[0x23] << 24);
 268                         uint8 *t = buffer + offset;
 269                         is_alpha = (strncmp((char *)(t + 0x11), "turbo ALPHA", 11) == 0);
 270                         is_batten = (memcmp((void *)(t + 0x11), batten, sizeof(batten)) == 0);
 271                 }
 272 #endif
 273         }
 274         delete fi;
 275 }
 276
 277 void DISK::close()
 278 {
 279         // write disk image
 280         if(inserted) {
 281                 if(!write_protected && file_size && getcrc32(buffer, file_size) != crc32) {
 282                         // write image
 283                         FILEIO* fio = new FILEIO();
 284                         if(fio->Fopen(dest_path, FILEIO_READ_WRITE_BINARY)) {
 285                                 fio->Fseek(file_offset, FILEIO_SEEK_SET);
 286                         } else {
 287                                 _TCHAR tmp_path[_MAX_PATH];
 288                                 _stprintf_s(tmp_path, _MAX_PATH, _T("temporary_saved_floppy_disk_#%d.d88"), drive_num);
 289                                 fio->Fopen(emu->bios_path(tmp_path), FILEIO_WRITE_BINARY);
 290                         }
 291                         if(fio->IsOpened()) {
 292                                 if(is_standard_image) {
 293                                         if(is_fdi_image) {
 294                                                 fio->Fwrite(fdi_header, 4096, 1);
 295                                         }
 296                                         for(int trkside = 0; trkside < 164; trkside++) {
 297                                                 uint32 offset = buffer[0x20 + trkside * 4 + 0];
 298                                                 offset |= buffer[0x20 + trkside * 4 + 1] << 8;
 299                                                 offset |= buffer[0x20 + trkside * 4 + 2] << 16;
 300                                                 offset |= buffer[0x20 + trkside * 4 + 3] << 24;
 301
 302                                                 if(!offset) {
 303                                                         break;
 304                                                 }
 305                                                 uint8* t = buffer + offset;
 306                                                 int sector_num = t[4] | (t[5] << 8);
 307
 308                                                 for(int i = 0; i < sector_num; i++) {
 309                                                         int data_size = t[14] | (t[15] << 8);
 310                                                         fio->Fwrite(t + 0x10, data_size, 1);
 311                                                         t += data_size + 0x10;
 312                                                 }
 313                                         }
 314                                 } else {
 315                                         fio->Fwrite(buffer, file_size, 1);
 316                                 }
 317                                 fio->Fclose();
 318                         }
 319                         delete fio;
 320                 }
 321                 ejected = true;
 322         }
 323         inserted = write_protected = false;
 324         file_size = 0;
 325         sector_size = sector_num = 0;
 326         sector = NULL;
 327 }
 328
 329 bool DISK::insert_sector(uint32 trk, uint32 side, int secnum, uint8 *chrn, uint8 *buf)
 330 {
 331         uint8 *from;
 332         uint8 *to;
 333         int n_size;
 334         int s_size;
 335         int right;
 336
 337         if(secnum < 0) return false;
 338
 339         // This function is not implemented yet.
 340         return true;
 341 }
 342
 343 bool DISK::get_track(int trk, int side)
 344 {
 345         sector_size = sector_num = 0;
 346         no_skew = true;
 347
 348         // disk not inserted or invalid media type
 349         if(!(inserted && check_media_type())) {
 350                 return false;
 351         }
 352
 353         // search track
 354         int trkside = trk * 2 + (side & 1);
 355         if(!(0 <= trkside && trkside < 164)) {
 356                 return false;
 357         }
 358         uint32 offset = buffer[0x20 + trkside * 4 + 0];
 359         offset |= buffer[0x20 + trkside * 4 + 1] << 8;
 360         offset |= buffer[0x20 + trkside * 4 + 2] << 16;
 361         offset |= buffer[0x20 + trkside * 4 + 3] << 24;
 362
 363         if(!offset) {
 364                 return false;
 365         }
 366
 367         // track found
 368         sector = buffer + offset;
 369         sector_num = sector[4] | (sector[5] << 8);
 370
 371         // create each sector position in track
 372         int sync_size  = drive_mfm ? 12 : 6;
 373         int am_size = drive_mfm ? 3 : 0;
 374         int gap2_size = drive_mfm ? 22 : 11;
 375
 376         data_size_shift = 0;
 377         too_many_sectors = false;
 378 retry:
 379         uint8* t = sector;
 380         int total = 0, gap3_size;
 381
 382         for(int i = 0; i < sector_num; i++) {
 383                 int data_size = t[14] | (t[15] << 8);
 384
 385                 if((data_size >> data_size_shift) < 0x80) {
 386                         too_many_sectors = true;
 387                         break;
 388                 }
 389                 total += sync_size + (am_size + 1) + (4 + 2) + gap2_size + sync_size + (am_size + 1);
 390                 total += (data_size >> data_size_shift) + 2;
 391
 392                 t += data_size + 0x10;
 393         }
