/*----------------------------------------------------------------------------/
/ FatFs - FAT file system module R0.08b (C)ChaN, 2011
/-----------------------------------------------------------------------------/
/ FatFs module is a generic FAT file system module for small embedded systems.
/ This is a free software that opened for education, research and commercial
/ developments under license policy of following terms.
/
/ Copyright (C) 2011, ChaN, all right reserved.
/
/ * The FatFs module is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/ personal, non-profit or commercial products 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) partition.
/ 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 algorithm 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 physical 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.
/
/ Apr 01,'09 R0.07 Merged Tiny-FatFs as a configuration option. (_FS_TINY)
/ Added long file name feature.
/ Added multiple code page feature.
/ Added re-entrancy for multitask operation.
/ Added auto cluster size selection to f_mkfs().
/ Added rewind option to f_readdir().
/ Changed result code of critical errors.
/ Renamed string functions to avoid name collision.
/ Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
/ Added multiple sector size feature.
/ Jun 21,'09 R0.07c Fixed f_unlink() can return 0 on error.
/ Fixed wrong cache control in f_lseek().
/ Added relative path feature.
/ Added f_chdir() and f_chdrive().
/ Added proper case conversion to extended char.
/ Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
/ Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH.
/ Fixed name matching error on the 13 char boundary.
/ Added a configuration option, _LFN_UNICODE.
/ Changed f_readdir() to return the SFN with always upper case on non-LFN cfg.
/
/ May 15,'10 R0.08 Added a memory configuration option. (_USE_LFN = 3)
/ Added file lock feature. (_FS_SHARE)
/ Added fast seek feature. (_USE_FASTSEEK)
/ Changed some types on the API, XCHAR->TCHAR.
/ Changed fname member in the FILINFO structure on Unicode cfg.
/ String functions support UTF-8 encoding files on Unicode cfg.
/ Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2)
/ Added sector erase feature. (_USE_ERASE)
/ Moved file lock semaphore table from fs object to the bss.
/ Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
/ Fixed f_mkfs() creates wrong FAT32 volume.
/ Jan 15,'11 R0.08b Fast seek feature is also applied to f_read() and f_write().
/ f_lseek() reports required table size on creating CLMP.
/ Extended format syntax of f_printf function.
/ Ignores duplicated directory separators in given path names.
/---------------------------------------------------------------------------*/
#include <string.h>
#include <errno.h>
#include <malloc.h>
#include <linux/ctype.h>
#include <filetype.h>
#include "ff.h" /* FatFs configurations and declarations */
#include "diskio.h" /* Declarations of low level disk I/O functions */
#if _FATFS != 8237
#error Wrong include file (ff.h).
#endif
/* Definitions on sector size */
#if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
#error Wrong sector size.
#endif
#if _MAX_SS != 512
#define SS(fs) ((fs)->ssize) /* Multiple sector size */
#else
#define SS(fs) 512U /* Fixed sector size */
#endif
#define ABORT(fs, res) { fp->flag |= FA__ERROR; return res; }
/* Misc definitions */
#define LD_CLUST(dir) (((DWORD)LD_WORD(dir+DIR_FstClusHI)<<16) | LD_WORD(dir+DIR_FstClusLO))
#define ST_CLUST(dir,cl) {ST_WORD(dir+DIR_FstClusLO, cl); ST_WORD(dir+DIR_FstClusHI, (DWORD)cl>>16);}
