avr/qmk/firmware - [no description]

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Diffstat (limited to 'lib/lufa/Projects/Webserver/Lib')

0 files changed, 0 insertions, 0 deletions

/*----------------------------------------------------------------------------/ / FatFs - FAT file system module R0.07e (C)ChaN, 2010 /-----------------------------------------------------------------------------/ / 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 trems. / / Copyright (C) 2010, 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) patition. / 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 algolithm 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 plysical 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 buffer configuration option. / Added long file name support. / Added multiple code page support. / 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 support. / 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. /---------------------------------------------------------------------------*/ #include "ff.h" /* FatFs configurations and declarations */ #include "diskio.h" /* Declarations of low level disk I/O functions */ /*-------------------------------------------------------------------------- Module Private Definitions ---------------------------------------------------------------------------*/ #if _FATFS != 0x007E #error Wrong include file (ff.h). #endif #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); } #ifndef NULL #define NULL 0 #endif /* Name status flags */ #define NS 11 /* Offset of name status byte */ #define NS_LOSS 0x01 /* Out of 8.3 format */ #define NS_LFN 0x02 /* Force to create LFN entry */ #define NS_LAST 0x04 /* Last segment */ #define NS_BODY 0x08 /* Lower case flag (body) */ #define NS_EXT 0x10 /* Lower case flag (ext) */ #define NS_DOT 0x20 /* Dot entry */ /*-------------------------------------------------------------------------- Private Work Area ---------------------------------------------------------------------------*/ #if _DRIVES < 1 || _DRIVES > 9 #error Number of drives must be 1-9. #endif static FATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */ static WORD Fsid; /* File system mount ID */ #if _FS_RPATH static BYTE Drive; /* Current drive */ #endif #if _USE_LFN == 1 /* LFN with static LFN working buffer */ static WCHAR LfnBuf[_MAX_LFN + 1]; #define NAMEBUF(sp,lp) BYTE sp[12]; WCHAR *lp = LfnBuf #define INITBUF(dj,sp,lp) dj.fn = sp; dj.lfn = lp #elif _USE_LFN > 1 /* LFN with dynamic LFN working buffer */ #define NAMEBUF(sp,lp) BYTE sp[12]; WCHAR lbuf[_MAX_LFN + 1], *lp = lbuf #define INITBUF(dj,sp,lp) dj.fn = sp; dj.lfn = lp #else /* No LFN */ #define NAMEBUF(sp,lp) BYTE sp[12] #define INITBUF(dj,sp,lp) dj.fn = sp #endif /*-------------------------------------------------------------------------- Module Private Functions ---------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------*/ /* String functions */ /*-----------------------------------------------------------------------*/ /* Copy memory to memory */ static void mem_cpy (void* dst, const void* src, int cnt) { char *d = (char*)dst; const char *s = (const char *)src; while (cnt--) *d++ = *s++; } /* Fill memory */ static void mem_set (void* dst, int val, int cnt) { char *d = (char*)dst; while (cnt--) *d++ = (char)val; } /* Compare memory to memory */ static int mem_cmp (const void* dst, const void* src, int cnt) { const char *d = (const char *)dst, *s = (const char *)src; int r = 0; while (cnt-- && (r = *d++ - *s++) == 0) ; return r; } /* Check if chr is contained in the string */ static int chk_chr (const char* str, int chr) { while (*str && *str != chr) str++; return *str; } /*-----------------------------------------------------------------------*/ /* Request/Release grant to access the volume */ /*-----------------------------------------------------------------------*/ #if _FS_REENTRANT static BOOL lock_fs ( FATFS *fs /* File system object */ ) { return ff_req_grant(fs->sobj); } static void unlock_fs ( FATFS *fs, /* File system object */ FRESULT res /* Result code to be returned */ ) { if (res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_INVALID_OBJECT && res != FR_TIMEOUT) { ff_rel_grant(fs->sobj); } } #endif /*-----------------------------------------------------------------------*/ /* Change window offset */ /*-----------------------------------------------------------------------*/ static FRESULT move_window ( FATFS *fs, /* File system object */ DWORD sector /* Sector number to make apperance in the fs->win[] */ ) /* Move to zero only writes back dirty window */ { DWORD wsect; wsect = fs->winsect; if (wsect != sector) { /* Changed current window */ #if !_FS_READONLY if (fs->wflag) { /* Write back dirty window if needed */ if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK) return FR_DISK_ERR; fs->wflag = 0; if (wsect < (fs->fatbase + fs->sects_fat)) { /* In FAT area */ BYTE nf; for (nf = fs->n_fats; nf > 1; nf--) { /* Refrect the change to all FAT copies */ wsect += fs->sects_fat; disk_write(fs->drive, fs->win, wsect, 1); } } } #endif if (sector) { if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK) return FR_DISK_ERR; fs->winsect = sector; } } return FR_OK; } /*-----------------------------------------------------------------------*/ /* Clean-up cached data */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static FRESULT sync ( /* FR_OK: successful, FR_DISK_ERR: failed */ FATFS *fs /* File system object */ ) { FRESULT res; res = move_window(fs, 0); if (res == FR_OK) { /* Update FSInfo sector if needed */ if (fs->fs_type == FS_FAT32 && fs->fsi_flag) { fs->winsect = 0; mem_set(fs->win, 0, 512); ST_WORD(fs->win+BS_55AA, 0xAA55); ST_DWORD(fs->win+FSI_LeadSig, 0x41615252); ST_DWORD(fs->win+FSI_StrucSig, 0x61417272); ST_DWORD(fs->win+FSI_Free_Count, fs->free_clust); ST_DWORD(fs->win+FSI_Nxt_Free, fs->last_clust); disk_write(fs->drive, fs->win, fs->fsi_sector, 1); fs->fsi_flag = 0; } /* Make sure that no pending write process in the physical drive */ if (disk_ioctl(fs->drive, CTRL_SYNC, (void*)NULL) != RES_OK) res = FR_DISK_ERR; } return res; } #endif /*-----------------------------------------------------------------------*/ /* FAT access - Read value of a FAT entry */ /*-----------------------------------------------------------------------*/ DWORD get_fat ( /* 0xFFFFFFFF:Disk error, 1:Interal error, Else:Cluster status */ FATFS *fs, /* File system object */ DWORD clst /* Cluster# to get the link information */ ) { UINT wc, bc; DWORD fsect; if (clst < 2 || clst >= fs->max_clust) /* Range check */ return 1; fsect = fs->fatbase; switch (fs->fs_type) { case FS_FAT12 : bc = clst; bc += bc / 2; if (move_window(fs, fsect + (bc / SS(fs)))) break; wc = fs->win[bc & (SS(fs) - 1)]; bc++; if (move_window(fs, fsect + (bc / SS(fs)))) break; wc |= (WORD)fs->win[bc & (SS(fs) - 1)] << 8; return (clst & 1) ? (wc >> 4) : (wc & 0xFFF); case FS_FAT16 : if (move_window(fs, fsect + (clst / (SS(fs) / 2)))) break; return LD_WORD(&fs->win[((WORD)clst * 2) & (SS(fs) - 1)]); case FS_FAT32 : if (move_window(fs, fsect + (clst / (SS(fs) / 4)))) break; return LD_DWORD(&fs->win[((WORD)clst * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF; } return 0xFFFFFFFF; /* An error occured at the disk I/O layer */ } /*-----------------------------------------------------------------------*/ /* FAT access - Change value of a FAT entry */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY FRESULT put_fat ( FATFS *fs, /* File system object */ DWORD clst, /* Cluster# to be changed in range of 2 to fs->max_clust - 1 */ DWORD val /* New value to mark the cluster */ ) { UINT bc; BYTE *p; DWORD fsect; FRESULT res; if (clst < 2 || clst >= fs->max_clust) { /* Range check */ res = FR_INT_ERR; } else { fsect = fs->fatbase; switch (fs->fs_type) { case FS_FAT12 : bc = clst; bc += bc / 2; res = move_window(fs, fsect + (bc / SS(fs))); if (res != FR_OK) break; p = &fs->win[bc & (SS(fs) - 1)]; *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val; bc++; fs->wflag = 1; res = move_window(fs, fsect + (bc / SS(fs))); if (res != FR_OK) break; p = &fs->win[bc & (SS(fs) - 1)]; *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F)); break; case FS_FAT16 : res = move_window(fs, fsect + (clst / (SS(fs) / 2))); if (res != FR_OK) break; ST_WORD(&fs->win[((WORD)clst * 2) & (SS(fs) - 1)], (WORD)val); break; case FS_FAT32 : res = move_window(fs, fsect + (clst / (SS(fs) / 4))); if (res != FR_OK) break; ST_DWORD(&fs->win[((WORD)clst * 4) & (SS(fs) - 1)], val); break; default : res = FR_INT_ERR; } fs->wflag = 1; } return res; } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* FAT handling - Remove a cluster chain */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static FRESULT remove_chain ( FATFS *fs, /* File system object */ DWORD clst /* Cluster# to remove a chain from */ ) { FRESULT res; DWORD nxt; if (clst < 2 || clst >= fs->max_clust) { /* Check the range of cluster# */ res = FR_INT_ERR; } else { res = FR_OK; while (clst < fs->max_clust) { /* Not a last link? */ nxt = get_fat(fs, clst); /* Get cluster status */ if (nxt == 0) break; /* Empty cluster? */ if (nxt == 1) { res = FR_INT_ERR; break; } /* Internal error? */ if (nxt == 0xFFFFFFFF) { res = FR_DISK_ERR; break; } /* Disk error? */ res = put_fat(fs, clst, 0); /* Mark the cluster "empty" */ if (res != FR_OK) break; if (fs->free_clust != 0xFFFFFFFF) { /* Update FSInfo */ fs->free_clust++; fs->fsi_flag = 1; } clst = nxt; /* Next cluster */ } } return res; } #endif /*-----------------------------------------------------------------------*/ /* FAT handling - Stretch or Create a cluster chain */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static DWORD create_chain ( /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */ FATFS *fs, /* File system object */ DWORD clst /* Cluster# to stretch. 