 394         if(too_many_sectors) {
 395                 // Too many sectors in this track
 396                 gap3_size = 32;
 397                 data_size_shift = 0;
 398         } else if((gap3_size = (get_track_size() - total) / (sector_num + 2)) < 12) {
 399                 // ID:N is modified
 400                 data_size_shift++;
 401                 goto retry;
 402         }
 403         t = sector;
 404         total = gap3_size * 2;
 405
 406         for(int i = 0; i < sector_num; i++) {
 407                 int data_size = t[14] | (t[15] << 8);
 408
 409                 if(too_many_sectors) {
 410                         total = gap3_size * 2 + (get_track_size() - gap3_size * 2) * i / sector_num;
 411                 }
 412                 sync_position[i] = total;
 413                 total += sync_size + (am_size + 1);
 414                 id_position[i] = total;
 415                 total += (4 + 2) + gap2_size + sync_size + (am_size + 1);
 416                 data_position[i] = total;
 417                 total += (data_size >> data_size_shift) + 2 + gap3_size;
 418
 419                 if(t[2] != i + 1) {
 420                         no_skew = false;
 421                 }
 422                 t += data_size + 0x10;
 423         }
 424         return true;
 425 }
 426
 427 bool DISK::make_track(int trk, int side)
 428 {
 429         int track_size = get_track_size();
 430
 431         if(!get_track(trk, side)) {
 432                 // create a dummy track
 433                 for(int i = 0; i < track_size; i++) {
 434                         track[i] = rand();
 435                 }
 436                 return false;
 437         }
 438
 439         // make track image
 440         int sync_size  = drive_mfm ? 12 : 6;
 441         int am_size = drive_mfm ? 3 : 0;
 442         int gap2_size = drive_mfm ? 22 : 11;
 443         uint8 gap_data = drive_mfm ? 0x4e : 0xff;
 444
 445         // preamble
 446         memset(track, gap_data, track_size);
 447
 448         if(sync_position[0] >= (sync_size + am_size + 1) + (8 + 5)) {
 449                 int p = (sync_position[0] - (sync_size + am_size + 1)) * 8 / (8 + 5);
 450
 451                 // sync
 452                 for(int i = 0; i < sync_size; i++) {
 453                         track[p++] = 0x00;
 454                 }
 455                 // index mark
 456                 for(int i = 0; i < am_size; i++) {
 457                         track[p++] = 0xc2;
 458                 }
 459                 track[p++] = 0xfc;
 460         }
 461
 462         // sectors
 463         uint8 *t = sector;
 464
 465         for(int i = 0; i < sector_num; i++) {
 466                 int data_size = t[14] | (t[15] << 8);
 467                 int p = sync_position[i];
 468
 469                 // sync
 470                 for(int j = 0; j < sync_size; j++) {
 471                         if(p < track_size) track[p++] = 0x00;
 472                 }
 473                 // am1
 474                 for(int j = 0; j < am_size; j++) {
 475                         if(p < track_size) track[p++] = 0xa1;
 476                 }
 477                 if(p < track_size) track[p++] = 0xfe;
 478                 // id
 479                 if(p < track_size) track[p++] = t[0];
 480                 if(p < track_size) track[p++] = t[1];
 481                 if(p < track_size) track[p++] = t[2];
 482                 if(p < track_size) track[p++] = t[3];
 483                 uint16 crc = 0;
 484                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0]]);
 485                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[1]]);
 486                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[2]]);
 487                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[3]]);
 488                 if(p < track_size) track[p++] = crc >> 8;
 489                 if(p < track_size) track[p++] = crc & 0xff;
 490                 // gap2
 491                 for(int j = 0; j < gap2_size; j++) {
 492                         if(p < track_size) track[p++] = gap_data;
 493                 }
 494                 // sync
 495                 for(int j = 0; j < sync_size; j++) {
 496                         if(p < track_size) track[p++] = 0x00;
 497                 }
 498                 // am2
 499                 for(int j = 0; j < am_size; j++) {
 500                         if(p < track_size) track[p++] = 0xa1;
 501                 }
 502                 if(p < track_size) track[p++] = (t[7] != 0) ? 0xf8 : 0xfb;
 503                 // data
 504                 crc = 0;
 505                 for(int j = 0; j < (data_size >> data_size_shift); j++) {
 506                         if(p < track_size) track[p++] = t[0x10 + j];
 507                         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0x10 + j]]);
 508                 }
 509                 if(p < track_size) track[p++] = crc >> 8;
 510                 if(p < track_size) track[p++] = crc & 0xff;
 511
 512                 t += data_size + 0x10;
 513         }
 514         return true;
 515 }
 516
 517 bool DISK::get_sector(int trk, int side, int index)
 518 {
 519         sector_size = sector_num = 0;
 520         sector = NULL;
 521
 522         // disk not inserted or invalid media type
 523         if(!(inserted && check_media_type())) {
 524                 return false;
 525         }
 526
 527         // search track
 528         int trkside = trk * 2 + (side & 1);
 529         if(!(0 <= trkside && trkside < 164)) {
 530                 return false;