/* DBCS code ranges and SBCS extend char conversion table */
/* Codepage 437 (US OEM) */
#define _DF1S 0
#define _EXCVT { \
0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF, \
}
#define IsDBCS1(c) 0
#define IsDBCS2(c) 0
/* Name status flags */
#define NS 11 /* Index of name status byte in fn[] */
#define NS_LOSS 0x01 /* Out of 8.3 format */
#define NS_LFN 0x02 /* Force to create LFN entry */
#define NS_LAST 0x04 /* Last segment */
#define NS_BODY 0x08 /* Lower case flag (body) */
#define NS_EXT 0x10 /* Lower case flag (ext) */
#define NS_DOT 0x20 /* Dot entry */
/* FAT sub-type boundaries */
/* Note that the FAT spec by Microsoft says 4085 but Windows works with 4087! */
#define MIN_FAT16 4086 /* Minimum number of clusters for FAT16 */
#define MIN_FAT32 65526 /* Minimum number of clusters for FAT32 */
/* FatFs refers the members in the FAT structures as byte array instead of
/ structure member because the structure is not binary compatible between
/ different platforms */
#define BS_jmpBoot 0 /* Jump instruction (3) */
#define BS_OEMName 3 /* OEM name (8) */
#define BPB_BytsPerSec 11 /* Sector size [byte] (2) */
#define BPB_SecPerClus 13 /* Cluster size [sector] (1) */
#define BPB_RsvdSecCnt 14 /* Size of reserved area [sector] (2) */
#define BPB_NumFATs 16 /* Number of FAT copies (1) */
#define BPB_RootEntCnt 17 /* Number of root dir entries for FAT12/16 (2) */
#define BPB_TotSec16 19 /* Volume size [sector] (2) */
#define BPB_Media 21 /* Media descriptor (1) */
#define BPB_FATSz16 22 /* FAT size [sector] (2) */
#define BPB_SecPerTrk 24 /* Track size [sector] (2) */
#define BPB_NumHeads 26 /* Number of heads (2) */
#define BPB_HiddSec 28 /* Number of special hidden sectors (4) */
#define BPB_TotSec32 32 /* Volume size [sector] (4) */
#define BS_DrvNum 36 /* Physical drive number (2) */
#define BS_BootSig 38 /* Extended boot signature (1) */
#define BS_VolID 39 /* Volume serial number (4) */
#define BS_VolLab 43 /* Volume label (8) */
#define BS_FilSysType 54 /* File system type (1) */
#define BPB_FATSz32 36 /* FAT size [sector] (4) */
#define BPB_ExtFlags 40 /* Extended flags (2) */
#define BPB_FSVer 42 /* File system version (2) */
#define BPB_RootClus 44 /* Root dir first cluster (4) */
#define BPB_FSInfo 48 /* Offset of FSInfo sector (2) */
#define BPB_BkBootSec 50 /* Offset of backup boot sectot (2) */
#define BS_DrvNum32 64 /* Physical drive number (2) */
#define BS_BootSig32 66 /* Extended boot signature (1) */
#define BS_VolID32 67 /* Volume serial number (4) */
#define BS_VolLab32 71 /* Volume label (8) */
#define BS_FilSysType32 82 /* File system type (1) */
#define FSI_LeadSig 0 /* FSI: Leading signature (4) */
#define FSI_StrucSig 484 /* FSI: Structure signature (4) */
#define FSI_Free_Count 488 /* FSI: Number of free clusters (4) */
#define FSI_Nxt_Free 492 /* FSI: Last allocated cluster (4) */
#define MBR_Table 446 /* MBR: Partition table offset (2) */
#define SZ_PTE 16 /* MBR: Size of a partition table entry */
#define BS_55AA 510 /* Boot sector signature (2) */
#define DIR_Name 0 /* Short file name (11) */
#define DIR_Attr 11 /* Attribute (1) */
#define DIR_NTres 12 /* NT flag (1) */
#define DIR_CrtTime 14 /* Created time (2) */
#define DIR_CrtDate 16 /* Created date (2) */
#define DIR_FstClusHI 20 /* Higher 16-bit of first cluster (2) */
#define DIR_WrtTime 22 /* Modified time (2) */
#define DIR_WrtDate 24 /* Modified date (2) */
#define DIR_FstClusLO 26 /* Lower 16-bit of first cluster (2) */
#define DIR_FileSize 28 /* File size (4) */
#define LDIR_Ord 0 /* LFN entry order and LLE flag (1) */
#define LDIR_Attr 11 /* LFN attribute (1) */
