#ifndef __FAT_H__
#define __FAT_H__

typedef struct {
    unsigned char   Drive;  //useless
    unsigned char   FlagsNT;
    unsigned char   Signature;  // 0x28 or 0x29
    unsigned        SerialNumber;
    char            VolumeLabel[11];
    char            SysIDString[8];    // unreliable
} __attribute__((packed)) BPB_EXT_16;


typedef struct {
    unsigned        SectorsPerFAT;
    unsigned short  Flags;
    unsigned short  Version;
    unsigned        ClusterOfRootDirectory;
    unsigned short  ClusterOfFSInfo;
    unsigned short  ClusterOfBackupBootSector;
    unsigned char   Reserved[12];   // Should be 0 at format
    unsigned char   Drive;
    unsigned char   FlagsNT;
    unsigned char   Signature;  // 0x28 or 0x29
    unsigned        SerialNumber;
    char            VolumeLabel[11];
    char            SysIDString[8]; // always FAT12

} __attribute__((packed)) BPB_EXT_32;


typedef struct {
    unsigned char   _ignore[3];

    // Bios Parameter Block
    char            OEMIdentify[8];
    unsigned short  BytesPerSector;
    unsigned char   SectorsPerCluster;
    unsigned short  ReservedSectors;
    unsigned char   NumberOfFATs;
    unsigned short  NumberOfDirectoryEntries;
    unsigned short  NumberOfSectors;
    unsigned char   MediaDescriptorType;
    unsigned short  SectorsPerFAT;
    unsigned short  SectorsPerTrack;
    unsigned short  HeadsPerCylinder;
    unsigned        HiddenSectors;
    unsigned        NumberOfSectorsLong;
    
    union {
        BPB_EXT_16 Ext16;
        BPB_EXT_32 Ext32;
    } Extended;

} __attribute__((packed)) FATBootSector, *FATBootSectorPointer;


typedef struct {
    unsigned NumberOfSectors;
    unsigned SizeOfSector;
    unsigned FatOffset;
    unsigned NumberOfRootEntries;
    unsigned RootOffset;
    unsigned SizeOfRoot;
    unsigned SizeOfFat;
    unsigned SizeOfFatEntry;
    unsigned SizeOfCluster;
    void     (*ReadSector)  (void* buffer, int lba);
} FatMountInfo, *FatMountInfoPointer;


typedef struct {
    char            FileName[8];
    char            Extension[3];
    unsigned char   Atributes;
    unsigned char   Reserved;
    unsigned char   CreateTimeFine;
    unsigned short  CreateTime;
    unsigned short  CreateDate;
    unsigned short  LastAccessedDate;
    unsigned short  EAIndex;
    unsigned short  LastModifiedTime;
    unsigned short  LastModifiedDate;
    unsigned short  FirstCluster;
    unsigned        FileSize;
} __attribute__((packed)) FatDirectoryEntry, *FatDirectoryEntryPointer;

    
extern FatMountInfo FloppyMount(int drive);

#endif