/*----------------------------------------------------------------------------// FatFs - FAT file system module R0.06 (C)ChaN, 2008/-----------------------------------------------------------------------------// 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) 2008, 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/ commercial use without restriction under your responsibility./ * Redistributions of source code must retain the above copyright notice.//-----------------------------------------------------------------------------// Feb 26,'06 R0.00 Prototype.// Apr 29,'06 R0.01 First stable version.// Jun 01,'06 R0.02 Added FAT12 support./ Removed unbuffered mode./ Fixed a problem on small (<32M) patition./ Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).// Sep 22,'06 R0.03 Added f_rename()./ Changed option _FS_MINIMUM to _FS_MINIMIZE./ Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast./ Fixed f_mkdir() creates incorrect directory on FAT32.// Feb 04,'07 R0.04 Supported multiple drive system./ Changed some interfaces for multiple drive system./ Changed f_mountdrv() to f_mount()./ Added f_mkfs()./ Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive./ Added a capability of extending file size to f_lseek()./ Added minimization level 3./ Fixed an endian sensitive code in f_mkfs()./ May 05,'07 R0.04b Added a configuration option _USE_NTFLAG./ Added FSInfo support./ Fixed DBCS name can result FR_INVALID_NAME./ Fixed short seek (<= csize) collapses the file object.// Aug 25,'07 R0.05 Changed arguments of f_read(), f_write() and f_mkfs()./ Fixed f_mkfs() on FAT32 creates incorrect FSInfo./ Fixed f_mkdir() on FAT32 creates incorrect directory./ Feb 03,'08 R0.05a Added f_truncate() and f_utime()./ Fixed off by one error at FAT sub-type determination./ Fixed btr in f_read() can be mistruncated./ Fixed cached sector is not flushed when create and close/ without write.// Apr 01,'08 R0.06 Added fputc(), fputs(), fprintf() and fgets()./ Improved performance of f_lseek() on moving to the same/ or following cluster./---------------------------------------------------------------------------*/#include <string.h>#include "ff.h" /* FatFs declarations */#include "diskio.h" /* Include file for user provided disk functions *//*--------------------------------------------------------------------------Module Private Functions---------------------------------------------------------------------------*/staticFATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */staticWORD fsid; /* File system mount ID *//*-----------------------------------------------------------------------*//* Change window offset *//*-----------------------------------------------------------------------*/staticBOOL move_window ( /* TRUE: successful, FALSE: failed */FATFS *fs, /* File system object */DWORD sector /* Sector number to make apperance in the fs->win[] */) /* Move to zero only writes back dirty window */{DWORD wsect;wsect = fs->winsect;if (wsect != sector) { /* Changed current window */#if !_FS_READONLYBYTE n;if (fs->winflag) { /* Write back dirty window if needed */if (disk_write(fs->drive, 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 FAT copy */wsect += fs->sects_fat;disk_write(fs->drive, fs->win, wsect, 1);}}}#endifif (sector) {if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK)return FALSE;fs->winsect = sector;}}return TRUE;}/*-----------------------------------------------------------------------*//* Clean-up cached data *//*-----------------------------------------------------------------------*/#if !_FS_READONLYstaticFRESULT sync ( /* FR_OK: successful, FR_RW_ERROR: failed */FATFS *fs /* File system object */){fs->winflag = 1;if (!move_window(fs, 0)) return FR_RW_ERROR;#if _USE_FSINFO/* Update FSInfo sector if needed */if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {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(fs->drive, fs->win, fs->fsi_sector, 1);fs->fsi_flag = 0;}#endif/* Make sure that no pending write process in the physical drive */if (disk_ioctl(fs->drive, CTRL_SYNC, NULL) != RES_OK)return FR_RW_ERROR;return FR_OK;}#endif/*-----------------------------------------------------------------------*//* Get a cluster status *//*-----------------------------------------------------------------------*/staticDWORD get_cluster ( /* 0,>=2: successful, 1: failed */FATFS *fs, /* File system object */DWORD clust /* Cluster# to get the link information */){WORD wc, bc;DWORD fatsect;if (clust >= 2 && clust < fs->max_clust) { /* Is it a valid cluster#? */fatsect = fs->fatbase;switch (fs->fs_type) {case FS_FAT12 :bc = (WORD)clust * 3 / 2;if (!move_window(fs, fatsect + (bc / SS(fs)))) break;wc = fs->win[bc & (SS(fs) - 1)]; bc++;if (!move_window(fs, fatsect + (bc / SS(fs)))) break;wc |= (WORD)fs->win[bc & (SS(fs) - 1)] << 8;return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);case FS_FAT16 :if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) break;return LD_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)]);case FS_FAT32 :if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) break;return LD_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF;}}return 1; /* Out of cluster range, or an error occured */}/*-----------------------------------------------------------------------*//* Change a cluster status *//*-----------------------------------------------------------------------*/#if !_FS_READONLYstaticBOOL put_cluster ( /* TRUE: successful, FALSE: failed */FATFS *fs, /* File system object */DWORD clust, /* Cluster# to change (must be 2 to fs->max_clust-1) */DWORD val /* New value to mark the cluster */){WORD bc;BYTE *p;DWORD fatsect;fatsect = fs->fatbase;switch (fs->fs_type) {case FS_FAT12 :bc = (WORD)clust * 3 / 2;if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;p = &fs->win[bc & (SS(fs) - 1)];*p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;bc++;fs->winflag = 1;if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;p = &fs->win[bc & (SS(fs) - 1)];*p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));break;case FS_FAT16 :if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) return FALSE;ST_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)], (WORD)val);break;case FS_FAT32 :if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) return FALSE;ST_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)], val);break;default :return FALSE;}fs->winflag = 1;return TRUE;}#endif /* !