apfs_fat32_definitions.h

一个可以在开发板上运行的fat文件系统,是在windows平台下开发的,是学习文件系统的好帮手

//-----------------------------------------------------------------------------
// This file is part of AP.FS
// AP.FS is a FAT32 file system face to the embedded system,It's target is to
// support the portable storage device such as SD Card,TF Card or USB Disc 's
// file system.
// please login www.another-prj.com to get more details.
//																caiyuqing
//																2008-1-8
//-----------------------------------------------------------------------------
#ifndef _APFS_FAT32_DEFINITIONS_H
#define _APFS_FAT32_DEFINITIONS_H
#include "..\typedef.h"

//-----------------------------------------------------------------------------
//			FAT32 Offsets
//		Name				Offset
//-----------------------------------------------------------------------------

// Boot Sector
#define BS_jmpBoot				0	// Length = 3
#define BS_OEMName				3	// Length = 8
#define BPB_BytsPerSec			11	// Length = 2
#define BPB_SecPerClus			13	// Length = 1
#define BPB_RsvdSecCnt			14	// Length = 2
#define BPB_NumFATs				16	// Length = 1
#define BPB_RootEntCnt			17	// Length = 2
#define BPB_TotSec16			19	// Length = 2
#define BPB_Media				21	// Length = 1
#define	BPB_FATSz16				22	// Length = 2
#define BPB_SecPerTrk			24	// Length = 2
#define BPB_NumHeads			26	// Length = 2
#define BPB_HiddSec				28	// Length = 4
#define BPB_TotSec32			32	// Length = 4

// FAT 12/16
#define BS_FAT_DrvNum			36	// Length = 1
#define BS_FAT_BootSig			38	// Length = 1
#define BS_FAT_VolID			39	// Length = 4
#define BS_FAT_VolLab			43	// Length = 11
#define BS_FAT_FilSysType		54	// Length = 8

// FAT 32
#define BPB_FAT32_FATSz32		36	// Length = 4
#define BPB_FAT32_ExtFlags		40	// Length = 2
#define BPB_FAT32_FSVer			42	// Length = 2
#define BPB_FAT32_RootClus		44	// Length = 4
#define BPB_FAT32_FSInfo		48	// Length = 2
#define BPB_FAT32_BkBootSec		50	// Length = 2
#define BS_FAT32_DrvNum			64	// Length = 1
#define BS_FAT32_BootSig		66	// Length = 1
#define BS_FAT32_VolID			67	// Length = 4
#define BS_FAT32_VolLab			71	// Length = 11
#define BS_FAT32_FilSysType		82	// Length = 8

//-----------------------------------------------------------------------------
// FAT Types
//-----------------------------------------------------------------------------
#define	FAT_TYPE_FAT12			1
#define	FAT_TYPE_FAT16			2
#define	FAT_TYPE_FAT32			3

//-----------------------------------------------------------------------------
// FAT32 Specific Statics
//-----------------------------------------------------------------------------
#define SIGNATURE_POSITION						 510
#define SIGNATURE_VALUE							 0xAA55
#define PARTITION1_TYPECODE_LOCATION	 		 450
#define FAT32_TYPECODE1						 	 0x0B
#define FAT32_TYPECODE2						 	 0x0C
#define PARTITION1_LBA_BEGIN_LOCATION	 		 454
	
//-----------------------------------------------------------------------------
// FAT32 File Attributes and Types
//-----------------------------------------------------------------------------
#define FILE_ATTR_READ_ONLY   	0x01
#define FILE_ATTR_HIDDEN 		0x02
#define FILE_ATTR_SYSTEM 		0x04
#define FILE_ATTR_SYSHID		0x06
#define FILE_ATTR_VOLUME_ID 	0x08
#define FILE_ATTR_DIRECTORY		0x10
#define FILE_ATTR_ARCHIVE  		0x20
#define FILE_ATTR_LFN_TEXT		0x0F
#define FILE_HEADER_BLANK		0x00
#define FILE_HEADER_DELETED		0xE5
#define FILE_TYPE_DIR			0x10
#define FILE_TYPE_FILE			0x20

//-----------------------------------------------------------------------------
// Other Defines
//-----------------------------------------------------------------------------
#define FAT32_EOC_FLAG			0xFFFFFFFF

#pragma pack(1)
struct fat32_short_entry
{
	BYTE name[11];
	BYTE attr;
	BYTE ntres;
	BYTE crt_time_tenth;
	BYTE crt_time[2];
	BYTE crt_date[2];
	BYTE lst_acc_date[2];
	UINT16 fst_clus_hi;
	BYTE wrt_time[2];
	BYTE wrt_date[2];
	UINT16 fst_clus_lo;
	UINT32 file_size;
};

#endif