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#ifndef _FAT16_H
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#define _FAT16_H
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//________________________________________________________________________________________________________________________________________
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// 
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// Definitions
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//                              
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//________________________________________________________________________________________________________________________________________
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#define FILE_MAX_OPEN   4                               // The number of files that can accessed simultaneously. 
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#define SEEK_SET        0
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#define SEEK_CUR        1
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#define SEEK_END        2
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#define EOF     (-1) 
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#define BYTES_PER_SECTOR        512
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/*
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________________________________________________________________________________________________________________________________________
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        Structure of a filepointer
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________________________________________________________________________________________________________________________________________
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*/
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typedef struct
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{
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        u32 FirstSectorOfFirstCluster;  // First sector of the first cluster of the file.
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        u32 FirstSectorOfCurrCluster;   // First sector of the cluster which is edited at the moment.
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        u32 FirstSectorOfLastCluster;   // First sector of the last cluster of the file
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        u8      SectorOfCurrCluster;            // The sector within the current cluster.
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        u16 ByteOfCurrSector;                   // The byte location within the current sector.
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        u8      Mode;                                           // Mode of fileoperation (read,write)
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        u32 Size;                                               // The size of the opend file in bytes.
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        u32 Position;                                   // Pointer to a character within the file 0 < fileposition < filesize
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        u32 DirectorySector;                    // the sectorposition where the directoryentry has been made.
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        u16     DirectoryIndex;                         // The index to the directoryentry within the specified sector.
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        u8      Attribute;                                      // The attribute of the file opened.
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        u8  Cache[BYTES_PER_SECTOR];    // Cache for read and write operation from or to the sd-card.
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        u32 SectorInCache;                              // The last sector read, which is still in the sector cache.
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        u8      State;                                          // State of the filepointer (used/unused/...) 
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} File_t;
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// attribute definitions          
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#define ATTR_NONE               0x00    // normal file
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#define ATTR_READONLY           0x01    // file is readonly
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#define ATTR_HIDDEN                     0x02    // file is hidden
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#define ATTR_SYSTEM                     0x04    // file is a system file
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#define ATTR_VOLUMELABEL        0x08    // entry is a volume label
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#define ATTR_LONG_FILENAME      0x0F    // this is a long filename entry
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#define ATTR_SUBDIRECTORY       0x10    // entry is a directory name
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#define ATTR_ARCHIVE            0x20    // file is new or modified
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#define ATTR_ANY_FILE           0x3F    // all files
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//________________________________________________________________________________________________________________________________________
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//
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//      Structure of an item used by functions findfirst and findnext
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//________________________________________________________________________________________________________________________________________
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typedef struct
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{
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        File_t  fp;                                             // filepointer used to get access to the filesystemstructure
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        s8              searchstring[12];               // findfirst and findnext will only return elements within the specified directory matching this searchstring (8+3 + Terminator).
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        s8              name[13];                               // the name of the element found within the specified directory
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        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 
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        u8              attribfilter;                  
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        u8              attribmask;
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} __attribute__((packed)) Find_t;
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typedef struct
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{
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        u8      IsValid;                                // 0 means invalid, else valid
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        u8      SectorsPerCluster;              // how many sectors does a cluster contain?
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        u8      FatCopies;                              // Numbers of copies of the FAT
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        u16     MaxRootEntries;                 // Possible number of entries in the root directory.
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        u16     SectorsPerFat;                  // how many sectors does a fat16 contain?
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        u32 FirstFatSector;                     // sector of the start of the fat
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        u32 FirstRootDirSector;         // sector of the rootdirectory
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        u32 FirstDataSector;            // sector of the first cluster containing data (cluster2).
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        u32 LastDataSector;                     // the last data sector of the partition
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        u8  VolumeLabel[12];        // the volume label
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        u32     CurrentWorkingDirectory;// A pointer to the directory we are actual using
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        s8      PathToCwd[256];                 // a string containing the complete path to the current working directory
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}   __attribute__((packed)) Partition_t;
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extern Partition_t      Partition;              // Structure holds partition information
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//________________________________________________________________________________________________________________________________________
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// 
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// API to the FAT16 filesystem
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//                              
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//________________________________________________________________________________________________________________________________________
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// File System Funtions
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u8              Fat16_Init(void);
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u8              Fat16_Deinit(void);
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u8              Fat16_IsValid(void);
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s8*             FAT16_GetVolumeLabel(void);
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// File Function        
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File_t *fopen_(s8* const filename, const s8 mode);
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s16     fclose_(File_t * const file);
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u8              fexist_(s8* const filename);
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s16             fflush_(File_t * const file);
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s16     fseek_(File_t * const file, s32 offset, s16 origin);
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s16             fgetc_(File_t * const file);
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s16             fputc_(s8 c, File_t * const file);
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u32     fread_(void *buffer, u32 size, u32 count, File_t * const file);
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u32     fwrite_(void *buffer, u32 size, u32 count, File_t * const file);
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s16             fputs_(s8 * const string, File_t * const file);
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s8 *    fgets_(s8 * const string, s16 length, File_t * const file);
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u8              feof_(File_t * const file);
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u8              fdelete_(s8* const filepath);
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// Directory Functions
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s8              *getcwd_(void);
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u8              findfirst_(const s8* name, u8 attribmask, Find_t *);
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u8              findnext_(Find_t *);
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u8              chdir_(s8* const dirpath);
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u8              mkdir_(s8* const dirpath);
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u8              rmdir_(s8* const dirpath);
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#endif //_FAT16_H
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