www.pudn.com > UDiskFileSystem.rar > FAT.h
#ifndef FAT_H
#define FAT_H
#include "global.h"
#include "mx_types.h"
// Some useful cluster numbers
#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 0xfffffff6 // reserved cluster range
#define CLUST_BAD 0xfffffff7 // a cluster with a defect
#define CLUST_EOFS 0xfffffff8 // start of eof cluster range
#define CLUST_EOFE 0xffffffff // end of eof cluster range
#define FAT16_MASK 0x0000ffff // mask for 16 bit cluster numbers
#define FAT32_MASK 0x0fffffff // mask for FAT32 cluster numbers
// Partition Type used in the partition record
#define PART_TYPE_UNKNOWN 0x00
#define PART_TYPE_FAT12 0x01
#define PART_TYPE_XENIX 0x02
#define PART_TYPE_DOSFAT16 0x04
#define PART_TYPE_EXTDOS 0x05
#define PART_TYPE_FAT16 0x06
#define PART_TYPE_NTFS 0x07
#define PART_TYPE_FAT32 0x0B
#define PART_TYPE_FAT32LBA 0x0C
#define PART_TYPE_FAT16LBA 0x0E
#define PART_TYPE_EXTDOSLBA 0x0F
#define PART_TYPE_ONTRACK 0x33
#define PART_TYPE_NOVELL 0x40
#define PART_TYPE_PCIX 0x4B
#define PART_TYPE_PHOENIXSAVE 0xA0
#define PART_TYPE_CPM 0xDB
#define PART_TYPE_DBFS 0xE0
#define PART_TYPE_BBT 0xFF
#define BYTES_PER_SECTOR 512 //bytes
#define DIRENTRY_SIZE 32 //bytes
#define FAT_DIRENTRIES_PER_SECTOR BYTES_PER_SECTOR/DIRENTRY_SIZE
#define FAT32_STRUCTS_PER_SECTOR 128
#define FAT16_STRUCTS_PER_SECTOR 256
//stdio.h has these three define .
//#define SEEK_SET 0x00
//#define SEEK_CUR 0x01
//#define SEEK_END 0x02
#ifdef FOR_WIN
# pragma pack (1)
struct partrecord // length 16 bytes
{
u_8 prIsActive; // 0x80 indicates active partition
u_8 prStartHead; // starting head for partition
u_16 prStartCylSect; // starting cylinder and sector
u_8 prPartType; // partition type (see above)
u_8 prEndHead; // ending head for this partition
u_16 prEndCylSect; // ending cylinder and sector
u_32 prStartLBA; // first LBA sector for this partition
u_32 prSize; // size of this partition (sectors)
};
# pragma pack ()
#else
__packed struct partrecord // length 16 bytes
{
u_8 prIsActive; // 0x80 indicates active partition
u_8 prStartHead; // starting head for partition
u_16 prStartCylSect; // starting cylinder and sector
u_8 prPartType; // partition type (see above)
u_8 prEndHead; // ending head for this partition
u_16 prEndCylSect; // ending cylinder and sector
u_32 prStartLBA; // first LBA sector for this partition
u_32 prSize; // size of this partition (sectors)
};
#endif
// Format of a boot sector. This is the first sector on a DOS floppy disk
// or the first sector of a partition on a hard disk. But, it is not the
// first sector of a partitioned hard disk.
#ifdef FOR_WIN
# pragma pack (1)
struct bootsector710 {
u_8 bsJump[3]; // jump inst E9xxxx or EBxx90
char bsOEMName[8]; // OEM name and version
char bsBPB[53]; // BIOS parameter block
char bsExt[26]; // Bootsector Extension
char bsBootCode[418]; // pad so structure is 512b
u_8 bsBootSectSig2; // 2 & 3 are only defined for FAT32?
u_8 bsBootSectSig3;
u_8 bsBootSectSig0; // boot sector signature byte 0x55
u_8 bsBootSectSig1; // boot sector signature byte 0xAA
//#define BOOTSIG0 0x55
//#define BOOTSIG1 0xaa
//#define BOOTSIG2 0
//#define BOOTSIG3 0
};
# pragma pack ()
#else
__packed struct bootsector710
{
u_8 bsJump[3]; // jump inst E9xxxx or EBxx90
char bsOEMName[8]; // OEM name and version
char bsBPB[53]; // BIOS parameter block
char bsExt[26]; // Bootsector Extension
char bsBootCode[418]; // pad so structure is 512b
u_8 bsBootSectSig2; // 2 & 3 are only defined for FAT32?
u_8 bsBootSectSig3;
u_8 bsBootSectSig0; // boot sector signature byte 0x55
u_8 bsBootSectSig1; // boot sector signature byte 0xAA
//#define BOOTSIG0 0x55
//#define BOOTSIG1 0xaa
//#define BOOTSIG2 0
//#define BOOTSIG3 0
};
#endif
#define BOOTSIG0 0x55
#define BOOTSIG1 0xaa
#define BOOTSIG2 0
#define BOOTSIG3 0
/***************************************************************/
/***************************************************************/
// BPB for DOS 7.10 (FAT32)
// This one has a few extensions to bpb50.