0 means create a new chain. */ ) { DWORD cs, ncl, scl, mcl; mcl = fs->max_clust; if (clst == 0) { /* Create new chain */ scl = fs->last_clust; /* Get suggested start point */ if (scl == 0 || scl >= mcl) scl = 1; } else { /* Stretch existing chain */ cs = get_fat(fs, clst); /* Check the cluster status */ if (cs < 2) return 1; /* It is an invalid cluster */ if (cs < mcl) return cs; /* It is already followed by next cluster */ scl = clst; } ncl = scl; /* Start cluster */ for (;;) { ncl++; /* Next cluster */ if (ncl >= mcl) { /* Wrap around */ ncl = 2; if (ncl > scl) return 0; /* No free custer */ } cs = get_fat(fs, ncl); /* Get the cluster status */ if (cs == 0) break; /* Found a free cluster */ if (cs == 0xFFFFFFFF || cs == 1)/* An error occured */ return cs; if (ncl == scl) return 0; /* No free custer */ } if (put_fat(fs, ncl, 0x0FFFFFFF)) /* Mark the new cluster "in use" */ return 0xFFFFFFFF; if (clst != 0) { /* Link it to the previous one if needed */ if (put_fat(fs, clst, ncl)) return 0xFFFFFFFF; } fs->last_clust = ncl; /* Update FSINFO */ if (fs->free_clust != 0xFFFFFFFF) { fs->free_clust--; fs->fsi_flag = 1; } return ncl; /* Return new cluster number */ } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Get sector# from cluster# */ /*-----------------------------------------------------------------------*/ DWORD clust2sect ( /* !=0: Sector number, 0: Failed - invalid cluster# */ FATFS *fs, /* File system object */ DWORD clst /* Cluster# to be converted */ ) { clst -= 2; if (clst >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */ return clst * fs->csize + fs->database; } /*-----------------------------------------------------------------------*/ /* Directory handling - Seek directory index */ /*-----------------------------------------------------------------------*/ static FRESULT dir_seek ( DIR *dj, /* Pointer to directory object */ WORD idx /* Directory index number */ ) { DWORD clst; WORD ic; dj->index = idx; clst = dj->sclust; if (clst == 1 || clst >= dj->fs->max_clust) /* Check start cluster range */ return FR_INT_ERR; if (!clst && dj->fs->fs_type == FS_FAT32) /* Replace cluster# 0 with root cluster# if in FAT32 */ clst = dj->fs->dirbase; if (clst == 0) { /* Static table */ dj->clust = clst; if (idx >= dj->fs->n_rootdir) /* Index is out of range */ return FR_INT_ERR; dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / 32); /* Sector# */ } else { /* Dynamic table */ ic = SS(dj->fs) / 32 * dj->fs->csize; /* Entries per cluster */ while (idx >= ic) { /* Follow cluster chain */ clst = get_fat(dj->fs, clst); /* Get next cluster */ if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */ if (clst < 2 || clst >= dj->fs->max_clust) /* Reached to end of table or int error */ return FR_INT_ERR; idx -= ic; } dj->clust = clst; dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / 32); /* Sector# */ } dj->dir = dj->fs->win + (idx % (SS(dj->fs) / 32)) * 32; /* Ptr to the entry in the sector */ return FR_OK; /* Seek succeeded */ } /*-----------------------------------------------------------------------*/ /* Directory handling - Move directory index next */ /*-----------------------------------------------------------------------*/ static FRESULT dir_next ( /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not streach */ DIR *dj, /* Pointer to directory object */ BOOL streach /* FALSE: Do not streach table, TRUE: Streach table if needed */ ) { DWORD clst; WORD i; i = dj->index + 1; if (!i || !dj->sect) /* Report EOT when index has reached 65535 */ return FR_NO_FILE; if (!(i % (SS(dj->fs) / 32))) { /* Sector changed? */ dj->sect++; /* Next sector */ if (dj->clust == 0) { /* Static table */ if (i >= dj->fs->n_rootdir) /* Report EOT when end of table */ return FR_NO_FILE; } else { /* Dynamic table */ if (((i / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */ clst = get_fat(dj->fs, dj->clust); /* Get next cluster */ if (clst <= 1) return FR_INT_ERR; if (clst == 0xFFFFFFFF) return FR_DISK_ERR; if (clst >= dj->fs->max_clust) { /* When it reached end of dynamic table */ #if !_FS_READONLY BYTE c; if (!streach) return FR_NO_FILE; /* When do not streach, report EOT */ clst = create_chain(dj->fs, dj->clust); /* Streach cluster chain */ if (clst == 0) return FR_DENIED; /* No free cluster */ if (clst == 1) return FR_INT_ERR; if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Clean-up streached table */ if (move_window(dj->fs, 0)) return FR_DISK_ERR; /* Flush active window */ mem_set(dj->fs->win, 0, SS(dj->fs)); /* Clear window buffer */ dj->fs->winsect = clust2sect(dj->fs, clst); /* Cluster start sector */ for (c = 0; c < dj->fs->csize; c++) { /* Fill the new cluster with 0 */ dj->fs->wflag = 1; if (move_window(dj->fs, 0)) return FR_DISK_ERR; dj->fs->winsect++; } dj->fs->winsect -= c; /* Rewind window address */ #else return FR_NO_FILE; /* Report EOT */ #endif } dj->clust = clst; /* Initialize data for new cluster */ dj->sect = clust2sect(dj->fs, clst); } } } dj->index = i; dj->dir = dj->fs->win + (i % (SS(dj->fs) / 32)) * 32; return FR_OK; } /*-----------------------------------------------------------------------*/ /* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry */ /*-----------------------------------------------------------------------*/ #if _USE_LFN static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30}; /* Offset of LFN chars in the directory entry */ static BOOL cmp_lfn ( /* TRUE:Matched, FALSE:Not matched */ WCHAR *lfnbuf, /* Pointer to the LFN to be compared */ BYTE *dir /* Pointer to the directory entry containing a part of LFN */ ) { int i, s; WCHAR wc, uc; i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13; /* Get offset in the LFN buffer */ s = 0; wc = 1; do { uc = LD_WORD(dir+LfnOfs[s]); /* Pick an LFN character from the entry */ if (wc) { /* Last char has not been processed */ wc = ff_wtoupper(uc); /* Convert it to upper case */ if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++])) /* Compare it */ return FALSE; /* Not matched */ } else { if (uc != 0xFFFF) return FALSE; /* Check filler */ } } while (++s < 13); /* Repeat until all chars in the entry are checked */ if ((dir[LDIR_Ord] & 0x40) && wc && lfnbuf[i]) /* Last segment matched but different length */ return FALSE; return TRUE; /* The part of LFN matched */ } static BOOL pick_lfn ( /* TRUE:Succeeded, FALSE:Buffer overflow */ WCHAR *lfnbuf, /* Pointer to the Unicode-LFN buffer */ BYTE *dir /* Pointer to the directory entry */ ) { int i, s; WCHAR wc, uc; i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13; /* Offset in the LFN buffer */ s = 0; wc = 1; do { uc = LD_WORD(dir+LfnOfs[s]); /* Pick an LFN character from the entry */ if (wc) { /* Last char has not been processed */ if (i >= _MAX_LFN) return FALSE; /* Buffer overflow? */ lfnbuf[i++] = wc = uc; /* Store it */ } else { if (uc != 0xFFFF) return FALSE; /* Check filler */ } } while (++s < 13); /* Read all character in the entry */ if (dir[LDIR_Ord] & 0x40) { /* Put terminator if it is the last LFN part */ if (i >= _MAX_LFN) return FALSE; /* Buffer overflow? */ lfnbuf[i] = 0; } return TRUE; } #if !