 531         }
 532         uint32 offset = buffer[0x20 + trkside * 4 + 0];
 533         offset |= buffer[0x20 + trkside * 4 + 1] << 8;
 534         offset |= buffer[0x20 + trkside * 4 + 2] << 16;
 535         offset |= buffer[0x20 + trkside * 4 + 3] << 24;
 536
 537         if(!offset) {
 538                 return false;
 539         }
 540
 541         // track found
 542         uint8* t = buffer + offset;
 543         sector_num = t[4] | (t[5] << 8);
 544
 545         if(index >= sector_num) {
 546                 return false;
 547         }
 548
 549         // skip sector
 550         for(int i = 0; i < index; i++) {
 551                 t += (t[14] | (t[15] << 8)) + 0x10;
 552         }
 553
 554         // header info
 555         id[0] = t[0];
 556         id[1] = t[1];
 557         id[2] = t[2];
 558         id[3] = t[3];
 559         uint16 crc = 0;
 560         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0]]);
 561         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[1]]);
 562         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[2]]);
 563         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[3]]);
 564         id[4] = crc >> 8;
 565         id[5] = crc & 0xff;
 566         density = t[6];
 567         deleted = t[7];
 568         status = t[8];
 569         sector = t + 0x10;
 570         sector_size = t[14] | (t[15] << 8);
 571
 572         return true;
 573 }
 574
 575 int DISK::get_rpm()
 576 {
 577         if(drive_rpm != 0) {
 578                 return drive_rpm;
 579         } else if(inserted) {
 580                 return (media_type == MEDIA_TYPE_2HD) ? 360 : 300;
 581         } else {
 582                 return (drive_type == DRIVE_TYPE_2HD) ? 360 : 300;
 583         }
 584 }
 585
 586 int DISK::get_track_size()
 587 {
 588         if(inserted) {
 589                 return media_type == MEDIA_TYPE_144 ? 12500 : media_type == MEDIA_TYPE_2HD ? 10410 : drive_mfm ? 6250 : 3100;
 590         } else {
 591                 return drive_type == DRIVE_TYPE_144 ? 12500 : drive_type == DRIVE_TYPE_2HD ? 10410 : drive_mfm ? 6250 : 3100;
 592         }
 593 }
 594
 595 double DISK::get_usec_per_bytes(int bytes)
 596 {
 597         return 1000000.0 / (get_track_size() * (get_rpm() / 60.0)) * bytes;
 598 }
 599
 600 bool DISK::check_media_type()
 601 {
 602         switch(drive_type) {
 603         case DRIVE_TYPE_2D:
 604                 return (media_type == MEDIA_TYPE_2D);
 605         case DRIVE_TYPE_2DD:
 606                 return (media_type == MEDIA_TYPE_2D || media_type == MEDIA_TYPE_2DD);
 607         case DRIVE_TYPE_2HD:
 608                 return (media_type == MEDIA_TYPE_2HD);
 609         case DRIVE_TYPE_144:
 610                 return (media_type == MEDIA_TYPE_144);
 611         case DRIVE_TYPE_UNK:
 612                 return true; // always okay
 613         }
 614         return false;
 615 }
 616
 617 // teledisk image decoder
 618
 619 /*
 620         this teledisk image decoder is based on:
 621
 622                 LZHUF.C English version 1.0 based on Japanese version 29-NOV-1988
 623                 LZSS coded by Haruhiko OKUMURA
 624                 Adaptive Huffman Coding coded by Haruyasu YOSHIZAKI
 625                 Edited and translated to English by Kenji RIKITAKE
 626                 TDLZHUF.C by WTK
 627 */
 628
 629 #define COPYBUFFER(src, size) { \
 630         if(file_size + (size) > DISK_BUFFER_SIZE) { \
 631                 return false; \
 632         } \
 633         memcpy(buffer + file_size, (src), (size)); \
 634         file_size += (size); \
 635 }
 636
 637 bool DISK::teledisk_to_d88()
 638 {
 639         td_hdr_t hdr;
 640         td_cmt_t cmt;
 641         td_trk_t trk;
 642         td_sct_t sct;
 643         d88_hdr_t d88_hdr;
 644         d88_sct_t d88_sct;
 645         uint8 obuf[512];
 646
 647         // check teledisk header
 648         fi->Fseek(0, FILEIO_SEEK_SET);
 649         fi->Fread(&hdr, sizeof(td_hdr_t), 1);
 650         if(hdr.sig[0] == 't' && hdr.sig[1] == 'd') {
 651                 // decompress to the temporary file
 652                 FILEIO* fo = new FILEIO();
 653                 if(!fo->Fopen(temp_path, FILEIO_WRITE_BINARY)) {
 654                         delete fo;
 655                         return false;
 656                 }
 657                 int rd = 1;
 658                 init_decode();
 659                 do {
 660                         if((rd = decode(obuf, 512)) > 0) {
 661                                 fo->Fwrite(obuf, rd, 1);
 662                         }
 663                 }
 664                 while(rd > 0);
 665                 fo->Fclose();
 666                 delete fo;
 667                 temporary = true;
 668
 669                 // reopen the temporary file
 670                 fi->Fclose();
 671                 if(!fi->Fopen(temp_path, FILEIO_READ_BINARY)) {
 672                         return false;
 673                 }
 674         }
 675         if(hdr.flag & 0x80) {
 676                 // skip comment
 677                 fi->Fread(&cmt, sizeof(td_cmt_t), 1);
 678                 fi->Fseek(cmt.len, FILEIO_SEEK_CUR);
 679         }
 680
 681         // create d88 image
 682         file_size = 0;
 683
 684         // create d88 header
 685         memset(&d88_hdr, 0, sizeof(d88_hdr_t));
 686         _strcpy_s(d88_hdr.title, sizeof(d88_hdr.title), "TELEDISK");
 687         d88_hdr.protect = 0; // non-protected
 688         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));
