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/FollowMe/fat16.h
0,0 → 1,267
#ifndef __fat16_h
#define __fat16_h
 
 
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Userspecific definitions
//
//________________________________________________________________________________________________________________________________________
 
#define __MAX_FILES_USED 1 // The number of files that can be opened simultaneously.
 
 
 
 
 
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Datatype definitions
//
//________________________________________________________________________________________________________________________________________
 
typedef unsigned char u8;
typedef signed char s8;
typedef unsigned short u16;
typedef signed short s16;
typedef unsigned long u32;
typedef signed long s32;
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Structure of a filepointer
//
//________________________________________________________________________________________________________________________________________
 
#define _UNUSED 1 // Bits used in the attribute of an directory entry.
#define _USED 2
#define _ARCHIVE 2
#define _READ_ONLY 4
#define _SYSTEM 8
#define _DIRECTORY 16
#define _FILE 32
 
 
typedef struct afile
{
u32 start_cluster; // Sectorpointer to the first sector of the first datacluster of the file.
u32 cluster_pointer; // Pointer to the cluster which is edited at the moment.
u8 sector_index; // The sector which is edited at the moment (cluster_pointer + sector_index).
u16 byte_index; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index).
u8 mode; // mode of fileoperation (read,write)
u32 filesize; // the size of the opend file in bytes.
u32 fileposition; // pointer to a character within the file 0 < fileposition < filesize
u32 sector_in_buffer; // the last sector read, wich is still in the sectorbuffer.
u32 directory_root_sector; // pointer to the root of the
u32 directory_sector; // the sectorposition where the directoryentry has been made.
u8 directory_index; // the index to the directoryentry within the specified sector.
u8 attribute; // the attribute of the file opened.
u8 buffer[512]; // Buffer for read and write operation from or to the mmc.
u8 state; // state of the filepointer (used/unused/...)
} File;
 
//________________________________________________________________________________________________________________________________________
//
// Structure of an item to find within the cwd
//
//________________________________________________________________________________________________________________________________________
 
typedef struct find
{
u8 name[12]; // filename + extension or directoryname of the item found within the cwd.
u8 searchstring[13];
u32 cluster_pointer; // Sectorpointer to the sector of the item searched within the cwd.
u16 startcluster; // pointer to the first datacluster of the item found in the cwd.
u32 filesize; // the size of the opend file in bytes.
u32 directory_sector; // the sector within the actual cluster where the directoryentry was found.
u8 directory_index; // the index to the directoryentry within the specified sector.
u8 attribute; // the attribute of the file opened.
} Find;
 
//________________________________________________________________________________________________________________________________________
//
// Directoryentries
//
//________________________________________________________________________________________________________________________________________
 
 
 
struct DirEntry
{
u8 name[8]; // 8 bytes name.
u8 extension[3]; // 3 bytes extension.
u8 attribute; // attribute of the directory entry (unused,archive,read-only,system,directory,volume)
u8 reserved[10]; // reserved bytes within the directory entry.
u16 time; // time and
u16 date; // date of last write acces to the file or directory.
u16 startcluster; // first cluster of the file or directory.
u32 size; // size of the file or directory in bytes.
} __attribute__((packed));
 
//________________________________________________________________________________________________________________________________________
//
// Structure of an entry within the fileallocationtable.
//
//________________________________________________________________________________________________________________________________________
 
struct FatEntry
{
u16 next_cluster; // the next cluster of the file.
} __attribute__((packed));
 
 
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Partitions
//
//________________________________________________________________________________________________________________________________________
 
