?? fat.h
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#ifndef __FAT_H__
#define __FAT_H__
#include "COMM.H"
#include <string.h>
#define MSDOSFSROOT 0 // cluster 0 means the root dir
#define CLUST_FREE 0 // cluster 0 also means a free cluster
#define MSDOSFSFREE CLUST_FREE
#define CLUST_FIRST 2 // first legal cluster number
#define CLUST_RSRVD 0xfff6 // reserved cluster range
#define CLUST_BAD 0xfff7 // a cluster with a defect
#define CLUST_EOFS 0xfff8 // start of eof cluster range
#define CLUST_EOFE 0xffff // end of eof cluster range
//dir_clust:當前目錄簇號
//FileInfo: 文件指針
//type: 要瀏覽的文件類型
//返回值: 當前文件索引
//文件夾中 ".":代表當前目錄,"..":代表上一級目錄
//文件目錄項的文件屬性位
#define AM_RDO 0x01 //只讀文件
#define AM_HID 0x02 //隱藏文件
#define AM_SYS 0x04 //系統文件
#define AM_VOL 0x08 //卷標
#define AM_LFN 0x0F //長文件名字段
#define AM_DIR 0x10 //文件夾
#define AM_ARC 0x20 //歸檔文件
//使用packed 以字節分配.避免數據對齊的問題
typedef __packed struct // length 16 bytes
{
BYTE prIsActive; // 0x80 indicates active partition
BYTE prStartHead; // starting head for partition
WORD prStartCylSect; // starting cylinder and sector
BYTE prPartType; // partition type (see above)
BYTE prEndHead; // ending head for this partition
WORD prEndCylSect; // ending cylinder and sector
DWORD prStartLBA; // first LBA sector for this partition
DWORD prSize; // size of this partition (bytes or sectors ?)
}partrecord;
typedef __packed struct
{
BYTE psPartCode[512-64-2]; // pad so struct is 512b
BYTE psPart[64]; // four partition records (64 bytes)
BYTE psBootSectSig0; // two signature bytes (2 bytes)
BYTE psBootSectSig1;
#define BOOTSIG0 0x55
#define BOOTSIG1 0xaa
}partsector;
typedef __packed struct
{
BYTE exDriveNumber; // drive number (0x80)//0x00 for floopy disk 0x80 for hard disk
BYTE exReserved1; // reserved should always set 0
BYTE exBootSignature; // ext. boot signature (0x29)
#define EXBOOTSIG 0x29
BYTE exVolumeID[4]; // volume ID number
BYTE exVolumeLabel[11]; // volume label "NO NAME"
BYTE exFileSysType[8]; // fs type (FAT12 or FAT)
}extboot;
typedef __packed struct
{
BYTE bsJump[3]; // jump inst E9xxxx or EBxx90
BYTE bsOemName[8]; // OEM name and version
BYTE bsBPB[25]; // BIOS parameter block
BYTE bsExt[26]; // Bootsector Extension
BYTE bsBootCode[448]; // pad so structure is 512b
BYTE bsBootSectSig0; // boot sector signature byte 0x55
BYTE bsBootSectSig1; // boot sector signature byte 0xAA
#define BOOTSIG0 0x55
#define BOOTSIG1 0xaa
}bootsector50;
typedef __packed struct
{
WORD bpbBytesPerSec; // bytes per sector //512 1024 2048 or 4096
BYTE bpbSecPerClust; // sectors per cluster // power of 2
WORD bpbResSectors; // number of reserved sectors //1 is recommend
BYTE bpbFATs; // number of FATs // 2 is recommend
WORD bpbRootDirEnts; // number of root directory entries
WORD bpbSectors; // total number of sectors
BYTE bpbMedia; // media descriptor //0xf8 match the fat[0]
WORD bpbFATsecs; // number of sectors per FAT
WORD bpbSecPerTrack; // sectors per track
WORD bpbHeads; // number of heads
DWORD bpbHiddenSecs; // # of hidden sectors
DWORD bpbHugeSectors; // # of sectors if bpbSectors == 0
}bpb50;
typedef __packed struct
{
BYTE bsJump[3]; // jump inst E9xxxx or EBxx90
BYTE bsOemName[8]; // OEM name and version
BYTE bsBPB[53]; // BIOS parameter block
BYTE bsExt[26]; // Bootsector Extension
BYTE bsBootCode[418]; // pad so structure is 512b
BYTE bsBootSectSig2; // boot sector signature byte 0x00
BYTE bsBootSectSig3; // boot sector signature byte 0x00
BYTE bsBootSectSig0; // boot sector signature byte 0x55
BYTE bsBootSectSig1; // boot sector signature byte 0xAA
#define BOOTSIG0 0x55
#define BOOTSIG1 0xaa
#define BOOTSIG2 0x00
#define BOOTSIG3 0x00
}bootsector710;
typedef __packed struct
{
WORD bpbBytesPerSec; // bytes per sector
BYTE bpbSecPerClust; // sectors per cluster
WORD bpbResSectors; // number of reserved sectors
BYTE bpbFATs; // number of FATs
WORD bpbRootDirEnts; // number of root directory entries