 689
 690         // create tracks
 691         int trkcnt = 0, trkptr = sizeof(d88_hdr_t);
 692         fi->Fread(&trk, sizeof(td_trk_t), 1);
 693         while(trk.nsec != 0xff) {
 694                 d88_hdr.trkptr[trkcnt++] = trkptr;
 695                 if(hdr.sides == 1) {
 696                         d88_hdr.trkptr[trkcnt++] = trkptr;
 697                 }
 698
 699                 // read sectors in this track
 700                 for(int i = 0; i < trk.nsec; i++) {
 701                         uint8 buf[2048], dst[2048];
 702                         memset(buf, 0, sizeof(buf));
 703                         memset(dst, 0, sizeof(dst));
 704
 705                         // read sector header
 706                         fi->Fread(&sct, sizeof(td_sct_t), 1);
 707
 708                         // create d88 sector header
 709                         memset(&d88_sct, 0, sizeof(d88_sct_t));
 710                         d88_sct.c = sct.c;
 711                         d88_sct.h = sct.h;
 712                         d88_sct.r = sct.r;
 713                         d88_sct.n = sct.n;
 714                         d88_sct.nsec = trk.nsec;
 715                         d88_sct.dens = (hdr.dens & 0x80) ? 0x40 : 0;
 716                         d88_sct.del = (sct.ctrl & 4) ? 0x10 : 0;
 717                         d88_sct.stat = (sct.ctrl & 2) ? 0x10 : 0; // crc?
 718                         d88_sct.size = secsize[sct.n & 3];
 719
 720                         // create sector image
 721                         if(sct.ctrl != 0x10) {
 722                                 // read sector source
 723                                 int len = fi->Fgetc();
 724                                 len += fi->Fgetc() * 256 - 1;
 725                                 int flag = fi->Fgetc(), d = 0;
 726                                 fi->Fread(buf, len, 1);
 727
 728                                 // convert
 729                                 if(flag == 0) {
 730                                         memcpy(dst, buf, len);
 731                                 } else if(flag == 1) {
 732                                         int len2 = buf[0] | (buf[1] << 8);
 733                                         while(len2--) {
 734                                                 dst[d++] = buf[2];
 735                                                 dst[d++] = buf[3];
 736                                         }
 737                                 } else if(flag == 2) {
 738                                         for(int s = 0; s < len;) {
 739                                                 int type = buf[s++];
 740                                                 int len2 = buf[s++];
 741                                                 if(type == 0) {
 742                                                         while(len2--) {
 743                                                                 dst[d++] = buf[s++];
 744                                                         }
 745                                                 } else if(type < 5) {
 746                                                         uint8 pat[256];
 747                                                         int n = 2;
 748                                                         while(type-- > 1) {
 749                                                                 n *= 2;
 750                                                         }
 751                                                         for(int j = 0; j < n; j++) {
 752                                                                 pat[j] = buf[s++];
 753                                                         }
 754                                                         while(len2--) {
 755                                                                 for(int j = 0; j < n; j++) {
 756                                                                         dst[d++] = pat[j];
 757                                                                 }
 758                                                         }
 759                                                 } else {
 760                                                         break; // unknown type
 761                                                 }
 762                                         }
 763                                 } else {
 764                                         break; // unknown flag
 765                                 }
 766                         } else {
 767                                 d88_sct.size = 0;
 768                         }
 769
 770                         // copy to d88
 771                         COPYBUFFER(&d88_sct, sizeof(d88_sct_t));
 772                         COPYBUFFER(dst, d88_sct.size);
 773                         trkptr += sizeof(d88_sct_t) + d88_sct.size;
 774                 }
 775                 // read next track
 776                 fi->Fread(&trk, sizeof(td_trk_t), 1);
 777         }
 778         d88_hdr.type = ((hdr.dens & 3) == 2) ? MEDIA_TYPE_2HD : ((trkcnt >> 1) > 60) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2D;
 779         d88_hdr.size = trkptr;
 780         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));
 781         return true;
 782 }
 783
 784 int DISK::next_word()
 785 {
 786         if(ibufndx >= ibufcnt) {
 787                 ibufndx = ibufcnt = 0;
 788                 memset(inbuf, 0, 512);
 789                 for(int i = 0; i < 512; i++) {