_FS_READONLY static void fit_lfn ( const WCHAR *lfnbuf, /* Pointer to the LFN buffer */ BYTE *dir, /* Pointer to the directory entry */ BYTE ord, /* LFN order (1-20) */ BYTE sum /* SFN sum */ ) { int i, s; WCHAR wc; dir[LDIR_Chksum] = sum; /* Set check sum */ dir[LDIR_Attr] = AM_LFN; /* Set attribute. LFN entry */ dir[LDIR_Type] = 0; ST_WORD(dir+LDIR_FstClusLO, 0); i = (ord - 1) * 13; /* Get offset in the LFN buffer */ s = wc = 0; do { if (wc != 0xFFFF) wc = lfnbuf[i++]; /* Get an effective char */ ST_WORD(dir+LfnOfs[s], wc); /* Put it */ if (!wc) wc = 0xFFFF; /* Padding chars following last char */ } while (++s < 13); if (wc == 0xFFFF || !lfnbuf[i]) ord |= 0x40; /* Bottom LFN part is the start of LFN sequence */ dir[LDIR_Ord] = ord; /* Set the LFN order */ } #endif #endif /*-----------------------------------------------------------------------*/ /* Create numbered name */ /*-----------------------------------------------------------------------*/ #if _USE_LFN void gen_numname ( BYTE *dst, /* Pointer to genartated SFN */ const BYTE *src, /* Pointer to source SFN to be modified */ const WCHAR *lfn, /* Pointer to LFN */ WORD num /* Sequense number */ ) { char ns[8]; int i, j; mem_cpy(dst, src, 11); if (num > 5) { /* On many collisions, generate a hash number instead of sequencial number */ do num = (num >> 1) + (num << 15) + (WORD)*lfn++; while (*lfn); } /* itoa */ i = 7; do { ns[i--] = (num % 10) + '0'; num /= 10; } while (num); ns[i] = '~'; /* Append the number */ for (j = 0; j < i && dst[j] != ' '; j++) { if (IsDBCS1(dst[j])) { if (j == i - 1) break; j++; } } do { dst[j++] = (i < 8) ? ns[i++] : ' '; } while (j < 8); } #endif /*-----------------------------------------------------------------------*/ /* Calculate sum of an SFN */ /*-----------------------------------------------------------------------*/ #if _USE_LFN static BYTE sum_sfn ( const BYTE *dir /* Ptr to directory entry */ ) { BYTE sum = 0; int n = 11; do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n); return sum; } #endif /*-----------------------------------------------------------------------*/ /* Directory handling - Find an object in the directory */ /*-----------------------------------------------------------------------*/ static FRESULT dir_find ( DIR *dj /* Pointer to the directory object linked to the file name */ ) { FRESULT res; BYTE c, *dir; #if _USE_LFN BYTE a, ord, sum; #endif res = dir_seek(dj, 0); /* Rewind directory object */ if (res != FR_OK) return res; #if _USE_LFN ord = sum = 0xFF; #endif do { res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; dir = dj->dir; /* Ptr to the directory entry of current index */ c = dir[DIR_Name]; if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */ #if _USE_LFN /* LFN configuration */ a = dir[DIR_Attr] & AM_MASK; if (c == 0xE5 || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */ ord = 0xFF; } else { if (a == AM_LFN) { /* An LFN entry is found */ if (dj->lfn) { if (c & 0x40) { /* Is it start of LFN sequence? */ sum = dir[LDIR_Chksum]; c &= 0xBF; ord = c; /* LFN start order */ dj->lfn_idx = dj->index; } /* Check validity of the LFN entry and compare it with given name */ ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF; } } else { /* An SFN entry is found */ if (!ord && sum == sum_sfn(dir)) break; /* LFN matched? */ ord = 0xFF; dj->lfn_idx = 0xFFFF; /* Reset LFN sequence */ if (!(dj->fn[NS] & NS_LOSS) && !mem_cmp(dir, dj->fn, 11)) break; /* SFN matched? */ } } #else /* Non LFN configuration */ if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */ break; #endif res = dir_next(dj, FALSE); /* Next entry */ } while (res == FR_OK); return res; } /*-----------------------------------------------------------------------*/ /* Read an object from the directory */ /*-----------------------------------------------------------------------*/ #if _FS_MINIMIZE <= 1 static FRESULT dir_read ( DIR *dj /* Pointer to the directory object that pointing the entry to be read */ ) { FRESULT res; BYTE c, *dir; #if _USE_LFN BYTE a, ord = 0xFF, sum = 0xFF; #endif res = FR_NO_FILE; while (dj->sect) { res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; dir = dj->dir; /* Ptr to the directory entry of current index */ c = dir[DIR_Name]; if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */ #if _USE_LFN /* LFN configuration */ a = dir[DIR_Attr] & AM_MASK; if (c == 0xE5 || (!_FS_RPATH && c == '.') || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */ ord = 0xFF; } else { if (a == AM_LFN) { /* An LFN entry is found */ if (c & 0x40) { /* Is it start of LFN sequence? */ sum = dir[LDIR_Chksum]; c &= 0xBF; ord = c; dj->lfn_idx = dj->index; } /* Check LFN validity and capture it */ ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF; } else { /* An SFN entry is found */ if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */ dj->lfn_idx = 0xFFFF; /* It has no LFN. */ break; } } #else /* Non LFN configuration */ if (c != 0xE5 && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */ break; #endif res = dir_next(dj, FALSE); /* Next entry */ if (res != FR_OK) break; } if (res != FR_OK) dj->sect = 0; return res; } #endif /*-----------------------------------------------------------------------*/ /* Register an object to the directory */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static FRESULT dir_register ( /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */ DIR *dj /* Target directory with object name to be created */ ) { FRESULT res; BYTE c, *dir; #if _USE_LFN /* LFN configuration */ WORD n, ne, is; BYTE sn[12], *fn, sum; WCHAR *lfn; fn = dj->fn; lfn = dj->lfn; mem_cpy(sn, fn, 12); if (_FS_RPATH && (sn[NS] & NS_DOT)) return FR_INVALID_NAME; /* Cannot create dot entry */ if (sn[NS] & NS_LOSS) { /* When LFN is out of 8.3 format, generate a numbered name */ fn[NS] = 0; dj->lfn = NULL; /* Find only SFN */ for (n = 1; n < 100; n++) { gen_numname(fn, sn, lfn, n); /* Generate a numbered name */ res = dir_find(dj); /* Check if the name collides with existing SFN */ if (res != FR_OK) break; } if (n == 100) return FR_DENIED; /* Abort if too many collisions */ if (res != FR_NO_FILE) return res; /* Abort if the result is other than 'not collided' */ fn[NS] = sn[NS]; dj->lfn = lfn; } if (sn[NS] & NS_LFN) { /* When LFN is to be created, reserve reserve an SFN + LFN entries. */ for (ne = 0; lfn[ne]; ne++) ; ne = (ne + 25) / 13; } else { /* Otherwise reserve only an SFN entry. */ ne = 1; } /* Reserve contiguous entries */ res = dir_seek(dj, 0); if (res != FR_OK) return res; n = is = 0; do { res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; c = *dj->dir; /* Check the entry status */ if (c == 0xE5 || c == 0) { /* Is it a blank entry? */ if (n == 0) is = dj->index; /* First index of the contigulus entry */ if (++n == ne) break; /* A contiguous entry that requiered count is found */ } else { n = 0; /* Not a blank entry. Restart to search */ } res = dir_next(dj, TRUE); /* Next entry with table streach */ } while (res == FR_OK); if (res == FR_OK && ne > 1) { /* Initialize LFN entry if needed */ res = dir_seek(dj, is); if (res == FR_OK) { sum = sum_sfn(dj->fn); /* Sum of the SFN tied to the LFN */ ne--; do { /* Store LFN entries in bottom first */ res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum); dj->fs->wflag = 1; res = dir_next(dj, FALSE); /* Next entry */ } while (res == FR_OK && --ne); } } #else /* Non LFN configuration */ res = dir_seek(dj, 0); if (res == FR_OK) { do { /* Find a blank entry for the SFN */ res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; c = *dj->dir; if (c == 0xE5 || c == 0) break; /* Is it a blank entry? */ res = dir_next(dj, TRUE); /* Next entry with table streach */ } while (res == FR_OK); } #endif if (res == FR_OK) { /* Initialize the SFN entry */ res = move_window(dj->fs, dj->sect); if (res == FR_OK) { dir = dj->dir; mem_set(dir, 0, 32); /* Clean the entry */ mem_cpy(dir, dj->fn, 11); /* Put SFN */ dir[DIR_NTres] = *(dj->fn+NS) & (NS_BODY | NS_EXT); /* Put NT flag */ dj->fs->wflag = 1; } } return res; } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Remove an object from the directory */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY && !