/*--------------------------------------------------------------------------/ / FatFs - Tiny FAT file system module R0.04b (C)ChaN, 2007 /---------------------------------------------------------------------------/ / The FatFs module is an experimenal project to implement FAT file system to / cheap microcontrollers. This is a free software and is opened for education, / research and development under license policy of following trems. / / Copyright (C) 2007, ChaN, all right reserved. / / * The FatFs module is a free software and there is no warranty. / * You can use, modify and/or redistribute it for personal, non-profit or / profit use without any restriction under your responsibility. / * Redistributions of source code must retain the above copyright notice. / /---------------------------------------------------------------------------/ / Feb 26, 2006 R0.00 Prototype. / Apr 29, 2006 R0.01 First stable version. / Jun 01, 2006 R0.02 Added FAT12 support. / Removed unbuffered mode. / Fixed a problem on small (<32M) patition. / Jun 10, 2006 R0.02a Added a configuration option (_FS_MINIMUM). / Sep 22, 2006 R0.03 Added f_rename(). / Changed option _FS_MINIMUM to _FS_MINIMIZE. / Dec 09, 2006 R0.03a Improved cluster scan algolithm to write files fast. / Feb 04, 2007 R0.04 Added FAT32 supprt. / Changed some interfaces incidental to FatFs. / Changed f_mountdrv() to f_mount(). / Apr 01, 2007 R0.04a Added a capability of extending file size to f_lseek(). / Added minimization level 3. / Fixed a problem in FAT32 support. / May 05, 2007 R0.04b Added a configuration option _USE_NTFLAG. / Added FSInfo support. / Fixed some problems corresponds to FAT32 support. / Fixed DBCS name can result FR_INVALID_NAME. / Fixed short seek (<= csize) collapses the file object. /---------------------------------------------------------------------------*/ #include #include "tff.h" /* Tiny-FatFs declarations */ #include "diskio.h" /* Include file for user provided disk functions */ typedef enum { FALSE = 0, TRUE } BOOL; static FATFS *FatFs; /* Pointer to the file system objects (logical drive) */ static WORD fsid; /* File system mount ID */ /*------------------------------------------------------------------------- Module Private Functions -------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------*/ /* Change window offset */ /*-----------------------------------------------------------------------*/ static BOOL move_window ( /* TRUE: successful, FALSE: failed */ DWORD sector /* Sector number to make apperance in the FatFs->win */ ) /* Move to zero only writes back dirty window */ { DWORD wsect; FATFS *fs = FatFs; wsect = fs->winsect; if (wsect != sector) { /* Changed current window */ #if !_FS_READONLY BYTE n; if (fs->winflag) { /* Write back dirty window if needed */ if (disk_write(0, fs->win, wsect, 1) != RES_OK) return FALSE; fs->winflag = 0; if (wsect < (fs->fatbase + fs->sects_fat)) { /* In FAT area */ for (n = fs->n_fats; n >= 2; n--) { /* Refrect the change to all FAT copies */ wsect += fs->sects_fat; disk_write(0, fs->win, wsect, 1); } } } #endif if (sector) { if (disk_read(0, fs->win, sector, 1) != RES_OK) return FALSE; fs->winsect = sector; } } return TRUE; } /*-----------------------------------------------------------------------*/ /* Clean-up cached data */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static FRESULT sync (void) /* FR_OK: successful, FR_RW_ERROR: failed */ { FATFS *fs = FatFs; fs->winflag = 1; if (!move_window(0)) return FR_RW_ERROR; #if _USE_FSINFO if (fs->fs_type == FS_FAT32 && fs->fsi_flag) { /* Update FSInfo sector if needed */ fs->winsect = 0; memset(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(0, fs->win, fs->fsi_sector, 1); fs->fsi_flag = 0; } #endif if (disk_ioctl(0, CTRL_SYNC, NULL) != RES_OK) return FR_RW_ERROR; return FR_OK; } #endif /*-----------------------------------------------------------------------*/ /* Get a cluster status */ /*-----------------------------------------------------------------------*/ static CLUST get_cluster ( /* 0,>=2: successful, 1: failed */ CLUST clust /* Cluster# to get the link information */ ) { WORD wc, bc; DWORD fatsect; FATFS *fs = FatFs; if (clust >= 2 && clust < fs->max_clust) { /* Valid cluster# */ fatsect = fs->fatbase; switch (fs->fs_type) { case FS_FAT12 : bc = (WORD)clust * 3 / 2; if (!move_window(fatsect + bc / 512)) break; wc = fs->win[bc % 512]; bc++; if (!move_window(fatsect + bc / 512)) break; wc |= (WORD)fs->win[bc % 512] << 8; return (clust & 1) ? (wc >> 4) : (wc & 0xFFF); case FS_FAT16 : if (!move_window(fatsect + clust / 256)) break; return LD_WORD(&fs->win[((WORD)clust * 2) % 512]); #if _FAT32 case FS_FAT32 : if (!move_window(fatsect + clust / 128)) break; return LD_DWORD(&fs->win[((WORD)clust * 4) % 512]) & 0x0FFFFFFF; #endif } } return 1; /* There is no cluster information, or an error occured */ } /*-----------------------------------------------------------------------*/ /* Change a cluster status */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static BOOL put_cluster ( /* TRUE: successful, FALSE: failed */ CLUST clust, /* Cluster# to change */ CLUST val /* New value to mark the