_FS_READONLY *//*-----------------------------------------------------------------------*//* Remove a cluster chain *//*-----------------------------------------------------------------------*/#if !_FS_READONLYstaticBOOL remove_chain ( /* TRUE: successful, FALSE: failed */FATFS *fs, /* File system object */DWORD clust /* Cluster# to remove chain from */){DWORD nxt;while (clust >= 2 && clust < fs->max_clust) {nxt = get_cluster(fs, clust);if (nxt == 1) return FALSE;if (!put_cluster(fs, clust, 0)) return FALSE;if (fs->free_clust != 0xFFFFFFFF) {fs->free_clust++;#if _USE_FSINFOfs->fsi_flag = 1;#endif}clust = nxt;}return TRUE;}#endif/*-----------------------------------------------------------------------*//* Stretch or create a cluster chain *//*-----------------------------------------------------------------------*/#if !_FS_READONLYstaticDWORD create_chain ( /* 0: No free cluster, 1: Error, >=2: New cluster number */FATFS *fs, /* File system object */DWORD clust /* Cluster# to stretch, 0 means create new */){DWORD cstat, ncl, scl, mcl = fs->max_clust;if (clust == 0) { /* Create new chain */scl = fs->last_clust; /* Get suggested start point */if (scl == 0 || scl >= mcl) scl = 1;}else { /* Stretch existing chain */cstat = get_cluster(fs, 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(fs, 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(fs, ncl, 0x0FFFFFFF)) return 1; /* Mark the new cluster "in use" */if (clust != 0 && !put_cluster(fs, clust, ncl)) return 1; /* Link it to previous one if needed */fs->last_clust = ncl; /* Update fsinfo */if (fs->free_clust != 0xFFFFFFFF) {fs->free_clust--;#if _USE_FSINFOfs->fsi_flag = 1;#endif}return ncl; /* Return new cluster number */}#endif /* !_FS_READONLY *//*-----------------------------------------------------------------------*//* Get sector# from cluster# *//*-----------------------------------------------------------------------*/staticDWORD clust2sect ( /* !=0: sector number, 0: failed - invalid cluster# */FATFS *fs, /* File system object */DWORD clust /* Cluster# to be converted */){clust -= 2;if (clust >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */return clust * fs->csize + fs->database;}/*-----------------------------------------------------------------------*//* Move directory pointer to next *//*-----------------------------------------------------------------------*/staticBOOL next_dir_entry ( /* TRUE: successful, FALSE: could not move next */DIR *dj /* Pointer to directory object */){DWORD clust;WORD idx;idx = dj->index + 1;if ((idx & ((SS(dj->fs) - 1) / 32)) == 0) { /* Table sector changed? */dj->sect++; /* Next sector */if (dj->clust == 0) { /* In static table */if (idx >= dj->fs->n_rootdir) return FALSE; /* Reached to end of table */} else { /* In dynamic table */if (((idx / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */clust = get_cluster(dj->fs, dj->clust); /* Get next cluster */if (clust < 2 || clust >= dj->fs->max_clust) /* Reached to end of table */return FALSE;dj->clust = clust; /* Initialize for new cluster */dj->sect = clust2sect(dj->fs, clust);}}}dj->index = idx; /* Lower several bits of dj->index indicates offset in dj->sect */return TRUE;}/*-----------------------------------------------------------------------*//* Get file status from directory entry *//*-----------------------------------------------------------------------*/#if _FS_MINIMIZE <= 1staticvoid 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 *//*-----------------------------------------------------------------------*/staticchar 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 ^= 0x01; 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 &= 0xF7) : (b &= 0xEF);if (c >= 'a' && c <= 'z') { /* Convert to upper case */c -= 0x20;if (_USE_NTFLAG) (t == 8) ? (a |= 0x08) : (a |= 0x10);}}md_l1:a &= 0xFE;md_l2:if (n >= t) break;dirname[n++] = c;}return 1;}/*-----------------------------------------------------------------------*//* Trace a file path *//*-----------------------------------------------------------------------*/staticFRESULT trace_path ( /* FR_OK(0): successful, !=0: error code */DIR *dj, /* Pointer to directory object to return last directory */char *fn, /* Pointer to last segment name to return {file(8),ext(3),attr(1)} */const char *path, /* Full-path string to trace a file or directory */BYTE **dir /* Pointer to pointer to found entry to retutn */){DWORD clust;char ds;BYTE *dptr = NULL;FATFS *fs = dj->fs;/* Initialize directory object */clust = fs->dirbase;if (fs->fs_type == FS_FAT32) {dj->clust = dj->sclust = clust;dj->sect = clust2sect(fs, clust);} else {dj->clust = dj->sclust = 0;dj->sect = clust;}dj->index = 0;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(fs, dj->sect)) return FR_RW_ERROR;dptr = &fs->win[(dj->index & ((SS(fs) - 1) / 32)) * 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(dj)) /* 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 = ((DWORD)LD_WORD(&dptr[DIR_FstClusHI]) << 16) | LD_WORD(&dptr[DIR_FstClusLO]); /* Get cluster# of the directory */dj->clust = dj->sclust = clust; /* Restart scanning at the new directory */dj->sect = clust2sect(fs, clust);dj->index = 2;}}/*-----------------------------------------------------------------------*//* Reserve a directory entry *//*-----------------------------------------------------------------------*/#if !