_FS_MINIMIZE static FRESULT dir_remove ( /* FR_OK: Successful, FR_DISK_ERR: A disk error */ DIR *dj /* Directory object pointing the entry to be removed */ ) { FRESULT res; #if _USE_LFN /* LFN configuration */ WORD i; i = dj->index; /* SFN index */ res = dir_seek(dj, (WORD)((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx)); /* Goto the SFN or top of the LFN entries */ if (res == FR_OK) { do { res = move_window(dj->fs, dj->sect); if (res != FR_OK) break; *dj->dir = 0xE5; /* Mark the entry "deleted" */ dj->fs->wflag = 1; if (dj->index >= i) break; /* When reached SFN, all entries of the object has been deleted. */ res = dir_next(dj, FALSE); /* Next entry */ } while (res == FR_OK); if (res == FR_NO_FILE) res = FR_INT_ERR; } #else /* Non LFN configuration */ res = dir_seek(dj, dj->index); if (res == FR_OK) { res = move_window(dj->fs, dj->sect); if (res == FR_OK) { *dj->dir = 0xE5; /* Mark the entry "deleted" */ dj->fs->wflag = 1; } } #endif return res; } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Pick a segment and create the object name in directory form */ /*-----------------------------------------------------------------------*/ static FRESULT create_name ( DIR *dj, /* Pointer to the directory object */ const XCHAR **path /* Pointer to pointer to the segment in the path string */ ) { #ifdef _EXCVT static const BYTE cvt[] = _EXCVT; #endif #if _USE_LFN /* LFN configuration */ BYTE b, cf; WCHAR w, *lfn; int i, ni, si, di; const XCHAR *p; /* Create LFN in Unicode */ si = di = 0; p = *path; lfn = dj->lfn; for (;;) { w = p[si++]; /* Get a character */ if (w < ' ' || w == '/' || w == '\\') break; /* Break on end of segment */ if (di >= _MAX_LFN) /* Reject too long name */ return FR_INVALID_NAME; #if !_LFN_UNICODE w &= 0xFF; if (IsDBCS1(w)) { /* If it is a DBC 1st byte */ b = p[si++]; /* Get 2nd byte */ if (!IsDBCS2(b)) /* Reject invalid code for DBC */ return FR_INVALID_NAME; w = (w << 8) + b; } w = ff_convert(w, 1); /* Convert OEM to Unicode */ if (!w) return FR_INVALID_NAME; /* Reject invalid code */ #endif if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */ return FR_INVALID_NAME; lfn[di++] = w; /* Store the Unicode char */ } *path = &p[si]; /* Rerurn pointer to the next segment */ cf = (w < ' ') ? NS_LAST : 0; /* Set last segment flag if end of path */ #if _FS_RPATH if ((di == 1 && lfn[di - 1] == '.') || /* Is this a dot entry? */ (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) { lfn[di] = 0; for (i = 0; i < 11; i++) dj->fn[i] = (i < di) ? '.' : ' '; dj->fn[i] = cf | NS_DOT; /* This is a dot entry */ return FR_OK; } #endif while (di) { /* Strip trailing spaces and dots */ w = lfn[di - 1]; if (w != ' ' && w != '.') break; di--; } if (!di) return FR_INVALID_NAME; /* Reject null string */ lfn[di] = 0; /* LFN is created */ /* Create SFN in directory form */ mem_set(dj->fn, ' ', 11); for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ; /* Strip leading spaces and dots */ if (si) cf |= NS_LOSS | NS_LFN; while (di && lfn[di - 1] != '.') di--; /* Find extension (di<=si: no extension) */ b = i = 0; ni = 8; for (;;) { w = lfn[si++]; /* Get an LFN char */ if (!w) break; /* Break on enf of the LFN */ if (w == ' ' || (w == '.' && si != di)) { /* Remove spaces and dots */ cf |= NS_LOSS | NS_LFN; continue; } if (i >= ni || si == di) { /* Extension or end of SFN */ if (ni == 11) { /* Long extension */ cf |= NS_LOSS | NS_LFN; break; } if (si != di) cf |= NS_LOSS | NS_LFN; /* Out of 8.3 format */ if (si > di) break; /* No extension */ si = di; i = 8; ni = 11; /* Enter extension section */ b <<= 2; continue; } if (w >= 0x80) { /* Non ASCII char */ #ifdef _EXCVT w = ff_convert(w, 0); /* Unicode -> OEM code */ if (w) w = cvt[w - 0x80]; /* Convert extended char to upper (SBCS) */ #else w = ff_convert(ff_wtoupper(w), 0); /* Upper converted Unicode -> OEM code */ #endif cf |= NS_LFN; /* Force create LFN entry */ } if (_DF1S && w >= 0x100) { /* Double byte char */ if (i >= ni - 1) { cf |= NS_LOSS | NS_LFN; i = ni; continue; } dj->fn[i++] = (BYTE)(w >> 8); } else { /* Single byte char */ if (!w || chk_chr("+,;[=]", w)) { /* Replace illegal chars for SFN */ w = '_'; cf |= NS_LOSS | NS_LFN; /* Lossy conversion */ } else { if (IsUpper(w)) { /* ASCII large capital */ b |= 2; } else { if (IsLower(w)) { /* ASCII small capital */ b |= 1; w -= 0x20; } } } } dj->fn[i++] = (BYTE)w; } if (dj->fn[0] == 0xE5) dj->fn[0] = 0x05; /* If the first char collides with deleted mark, replace it with 0x05 */ if (ni == 8) b <<= 2; if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) /* Create LFN entry when there are composite capitals */ cf |= NS_LFN; if (!(cf & NS_LFN)) { /* When LFN is in 8.3 format without extended char, NT flags are created */ if ((b & 0x03) == 0x01) cf |= NS_EXT; /* NT flag (Extension has only small capital) */ if ((b & 0x0C) == 0x04) cf |= NS_BODY; /* NT flag (Filename has only small capital) */ } dj->fn[NS] = cf; /* SFN is created */ return FR_OK; #else /* Non-LFN configuration */ BYTE b, c, d, *sfn; int ni, si, i; const char *p; /* Create file name in directory form */ sfn = dj->fn; mem_set(sfn, ' ', 11); si = i = b = 0; ni = 8; p = *path; #if _FS_RPATH if (p[si] == '.') { /* Is this a dot entry? */ for (;;) { c = p[si++]; if (c != '.' || si >= 3) break; sfn[i++] = c; } if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME; *path = &p[si]; /* Rerurn pointer to the next segment */ sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT; /* Set last segment flag if end of path */ return FR_OK; } #endif for (;;) { c = p[si++]; if (c <= ' ' || c == '/' || c == '\\') break; /* Break on end of segment */ if (c == '.' || i >= ni) { if (ni != 8 || c != '.') return FR_INVALID_NAME; i = 8; ni = 11; b <<= 2; continue; } if (c >= 0x80) { /* Extended char */ #ifdef _EXCVT c = cvt[c - 0x80]; /* Convert extend char (SBCS) */ #else b |= 3; /* Eliminate NT flag if ext char is exist */ #if !_DF1S /* ASCII only cfg */ return FR_INVALID_NAME; #endif #endif } if (IsDBCS1(c)) { /* DBC 1st byte? */ d = p[si++]; /* Get 2nd byte */ if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */ return FR_INVALID_NAME; sfn[i++] = c; sfn[i++] = d; } else { /* Single byte code */ if (chk_chr(" \"*+,[=]|\x7F", c)) /* Reject illegal chrs for SFN */ return FR_INVALID_NAME; if (IsUpper(c)) { /* ASCII large capital? */ b |= 2; } else { if (IsLower(c)) { /* ASCII small capital? */ b |= 1; c -= 0x20; } } sfn[i++] = c; } } *path = &p[si]; /* Rerurn pointer to the next segment */ c = (c <= ' ') ? NS_LAST : 0; /* Set last segment flag if end of path */ if (!i) return FR_INVALID_NAME; /* Reject null string */ if (sfn[0] == 0xE5) sfn[0] = 0x05; /* When first char collides with 0xE5, replace it with 0x05 */ if (ni == 8) b <<= 2; if ((b & 0x03) == 0x01) c |= NS_EXT; /* NT flag (Extension has only small capital) */ if ((b & 0x0C) == 0x04) c |= NS_BODY; /* NT flag (Filename has only small capital) */ sfn[NS] = c; /* Store NT flag, File name is created */ return FR_OK; #endif } /*-----------------------------------------------------------------------*/ /* Get file information from directory entry */ /*-----------------------------------------------------------------------*/ #if _FS_MINIMIZE <= 1 static void get_fileinfo ( /* No return code */ DIR *dj, /* Pointer to the directory object */ FILINFO *fno /* Pointer to the file information to be filled */ ) { int i; BYTE c, nt, *dir; char *p; p = fno->fname; if (dj->sect) { dir = dj->dir; nt = dir[DIR_NTres]; /* NT flag */ for (i = 0; i < 8; i++) { /* Copy name body */ c = dir[i]; if (c == ' ') break; if (c == 0x05) c = 0xE5; if (_USE_LFN && (nt & NS_BODY) && IsUpper(c)) c += 0x20; *p++ = c; } if (dir[8] != ' ') { /* Copy name extension */ *p++ = '.'; for (i = 8; i < 11; i++) { c = dir[i]; if (c == ' ') break; if (_USE_LFN && (nt & NS_EXT) && IsUpper(c)) c += 0x20; *p++ = c; } } fno->fattrib = dir[DIR_Attr]; /* Attribute */ fno->fsize = LD_DWORD(dir+DIR_FileSize); /* Size */ fno->fdate = LD_WORD(dir+DIR_WrtDate); /* Date */ fno->ftime = LD_WORD(dir+DIR_WrtTime); /* Time */ } *p = 0; #if _USE_LFN if (fno->lfname) { XCHAR *tp = fno->lfname; WCHAR w, *lfn; i = 0; if (dj->sect && dj->lfn_idx != 0xFFFF) {/* Get LFN if available */ lfn = dj->lfn; while ((w = *lfn++) != 0) { /* Get an LFN char */ #if !_LFN_UNICODE w = ff_convert(w, 0); /* Unicode -> OEM conversion */ if (!w) { i = 0; break; } /* Could not convert, no LFN */ if (_DF1S && w >= 0x100) /* Put 1st byte if it is a DBC */ tp[i++] = (XCHAR)(w >> 8); #endif if (i >= fno->lfsize - 1) { i = 0; break; } /* Buffer overrun, no LFN */ tp[i++] = (XCHAR)w; } } tp[i] = 0; /* Terminator */ } #endif } #endif /* _FS_MINIMIZE <= 1 */ /*-----------------------------------------------------------------------*/ /* Follow a file path */ /*-----------------------------------------------------------------------*/ static FRESULT follow_path ( /* FR_OK(0): successful, !=0: error code */ DIR *dj, /* Directory object to return last directory and found object */ const XCHAR *path /* Full-path string to find a file or directory */ ) { FRESULT res; BYTE *dir, last; while (!