 790                         int d = fi->Fgetc();
 791                         if(d == EOF) {
 792                                 if(i) {
 793                                         break;
 794                                 }
 795                                 return(-1);
 796                         }
 797                         inbuf[i] = d;
 798                         ibufcnt = i + 1;
 799                 }
 800         }
 801         while(getlen <= 8) {
 802                 getbuf |= inbuf[ibufndx++] << (8 - getlen);
 803                 getlen += 8;
 804         }
 805         return 0;
 806 }
 807
 808 int DISK::get_bit()
 809 {
 810         if(next_word() < 0) {
 811                 return -1;
 812         }
 813         short i = getbuf;
 814         getbuf <<= 1;
 815         getlen--;
 816         return (i < 0) ? 1 : 0;
 817 }
 818
 819 int DISK::get_byte()
 820 {
 821         if(next_word() != 0) {
 822                 return -1;
 823         }
 824         uint16 i = getbuf;
 825         getbuf <<= 8;
 826         getlen -= 8;
 827         i >>= 8;
 828         return (int)i;
 829 }
 830
 831 void DISK::start_huff()
 832 {
 833         int i, j;
 834         for(i = 0; i < N_CHAR; i++) {
 835                 freq[i] = 1;
 836                 son[i] = i + TABLE_SIZE;
 837                 prnt[i + TABLE_SIZE] = i;
 838         }
 839         i = 0; j = N_CHAR;
 840         while(j <= ROOT_POSITION) {
 841                 freq[j] = freq[i] + freq[i + 1];
 842                 son[j] = i;
 843                 prnt[i] = prnt[i + 1] = j;
 844                 i += 2; j++;
 845         }
 846         freq[TABLE_SIZE] = 0xffff;
 847         prnt[ROOT_POSITION] = 0;
 848 }
 849
 850 void DISK::reconst()
 851 {
 852         short i, j = 0, k;
 853         uint16 f, l;
 854         for(i = 0; i < TABLE_SIZE; i++) {
 855                 if(son[i] >= TABLE_SIZE) {
 856                         freq[j] = (freq[i] + 1) / 2;
 857                         son[j] = son[i];
 858                         j++;
 859                 }
 860         }
 861         for(i = 0, j = N_CHAR; j < TABLE_SIZE; i += 2, j++) {
 862                 k = i + 1;
 863                 f = freq[j] = freq[i] + freq[k];
 864                 for(k = j - 1; f < freq[k]; k--);
 865                 k++;
 866                 l = (j - k) * 2;
 867                 memmove(&freq[k + 1], &freq[k], l);
 868                 freq[k] = f;
 869                 memmove(&son[k + 1], &son[k], l);
 870                 son[k] = i;
 871         }
 872         for(i = 0; i < TABLE_SIZE; i++) {
 873                 if((k = son[i]) >= TABLE_SIZE) {
 874                         prnt[k] = i;
 875                 } else {
 876                         prnt[k] = prnt[k + 1] = i;
 877                 }
 878         }
 879 }
 880
 881 void DISK::update(int c)
 882 {
 883         int i, j, k, l;
 884         if(freq[ROOT_POSITION] == MAX_FREQ) {
 885                 reconst();
 886         }
 887         c = prnt[c + TABLE_SIZE];
 888         do {
 889                 k = ++freq[c];
 890                 if(k > freq[l = c + 1]) {
 891                         while(k > freq[++l]);
 892                         l--;
 893                         freq[c] = freq[l];
 894                         freq[l] = k;
 895                         i = son[c];
 896                         prnt[i] = l;
 897                         if(i < TABLE_SIZE) {
 898                                 prnt[i + 1] = l;
 899                         }
 900                         j = son[l];
 901                         son[l] = i;
 902                         prnt[j] = c;
 903                         if(j < TABLE_SIZE) {
 904                                 prnt[j + 1] = c;
 905                         }
 906                         son[c] = j;
 907                         c = l;
 908                 }
 909         }
 910         while((c = prnt[c]) != 0);
 911 }
 912
 913 short DISK::decode_char()
 914 {
 915         int ret;
 916         uint16 c = son[ROOT_POSITION];
 917         while(c < TABLE_SIZE) {
 918                 if((ret = get_bit()) < 0) {
 919                         return -1;
 920                 }
 921                 c += (unsigned)ret;
 922                 c = son[c];
 923         }
 924         c -= TABLE_SIZE;
 925         update(c);
 926         return c;
 927 }
 928
 929 short DISK::decode_position()
 930 {
 931         short bit;
 932         uint16 i, j, c;
 933         if((bit = get_byte()) < 0) {
 934                 return -1;
 935         }
 936         i = (uint16)bit;
 937         c = (uint16)d_code[i] << 6;
 938         j = d_len[i] - 2;
 939         while(j--) {
 940                 if((bit = get_bit()) < 0) {
 941                          return -1;
 942                 }
 943                 i = (i << 1) + bit;
 944         }
 945         return (c | i & 0x3f);
 946 }
 947
 948 void DISK::init_decode()
 949 {
 950         ibufcnt= ibufndx = bufcnt = getbuf = 0;
 951         getlen = 0;
 952         start_huff();
 953         for(int i = 0; i < STRING_BUFFER_SIZE - LOOKAHEAD_BUFFER_SIZE; i++) {
 954                 text_buf[i] = ' ';
 955         }
 956         ptr = STRING_BUFFER_SIZE - LOOKAHEAD_BUFFER_SIZE;
 957 }
 958
 959 int DISK::decode(uint8 *buf, int len)
 960 {
 961         short c, pos;
 962         int  count;
 963         for(count = 0; count < len;) {
 964                 if(bufcnt == 0) {
 965                         if((c = decode_char()) < 0) {
 966                                 return count;
