Shamusworld >> Repos - virtualjaguar/blob - src/cdi.cpp

   1 //
   2 // CD Interface handler
   3 //
   4 // by David Raingeard
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Cleanups by James L. Hammons
   7 //
   8
   9 #include "cdi.h"
  10
  11 /* Added by SDLEMU (http://sdlemu.ngemu.com) */
  12 /* Added for GCC UNIX compatibility          */
  13 #ifdef __GCCUNIX__
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <fcntl.h>
  17
  18 #define O_BINARY (0)
  19 #endif
  20
  21 #define CDI_V2  0x80000004
  22 #define CDI_V3  0x80000005
  23 #define CDI_V35 0x80000006
  24
  25 static uint8 cdi_track_start_mark[10] =
  26         { 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF };
  27
  28 int cdi_fp;
  29 uint32 cdi_load_address;
  30 uint32 cdi_code_length;
  31 s_cdi_descriptor * cdi_descriptor;
  32 s_cdi_track ** cdi_tracks;
  33 uint32 cdi_tracks_count;
  34
  35
  36 int cdi_open(char * path)
  37 {
  38         WriteLog("CDI: Opening %s\n", path);
  39         return open(path, O_BINARY | O_RDONLY);
  40 }
  41
  42 void cdi_close(int fp)
  43 {
  44         WriteLog("CDI: Closing\n");
  45         close(fp);
  46 }
  47
  48
  49 /*long tell(int fd)
  50 {
  51         return lseek(fd, 0LL, SEEK_CUR);
  52 }*/
  53
  54
  55 s_cdi_descriptor * cdi_get_descriptor(int fp, FILE * stdfp)
  56 {
  57         s_cdi_descriptor * descriptor;
  58         uint32 previous_position = 0;
  59
  60         if (fp == -1)
  61                 return 0;
  62
  63         descriptor = (s_cdi_descriptor *)malloc(sizeof(s_cdi_descriptor));
  64
  65         if (descriptor == NULL)
  66                 return 0;
  67
  68         lseek(fp, 0, SEEK_END);
  69 //Why???        descriptor->length=tell(fp);
  70         descriptor->length = lseek(fp, 0LL, SEEK_CUR);
  71
  72         if (descriptor->length < 8)
  73         {
  74                 if (stdfp)
  75                         fprintf(stdfp, "CDI: Image is too short (%i bytes)\n", (int)descriptor->length);
  76                 free(descriptor);
  77                 return 0;
  78         }
  79
  80         lseek(fp, descriptor->length - 8, SEEK_SET);
  81         read(fp, &descriptor->version, 4);
  82         read(fp, &descriptor->header_offset, 4);
  83         lseek(fp, descriptor->header_offset, SEEK_SET);
  84         read(fp, &descriptor->nb_of_sessions, 2);
  85
  86         descriptor->sessions=(s_cdi_session *)malloc(descriptor->nb_of_sessions * sizeof(s_cdi_session));
  87
  88         if (descriptor->sessions == NULL)
  89         {
  90                 free(descriptor);
  91                 return 0;
  92         }
  93
  94         if (stdfp)
  95                 fprintf(stdfp, "CDI: %i sessions\n", descriptor->nb_of_sessions);
  96
  97         uint32 track_position = 0;
  98         for(uint16 session=0; session<descriptor->nb_of_sessions; session++)
  99         {
 100                 read(fp, &descriptor->sessions[session].nb_of_tracks, 2);
 101                 descriptor->sessions[session].tracks = (s_cdi_track *)malloc(descriptor->sessions[session].nb_of_tracks * sizeof(s_cdi_track));
 102
 103                 if (stdfp)
 104                         fprintf(stdfp, "CDI:\nCDI: Reading session %i (%i tracks)\n", session, descriptor->sessions[session].nb_of_tracks);
 105
 106                 for (uint16 track=0; track<descriptor->sessions[session].nb_of_tracks; track++)
 107                 {
 108                         static char current_start_mark[10];
 109                         s_cdi_track * current_track=&descriptor->sessions[session].tracks[track];
 110                         if (stdfp)
 111                                 fprintf(stdfp, "CDI:\nCDI: \t\tReading track %i\n",track);
 112
 113                         uint32 temp_value;
 114
 115                         read(fp, &temp_value, 4);
 116
 117                         if (temp_value != 0)
 118                                 lseek(fp, 8, SEEK_CUR); // extra data (DJ 3.00.780 and up)
 119
 120                         read(fp, current_start_mark, 10);
 121
 122                         if (memcmp(cdi_track_start_mark, current_start_mark, 10))
 123                         {