#define LDIR_Type 12 /* LFN type (1) */
#define LDIR_Chksum 13 /* Sum of corresponding SFN entry */
#define LDIR_FstClusLO 26 /* Filled by zero (0) */
#define SZ_DIR 32 /* Size of a directory entry */
#define LLE 0x40 /* Last long entry flag in LDIR_Ord */
#define DDE 0xE5 /* Deleted directory enrty mark in DIR_Name[0] */
#define NDDE 0x05 /* Replacement of a character collides with DDE */
#ifndef CONFIG_FS_FAT_LFN
#define DEF_NAMEBUF BYTE sfn[12]
#define INIT_BUF(dobj) (dobj).fn = sfn
#define FREE_BUF()
#else
static WCHAR LfnBuf[_MAX_LFN+1];
#define DEF_NAMEBUF BYTE sfn[12]
#define INIT_BUF(dobj) { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define FREE_BUF()
#endif
/*
* Change window offset
*/
struct fat_sector {
DWORD sector;
struct list_head list;
unsigned char data[0];
};
/*-----------------------------------------------------------------------*/
/* Change window offset */
/*-----------------------------------------------------------------------*/
static
int move_window (
FATFS *fs, /* File system object */
DWORD sector /* Sector number to make appearance in the fs->win[] */
) /* Move to zero only writes back dirty window */
{
DWORD wsect;
wsect = fs->winsect;
if (wsect != sector) { /* Changed current window */
#ifdef CONFIG_FS_FAT_WRITE
if (fs->wflag) { /* Write back dirty window if needed */
if (disk_write(fs, fs->win, wsect, 1) != RES_OK)
return -EIO;
fs->wflag = 0;
if (wsect < (fs->fatbase + fs->fsize)) { /* In FAT area */
BYTE nf;
for (nf = fs->n_fats; nf > 1; nf--) { /* Reflect the change to all FAT copies */
wsect += fs->fsize;
disk_write(fs, fs->win, wsect, 1);
}
}
}
#endif
if (sector) {
if (disk_read(fs, fs->win, sector, 1) != RES_OK)
return -EIO;
fs->winsect = sector;
}
}
return 0;
}
/*
* Clean-up cached data
*/
#ifdef CONFIG_FS_FAT_WRITE
static
int sync ( /* 0: successful, -EIO: failed */
FATFS *fs /* File system object */
)
{
int res;
res = move_window(fs, 0);
if (res == 0) {
/* Update FSInfo sector if needed */
if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
fs->winsect = 0;
/* Create FSInfo structure */
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);
/* Write it into the FSInfo sector */
disk_write(fs, fs->win, fs->fsi_sector, 1);
fs->fsi_flag = 0;
}
/* Make sure that no pending write process in the physical drive */
if (disk_ioctl(fs, CTRL_SYNC, (void*)0) != RES_OK)
res = -EIO;
}
return res;
}
#endif
/*
* Get sector# from cluster#
*/
static DWORD clust2sect ( /* !=0: Sector number, 0: Failed - invalid cluster# */
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to be converted */
)
{
clst -= 2;
if (clst >= (fs->n_fatent - 2))
return 0; /* Invalid cluster */
return clst * fs->csize + fs->database;
}
/*
* FAT access - Read value of a FAT entry
*/
static DWORD get_fat ( /* 0xFFFFFFFF:Disk error, 1:Internal error, Else:Cluster status */
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to get the link information */
)
{
UINT wc, bc;
BYTE *p;
if (clst < 2 || clst >= fs->n_fatent) /* Chack range */
return 1;
switch (fs->fs_type) {
case FS_FAT12 :
bc = (UINT)clst; bc += bc / 2;
if (move_window(fs, fs->fatbase + (bc / SS(fs))))
break;
wc = fs->win[bc % SS(fs)]; bc++;
if (move_window(fs, fs->fatbase + (bc / SS(fs))))
break;
wc |= fs->win[bc % SS(fs)] << 8;
return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
case FS_FAT16 :
if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))))
break;
p = &fs->win[clst * 2 % SS(fs)];
return LD_WORD(p);
case FS_FAT32 :
if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))))
break;
p = &fs->win[clst * 4 % SS(fs)];
return LD_DWORD(p) & 0x0FFFFFFF;