cluster */ ) { WORD bc; BYTE *p; DWORD fatsect; FATFS *fs = FatFs; fatsect = fs->fatbase; switch (fs->fs_type) { case FS_FAT12 : bc = (WORD)clust * 3 / 2; if (!move_window(fatsect + bc / 512)) return FALSE; p = &fs->win[bc % 512]; *p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val; bc++; fs->winflag = 1; if (!move_window(fatsect + bc / 512)) return FALSE; p = &fs->win[bc % 512]; *p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F)); break; case FS_FAT16 : if (!move_window(fatsect + clust / 256)) return FALSE; ST_WORD(&fs->win[((WORD)clust * 2) % 512], (WORD)val); break; #if _FAT32 case FS_FAT32 : if (!move_window(fatsect + clust / 128)) return FALSE; ST_DWORD(&fs->win[((WORD)clust * 4) % 512], val); break; #endif default : return FALSE; } fs->winflag = 1; return TRUE; } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Remove a cluster chain */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static BOOL remove_chain ( /* TRUE: successful, FALSE: failed */ CLUST clust /* Cluster# to remove chain from */ ) { CLUST nxt; FATFS *fs = FatFs; while (clust >= 2 && clust < fs->max_clust) { nxt = get_cluster(clust); if (nxt == 1) return FALSE; if (!put_cluster(clust, 0)) return FALSE; if (fs->free_clust != (CLUST)0xFFFFFFFF) { fs->free_clust++; #if _USE_FSINFO fs->fsi_flag = 1; #endif } clust = nxt; } return TRUE; } #endif /*-----------------------------------------------------------------------*/ /* Stretch or create a cluster chain */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static CLUST create_chain ( /* 0: no free cluster, 1: error, >=2: new cluster number */ CLUST clust /* Cluster# to stretch, 0 means create new */ ) { CLUST cstat, ncl, scl, mcl; FATFS *fs = FatFs; mcl = fs->max_clust; if (clust == 0) { /* Create new chain */ scl = fs->last_clust; /* Get last allocated cluster */ if (scl < 2 || scl >= mcl) scl = 1; } else { /* Stretch existing chain */ cstat = get_cluster(clust); /* Check the cluster status */ if (cstat < 2) return 1; /* It is an invalid cluster */ if (cstat < mcl) return cstat; /* It is already followed by next cluster */ scl = clust; } ncl = scl; /* Start cluster */ for (;;) { ncl++; /* Next cluster */ if (ncl >= mcl) { /* Wrap around */ ncl = 2; if (ncl > scl) return 0; /* No free custer */ } cstat = get_cluster(ncl); /* Get the cluster status */ if (cstat == 0) break; /* Found a free cluster */ if (cstat == 1) return 1; /* Any error occured */ if (ncl == scl) return 0; /* No free custer */ } if (!put_cluster(ncl, (CLUST)0x0FFFFFFF)) return 1; /* Mark the new cluster "in use" */ if (clust && !put_cluster(clust, ncl)) return 1; /* Link it to previous one if needed */ fs->last_clust = ncl; /* Update fsinfo */ if (fs->free_clust != (CLUST)0xFFFFFFFF) { fs->free_clust--; #if _USE_FSINFO fs->fsi_flag = 1; #endif } return ncl; /* Return new cluster number */ } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Get sector# from cluster# */ /*-----------------------------------------------------------------------*/ static DWORD clust2sect ( /* !=0: sector number, 0: failed - invalid cluster# */ CLUST clust /* Cluster# to be converted */ ) { FATFS *fs = FatFs; clust -= 2; if (clust >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */ return (DWORD)clust * fs->sects_clust + fs->database; } /*-----------------------------------------------------------------------*/ /* Move directory pointer to next */ /*-----------------------------------------------------------------------*/ static BOOL next_dir_entry ( /* TRUE: successful, FALSE: could not move next */ DIRECTORY *dirobj /* Pointer to directory object */ ) { CLUST clust; WORD idx; FATFS *fs = FatFs; idx = dirobj->index + 1; if ((idx & 15) == 0) { /* Table sector changed? */ dirobj->sect++; /* Next sector */ if (!dirobj->clust) { /* In static table */ if (idx >= fs->n_rootdir) return FALSE; /* Reached to end of table */ } else { /* In dynamic table */ if (((idx / 16) & (fs->sects_clust - 1)) == 0) { /* Cluster changed? */ clust = get_cluster(dirobj->clust); /* Get next cluster */ if (clust < 2 || clust >= fs->max_clust) /* Reached to end of table */ return FALSE; dirobj->clust = clust; /* Initialize for new cluster */ dirobj->sect = clust2sect(clust); } } } dirobj->index = idx; /* Lower 4 bit of dirobj->index indicates offset in dirobj->sect */ return TRUE; } /*-----------------------------------------------------------------------*/ /* Get file status from directory entry */ /*-----------------------------------------------------------------------*/ #if _FS_MINIMIZE <= 1 static void get_fileinfo ( /* No return code */ FILINFO *finfo, /* Ptr to store the File Information */ const BYTE *dir /* Ptr to the directory entry */ ) { BYTE n, c, a; char *p; p = &finfo->fname[0]; a = _USE_NTFLAG ? dir[DIR_NTres] : 0; /* NT flag */ for (n = 0; n < 8; n++) { /* Convert file name (body) */ c = dir[n]; if (c == ' ') break; if (c == 0x05) c = 0xE5; if (a & 0x08 && c >= 'A' && c <= 'Z') c += 0x20; *p++ = c; } if (dir[8] != ' ') { /* Convert file name (extension) */ *p++ = '.'; for (n = 8; n < 11; n++) { c = dir[n]; if (c == ' ') break; if (a & 0x10 && c >= 'A' && c <= 'Z') c += 0x20; *p++ = c; } } *p = '\0'; finfo->fattrib = dir[DIR_Attr]; /* Attribute */ finfo->fsize = LD_DWORD(&dir[DIR_FileSize]); /* Size */ finfo->fdate = LD_WORD(&dir[DIR_WrtDate]); /* Date */ finfo->ftime = LD_WORD(&dir[DIR_WrtTime]); /* Time */ } #endif /* _FS_MINIMIZE <= 1 */ /*-----------------------------------------------------------------------*/ /* Pick a paragraph and create the name in format of directory entry */ /*-----------------------------------------------------------------------*/ static char make_dirfile ( /* 1: error - detected an invalid format, '\0'or'/': next character */ const char **path, /* Pointer to the file path pointer */ char *dirname /* Pointer to directory name buffer {Name(8), Ext(3), NT flag(1)} */ ) { BYTE n, t, c, a, b; memset(dirname, ' ', 8+3); /* Fill buffer with spaces */ a = 0; b = 0x18; /* NT flag */ n = 0; t = 8; for (;;) { c = *(*path)++; if (c == '\0' || c == '/') { /* Reached to end of str or directory separator */ if (n == 0) break; dirname[11] = _USE_NTFLAG ? (a & b) : 0; return c; } if (c <= ' ' || c == 0x7F) break; /* Reject invisible chars */ if (c == '.') { if (!(a & 1) && n >= 1 && n <= 8) { /* Enter extension part */ n = 8; t = 11; continue; } break; } if (_USE_SJIS && ((c >= 0x81 && c <= 0x9F) || /* Accept S-JIS code */ (c >= 0xE0 && c <= 0xFC))) { if (n == 0 && c == 0xE5) /* Change heading \xE5 to \x05 */ c = 0x05; a ^= 1; goto md_l2; } if (c == '"') break; /* Reject " */ if (c <= ')') goto md_l1; /* Accept ! # $ % & ' ( ) */ if (c <= ',') break; /* Reject * + , */ if (c <= '9') goto md_l1; /* Accept - 0-9 */ if (c <= '?') break; /* Reject : ; < = > ? */ if (!(a & 1)) { /* These checks are not applied to S-JIS 2nd byte */ if (c == '|') break; /* Reject | */ if (c >= '[' && c <= ']') break;/* Reject [ \ ] */ if (_USE_NTFLAG && c >= 'A' && c <= 'Z') (t == 8) ? (b &= ~0x08) : (b &= ~0x10); if (c >= 'a' && c <= 'z') { /* Convert to upper case */ c -= 0x20; if (_USE_NTFLAG) (t == 8) ? (a |= 0x08) : (a |= 0x10); } } md_l1: a &= ~1; md_l2: if (n >= t) break; dirname[n++] = c; } return 1; } /*-----------------------------------------------------------------------*/ /* Trace a file path */ /*-----------------------------------------------------------------------*/ static FRESULT trace_path ( /* FR_OK(0): successful, !=0: error code */ DIRECTORY *dirobj, /* Pointer to directory object to return last directory */ char *fn, /* Pointer to last segment name to return */ const char *path, /* Full-path string to trace a file or directory */ BYTE **dir /* Directory pointer in Win[] to retutn */ ) { CLUST clust; char ds; BYTE *dptr = NULL; FATFS *fs = FatFs; /* Initialize directory object */ clust = fs->dirbase; #if _FAT32 if (fs->fs_type == FS_FAT32) { dirobj->clust = dirobj->sclust = clust; dirobj->sect = clust2sect(clust); } else #endif { dirobj->clust = dirobj->sclust = 0; dirobj->sect = clust; } dirobj->index = 0; dirobj->fs = fs; if (*path == '\0') { /* Null path means the root directory */ *dir = NULL; return FR_OK; } for (;;) { ds = make_dirfile(&path, fn); /* Get a paragraph into fn[] */ if (ds == 1) return FR_INVALID_NAME; for (;;) { if (!move_window(dirobj->sect)) return FR_RW_ERROR; dptr = &fs->win[(dirobj->index & 15) * 32]; /* Pointer to the directory entry */ if (dptr[DIR_Name] == 0) /* Has it reached to end of dir? */ return !ds ? FR_NO_FILE : FR_NO_PATH; if (dptr[DIR_Name] != 0xE5 /* Matched? */ && !(dptr[DIR_Attr] & AM_VOL) && !memcmp(&dptr[DIR_Name], fn, 8+3) ) break; if (!next_dir_entry(dirobj)) /* Next directory pointer */ return !ds ? FR_NO_FILE : FR_NO_PATH; } if (!ds) { *dir = dptr; return FR_OK; } /* Matched with end of path */ if (!(dptr[DIR_Attr] & AM_DIR)) return FR_NO_PATH; /* Cannot trace because it is a file */ clust = /* Get cluster# of the directory */ #if _FAT32 ((DWORD)LD_WORD(&dptr[DIR_FstClusHI]) << 16) | #endif LD_WORD(&dptr[DIR_FstClusLO]); dirobj->clust = dirobj->sclust = clust; /* Restart scannig with the new directory */ dirobj->sect = clust2sect(clust); dirobj->index = 2; } } /*-----------------------------------------------------------------------*/ /* Reserve a directory entry */ /*-----------------------------------------------------------------------*/ #if !_FS_READONLY static FRESULT reserve_direntry ( /* FR_OK: successful, FR_DENIED: no free entry, FR_RW_ERROR: a disk error occured */ DIRECTORY *dirobj, /* Target directory to create new entry */ BYTE **dir /* Pointer to pointer to created entry to retutn */ ) { CLUST clust; DWORD sector; BYTE c, n, *dptr; FATFS *fs = FatFs; /* Re-initialize directory object */ clust = dirobj->sclust; if (clust) { /* Dyanmic directory table */ dirobj->clust = clust; dirobj->sect = clust2sect(clust); } else { /* Static directory table */ dirobj->sect = fs->dirbase; } dirobj->index = 0; do { if (!move_window(dirobj->sect)) return FR_RW_ERROR; dptr = &fs->win[(dirobj->index & 15) * 32]; /* Pointer to the directory entry */ c = dptr[DIR_Name]; if (c == 0 || c == 0xE5) { /* Found an empty entry! */ *dir = dptr; return FR_OK; } } while (next_dir_entry(dirobj)); /* Next directory pointer */ /* Reached to end of the directory table */ /* Abort when static table or could not stretch dynamic table */ if (!clust || !