/*---------------------------------------------------------------------------/
/  Petit FatFs - FAT file system module include file  R0.01a   (C)ChaN, 2010
/----------------------------------------------------------------------------/
/ Petit FatFs module is an open source software to implement FAT file system to
/ small embedded systems. This is a free software and is opened for education,
/ research and commercial developments under license policy of following trems.
/
/  Copyright (C) 2010, ChaN, all right reserved.
/
/ * The Petit FatFs module is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/----------------------------------------------------------------------------*/

#include "integer.h"

/*---------------------------------------------------------------------------/
/ Petit FatFs Configuration Options
/
/ CAUTION! Do not forget to make clean the project after any changes to
/ the configuration options.
/
/----------------------------------------------------------------------------*/
#ifndef _FATFS
#define _FATFS

#define _WORD_ACCESS	0
/* The _WORD_ACCESS option defines which access method is used to the word
/  data in the FAT structure.
/
/   0: Byte-by-byte access. Always compatible with all platforms.
/   1: Word access. Do not choose this unless following condition is met.
/
/  When the byte order on the memory is big-endian or address miss-aligned
/  word access results incorrect behavior, the _WORD_ACCESS must be set to 0.
/  If it is not the case, the value can also be set to 1 to improve the
/  performance and code efficiency. */


#define	_USE_DIR	0
/* To enable pf_opendir and pf_readdir function, set _USE_DIR to 1. */


#define	_USE_LSEEK	0
/* To enable pf_lseek function, set _USE_LSEEK to 1. */


#define _FS_FAT32	1
/* To enable FAT32 support, set _FS_FAT32 to 1. */


/* End of configuration options. Do not change followings without care.     */
/*--------------------------------------------------------------------------*/


#if _FS_FAT32
#define	CLUST	DWORD
#else
#define	CLUST	WORD
#endif


/* File system object structure */

typedef struct _FATFS_ {
	BYTE	fs_type;	/* FAT sub type */
	BYTE	csize;		/* Number of sectors per cluster */
	BYTE	flag;		/* File status flags */
	BYTE	csect;		/* File sector address in the cluster */
	WORD	n_rootdir;	/* Number of root directory entries (0 on FAT32) */
	BYTE*	buf;		/* Pointer to the disk access buffer */
	CLUST	max_clust;	/* Maximum cluster# + 1. Number of clusters is max_clust - 2 */
	DWORD	fatbase;	/* FAT start sector */
	DWORD	dirbase;	/* Root directory start sector (Cluster# on FAT32) */
	DWORD	database;	/* Data start sector */
	DWORD	fptr;		/* File R/W pointer */
	DWORD	fsize;		/* File size */
	CLUST	org_clust;	/* File start cluster */
	CLUST	curr_clust;	/* File current cluster */
	DWORD	dsect;		/* File current data sector */
} FATFS;



/* Directory object structure */

typedef struct _DIR_ {
	WORD	index;		/* Current read/write index number */
	BYTE*	fn;			/* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
	CLUST	sclust;		/* Table start cluster (0:Static table) */
	CLUST	clust;		/* Current cluster */
	DWORD	sect;		/* Current sector */
} DIR;



/* File status structure */

typedef struct _FILINFO_ {
	DWORD	fsize;		/* File size */
	WORD	fdate;		/* Last modified date */
	WORD	ftime;		/* Last modified time */
	BYTE	fattrib;	/* Attribute */
	char	fname[13];	/* File name */
} FILINFO;



/* File function return code (FRESULT) */

typedef enum {
	FR_OK = 0,			/* 0 */
	FR_DISK_ERR,		/* 1 */
	FR_NOT_READY,		/* 2 */
	FR_NO_FILE,			/* 3 */
	FR_NO_PATH,			/* 4 */
	FR_INVALID_NAME,	/* 5 */
	FR_STREAM_ERR,		/* 6 */
	FR_INVALID_OBJECT,	/* 7 */
	FR_NOT_ENABLED,		/* 8 */
	FR_NO_FILESYSTEM	/* 9 */
} FRESULT;



/*--------------------------------------------------------------*/
/* Petit FatFs module application interface                     */