_FS_READONLYstaticFRESULT reserve_direntry ( /* FR_OK: successful, FR_DENIED: no free entry, FR_RW_ERROR: a disk error occured */DIR *dj, /* Target directory to create new entry */BYTE **dir /* Pointer to pointer to created entry to retutn */){DWORD clust, sector;BYTE c, n, *dptr;FATFS *fs = dj->fs;/* Re-initialize directory object */clust = dj->sclust;if (clust != 0) { /* Dyanmic directory table */dj->clust = clust;dj->sect = clust2sect(fs, clust);} else { /* Static directory table */dj->sect = fs->dirbase;}dj->index = 0;do {if (!move_window(fs, dj->sect)) return FR_RW_ERROR;dptr = &fs->win[(dj->index & ((SS(dj->fs) - 1) / 32)) * 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(dj)); /* Next directory pointer *//* Reached to end of the directory table *//* Abort when it is a static table or could not stretch dynamic table */if (clust == 0 || !(clust = create_chain(fs, dj->clust))) return FR_DENIED;if (clust == 1 || !move_window(fs, 0)) return FR_RW_ERROR;/* Cleanup the expanded table */fs->winsect = sector = clust2sect(fs, clust);memset(fs->win, 0, SS(fs));for (n = fs->csize; n; n--) {if (disk_write(fs->drive, 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 an FAT boot record *//*-----------------------------------------------------------------------*/staticBYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record or error */FATFS *fs, /* File system object */DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */){if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK) /* Load boot record */return 2;if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature (always placed at offset 510 even if the sector size is >512) */return 2;if (!memcmp(&fs->win[BS_FilSysType], "FAT", 3)) /* Check FAT signature */return 0;if (!memcmp(&fs->win[BS_FilSysType32], "FAT32", 5) && !(fs->win[BPB_ExtFlags] & 0x80))return 0;return 1;}/*-----------------------------------------------------------------------*//* Make sure that the file system is valid *//*-----------------------------------------------------------------------*/staticFRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */const char **path, /* Pointer to pointer to the path name (drive number) */FATFS **rfs, /* Pointer to pointer to the found file system object */BYTE chk_wp /* !=0: Check media write protection for write access */){BYTE drv, fmt, *tbl;DSTATUS stat;DWORD bootsect, fatsize, totalsect, maxclust;const char *p = *path;FATFS *fs;/* Get drive number from the path name */while (*p == ' ') p++; /* Strip leading spaces */drv = p[0] - '0'; /* Is there a drive number? */if (drv <= 9 && p[1] == ':')p += 2; /* Found a drive number, get and strip it */elsedrv = 0; /* No drive number is given, use drive number 0 as default */if (*p == '/') p++; /* Strip heading slash */*path = p; /* Return pointer to the path name *//* Check if the drive number is valid or not */if (drv >= _DRIVES) return FR_INVALID_DRIVE; /* Is the drive number valid? */*rfs = fs = FatFs[drv]; /* Returen pointer to the corresponding file system object */if (!fs) return FR_NOT_ENABLED; /* Is the file system object registered? */if (fs->fs_type) { /* If the logical drive has been mounted */stat = disk_status(fs->drive);if (!(stat & STA_NOINIT)) { /* and physical drive is kept initialized (has not been changed), */#if !_FS_READONLYif (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */return FR_WRITE_PROTECTED;#endifreturn FR_OK; /* The file system object is valid */}}/* The logical drive must be re-mounted. Following code attempts to mount the logical drive */memset(fs, 0, sizeof(FATFS)); /* Clean-up the file system object */fs->drive = LD2PD(drv); /* Bind the logical drive and a physical drive */stat = disk_initialize(fs->drive); /* Initialize low level disk I/O layer */if (stat & STA_NOINIT) /* Check if the drive is ready */return FR_NOT_READY;#if S_MAX_SIZ > 512 /* Get disk sector size if needed */if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > S_MAX_SIZ)return FR_NO_FILESYSTEM;#endif#if !_FS_READONLYif (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */return FR_WRITE_PROTECTED;#endif/* Search FAT partition on the drive */fmt = check_fs(fs, bootsect = 0); /* Check sector 0 as an SFD format */if (fmt == 1) { /* Not an FAT boot record, it may be patitioned *//* Check a partition listed in top of the partition table */tbl = &fs->win[MBR_Table + LD2PT(drv) * 16]; /* Partition table */if (tbl[4]) { /* Is the partition existing? */bootsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */fmt = check_fs(fs, bootsect); /* Check the partition */}}if (fmt || LD_WORD(&fs->win[BPB_BytsPerSec]) != SS(fs)) /* No valid FAT patition is found */return FR_NO_FILESYSTEM;/* Initialize the file system object */fatsize = LD_WORD(&fs->win[BPB_FATSz16]); /* Number of sectors per FAT */if (!fatsize) fatsize = LD_DWORD(&fs->win[BPB_FATSz32]);fs->sects_fat = 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->csize = 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 /* max_clust = Last cluster# + 1 */- LD_WORD(&fs->win[BPB_RsvdSecCnt]) - fatsize - fs->n_rootdir / (SS(fs)/32)) / fs->csize + 2;fmt = FS_FAT12; /* Determine the FAT sub type */if (maxclust >= 0xFF7) fmt = FS_FAT16;if (maxclust >= 0xFFF7) fmt = FS_FAT32;if (fmt == FS_FAT32)fs->dirbase = LD_DWORD(&fs->win[BPB_RootClus]); /* Root directory start cluster */elsefs->dirbase = fs->fatbase + fatsize; /* Root directory start sector (lba) */fs->database = fs->fatbase + fatsize + fs->n_rootdir / (SS(fs)/32); /* Data start sector (lba) */#if !