cf_fat.h

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#include <inttypes.h>

#define FS_ERR_NOERR		0x00
#define FS_ERR_MEDIAERR		0x01
#define FS_ERR_UNFORMAT		0x02
#define FS_ERR_NOTFAT		0x03
#define FS_ERR_UNKNOWNFAT	0x04
#define FS_ERR_NOTFOUND		0x81
#define FS_ERR_SEEKERR		0x82
#define FS_ERR_NORAM		0xff

#define FS_TYPE_FAT12		0x00
#define FS_TYPE_FAT16		0x01
#define FS_TYPE_FAT32		0x02
#define FS_TYPE_OTHER		0xff

#define FS_FAT32_EOF		0x0ffffff8
#define FS_FAT16_EOF		0xfff8
#define FS_FAT12_EOF		0xff8

typedef struct
{
	uint8_t Type;
	uint8_t StartLBA;
	uint8_t SectorsPerCluster;
	uint8_t LShift;
	uint16_t SectorsBeforeFAT;
	uint8_t	FATs;
	uint16_t FAT16RootEntries;
	uint32_t TotalSectors;
	uint16_t SectorsPerFAT;
	uint32_t FAT32RootStartCluster;
} FS_TBPB;

typedef struct
{
	uint32_t StartLBA;
	uint8_t LShift;
	uint32_t DataStartLBA;
} FS_TFAT;

typedef struct
{
	uint8_t Attrib;
	uint32_t StartCluster;
	uint32_t StartLBA;
	uint32_t CurrentCluster;
	uint32_t CurrentLBA;
	uint32_t *ClusterChain;
	uint32_t Offset;
	uint32_t Length;
} FS_TFile;

FS_TBPB FS_BPB;
FS_TFAT FS_FAT;
FS_TFile FS_RootDir, FS_CurrentDir;

uint8_t FS_Initialize(void);
uint8_t FS_ChangeDir(char *DirName);
uint8_t FS_Open(FS_TFile *F, char *FileName);
void FS_Close(FS_TFile *F);
uint8_t FS_Seek(FS_TFile *F, uint32_t off);
uint32_t FS_Read(FS_TFile *F, char *buf, uint32_t count);
void FS_FastBlockRead(FS_TFile *F, char *buf, uint8_t sectors);
void FS_GetClusterChain(FS_TFile *F, uint32_t *chain);