}
return 0xFFFFFFFF; /* An error occurred at the disk I/O layer */
}
/*
* FAT access - Change value of a FAT entry
*/
#ifdef CONFIG_FS_FAT_WRITE
static int put_fat (
FATFS *fs, /* File system object */
DWORD clst, /* Cluster# to be changed in range of 2 to fs->n_fatent - 1 */
DWORD val /* New value to mark the cluster */
)
{
UINT bc;
BYTE *p;
int res;
if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
res = -ERESTARTSYS;
} else {
switch (fs->fs_type) {
case FS_FAT12 :
bc = clst; bc += bc / 2;
res = move_window(fs, fs->fatbase + (bc / SS(fs)));
if (res != 0)
break;
p = &fs->win[bc % SS(fs)];
*p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
bc++;
fs->wflag = 1;
res = move_window(fs, fs->fatbase + (bc / SS(fs)));
if (res != 0)
break;
p = &fs->win[bc % SS(fs)];
*p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
break;
case FS_FAT16 :
res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
if (res != 0)
break;
p = &fs->win[clst * 2 % SS(fs)];
ST_WORD(p, (WORD)val);
break;
case FS_FAT32 :
res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
if (res != 0)
break;
p = &fs->win[clst * 4 % SS(fs)];
val |= LD_DWORD(p) & 0xF0000000;
ST_DWORD(p, val);
break;
default :
res = -ERESTARTSYS;
}
fs->wflag = 1;
}
return res;
}
#endif /* CONFIG_FS_FAT_WRITE */
/*
* FAT handling - Remove a cluster chain
*/
#ifdef CONFIG_FS_FAT_WRITE
static
int remove_chain (
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to remove a chain from */
)
{
int res;
DWORD nxt;
#if _USE_ERASE
DWORD scl = clst, ecl = clst, resion[2];
#endif
if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
res = -ERESTARTSYS;
} else {
res = 0;
while (clst < fs->n_fatent) { /* Not a last link? */
nxt = get_fat(fs, clst); /* Get cluster status */
if (nxt == 0)
break; /* Empty cluster? */
if (nxt == 1) {
res = -ERESTARTSYS;
break; /* Internal error? */
}
if (nxt == 0xFFFFFFFF) {
res = -EIO;
break; /* Disk error? */
}
/* Mark the cluster "empty" */
res = put_fat(fs, clst, 0);
if (res != 0)
break;
if (fs->free_clust != 0xFFFFFFFF) { /* Update FSInfo */
fs->free_clust++;
fs->fsi_flag = 1;
}
#if _USE_ERASE
if (ecl + 1 == nxt) { /* Next cluster is contiguous */
ecl = nxt;
} else {
/* End of contiguous clusters */
resion[0] = clust2sect(fs, scl); /* Start sector */
resion[1] = clust2sect(fs, ecl) + fs->csize - 1; /* End sector */
disk_ioctl(fs, CTRL_ERASE_SECTOR, resion); /* Erase the block */
scl = ecl = nxt;
}
#endif
clst = nxt; /* Next cluster */
}
}
return res;
}
#endif
/*
* FAT handling - Stretch or Create a cluster chain
*/
#ifdef CONFIG_FS_FAT_WRITE
static
DWORD create_chain ( /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to stretch. 0 means create a new chain. */
)
{
DWORD cs, ncl, scl;
int res;
if (clst == 0) {
/* Create a new chain */
scl = fs->last_clust; /* Get suggested start point */
if (!scl || scl >= fs->n_fatent) scl = 1;
} else {
/* Stretch the current chain */
cs = get_fat(fs, clst); /* Check the cluster status */
if (cs < 2)
return 1; /* It is an invalid cluster */
if (cs < fs->n_fatent)
return cs; /* It is already followed by next cluster */
scl = clst;
}
ncl = scl; /* Start cluster */
for (;;) {
ncl++; /* Next cluster */
if (ncl >= fs->n_fatent) { /* Wrap around */
ncl = 2;
if (ncl > scl)
return 0; /* No free cluster */
}
cs = get_fat(fs, ncl); /* Get the cluster status */
if (cs == 0)
break; /* Found a free cluster */
if (cs == 0xFFFFFFFF || cs == 1)/* An error occurred */
return cs;
if (ncl == scl)
return 0; /* No free cluster */
}
/* Mark the new cluster "last link" */
res = put_fat(fs, ncl, 0x0FFFFFFF);
if (res == 0 && clst != 0) {
