#ifndef _fat_h_
#define _fat_h_

//Block Size in Bytes
#define BlockSize			512

//Master Boot Record
#define MASTER_BOOT_RECORD	0

//BPB Address only in mmc card or usb disk
#define BIOS_PARAMETER_BLOCK	0

//Volume Boot Record location in Master Boot Record
#define VBR_ADDR 			0x1C6

//define ASCII
#define SPACE 				0x20
#define DIR_ENTRY_IS_FREE   0xE5
#define FIRST_LONG_ENTRY	0x01
#define SECOND_LONG_ENTRY	0x42

//define DIR_Attr
#define ATTR_LONG_NAME		0x0F
#define ATTR_READ_ONLY		0x01
#define ATTR_HIDDEN			0x02
#define ATTR_SYSTEM			0x04
#define ATTR_VOLUME_ID		0x08
#define ATTR_DIRECTORY		0x10
#define ATTR_ARCHIVE		0x20

#define	FAT_Flg_12			0x00
#define	FAT_Flg_16			0x01
#define	FAT_Flg_32			0x02

//fat32 BPB結(jié)構(gòu)，包括擴(kuò)展BPB
struct BootSec32 
{
	unsigned char	BS_jmpBoot[3];	//jmp code
	unsigned char	BS_OEMName[8];	//oem and os like dos5.0
	unsigned int	BPB_BytesPerSec; //扇區(qū)字節(jié)數(shù)
	unsigned char	BPB_SecPerClus;	//每簇扇區(qū)數(shù)
	unsigned int	BPB_RsvdSecCnt; //保留扇區(qū)數(shù)
	unsigned char	BPB_NumFATs;	//FAT數(shù)目
	unsigned int	BPB_RootEntCnt; //根目錄項數(shù) 0
	unsigned int	BPB_TotSec16; 	//小扇區(qū)總數(shù) 0
	unsigned char	BPB_Media;		//媒體描述符
	unsigned int	BPB_FATSz16; 	//每FAT扇區(qū)數(shù)fat32不用為0
	unsigned int	BPB_SecPerTrk; 	//每道扇區(qū)數(shù)
	unsigned int	BPB_NumHeads; 	//磁頭數(shù)
	unsigned long	BPB_HiddSec; 	//隱藏扇區(qū)數(shù)
	unsigned long	BPB_TotSec32; 	//總扇區(qū)數(shù)
	unsigned long	BPB_FATSz32;	//每FAT扇區(qū)數(shù)fat32
	unsigned int	BPB_ExtFlag;	//fat32擴(kuò)展標(biāo)志
	unsigned int	BPB_FileSysVer;	//fat32文件系統(tǒng)版本
	unsigned long	BPB_RootCluNum;	//根目錄簇號
	unsigned int	BPB_FileSysInf;	//文件系統(tǒng)信息扇區(qū)號
	unsigned int	BPB_BootBack;	//引導(dǎo)扇區(qū)備份號
	unsigned char	BPB_Rsvd[12];	//保留空間
	unsigned char	BPB_PhyDriNum;	//物理驅(qū)動器號
	unsigned char	BPB_Rsvd1;		//保留
	unsigned char	BPB_ExtBootSig;	//擴(kuò)展引導(dǎo)標(biāo)簽
	unsigned long	BPB_VolumeSer;	//分區(qū)序號
	unsigned char	BPB_VolumeLab[11];	//卷標(biāo)
	unsigned char	BPB_SysID[8];	//系統(tǒng)ID
};

//fat12/16 BPB結(jié)構(gòu)，包括擴(kuò)展BPB
struct BootSec
{
	unsigned char	BS_jmpBoot[3];	//jmp code					0x00
	unsigned char	BS_OEMName[8];	//oem and os like dos5.0	0x03
	unsigned int	BPB_BytesPerSec; //扇區(qū)字節(jié)數(shù)				0x0B
	unsigned char	BPB_SecPerClus;	//每簇扇區(qū)數(shù)				0x0D
	unsigned int	BPB_RsvdSecCnt; //保留扇區(qū)數(shù)				0x0E
	unsigned char	BPB_NumFATs;	//FAT數(shù)目					0x10
	unsigned int	BPB_RootEntCnt; //根目錄項數(shù) 512			0x11
	unsigned int	BPB_TotSec16; 	//小扇區(qū)總數(shù) <65536時使用	0x13
	unsigned char	BPB_Media;		//媒體描述符				0x15
	unsigned int	BPB_FATSz16; 	//每FAT扇區(qū)數(shù)				0x16
	unsigned int	BPB_SecPerTrk; 	//每道扇區(qū)數(shù)				0x18
	unsigned int	BPB_NumHeads; 	//磁頭數(shù)
	unsigned long	BPB_HiddSec; 	//隱藏扇區(qū)數(shù)
	unsigned long	BPB_TotSec32; 	//大扇區(qū)數(shù) 當(dāng)小扇區(qū)數(shù)為0時使用這里
	unsigned char	BPB_PhyDriNum;	//物理驅(qū)動器號
	unsigned char	BPB_Rsvd1;		//保留
	unsigned char	BPB_ExtBootSig;	//擴(kuò)展引導(dǎo)標(biāo)簽
	unsigned long	BPB_VolumeSer;	//卷序號
	unsigned char	BPB_VolumeLab[11];	//卷標(biāo)
	unsigned char	BPB_SysID[8];	//系統(tǒng)ID
};

struct DirEntry
{
	unsigned char	DIR_Name[11];     //文件名，沒有.
	unsigned char	DIR_Attr;         //文件屬性，自低至高，只讀、隱藏、系統(tǒng)、卷標(biāo)、子目錄、歸檔
	unsigned char	DIR_NTRes;        //系統(tǒng)保留
	unsigned char	DIR_CrtTimeTenth; //創(chuàng)建時間的10毫秒位
	unsigned int	DIR_CrtTime;      //創(chuàng)建時間
	unsigned int	DIR_CrtDate;      //創(chuàng)建日期
	unsigned int	DIR_LastAccDate;  //最后訪問日期
	unsigned int	DIR_FstClusHI;    //文件起始簇號高16位               
	unsigned int	DIR_WrtTime;      //最近修改時間
	unsigned int	DIR_WrtDate;      //最近修改日期
	unsigned int	DIR_FstClusLO;    //文件起始簇號的低16位               
	unsigned long	DIR_FileSize;     //文件長度
};

unsigned int fat_read_dir_ent(unsigned long dir_cluster,unsigned char Entry_Count,unsigned long *Size,unsigned char *Dir_Attrib,unsigned char *buff);
unsigned char fat_search_file (unsigned char *File_Name,unsigned long *Cluster,unsigned long *Size,unsigned char *Dir_Attrib,unsigned char *buff);
unsigned char fat_read_file(unsigned int Cluster,unsigned char *buff,unsigned long BlockCount,unsigned char *blockserial);
void fat_load(unsigned long Cluster,unsigned long *Block,unsigned char *TMP_Buffer);

#endif