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#ifndef _FAT16_H

#define _FAT16_H

//________________________________________________________________________________________________________________________________________

// 

// Definitions

//                              

//________________________________________________________________________________________________________________________________________

#define FILE_MAX_OPEN   4                               // 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

{

        u32 FirstSectorOfFirstCluster;  // First sector of the first cluster of the file.

        u32 FirstSectorOfCurrCluster;   // First sector of the cluster which is edited at the moment.

        u32 FirstSectorOfLastCluster;   // First sector of the last cluster of the file

        u8      SectorOfCurrCluster;            // The sector within the current cluster.

        u16 ByteOfCurrSector;                   // The byte location within the current sector.

        u8      Mode;                                           // Mode of fileoperation (read,write)

        u32 Size;                                               // The size of the opend file in bytes.

        u32 Position;                                   // Pointer to a character within the file 0 < fileposition < filesize

        u32 DirectorySector;                    // the sectorposition where the directoryentry has been made.

        u16     DirectoryIndex;                         // The index to the directoryentry within the specified sector.

        u8      Attribute;                                      // The attribute of the file opened.

        u8  Cache[BYTES_PER_SECTOR];    // Cache for read and write operation from or to the sd-card.

        u32 SectorInCache;                              // The last sector read, which is still in the sector cache.

        u8      State;                                          // State of the filepointer (used/unused/...) 

} File_t;

// attribute definitions          

#define ATTR_NONE               0x00    // normal file

#define ATTR_READONLY           0x01    // file is readonly

#define ATTR_HIDDEN                     0x02    // file is hidden

#define ATTR_SYSTEM                     0x04    // file is a system file

#define ATTR_VOLUMELABEL        0x08    // entry is a volume label

#define ATTR_LONG_FILENAME      0x0F    // this is a long filename entry

#define ATTR_SUBDIRECTORY       0x10    // entry is a directory name

#define ATTR_ARCHIVE            0x20    // file is new or modified

#define ATTR_ANY_FILE           0x3F    // all files

//________________________________________________________________________________________________________________________________________

//

//      Structure of an item used by functions findfirst and findnext

//________________________________________________________________________________________________________________________________________

typedef struct

{

        File_t  fp;                                             // filepointer used to get access to the filesystemstructure

        s8              searchstring[12];               // findfirst and findnext will only return elements within the specified directory matching this searchstring (8+3 + Terminator).

        s8              name[13];                               // the name of the element found within the specified directory

        u8              active;                                 // if the attribute active is set the name and the attributes of an element found within DirectoryEntryExist will be entered into the structure 

        u8              attribfilter;                  

        u8              attribmask;

} __attribute__((packed)) Find_t;

//________________________________________________________________________________________________________________________________________

// 

// API to the FAT16 filesystem

//                              

//________________________________________________________________________________________________________________________________________

// File System Funtions

u8              Fat16_Init(void);

u8              Fat16_Deinit(void);

u8              Fat16_IsValid(void);

s8*             FAT16_GetVolumeLabel(void);

// File Function        

File_t *fopen_(s8* const filename, const s8 mode);

s16     fclose_(File_t * const file);

u8              fexist_(s8* const filename);

s16             fflush_(File_t * const file);

s16     fseek_(File_t * const file, s32 offset, s16 origin);

s16             fgetc_(File_t * const file);

s16             fputc_(s8 c, File_t * const file);

u32     fread_(void *buffer, u32 size, u32 count, File_t * const file);

u32     fwrite_(void *buffer, u32 size, u32 count, File_t * const file);

s16             fputs_(s8 * const string, File_t * const file);

s8 *    fgets_(s8 * const string, s16 length, File_t * const file);

u8              feof_(File_t * const file);

u8              fdelete_(s8* const filepath);

// Directory Functions

s8              *getcwd_(void);

u8              findfirst_(const s8* name, u8 attribmask, Find_t *);

u8              findnext_(Find_t *);

u8              chdir_(s8* const dirpath);

u8              mkdir_(s8* const dirpath);

u8              rmdir_(s8* const dirpath);

#endif //_FAT16_H