WORD bpbSectors; // total number of sectors
BYTE bpbMedia; // media descriptor
WORD bpbFATsecs; // number of sectors per FAT
WORD bpbSecPerTrack; // sectors per track
WORD bpbHeads; // number of heads
DWORD bpbHiddenSecs; // # of hidden sectors
// 3.3 compat ends here
DWORD bpbHugeSectors; // # of sectors if bpbSectors == 0
// 5.0 compat ends here
DWORD bpbBigFATsecs;// like bpbFATsecs for FAT32
WORD bpbExtFlags; // extended flags:
#define FATNUM 0xf // mask for numbering active FAT
#define FATMIRROR 0x80 // FAT is mirrored (like it always was)
WORD bpbFSVers; // filesystem version
#define FSVERS 0 // currently only 0 is understood
DWORD bpbRootClust; // start cluster for root directory
WORD bpbFSInfo; // filesystem info structure sector
WORD bpbBackup; // backup boot sector
// There is a 12 byte filler here, but we ignore it
}bpb710;
// 文件結構體
typedef __packed struct
{
BYTE deName[8]; // filename, blank filled
#define SLOT_EMPTY 0x00 // slot has never been used
#define SLOT_E5 0x05 // the real value is 0xE5
#define SLOT_DELETED 0xE5 // file in this slot deleted
#define SLOT_DIR 0x2E // a directorymmm
BYTE deExtension[3]; // extension, blank filled
BYTE deAttributes; // file attributes
#define ATTR_NORMAL 0x00 // 普通文件
#define ATTR_READONLY 0x01 // 只讀文件
#define ATTR_HIDDEN 0x02 // 隱藏文件
#define ATTR_SYSTEM 0x04 // 系統文件
#define ATTR_VOLUME 0x08 // 卷標
#define ATTR_LONG_FILENAME 0x0F // 長文件名標志
#define ATTR_DIRECTORY 0x10 // 文件夾文件
#define ATTR_ARCHIVE 0x20 // 新的或者歸檔文件
BYTE deLowerCase; // NT VFAT lower case flags (set to zero)
#define LCASE_BASE 0x08 // filename base in lower case
#define LCASE_EXT 0x10 // filename extension in lower case
BYTE deCHundredth; // hundredth of seconds in CTime
BYTE deCTime[2]; // create time
BYTE deCDate[2]; // create date
BYTE deADate[2]; // access date
WORD deHighClust; // high bytes of cluster number
BYTE deMTime[2]; // last update time
BYTE deMDate[2]; // last update date
WORD deStartCluster; // starting cluster of file
DWORD deFileSize; // size of file in bytes
}direntry;
// number of directory entries in one sector
#define DIRENTRIES_PER_SECTOR 0x10 //when the bpbBytesPerSec=512
// Structure of a Win95 long name directory entry
typedef __packed struct
{
BYTE weCnt; //
#define WIN_LAST 0x40
#define WIN_CNT 0x3f
BYTE wePart1[10];
BYTE weAttributes;
#define ATTR_WIN95 0x0f
BYTE weReserved1;
BYTE weChksum;
BYTE wePart2[12];
WORD weReserved2;
BYTE wePart3[4];
}winentry;
#define WIN_ENTRY_CHARS 13 // Number of chars per winentry
// Maximum filename length in Win95
// Note: Must be < sizeof(dirent.d_name)
#define WIN_MAXLEN 255
// This is the format of the contents of the deTime field in the direntry
// structure.
// We don't use bitfields because we don't know how compilers for
// arbitrary machines will lay them out.
#define DT_2SECONDS_MASK 0x1F // seconds divided by 2
#define DT_2SECONDS_SHIFT 0
#define DT_MINUTES_MASK 0x7E0 // minutes
#define DT_MINUTES_SHIFT 5
#define DT_HOURS_MASK 0xF800 // hours
#define DT_HOURS_SHIFT 11
// This is the format of the contents of the deDate field in the direntry
// structure.
#define DD_DAY_MASK 0x1F // day of month
#define DD_DAY_SHIFT 0
#define DD_MONTH_MASK 0x1E0 // month
#define DD_MONTH_SHIFT 5
#define DD_YEAR_MASK 0xFE00 // year - 1980
#define DD_YEAR_SHIFT 9
//用到的外部函數
//extern u16 POINT_COLOR; //畫筆顏色
//extern u16 BACK_COLOR; //背景顏色
//extern void delay_ms(u16);
//FAT原有的函數
unsigned char FAT_Init(void);//初始化
unsigned long FAT_NextCluster(unsigned long cluster);//查找下一簇號
u32 fatClustToSect(u32 cluster);//將簇號轉換為扇區號
u8 Get_File_Info(u32 dir_clust,FileInfoStruct *FileInfo,u16 type,u16 *count);//查找文件
void F_Open(FileInfoStruct *FileInfo);//打開文件
unsigned char F_Read(FileInfoStruct *FileInfo,u8 *buf);//讀文件，size=0代表整個文件
unsigned long FAT_OpenDir(BYTE * dir);//打開目錄
#endif
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