 124                                 if (stdfp)
 125                                         fprintf(stdfp, "CDI: Could not find the track start mark\n");
 126                                 return 0;
 127                         }
 128
 129                         read(fp, current_start_mark, 10);
 130
 131                         if (memcmp(cdi_track_start_mark, current_start_mark, 10))
 132                         {
 133                                 if (stdfp)
 134                                         fprintf(stdfp, "CDI: Could not find the track start mark\n");
 135                                 return 0;
 136                         }
 137
 138                         lseek(fp, 4, SEEK_CUR);
 139                         read(fp, &current_track->filename_length, 1);
 140                         lseek(fp, current_track->filename_length, SEEK_CUR);
 141
 142                         lseek(fp, 11, SEEK_CUR);
 143                         lseek(fp, 4, SEEK_CUR);
 144                         lseek(fp, 4, SEEK_CUR);
 145                         read(fp, &temp_value, 4);
 146
 147                         if (temp_value == 0x80000000)
 148                                 lseek(fp, 8, SEEK_CUR); // DJ4
 149
 150                         lseek(fp, 2, SEEK_CUR);
 151
 152                         read(fp, &current_track->pregap_length, 4);
 153
 154                         if (current_track->pregap_length != 150)
 155                                 WriteLog("CDI: Warning: Pregap different than 150\n");
 156
 157                         read(fp, &current_track->length, 4);
 158
 159                         if (stdfp)
 160                                 fprintf(stdfp, "CDI: \t\t\tPregap length: %i\n", (int)current_track->pregap_length);
 161                         if (stdfp)
 162                                 fprintf(stdfp, "CDI: \t\t\tLength: %i\n", (int)current_track->length);
 163
 164                         lseek(fp, 6, SEEK_CUR);
 165
 166                         read(fp, &current_track->mode, 4);
 167
 168                         if (stdfp)
 169                                 fprintf(stdfp, "CDI: \t\t\tMode: %i\n", (int)current_track->mode);
 170
 171                         lseek(fp, 12, SEEK_CUR);
 172                         read(fp, &current_track->start_lba, 4);
 173
 174                         if (stdfp)
 175                                 fprintf(stdfp, "CDI: \t\t\tStart LBA: %i\n", (int)current_track->start_lba);
 176
 177                         read(fp, &current_track->total_length, 4);
 178
 179                         if (stdfp)
 180                                 fprintf(stdfp, "CDI: \t\t\tTotal length: %i\n", (int)current_track->total_length);
 181
 182                         lseek(fp, 16, SEEK_CUR);
 183                         read(fp, &current_track->sector_size_value, 4);
 184
 185                         if (stdfp)
 186                                 fprintf(stdfp, "CDI: \t\t\tSector size: %i\n", (int)current_track->sector_size_value);
 187
 188                         switch(current_track->sector_size_value)
 189                         {
 190                         case 0: current_track->sector_size = 2048; break;
 191                         case 1: current_track->sector_size = 2336; break;
 192                         case 2: current_track->sector_size = 2352; break;
 193                         default:
 194                         {
 195                                 if (stdfp)
 196                                         fprintf(stdfp, "CDI: \t\t\tUnsupported %i bytes sector\n", (int)current_track->sector_size_value);
 197                                 return 0;
 198                         }
 199                         }
 200
 201                         if (current_track->mode > 2)
 202                                 if (stdfp)
 203                                         fprintf(stdfp, "CDI: \t\t\tTrack mode %i not supported\n", (int)current_track->mode);
 204
 205                         lseek(fp, 29, SEEK_CUR);
 206
 207                         if (descriptor->version != CDI_V2)
 208                         {
 209                                 lseek(fp, 5, SEEK_CUR);
