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#ifndef BPB_H
#define BPB_H
#include <stdint.h>
#include "sassert.h"
#define DOS_BPB_OFFSET_ON_DISK 0x0B
typedef _Packed struct DOS_BPB_DOS3
{
/** Number of bytes per sector. */
uint16_t bytesPerSector;
/** Number of sectors per cluster. Must be power of 2. */
uint8_t sectorsPerCluster;
/** Number of reserved sectors. */
uint16_t reservedSectors;
/** Number of FATs. */
uint8_t numberOfFATs;
/** Maximum number of entries in the root directory. */
uint16_t rootDirEntries;
/** Total number of sectors on the drive. If drive larger than 32MB, this field is zero, see numberOfSectorsLarge. */
uint16_t numberOfSectors;
/** Media descriptor byte. */
uint8_t mediaType;
/** Number of sectors used by a FAT. */
uint16_t sectorsPerFAT;
/** Number of sectors per track. */
uint16_t sectorsPerTrack;
/** Number of heads. */
uint16_t numberOfHeads;
/** Number of hidden sectors on the drive, from the start of the drive. */
uint32_t hiddenSectors;
/** Number of sectors, only used if drive > 32MB. */
uint32_t numberOfSectorsLarge;
} DOS_BPB_DOS3;
STATIC_ASSERT(sizeof(DOS_BPB_DOS3) == 25);
typedef _Packed struct DOS_BPB_DOS4
{
struct DOS_BPB_DOS3;
uint8_t physicalDriveNumber;
uint8_t flags;
uint8_t extendedBootSignature;
uint32_t volumeSerialNumber;
char volumeLabel[11];
char fsType[8];
} DOS_BPB_DOS4;
STATIC_ASSERT(sizeof(DOS_BPB_DOS4) == 25 + 26);
typedef _Packed struct DOS_BPB_FAT32
{
struct DOS_BPB_DOS3;
uint32_t sectorPerFatLarge;
uint16_t extendedFlags;
uint16_t version;
uint32_t rootDirCluster;
uint16_t infoSector;
uint16_t backupBootSector;
char bootFileName[12];
uint8_t physicalDriveNumber;
uint8_t flags;
uint8_t extendedBootSignature;
uint32_t volumeSerialNumber;
char volumeLabel[11];
char fsType[8];
} DOS_BPB_FAT32;
STATIC_ASSERT(sizeof(DOS_BPB_FAT32) == 25 + 54);
/** Union of all BPB types. Default is DOS4 / FAT16. */
typedef union DOS_BPB
{
struct DOS_BPB_DOS3;
struct DOS_BPB_DOS4 fat16;
struct DOS_BPB_FAT32 fat32;
} DOS_BPB;
typedef enum DOS_BPB_MEDIA_TYPE
{
DOS_BPB_MEDIA_HDD = 0xF8
} DOS_BPB_MEDIA_TYPE;
#endif // BPB_H
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