_FS_READONLY/* Initialize allocation information */fs->free_clust = 0xFFFFFFFF;#if _USE_FSINFO/* Get fsinfo if needed */if (fmt == FS_FAT32) {fs->fsi_sector = bootsect + LD_WORD(&fs->win[BPB_FSInfo]);if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&LD_WORD(&fs->win[BS_55AA]) == 0xAA55 &&LD_DWORD(&fs->win[FSI_LeadSig]) == 0x41615252 &&LD_DWORD(&fs->win[FSI_StrucSig]) == 0x61417272) {fs->last_clust = LD_DWORD(&fs->win[FSI_Nxt_Free]);fs->free_clust = LD_DWORD(&fs->win[FSI_Free_Count]);}}#endif#endiffs->fs_type = fmt; /* FAT syb-type */fs->id = ++fsid; /* File system mount ID */return FR_OK;}/*-----------------------------------------------------------------------*//* Check if the file/dir object is valid or not *//*-----------------------------------------------------------------------*/staticFRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */const FATFS *fs, /* Pointer to the file system object */WORD id /* Member id of the target object to be checked */){if (!fs || !fs->fs_type || fs->id != id)return FR_INVALID_OBJECT;if (disk_status(fs->drive) & STA_NOINIT)return FR_NOT_READY;return FR_OK;}/*--------------------------------------------------------------------------Public Functions--------------------------------------------------------------------------*//*-----------------------------------------------------------------------*//* Mount/Unmount a Locical Drive *//*-----------------------------------------------------------------------*/FRESULT f_mount (BYTE drv, /* Logical drive number to be mounted/unmounted */FATFS *fs /* Pointer to new file system object (NULL for unmount)*/){if (drv >= _DRIVES) return FR_INVALID_DRIVE;if (FatFs[drv]) FatFs[drv]->fs_type = 0; /* Clear old object */FatFs[drv] = fs; /* Register and clear new object */if (fs) fs->fs_type = 0;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;DIR dj;BYTE *dir;char fn[8+3+1];fp->fs = NULL; /* Clear file object */#if !_FS_READONLYmode &= (FA_READ|FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW);res = auto_mount(&path, &dj.fs, (BYTE)(mode & (FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW)));#elsemode &= FA_READ;res = auto_mount(&path, &dj.fs, 0);#endifif (res != FR_OK) return res;res = trace_path(&dj, 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)) {DWORD ps, rs;if (res != FR_OK) { /* No file, create new */if (res != FR_NO_FILE) return res;res = reserve_direntry(&dj, &dir);if (res != FR_OK) return res;memset(dir, 0, 32); /* Initialize the new entry with open name */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 || (dir[DIR_Attr] & (AM_RDO|AM_DIR))) /* Cannot overwrite it (R/O or DIR) */return FR_DENIED;if (mode & FA_CREATE_ALWAYS) { /* Resize it to zero if needed */rs = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]); /* Get start cluster */ST_WORD(&dir[DIR_FstClusHI], 0); /* cluster = 0 */ST_WORD(&dir[DIR_FstClusLO], 0);ST_DWORD(&dir[DIR_FileSize], 0); /* size = 0 */dj.fs->winflag = 1;ps = dj.fs->winsect; /* Remove the cluster chain */if (!remove_chain(dj.fs, rs) || !move_window(dj.fs, ps))return FR_RW_ERROR;dj.fs->last_clust = rs - 1; /* Reuse the cluster hole */}}if (mode & FA_CREATE_ALWAYS) {dir[DIR_Attr] = 0; /* Reset attribute */ps = get_fattime();ST_DWORD(&dir[DIR_CrtTime], ps); /* Created time */dj.fs->winflag = 1;mode |= FA__WRITTEN; /* Set file changed flag */}}/* Open an existing file */else {#endif /* !_FS_READONLY */if (res != FR_OK) return res; /* Trace failed */if (!dir || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */return FR_NO_FILE;#if !_FS_READONLYif ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */return FR_DENIED;}fp->dir_sect = dj.fs->winsect; /* Pointer to the directory entry */fp->dir_ptr = dir;#endiffp->flag = mode; /* File access mode */fp->org_clust = /* File start cluster */((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);fp->fsize = LD_DWORD(&dir[DIR_FileSize]); /* File size */fp->fptr = 0; fp->csect = 255; /* File pointer */fp->curr_sect = 0;fp->fs = dj.fs; fp->id = dj.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 */UINT btr, /* Number of bytes to read */UINT *br /* Pointer to number of bytes read */){FRESULT res;DWORD clust, sect, remain;UINT rcnt, cc;BYTE *rbuff = buff;*br = 0;res = validate(fp->fs, fp->id); /* Check validity of the object */if (res != FR_OK) 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 = (UINT)remain; /* Truncate btr by remaining bytes */for ( ; btr; /* Repeat until all data transferred */rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */clust = (fp->fptr == 0) ? /* On the top of the file? */fp->org_clust : get_cluster(fp->fs, fp->curr_clust);if (clust < 2 || clust >= fp->fs->max_clust) goto fr_error;fp->curr_clust = clust; /* Update current cluster */fp->csect = 0; /* Reset sector address in the cluster */}sect = clust2sect(fp->fs, fp->curr_clust) + fp->csect; /* Get current sector */cc = btr / SS(fp->fs); /* When remaining bytes >= sector size, */if (cc) { /* Read maximum contiguous sectors directly */if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */cc = fp->fs->csize - fp->csect;if (disk_read(fp->fs->drive, rbuff, sect, (BYTE)cc) != RES_OK)goto fr_error;fp->csect += (BYTE)cc; /* Next sector address in the cluster */rcnt = SS(fp->fs) * cc; /* Number of bytes transferred */continue;}if (sect != fp->curr_sect) { /* Is window offset changed? */#if !_FS_READONLYif (fp->flag & FA__DIRTY) { /* Write back file I/O buffer if needed */if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)goto fr_error;fp->flag &= (BYTE)~FA__DIRTY;}#endifif (disk_read(fp->fs->drive, fp->buffer, sect, 1) != RES_OK) /* Fill file I/O buffer with file data */goto fr_error;fp->curr_sect = sect;}fp->csect++; /* Next sector address in the cluster */}rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Get partial sector from file I/O buffer */if (rcnt > btr) rcnt = btr;memcpy(rbuff, &fp->buffer[fp->fptr % SS(fp->fs)], rcnt);}return FR_OK;fr_error: /* Abort this file 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 */UINT btw, /* Number of bytes to write */UINT *bw /* Pointer to number of bytes written */){FRESULT res;DWORD clust, sect;UINT wcnt, cc;const BYTE *wbuff = buff;*bw = 0;res = validate(fp->fs, fp->id); /* Check validity of the object */if (res != FR_OK) 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 % SS(fp->fs)) == 0) { /* On the sector boundary? */if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */if (fp->fptr == 0) { /* On the top of the file? */clust = fp->org_clust; /* Follow from the origin */if (clust == 0) /* When there is no cluster chain, */fp->org_clust = clust = create_chain(fp->fs, 0); /* Create a new cluster chain */} else { /* Middle or end of the file */clust = create_chain(fp->fs, fp->curr_clust); /* Trace or streach cluster chain */}if (clust == 0) break; /* Could