| 0,0 → 1,1580 |
|---|
| /*--------------------------------------------------------------------------/ |
| / 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. |
| / xxx xx, 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 <string.h> |
| #include "tff.h" /* Tiny-FatFs declarations */ |
| #include "diskio.h" /* Include file for user provided disk functions */ |
| |
| |
| 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 */ |
| DIR *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 */ |
| DIR *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 */ |
| DIR *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; |
| DIR 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 */ |
| void *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 = 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 ( |
| DIR *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 ( |
| DIR *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; |
| DIR 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; |
| DIR 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; |
| DIR 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; |
| DIR 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]; |
| DIR 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 */ |
| |