(clust = create_chain(dirobj->clust))) return FR_DENIED; if (clust == 1 || !move_window(0)) return FR_RW_ERROR; fs->winsect = sector = clust2sect(clust); /* Cleanup the expanded table */ memset(fs->win, 0, 512); for (n = fs->sects_clust; n; n--) { if (disk_write(0, fs->win, sector, 1) != RES_OK) return FR_RW_ERROR; sector++; } fs->winflag = 1; *dir = fs->win; return FR_OK; } #endif /* !_FS_READONLY */ /*-----------------------------------------------------------------------*/ /* Load boot record and check if it is a 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 or error */ DWORD sect /* Sector# to check if it is a FAT boot record or not */ ) { FATFS *fs = FatFs; if (disk_read(0, fs->win, sect, 1) != RES_OK) /* Load boot record */ return 2; if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature */ return 2; if (!memcmp(&fs->win[BS_FilSysType], "FAT", 3)) /* Check FAT signature */ return 0; #if _FAT32 if (!memcmp(&fs->win[BS_FilSysType32], "FAT32", 5) && !(fs->win[BPB_ExtFlags] & 0x80)) return 0; #endif return 1; } /*-----------------------------------------------------------------------*/ /* Make sure that the file system is valid */ /*-----------------------------------------------------------------------*/ static FRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */ const char **path, /* Pointer to pointer to the path name (drive number) */ BYTE chk_wp /* !=0: Check media write protection for wrinting fuctions */ ) { BYTE fmt; DSTATUS stat; DWORD bootsect, fatsize, totalsect, maxclust; const char *p = *path; FATFS *fs = FatFs; while (*p == ' ') p++; /* Strip leading spaces */ if (*p == '/') p++; /* Strip heading slash */ *path = p; /* Return pointer to the path name */ /* Is the file system object registered? */ if (!fs) return FR_NOT_ENABLED; /* Chekck if the logical drive has been mounted or not */ if (fs->fs_type) { stat = disk_status(0); if (!(stat & STA_NOINIT)) { /* If the physical drive is kept initialized */ #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 has not been mounted, following code attempts to mount the logical drive */ memset(fs, 0, sizeof(FATFS)); /* Clean-up the file system object */ stat = disk_initialize(0); /* Initialize low level disk I/O layer */ if (stat & STA_NOINIT) /* Check if the drive is ready */ return FR_NOT_READY; #if !_FS_READONLY if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */ return FR_WRITE_PROTECTED; #endif /* Search FAT partition on the drive */ fmt = check_fs(bootsect = 0); /* Check sector 0 as an SFD format */ if (fmt == 1) { /* Not a FAT boot record, it may be patitioned */ /* Check a partition listed in top of the partition table */ if (fs->win[MBR_Table+4]) { /* Is the 1st partition existing? */ bootsect = LD_DWORD(&fs->win[MBR_Table+8]); /* Partition offset in LBA */ fmt = check_fs(bootsect); /* Check the partition */ } } if (fmt || LD_WORD(&fs->win[BPB_BytsPerSec]) != 512) /* No valid FAT patition is found */ return FR_NO_FILESYSTEM; /* Initialize the file system object */ fatsize = LD_WORD(&fs->win[BPB_FATSz16]); /* Number of sectors per FAT */ if (!fatsize) fatsize = LD_DWORD(&fs->win[BPB_FATSz32]); fs->sects_fat = (CLUST)fatsize; fs->n_fats = fs->win[BPB_NumFATs]; /* Number of FAT copies */ fatsize *= fs->n_fats; /* (Number of sectors in FAT area) */ fs->fatbase = bootsect + LD_WORD(&fs->win[BPB_RsvdSecCnt]); /* FAT start sector (lba) */ fs->sects_clust = fs->win[BPB_SecPerClus]; /* Number of sectors per cluster */ fs->n_rootdir = LD_WORD(&fs->win[BPB_RootEntCnt]); /* Nmuber of root directory entries */ totalsect = LD_WORD(&fs->win[BPB_TotSec16]); /* Number of sectors on the file system */ if (!totalsect) totalsect = LD_DWORD(&fs->win[BPB_TotSec32]); fs->max_clust = maxclust = (totalsect /* Last cluster# + 1 */ - LD_WORD(&fs->win[BPB_RsvdSecCnt]) - fatsize - fs->n_rootdir / 16 ) / fs->sects_clust + 2; fmt = FS_FAT12; /* Determine the FAT sub type */ if (maxclust > 0xFF7) fmt = FS_FAT16; if (maxclust > 0xFFF7) #if !_FAT32 return FR_NO_FILESYSTEM; #else fmt = FS_FAT32; if (fmt == FS_FAT32) fs->dirbase = LD_DWORD(&fs->win[BPB_RootClus]); /* Root directory start cluster */ else #endif fs->dirbase = fs->fatbase + fatsize; /* Root directory start sector (lba) */ fs->database = fs->fatbase + fatsize + fs->n_rootdir / 16; /* Data start sector (lba) */ fs->fs_type = fmt; /* FAT sub-type */ #if !_FS_READONLY fs->free_clust = (CLUST)0xFFFFFFFF; #if _USE_FSINFO /* Load fsinfo sector if needed */ if (fmt == FS_FAT32) { fs->fsi_sector = bootsect + LD_WORD(&fs->win[BPB_FSInfo]); if (disk_read(0, 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 #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 id is valid, !