_USE_LFN && *path == ' ') path++; /* Skip leading spaces */ #if _FS_RPATH if (*path == '/' || *path == '\\') { /* There is a heading separator */ path++; dj->sclust = 0; /* Strip it and start from the root dir */ } else { /* No heading saparator */ dj->sclust = dj->fs->cdir; /* Start from the current dir */ } #else if (*path == '/' || *path == '\\') /* Strip heading separator if exist */ path++; dj->sclust = 0; /* Start from the root dir */ #endif if ((UINT)*path < ' ') { /* Null path means the start directory itself */ res = dir_seek(dj, 0); dj->dir = NULL; } else { /* Follow path */ for (;;) { res = create_name(dj, &path); /* Get a segment */ if (res != FR_OK) break; res = dir_find(dj); /* Find it */ last = *(dj->fn+NS) & NS_LAST; if (res != FR_OK) { /* Could not find the object */ if (res == FR_NO_FILE && !last) res = FR_NO_PATH; break; } if (last) break; /* Last segment match. Function completed. */ dir = dj->dir; /* There is next segment. Follow the sub directory */ if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */ res = FR_NO_PATH; break; } dj->sclust = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); } } return res; } /*-----------------------------------------------------------------------*/ /* Load boot record and check if it is an FAT boot record */ /*-----------------------------------------------------------------------*/ static BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */ FATFS *fs, /* File system object */ DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */ ) { if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK) /* Load boot record */ return 3; if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature (always placed at offset 510 even if the sector size is >512) */ return 2; if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146) /* Check "FAT" string */ return 0; if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146) return 0; return 1; } /*-----------------------------------------------------------------------*/ /* Make sure that the file system is valid */ /*-----------------------------------------------------------------------*/ FRESULT chk_mounted ( /* FR_OK(0): successful, !=0: any error occured */ const XCHAR **path, /* Pointer to pointer to the path name (drive number) */ FATFS **rfs, /* Pointer to pointer to the found file system object */ BYTE chk_wp /* !=0: Check media write protection for write access */ ) { BYTE fmt, *tbl; UINT vol; DSTATUS stat; DWORD bsect, fsize, tsect, mclst; const XCHAR *p = *path; FATFS *fs; /* Get logical drive number from the path name */ vol = p[0] - '0'; /* Is there a drive number? */ if (vol <= 9 && p[1] == ':') { /* Found a drive number, get and strip it */ p += 2; *path = p; /* Return pointer to the path name */ } else { /* No drive number is given */ #if _FS_RPATH vol = Drive; /* Use current drive */ #else vol = 0; /* Use drive 0 */ #endif } /* Check if the logical drive is valid or not */ if (vol >= _DRIVES) /* Is the drive number valid? */ return FR_INVALID_DRIVE; *rfs = fs = FatFs[vol]; /* Returen pointer to the corresponding file system object */ if (!fs) return FR_NOT_ENABLED; /* Is the file system object available? */ ENTER_FF(fs); /* Lock file system */ if (fs->fs_type) { /* If the logical drive has been mounted */ stat = disk_status(fs->drive); if (!(stat & STA_NOINIT)) { /* and the physical drive is kept initialized (has not been changed), */ #if !_FS_READONLY if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */ return FR_WRITE_PROTECTED; #endif return FR_OK; /* The file system object is valid */ } } /* The logical drive must be mounted. Following code attempts to mount the volume */ fs->fs_type = 0; /* Clear the file system object */ fs->drive = (BYTE)LD2PD(vol); /* Bind the logical drive and a physical drive */ stat = disk_initialize(fs->drive); /* Initialize low level disk I/O layer */ if (stat & STA_NOINIT) /* Check if the drive is ready */ return FR_NOT_READY; #if _MAX_SS != 512 /* Get disk sector size if needed */ if (disk_ioctl(fs->drive, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS) return FR_NO_FILESYSTEM; #endif #if !_FS_READONLY if (chk_wp && (stat & STA_PROTECT)) /* Check disk write protection if needed */ return FR_WRITE_PROTECTED; #endif /* Search FAT partition on the drive */ fmt = check_fs(fs, bsect = 0); /* Check sector 0 as an SFD format */ if (fmt == 1) { /* Not an FAT boot record, it may be patitioned */ /* Check a partition listed in top of the partition table */ tbl = &fs->win[MBR_Table + LD2PT(vol) * 16]; /* Partition table */ if (tbl[4]) { /* Is the partition existing? */ bsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */ fmt = check_fs(fs, bsect); /* Check the partition */ } } if (fmt == 3) return FR_DISK_ERR; if (fmt || LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs)) /* No valid FAT patition is found */ return FR_NO_FILESYSTEM; /* Initialize the file system object */ fsize = LD_WORD(fs->win+BPB_FATSz16); /* Number of sectors per FAT */ if (!fsize) fsize = LD_DWORD(fs->win+BPB_FATSz32); fs->sects_fat = fsize; fs->n_fats = fs->win[BPB_NumFATs]; /* Number of FAT copies */ fsize *= fs->n_fats; /* (Number of sectors in FAT area) */ fs->fatbase = bsect + LD_WORD(fs->win+BPB_RsvdSecCnt); /* FAT start sector (lba) */ fs->csize = fs->win[BPB_SecPerClus]; /* Number of sectors per cluster */ fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt); /* Nmuber of root directory entries */ tsect = LD_WORD(fs->win+BPB_TotSec16); /* Number of sectors on the volume */ if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32); fs->max_clust = mclst = (tsect /* Last cluster# + 1 (Number of clusters + 2) */ - LD_WORD(fs->win+BPB_RsvdSecCnt) - fsize - fs->n_rootdir / (SS(fs)/32) ) / fs->csize + 2; fmt = FS_FAT12; /* Determine the FAT sub type */ if (mclst >= 0xFF7) fmt = FS_FAT16; /* Number of clusters >= 0xFF5 */ if (mclst >= 0xFFF7) fmt = FS_FAT32; /* Number of clusters >= 0xFFF5 */ if (fmt == FS_FAT32) fs->dirbase = LD_DWORD(fs->win+BPB_RootClus); /* Root directory start cluster */ else fs->dirbase = fs->fatbase + fsize; /* Root directory start sector (lba) */ fs->database = fs->fatbase + fsize + fs->n_rootdir / (SS(fs)/32); /* Data start sector (lba) */ #if !_FS_READONLY /* Initialize allocation information */ fs->free_clust = 0xFFFFFFFF; fs->wflag = 0; /* Get fsinfo if needed */ if (fmt == FS_FAT32) { fs->fsi_flag = 0; fs->fsi_sector = bsect + LD_WORD(fs->win+BPB_FSInfo); if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK && LD_WORD(fs->win+BS_55AA) == 0xAA55 && LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252 && LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272) { fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free); fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count); } } #endif fs->fs_type = fmt; /* FAT sub-type */ fs->winsect = 0; /* Invalidate sector cache */ #if _FS_RPATH fs->cdir = 0; /* Current directory (root dir) */ #endif fs->id = ++Fsid; /* File system mount ID */ return FR_OK; } /*-----------------------------------------------------------------------*/ /* Check if the file/dir object is valid or not */ /*-----------------------------------------------------------------------*/ static FRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */ FATFS *fs, /* Pointer to the file system object */ WORD id /* Member id of the target object to be checked */ ) { if (!fs || !fs->fs_type || fs->id != id) return FR_INVALID_OBJECT; ENTER_FF(fs); /* Lock file system */ if (disk_status(fs->drive) & STA_NOINIT) return FR_NOT_READY; return FR_OK; } /*-------------------------------------------------------------------------- Public Functions --------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------*/ /* Mount/Unmount a Locical Drive */ /*-----------------------------------------------------------------------*/ FRESULT f_mount ( BYTE vol, /* Logical drive number to be mounted/unmounted */ FATFS *fs /* Pointer to new file system object (NULL for unmount)*/ ) { FATFS *rfs; if (vol >= _DRIVES) /* Check if the drive number is valid */ return FR_INVALID_DRIVE; rfs = FatFs[vol]; /* Get current fs object */ if (rfs) { #if _FS_REENTRANT /* Discard sync object of the current volume */ if (!ff_del_syncobj(rfs->sobj)) return FR_INT_ERR; #endif rfs->fs_type = 0; /* Clear old fs object */ } if (fs) { fs->fs_type = 0; /* Clear new fs object */ #if _FS_REENTRANT /* Create sync object for the new volume */ if (!ff_cre_syncobj(vol, &fs->sobj)) return FR_INT_ERR; #endif } FatFs[vol] = fs; /* Register new fs object */ return FR_OK; } /*-----------------------------------------------------------------------*/ /* Open or Create a File */ /*-----------------------------------------------------------------------*/ FRESULT f_open ( FIL *fp, /* Pointer to the blank file object */ const XCHAR *path, /* Pointer to the file name */ BYTE mode /* Access mode and file open mode flags */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); BYTE *dir; fp->fs = NULL; /* Clear file object */ #if !