/Designs/DOGFINDER01A/SW/ATMEGA168/tff.c
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 */