Function test_FAT

src/fat.c:556–881

*/

int test_FAT(disk_t *disk_car, const struct fat_boot_sector *fat_header, const partition_t *partition, const int verbose, const int dump_ind)
{
  uint64_t start_fat1;
  uint64_t start_fat2;
  uint64_t start_rootdir;
  uint64_t start_data;
  uint64_t part_size;
  uint64_t end_data;
  unsigned long int no_of_cluster;
  unsigned long int fat_length;
  unsigned long int fat_length_calc;
  const char *buffer=(const char*)fat_header;
  if(!(le16(fat_header->marker)==0xAA55
        && (fat_header->ignored[0]==0xeb || fat_header->ignored[0]==0xe9)
        && (fat_header->fats==1 || fat_header->fats==2)))
    return 1;   /* Obviously not a FAT */
#ifndef DISABLED_FOR_FRAMAC
  if(verbose>1 || dump_ind!=0)
  {
    log_trace("test_FAT\n");
    log_partition(disk_car, partition);
  }
#endif
  if(dump_ind!=0)
    dump_log(fat_header, DEFAULT_SECTOR_SIZE);
  if(!((fat_header->ignored[0]==0xeb && fat_header->ignored[2]==0x90)||fat_header->ignored[0]==0xe9))
  {
#ifndef DISABLED_FOR_FRAMAC
    screen_buffer_add(msg_CHKFAT_BAD_JUMP);
    log_error(msg_CHKFAT_BAD_JUMP);
#endif
    return 1;
  }
  switch(fat_header->sectors_per_cluster)
  {
    case 1:
    case 2:
    case 4:
    case 8:
    case 16:
    case 32:
    case 64:
    case 128:
      break;
    default:
#ifndef DISABLED_FOR_FRAMAC
      screen_buffer_add(msg_CHKFAT_SECT_CLUSTER);
      log_error(msg_CHKFAT_SECT_CLUSTER);
#endif
      return 1;
  }
  switch(fat_header->fats)
  {
    case 1:
#ifndef DISABLED_FOR_FRAMAC
      screen_buffer_add("check_FAT: Unusual, only one FAT\n");
      log_warning("check_FAT: Unusual, only one FAT\n");
#endif