_FS_READONLY mode &= (FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW); res = chk_mounted(&path, &dj.fs, (BYTE)(mode & (FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW))); #else mode &= FA_READ; res = chk_mounted(&path, &dj.fs, 0); #endif if (res != FR_OK) LEAVE_FF(dj.fs, res); INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ #if !_FS_READONLY /* Create or Open a file */ if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) { DWORD ps, cl; if (res != FR_OK) { /* No file, create new */ if (res == FR_NO_FILE) /* There is no file to open, create a new entry */ res = dir_register(&dj); if (res != FR_OK) LEAVE_FF(dj.fs, res); mode |= FA_CREATE_ALWAYS; dir = dj.dir; /* Created entry (SFN entry) */ } else { /* Any object is already existing */ if (mode & FA_CREATE_NEW) /* Cannot create new */ LEAVE_FF(dj.fs, FR_EXIST); dir = dj.dir; if (!dir || (dir[DIR_Attr] & (AM_RDO | AM_DIR))) /* Cannot overwrite it (R/O or DIR) */ LEAVE_FF(dj.fs, FR_DENIED); if (mode & FA_CREATE_ALWAYS) { /* Resize it to zero on over write mode */ cl = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); /* Get start cluster */ ST_WORD(dir+DIR_FstClusHI, 0); /* cluster = 0 */ ST_WORD(dir+DIR_FstClusLO, 0); ST_DWORD(dir+DIR_FileSize, 0); /* size = 0 */ dj.fs->wflag = 1; ps = dj.fs->winsect; /* Remove the cluster chain */ if (cl) { res = remove_chain(dj.fs, cl); if (res) LEAVE_FF(dj.fs, res); dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */ } res = move_window(dj.fs, ps); if (res != FR_OK) LEAVE_FF(dj.fs, res); } } if (mode & FA_CREATE_ALWAYS) { dir[DIR_Attr] = 0; /* Reset attribute */ ps = get_fattime(); ST_DWORD(dir+DIR_CrtTime, ps); /* Created time */ dj.fs->wflag = 1; mode |= FA__WRITTEN; /* Set file changed flag */ } } /* Open an existing file */ else { #endif /* !_FS_READONLY */ if (res != FR_OK) LEAVE_FF(dj.fs, res); /* Follow failed */ dir = dj.dir; if (!dir || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */ LEAVE_FF(dj.fs, FR_NO_FILE); #if !_FS_READONLY if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */ LEAVE_FF(dj.fs, FR_DENIED); } fp->dir_sect = dj.fs->winsect; /* Pointer to the directory entry */ fp->dir_ptr = dj.dir; #endif fp->flag = mode; /* File access mode */ fp->org_clust = /* File start cluster */ ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); fp->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */ fp->fptr = 0; fp->csect = 255; /* File pointer */ fp->dsect = 0; fp->fs = dj.fs; fp->id = dj.fs->id; /* Owner file system object of the file */ LEAVE_FF(dj.fs, FR_OK); } /*-----------------------------------------------------------------------*/ /* Read File */ /*-----------------------------------------------------------------------*/ FRESULT f_read ( FIL *fp, /* Pointer to the file object */ void *buff, /* Pointer to data buffer */ UINT btr, /* Number of bytes to read */ UINT *br /* Pointer to number of bytes read */ ) { FRESULT res; DWORD clst, sect, remain; UINT rcnt, cc; BYTE *rbuff = buff; *br = 0; /* Initialize bytes read */ res = validate(fp->fs, fp->id); /* Check validity of the object */ if (res != FR_OK) LEAVE_FF(fp->fs, res); if (fp->flag & FA__ERROR) /* Check abort flag */ LEAVE_FF(fp->fs, FR_INT_ERR); if (!(fp->flag & FA_READ)) /* Check access mode */ LEAVE_FF(fp->fs, FR_DENIED); remain = fp->fsize - fp->fptr; if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */ for ( ; btr; /* Repeat until all data transferred */ rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) { if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */ if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */ clst = (fp->fptr == 0) ? /* On the top of the file? */ fp->org_clust : get_fat(fp->fs, fp->curr_clust); if (clst <= 1) ABORT(fp->fs, FR_INT_ERR); if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR); fp->curr_clust = clst; /* Update current cluster */ fp->csect = 0; /* Reset sector offset in the cluster */ } sect = clust2sect(fp->fs, fp->curr_clust); /* Get current sector */ if (!sect) ABORT(fp->fs, FR_INT_ERR); sect += fp->csect; cc = btr / SS(fp->fs); /* When remaining bytes >= sector size, */ if (cc) { /* Read maximum contiguous sectors directly */ if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */ cc = fp->fs->csize - fp->csect; if (disk_read(fp->fs->drive, rbuff, sect, (BYTE)cc) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); #if !_FS_READONLY && _FS_MINIMIZE <= 2 #if _FS_TINY if (fp->fs->wflag && fp->fs->winsect - sect < cc) /* Replace one of the read sectors with cached data if it contains a dirty sector */ mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs)); #else if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc) /* Replace one of the read sectors with cached data if it contains a dirty sector */ mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs)); #endif #endif fp->csect += (BYTE)cc; /* Next sector address in the cluster */ rcnt = SS(fp->fs) * cc; /* Number of bytes transferred */ continue; } #if !_FS_TINY #if !_FS_READONLY if (fp->flag & FA__DIRTY) { /* Write sector I/O buffer if needed */ if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); fp->flag &= ~FA__DIRTY; } #endif if (fp->dsect != sect) { /* Fill sector buffer with file data */ if (disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); } #endif fp->dsect = sect; fp->csect++; /* Next sector address in the cluster */ } rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Get partial sector data from sector buffer */ if (rcnt > btr) rcnt = btr; #if _FS_TINY if (move_window(fp->fs, fp->dsect)) /* Move sector window */ ABORT(fp->fs, FR_DISK_ERR); mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt); /* Pick partial sector */ #else mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt); /* Pick partial sector */ #endif } LEAVE_FF(fp->fs, FR_OK); } #if !_FS_READONLY /*-----------------------------------------------------------------------*/ /* Write File */ /*-----------------------------------------------------------------------*/ FRESULT f_write ( FIL *fp, /* Pointer to the file object */ const void *buff, /* Pointer to the data to be written */ UINT btw, /* Number of bytes to write */ UINT *bw /* Pointer to number of bytes written */ ) { FRESULT res; DWORD clst, sect; UINT wcnt, cc; const BYTE *wbuff = buff; *bw = 0; /* Initialize bytes written */ res = validate(fp->fs, fp->id); /* Check validity of the object */ if (res != FR_OK) LEAVE_FF(fp->fs, res); if (fp->flag & FA__ERROR) /* Check abort flag */ LEAVE_FF(fp->fs, FR_INT_ERR); if (!(fp->flag & FA_WRITE)) /* Check access mode */ LEAVE_FF(fp->fs, FR_DENIED); if (fp->fsize + btw < fp->fsize) btw = 0; /* File size cannot reach 4GB */ for ( ; btw; /* Repeat until all data transferred */ wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) { if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */ if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */ if (fp->fptr == 0) { /* On the top of the file? */ clst = fp->org_clust; /* Follow from the origin */ if (clst == 0) /* When there is no cluster chain, */ fp->org_clust = clst = create_chain(fp->fs, 0); /* Create a new cluster chain */ } else { /* Middle or end of the file */ clst = create_chain(fp->fs, fp->curr_clust); /* Follow or streach cluster chain */ } if (clst == 0) break; /* Could not allocate a new cluster (disk full) */ if (clst == 1) ABORT(fp->fs, FR_INT_ERR); if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR); fp->curr_clust = clst; /* Update current cluster */ fp->csect = 0; /* Reset sector address in the cluster */ } #if _FS_TINY if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0)) /* Write back data buffer prior to following direct transfer */ ABORT(fp->fs, FR_DISK_ERR); #else if (fp->flag & FA__DIRTY) { /* Write back data buffer prior to following direct transfer */ if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); fp->flag &= ~FA__DIRTY; } #endif sect = clust2sect(fp->fs, fp->curr_clust); /* Get current sector */ if (!sect) ABORT(fp->fs, FR_INT_ERR); sect += fp->csect; cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */ if (cc) { /* Write maximum contiguous sectors directly */ if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */ cc = fp->fs->csize - fp->csect; if (disk_write(fp->fs->drive, wbuff, sect, (BYTE)cc) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); #if _FS_TINY if (fp->fs->winsect - sect < cc) { /* Refill sector cache if it gets dirty by the direct write */ mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs)); fp->fs->wflag = 0; } #else if (fp->dsect - sect < cc) { /* Refill sector cache