res = put_fat(fs, clst, ncl); /* Link it to the previous one if needed */
}
if (res == 0) {
/* Update FSINFO */
fs->last_clust = ncl;
if (fs->free_clust != 0xFFFFFFFF) {
fs->free_clust--;
fs->fsi_flag = 1;
}
} else {
ncl = (res == -EIO) ? 0xFFFFFFFF : 1;
}
return ncl; /* Return new cluster number or error code */
}
#endif /* CONFIG_FS_FAT_WRITE */
/*
* Directory handling - Set directory index
*/
static int dir_sdi (
FF_DIR *dj, /* Pointer to directory object */
WORD idx /* Directory index number */
)
{
DWORD clst;
WORD ic;
dj->index = idx;
clst = dj->sclust;
if (clst == 1 || clst >= dj->fs->n_fatent) /* Check start cluster range */
return -ERESTARTSYS;
if (!clst && dj->fs->fs_type == FS_FAT32) /* Replace cluster# 0 with root cluster# if in FAT32 */
clst = dj->fs->dirbase;
if (clst == 0) {
/* Static table (root-dir in FAT12/16) */
dj->clust = clst;
if (idx >= dj->fs->n_rootdir)
/* Index is out of range */
return -ERESTARTSYS;
dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / SZ_DIR); /* Sector# */
} else {
/* Dynamic table (sub-dirs or root-dir in FAT32) */
ic = SS(dj->fs) / SZ_DIR * dj->fs->csize; /* Entries per cluster */
while (idx >= ic) { /* Follow cluster chain */
clst = get_fat(dj->fs, clst); /* Get next cluster */
if (clst == 0xFFFFFFFF)
return -EIO; /* Disk error */
if (clst < 2 || clst >= dj->fs->n_fatent)
/* Reached to end of table or int error */
return -ERESTARTSYS;
idx -= ic;
}
dj->clust = clst;
dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / SZ_DIR); /* Sector# */
}
dj->dir = dj->fs->win + (idx % (SS(dj->fs) / SZ_DIR)) * SZ_DIR; /* Ptr to the entry in the sector */
return 0; /* Seek succeeded */
}
/*
* Directory handling - Move directory index next
*/
static int dir_next ( /* 0:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not stretch */
FF_DIR *dj, /* Pointer to directory object */
int stretch /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
DWORD clst;
WORD i;
i = dj->index + 1;
if (!i || !dj->sect) /* Report EOT when index has reached 65535 */
return -ENOENT;
if (!(i % (SS(dj->fs) / SZ_DIR))) { /* Sector changed? */
dj->sect++; /* Next sector */
if (dj->clust == 0) {
/* Static table */
if (i >= dj->fs->n_rootdir) /* Report EOT when end of table */
return -ENOENT;
}
else {
/* Dynamic table */
if (((i / (SS(dj->fs) / SZ_DIR)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */
clst = get_fat(dj->fs, dj->clust); /* Get next cluster */
if (clst <= 1)
return -ERESTARTSYS;
if (clst == 0xFFFFFFFF)
return -EIO;
if (clst >= dj->fs->n_fatent) { /* When it reached end of dynamic table */
#ifdef CONFIG_FS_FAT_WRITE
BYTE c;
if (!stretch)
return -ENOENT; /* When do not stretch, report EOT */
clst = create_chain(dj->fs, dj->clust); /* Stretch cluster chain */
if (clst == 0)
return -ENOSPC; /* No free cluster */
if (clst == 1)
return -ERESTARTSYS;
if (clst == 0xFFFFFFFF)
return -EIO;
/* Clean-up stretched table */
if (move_window(dj->fs, 0))
return -EIO; /* Flush active window */
memset(dj->fs->win, 0, SS(dj->fs)); /* Clear window buffer */
dj->fs->winsect = clust2sect(dj->fs, clst); /* Cluster start sector */
for (c = 0; c < dj->fs->csize; c++) {
/* Fill the new cluster with 0 */
dj->fs->wflag = 1;
if (move_window(dj->fs, 0))
return -EIO;
dj->fs->winsect++;
}
dj->fs->winsect -= c; /* Rewind window address */
#else
return -ENOENT; /* Report EOT */
#endif
}
dj->clust = clst; /* Initialize data for new cluster */
dj->sect = clust2sect(dj->fs, clst);
}
}
}
dj->index = i;
dj->dir = dj->fs->win + (i % (SS(dj->fs) / SZ_DIR)) * SZ_DIR;
return 0;
}
/*
* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry
*/
