fat.h

基于s3c2440的U盘读写程序

#ifndef _FAT_H_
#define _FAT_H_
#include "s3c2410.h"
#include "part.h"
#define CONFIG_SUPPORT_VFAT
#define SECTOR_SIZE FS_BLOCK_SIZE
#define FS_BLOCK_SIZE 512
#if FS_BLOCK_SIZE != SECTOR_SIZE
#error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
#endif
#define MAX_CLUSTSIZE	65536
#define DIRENTSPERBLOCK	(FS_BLOCK_SIZE/sizeof(dir_entry))
#define DIRENTSPERCLUST	((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry))
#define FATBUFBLOCKS	6
#define FATBUFSIZE	       (FS_BLOCK_SIZE*FATBUFBLOCKS)
#define FAT12BUFSIZE	((FATBUFSIZE*2)/3)
#define FAT16BUFSIZE	(FATBUFSIZE/2)
#define FAT32BUFSIZE	(FATBUFSIZE/4)
/* Filesystem identifiers */
#define FAT12_SIGN	"FAT12   "
#define FAT16_SIGN	"FAT16   "
#define FAT32_SIGN	"FAT32   "
#define SIGNLEN		8
/* File attributes */
#define ATTR_RO      1
#define ATTR_HIDDEN  2
#define ATTR_SYS     4
#define ATTR_VOLUME  8
#define ATTR_DIR     16
#define ATTR_ARCH    32
#define ATTR_VFAT     (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
#define DELETED_FLAG	((char)0xe5) /* Marks deleted files when in name[0] */
#define aRING		0x05	     /* Used to represent '