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            printf("Open disk: %s\n", path);\r
 120                 if(_tcsicmp(orig_path, path) == 0 && file_offset == offset) {\r
 121                         return;\r
 122                 }\r
 123                 close();\r
 124         }\r
 125         memset(buffer, 0, sizeof(buffer));\r
 126         media_type = MEDIA_TYPE_UNK;\r
 127         is_standard_image = is_fdi_image = false;\r
 128         printf("Open disk: %s\n", path);\r
 129         \r
 130         // open disk image\r
 131         fi = new FILEIO();\r
 132         if(fi->Fopen(path, FILEIO_READ_BINARY)) {\r
 133                 bool converted = false;\r
 134                 \r
 135                 _tcscpy(orig_path, path);\r
 136                 _tcscpy(dest_path, path);\r
 137                 _stprintf(temp_path, _T("%s.$$$"), path);\r
 138                 temporary = false;\r
 139                 \r
 140                 // check if file protected\r
 141                 write_protected = fi->IsProtected(path);\r
 142                 \r
 143                 // is this d88 format ?\r
 144                 if(check_file_extension(path, _T(".d88")) || check_file_extension(path, _T(".d77"))) {\r
 145                         fi->Fseek(offset + 0x1c, FILEIO_SEEK_SET);\r
 146                         file_size = fi->Fgetc();\r
 147                         file_size |= fi->Fgetc() << 8;\r
 148                         file_size |= fi->Fgetc() << 16;\r
 149                         file_size |= fi->Fgetc() << 24;\r
 150                         fi->Fseek(offset, FILEIO_SEEK_SET);\r
 151                         fi->Fread(buffer, file_size, 1);\r
 152                         file_offset = offset;\r
 153                         inserted = changed = true;\r
 154                         goto file_loaded;\r
 155                 }\r
 156                 \r
 157                 fi->Fseek(0, FILEIO_SEEK_END);\r
 158                 file_size = fi->Ftell();\r
 159                 fi->Fseek(0, FILEIO_SEEK_SET);\r
 160                 file_offset = 0;\r
 161                 \r
 162 #if defined(_X1) || defined(_X1TWIN) || defined(_X1TURBO) || defined(_X1TURBOZ)\r
 163                 // is this 2d format ?\r
 164                 if(check_file_extension(path, _T(".2d"))) {\r
 165                         if(standard_to_d88(MEDIA_TYPE_2D, 40, 2, 16, 256)) {\r
 166                                 inserted = changed = is_standard_image = true;\r
 167                                 goto file_loaded;\r
 168                         }\r
 169                         fi->Fseek(0, FILEIO_SEEK_SET);\r
 170                 }\r
 171 #endif\r
 172                 \r
 173                 // check image file format\r
 174                 for(int i = 0;; i++) {\r
 175                         const fd_format *p = &fd_formats[i];\r
 176                         if(p->type == -1) {\r
 177                                 break;\r
 178                         }\r
 179                         int len = p->ncyl * p->nside * p->nsec * p->size;\r
 180                         // 4096 bytes: FDI header ???\r
 181                         if(file_size == len || (file_size == (len + 4096) && (len == 655360 || len == 1261568))) {\r
 182                                 if(file_size == len + 4096) {\r
 183                                         is_fdi_image = true;\r
 184                                         fi->Fread(fdi_header, 4096, 1);\r
 185                                 }\r
 186                                 if(standard_to_d88(p->type, p->ncyl, p->nside, p->nsec, p->size)) {\r
 187                                         inserted = changed = is_standard_image = true;\r
 188                                         goto file_loaded;\r
 189                                 }\r
 190                         }\r
 191                 }\r
 192                 if(0 < file_size && file_size <= DISK_BUFFER_SIZE) {\r
 193                         memset(buffer, 0, sizeof(buffer));\r
 194                         fi->Fread(buffer, file_size, 1);\r
 195                         \r
 196                         // check d88 format (temporary)\r
 197                         if(*(uint32 *)(buffer + 0x1c) == file_size) {\r
 198                                 inserted = changed = true;\r
 199                                 goto file_loaded;\r
 200                         }\r
 201                         _stprintf(dest_path, _T("%s.D88"), path);\r
 202                         \r
 203                         // check file header\r
 204                         try {\r
 205                                 if(memcmp(buffer, "TD", 2) == 0 || memcmp(buffer, "td", 2) == 0) {\r
 206                                         // teledisk image file\r
 207                                         inserted = changed = converted = teledisk_to_d88();\r
 208                                 } else if(memcmp(buffer, "IMD", 3) == 0) {\r
 209                                         // imagedisk image file\r
 210                                         inserted = changed = converted = imagedisk_to_d88();\r
 211                                 } else if(memcmp(buffer, "MV - CPC", 8) == 0) {\r
 212                                         // standard cpdread image file\r
 213                                         inserted = changed = converted = cpdread_to_d88(0);\r
 214                                 } else if(memcmp(buffer, "EXTENDED", 8) == 0) {\r
 215                                         // extended cpdread image file\r
 216                                         inserted = changed = converted = cpdread_to_d88(1);\r
 217                                 }\r
 218                         }\r
 219                         catch(...) {\r
 220                                 // failed to convert the disk image\r
 221                                 printf("EE: disk.cpp : Failed to convert disk image.\n");\r
 222                         }\r
 223                 }\r
 224 file_loaded:\r
 225                 if(fi->IsOpened()) {\r
 226                         fi->Fclose();\r
 227                 }\r
 228                 if(temporary) {\r
 229                         fi->Remove(temp_path);\r
 230                 }\r
 231                 if(inserted) {\r
 232 #if 0\r
 233                         if(converted) {\r
 234                                 // write image\r
 235                                 FILEIO* fio = new FILEIO();\r
 236                                 if(fio->Fopen(dest_path, FILEIO_WRITE_BINARY)) {\r
 237                                         fio->Fwrite(buffer, file_size, 1);\r
 238                                         fio->Fclose();\r
 239                                 }\r
 240                                 delete fio;\r
 241                         }\r
 242 #endif\r
 243                         crc32 = getcrc32(buffer, file_size);\r
 244                 }\r