=0: Not valid */ const FATFS *fs, /* Pointer to the file system object */ WORD id /* id member of the target object to be checked */ ) { if (!fs || fs->id != id) return FR_INVALID_OBJECT; if (disk_status(0) & STA_NOINIT) return FR_NOT_READY; return FR_OK; } /*-------------------------------------------------------------------------- Public Functions --------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------*/ /* Mount/Unmount a Locical Drive */ /*-----------------------------------------------------------------------*/ FRESULT f_mount ( BYTE drv, /* Logical drive number to be mounted/unmounted */ FATFS *fs /* Pointer to new file system object (NULL for unmount)*/ ) { FATFS *fsobj; if (drv) return FR_INVALID_DRIVE; fsobj = FatFs; FatFs = fs; if (fsobj) memset(fsobj, 0, sizeof(FATFS)); if (fs) memset(fs, 0, sizeof(FATFS)); return FR_OK; } /*-----------------------------------------------------------------------*/ /* Open or Create a File */ /*-----------------------------------------------------------------------*/ FRESULT f_open ( FIL *fp, /* Pointer to the blank file object */ const char *path, /* Pointer to the file name */ BYTE mode /* Access mode and file open mode flags */ ) { FRESULT res; BYTE *dir; DIRECTORY dirobj; char fn[8+3+1]; FATFS *fs = FatFs; fp->fs = NULL; #if !_FS_READONLY mode &= (FA_READ|FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW); res = auto_mount(&path, (BYTE)(mode & (FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW))); #else mode &= FA_READ; res = auto_mount(&path, 0); #endif if (res != FR_OK) return res; /* Trace the file path */ res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */ #if !_FS_READONLY /* Create or Open a File */ if (mode & (FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW)) { CLUST rs; DWORD dw; if (res != FR_OK) { /* No file, create new */ if (res != FR_NO_FILE) return res; res = reserve_direntry(&dirobj, &dir); if (res != FR_OK) return res; memset(dir, 0, 32); /* Initialize the new entry */ memcpy(&dir[DIR_Name], fn, 8+3); dir[DIR_NTres] = fn[11]; mode |= FA_CREATE_ALWAYS; } else { /* Any object is already existing */ if (mode & FA_CREATE_NEW) /* Cannot create new */ return FR_EXIST; if (dir == NULL || (dir[DIR_Attr] & (AM_RDO|AM_DIR))) /* Cannot overwrite (R/O or DIR) */ return FR_DENIED; if (mode & FA_CREATE_ALWAYS) { /* Resize it to zero */ #if _FAT32 rs = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]); ST_WORD(&dir[DIR_FstClusHI], 0); #else rs = LD_WORD(&dir[DIR_FstClusLO]); #endif ST_WORD(&dir[DIR_FstClusLO], 0); /* cluster = 0 */ ST_DWORD(&dir[DIR_FileSize], 0); /* size = 0 */ fs->winflag = 1; dw = fs->winsect; /* Remove the cluster chain */ if (!remove_chain(rs) || !move_window(dw)) return FR_RW_ERROR; fs->last_clust = rs - 1; /* Reuse the cluster hole */ } } if (mode & FA_CREATE_ALWAYS) { dir[DIR_Attr] = AM_ARC; /* New attribute */ dw = get_fattime(); ST_DWORD(&dir[DIR_WrtTime], dw); /* Updated time */ ST_DWORD(&dir[DIR_CrtTime], dw); /* Created time */ fs->winflag = 1; } } /* Open a File */ else { #endif /* !_FS_READONLY */ if (res != FR_OK) return res; /* Trace failed */ if (dir == NULL || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */ return FR_NO_FILE; #if !_FS_READONLY if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */ return FR_DENIED; } fp->dir_sect = fs->winsect; /* Pointer to the directory entry */ fp->dir_ptr = dir; #endif fp->flag = mode; /* File access mode */ fp->org_clust = /* File start cluster */ #if _FAT32 ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | #endif LD_WORD(&dir[DIR_FstClusLO]); fp->fsize = LD_DWORD(&dir[DIR_FileSize]); /* File size */ fp->fptr = 0; /* File ptr */ fp->sect_clust = 1; /* Sector counter */ fp->fs = fs; fp->id = fs->id; /* Owner file system object of the file */ return FR_OK; } /*-----------------------------------------------------------------------*/ /* Read File */ /*-----------------------------------------------------------------------*/ FRESULT f_read ( FIL *fp, /* Pointer to the file object */ BYTE *buff, /* Pointer to data buffer */ WORD btr, /* Number of bytes to read */ WORD *br /* Pointer to number of bytes read */ ) { DWORD sect, remain; WORD rcnt; CLUST clust; BYTE cc, *rbuff = buff; FRESULT res; FATFS *fs = fp->fs; *br = 0; res = validate(fs, fp->id); /* Check validity of the object */ if (res) return res; if (fp->flag & FA__ERROR) return FR_RW_ERROR; /* Check error flag */ if (!(fp->flag & FA_READ)) return FR_DENIED; /* Check access mode */ remain = fp->fsize - fp->fptr; if (btr > remain) btr = (WORD)remain; /* Truncate read count by number of bytes left */ for ( ; btr; /* Repeat until all data transferred */ rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) { if ((fp->fptr % 512) == 0) { /* On the sector boundary */ if (--fp->sect_clust) { /* Decrement left sector counter */ sect = fp->curr_sect + 1; /* Get current sector */ } else { /* On the cluster boundary, get next cluster */ clust = (fp->fptr == 0) ? fp->org_clust : get_cluster(fp->curr_clust); if (clust < 2 || clust >= fs->max_clust) goto fr_error; fp->curr_clust = clust; /* Current cluster */ sect = clust2sect(clust); /* Get current sector */ fp->sect_clust = fs->sects_clust; /* Re-initialize the left sector counter */ } fp->curr_sect = sect; /* Update current sector */ cc = btr / 512; /* When left bytes >= 512, */ if (cc) { /* Read maximum contiguous sectors directly */ if (cc > fp->sect_clust) cc = fp->sect_clust; if (disk_read(0, rbuff, sect, cc) != RES_OK) goto fr_error; fp->sect_clust -= cc - 1; fp->curr_sect += cc - 1; rcnt = cc * 512; continue; } } if (!move_window(fp->curr_sect)) goto fr_error; /* Move sector window */ rcnt = 512 - (WORD)(fp->fptr % 512); /* Copy fractional bytes from sector window */ if (rcnt > btr) rcnt = btr; memcpy(rbuff, &fs->win[(WORD)fp->fptr % 512], rcnt); } return FR_OK; fr_error: /* Abort this function due to an unrecoverable error */ fp->flag |= FA__ERROR; return FR_RW_ERROR; } #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 */ WORD btw, /* Number of bytes to write */ WORD *bw /* Pointer to number of bytes written */ ) { DWORD sect; WORD wcnt; CLUST clust; BYTE cc; FRESULT res; const BYTE *wbuff = (BYTE*)buff; FATFS *fs = fp->fs; *bw = 0; res = validate(fs, fp->id); /* Check validity of the object */ if (res) return res; if (fp->flag & FA__ERROR) return FR_RW_ERROR; /* Check error flag */ if (!