not allocate a new cluster (disk full) */if (clust == 1 || clust >= fp->fs->max_clust) goto fw_error;fp->curr_clust = clust; /* Update current cluster */fp->csect = 0; /* Reset sector address in the cluster */}sect = clust2sect(fp->fs, fp->curr_clust) + fp->csect; /* Get current sector */cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */if (cc) { /* Write maximum contiguous sectors directly */if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */cc = fp->fs->csize - fp->csect;if (disk_write(fp->fs->drive, wbuff, sect, (BYTE)cc) != RES_OK)goto fw_error;fp->csect += (BYTE)cc; /* Next sector address in the cluster */wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */continue;}if (sect != fp->curr_sect) { /* Is window offset changed? */if (fp->flag & FA__DIRTY) { /* Write back file I/O buffer if needed */if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)goto fw_error;fp->flag &= (BYTE)~FA__DIRTY;}if (fp->fptr < fp->fsize && /* Fill file I/O buffer with file data */disk_read(fp->fs->drive, fp->buffer, sect, 1) != RES_OK)goto fw_error;fp->curr_sect = sect;}fp->csect++; /* Next sector address in the cluster */}wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Put partial sector into file I/O buffer */if (wcnt > btw) wcnt = btw;memcpy(&fp->buffer[fp->fptr % SS(fp->fs)], wbuff, wcnt);fp->flag |= FA__DIRTY;}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 file due to an unrecoverable error */fp->flag |= FA__ERROR;return FR_RW_ERROR;}/*-----------------------------------------------------------------------*//* Synchronize the file object *//*-----------------------------------------------------------------------*/FRESULT f_sync (FIL *fp /* Pointer to the file object */){FRESULT res;DWORD tim;BYTE *dir;res = validate(fp->fs, fp->id); /* Check validity of the object */if (res == FR_OK) {if (fp->flag & FA__WRITTEN) { /* Has the file been written? *//* Write back data buffer if needed */if (fp->flag & FA__DIRTY) {if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)return FR_RW_ERROR;fp->flag &= (BYTE)~FA__DIRTY;}/* Update the directory entry */if (!move_window(fp->fs, 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 */ST_WORD(&dir[DIR_FstClusHI], fp->org_clust >> 16);tim = get_fattime(); /* Updated time */ST_DWORD(&dir[DIR_WrtTime], tim);fp->flag &= (BYTE)~FA__WRITTEN;res = sync(fp->fs);}}return res;}#endif /* !_FS_READONLY *//*-----------------------------------------------------------------------*//* Close File *//*-----------------------------------------------------------------------*/FRESULT f_close (FIL *fp /* Pointer to the file object to be closed */){FRESULT res;#if !_FS_READONLYres = f_sync(fp);#elseres = validate(fp->fs, fp->id);#endifif (res == FR_OK) fp->fs = NULL;return res;}#if _FS_MINIMIZE <= 2/*-----------------------------------------------------------------------*//* Seek File R/W Pointer *//*-----------------------------------------------------------------------*/FRESULT f_lseek (FIL *fp, /* Pointer to the file object */DWORD ofs /* File pointer from top of file */){FRESULT res;DWORD clust, csize, nsect, ifptr;res = validate(fp->fs, fp->id); /* Check validity of the object */if (res != FR_OK) return res;if (fp->flag & FA__ERROR) return FR_RW_ERROR;if (ofs > fp->fsize /* In read-only mode, clip offset with the file size */#if !_FS_READONLY&& !(fp->flag & FA_WRITE)#endif) ofs = fp->fsize;ifptr = fp->fptr;fp->fptr = 0; fp->csect = 255;nsect = 0;if (ofs > 0) {csize = (DWORD)fp->fs->csize * SS(fp->fs); /* Cluster size (byte) */if (ifptr > 0 &&(ofs - 1) / csize >= (ifptr - 1) / csize) {/* When seek to same or following cluster, */fp->fptr = (ifptr - 1) & ~(csize - 1); /* start from the current cluster */ofs -= fp->fptr;clust = fp->curr_clust;} else { /* When seek to back cluster, */clust = fp->org_clust; /* start from the first cluster */#if !_FS_READONLYif (clust == 0) { /* If no cluster chain, create a new chain */clust = create_chain(fp->fs, 0);if (clust == 1) goto fk_error;fp->org_clust = clust;}#endiffp->curr_clust = clust;}if (clust != 0) {while (ofs > csize) { /* Cluster following loop */#if !_FS_READONLYif (fp->flag & FA_WRITE) { /* Check if in write mode or not */clust = create_chain(fp->fs, clust); /* Force streached if in write mode */if (clust == 0) { /* When disk gets full, clip file size */ofs = csize; break;}} else#endifclust = get_cluster(fp->fs, clust); /* Follow cluster chain if not in write mode */if (clust < 2 || clust >= fp->fs->max_clust) goto fk_error;fp->curr_clust = clust;fp->fptr += csize;ofs -= csize;}fp->fptr += ofs;fp->csect = (BYTE)(ofs / SS(fp->fs)); /* Sector offset in the cluster */if (ofs & (SS(fp->fs) - 1)) {nsect = clust2sect(fp->fs, clust) + fp->csect; /* Current sector */fp->csect++;}}}if (nsect && nsect != fp->curr_sect) {#if !_FS_READONLYif (fp->flag & FA__DIRTY) { /* Write-back dirty buffer if needed */if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)goto fk_error;fp->flag &= (BYTE)~FA__DIRTY;}#endifif (disk_read(fp->fs->drive, fp->buffer, nsect, 1) != RES_OK)goto fk_error;fp->curr_sect = nsect;}#if !_FS_READONLYif (fp->fptr > fp->fsize) { /* Set changed flag if the file was extended */fp->fsize = fp->fptr;fp->flag |= FA__WRITTEN;}#endifreturn FR_OK;fk_error: /* Abort this file due to an unrecoverable error */fp->flag |= FA__ERROR;return FR_RW_ERROR;}#if _FS_MINIMIZE <= 1/*-----------------------------------------------------------------------*//* Create a directroy object *//*-----------------------------------------------------------------------*/FRESULT f_opendir (DIR *dj, /* Pointer to directory object to create */const char *path /* Pointer to the directory path */){FRESULT res;BYTE *dir;char fn[8+3+1];res = auto_mount(&path, &dj->fs, 0);if (res == FR_OK) {res = trace_path(dj, fn, path, &dir); /* Trace the directory path */if (res == FR_OK) { /* Trace completed */if (dir) { /* It is not the root dir */if (dir[DIR_Attr] & AM_DIR) { /* The entry is a directory */dj->clust = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);dj->sect = clust2sect(dj->fs, dj->clust);dj->index = 2;} else { /* The entry is not a directory */res = FR_NO_FILE;}}dj->id = dj->fs->id;}}return res;}/*-----------------------------------------------------------------------*//* Read Directory Entry in Sequense *//*-----------------------------------------------------------------------*/FRESULT f_readdir (DIR *dj, /* Pointer to the directory object */FILINFO *finfo /* Pointer to file information to return */){BYTE *dir, c, res;res = validate(dj->fs, dj->id); /* Check validity of the object */if (res != FR_OK) return res;finfo->fname[0] = 0;while (dj->sect) {if (!move_window(dj->fs, dj->sect))return FR_RW_ERROR;dir = &dj->fs->win[(dj->index & ((SS(dj->fs) - 1) >> 5)) * 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(dj)) dj->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 */){FRESULT res;DIR dj;BYTE *dir;char fn[8+3+1];res = auto_mount(&path, &dj.fs, 0);if (res == FR_OK) {res = trace_path(&dj, 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/*-----------------------------------------------------------------------*//* Truncate File *//*-----------------------------------------------------------------------*/FRESULT f_truncate (FIL *fp /* Pointer to the file object */){FRESULT res;DWORD ncl;res = validate(fp->fs, fp->id); /* Check validity of the object */if (res != FR_OK) 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 > fp->fptr) {fp->fsize = fp->fptr; /* Set file size to current R/W point */fp->flag |= FA__WRITTEN;if (fp->fptr == 0) { /* When set file size to zero, remove entire cluster chain */if (!remove_chain(fp->fs, fp->org_clust)) goto ft_error;fp->org_clust = 0;} else { /* When truncate a part of the file, remove remaining clusters */ncl = get_cluster(fp->fs, fp->curr_clust);if (ncl < 2) goto ft_error;if (ncl < fp->fs->max_clust) {if (!put_cluster(fp->fs, fp->curr_clust, 0x0FFFFFFF)) goto ft_error;if (!remove_chain(fp->fs, ncl)) goto ft_error;}}}return FR_OK;ft_error: /* Abort this file due to an unrecoverable error */fp->flag |= FA__ERROR;return FR_RW_ERROR;}/*-----------------------------------------------------------------------*//* Get Number of Free Clusters *//*-----------------------------------------------------------------------*/FRESULT f_getfree (const char *drv, /* Pointer to the logical drive number (root dir) */DWORD *nclust, /* Pointer to the variable to return number of free clusters */FATFS **fatfs /* Pointer to pointer to corresponding file system object to return */){FRESULT res;DWORD n, clust, sect;BYTE fat, f, *p;/* Get drive number */res = auto_mount(&drv, fatfs, 0);if (res != FR_OK) return res;/* If number of free cluster is valid, return it without cluster scan. */if ((*fatfs)->free_clust <= (*fatfs)->max_clust - 2) {*nclust = (*fatfs)->free_clust;return FR_OK;}/* Get number of free clusters */fat = (*fatfs)->fs_type;n = 0;if (fat == FS_FAT12) {clust = 2;do {if ((WORD)get_cluster(*fatfs, clust) == 0) n++;} while (++clust < (*fatfs)->max_clust);} else {clust = (*fatfs)->max_clust;sect = (*fatfs)->fatbase;f = 0; p = 0;do {if (!f) {if (!move_window(*fatfs, sect++)) return FR_RW_ERROR;p = (*fatfs)->win;}if (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);}(*fatfs)->free_clust = n;#if _USE_FSINFOif (fat == FS_FAT32) (*fatfs)->fsi_flag = 1;#endif*nclust = n;return FR_OK;}/*-----------------------------------------------------------------------*//* Delete a File or Directory *//*-----------------------------------------------------------------------*/FRESULT f_unlink (const char *path /* Pointer to the file or directory path */){FRESULT res;DIR dj;BYTE *dir, *sdir;DWORD dclust, dsect;char fn[8+3+1];res = auto_mount(&path, &dj.fs, 1);if (res != FR_OK) return res;res = trace_path(&dj, fn, path, &dir); /* Trace the file path */if (res != FR_OK) return res; /* Trace failed */if (!dir) 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 = dj.fs->winsect;dclust = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */dj.clust = dclust; /* Check if the sub-dir is empty or not */dj.sect = clust2sect(dj.fs, dclust);dj.index = 2;do {if (!move_window(dj.fs, dj.sect)) return FR_RW_ERROR;sdir = &dj.fs->win[(dj.index & ((SS(dj.fs) - 1) >> 5)) * 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(&dj));}if (!move_window(dj.fs, dsect)) return FR_RW_ERROR; /* Mark the directory entry 'deleted' */dir[DIR_Name] = 0xE5;dj.fs->winflag = 1;if (!remove_chain(dj.fs, dclust)) return FR_RW_ERROR; /* Remove the cluster chain */return sync(dj.fs);}/*-----------------------------------------------------------------------*//* Create a Directory *//*-----------------------------------------------------------------------*/FRESULT f_mkdir (const char *path /* Pointer to the directory path */){FRESULT res;DIR dj;BYTE *dir, *fw, n;char fn[8+3+1];DWORD sect, dsect, dclust, pclust, tim;res = auto_mount(&path, &dj.fs, 1);if (res != FR_OK) return res;res = trace_path(&dj, 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(&dj, &dir); /* Reserve a directory entry */if (res != FR_OK) return res;sect = dj.fs->winsect;dclust = create_chain(dj.fs, 0); /* Allocate a cluster for new directory table */if (dclust == 1) return FR_RW_ERROR;dsect = clust2sect(dj.fs, dclust);if (!dsect) return FR_DENIED;if (!move_window(dj.fs, dsect)) return FR_RW_ERROR;fw = dj.fs->win;memset(fw, 0, SS(dj.fs)); /* Clear the new directory table */for (n = 1; n < dj.fs->csize; n++) {if (disk_write(dj.fs->drive, 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 */ST_WORD(&fw[ DIR_FstClusLO], dclust);ST_WORD(&fw[ DIR_FstClusHI], dclust >> 16);pclust = dj.sclust;if (dj.fs->fs_type == FS_FAT32 && pclust == dj.fs->dirbase) pclust = 0;ST_WORD(&fw[32+DIR_FstClusLO], pclust);ST_WORD(&fw[32+DIR_FstClusHI], pclust >> 16);dj.fs->winflag = 1;if (!move_window(dj.fs, sect)) return FR_RW_ERROR;memset(&dir[0], 0, 32); /* Initialize 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 */ST_WORD(&dir[DIR_FstClusHI], dclust >> 16);return sync(dj.fs);}/*-----------------------------------------------------------------------*//* 