source/src/vm/harddisk.cpp

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2006.09.16-
   6
   7         [ d88 handler ]
   8 */
   9
  10 #include "harddisk.h"
  11 #include "../fileio.h"
  12
  13 void HARDDISK::open(const _TCHAR* file_path, int default_sector_size)
  14 {
  15         uint8_t header[512];
  16         pair_t tmp;
  17
  18         close();
  19
  20         if(FILEIO::IsFileExisting(file_path)) {
  21                 fio = new FILEIO();
  22
  23                 if(fio->Fopen(file_path, FILEIO_READ_WRITE_BINARY)) {
  24                         // from NP2 sxsihdd.c
  25                         const char sig_vhd[8] = "VHD1.00";
  26                         const char sig_nhd[15] = "T98HDDIMAGE.R0";
  27
  28                         fio->Fread(header, 256, 1);
  29
  30                         if(check_file_extension(file_path, _T(".thd"))) {
  31                                 // T98
  32 /*
  33                                 typedef struct thd_header_s {
  34                                         int16_t cylinders;
  35                                 } thd_header_s;
  36 */
  37                                 header_size = 256;
  38                                 tmp.read_2bytes_le_from(header + 0);
  39                                 int cylinders = tmp.sd;
  40                                 surfaces = 8;
  41                                 int sectors = 33;
  42                                 sector_size = 256;
  43                                 sector_num = cylinders * surfaces * sectors;
  44                         } else if(check_file_extension(file_path, _T(".nhd")) && memcmp(header, sig_nhd, 15) == 0) {
  45                                 // T98Next
  46 /*
  47                                 typedef struct nhd_header_s {
  48                                         char sig[16];
  49                                         char comment[256];
  50                                         int32_t header_size;    // +272
  51                                         int32_t cylinders;      // +276
  52                                         int16_t surfaces;       // +280
  53                                         int16_t sectors;        // +282
  54                                         int16_t sector_size;    // +284
  55                                         uint8_t reserved[0xe2];
  56                                 } nhd_header_t;
  57 */
  58                                 tmp.read_4bytes_le_from(header + 272);
  59                                 header_size = tmp.sd;
  60                                 tmp.read_4bytes_le_from(header + 276);
  61                                 int cylinders = tmp.sd;
  62                                 tmp.read_2bytes_le_from(header + 280);
  63                                 surfaces = tmp.sd;
  64                                 tmp.read_2bytes_le_from(header + 282);
  65                                 int sectors = tmp.sd;
  66                                 tmp.read_2bytes_le_from(header + 284);
  67                                 sector_size = tmp.sd;
  68                                 sector_num = cylinders * surfaces * sectors;
  69                         } else if(check_file_extension(file_path, _T(".hdi"))) {
  70                                 // ANEX86
  71 /*
  72                                 typedef struct hdi_header_s {
  73                                         int32_t dummy;          // + 0
  74                                         int32_t hdd_type;       // + 4
  75                                         int32_t header_size;    // + 8
  76                                         int32_t hdd_size;       // +12
  77                                         int32_t sector_size;    // +16
  78                                         int32_t sectors;        // +20
  79                                         int32_t surfaces;       // +24
  80                                         int32_t cylinders;      // +28
  81                                 } hdi_header_t;
  82 */
  83                                 tmp.read_4bytes_le_from(header + 8);
  84                                 header_size = tmp.sd;
  85                                 tmp.read_4bytes_le_from(header + 16);
  86                                 sector_size = tmp.sd;
  87                                 tmp.read_4bytes_le_from(header + 20);
  88                                 int sectors = tmp.sd;
  89                                 tmp.read_4bytes_le_from(header + 24);
  90                                 surfaces = tmp.sd;
  91                                 tmp.read_4bytes_le_from(header + 28);
  92                                 int cylinders = tmp.sd;
  93                                 sector_num = cylinders * surfaces * sectors;
  94                         } else if(check_file_extension(file_path, _T(".hdd")) && memcmp(header, sig_vhd, 5) == 0) {
  95                                 // Virtual98
  96 /*
  97                                 typedef struct {
  98                                         char    sig[3];         // +  0
  99                                         char    ver[4];         // +  3
 100                                         char    delimita;       // +  7
 101                                         char    comment[128];   // +  8
 102                                         uint8_t pad1[4];        // +136
 103                                         int16_t mbsize;         // +140
 104                                         int16_t sectorsize;     // +142
 105                                         uint8_t sectors;        // +144
 106                                         uint8_t surfaces;       // +145
 107                                         int16_t cylinders;      // +146
 108                                         int32_t totals;         // +148
 109                                         uint8_t pad2[0x44];     // +152
 110                                 } virtual98_header_t;
 111 */
 112                                 header_size = 288;
 113                                 tmp.read_2bytes_le_from(header + 142);
 114                                 sector_size = tmp.sd;
 115 //                              int sectors = header[144];
 116                                 surfaces = header[145];
 117 //                              tmp.read_2bytes_le_from(header + 146);
 118 //                              int cylinders = tmp.sd;
 119                                 tmp.read_4bytes_le_from(header + 148);
 120                                 sector_num = tmp.sd;
 121 //                              sector_num = cylinders * surfaces * sectors;
 122                         } else {
 123                                 // solid
 124                                 header_size = 0;
 125                                 // sectors = 33, surfaces = 4, cylinders = 153, sector_size = 256       // 5MB
 126                                 // sectors = 33, surfaces = 4, cylinders = 310, sector_size = 256       // 10MB
 127                                 surfaces = (default_sector_size == 256 && fio->FileLength() <= 33 * 4 * 310 * 256) ? 4 : 8;
 128                                 sector_size = default_sector_size;
 129                                 sector_num = fio->FileLength() / sector_size;
 130                         }
 131                 }
 132         }
 133 }
 134
 135 void HARDDISK::close()
 136 {
 137         // write disk image
 138         if(fio != NULL) {
 139                 if(fio->IsOpened()) {
 140                         fio->Fclose();
 141                 }
 142                 delete fio;
 143                 fio = NULL;
 144         }
 145 }
 146
 147 bool HARDDISK::mounted()
 148 {
 149         return (fio != NULL && fio->IsOpened());
 150 }
 151
 152 bool HARDDISK::accessed()
 153 {
 154         bool value = access;
 155         access = false;
 156         return value;
 157 }
 158
 159 bool HARDDISK::read_buffer(long position, int length, uint8_t *buffer)
 160 {
 161         if(mounted()) {
 162                 if(fio->Fseek(header_size + position, FILEIO_SEEK_SET) == 0) {
 163                         access = true;
 164                         return (fio->Fread(buffer, length, 1) == 1);
 165                 }
 166         }
 167         return false;
 168 }
 169
 170 bool HARDDISK::write_buffer(long position, int length, uint8_t *buffer)
 171 {
 172         if(mounted()) {
 173                 if(fio->Fseek(header_size + position, FILEIO_SEEK_SET) == 0) {
 174                         access = true;
 175                         return (fio->Fwrite(buffer, length, 1) == 1);
 176                 }
 177         }
 178         return false;
 179 }
 180