#ifdef FOR_WIN
# pragma pack (1)
struct bpb710 {
u_16 bpbBytesPerSec; // bytes per sector
u_8 bpbSecPerClust; // sectors per cluster
u_16 bpbResSectors; // number of reserved sectors
u_8 bpbFATs; // number of FATs
u_16 bpbRootDirEnts; // number of root directory entries
u_16 bpbSectors; // total number of sectors
u_8 bpbMedia; // media descriptor
u_16 bpbFATsecs; // number of sectors per FAT
u_16 bpbSecPerTrack; // sectors per track
u_16 bpbHeads; // number of heads
u_32 bpbHiddenSecs; // # of hidden sectors
// 3.3 compat ends here
u_32 bpbHugeSectors; // # of sectors if bpbSectors == 0
// 5.0 compat ends here
u_32 bpbBigFATsecs; // like bpbFATsecs for FAT32
u_16 bpbExtFlags; // extended flags:
//#define FATNUM 0xf // mask for numbering active FAT
//#define FATMIRROR 0x80 // FAT is mirrored (like it always was)
u_16 bpbFSVers; // filesystem version
//#define FSVERS 0 // currently only 0 is understood
u_32 bpbRootClust; // start cluster for root directory
u_16 bpbFSInfo; // filesystem info structure sector
u_16 bpbBackup; // backup boot sector
u_8 bpbReserved[12];
u_8 bpbDriveNum;
u_8 bpbReserved1;
u_8 bpbBootSig;
u_8 bpbVolID[4];
u_8 bpbVolLabel[11];
u_8 bpbFileSystemType[8];
};
# pragma pack ()
#else
__packed struct bpb710
{
u_16 bpbBytesPerSec; // bytes per sector
u_8 bpbSecPerClust; // sectors per cluster
u_16 bpbResSectors; // number of reserved sectors
u_8 bpbFATs; // number of FATs
u_16 bpbRootDirEnts; // number of root directory entries
u_16 bpbSectors; // total number of sectors
u_8 bpbMedia; // media descriptor
u_16 bpbFATsecs; // number of sectors per FAT
u_16 bpbSecPerTrack; // sectors per track
u_16 bpbHeads; // number of heads
u_32 bpbHiddenSecs; // # of hidden sectors
// 3.3 compat ends here
u_32 bpbHugeSectors; // # of sectors if bpbSectors == 0
// 5.0 compat ends here
u_32 bpbBigFATsecs; // like bpbFATsecs for FAT32
u_16 bpbExtFlags; // extended flags:
//#define FATNUM 0xf // mask for numbering active FAT
//#define FATMIRROR 0x80 // FAT is mirrored (like it always was)
u_16 bpbFSVers; // filesystem version
//#define FSVERS 0 // currently only 0 is understood
u_32 bpbRootClust; // start cluster for root directory
u_16 bpbFSInfo; // filesystem info structure sector
u_16 bpbBackup; // backup boot sector
u_8 bpbReserved[12];
u_8 bpbDriveNum;
u_8 bpbReserved1;
u_8 bpbBootSig;
u_8 bpbVolID[4];
u_8 bpbVolLabel[11];
u_8 bpbFileSystemType[8];
};
#endif
#define FATNUM 0xf // mask for numbering active FAT
#define FATMIRROR 0x80 // FAT is mirrored (like it always was)
#define FSVERS 0 // currently only 0 is understood
// Structure of a dos directory entry.