 245                 if(buffer[0x1a] != 0) {\r
 246                         write_protected = true;\r
 247                 }\r
 248                 if(media_type == MEDIA_TYPE_UNK) {\r
 249                         if((media_type = buffer[0x1b]) == MEDIA_TYPE_2HD) {\r
 250                                 for(int trkside = 0; trkside < 164; trkside++) {\r
 251                                         uint32 offset = buffer[0x20 + trkside * 4 + 0];\r
 252                                         offset |= buffer[0x20 + trkside * 4 + 1] << 8;\r
 253                                         offset |= buffer[0x20 + trkside * 4 + 2] << 16;\r
 254                                         offset |= buffer[0x20 + trkside * 4 + 3] << 24;\r
 255                                         \r
 256                                         if(!offset) {\r
 257                                                 continue;\r
 258                                         }\r
 259                                         // track found\r
 260                                         uint8 *t = buffer + offset;\r
 261                                         int sector_num = t[4] | (t[5] << 8);\r
 262                                         int data_size = t[14] | (t[15] << 8);\r
 263                                         \r
 264                                         if(sector_num >= 18 && data_size == 512) {\r
 265                                                 media_type = MEDIA_TYPE_144;\r
 266                                         }\r
 267                                         break;\r
 268                                 }\r
 269                         }\r
 270                 }\r
 271                 // FIXME: ugly patch for X1turbo ALPHA and ARCUS\r
 272                 is_alpha = false;\r
 273 #if defined(_X1TURBO) || defined(_X1TURBOZ)\r
 274                 if(media_type == MEDIA_TYPE_2D) {\r
 275                         uint32 offset = buffer[0x20] | (buffer[0x21] << 8) | (buffer[0x22] << 16) | (buffer[0x23] << 24);\r
 276                         uint8 *t = buffer + offset;\r
 277                         is_alpha = (strncmp((char *)(t + 0x11), "turbo ALPHA", 11) == 0);\r
 278                 }\r
 279 #endif\r
 280         }\r
 281         delete fi;\r
 282 }\r
 283 \r
 284 void DISK::close()\r
 285 {\r
 286         // write disk image\r
 287         if(inserted) {\r
 288                 if(!write_protected && file_size && getcrc32(buffer, file_size) != crc32) {\r
 289                         // write image\r
 290                         FILEIO* fio = new FILEIO();\r
 291                         if(fio->Fopen(dest_path, FILEIO_READ_WRITE_BINARY)) {\r
 292                                 fio->Fseek(file_offset, FILEIO_SEEK_SET);\r
 293                         } else {\r
 294                                 fio->Fopen(dest_path, FILEIO_WRITE_BINARY);\r
 295                         }\r
 296                         if(fio->IsOpened()) {\r
 297                                 if(is_standard_image) {\r
 298                                         if(is_fdi_image) {\r
 299                                                 fio->Fwrite(fdi_header, 4096, 1);\r
 300                                         }\r
 301                                         for(int trkside = 0; trkside < 164; trkside++) {\r
 302                                                 uint32 offset = buffer[0x20 + trkside * 4 + 0];\r
 303                                                 offset |= buffer[0x20 + trkside * 4 + 1] << 8;\r
 304                                                 offset |= buffer[0x20 + trkside * 4 + 2] << 16;\r
 305                                                 offset |= buffer[0x20 + trkside * 4 + 3] << 24;\r
 306                                                 \r
 307                                                 if(!offset) {\r
 308                                                         break;\r
 309                                                 }\r
 310                                                 uint8* t = buffer + offset;\r
 311                                                 int sector_num = t[4] | (t[5] << 8);\r
 312                                                 \r
 313                                                 for(int i = 0; i < sector_num; i++) {\r
 314                                                         int data_size = t[14] | (t[15] << 8);\r
 315                                                         fio->Fwrite(t + 0x10, data_size, 1);\r
 316                                                         t += data_size + 0x10;\r
 317                                                 }\r
 318                                         }\r
 319                                 } else {\r
 320                                         fio->Fwrite(buffer, file_size, 1);\r
 321                                 }\r
 322                                 fio->Fclose();\r
 323                         }\r
 324                         delete fio;\r
 325                 }\r
 326                 ejected = true;\r
 327         }\r
 328         inserted = write_protected = false;\r
 329         file_size = 0;\r
 330         sector_size = sector_num = 0;\r
 331         sector = NULL;\r
 332 }\r
 333 \r
 334 bool DISK::get_track(int trk, int side)\r
 335 {\r
 336         sector_size = sector_num = 0;\r
 337         no_skew = true;\r
 338         \r
 339         // disk not inserted or invalid media type\r
 340         if(!(inserted && check_media_type())) {\r
 341                 return false;\r
 342         }\r
 343         \r
 344         // search track\r
 345         int trkside = trk * 2 + (side & 1);\r
 346         if(!(0 <= trkside && trkside < 164)) {\r
 347                 return false;\r
 348         }\r
 349         uint32 offset = buffer[0x20 + trkside * 4 + 0];\r
 350         offset |= buffer[0x20 + trkside * 4 + 1] << 8;\r
 351         offset |= buffer[0x20 + trkside * 4 + 2] << 16;\r
 352         offset |= buffer[0x20 + trkside * 4 + 3] << 24;\r
 353         \r
 354         if(!offset) {\r
 355                 return false;\r
 356         }\r
 357         \r
 358         // track found\r
 359         sector = buffer + offset;\r
 360         sector_num = sector[4] | (sector[5] << 8);\r
 361         \r
 362         // create each sector position in track\r
 363         int sync_size  = drive_mfm ? 12 : 6;\r
 364         int am_size = drive_mfm ? 3 : 0;\r
 365         int gap2_size = drive_mfm ? 22 : 11;\r
 366         \r
 367         data_size_shift = 0;\r
 368         too_many_sectors = false;\r
 369 retry:\r
 370         uint8* t = sector;\r
 371         int total = 0, gap3_size;\r
 372         \r
 373         for(int i = 0; i < sector_num; i++) {\r
 374                 int data_size = t[14] | (t[15] << 8);\r
 375                 \r
 376                 if((data_size >> data_size_shift) < 0x80) {\r
 377                         too_many_sectors = true;\r