 967                         }
 968                         if(c < 256) {
 969                                 *(buf++) = (uint8)c;
 970                                 text_buf[ptr++] = (uint8)c;
 971                                 ptr &= (STRING_BUFFER_SIZE - 1);
 972                                 count++;
 973                         } else {
 974                                 if((pos = decode_position()) < 0) {
 975                                         return count;
 976                                 }
 977                                 bufpos = (ptr - pos - 1) & (STRING_BUFFER_SIZE - 1);
 978                                 bufcnt = c - 255 + THRESHOLD;
 979                                 bufndx = 0;
 980                         }
 981                 } else {
 982                         while(bufndx < bufcnt && count < len) {
 983                                 c = text_buf[(bufpos + bufndx) & (STRING_BUFFER_SIZE - 1)];
 984                                 *(buf++) = (uint8)c;
 985                                 bufndx++;
 986                                 text_buf[ptr++] = (uint8)c;
 987                                 ptr &= (STRING_BUFFER_SIZE - 1);
 988                                 count++;
 989                         }
 990                         if(bufndx >= bufcnt) {
 991                                 bufndx = bufcnt = 0;
 992                         }
 993                 }
 994         }
 995         return count;
 996 }
 997
 998 // imagedisk image decoder
 999
1000 bool DISK::imagedisk_to_d88()
1001 {
1002         imd_trk_t trk;
1003         d88_hdr_t d88_hdr;
1004         d88_sct_t d88_sct;
1005
1006         // skip comment
1007         fi->Fseek(0, FILEIO_SEEK_SET);
1008         int tmp;
1009         while((tmp = fi->Fgetc()) != 0x1a) {
1010                 if(tmp == EOF) {
1011                         return false;
1012                 }
1013         }
1014
1015         // create d88 image
1016         file_size = 0;
1017
1018         // create d88 header
1019         memset(&d88_hdr, 0, sizeof(d88_hdr_t));
1020         _strcpy_s(d88_hdr.title, sizeof(d88_hdr.title), "IMAGEDISK");
1021         d88_hdr.protect = 0; // non-protected
1022         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));
1023
1024         // create tracks
1025         int trkptr = sizeof(d88_hdr_t);
1026         int trkcnt = 0, mode;
1027
1028         for(int t = 0; t < 164; t++) {
1029                 // check end of file
1030                 if(fi->Fread(&trk, sizeof(imd_trk_t), 1) != 1) {
1031                         break;
1032                 }
1033                 trkcnt = t;
1034
1035                 // check track header
1036                 if(t == 0) {
1037                         mode = trk.mode % 3; // 0=500kbps, 1=300kbps, 2=250kbps
1038                 }
1039                 if(!trk.nsec) {
1040                         continue;
1041                 }
1042                 d88_hdr.trkptr[t] = trkptr;
1043
1044                 // setup sector id
1045                 uint8 c[64], h[64], r[64];
1046                 fi->Fread(r, trk.nsec, 1);
1047                 if(trk.head & 0x80) {
1048                         fi->Fread(c, trk.nsec, 1);
1049                 } else {
1050                         memset(c, trk.cyl, sizeof(c));
1051                 }
1052                 if(trk.head & 0x40) {
1053                         fi->Fread(h, trk.nsec, 1);
1054                 } else {
1055                         memset(h, trk.head & 1, sizeof(h));
1056                 }
1057
1058                 // read sectors in this track
1059                 for(int i = 0; i < trk.nsec; i++) {
1060                         // create d88 sector header
1061                         static const uint8 del[] = {0, 0, 0, 0x10, 0x10, 0, 0, 0x10, 0x10};
1062                         static const uint8 err[] = {0, 0, 0, 0, 0, 0x10, 0x10, 0x10, 0x10};
1063                         int sectype = fi->Fgetc();
1064                         if(sectype > 8) {
1065                                 return false;
1066                         }
1067                         memset(&d88_sct, 0, sizeof(d88_sct_t));
1068                         d88_sct.c = c[i];
1069                         d88_sct.h = h[i];
1070                         d88_sct.r = r[i];
1071                         d88_sct.n = trk.size;
1072                         d88_sct.nsec = trk.nsec;
1073                         d88_sct.dens = (trk.mode < 3) ? 0x40 : 0;
1074                         d88_sct.del = del[sectype];
1075                         d88_sct.stat = err[sectype];
1076                         d88_sct.size = secsize[trk.size & 7];
1077
1078                         // create sector image
1079                         uint8 dst[8192];
1080                         if(sectype == 1 || sectype == 3 || sectype == 5 || sectype == 7) {
1081                                 // uncompressed
1082                                 fi->Fread(dst, d88_sct.size, 1);
1083                         } else if(sectype == 2 || sectype == 4 || sectype == 6 || sectype == 8) {
1084                                 // compressed
1085                                 int tmp = fi->Fgetc();
1086                                 memset(dst, tmp, d88_sct.size);
1087                         } else {
1088                                 d88_sct.size = 0;
1089                         }
1090
1091                         // copy to d88
1092                         COPYBUFFER(&d88_sct, sizeof(d88_sct_t));