(fp->flag & FA_WRITE)) return FR_DENIED; /* Check access mode */ if (fp->fsize + btw < fp->fsize) return FR_OK; /* File size cannot reach 4GB */ for ( ; btw; /* Repeat until all data transferred */ wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) { if ((fp->fptr % 512) == 0) { /* On the sector boundary */ if (--(fp->sect_clust)) { /* Decrement left sector counter */ sect = fp->curr_sect + 1; /* Get current sector */ } else { /* On the cluster boundary, get next cluster */ if (fp->fptr == 0) { /* Is top of the file */ clust = fp->org_clust; if (clust == 0) /* No cluster is created yet */ fp->org_clust = clust = create_chain(0); /* Create a new cluster chain */ } else { /* Middle or end of file */ clust = create_chain(fp->curr_clust); /* Trace or streach cluster chain */ } if (clust == 0) break; /* Disk full */ if (clust == 1 || clust >= fs->max_clust) goto fw_error; fp->curr_clust = clust; /* Current cluster */ sect = clust2sect(clust); /* Get current sector */ fp->sect_clust = fs->sects_clust; /* Re-initialize the left sector counter */ } fp->curr_sect = sect; /* Update current sector */ cc = btw / 512; /* When left bytes >= 512, */ if (cc) { /* Write maximum contiguous sectors directly */ if (cc > fp->sect_clust) cc = fp->sect_clust; if (disk_write(0, wbuff, sect, cc) != RES_OK) goto fw_error; fp->sect_clust -= cc - 1; fp->curr_sect += cc - 1; wcnt = cc * 512; continue; } if (fp->fptr >= fp->fsize) { /* Flush R/W window if needed */ if (!move_window(0)) goto fw_error; fs->winsect = fp->curr_sect; } } if (!move_window(fp->curr_sect)) /* Move sector window */ goto fw_error; wcnt = 512 - (WORD)(fp->fptr % 512); /* Copy fractional bytes bytes to sector window */ if (wcnt > btw) wcnt = btw; memcpy(&fs->win[(WORD)fp->fptr % 512], wbuff, wcnt); fs->winflag = 1; } if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */ fp->flag |= FA__WRITTEN; /* Set file changed flag */ return FR_OK; fw_error: /* Abort this function due to an unrecoverable error */ fp->flag |= FA__ERROR; return FR_RW_ERROR; } /*-----------------------------------------------------------------------*/ /* Synchronize between File and Disk */ /*-----------------------------------------------------------------------*/ FRESULT f_sync ( FIL *fp /* Pointer to the file object */ ) { DWORD tim; BYTE *dir; FRESULT res; FATFS *fs = fp->fs; res = validate(fs, fp->id); /* Check validity of the object */ if (res == FR_OK) { if (fp->flag & FA__WRITTEN) { /* Has the file been written? */ /* Update the directory entry */ if (!move_window(fp->dir_sect)) return FR_RW_ERROR; 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 */ #if _FAT32 ST_WORD(&dir[DIR_FstClusHI], fp->org_clust >> 16); #endif tim = get_fattime(); /* Updated time */ ST_DWORD(&dir[DIR_WrtTime], tim); fp->flag &= ~FA__WRITTEN; res = sync(); } } return 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 = f_sync(fp); #else res = validate(fp->fs, fp->id); #endif if (res == FR_OK) fp->fs = NULL; return res; } #if _FS_MINIMIZE <= 2 /*-----------------------------------------------------------------------*/ /* Seek File Pointer */ /*-----------------------------------------------------------------------*/ FRESULT f_lseek ( FIL *fp, /* Pointer to the file object */ DWORD ofs /* File pointer from top of file */ ) { CLUST clust; DWORD csize; BYTE csect; FRESULT res; FATFS *fs = fp->fs; res = validate(fs, fp->id); /* Check validity of the object */ if (res) return res; if (fp->flag & FA__ERROR) return FR_RW_ERROR; #if !_FS_READONLY if (ofs > fp->fsize && !(fp->flag & FA_WRITE)) #else if (ofs > fp->fsize) #endif ofs = fp->fsize; fp->fptr = 0; fp->sect_clust = 1; /* Set file R/W pointer to top of the file */ /* Move file R/W pointer if needed */ if (ofs) { clust = fp->org_clust; /* Get start cluster */ #if !_FS_READONLY if (!clust) { /* If the file does not have a cluster chain, create new cluster chain */ clust = create_chain(0); if (clust == 1) goto fk_error; fp->org_clust = clust; } #endif if (clust) { /* If the file has a cluster chain, it can be followed */ csize = (DWORD)fs->sects_clust * 512; /* Cluster size in unit of byte */ for (;;) { /* Loop to skip leading clusters */ fp->curr_clust = clust; /* Update current cluster */ if (ofs <= csize) break; #if !