 378                         break;\r
 379                 }\r
 380                 total += sync_size + (am_size + 1) + (4 + 2) + gap2_size + sync_size + (am_size + 1);\r
 381                 total += (data_size >> data_size_shift) + 2;\r
 382                 \r
 383                 t += data_size + 0x10;\r
 384         }\r
 385         if(too_many_sectors) {\r
 386                 // Too many sectors in this track\r
 387                 gap3_size = 32;\r
 388                 data_size_shift = 0;\r
 389         } else if((gap3_size = (get_track_size() - total) / (sector_num + 2)) < 12) {\r
 390                 // ID:N is modified\r
 391                 data_size_shift++;\r
 392                 goto retry;\r
 393         }\r
 394         t = sector;\r
 395         total = gap3_size * 2;\r
 396         \r
 397         for(int i = 0; i < sector_num; i++) {\r
 398                 int data_size = t[14] | (t[15] << 8);\r
 399                 \r
 400                 if(too_many_sectors) {\r
 401                         total = gap3_size * 2 + (get_track_size() - gap3_size * 2) * i / sector_num;\r
 402                 }\r
 403                 sync_position[i] = total;\r
 404                 total += sync_size + (am_size + 1);\r
 405                 id_position[i] = total;\r
 406                 total += (4 + 2) + gap2_size + sync_size + (am_size + 1);\r
 407                 data_position[i] = total;\r
 408                 total += (data_size >> data_size_shift) + 2 + gap3_size;\r
 409                 \r
 410                 if(t[2] != i + 1) {\r
 411                         no_skew = false;\r
 412                 }\r
 413                 t += data_size + 0x10;\r
 414         }\r
 415         return true;\r
 416 }\r
 417 \r
 418 bool DISK::make_track(int trk, int side)\r
 419 {\r
 420         int track_size = get_track_size();\r
 421         \r
 422         if(!get_track(trk, side)) {\r
 423                 // create a dummy track\r
 424                 for(int i = 0; i < track_size; i++) {\r
 425                         track[i] = rand();\r
 426                 }\r
 427                 return false;\r
 428         }\r
 429         \r
 430         // make track image\r
 431         int sync_size  = drive_mfm ? 12 : 6;\r
 432         int am_size = drive_mfm ? 3 : 0;\r
 433         int gap2_size = drive_mfm ? 22 : 11;\r
 434         uint8 gap_data = drive_mfm ? 0x4e : 0xff;\r
 435         \r
 436         // preamble\r
 437         memset(track, gap_data, track_size);\r
 438         \r
 439         if(sync_position[0] >= (sync_size + am_size + 1) + (8 + 5)) {\r
 440                 int p = (sync_position[0] - (sync_size + am_size + 1)) * 8 / (8 + 5);\r
 441                 \r
 442                 // sync\r
 443                 for(int i = 0; i < sync_size; i++) {\r
 444                         track[p++] = 0x00;\r
 445                 }\r
 446                 // index mark\r
 447                 for(int i = 0; i < am_size; i++) {\r
 448                         track[p++] = 0xc2;\r
 449                 }\r
 450                 track[p++] = 0xfc;\r
 451         }\r
 452         \r
 453         // sectors\r
 454         uint8 *t = sector;\r
 455         \r
 456         for(int i = 0; i < sector_num; i++) {\r
 457                 int data_size = t[14] | (t[15] << 8);\r
 458                 int p = sync_position[i];\r
 459                 \r
 460                 // sync\r
 461                 for(int j = 0; j < sync_size; j++) {\r
 462                         if(p < track_size) track[p++] = 0x00;\r
 463                 }\r
 464                 // am1\r
 465                 for(int j = 0; j < am_size; j++) {\r
 466                         if(p < track_size) track[p++] = 0xa1;\r
 467                 }\r
 468                 if(p < track_size) track[p++] = 0xfe;\r
 469                 // id\r
 470                 if(p < track_size) track[p++] = t[0];\r
 471                 if(p < track_size) track[p++] = t[1];\r
 472                 if(p < track_size) track[p++] = t[2];\r
 473                 if(p < track_size) track[p++] = t[3];\r
 474                 uint16 crc = 0;\r
 475                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0]]);\r
 476                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[1]]);\r
 477                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[2]]);\r
 478                 crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[3]]);\r
 479                 if(p < track_size) track[p++] = crc >> 8;\r
 480                 if(p < track_size) track[p++] = crc & 0xff;\r
 481                 // gap2\r
 482                 for(int j = 0; j < gap2_size; j++) {\r
 483                         if(p < track_size) track[p++] = gap_data;\r
 484                 }\r
 485                 // sync\r
 486                 for(int j = 0; j < sync_size; j++) {\r
 487                         if(p < track_size) track[p++] = 0x00;\r
 488                 }\r
 489                 // am2\r
 490                 for(int j = 0; j < am_size; j++) {\r
 491                         if(p < track_size) track[p++] = 0xa1;\r
 492                 }\r
 493                 if(p < track_size) track[p++] = (t[7] != 0) ? 0xf8 : 0xfb;\r
 494                 // data\r
 495                 crc = 0;\r
 496                 for(int j = 0; j < (data_size >> data_size_shift); j++) {\r
 497                         if(p < track_size) track[p++] = t[0x10 + j];\r
 498                         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0x10 + j]]);\r
 499                 }\r
 500                 if(p < track_size) track[p++] = crc >> 8;\r
 501                 if(p < track_size) track[p++] = crc & 0xff;\r
 502                 \r
 503                 t += data_size + 0x10;\r
 504         }\r
 505         return true;\r
 506 }\r
 507 \r
 508 bool DISK::get_sector(int trk, int side, int index)\r
 509 {\r
 510         sector_size = sector_num = 0;\r
 511         sector = NULL;\r
 512         \r
 513         // disk not inserted or invalid media type\r
 514         if(!(inserted && check_media_type())) {\r
 515                 return false;\r
 516         }\r
 517         \r
 518         // search track\r
 519         int trkside = trk * 2 + (side & 1);\r
 520         if(!(0 <= trkside && trkside < 164)) {\r
 521                 return false;\r
 522         }\r
 523         uint32 offset = buffer[0x20 + trkside * 4 + 0];\r
 524         offset |= buffer[0x20 + trkside * 4 + 1] << 8;\r
 525         offset |= buffer[0x20 + trkside * 4 + 2] << 16;\r
 526         offset |= buffer[0x20 + trkside * 4 + 3] << 24;\r
 527         \r
 528         if(!offset) {\r
 529                 return false;\r
 530         }\r
 531         \r
 532         // track found\r
 533         uint8* t = buffer + offset;\r
 534         sector_num = t[4] | (t[5] << 8);\r
 535         \r
 536         if(index >= sector_num) {\r
 537                 return false;\r
 538         }\r
 539         \r
