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#ifndef _FAT16_H
#define _FAT16_H


//________________________________________________________________________________________________________________________________________
//
// Definitions
//
//________________________________________________________________________________________________________________________________________

//#define               __USE_TIME_DATE_ATTRIBUTE
#define FILE_MAX_OPEN   3                               // The number of files that can accessed simultaneously.
#define SEEK_SET        0
#define SEEK_CUR        1
#define SEEK_END        2
#define EOF     (-1)
#define BYTES_PER_SECTOR        512
/*
________________________________________________________________________________________________________________________________________

        Structure of a filepointer
________________________________________________________________________________________________________________________________________
*/
typedef struct
{
        uint32_t        FirstSectorOfFirstCluster;      // First sector of the first cluster of the file.
        uint32_t        FirstSectorOfCurrCluster;       // First sector of the cluster which is edited at the moment.
        uint8_t         SectorOfCurrCluster;            // The sector within the current cluster.
        uint16_t        ByteOfCurrSector;                       // The byte location within the current sector.
        uint8_t         Mode;                                           // Mode of fileoperation (read,write)
        uint32_t        Size;                                           // The size of the opend file in bytes.
        uint32_t        Position;                                       // Pointer to a character within the file 0 < fileposition < filesize
        uint32_t        DirectorySector;                        // the sectorposition where the directoryentry has been made.
        uint16_t        DirectoryIndex;                         // The index to the directoryentry within the specified sector.
        uint8_t         Attribute;                                      // The attribute of the file opened.
        uint8_t         Cache[BYTES_PER_SECTOR];        // Cache for read and write operation from or to the sd-card.
        uint32_t        SectorInCache;                          // The last sector read, which is still in the sector cache.
        uint8_t         State;                                          // State of the filepointer (used/unused/...)
} File_t;

//________________________________________________________________________________________________________________________________________
//
// API to the FAT16 filesystem
//
//________________________________________________________________________________________________________________________________________

extern uint8_t          Fat16_Init(void);
extern uint8_t          Fat16_Deinit(void);
extern uint8_t          Fat16_IsValid(void);

extern File_t *         fopen_(int8_t * const filename, const int8_t mode);
extern int16_t          fclose_(File_t *file);
extern uint8_t          fexist_(int8_t * const filename);
extern int16_t          fflush_(File_t * const file);
extern int16_t          fseek_(File_t * const file, int32_t offset, int16_t origin);
extern int16_t          fgetc_(File_t * const file);
extern int16_t          fputc_(const int8_t c, File_t * const file);
extern uint32_t         fread_(void * const buffer, uint32_t size, uint32_t count, File_t * const file);
extern uint32_t         fwrite_(void *buffer, uint32_t size, uint32_t count, File_t *file);
extern int16_t          fputs_(int8_t * const string, File_t * const file);
extern int8_t *         fgets_(int8_t * const string, const int16_t length, File_t * const file);
extern uint8_t          feof_(File_t * const file);



#endif //_FAT16_H