_FS_READONLY if (fp->flag & FA_WRITE) /* Check if in write mode or not */ clust = create_chain(clust); /* Force streached if in write mode */ else #endif clust = get_cluster(clust); /* Only follow cluster chain if not in write mode */ if (clust == 0) { /* Stop if could not follow the cluster chain */ ofs = csize; break; } if (clust == 1 || clust >= fs->max_clust) goto fk_error; fp->fptr += csize; /* Update R/W pointer */ ofs -= csize; } csect = (BYTE)((ofs - 1) / 512); /* Sector offset in the cluster */ fp->curr_sect = clust2sect(clust) + csect; /* Current sector */ fp->sect_clust = fs->sects_clust - csect; /* Left sector counter in the cluster */ fp->fptr += ofs; /* Update file R/W pointer */ } } #if !_FS_READONLY if ((fp->flag & FA_WRITE) && fp->fptr > fp->fsize) { /* Set updated flag if in write mode */ fp->fsize = fp->fptr; fp->flag |= FA__WRITTEN; } #endif return FR_OK; fk_error: /* Abort this function due to an unrecoverable error */ fp->flag |= FA__ERROR; return FR_RW_ERROR; } #if _FS_MINIMIZE <= 1 /*-----------------------------------------------------------------------*/ /* Open a directroy */ /*-----------------------------------------------------------------------*/ FRESULT f_opendir ( DIRECTORY *dirobj, /* Pointer to directory object to create */ const char *path /* Pointer to the directory path */ ) { BYTE *dir; char fn[8+3+1]; FRESULT res; FATFS *fs = FatFs; res = auto_mount(&path, 0); if (res != FR_OK) return res; res = trace_path(dirobj, fn, path, &dir); /* Trace the directory path */ if (res == FR_OK) { /* Trace completed */ if (dir != NULL) { /* It is not the root dir */ if (dir[DIR_Attr] & AM_DIR) { /* The entry is a directory */ dirobj->clust = #if _FAT32 ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | #endif LD_WORD(&dir[DIR_FstClusLO]); dirobj->sect = clust2sect(dirobj->clust); dirobj->index = 2; } else { /* The entry is not a directory */ res = FR_NO_FILE; } } dirobj->id = fs->id; } return res; } /*-----------------------------------------------------------------------*/ /* Read Directory Entry in Sequense */ /*-----------------------------------------------------------------------*/ FRESULT f_readdir ( DIRECTORY *dirobj, /* Pointer to the directory object */ FILINFO *finfo /* Pointer to file information to return */ ) { BYTE *dir, c; FRESULT res; FATFS *fs = dirobj->fs; res = validate(fs, dirobj->id); /* Check validity of the object */ if (res) return res; finfo->fname[0] = 0; while (dirobj->sect) { if (!move_window(dirobj->sect)) return FR_RW_ERROR; dir = &fs->win[(dirobj->index & 15) * 32]; /* pointer to the directory entry */ c = dir[DIR_Name]; if (c == 0) break; /* Has it reached to end of dir? */ if (c != 0xE5 && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */ get_fileinfo(finfo, dir); if (!next_dir_entry(dirobj)) dirobj->sect = 0; /* Next entry */ if (finfo->fname[0]) break; /* Found valid entry */ } return FR_OK; } #if _FS_MINIMIZE == 0 /*-----------------------------------------------------------------------*/ /* Get File Status */ /*-----------------------------------------------------------------------*/ FRESULT f_stat ( const char *path, /* Pointer to the file path */ FILINFO *finfo /* Pointer to file information to return */ ) { BYTE *dir; char fn[8+3+1]; FRESULT res; DIRECTORY dirobj; res = auto_mount(&path, 0); if (res != FR_OK) return res; res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */ if (res == FR_OK) { /* Trace completed */ if (dir) /* Found an object */ get_fileinfo(finfo, dir); else /* It is root dir */ res = FR_INVALID_NAME; } return res; } #if !_FS_READONLY /*-----------------------------------------------------------------------*/ /* Get Number of Free Clusters */ /*-----------------------------------------------------------------------*/ FRESULT f_getfree ( const char *drv, /* Logical drive number */ DWORD *nclust, /* Pointer to the double word to return number of free clusters */ FATFS **fatfs /* Pointer to pointer to the file system object to return */ ) { DWORD n, sect; CLUST clust; BYTE fat, f, *p; FRESULT res; FATFS *fs; /* Get drive number */ res = auto_mount(&drv, 0); if (res != FR_OK) return res; *fatfs = fs = FatFs; /* If number of free cluster is valid, return it without cluster scan. */ if (fs->free_clust <= fs->max_clust - 2) { *nclust = fs->free_clust; return FR_OK; } /* Count number of free clusters */ fat = fs->fs_type; n = 0; if (fat == FS_FAT12) { clust = 2; do { if ((WORD)get_cluster(clust) == 0) n++; } while (++clust < fs->max_clust); } else { clust = fs->max_clust; sect = fs->fatbase; f = 0; p = 0; do { if (!f) { if (!move_window(sect++)) return FR_RW_ERROR; p = fs->win; } if (!