 540         // skip sector\r
 541         for(int i = 0; i < index; i++) {\r
 542                 t += (t[14] | (t[15] << 8)) + 0x10;\r
 543         }\r
 544         \r
 545         // header info\r
 546         id[0] = t[0];\r
 547         id[1] = t[1];\r
 548         id[2] = t[2];\r
 549         id[3] = t[3];\r
 550         uint16 crc = 0;\r
 551         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[0]]);\r
 552         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[1]]);\r
 553         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[2]]);\r
 554         crc = (uint16)((crc << 8) ^ crc_table[(uint8)(crc >> 8) ^ t[3]]);\r
 555         id[4] = crc >> 8;\r
 556         id[5] = crc & 0xff;\r
 557         density = t[6];\r
 558         deleted = t[7];\r
 559         status = t[8];\r
 560         sector = t + 0x10;\r
 561         sector_size = t[14] | (t[15] << 8);\r
 562         \r
 563         return true;\r
 564 }\r
 565 \r
 566 int DISK::get_rpm()\r
 567 {\r
 568         if(drive_rpm != 0) {\r
 569                 return drive_rpm;\r
 570         } else if(inserted) {\r
 571                 return (media_type == MEDIA_TYPE_2HD) ? 360 : 300;\r
 572         } else {\r
 573                 return (drive_type == DRIVE_TYPE_2HD) ? 360 : 300;\r
 574         }\r
 575 }\r
 576 \r
 577 int DISK::get_track_size()\r
 578 {\r
 579         if(inserted) {\r
 580                 return media_type == MEDIA_TYPE_144 ? 12500 : media_type == MEDIA_TYPE_2HD ? 10410 : drive_mfm ? 6250 : 3100;\r
 581         } else {\r
 582                 return drive_type == DRIVE_TYPE_144 ? 12500 : drive_type == DRIVE_TYPE_2HD ? 10410 : drive_mfm ? 6250 : 3100;\r
 583         }\r
 584 }\r
 585 \r
 586 double DISK::get_usec_per_bytes(int bytes)\r
 587 {\r
 588         return 1000000.0 / (get_track_size() * (get_rpm() / 60.0)) * bytes;\r
 589 }\r
 590 \r
 591 bool DISK::check_media_type()\r
 592 {\r
 593         switch(drive_type) {\r
 594         case DRIVE_TYPE_2D:\r
 595                 return (media_type == MEDIA_TYPE_2D);\r
 596         case DRIVE_TYPE_2DD:\r
 597                 return (media_type == MEDIA_TYPE_2D || media_type == MEDIA_TYPE_2DD);\r
 598         case DRIVE_TYPE_2HD:\r
 599                 return (media_type == MEDIA_TYPE_2HD);\r
 600         case DRIVE_TYPE_144:\r
 601                 return (media_type == MEDIA_TYPE_144);\r
 602         case DRIVE_TYPE_UNK:\r
 603                 return true; // always okay\r
 604         }\r
 605         return false;\r
 606 }\r
 607 \r
 608 // teledisk image decoder\r
 609 \r
 610 /*\r
 611         this teledisk image decoder is based on:\r
 612         \r
 613                 LZHUF.C English version 1.0 based on Japanese version 29-NOV-1988\r
 614                 LZSS coded by Haruhiko OKUMURA\r
 615                 Adaptive Huffman Coding coded by Haruyasu YOSHIZAKI\r
 616                 Edited and translated to English by Kenji RIKITAKE\r
 617                 TDLZHUF.C by WTK\r
 618 */\r
 619 \r
 620 #define COPYBUFFER(src, size) { \\r
 621         if(file_size + (size) > DISK_BUFFER_SIZE) { \\r
 622                 return false; \\r
 623         } \\r
 624         memcpy(buffer + file_size, (src), (size)); \\r
 625         file_size += (size); \\r
 626 }\r
 627 \r
 628 bool DISK::teledisk_to_d88()\r
 629 {\r
 630         struct td_hdr_t hdr;\r
 631         struct td_cmt_t cmt;\r
 632         struct td_trk_t trk;\r
 633         struct td_sct_t sct;\r
 634         struct d88_hdr_t d88_hdr;\r
 635         struct d88_sct_t d88_sct;\r
 636         uint8 obuf[512];\r
 637         \r
 638         // check teledisk header\r
 639         fi->Fseek(0, FILEIO_SEEK_SET);\r
 640         fi->Fread(&hdr, sizeof(td_hdr_t), 1);\r
 641         if(hdr.sig[0] == 't' && hdr.sig[1] == 'd') {\r
 642                 // decompress to the temporary file\r
 643                 FILEIO* fo = new FILEIO();\r
 644                 if(!fo->Fopen(temp_path, FILEIO_WRITE_BINARY)) {\r
 645                         delete fo;\r
 646                         return false;\r
 647                 }\r
 648                 int rd = 1;\r
 649                 init_decode();\r
 650                 do {\r
 651                         if((rd = decode(obuf, 512)) > 0) {\r
 652                                 fo->Fwrite(obuf, rd, 1);\r
 653                         }\r
 654                 }\r
 655                 while(rd > 0);\r
 656                 fo->Fclose();\r
 657                 delete fo;\r
 658                 temporary = true;\r
 659                 \r
 660                 // reopen the temporary file\r
 661                 fi->Fclose();\r
 662                 if(!fi->Fopen(temp_path, FILEIO_READ_BINARY)) {\r
 663                         return false;\r
 664                 }\r
 665         }\r
 666         if(hdr.flag & 0x80) {\r
 667                 // skip comment\r
 668                 fi->Fread(&cmt, sizeof(td_cmt_t), 1);\r
 669                 fi->Fseek(cmt.len, FILEIO_SEEK_CUR);\r
 670         }\r
 671         \r
 672         // create d88 image\r
 673         file_size = 0;\r
 674         \r
 675         // create d88 header\r
 676         memset(&d88_hdr, 0, sizeof(d88_hdr_t));\r
 677         strcpy(d88_hdr.title, "TELEDISK");\r
 678         d88_hdr.protect = 0; // non-protected\r
 679         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));\r
 680         \r
 681         // create tracks\r
 682         int trkcnt = 0, trkptr = sizeof(d88_hdr_t);\r
 683         fi->Fread(&trk, sizeof(td_trk_t), 1);\r
 684         while(trk.nsec != 0xff) {\r
 685                 d88_hdr.trkptr[trkcnt++] = trkptr;\r
 686                 if(hdr.sides == 1) {\r
 687                         d88_hdr.trkptr[trkcnt++] = trkptr;\r
 688                 }\r
 689                 \r
 690                 // read sectors in this track\r
 691                 for(int i = 0; i < trk.nsec; i++) {\r
 692                         uint8 buf[2048], dst[2048];\r
 693                         memset(buf, 0, sizeof(buf));\r
 694                         memset(dst, 0, sizeof(dst));\r
 695                         \r
 696                         // read sector header\r
 697                         fi->Fread(&sct, sizeof(td_sct_t), 1);\r
 698                         \r
 699                         // create d88 sector header\r
 700                         memset(&d88_sct, 0, sizeof(d88_sct_t));\r
 701                         d88_sct.c = sct.c;\r
 702                         d88_sct.h = sct.h;\r
 703                         d88_sct.r = sct.r;\r
 704                         d88_sct.n = sct.n;\r
 705                         d88_sct.nsec = trk.nsec;\r
 706                         d88_sct.dens = (hdr.dens & 0x80) ? 0x40 : 0;\r
 707                         d88_sct.del = (sct.ctrl & 4) ? 0x10 : 0;\r
 708                         d88_sct.stat = (sct.ctrl & 2) ? 0x10 : 0; // crc?\r
 709                         d88_sct.size = secsize[sct.n & 3];\r