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;DIR dj;BYTE *dir;char fn[8+3+1];res = auto_mount(&path, &dj.fs, 1);if (res == FR_OK) {res = trace_path(&dj, fn, path, &dir); /* Trace the file path */if (res == FR_OK) { /* Trace completed */if (!dir) {res = FR_INVALID_NAME; /* Root directory */} 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(dj.fs);}}}return res;}/*-----------------------------------------------------------------------*//* Change Timestamp *//*-----------------------------------------------------------------------*/FRESULT f_utime (const char *path, /* Pointer to the file/directory name */const FILINFO *finfo /* Pointer to the timestamp to be set */){FRESULT res;DIR dj;BYTE *dir;char fn[8+3+1];res = auto_mount(&path, &dj.fs, 1);if (res == FR_OK) {res = trace_path(&dj, fn, path, &dir); /* Trace the file path */if (res == FR_OK) { /* Trace completed */if (!dir) {res = FR_INVALID_NAME; /* Root directory */} else {ST_WORD(&dir[DIR_WrtTime], finfo->ftime);ST_WORD(&dir[DIR_WrtDate], finfo->fdate);res = sync(dj.fs);}}}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;DIR dj;DWORD sect_old;BYTE *dir_old, *dir_new, direntry[32-11];char fn[8+3+1];res = auto_mount(&path_old, &dj.fs, 1);if (res != FR_OK) return res;res = trace_path(&dj, 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 = dj.fs->winsect; /* Save the object information */memcpy(direntry, &dir_old[DIR_Attr], 32-11);res = trace_path(&dj, 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(&dj, &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];dj.fs->winflag = 1;if (!move_window(dj.fs, sect_old)) return FR_RW_ERROR; /* Delete old entry */dir_old[DIR_Name] = 0xE5;return sync(dj.fs);}#endif /* !_FS_READONLY */#endif /* _FS_MINIMIZE == 0 */#endif /* _FS_MINIMIZE <= 1 */#endif /* _FS_MINIMIZE <= 2 */#if _USE_MKFS && !_FS_READONLY/*-----------------------------------------------------------------------*//* Create File System on the Drive *//*-----------------------------------------------------------------------*/#define N_ROOTDIR 512 /* Multiple of 32 and <= 2048 */#define N_FATS 1 /* 1 or 2 */#define MAX_SECTOR 64000000UL /* Maximum partition size */#define MIN_SECTOR 2000UL /* Minimum partition size */FRESULT f_mkfs (BYTE drv, /* Logical drive number */BYTE partition, /* Partitioning rule 0:FDISK, 1:SFD */WORD allocsize /* Allocation unit size [bytes] */){BYTE fmt, m, *tbl;DWORD b_part, b_fat, b_dir, b_data; /* Area offset (LBA) */DWORD n_part, n_rsv, n_fat, n_dir; /* Area size */DWORD n_clust, n;FATFS *fs;DSTATUS stat;/* Check validity of the parameters */if (drv >= _DRIVES) return FR_INVALID_DRIVE;if (partition >= 2) return FR_MKFS_ABORTED;for (n = 512; n <= 32768U && n != allocsize; n <<= 1);if (n != allocsize) return FR_MKFS_ABORTED;/* Check mounted drive and clear work area */fs = FatFs[drv];if (!fs) return FR_NOT_ENABLED;fs->fs_type = 0;drv = LD2PD(drv);/* Get disk statics */stat = disk_initialize(drv);if (stat & STA_NOINIT) return FR_NOT_READY;if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_part) != RES_OK || n_part < MIN_SECTOR)return FR_MKFS_ABORTED;if (n_part > MAX_SECTOR) n_part = MAX_SECTOR;b_part = (!partition) ? 63 : 0; /* Boot sector */n_part -= b_part;#if S_MAX_SIZ > 512 /* Check disk sector size */if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK|| SS(fs) > S_MAX_SIZ|| SS(fs) > allocsize)return FR_MKFS_ABORTED;#endifallocsize /= SS(fs); /* Number of sectors per cluster *//* Pre-compute number of clusters and FAT type */n_clust = n_part / allocsize;fmt = FS_FAT12;if (n_clust >= 0xFF5) fmt = FS_FAT16;if (n_clust >= 0xFFF5) fmt = FS_FAT32;/* Determine offset and size of FAT structure */switch (fmt) {case FS_FAT12:n_fat = ((n_clust * 3 + 1) / 2 + 3 + SS(fs) - 1) / SS(fs);n_rsv = 1 + partition;n_dir = N_ROOTDIR * 32 / SS(fs);break;case FS_FAT16:n_fat = ((n_clust * 2) + 4 + SS(fs) - 1) / SS(fs);n_rsv = 1 + partition;n_dir = N_ROOTDIR * 32 / SS(fs);break;default:n_fat = ((n_clust * 4) + 8 + SS(fs) - 1) / SS(fs);n_rsv = 33 - partition;n_dir = 0;}b_fat = b_part + n_rsv; /* FATs start sector */b_dir = b_fat + n_fat * N_FATS; /* Directory start sector */b_data = b_dir + n_dir; /* Data start sector *//* Align data start sector to erase block boundary (for flash memory media) */if (disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK) return FR_MKFS_ABORTED;n = (b_data + n - 1) & ~(n - 1);n_fat += (n - b_data) / N_FATS;/* b_dir and b_data are no longer used below *//* Determine number of cluster and final check of validity of the FAT type */n_clust = (n_part - n_rsv - n_fat * N_FATS - n_dir) / allocsize;if ( (fmt == FS_FAT16 && n_clust < 0xFF5)|| (fmt == FS_FAT32 && n_clust < 0xFFF5))return FR_MKFS_ABORTED;/* Create partition table if needed */if (!partition) {DWORD n_disk = b_part + n_part;tbl = &fs->win[MBR_Table];ST_DWORD(&tbl[0], 0x00010180); /* Partition start in CHS */if (n_disk < 63UL * 255 * 1024) { /* Partition end in CHS */n_disk = n_disk / 63 / 255;tbl[7] = (BYTE)n_disk;tbl[6] = (BYTE)((n_disk >> 2) | 63);} else {ST_WORD(&tbl[6], 0xFFFF);}tbl[5] = 254;if (fmt != FS_FAT32) /* System ID */tbl[4] = (n_part < 0x10000) ? 