if it gets dirty by the direct write */ mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs)); fp->flag &= ~FA__DIRTY; } #endif fp->csect += (BYTE)cc; /* Next sector address in the cluster */ wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */ continue; } #if _FS_TINY if (fp->fptr >= fp->fsize) { /* Avoid silly buffer filling at growing edge */ if (move_window(fp->fs, 0)) ABORT(fp->fs, FR_DISK_ERR); fp->fs->winsect = sect; } #else if (fp->dsect != sect) { /* Fill sector buffer with file data */ if (fp->fptr < fp->fsize && disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); } #endif fp->dsect = sect; fp->csect++; /* Next sector address in the cluster */ } wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Put partial sector into file I/O buffer */ if (wcnt > btw) wcnt = btw; #if _FS_TINY if (move_window(fp->fs, fp->dsect)) /* Move sector window */ ABORT(fp->fs, FR_DISK_ERR); mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */ fp->fs->wflag = 1; #else mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */ fp->flag |= FA__DIRTY; #endif } if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */ fp->flag |= FA__WRITTEN; /* Set file changed flag */ LEAVE_FF(fp->fs, FR_OK); } /*-----------------------------------------------------------------------*/ /* Synchronize the File Object */ /*-----------------------------------------------------------------------*/ FRESULT f_sync ( FIL *fp /* Pointer to the file object */ ) { FRESULT res; DWORD tim; BYTE *dir; res = validate(fp->fs, fp->id); /* Check validity of the object */ if (res == FR_OK) { if (fp->flag & FA__WRITTEN) { /* Has the file been written? */ #if !_FS_TINY /* Write-back dirty buffer */ if (fp->flag & FA__DIRTY) { if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK) LEAVE_FF(fp->fs, FR_DISK_ERR); fp->flag &= ~FA__DIRTY; } #endif /* Update the directory entry */ res = move_window(fp->fs, fp->dir_sect); if (res == FR_OK) { dir = fp->dir_ptr; dir[DIR_Attr] |= AM_ARC; /* Set archive bit */ ST_DWORD(dir+DIR_FileSize, fp->fsize); /* Update file size */ ST_WORD(dir+DIR_FstClusLO, fp->org_clust); /* Update start cluster */ ST_WORD(dir+DIR_FstClusHI, fp->org_clust >> 16); tim = get_fattime(); /* Updated time */ ST_DWORD(dir+DIR_WrtTime, tim); fp->flag &= ~FA__WRITTEN; fp->fs->wflag = 1; res = sync(fp->fs); } } } LEAVE_FF(fp->fs, res); } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Close File */ /*-----------------------------------------------------------------------*/ FRESULT f_close ( FIL *fp /* Pointer to the file object to be closed */ ) { FRESULT res; #if _FS_READONLY res = validate(fp->fs, fp->id); if (res == FR_OK) fp->fs = NULL; LEAVE_FF(fp->fs, res); #else res = f_sync(fp); if (res == FR_OK) fp->fs = NULL; return res; #endif } /*-----------------------------------------------------------------------*/ /* Change Current Drive/Directory */ /*-----------------------------------------------------------------------*/ #if _FS_RPATH FRESULT f_chdrive ( BYTE drv /* Drive number */ ) { if (drv >= _DRIVES) return FR_INVALID_DRIVE; Drive = drv; return FR_OK; } FRESULT f_chdir ( const XCHAR *path /* Pointer to the directory path */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); BYTE *dir; res = chk_mounted(&path, &dj.fs, 0); if (res == FR_OK) { INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (res == FR_OK) { /* Follow completed */ dir = dj.dir; /* Pointer to the entry */ if (!dir) { dj.fs->cdir = 0; /* No entry (root dir) */ } else { if (dir[DIR_Attr] & AM_DIR) /* Reached to the dir */ dj.fs->cdir = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); else res = FR_NO_PATH; /* Could not reach the dir (it is a file) */ } } if (res == FR_NO_FILE) res = FR_NO_PATH; } LEAVE_FF(dj.fs, res); } #endif #if _FS_MINIMIZE <= 2 /*-----------------------------------------------------------------------*/ /* Seek File R/W Pointer */ /*-----------------------------------------------------------------------*/ FRESULT f_lseek ( FIL *fp, /* Pointer to the file object */ DWORD ofs /* File pointer from top of file */ ) { FRESULT res; DWORD clst, bcs, nsect, ifptr; res = validate(fp->fs, fp->id); /* Check validity of the object */ if (res != FR_OK) LEAVE_FF(fp->fs, res); if (fp->flag & FA__ERROR) /* Check abort flag */ LEAVE_FF(fp->fs, FR_INT_ERR); if (ofs > fp->fsize /* In read-only mode, clip offset with the file size */ #if !_FS_READONLY && !(fp->flag & FA_WRITE) #endif ) ofs = fp->fsize; ifptr = fp->fptr; fp->fptr = nsect = 0; fp->csect = 255; if (ofs > 0) { bcs = (DWORD)fp->fs->csize * SS(fp->fs); /* Cluster size (byte) */ if (ifptr > 0 && (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */ fp->fptr = (ifptr - 1) & ~(bcs - 1); /* start from the current cluster */ ofs -= fp->fptr; clst = fp->curr_clust; } else { /* When seek to back cluster, */ clst = fp->org_clust; /* start from the first cluster */ #if !_FS_READONLY if (clst == 0) { /* If no cluster chain, create a new chain */ clst = create_chain(fp->fs, 0); if (clst == 1) ABORT(fp->fs, FR_INT_ERR); if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR); fp->org_clust = clst; } #endif fp->curr_clust = clst; } if (clst != 0) { while (ofs > bcs) { /* Cluster following loop */ #if !_FS_READONLY if (fp->flag & FA_WRITE) { /* Check if in write mode or not */ clst = create_chain(fp->fs, clst); /* Force streached if in write mode */ if (clst == 0) { /* When disk gets full, clip file size */ ofs = bcs; break; } } else #endif clst = get_fat(fp->fs, clst); /* Follow cluster chain if not in write mode */ if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR); if (clst <= 1 || clst >= fp->fs->max_clust) ABORT(fp->fs, FR_INT_ERR); fp->curr_clust = clst; fp->fptr += bcs; ofs -= bcs; } fp->fptr += ofs; fp->csect = (BYTE)(ofs / SS(fp->fs)); /* Sector offset in the cluster */ if (ofs % SS(fp->fs)) { nsect = clust2sect(fp->fs, clst); /* Current sector */ if (!nsect) ABORT(fp->fs, FR_INT_ERR); nsect += fp->csect; fp->csect++; } } } if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) { #if !_FS_TINY #if !_FS_READONLY if (fp->flag & FA__DIRTY) { /* Write-back dirty buffer if needed */ if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); fp->flag &= ~FA__DIRTY; } #endif if (disk_read(fp->fs->drive, fp->buf, nsect, 1) != RES_OK) ABORT(fp->fs, FR_DISK_ERR); #endif fp->dsect = nsect; } #if !_FS_READONLY if (fp->fptr > fp->fsize) { /* Set changed flag if the file size is extended */ fp->fsize = fp->fptr; fp->flag |= FA__WRITTEN; } #endif LEAVE_FF(fp->fs, res); } #if _FS_MINIMIZE <= 1 /*-----------------------------------------------------------------------*/ /* Create a Directroy Object */ /*-----------------------------------------------------------------------*/ FRESULT f_opendir ( DIR *dj, /* Pointer to directory object to create */ const XCHAR *path /* Pointer to the directory path */ ) { FRESULT res; NAMEBUF(sfn, lfn); BYTE *dir; res = chk_mounted(&path, &dj->fs, 0); if (res == FR_OK) { INITBUF((*dj), sfn, lfn); res = follow_path(dj, path); /* Follow the path to the directory */ if (res == FR_OK) { /* Follow completed */ dir = dj->dir; if (dir) { /* It is not the root dir */ if (dir[DIR_Attr] & AM_DIR) { /* The object is a directory */ dj->sclust = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); } else { /* The object is not a directory */ res = FR_NO_PATH; } } if (res == FR_OK) { dj->id = dj->fs->id; res = dir_seek(dj, 0); /* Rewind dir */ } } if (res == FR_NO_FILE) res = FR_NO_PATH; } LEAVE_FF(dj->fs, res); } /*-----------------------------------------------------------------------*/ /* Read Directory Entry in Sequense */ /*-----------------------------------------------------------------------*/ FRESULT f_readdir ( DIR *dj, /* Pointer to the open directory object */ FILINFO *fno /* Pointer to file information to return */ ) { FRESULT res; NAMEBUF(sfn, lfn); res = validate(dj->fs, dj->id); /* Check validity of the object */ if (res == FR_OK) { INITBUF((*dj), sfn, lfn); if (!fno) { res = dir_seek(dj, 0); } else { res = dir_read(dj); if (res == FR_NO_FILE) { dj->sect = 0; res = FR_OK; } if (res == FR_OK) { /* A valid entry is found */ get_fileinfo(dj, fno); /* Get the object information */ res = dir_next(dj, FALSE); /* Increment index for next */ if (res == FR_NO_FILE) { dj->sect = 0; res = FR_OK; } } } } LEAVE_FF(dj->fs, res); } #if _FS_MINIMIZE == 0 /*-----------------------------------------------------------------------*/ /* Get File Status */ /*-----------------------------------------------------------------------*/ FRESULT f_stat ( const XCHAR *path, /* Pointer to the file path */ FILINFO *fno /* Pointer to file information to return */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); res = chk_mounted(&path, &dj.fs, 0); if (res == FR_OK) { INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (res == FR_OK) { /* Follwo completed */ if (dj.dir) /* Found an object */ get_fileinfo(&dj, fno); else /* It is root dir */ res = FR_INVALID_NAME; } } LEAVE_FF(dj.fs, res); } #if !