 710                         \r
 711                         // create sector image\r
 712                         if(sct.ctrl != 0x10) {\r
 713                                 // read sector source\r
 714                                 int len = fi->Fgetc();\r
 715                                 len += fi->Fgetc() * 256 - 1;\r
 716                                 int flag = fi->Fgetc(), d = 0;\r
 717                                 fi->Fread(buf, len, 1);\r
 718                                 \r
 719                                 // convert\r
 720                                 if(flag == 0) {\r
 721                                         memcpy(dst, buf, len);\r
 722                                 } else if(flag == 1) {\r
 723                                         int len2 = buf[0] | (buf[1] << 8);\r
 724                                         while(len2--) {\r
 725                                                 dst[d++] = buf[2];\r
 726                                                 dst[d++] = buf[3];\r
 727                                         }\r
 728                                 } else if(flag == 2) {\r
 729                                         for(int s = 0; s < len;) {\r
 730                                                 int type = buf[s++];\r
 731                                                 int len2 = buf[s++];\r
 732                                                 if(type == 0) {\r
 733                                                         while(len2--) {\r
 734                                                                 dst[d++] = buf[s++];\r
 735                                                         }\r
 736                                                 } else if(type < 5) {\r
 737                                                         uint8 pat[256];\r
 738                                                         int n = 2;\r
 739                                                         while(type-- > 1) {\r
 740                                                                 n *= 2;\r
 741                                                         }\r
 742                                                         for(int j = 0; j < n; j++) {\r
 743                                                                 pat[j] = buf[s++];\r
 744                                                         }\r
 745                                                         while(len2--) {\r
 746                                                                 for(int j = 0; j < n; j++) {\r
 747                                                                         dst[d++] = pat[j];\r
 748                                                                 }\r
 749                                                         }\r
 750                                                 } else {\r
 751                                                         break; // unknown type\r
 752                                                 }\r
 753                                         }\r
 754                                 } else {\r
 755                                         break; // unknown flag\r
 756                                 }\r
 757                         } else {\r
 758                                 d88_sct.size = 0;\r
 759                         }\r
 760                         \r
 761                         // copy to d88\r
 762                         COPYBUFFER(&d88_sct, sizeof(d88_sct_t));\r
 763                         COPYBUFFER(dst, d88_sct.size);\r
 764                         trkptr += sizeof(d88_sct_t) + d88_sct.size;\r
 765                 }\r
 766                 // read next track\r
 767                 fi->Fread(&trk, sizeof(td_trk_t), 1);\r
 768         }\r
 769         d88_hdr.type = ((hdr.dens & 3) == 2) ? MEDIA_TYPE_2HD : ((trkcnt >> 1) > 60) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2D;\r
 770         d88_hdr.size = trkptr;\r
 771         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));\r
 772         return true;\r
 773 }\r
 774 \r
 775 int DISK::next_word()\r
 776 {\r
 777         if(ibufndx >= ibufcnt) {\r
 778                 ibufndx = ibufcnt = 0;\r
 779                 memset(inbuf, 0, 512);\r
 780                 for(int i = 0; i < 512; i++) {\r
 781                         int d = fi->Fgetc();\r
 782                         if(d == EOF) {\r
 783                                 if(i) {\r
 784                                         break;\r
 785                                 }\r
 786                                 return(-1);\r
 787                         }\r
 788                         inbuf[i] = d;\r
 789                         ibufcnt = i + 1;\r
 790                 }\r
 791         }\r
 792         while(getlen <= 8) {\r
 793                 getbuf |= inbuf[ibufndx++] << (8 - getlen);\r
 794                 getlen += 8;\r
 795         }\r
 796         return 0;\r
 797 }\r
 798 \r
 799 int DISK::get_bit()\r
 800 {\r
 801         if(next_word() < 0) {\r
 802                 return -1;\r
 803         }\r
 804         short i = getbuf;\r
 805         getbuf <<= 1;\r
 806         getlen--;\r
 807         return (i < 0) ? 1 : 0;\r
 808 }\r
 809 \r
 810 int DISK::get_byte()\r
 811 {\r
 812         if(next_word() != 0) {\r
 813                 return -1;\r
 814         }\r
 815         uint16 i = getbuf;\r
 816         getbuf <<= 8;\r
 817         getlen -= 8;\r
 818         i >>= 8;\r
 819         return (int)i;\r
 820 }\r
 821 \r
 822 void DISK::start_huff()\r
 823 {\r
 824         int i, j;\r
 825         for(i = 0; i < N_CHAR; i++) {\r
 826                 freq[i] = 1;\r
 827                 son[i] = i + TABLE_SIZE;\r
 828                 prnt[i + TABLE_SIZE] = i;\r
 829         }\r
 830         i = 0; j = N_CHAR;\r
 831         while(j <= ROOT_POSITION) {\r
 832                 freq[j] = freq[i] + freq[i + 1];\r
 833                 son[j] = i;\r
 834                 prnt[i] = prnt[i + 1] = j;\r
 835                 i += 2; j++;\r
 836         }\r
 837         freq[TABLE_SIZE] = 0xffff;\r
 838         prnt[ROOT_POSITION] = 0;\r
 839 }\r
 840 \r
 841 void DISK::reconst()\r
 842 {\r
 843         short i, j = 0, k;\r
 844         uint16 f, l;\r
 845         for(i = 0; i < TABLE_SIZE; i++) {\r
 846                 if(son[i] >= TABLE_SIZE) {\r
 847                         freq[j] = (freq[i] + 1) / 2;\r
 848                         son[j] = son[i];\r
 849                         j++;\r
 850                 }\r
 851         }\r
 852         for(i = 0, j = N_CHAR; j < TABLE_SIZE; i += 2, j++) {\r
 853                 k = i + 1;\r
 854                 f = freq[j] = freq[i] + freq[k];\r
 855                 for(k = j - 1; f < freq[k]; k--);\r
 856                 k++;\r
 857                 l = (j - k) * 2;\r
 858                 memmove(&freq[k + 1], &freq[k], l);\r
 859                 freq[k] = f;\r
 860                 memmove(&son[k + 1], &son[k], l);\r
