FATfs.zip_fat_fat文件系统

/*----------------------------------------------------------------------------/ / FatFs - FAT file system module R0.08b (C)ChaN, 2011 /-----------------------------------------------------------------------------/ / FatFs module is a generic FAT file system module for small embedded systems. / This is a free software that opened for education, research and commercial / developments under license policy of following terms. / / Copyright (C) 2011, ChaN, all right reserved. / / * The FatFs module is a free software and there is NO WARRANTY. / * No restriction on use. You can use, modify and redistribute it for / personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY. / * Redistributions of source code must retain the above copyright notice. / /-----------------------------------------------------------------------------/ / Feb 26,'06 R0.00 Prototype. / / Apr 29,'06 R0.01 First stable version. / / Jun 01,'06 R0.02 Added FAT12 support. / Removed unbuffered mode. / Fixed a problem on small (<32M) partition. / Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM). / / Sep 22,'06 R0.03 Added f_rename(). / Changed option _FS_MINIMUM to _FS_MINIMIZE. / Dec 11,'06 R0.03a Improved cluster scan algorithm to write files fast. / Fixed f_mkdir() creates incorrect directory on FAT32. / / Feb 04,'07 R0.04 Supported multiple drive system. / Changed some interfaces for multiple drive system. / Changed f_mountdrv() to f_mount(). / Added f_mkfs(). / Apr 01,'07 R0.04a Supported multiple partitions on a physical drive. / Added a capability of extending file size to f_lseek(). / Added minimization level 3. / Fixed an endian sensitive code in f_mkfs(). / May 05,'07 R0.04b Added a configuration option _USE_NTFLAG. / Added FSInfo support. / Fixed DBCS name can result FR_INVALID_NAME. / Fixed short seek (<= csize) collapses the file object. / / Aug 25,'07 R0.05 Changed arguments of f_read(), f_write() and f_mkfs(). / Fixed f_mkfs() on FAT32 creates incorrect FSInfo. / Fixed f_mkdir() on FAT32 creates incorrect directory. / Feb 03,'08 R0.05a Added f_truncate() and f_utime(). / Fixed off by one error at FAT sub-type determination. / Fixed btr in f_read() can be mistruncated. / Fixed cached sector is not flushed when create and close without write. / / Apr 01,'08 R0.06 Added fputc(), fputs(), fprintf() and fgets(). / Improved performance of f_lseek() on moving to the same or following cluster. / / Apr 01,'09 R0.07 Merged Tiny-FatFs as a configuration option. (_FS_TINY) / Added long file name feature. / Added multiple code page feature. / Added re-entrancy for multitask operation. / Added auto cluster size selection to f_mkfs(). / Added rewind option to f_readdir(). / Changed result code of critical errors. / Renamed string functions to avoid name collision. / Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg. / Added multiple sector size feature. / Jun 21,'09 R0.07c Fixed f_unlink() can return FR_OK on error. / Fixed wrong cache control in f_lseek(). / Added relative path feature. / Added f_chdir() and f_chdrive(). / Added proper case conversion to extended char. / Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h. / Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH. / Fixed name matching error on the 13 char boundary. / Added a configuration option, _LFN_UNICODE. / Changed f_readdir() to return the SFN with always upper case on non-LFN cfg. / / May 15,'10 R0.08 Added a memory configuration option. (_USE_LFN = 3) / Added file lock feature. (_FS_SHARE) / Added fast seek feature. (_USE_FASTSEEK) / Changed some types on the API, XCHAR->TCHAR. / Changed fname member in the FILINFO structure on Unicode cfg. / String functions support UTF-8 encoding files on Unicode cfg. / Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2) / Added sector erase feature. (_USE_ERASE) / Moved file lock semaphore table from fs object to the bss. / Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'. / Fixed f_mkfs() creates wrong FAT32 volume. / Jan 15,'11 R0.08b Fast seek feature is also applied to f_read() and f_write(). / f_lseek() reports required table size on creating CLMP. / Extended format syntax of f_printf function. / Ignores duplicated directory separators in given path names. /---------------------------------------------------------------------------*/ #include "ff.h" /* FatFs configurations and declarations */ #include "diskio.h" /* Declarations of low level disk I/O functions */ /*-------------------------------------------------------------------------- Module Private Definitions ---------------------------------------------------------------------------*/ #if _FATFS != 8237 #error Wrong include file (ff.h). #endif /* Definitions on sector size */ #if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096 #error Wrong sector size. #endif #if _MAX_SS != 512 #define SS(fs) ((fs)->ssize) /* Multiple sector size */ #else #define SS(fs) 512U /* Fixed sector size */ #endif /* Reentrancy related */ #if _FS_REENTRANT #if _USE_LFN == 1 #error Static LFN work area must not be used in re-entrant configuration. #endif #define ENTER_FF(fs) { if (!lock_fs(fs)) return FR_TIMEOUT; } #define LEAVE_FF(fs, res) { unlock_fs(fs, res); return res; } #else #define ENTER_FF(fs) #define LEAVE_FF(fs, res) return res #endif #define ABORT(fs, res) { fp->flag |= FA__ERROR; LEAVE_FF(fs, res); } /* File shareing feature */ #if _FS_SHARE #if _FS_READONLY #error _FS_SHARE must be 0 on read-only cfg. #endif typedef struct { FATFS *fs; /* File ID 1, volume (NULL:blank entry) */ DWORD clu; /* File ID 2, directory */ WORD idx; /* File ID 3, directory index */ WORD ctr; /* File open counter, 0:none, 0x01..0xFF:read open count, 0x100:write mode */ } FILESEM; #endif /* Misc definitions */ #define LD_CLUST(dir) (((DWORD)LD_WORD(dir+DIR_FstClusHI)<<16) | LD_WORD(dir+DIR_FstClusLO)) #define ST_CLUST(dir,cl) {ST_WORD(dir+DIR_FstClusLO, cl); ST_WORD(dir+DIR_FstClusHI, (DWORD)cl>>16);} /* DBCS code ranges and SBCS extend char conversion table */ #if _CODE_PAGE == 932 /* Japanese Shift-JIS */ #define _DF1S 0x81 /* DBC 1st byte range 1 start */ #define _DF1E 0x9F /* DBC 1st byte range 1 end */ #define _DF2S 0xE0 /* DBC 1st byte range 2 start */ #define _DF2E 0xFC /* DBC 1st byte range 2 end */ #define _DS1S 0x40 /* DBC 2nd byte range 1 start */ #define _DS1E 0x7E /* DBC 2nd byte range 1 end */ #define _DS2S 0x80 /* DBC 2nd byte range 2 start */ #define _DS2E 0xFC /* DBC 2nd byte range 2 end */ #elif _CODE_PAGE == 936 /* Simplified Chinese GBK */ #define _DF1S 0x81 #define _DF1E 0xFE #define _DS1S 0x40 #define _DS1E 0x7E #define _DS2S 0x80 #define _DS2E 0xFE #elif _CODE_PAGE == 949 /* Korean */ #define _DF1S 0x81 #define _DF1E 0xFE #define _DS1S 0x41 #define _DS1E 0x5A #define _DS2S 0x61 #define _DS2E 0x7A #define _DS3S 0x81 #define _DS