1093                         COPYBUFFER(dst, d88_sct.size);
1094                         trkptr += sizeof(d88_sct_t) + d88_sct.size;
1095                 }
1096         }
1097         d88_hdr.type = (mode == 0) ? MEDIA_TYPE_2HD : ((trkcnt >> 1) > 60) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2D;
1098         d88_hdr.size = trkptr;
1099         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));
1100         return true;
1101 }
1102
1103 // cpdread image decoder (from MESS formats/dsk_dsk.c)
1104
1105 bool DISK::cpdread_to_d88(int extended)
1106 {
1107         d88_hdr_t d88_hdr;
1108         d88_sct_t d88_sct;
1109         int total = 0;
1110
1111         // get cylinder number and side number
1112         memcpy(tmp_buffer, buffer, file_size);
1113         int ncyl = tmp_buffer[0x30];
1114         int nside = tmp_buffer[0x31];
1115
1116         // create d88 image
1117         file_size = 0;
1118
1119         // create d88 header
1120         memset(&d88_hdr, 0, sizeof(d88_hdr_t));
1121         _strcpy_s(d88_hdr.title, sizeof(d88_hdr.title), "CPDRead");
1122         d88_hdr.protect = 0; // non-protected
1123         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));
1124
1125         // create tracks
1126         int trkofs = 0x100, trkofs_ptr = 0x34;
1127         int trkptr = sizeof(d88_hdr_t);
1128
1129         for(int c = 0; c < ncyl; c++) {
1130                 for(int h = 0; h < nside; h++) {
1131                         // read sectors in this track
1132                         uint8 *track_info = tmp_buffer + trkofs;
1133                         int cyl = track_info[0x10];
1134                         int side = track_info[0x11];
1135                         int nsec = track_info[0x15];
1136                         int size = 1 << (track_info[0x14] + 7); // standard
1137                         int sctofs = trkofs + 0x100;
1138
1139                         if(nside == 1) {
1140                                 // double side
1141                                 d88_hdr.trkptr[2 * cyl] = d88_hdr.trkptr[2 * cyl + 1] = trkptr;
1142                         } else {
1143                                 d88_hdr.trkptr[2 * cyl + side] = trkptr;
1144                         }
1145                         for(int s = 0; s < nsec; s++) {
1146                                 // get sector size
1147                                 uint8 *sector_info = tmp_buffer + trkofs + 0x18 + s * 8;
1148                                 if(extended) {
1149                                         size = sector_info[6] + sector_info[7] * 256;
1150                                 }
1151
1152                                 // create d88 sector header
1153                                 memset(&d88_sct, 0, sizeof(d88_sct_t));
1154                                 d88_sct.c = sector_info[0];
1155                                 d88_sct.h = sector_info[1];
1156                                 d88_sct.r = sector_info[2];
1157                                 d88_sct.n = sector_info[3];
1158                                 d88_sct.nsec = nsec;
1159                                 d88_sct.dens = 0;
1160                                 d88_sct.del = (sector_info[5] & 0x40) ? 0x10 : 0;
1161                                 d88_sct.stat = 0;
1162                                 d88_sct.size = size;
1163
1164                                 // copy to d88
1165                                 COPYBUFFER(&d88_sct, sizeof(d88_sct_t));
1166                                 COPYBUFFER(tmp_buffer + sctofs, size);
1167                                 trkptr += sizeof(d88_sct_t) + size;
1168                                 sctofs += size;
1169                                 total += size;
1170                         }
1171
1172                         if(extended) {
1173                                 trkofs += tmp_buffer[trkofs_ptr++] * 256;
1174                         } else {
1175                                 trkofs += tmp_buffer[0x32] + tmp_buffer[0x33] * 256;
1176                         }
1177                 }
1178         }
1179         d88_hdr.type = (total < (368640 + 655360) / 2) ? MEDIA_TYPE_2D : (total < (737280 + 1228800) / 2) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2HD;
1180         d88_hdr.size = trkptr;
1181         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));
1182         return true;
1183 }
1184
1185 // standard image decoder
1186
1187 bool DISK::standard_to_d88(int type, int ncyl, int nside, int nsec, int size)
1188 {
1189         d88_hdr_t d88_hdr;
1190         d88_sct_t d88_sct;
1191         int n = 0, t = 0;
1192
1193         file_size = 0;
1194
1195         // create d88 header
1196         memset(&d88_hdr, 0, sizeof(d88_hdr_t));
1197         _strcpy_s(d88_hdr.title, sizeof(d88_hdr.title), "STANDARD");
1198         d88_hdr.protect = 0; // non-protected
1199         d88_hdr.type = (type == MEDIA_TYPE_144) ? MEDIA_TYPE_2HD : type;
1200         media_type = type;
1201         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));
1202
1203         // sector length
1204         for(int i = 0; i < 8; i++) {
1205                 if(size == (128 << i)) {
1206                         n = i;
1207                         break;
1208                 }
1209         }
1210
1211         // create tracks
1212         int trkptr = sizeof(d88_hdr_t);
1213         for(int c = 0; c < ncyl; c++) {
1214                 for(int h = 0; h < nside; h++) {
1215                         d88_hdr.trkptr[t++] = trkptr;
1216                         if(nside == 1) {