 861                 son[k] = i;\r
 862         }\r
 863         for(i = 0; i < TABLE_SIZE; i++) {\r
 864                 if((k = son[i]) >= TABLE_SIZE) {\r
 865                         prnt[k] = i;\r
 866                 } else {\r
 867                         prnt[k] = prnt[k + 1] = i;\r
 868                 }\r
 869         }\r
 870 }\r
 871 \r
 872 void DISK::update(int c)\r
 873 {\r
 874         int i, j, k, l;\r
 875         if(freq[ROOT_POSITION] == MAX_FREQ) {\r
 876                 reconst();\r
 877         }\r
 878         c = prnt[c + TABLE_SIZE];\r
 879         do {\r
 880                 k = ++freq[c];\r
 881                 if(k > freq[l = c + 1]) {\r
 882                         while(k > freq[++l]);\r
 883                         l--;\r
 884                         freq[c] = freq[l];\r
 885                         freq[l] = k;\r
 886                         i = son[c];\r
 887                         prnt[i] = l;\r
 888                         if(i < TABLE_SIZE) {\r
 889                                 prnt[i + 1] = l;\r
 890                         }\r
 891                         j = son[l];\r
 892                         son[l] = i;\r
 893                         prnt[j] = c;\r
 894                         if(j < TABLE_SIZE) {\r
 895                                 prnt[j + 1] = c;\r
 896                         }\r
 897                         son[c] = j;\r
 898                         c = l;\r
 899                 }\r
 900         }\r
 901         while((c = prnt[c]) != 0);\r
 902 }\r
 903 \r
 904 short DISK::decode_char()\r
 905 {\r
 906         int ret;\r
 907         uint16 c = son[ROOT_POSITION];\r
 908         while(c < TABLE_SIZE) {\r
 909                 if((ret = get_bit()) < 0) {\r
 910                         return -1;\r
 911                 }\r
 912                 c += (unsigned)ret;\r
 913                 c = son[c];\r
 914         }\r
 915         c -= TABLE_SIZE;\r
 916         update(c);\r
 917         return c;\r
 918 }\r
 919 \r
 920 short DISK::decode_position()\r
 921 {\r
 922         short bit;\r
 923         uint16 i, j, c;\r
 924         if((bit = get_byte()) < 0) {\r
 925                 return -1;\r
 926         }\r
 927         i = (uint16)bit;\r
 928         c = (uint16)d_code[i] << 6;\r
 929         j = d_len[i] - 2;\r
 930         while(j--) {\r
 931                 if((bit = get_bit()) < 0) {\r
 932                          return -1;\r
 933                 }\r
 934                 i = (i << 1) + bit;\r
 935         }\r
 936         return (c | i & 0x3f);\r
 937 }\r
 938 \r
 939 void DISK::init_decode()\r
 940 {\r
 941         ibufcnt= ibufndx = bufcnt = getbuf = 0;\r
 942         getlen = 0;\r
 943         start_huff();\r
 944         for(int i = 0; i < STRING_BUFFER_SIZE - LOOKAHEAD_BUFFER_SIZE; i++) {\r
 945                 text_buf[i] = ' ';\r
 946         }\r
 947         ptr = STRING_BUFFER_SIZE - LOOKAHEAD_BUFFER_SIZE;\r
 948 }\r
 949 \r
 950 int DISK::decode(uint8 *buf, int len)\r
 951 {\r
 952         short c, pos;\r
 953         int  count;\r
 954         for(count = 0; count < len;) {\r
 955                 if(bufcnt == 0) {\r
 956                         if((c = decode_char()) < 0) {\r
 957                                 return count;\r
 958                         }\r
 959                         if(c < 256) {\r
 960                                 *(buf++) = (uint8)c;\r
 961                                 text_buf[ptr++] = (uint8)c;\r
 962                                 ptr &= (STRING_BUFFER_SIZE - 1);\r
 963                                 count++;\r
 964                         } else {\r
 965                                 if((pos = decode_position()) < 0) {\r
 966                                         return count;\r
 967                                 }\r
 968                                 bufpos = (ptr - pos - 1) & (STRING_BUFFER_SIZE - 1);\r
 969                                 bufcnt = c - 255 + THRESHOLD;\r
 970                                 bufndx = 0;\r
 971                         }\r
 972                 } else {\r
 973                         while(bufndx < bufcnt && count < len) {\r
 974                                 c = text_buf[(bufpos + bufndx) & (STRING_BUFFER_SIZE - 1)];\r
 975                                 *(buf++) = (uint8)c;\r
 976                                 bufndx++;\r
 977                                 text_buf[ptr++] = (uint8)c;\r
 978                                 ptr &= (STRING_BUFFER_SIZE - 1);\r
 979                                 count++;\r
 980                         }\r
 981                         if(bufndx >= bufcnt) {\r
 982                                 bufndx = bufcnt = 0;\r
 983                         }\r
 984                 }\r
 985         }\r
 986         return count;\r
 987 }\r
 988 \r
 989 // imagedisk image decoder\r
 990 \r
 991 bool DISK::imagedisk_to_d88()\r
 992 {\r
 993         struct imd_trk_t trk;\r
 994         struct d88_hdr_t d88_hdr;\r
 995         struct d88_sct_t d88_sct;\r
 996         \r
 997         // skip comment\r
 998         fi->Fseek(0, FILEIO_SEEK_SET);\r
 999         int tmp;\r
1000         while((tmp = fi->Fgetc()) != 0x1a) {\r
1001                 if(tmp == EOF) {\r
1002                         return false;\r
1003                 }\r
1004         }\r
1005         \r
1006         // create d88 image\r
1007         file_size = 0;\r
1008         \r
1009         // create d88 header\r
1010         memset(&d88_hdr, 0, sizeof(d88_hdr_t));\r
1011         strcpy(d88_hdr.title, "IMAGEDISK");\r
1012         d88_hdr.protect = 0; // non-protected\r
1013         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));\r
1014         \r
1015         // create tracks\r
1016         int trkptr = sizeof(d88_hdr_t);\r
1017         int trkcnt = 0, mode;\r
1018         \r
1019         for(int t = 0; t < 164; t++) {\r
1020                 // check end of file\r
1021                 if(fi->Fread(&trk, sizeof(imd_trk_t), 1) != 1) {\r
1022                         break;\r
1023                 }\r
1024                 trkcnt = t;\r
1025                 \r
1026                 // check track header\r
1027                 if(t == 0) {\r
1028                         mode = trk.mode % 3; // 0=500kbps, 1=300kbps, 2=250kbps\r
1029                 }\r
1030                 if(!trk.nsec) {\r
1031                         continue;\r
1032                 }\r
1033                 d88_hdr.trkptr[t] = trkptr;\r
1034                 \r
1035                 // setup sector id\r
1036                 uint8 c[64], h[64], r[64];\r
1037                 fi->Fread(r, trk.nsec, 1);\r
1038                 if(trk.head & 0x80) {\r
1039                         fi->Fread(c, trk.nsec, 1);\r
1040                 } else {\r
1041                         memset(c, trk.cyl, sizeof(c));\r
1042                 }\r
1043                 if(trk.head & 0x40) {\r
1044                         fi->Fread(h, trk.nsec, 1);\r
1045                 } else {\r