#define _EMPTY 0x00
#define _FAT12 0x01
#define _FAT16_ST_32_MB 0x04
#define _EXTENDED 0x05
#define _FAT16_LT_32_MB 0x06
#define _HPFS 0x07
#define _FAT32 0x0B
#define _FAT32_BIOS_Extension 0x0C
#define _FAT16_32_MB_BIOS_Extension 0x0E
#define _EXTENDED_BIOS_Extension 0x0F
#define _EISA 0x12
#define _DYNAMIC 0x42
#define _Linux_Swap 0x82
#define _Linux_Native 0x83
#define _Linux_LVM 0x8E
#define _FreeBSD 0xA5
#define _OpenBSD 0xA6
#define _NetBSD 0xA9
 
 
struct PartitionEntry
{
u8 PartitionState;
u8 BeginningHead;
u16 BeginningCylinder;
u8 Type;
u8 EndHead;
u16 EndCylinder;
u32 NoSectorsBeforePartition;
u32 NoSectorsPartition ;
} __attribute__((packed));
 
 
//________________________________________________________________________________________________________________________________________
//
// Structure of the VolumeBootRecord
//
//________________________________________________________________________________________________________________________________________
 
struct VBR_Entry
{
u8 dummy[11];
u16 bps;
u8 SectorsPerCluster;
u16 ReservedSectors;
u8 NoFATCopies;
u16 MaxRootEntries;
u16 dummy2;
u8 dummy3;
u16 SectorsPerFAT;
} __attribute__((packed));
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Structure of the MasterBootRecord
//
//________________________________________________________________________________________________________________________________________
 
#define _MBR_SECTOR 0 // The MasterBootRecord is located in sector 0
 
struct MBR_Entry
{
u8 ExecutableCode[446];
struct PartitionEntry PartitionEntry1;
struct PartitionEntry PartitionEntry2;
struct PartitionEntry PartitionEntry3;
struct PartitionEntry PartitionEntry4;
u16 ExecutableMarker;
} __attribute__((packed));
 
 
 
 
//________________________________________________________________________________________________________________________________________
//
// API to the FAT16 filesystem
//
//________________________________________________________________________________________________________________________________________
 
extern u8 FAT16_Init(void);
extern File * fopen_(s8 *fname,s8 mode);
extern s16 fflush_(File *file);
extern void fclose_(File *file);
extern u32 fread_(void *buffer, u32 size, u32 count, File *file);
extern u32 fwrite_(void *buffer, u32 size, u32 count, File *file);
extern s16 fseek_(File *file, s32 offset, s16 origin);
extern s16 fgetchar_(File *file);
extern u8 fputchar_(File *file,s8 c);
extern u8 fputs_(File *file,s8 *string);
extern s8 * fgets_(s8 *s, s16 count, File *file);
extern s16 frename_(s8 *oldname, s8 *newname);
extern u8 fexist_(s8*fname);
extern u8 mkdir_(s8*fname);
extern u8 chdir_(s8 *fname);
extern u8 findfirst_(s8 *fname, Find *item, u8 attribute);
extern u8 findnext_(Find *item);
 
 
 
//________________________________________________________________________________________________________________________________________
//
// Functions needed internaly for the fat16 implementation
//
//________________________________________________________________________________________________________________________________________
 
extern u8 SeekFileInDirectory(s8*fname, File *file);
extern u8 CreateFileInDirectory(s8*fname, File *file);
extern u16 FindNextFreeCluster(File *file);
extern void SeperateFileName(s8*fname, s8*name);
extern u8 ScanSubDirectories(s8*fname, File *file);
extern u16 GetNextCluster(File *file);
extern u8 AppendCluster(File *file);
extern u16 GetFatClusterOffset(File *file);
extern u16 GetFatSectorIndex(File *file);
extern File * ReserveFilePointer(void);
extern u16 SeekSubDirectory(s8 *fname);
extern u8 CreateSubDirectory_(s8 *fname);
extern u8 FindItem(Find *);
extern void FreeFilePointer(File *file);
 
//________________________________________________________________________________________________________________________________________
//
// Vaiables needed internaly for the fat16 implementation
//
//________________________________________________________________________________________________________________________________________
 
extern u8 SectorsPerCluster;
extern u32 CWD;
 
 
 
#endif