_FS_READONLY /*-----------------------------------------------------------------------*/ /* Get Number of Free Clusters */ /*-----------------------------------------------------------------------*/ FRESULT f_getfree ( const XCHAR *path, /* Pointer to the logical drive number (root dir) */ DWORD *nclst, /* Pointer to the variable to return number of free clusters */ FATFS **fatfs /* Pointer to pointer to corresponding file system object to return */ ) { FRESULT res; DWORD n, clst, sect, stat; UINT i; BYTE fat, *p; /* Get drive number */ res = chk_mounted(&path, fatfs, 0); if (res != FR_OK) LEAVE_FF(*fatfs, res); /* If number of free cluster is valid, return it without cluster scan. */ if ((*fatfs)->free_clust <= (*fatfs)->max_clust - 2) { *nclst = (*fatfs)->free_clust; LEAVE_FF(*fatfs, FR_OK); } /* Get number of free clusters */ fat = (*fatfs)->fs_type; n = 0; if (fat == FS_FAT12) { clst = 2; do { stat = get_fat(*fatfs, clst); if (stat == 0xFFFFFFFF) LEAVE_FF(*fatfs, FR_DISK_ERR); if (stat == 1) LEAVE_FF(*fatfs, FR_INT_ERR); if (stat == 0) n++; } while (++clst < (*fatfs)->max_clust); } else { clst = (*fatfs)->max_clust; sect = (*fatfs)->fatbase; i = 0; p = 0; do { if (!i) { res = move_window(*fatfs, sect++); if (res != FR_OK) LEAVE_FF(*fatfs, res); p = (*fatfs)->win; i = SS(*fatfs); } if (fat == FS_FAT16) { if (LD_WORD(p) == 0) n++; p += 2; i -= 2; } else { if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) n++; p += 4; i -= 4; } } while (--clst); } (*fatfs)->free_clust = n; if (fat == FS_FAT32) (*fatfs)->fsi_flag = 1; *nclst = n; LEAVE_FF(*fatfs, FR_OK); } /*-----------------------------------------------------------------------*/ /* Truncate File */ /*-----------------------------------------------------------------------*/ FRESULT f_truncate ( FIL *fp /* Pointer to the file object */ ) { FRESULT res; DWORD ncl; res = validate(fp->fs, fp->id); /* Check validity of the object */ if (res != FR_OK) LEAVE_FF(fp->fs, res); if (fp->flag & FA__ERROR) /* Check abort flag */ LEAVE_FF(fp->fs, FR_INT_ERR); if (!(fp->flag & FA_WRITE)) /* Check access mode */ LEAVE_FF(fp->fs, FR_DENIED); if (fp->fsize > fp->fptr) { fp->fsize = fp->fptr; /* Set file size to current R/W point */ fp->flag |= FA__WRITTEN; if (fp->fptr == 0) { /* When set file size to zero, remove entire cluster chain */ res = remove_chain(fp->fs, fp->org_clust); fp->org_clust = 0; } else { /* When truncate a part of the file, remove remaining clusters */ ncl = get_fat(fp->fs, fp->curr_clust); res = FR_OK; if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR; if (ncl == 1) res = FR_INT_ERR; if (res == FR_OK && ncl < fp->fs->max_clust) { res = put_fat(fp->fs, fp->curr_clust, 0x0FFFFFFF); if (res == FR_OK) res = remove_chain(fp->fs, ncl); } } } if (res != FR_OK) fp->flag |= FA__ERROR; LEAVE_FF(fp->fs, res); } /*-----------------------------------------------------------------------*/ /* Delete a File or Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_unlink ( const XCHAR *path /* Pointer to the file or directory path */ ) { FRESULT res; DIR dj, sdj; NAMEBUF(sfn, lfn); BYTE *dir; DWORD dclst; res = chk_mounted(&path, &dj.fs, 1); if (res != FR_OK) LEAVE_FF(dj.fs, res); INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT)) res = FR_INVALID_NAME; if (res != FR_OK) LEAVE_FF(dj.fs, res); /* Follow failed */ dir = dj.dir; if (!dir) /* Is it the root directory? */ LEAVE_FF(dj.fs, FR_INVALID_NAME); if (dir[DIR_Attr] & AM_RDO) /* Is it a R/O object? */ LEAVE_FF(dj.fs, FR_DENIED); dclst = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */ if (dclst < 2) LEAVE_FF(dj.fs, FR_INT_ERR); mem_cpy(&sdj, &dj, sizeof(DIR)); /* Check if the sub-dir is empty or not */ sdj.sclust = dclst; res = dir_seek(&sdj, 2); if (res != FR_OK) LEAVE_FF(dj.fs, res); res = dir_read(&sdj); if (res == FR_OK) res = FR_DENIED; /* Not empty sub-dir */ if (res != FR_NO_FILE) LEAVE_FF(dj.fs, res); } res = dir_remove(&dj); /* Remove directory entry */ if (res == FR_OK) { if (dclst) res = remove_chain(dj.fs, dclst); /* Remove the cluster chain */ if (res == FR_OK) res = sync(dj.fs); } LEAVE_FF(dj.fs, res); } /*-----------------------------------------------------------------------*/ /* Create a Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_mkdir ( const XCHAR *path /* Pointer to the directory path */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); BYTE *dir, n; DWORD dsect, dclst, pclst, tim; res = chk_mounted(&path, &dj.fs, 1); if (res != FR_OK) LEAVE_FF(dj.fs, res); INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (res == FR_OK) res = FR_EXIST; /* Any file or directory is already existing */ if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT)) res = FR_INVALID_NAME; if (res != FR_NO_FILE) /* Any error occured */ LEAVE_FF(dj.fs, res); dclst = create_chain(dj.fs, 0); /* Allocate a new cluster for new directory table */ res = FR_OK; if (dclst == 0) res = FR_DENIED; if (dclst == 1) res = FR_INT_ERR; if (dclst == 0xFFFFFFFF) res = FR_DISK_ERR; if (res == FR_OK) res = move_window(dj.fs, 0); if (res != FR_OK) LEAVE_FF(dj.fs, res); dsect = clust2sect(dj.fs, dclst); dir = dj.fs->win; /* Initialize the new directory table */ mem_set(dir, 0, SS(dj.fs)); mem_set(dir+DIR_Name, ' ', 8+3); /* Create "." entry */ dir[DIR_Name] = '.'; dir[DIR_Attr] = AM_DIR; tim = get_fattime(); ST_DWORD(dir+DIR_WrtTime, tim); ST_WORD(dir+DIR_FstClusLO, dclst); ST_WORD(dir+DIR_FstClusHI, dclst >> 16); mem_cpy(dir+32, dir, 32); /* Create ".." entry */ dir[33] = '.'; pclst = dj.sclust; if (dj.fs->fs_type == FS_FAT32 && pclst == dj.fs->dirbase) pclst = 0; ST_WORD(dir+32+DIR_FstClusLO, pclst); ST_WORD(dir+32+DIR_FstClusHI, pclst >> 16); for (n = 0; n < dj.fs->csize; n++) { /* Write dot entries and clear left sectors */ dj.fs->winsect = dsect++; dj.fs->wflag = 1; res = move_window(dj.fs, 0); if (res) LEAVE_FF(dj.fs, res); mem_set(dir, 0, SS(dj.fs)); } res = dir_register(&dj); if (res != FR_OK) { remove_chain(dj.fs, dclst); } else { dir = dj.dir; dir[DIR_Attr] = AM_DIR; /* Attribute */ ST_DWORD(dir+DIR_WrtTime, tim); /* Crated time */ ST_WORD(dir+DIR_FstClusLO, dclst); /* Table start cluster */ ST_WORD(dir+DIR_FstClusHI, dclst >> 16); dj.fs->wflag = 1; res = sync(dj.fs); } LEAVE_FF(dj.fs, res); } /*-----------------------------------------------------------------------*/ /* Change File Attribute */ /*-----------------------------------------------------------------------*/ FRESULT f_chmod ( const XCHAR *path, /* Pointer to the file path */ BYTE value, /* Attribute bits */ BYTE mask /* Attribute mask to change */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); BYTE *dir; res = chk_mounted(&path, &dj.fs, 1); if (res == FR_OK) { INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT)) res = FR_INVALID_NAME; if (res == FR_OK) { dir = dj.dir; if (!dir) { /* Is it a root directory? */ res = FR_INVALID_NAME; } else { /* File or sub directory */ mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC; /* Valid attribute mask */ dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */ dj.fs->wflag = 1; res = sync(dj.fs); } } } LEAVE_FF(dj.fs, res); } /*-----------------------------------------------------------------------*/ /* Change Timestamp */ /*-----------------------------------------------------------------------*/ FRESULT f_utime ( const XCHAR *path, /* Pointer to the file/directory name */ const FILINFO *fno /* Pointer to the timestamp to be set */ ) { FRESULT res; DIR dj; NAMEBUF(sfn, lfn); BYTE *dir; res = chk_mounted(&path, &dj.fs, 1); if (res == FR_OK) { INITBUF(dj, sfn, lfn); res = follow_path(&dj, path); /* Follow the file path */ if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT)) res = FR_INVALID_NAME; if (res == FR_OK) { dir = dj.dir; if (!dir) { /* Root directory */ res = FR_INVALID_NAME; } else { /* File or sub-directory */ ST_WORD(dir+DIR_WrtTime, fno->ftime); ST_WORD(dir+DIR_WrtDate, fno->fdate); dj.fs->wflag = 1; res = sync(dj.fs); } } } LEAVE_FF(dj.fs, res); } /*-----------------------------------------------------------------------*/ /* Rename File/Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_rename ( const XCHAR *path_old, /* Pointer to the old name */ const XCHAR *path_new /* Pointer to the new name */ ) { FRESULT res;


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