1046                         memset(h, trk.head & 1, sizeof(h));\r
1047                 }\r
1048                 \r
1049                 // read sectors in this track\r
1050                 for(int i = 0; i < trk.nsec; i++) {\r
1051                         // create d88 sector header\r
1052                         static const uint8 del[] = {0, 0, 0, 0x10, 0x10, 0, 0, 0x10, 0x10};\r
1053                         static const uint8 err[] = {0, 0, 0, 0, 0, 0x10, 0x10, 0x10, 0x10};\r
1054                         int sectype = fi->Fgetc();\r
1055                         if(sectype > 8) {\r
1056                                 return false;\r
1057                         }\r
1058                         memset(&d88_sct, 0, sizeof(d88_sct_t));\r
1059                         d88_sct.c = c[i];\r
1060                         d88_sct.h = h[i];\r
1061                         d88_sct.r = r[i];\r
1062                         d88_sct.n = trk.size;\r
1063                         d88_sct.nsec = trk.nsec;\r
1064                         d88_sct.dens = (trk.mode < 3) ? 0x40 : 0;\r
1065                         d88_sct.del = del[sectype];\r
1066                         d88_sct.stat = err[sectype];\r
1067                         d88_sct.size = secsize[trk.size & 7];\r
1068                         \r
1069                         // create sector image\r
1070                         uint8 dst[8192];\r
1071                         if(sectype == 1 || sectype == 3 || sectype == 5 || sectype == 7) {\r
1072                                 // uncompressed\r
1073                                 fi->Fread(dst, d88_sct.size, 1);\r
1074                         } else if(sectype == 2 || sectype == 4 || sectype == 6 || sectype == 8) {\r
1075                                 // compressed\r
1076                                 int tmp = fi->Fgetc();\r
1077                                 memset(dst, tmp, d88_sct.size);\r
1078                         } else {\r
1079                                 d88_sct.size = 0;\r
1080                         }\r
1081                         \r
1082                         // copy to d88\r
1083                         COPYBUFFER(&d88_sct, sizeof(d88_sct_t));\r
1084                         COPYBUFFER(dst, d88_sct.size);\r
1085                         trkptr += sizeof(d88_sct_t) + d88_sct.size;\r
1086                 }\r
1087         }\r
1088         d88_hdr.type = (mode == 0) ? MEDIA_TYPE_2HD : ((trkcnt >> 1) > 60) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2D;\r
1089         d88_hdr.size = trkptr;\r
1090         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));\r
1091         return true;\r
1092 }\r
1093 \r
1094 // cpdread image decoder (from MESS formats/dsk_dsk.c)\r
1095 \r
1096 bool DISK::cpdread_to_d88(int extended)\r
1097 {\r
1098         struct d88_hdr_t d88_hdr;\r
1099         struct d88_sct_t d88_sct;\r
1100         int total = 0;\r
1101         \r
1102         // get cylinder number and side number\r
1103         memcpy(tmp_buffer, buffer, file_size);\r
1104         int ncyl = tmp_buffer[0x30];\r
1105         int nside = tmp_buffer[0x31];\r
1106         \r
1107         // create d88 image\r
1108         file_size = 0;\r
1109         \r
1110         // create d88 header\r
1111         memset(&d88_hdr, 0, sizeof(d88_hdr_t));\r
1112         strcpy(d88_hdr.title, "CPDRead");\r
1113         d88_hdr.protect = 0; // non-protected\r
1114         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));\r
1115         \r
1116         // create tracks\r
1117         int trkofs = 0x100, trkofs_ptr = 0x34;\r
1118         int trkptr = sizeof(d88_hdr_t);\r
1119         \r
1120         for(int c = 0; c < ncyl; c++) {\r
1121                 for(int h = 0; h < nside; h++) {\r
1122                         // read sectors in this track\r
1123                         uint8 *track_info = tmp_buffer + trkofs;\r
1124                         int cyl = track_info[0x10];\r
1125                         int side = track_info[0x11];\r
1126                         int nsec = track_info[0x15];\r
1127                         int size = 1 << (track_info[0x14] + 7); // standard\r
1128                         int sctofs = trkofs + 0x100;\r
1129                         \r
1130                         if(nside == 1) {\r
1131                                 // double side\r
1132                                 d88_hdr.trkptr[2 * cyl] = d88_hdr.trkptr[2 * cyl + 1] = trkptr;\r
1133                         } else {\r
1134                                 d88_hdr.trkptr[2 * cyl + side] = trkptr;\r
1135                         }\r
1136                         for(int s = 0; s < nsec; s++) {\r
1137                                 // get sector size\r
1138                                 uint8 *sector_info = tmp_buffer + trkofs + 0x18 + s * 8;\r
1139                                 if(extended) {\r
1140                                         size = sector_info[6] + sector_info[7] * 256;\r
1141                                 }\r
1142                                 \r
1143                                 // create d88 sector header\r
1144                                 memset(&d88_sct, 0, sizeof(d88_sct_t));\r
1145                                 d88_sct.c = sector_info[0];\r
1146                                 d88_sct.h = sector_info[1];\r
1147                                 d88_sct.r = sector_info[2];\r
1148                                 d88_sct.n = sector_info[3];\r
1149                                 d88_sct.nsec = nsec;\r
1150                                 d88_sct.dens = 0;\r
1151                                 d88_sct.del = (sector_info[5] & 0x40) ? 0x10 : 0;\r
1152                                 d88_sct.stat = 0;\r
1153                                 d88_sct.size = size;\r
1154                                 \r
1155                                 // copy to d88\r
1156                                 COPYBUFFER(&d88_sct, sizeof(d88_sct_t));\r
1157                                 COPYBUFFER(tmp_buffer + sctofs, size);\r
1158                                 trkptr += sizeof(d88_sct_t) + size;\r
1159                                 sctofs += size;\r
1160                                 total += size;\r
1161                         }\r
1162                         \r
1163                         if(extended) {\r
1164                                 trkofs += tmp_buffer[trkofs_ptr++] * 256;\r
1165                         } else {\r
1166                                 trkofs += tmp_buffer[0x32] + tmp_buffer[0x33] * 256;\r
1167                         }\r
1168                 }\r
1169         }\r
1170         d88_hdr.type = (total < (368640 + 655360) / 2) ? MEDIA_TYPE_2D : (total < (737280 + 1228800) / 2) ? MEDIA_TYPE_2DD : MEDIA_TYPE_2HD;\r
1171         d88_hdr.size = trkptr;\r
1172         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));\r
1173         return true;\r
1174 }\r
1175 \r
1176 // standard image decoder\r
1177 \r