FRESULT pf_mount (FATFS*);				/* Mount/Unmount a logical drive */
FRESULT pf_open (const char*);			/* Open a file */
FRESULT pf_read (void*, WORD, WORD*);	/* Read data from a file */
FRESULT pf_lseek (DWORD);				/* Move file pointer of a file object */
FRESULT pf_opendir (DIR*, const char*);	/* Open an existing directory */
FRESULT pf_readdir (DIR*, FILINFO*);	/* Read a directory item */



/*--------------------------------------------------------------*/
/* Flags and offset address                                     */

/* File status flag (FATFS.flag) */

#define	FA_READ		0x01
#define	FA_STREAM	0x40
#define	FA__ERROR	0x80


/* FAT sub type (FATFS.fs_type) */

#define FS_FAT12	1
#define FS_FAT16	2
#define FS_FAT32	3


/* File attribute bits for directory entry */

#define	AM_RDO	0x01	/* Read only */
#define	AM_HID	0x02	/* Hidden */
#define	AM_SYS	0x04	/* System */
#define	AM_VOL	0x08	/* Volume label */
#define AM_LFN	0x0F	/* LFN entry */
#define AM_DIR	0x10	/* Directory */
#define AM_ARC	0x20	/* Archive */
#define AM_MASK	0x3F	/* Mask of defined bits */


/* FatFs refers the members in the FAT structures with byte offset instead
/ of structure member because there are incompatibility of the packing option
/ between various compilers. */

#define BS_jmpBoot			0
#define BS_OEMName			3
#define BPB_BytsPerSec		11
#define BPB_SecPerClus		13
#define BPB_RsvdSecCnt		14
#define BPB_NumFATs			16
#define BPB_RootEntCnt		17
#define BPB_TotSec16		19
#define BPB_Media			21
#define BPB_FATSz16			22
#define BPB_SecPerTrk		24
#define BPB_NumHeads		26
#define BPB_HiddSec			28
#define BPB_TotSec32		32
#define BS_55AA				510

#define BS_DrvNum			36
#define BS_BootSig			38
#define BS_VolID			39
#define BS_VolLab			43
#define BS_FilSysType		54

#define BPB_FATSz32			36
#define BPB_ExtFlags		40
#define BPB_FSVer			42
#define BPB_RootClus		44
#define BPB_FSInfo			48
#define BPB_BkBootSec		50
#define BS_DrvNum32			64
#define BS_BootSig32		66
#define BS_VolID32			67
#define BS_VolLab32			71
#define BS_FilSysType32		82

#define MBR_Table			446

#define	DIR_Name			0
#define	DIR_Attr			11
#define	DIR_NTres			12
#define	DIR_CrtTime			14
#define	DIR_CrtDate			16
#define	DIR_FstClusHI		20
#define	DIR_WrtTime			22
#define	DIR_WrtDate			24
#define	DIR_FstClusLO		26
#define	DIR_FileSize		28



/*--------------------------------*/
/* Multi-byte word access macros  */

#if _WORD_ACCESS == 1	/* Enable word access to the FAT structure */
#define	LD_WORD(ptr)		(WORD)(*(WORD*)(BYTE*)(ptr))
#define	LD_DWORD(ptr)		(DWORD)(*(DWORD*)(BYTE*)(ptr))
#define	ST_WORD(ptr,val)	*(WORD*)(BYTE*)(ptr)=(WORD)(val)
#define	ST_DWORD(ptr,val)	*(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
#else					/* Use byte-by-byte access to the FAT structure */
#define	LD_WORD(ptr)		(WORD)(((WORD)*(BYTE*)((ptr)+1)<<8)|(WORD)*(BYTE*)(ptr))
#define	LD_DWORD(ptr)		(DWORD)(((DWORD)*(BYTE*)((ptr)+3)<<24)|((DWORD)*(BYTE*)((ptr)+2)<<16)|((WORD)*(BYTE*)((ptr)+1)<<8)|*(BYTE*)(ptr))
#define	ST_WORD(ptr,val)	*(BYTE*)(ptr)=(BYTE)(val); *(BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8)
#define	ST_DWORD(ptr,val)	*(BYTE*)(ptr)=(BYTE)(val); *(BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8); *(BYTE*)((ptr)+2)=(BYTE)((DWORD)(val)>>16); *(BYTE*)((ptr)+3)=(BYTE)((DWORD)(val)>>24)
#endif


#endif /* _FATFS */