#ifdef FOR_WIN
# pragma pack (1)
struct direntry {
u_8 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
u_8 deExtension[3]; // extension, blank filled
u_8 deAttributes; // file attributes
//#define ATTR_NORMAL 0x00 // normal file
//#define ATTR_READONLY 0x01 // file is readonly
//#define ATTR_HIDDEN 0x02 // file is hidden
//#define ATTR_SYSTEM 0x04 // file is a system file
//#define ATTR_VOLUME 0x08 // entry is a volume label
//#define ATTR_LONG_FILENAME 0x0f // this is a long filename entry
//#define ATTR_DIRECTORY 0x10 // entry is a directory name
//#define ATTR_ARCHIVE 0x20 // file is new or modified
u_8 deLowerCase; // NT VFAT lower case flags
//#define LCASE_BASE 0x08 // filename base in lower case
//#define LCASE_EXT 0x10 // filename extension in lower case
u_8 deCHundredth; // hundredth of seconds in CTime
u_8 deCTime[2]; // create time
u_8 deCDate[2]; // create date
u_8 deADate[2]; // access date
u_16 deHighClust; // high bytes of cluster number
u_8 deMTime[2]; // last update time
u_8 deMDate[2]; // last update date
u_16 deStartCluster; // starting cluster of file
u_32 deFileSize; // size of file in bytes
};
# pragma pack ()
#else
__packed struct direntry
{
u_8 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
u_8 deExtension[3]; // extension, blank filled
u_8 deAttributes; // file attributes
//#define ATTR_NORMAL 0x00 // normal file
//#define ATTR_READONLY 0x01 // file is readonly
//#define ATTR_HIDDEN 0x02 // file is hidden
//#define ATTR_SYSTEM 0x04 // file is a system file
//#define ATTR_VOLUME 0x08 // entry is a volume label
//#define ATTR_LONG_FILENAME 0x0f // this is a long filename entry
//#define ATTR_DIRECTORY 0x10 // entry is a directory name
//#define ATTR_ARCHIVE 0x20 // file is new or modified
u_8 deLowerCase; // NT VFAT lower case flags
//#define LCASE_BASE 0x08 // filename base in lower case
//#define LCASE_EXT 0x10 // filename extension in lower case
u_8 deCHundredth; // hundredth of seconds in CTime
u_8 deCTime[2]; // create time
u_8 deCDate[2]; // create date
u_8 deADate[2]; // access date
u_16 deHighClust; // high bytes of cluster number
u_8 deMTime[2]; // last update time
u_8 deMDate[2]; // last update date
u_16 deStartCluster; // starting cluster of file
u_32 deFileSize; // size of file in bytes
};
#endif
#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 ATTR_NORMAL 0x00 // normal file
#define ATTR_READONLY 0x01 // file is readonly
#define ATTR_HIDDEN 0x02 // file is hidden
#define ATTR_SYSTEM 0x04 // file is a system file
#define ATTR_VOLUME 0x08 // entry is a volume label
#define ATTR_LONG_FILENAME 0x0f // this is a long filename entry
#define ATTR_DIRECTORY 0x10 // entry is a directory name
#define ATTR_ARCHIVE 0x20 // file is new or modified
#define LCASE_BASE 0x08 // filename base in lower case
#define LCASE_EXT 0x10 // filename extension in lower case
// Internal structure of a FILE, used in the program, not writed in FAT
typedef struct{
struct direntry de; // Information about the file opened
u_32 currentSector; // Actual sector address in memory
u_8 *buffer; // buffer pointer to memory (cache sector)
u_32 bytePointer; // byte pointer to the actual byte (divide by 512 to find the current buffer position)
u_8 sectorHasChanged; // TRUE if the sector in memory has changed and needs to be write before a close file or change in sector
}TFILE;
// FAT32 FSInfo block.
struct fsinfo {
unsigned char fsisig1[4];
unsigned char fsifill1[480];
unsigned char fsisig2[4];
unsigned char fsinfree[4];
unsigned char fsinxtfree[4];
unsigned char fsifill2[12];
unsigned char fsisig3[4];
unsigned char fsifill3[508];
unsigned char fsisig4[4];
};
// Prototypes
u_8 fatInit (u_8 index);
u_32 fatGetFirstDirCluster(void);
u_32 fatClustToSect (u_32 clust);
u_32 fatSectToClust(u_32 sect);
u_8 *fatDir(u_32 cluster, u_32 offset);
struct direntry *fatGetFileInfo (struct direntry *rde, char *shortName);
char *fatGetVolLabel (void);
struct partrecord *fatGetPartInfo (void);
u_8 fatCddir (char *path);
TFILE *fatFopen (char *shortName);
char fatFgetc (TFILE *fp);
u_8 fatFseek (TFILE *fp, u_32 offSet, u_8 mode);
u_8 fatFeof (TFILE *fp);
void fatNormalize (char *string);
u_32 fatGetCurDirCluster(void);
u_8 fatMkdir (char *path);
u_8 fatRename (char *oldShortName, char *newShortName);
u_8 fatRemove (char *shortName);
TFILE *fatFcreate (char *shortName);
u_8 fatFclose(TFILE *fp);
u_8 fatFflush (TFILE *fp);
u_8 fatFputc (TFILE *fp, char c);
struct direntry *fatNextFreeDirEntry (u_32 cluster);
u_32 fatNextFreeCluster (u_32 startSector);
void fatWriteEOC (u_32 cluster);
void fatWrite (u_32 cluster, u_32 data);
u_32 fatTableClustToSect (u_32 cluster);
u_32 fatLastCluster (u_32 cluster);
u_8 fatDirectoryIsEmpty (u_32 DirCluster);
void fatRemoveAll (void);
u_16 fatFread(u_8* buffer,u_16 size,TFILE *fp);
#endif