source/src/vm/disk.cpp

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