_FAT32 || fat == FS_FAT16) { if (LD_WORD(p) == 0) n++; p += 2; f += 1; } else { if (LD_DWORD(p) == 0) n++; p += 4; f += 2; } } while (--clust); } fs->free_clust = n; #if _USE_FSINFO if (fat == FS_FAT32) fs->fsi_flag = 1; #endif *nclust = n; return FR_OK; } /*-----------------------------------------------------------------------*/ /* Delete a File or a Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_unlink ( const char *path /* Pointer to the file or directory path */ ) { BYTE *dir, *sdir; DWORD dsect; char fn[8+3+1]; CLUST dclust; FRESULT res; DIRECTORY dirobj; FATFS *fs = FatFs; res = auto_mount(&path, 1); if (res != FR_OK) return res; res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */ if (res != FR_OK) return res; /* Trace failed */ if (dir == NULL) return FR_INVALID_NAME; /* It is the root directory */ if (dir[DIR_Attr] & AM_RDO) return FR_DENIED; /* It is a R/O object */ dsect = fs->winsect; dclust = #if _FAT32 ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | #endif LD_WORD(&dir[DIR_FstClusLO]); if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */ dirobj.clust = dclust; /* Check if the sub-dir is empty or not */ dirobj.sect = clust2sect(dclust); dirobj.index = 2; do { if (!move_window(dirobj.sect)) return FR_RW_ERROR; sdir = &fs->win[(dirobj.index & 15) * 32]; if (sdir[DIR_Name] == 0) break; if (sdir[DIR_Name] != 0xE5 && !(sdir[DIR_Attr] & AM_VOL)) return FR_DENIED; /* The directory is not empty */ } while (next_dir_entry(&dirobj)); } if (!move_window(dsect)) return FR_RW_ERROR; /* Mark the directory entry 'deleted' */ dir[DIR_Name] = 0xE5; fs->winflag = 1; if (!remove_chain(dclust)) return FR_RW_ERROR; /* Remove the cluster chain */ return sync(); } /*-----------------------------------------------------------------------*/ /* Create a Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_mkdir ( const char *path /* Pointer to the directory path */ ) { BYTE *dir, *fw, n; char fn[8+3+1]; DWORD sect, dsect, tim; CLUST dclust, pclust; FRESULT res; DIRECTORY dirobj; FATFS *fs = FatFs; res = auto_mount(&path, 1); if (res != FR_OK) return res; res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */ if (res == FR_OK) return FR_EXIST; /* Any file or directory is already existing */ if (res != FR_NO_FILE) return res; res = reserve_direntry(&dirobj, &dir); /* Reserve a directory entry */ if (res != FR_OK) return res; sect = fs->winsect; dclust = create_chain(0); /* Allocate a cluster for new directory table */ if (dclust == 1) return FR_RW_ERROR; dsect = clust2sect(dclust); if (!dsect) return FR_DENIED; if (!move_window(dsect)) return FR_RW_ERROR; fw = fs->win; memset(fw, 0, 512); /* Clear the directory table */ for (n = 1; n < fs->sects_clust; n++) { if (disk_write(0, fw, ++dsect, 1) != RES_OK) return FR_RW_ERROR; } memset(&fw[DIR_Name], ' ', 8+3); /* Create "." entry */ fw[DIR_Name] = '.'; fw[DIR_Attr] = AM_DIR; tim = get_fattime(); ST_DWORD(&fw[DIR_WrtTime], tim); memcpy(&fw[32], &fw[0], 32); fw[33] = '.'; /* Create ".." entry */ pclust = dirobj.sclust; #if _FAT32 ST_WORD(&fw[ DIR_FstClusHI], dclust >> 16); if (fs->fs_type == FS_FAT32 && pclust == fs->dirbase) pclust = 0; ST_WORD(&fw[32+DIR_FstClusHI], pclust >> 16); #endif ST_WORD(&fw[ DIR_FstClusLO], dclust); ST_WORD(&fw[32+DIR_FstClusLO], pclust); fs->winflag = 1; if (!move_window(sect)) return FR_RW_ERROR; memset(&dir[0], 0, 32); /* Clean-up the new entry */ memcpy(&dir[DIR_Name], fn, 8+3); /* Name */ dir[DIR_NTres] = fn[11]; dir[DIR_Attr] = AM_DIR; /* Attribute */ ST_DWORD(&dir[DIR_WrtTime], tim); /* Crated time */ ST_WORD(&dir[DIR_FstClusLO], dclust); /* Table start cluster */ #if _FAT32 ST_WORD(&dir[DIR_FstClusHI], dclust >> 16); #endif return sync(); } /*-----------------------------------------------------------------------*/ /* Change File Attribute */ /*-----------------------------------------------------------------------*/ FRESULT f_chmod ( const char *path, /* Pointer to the file path */ BYTE value, /* Attribute bits */ BYTE mask /* Attribute mask to change */ ) { FRESULT res; BYTE *dir; DIRECTORY dirobj; char fn[8+3+1]; res = auto_mount(&path, 1); if (res == FR_OK) { res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */ if (res == FR_OK) { /* Trace completed */ if (dir == NULL) { res = FR_INVALID_NAME; } else { 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 */ res = sync(); } } } return res; } /*-----------------------------------------------------------------------*/ /* Rename File/Directory */ /*-----------------------------------------------------------------------*/ FRESULT f_rename ( const char *path_old, /* Pointer to the old name */ const char *path_new /* Pointer to the new name */ ) { FRESULT res; DWORD sect_old; BYTE *dir_old, *dir_new, direntry[32-11]; DIRECTORY dirobj; char fn[8+3+1]; FATFS *fs = FatFs; res = auto_mount(&path_old, 1); if (res != FR_OK) return res; res = trace_path(&dirobj, fn, path_old, &dir_old); /* Check old object */ if (res != FR_OK) return res; /* The old object is not found */ if (!dir_old) return FR_NO_FILE; sect_old = fs->winsect; /* Save the object information */ memcpy(direntry, &dir_old[11], 32-11); res = trace_path(&dirobj, fn, path_new, &dir_new); /* Check new object */ if (res == FR_OK) return FR_EXIST; /* The new object name is already existing */ if (res != FR_NO_FILE) return res; /* Is there no old name? */ res = reserve_direntry(&dirobj, &dir_new); /* Reserve a directory entry */ if (res != FR_OK) return res; memcpy(&dir_new[DIR_Attr], direntry, 32-11); /* Create new entry */ memcpy(&dir_new[DIR_Name], fn, 8+3); dir_new[DIR_NTres] = fn[11]; fs->winflag = 1; if (!move_window(sect_old)) return FR_RW_ERROR; /* Remove old entry */ dir_old[DIR_Name] = 0xE5; return sync(); } #endif /* !_FS_READONLY */ #endif /* _FS_MINIMIZE == 0 */ #endif /* _FS_MINIMIZE <= 1 */ #endif /* _FS_MINIMIZE <= 2 */