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mini/ff.c

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/*----------------------------------------------------------------------------/
/ 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
---------------------------------------------------------------------------*/
static
FATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */
static
WORD fsid; /* File system mount ID */
/*-----------------------------------------------------------------------*/
/* Change window offset */
/*-----------------------------------------------------------------------*/
static
BOOL 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_READONLY
BYTE 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);
}
}
}
#endif
if (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_READONLY
static
FRESULT 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 */
/*-----------------------------------------------------------------------*/
static
DWORD 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_READONLY
static
BOOL 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_READONLY
static
BOOL 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_FSINFO
fs->fsi_flag = 1;
#endif
}
clust = nxt;
}
return TRUE;
}
#endif
/*-----------------------------------------------------------------------*/
/* Stretch or create a cluster chain */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
DWORD 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_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# */
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 */
/*-----------------------------------------------------------------------*/
static
BOOL 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 <= 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 ^= 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 */
/*-----------------------------------------------------------------------*/
static
FRESULT 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_READONLY
static
FRESULT 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 */
/*-----------------------------------------------------------------------*/
static
BYTE 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 */
/*-----------------------------------------------------------------------*/
static
FRESULT 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 */
else
drv = 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_READONLY
if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
return FR_WRITE_PROTECTED;
#endif
return FR_OK; /* The file system object is valid */
}
}
/* The logical drive must be 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_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(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 */
else
fs->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
#endif
fs->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 */
/*-----------------------------------------------------------------------*/
static
FRESULT 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_READONLY
mode &= (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)));
#else
mode &= FA_READ;
res = auto_mount(&path, &dj.fs, 0);
#endif
if (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_READONLY
if ((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;
#endif
fp->flag = mode; /* File access mode */
fp->org_clust = /* File start cluster */
((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);
fp->fsize = LD_DWORD(&dir[DIR_FileSize]); /* File size */
fp->fptr = 0; fp->csect = 255; /* File pointer */
fp->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_READONLY
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 fr_error;
fp->flag &= (BYTE)~FA__DIRTY;
}
#endif
if (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_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 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_READONLY
if (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;
}
#endif
fp->curr_clust = clust;
}
if (clust != 0) {
while (ofs > csize) { /* Cluster following loop */
#if !_FS_READONLY
if (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
#endif
clust = 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_READONLY
if (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;
}
#endif
if (disk_read(fp->fs->drive, fp->buffer, nsect, 1) != RES_OK)
goto fk_error;
fp->curr_sect = nsect;
}
#if !_FS_READONLY
if (fp->fptr > fp->fsize) { /* Set changed flag if the file was extended */
fp->fsize = fp->fptr;
fp->flag |= FA__WRITTEN;
}
#endif
return 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_FSINFO
if (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;
#endif
allocsize /= 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;
else
tbl[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 >= 2
if (*p == '\r') continue; /* Strip '\r' */
#endif
i++;
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 >= 2
if (chr == '\n') fputc ('\r', fil); /* LF -> CRLF conversion */
#endif
if (!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*/
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