 210                                 read(fp, &temp_value, 4);
 211
 212                                 if (temp_value == 0xFFFFFFFF)
 213                                         lseek(fp, 78, SEEK_CUR); // extra data (DJ 3.00.780 and up)
 214                         }
 215
 216                         current_track->position = track_position;
 217                         track_position += (current_track->pregap_length+current_track->length) * current_track->sector_size;
 218                         previous_position = track_position;
 219                 }
 220
 221                 lseek(fp, 4, SEEK_CUR);
 222                 lseek(fp, 8, SEEK_CUR);
 223
 224                 if (descriptor->version != CDI_V2)
 225                         lseek(fp, 1, SEEK_CUR);
 226
 227         }
 228
 229     if (descriptor->header_offset == 0)
 230                 return 0;
 231
 232         return descriptor;
 233 }
 234
 235 void cdi_dump_descriptor(FILE * fp, s_cdi_descriptor * cdi_descriptor)
 236 {
 237         fprintf(fp, "CDI: %i Mb\n", (int)(cdi_descriptor->length >> 20));
 238         fprintf(fp, "CDI: Format version ");
 239         switch(cdi_descriptor->version)
 240         {
 241         case CDI_V2:
 242                 fprintf(fp, "2\n");
 243                 break;
 244         case CDI_V3:
 245                 fprintf(fp, "3\n");
 246                 break;
 247         case CDI_V35:
 248                 fprintf(fp, "3.5\n");
 249                 break;
 250         default:
 251                 fprintf(fp, "unknown\n");
 252         }
 253         fprintf(fp, "CDI: %i sessions\n", cdi_descriptor->nb_of_sessions);
 254 }
 255
 256 uint8 * cdi_extract_boot_code(int fp, s_cdi_descriptor * cdi_descriptor)
 257 {
 258         s_cdi_track * boot_track = &cdi_descriptor->sessions[1].tracks[0];
 259         uint32 boot_track_size = boot_track->length * boot_track->sector_size;
 260
 261         uint8 * boot_track_data = (uint8 *)malloc(boot_track_size);
 262         lseek(fp, 2 + (boot_track->position), SEEK_SET);
 263         read(fp, boot_track_data, boot_track_size);
 264
 265         uint32 * boot_track_data_32 = (uint32 *)boot_track_data;
 266         uint32 offset = 0;
 267         while (offset < (boot_track_size >> 2))
 268         {
 269                 if (boot_track_data_32[offset] == 0x49205452)
 270                         break;
 271                 offset++;
 272         }
 273         if (offset == (boot_track_size >> 2))
 274         {
 275                 WriteLog("CDI: Cannot find the boot code\n");
 276                 return NULL;
 277         }
 278
 279 //This is likely wrong, but won't get a chance to fix it until I can get a CD image
 280 //to work with...
 281         offset = (offset << 2) + 4;
 282         uint16 * data16 = (uint16 *)&boot_track_data[offset];
 283         cdi_load_address = *data16++;
 284         cdi_load_address <<= 16;
 285         cdi_load_address |= *data16++;
 286         cdi_code_length = *data16++;
 287         cdi_code_length <<= 16;
 288         cdi_code_length |= *data16++;
 289         WriteLog("CDI: Load address: %08X\n", cdi_load_address);
 290         WriteLog("CDI: Length: %08X\n", cdi_code_length);
 291 //No need for byte swapping any more...
 292 /*      WriteLog("cdi: byte swapping boot code\n");
 293
 294         for(uint32 i=0; i<(cdi_code_length >> 1); i++)
 295         {
 296                 uint16 sdata = data16[i];
 297                 sdata = (sdata >> 8) | (sdata << 8);
 298                 data16[i] = sdata;
 299         }*/
 300
 301         return (uint8 *)data16;
 302 }
 303
 304 void cdi_load_sector(uint32 sector, uint8 * buffer)
 305 {
 306         if (sector == 0xFFFFFFFF)
 307         {
 308                 memset(buffer, 0x00, 2352);
 309                 return;
 310         }
 311
 312         sector *= 2352;
 313
 314         lseek(cdi_fp, 2+sector, SEEK_SET);
 315         read(cdi_fp, buffer, 2352);
 316
 317 //This is probably not needed any more...
 318 /*      // byte swap
 319         for (uint32 i=0;i<2352;i+=2)
 320         {
 321                 uint8 sdata=buffer[i+0];
 322                 buffer[i+0]=buffer[i+1];
 323                 buffer[i+1]=sdata;
 324         }*/
 325 }