0x04 : 0x06;elsetbl[4] = 0x0c;ST_DWORD(&tbl[8], 63); /* Partition start in LBA */ST_DWORD(&tbl[12], n_part); /* Partition size in LBA */ST_WORD(&tbl[64], 0xAA55); /* Signature */if (disk_write(drv, fs->win, 0, 1) != RES_OK)return FR_RW_ERROR;}/* Create boot record */tbl = fs->win; /* Clear buffer */memset(tbl, 0, SS(fs));ST_DWORD(&tbl[BS_jmpBoot], 0x90FEEB); /* Boot code (jmp $, nop) */ST_WORD(&tbl[BPB_BytsPerSec], SS(fs)); /* Sector size */tbl[BPB_SecPerClus] = (BYTE)allocsize; /* Sectors per cluster */ST_WORD(&tbl[BPB_RsvdSecCnt], n_rsv); /* Reserved sectors */tbl[BPB_NumFATs] = N_FATS; /* Number of FATs */ST_WORD(&tbl[BPB_RootEntCnt], SS(fs) / 32 * n_dir); /* Number of rootdir entries */if (n_part < 0x10000) { /* Number of total sectors */ST_WORD(&tbl[BPB_TotSec16], n_part);} else {ST_DWORD(&tbl[BPB_TotSec32], n_part);}tbl[BPB_Media] = 0xF8; /* Media descripter */ST_WORD(&tbl[BPB_SecPerTrk], 63); /* Number of sectors per track */ST_WORD(&tbl[BPB_NumHeads], 255); /* Number of heads */ST_DWORD(&tbl[BPB_HiddSec], b_part); /* Hidden sectors */n = get_fattime(); /* Use current time as a VSN */if (fmt != FS_FAT32) {ST_DWORD(&tbl[BS_VolID], n); /* Volume serial number */ST_WORD(&tbl[BPB_FATSz16], n_fat); /* Number of secters per FAT */tbl[BS_DrvNum] = 0x80; /* Drive number */tbl[BS_BootSig] = 0x29; /* Extended boot signature */memcpy(&tbl[BS_VolLab], "NO NAME FAT ", 19); /* Volume lavel, FAT signature */} else {ST_DWORD(&tbl[BS_VolID32], n); /* Volume serial number */ST_DWORD(&tbl[BPB_FATSz32], n_fat); /* Number of secters per FAT */ST_DWORD(&tbl[BPB_RootClus], 2); /* Root directory cluster (2) */ST_WORD(&tbl[BPB_FSInfo], 1); /* FSInfo record (bs+1) */ST_WORD(&tbl[BPB_BkBootSec], 6); /* Backup boot record (bs+6) */tbl[BS_DrvNum32] = 0x80; /* Drive number */tbl[BS_BootSig32] = 0x29; /* Extended boot signature */memcpy(&tbl[BS_VolLab32], "NO NAME FAT32 ", 19); /* Volume lavel, FAT signature */}ST_WORD(&tbl[BS_55AA], 0xAA55); /* Signature */if (disk_write(drv, tbl, b_part+0, 1) != RES_OK)return FR_RW_ERROR;if (fmt == FS_FAT32)disk_write(drv, tbl, b_part+6, 1);/* Initialize FAT area */for (m = 0; m < N_FATS; m++) {memset(tbl, 0, SS(fs)); /* 1st sector of the FAT */if (fmt != FS_FAT32) {n = (fmt == FS_FAT12) ? 0x00FFFFF8 : 0xFFFFFFF8;ST_DWORD(&tbl[0], n); /* Reserve cluster #0-1 (FAT12/16) */} else {ST_DWORD(&tbl[0], 0xFFFFFFF8); /* Reserve cluster #0-1 (FAT32) */ST_DWORD(&tbl[4], 0xFFFFFFFF);ST_DWORD(&tbl[8], 0x0FFFFFFF); /* Reserve cluster #2 for root dir */}if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)return FR_RW_ERROR;memset(tbl, 0, SS(fs)); /* Following FAT entries are filled by zero */for (n = 1; n < n_fat; n++) {if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)return FR_RW_ERROR;}}/* Initialize Root directory */m = (BYTE)((fmt == FS_FAT32) ? allocsize : n_dir);do {if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)return FR_RW_ERROR;} while (--m);/* Create FSInfo record if needed */if (fmt == FS_FAT32) {ST_WORD(&tbl[BS_55AA], 0xAA55);ST_DWORD(&tbl[FSI_LeadSig], 0x41615252);ST_DWORD(&tbl[FSI_StrucSig], 0x61417272);ST_DWORD(&tbl[FSI_Free_Count], n_clust - 1);ST_DWORD(&tbl[FSI_Nxt_Free], 0xFFFFFFFF);disk_write(drv, tbl, b_part+1, 1);disk_write(drv, tbl, b_part+7, 1);}return (disk_ioctl(drv, CTRL_SYNC, NULL) == RES_OK) ? FR_OK : FR_RW_ERROR;}#endif /* _USE_MKFS && !_FS_READONLY */#if _USE_STRFUNC >= 1/*-----------------------------------------------------------------------*//* Get a string from the file *//*-----------------------------------------------------------------------*/char* fgets (char* buff, /* Pointer to the string buffer to read */int len, /* Size of string buffer */FIL* fil /* Pointer to the file object */){int i = 0;char *p = buff;UINT rc;while (i < len - 1) { /* Read bytes until buffer gets filled */f_read(fil, p, 1, &rc);if (rc != 1) break; /* Break when no data to read */#if _USE_STRFUNC >= 2if (*p == '\r') continue; /* Strip '\r' */#endifi++;if (*p++ == '\n') break; /* Break when reached end of line */}*p = 0;return i ? buff : 0; /* When no data read (eof or error), return with error. */}#if !_FS_READONLY#include <stdarg.h>/*-----------------------------------------------------------------------*//* Put a character to the file *//*-----------------------------------------------------------------------*/int fputc (int chr, /* A character to be output */FIL* fil /* Ponter to the file object */){UINT bw;char c;#if _USE_STRFUNC >= 2if (chr == '\n') fputc ('\r', fil); /* LF -> CRLF conversion */#endifif (!fil) { /* Special value may be used to switch the destination to any other device *//* put_console(chr); */return chr;}c = (char)chr;f_write(fil, &c, 1, &bw); /* Write a byte to the file */return bw ? chr : EOF; /* Return the resulut */}/*-----------------------------------------------------------------------*//* Put a string to the file *//*-----------------------------------------------------------------------*/int fputs (const char* str, /* Pointer to the string to be output */FIL* fil /* Pointer to the file object */){int n;for (n = 0; *str; str++, n++) {if (fputc(*str, fil) == EOF) return EOF;}return n;}/*-----------------------------------------------------------------------*//* Put a formatted string to the file *//*-----------------------------------------------------------------------*/int fprintf (FIL* fil, /* Pointer to the file object */const char* str, /* Pointer to the format string */... /* Optional arguments... */){va_list arp;UCHAR c, f, r;ULONG val;char s[16];int i, w, res, cc;va_start(arp, str);for (cc = res = 0; cc != EOF; res += cc) {c = *str++;if (c == 0) break; /* End of string */if (c != '%') { /* Non escape cahracter */cc = fputc(c, fil);if (cc != EOF) cc = 1;continue;}w = f = 0;c = *str++;if (c == '0') { /* Flag: '0' padding */f = 1; c = *str++;}while (c >= '0' && c <= '9') { /* Precision */w = w * 10 + (c - '0');c = *str++;}if (c == 'l') { /* Prefix: Size is long int */f |= 2; c = *str++;}if (c == 's') { /* Type is string */cc = fputs(va_arg(arp, char*), fil);continue;}if (c == 'c') { /* Type is character */cc = fputc(va_arg(arp, char), fil);if (cc != EOF) cc = 1;continue;}r = 0;if (c == 'd') r = 10; /* Type is signed decimal */if (c == 'u') r = 10; /* Type is unsigned decimal */if (c == 'X') r = 16; /* Type is unsigned hexdecimal */if (r == 0) break; /* Unknown type */if (f & 2) { /* Get the value */val = (ULONG)va_arg(arp, long);} else {val = (c == 'd') ? (ULONG)(long)va_arg(arp, int) : (ULONG)va_arg(arp, unsigned int);}/* Put numeral string */if (c == 'd') {if (val >= 0x80000000) {val = 0 - val;f |= 4;}}i = sizeof(s) - 1; s[i] = 0;do {c = (UCHAR)(val % r + '0');if (c > '9') c += 7;s[--i] = c;val /= r;} while (i && val);if (i && (f & 4)) s[--i] = '-';w = sizeof(s) - 1 - w;while (i && i > w) s[--i] = (f & 1) ? '0' : ' ';cc = fputs(&s[i], fil);}va_end(arp);return (cc == EOF) ? cc : res;}#endif /* !_FS_READONLY */#endif /* _USE_STRFUNC >= 1*/