1217                                 // double side
1218                                 d88_hdr.trkptr[t++] = trkptr;
1219                         }
1220
1221                         // read sectors in this track
1222                         for(int s = 0; s < nsec; s++) {
1223                                 // create d88 sector header
1224                                 memset(&d88_sct, 0, sizeof(d88_sct_t));
1225                                 d88_sct.c = c;
1226                                 d88_sct.h = h;
1227                                 d88_sct.r = s + 1;
1228                                 d88_sct.n = n;
1229                                 d88_sct.nsec = nsec;
1230                                 d88_sct.dens = 0;
1231                                 d88_sct.del = 0;
1232                                 d88_sct.stat = 0;
1233                                 d88_sct.size = size;
1234
1235                                 // create sector image
1236                                 uint8 dst[16384];
1237                                 memset(dst, 0xe5, sizeof(dst));
1238                                 fi->Fread(dst, size, 1);
1239
1240                                 // copy to d88
1241                                 COPYBUFFER(&d88_sct, sizeof(d88_sct_t));
1242                                 COPYBUFFER(dst, size);
1243                                 trkptr += sizeof(d88_sct_t) + size;
1244                         }
1245                 }
1246         }
1247         d88_hdr.size = trkptr;
1248         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));
1249         return true;
1250 }
1251
1252 #define STATE_VERSION   2
1253
1254 void DISK::save_state(FILEIO* state_fio)
1255 {
1256         state_fio->FputUint32(STATE_VERSION);
1257
1258         state_fio->Fwrite(buffer, sizeof(buffer), 1);
1259         state_fio->Fwrite(orig_path, sizeof(orig_path), 1);
1260         state_fio->Fwrite(dest_path, sizeof(dest_path), 1);
1261         state_fio->FputInt32(file_size);
1262         state_fio->FputInt32(file_offset);
1263         state_fio->FputUint32(crc32);
1264         state_fio->Fwrite(fdi_header, sizeof(fdi_header), 1);
1265         state_fio->FputBool(inserted);
1266         state_fio->FputBool(ejected);
1267         state_fio->FputBool(write_protected);
1268         state_fio->FputBool(changed);
1269         state_fio->FputUint8(media_type);
1270         state_fio->FputBool(is_standard_image);
1271         state_fio->FputBool(is_fdi_image);
1272         state_fio->FputBool(is_alpha);
1273         state_fio->FputBool(is_batten);
1274         state_fio->Fwrite(track, sizeof(track), 1);
1275         state_fio->FputInt32(sector_num);
1276         state_fio->FputInt32(data_size_shift);
1277         state_fio->FputBool(too_many_sectors);
1278         state_fio->FputBool(no_skew);
1279         state_fio->Fwrite(sync_position, sizeof(sync_position), 1);
1280         state_fio->Fwrite(id_position, sizeof(id_position), 1);
1281         state_fio->Fwrite(data_position, sizeof(data_position), 1);
1282         state_fio->FputInt32(sector ? (int)(sector - buffer) : -1);
1283         state_fio->FputInt32(sector_size);
1284         state_fio->Fwrite(id, sizeof(id), 1);
1285         state_fio->FputUint8(density);
1286         state_fio->FputUint8(deleted);
1287         state_fio->FputUint8(status);
1288         state_fio->FputUint8(drive_type);
1289         state_fio->FputInt32(drive_rpm);
1290         state_fio->FputBool(drive_mfm);
1291 }
1292
1293 bool DISK::load_state(FILEIO* state_fio)
1294 {
1295         if(state_fio->FgetUint32() != STATE_VERSION) {
1296                 return false;
1297         }
1298         state_fio->Fread(buffer, sizeof(buffer), 1);
1299         state_fio->Fread(orig_path, sizeof(orig_path), 1);
1300         state_fio->Fread(dest_path, sizeof(dest_path), 1);
1301         file_size = state_fio->FgetInt32();
1302         file_offset = state_fio->FgetInt32();
1303         crc32 = state_fio->FgetUint32();
1304         state_fio->Fread(fdi_header, sizeof(fdi_header), 1);
1305         inserted = state_fio->FgetBool();
1306         ejected = state_fio->FgetBool();
1307         write_protected = state_fio->FgetBool();
1308         changed = state_fio->FgetBool();
1309         media_type = state_fio->FgetUint8();
1310         is_standard_image = state_fio->FgetBool();
1311         is_fdi_image = state_fio->FgetBool();
1312         is_alpha = state_fio->FgetBool();
1313         is_batten = state_fio->FgetBool();
1314         state_fio->Fread(track, sizeof(track), 1);
1315         sector_num = state_fio->FgetInt32();
1316         data_size_shift = state_fio->FgetInt32();
1317         too_many_sectors = state_fio->FgetBool();
1318         no_skew = state_fio->FgetBool();
1319         state_fio->Fread(sync_position, sizeof(sync_position), 1);
1320         state_fio->Fread(id_position, sizeof(id_position), 1);
1321         state_fio->Fread(data_position, sizeof(data_position), 1);
1322         int offset = state_fio->FgetInt32();
1323         sector = (offset != -1) ? buffer + offset : NULL;
1324         sector_size = state_fio->FgetInt32();
1325         state_fio->Fread(id, sizeof(id), 1);
1326         density = state_fio->FgetUint8();
1327         deleted = state_fio->FgetUint8();
1328         status = state_fio->FgetUint8();
1329         drive_type = state_fio->FgetUint8();
1330         drive_rpm = state_fio->FgetInt32();
1331         drive_mfm = state_fio->FgetBool();
1332         return true;
1333 }
1334