1178 bool DISK::standard_to_d88(int type, int ncyl, int nside, int nsec, int size)\r
1179 {\r
1180         struct d88_hdr_t d88_hdr;\r
1181         struct d88_sct_t d88_sct;\r
1182         int n = 0, t = 0;\r
1183         \r
1184         file_size = 0;\r
1185         \r
1186         // create d88 header\r
1187         memset(&d88_hdr, 0, sizeof(d88_hdr_t));\r
1188         strcpy(d88_hdr.title, "STANDARD");\r
1189         d88_hdr.protect = 0; // non-protected\r
1190         d88_hdr.type = (type == MEDIA_TYPE_144) ? MEDIA_TYPE_2HD : type;\r
1191         media_type = type;\r
1192         COPYBUFFER(&d88_hdr, sizeof(d88_hdr_t));\r
1193         \r
1194         // sector length\r
1195         for(int i = 0; i < 8; i++) {\r
1196                 if(size == (128 << i)) {\r
1197                         n = i;\r
1198                         break;\r
1199                 }\r
1200         }\r
1201         \r
1202         // create tracks\r
1203         int trkptr = sizeof(d88_hdr_t);\r
1204         for(int c = 0; c < ncyl; c++) {\r
1205                 for(int h = 0; h < nside; h++) {\r
1206                         d88_hdr.trkptr[t++] = trkptr;\r
1207                         if(nside == 1) {\r
1208                                 // double side\r
1209                                 d88_hdr.trkptr[t++] = trkptr;\r
1210                         }\r
1211                         \r
1212                         // read sectors in this track\r
1213                         for(int s = 0; s < nsec; s++) {\r
1214                                 // create d88 sector header\r
1215                                 memset(&d88_sct, 0, sizeof(d88_sct_t));\r
1216                                 d88_sct.c = c;\r
1217                                 d88_sct.h = h;\r
1218                                 d88_sct.r = s + 1;\r
1219                                 d88_sct.n = n;\r
1220                                 d88_sct.nsec = nsec;\r
1221                                 d88_sct.dens = 0;\r
1222                                 d88_sct.del = 0;\r
1223                                 d88_sct.stat = 0;\r
1224                                 d88_sct.size = size;\r
1225                                 \r
1226                                 // create sector image\r
1227                                 uint8 dst[16384];\r
1228                                 memset(dst, 0xe5, sizeof(dst));\r
1229                                 fi->Fread(dst, size, 1);\r
1230                                 \r
1231                                 // copy to d88\r
1232                                 COPYBUFFER(&d88_sct, sizeof(d88_sct_t));\r
1233                                 COPYBUFFER(dst, size);\r
1234                                 trkptr += sizeof(d88_sct_t) + size;\r
1235                         }\r
1236                 }\r
1237         }\r
1238         d88_hdr.size = trkptr;\r
1239         memcpy(buffer, &d88_hdr, sizeof(d88_hdr_t));\r
1240         return true;\r
1241 }\r
1242 \r
1243 #define STATE_VERSION   1\r
1244 \r
1245 void DISK::save_state(FILEIO* state_fio)\r
1246 {\r
1247         state_fio->FputUint32(STATE_VERSION);\r
1248         \r
1249         state_fio->Fwrite(buffer, sizeof(buffer), 1);\r
1250         state_fio->Fwrite(orig_path, sizeof(orig_path), 1);\r
1251         state_fio->Fwrite(dest_path, sizeof(dest_path), 1);\r
1252         state_fio->FputInt32(file_size);\r
1253         state_fio->FputInt32(file_offset);\r
1254         state_fio->FputUint32(crc32);\r
1255         state_fio->Fwrite(fdi_header, sizeof(fdi_header), 1);\r
1256         state_fio->FputBool(inserted);\r
1257         state_fio->FputBool(ejected);\r
1258         state_fio->FputBool(write_protected);\r
1259         state_fio->FputBool(changed);\r
1260         state_fio->FputUint8(media_type);\r
1261         state_fio->FputBool(is_standard_image);\r
1262         state_fio->FputBool(is_fdi_image);\r
1263         state_fio->FputBool(is_alpha);\r
1264         state_fio->Fwrite(track, sizeof(track), 1);\r
1265         state_fio->FputInt32(sector_num);\r
1266         state_fio->FputInt32(data_size_shift);\r
1267         state_fio->FputBool(too_many_sectors);\r
1268         state_fio->FputBool(no_skew);\r
1269         state_fio->Fwrite(sync_position, sizeof(sync_position), 1);\r
1270         state_fio->Fwrite(id_position, sizeof(id_position), 1);\r
1271         state_fio->Fwrite(data_position, sizeof(data_position), 1);\r
1272         state_fio->FputInt32(sector ? (int)(sector - buffer) : -1);\r
1273         state_fio->FputInt32(sector_size);\r
1274         state_fio->Fwrite(id, sizeof(id), 1);\r
1275         state_fio->FputUint8(density);\r
1276         state_fio->FputUint8(deleted);\r
1277         state_fio->FputUint8(status);\r
1278         state_fio->FputUint8(drive_type);\r
1279         state_fio->FputInt32(drive_rpm);\r
1280         state_fio->FputBool(drive_mfm);\r
1281 }\r
1282 \r
1283 bool DISK::load_state(FILEIO* state_fio)\r
1284 {\r
1285         if(state_fio->FgetUint32() != STATE_VERSION) {\r
1286                 return false;\r
1287         }\r
1288         state_fio->Fread(buffer, sizeof(buffer), 1);\r
1289         state_fio->Fread(orig_path, sizeof(orig_path), 1);\r
1290         state_fio->Fread(dest_path, sizeof(dest_path), 1);\r
1291         file_size = state_fio->FgetInt32();\r
1292         file_offset = state_fio->FgetInt32();\r
1293         crc32 = state_fio->FgetUint32();\r
1294         state_fio->Fread(fdi_header, sizeof(fdi_header), 1);\r
1295         inserted = state_fio->FgetBool();\r
1296         ejected = state_fio->FgetBool();\r
1297         write_protected = state_fio->FgetBool();\r
1298         changed = state_fio->FgetBool();\r
1299         media_type = state_fio->FgetUint8();\r
1300         is_standard_image = state_fio->FgetBool();\r
1301         is_fdi_image = state_fio->FgetBool();\r
1302         is_alpha = state_fio->FgetBool();\r
1303         state_fio->Fread(track, sizeof(track), 1);\r
1304         sector_num = state_fio->FgetInt32();\r
1305         data_size_shift = state_fio->FgetInt32();\r
1306         too_many_sectors = state_fio->FgetBool();\r
1307         no_skew = state_fio->FgetBool();\r
1308         state_fio->Fread(sync_position, sizeof(sync_position), 1);\r
1309         state_fio->Fread(id_position, sizeof(id_position), 1);\r
1310         state_fio->Fread(data_position, sizeof(data_position), 1);\r
1311         int offset = state_fio->FgetInt32();\r
1312         sector = (offset != -1) ? buffer + offset : NULL;\r
1313         sector_size = state_fio->FgetInt32();\r
1314         state_fio->Fread(id, sizeof(id), 1);\r
1315         density = state_fio->FgetUint8();\r
1316         deleted = state_fio->FgetUint8();\r
1317         status = state_fio->FgetUint8();\r
1318         drive_type = state_fio->FgetUint8();\r
1319         drive_rpm = state_fio->FgetInt32();\r
1320         drive_mfm = state_fio->FgetBool();\r
1321         return true;\r
1322 }\r
1323 \r