#ifdef CONFIG_FS_FAT_LFN
/* Offset of LFN chars in the directory entry */
static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};
static int cmp_lfn ( /* 1:Matched, 0:Not matched */
WCHAR *lfnbuf, /* Pointer to the LFN to be compared */
BYTE *dir /* Pointer to the directory entry containing a part of LFN */
)
{
UINT i, s;
WCHAR wc, uc;
/* Get offset in the LFN buffer */
i = ((dir[LDIR_Ord] & ~LLE) - 1) * 13;
s = 0; wc = 1;
do {
/* Pick an LFN character from the entry */
uc = LD_WORD(dir+LfnOfs[s]);
if (wc) {
/* Last char has not been processed */
wc = ff_wtoupper(uc);
if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++])) /* Compare it */
return 0; /* Not matched */
} else {
if (uc != 0xFFFF) return 0; /* Check filler */
}
} while (++s < 13); /* Repeat until all chars in the entry are checked */
if ((dir[LDIR_Ord] & LLE) && wc && lfnbuf[i])
/* Last segment matched but different length */
return 0;
return 1; /* The part of LFN matched */
}
static
int pick_lfn ( /* 1:Succeeded, 0:Buffer overflow */
WCHAR *lfnbuf, /* Pointer to the Unicode-LFN buffer */
BYTE *dir /* Pointer to the directory entry */
)
{
UINT i, s;
WCHAR wc, uc;
i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13; /* Offset in the LFN buffer */
s = 0;
wc = 1;
do {
/* Pick an LFN character from the entry */
uc = LD_WORD(dir+LfnOfs[s]);
if (wc) {
/* Last char has not been processed */
if (i >= _MAX_LFN)
return 0; /* Buffer overflow? */
lfnbuf[i++] = wc = uc; /* Store it */
} else {
if (uc != 0xFFFF)
return 0; /* Check filler */
}
} while (++s < 13); /* Read all character in the entry */
if (dir[LDIR_Ord] & LLE) {
/* Put terminator if it is the last LFN part */
if (i >= _MAX_LFN)
return 0; /* Buffer overflow? */
lfnbuf[i] = 0;
}
return 1;
}
#ifdef CONFIG_FS_FAT_WRITE
static
void fit_lfn (
const WCHAR *lfnbuf, /* Pointer to the LFN buffer */
BYTE *dir, /* Pointer to the directory entry */
BYTE ord, /* LFN order (1-20) */
BYTE sum /* SFN sum */
)
{
UINT i, s;
WCHAR wc;
dir[LDIR_Chksum] = sum; /* Set check sum */
dir[LDIR_Attr] = AM_LFN; /* Set attribute. LFN entry */
dir[LDIR_Type] = 0;
ST_WORD(dir+LDIR_FstClusLO, 0);
i = (ord - 1) * 13; /* Get offset in the LFN buffer */
s = wc = 0;
do {
if (wc != 0xFFFF)
wc = lfnbuf[i++]; /* Get an effective char */
ST_WORD(dir + LfnOfs[s], wc); /* Put it */
if (!wc)
wc = 0xFFFF; /* Padding chars following last char */
} while (++s < 13);
if (wc == 0xFFFF || !lfnbuf[i])
ord |= LLE; /* Bottom LFN part is the start of LFN sequence */
dir[LDIR_Ord] = ord; /* Set the LFN order */
}
#endif
#endif
/*
* Create numbered name
*/
#if defined(CONFIG_FS_FAT_LFN) && defined(CONFIG_FS_FAT_WRITE)
static void gen_numname (
BYTE *dst, /* Pointer to generated SFN */
const BYTE *src, /* Pointer to source SFN to be modified */
const WCHAR *lfn, /* Pointer to LFN */
WORD seq /* Sequence number */
)
{
BYTE ns[8], c;
UINT i, j;
memcpy(dst, src, 11);
if (seq > 5) { /* On many collisions, generate a hash number instead of sequential number */
do {
seq = (seq >> 1) + (seq << 15) + (WORD) * lfn++;
} while (*lfn);
}
/* itoa (hexdecimal) */
i = 7;
do {
c = (seq % 16) + '0';
if (c > '9')
c += 7;
ns[i--] = c;
seq /= 16;
} while (seq);
ns[i] = '~';
/* Append the number */
for (j = 0; j < i && dst[j] != ' '; j++) {
if (IsDBCS1(dst[j])) {
if (j == i - 1)
break;
j++;
}
}
do {
dst[j++] = (i < 8) ? ns[i++] : ' ';
} while (j < 8);
}
#endif
/*
* Calculate sum of an SFN
*/
#ifdef CONFIG_FS_FAT_LFN
static BYTE sum_sfn (
const BYTE *dir /* Ptr to directory entry */
)
{
BYTE sum = 0;
UINT n = 11;
do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
return sum;
}
#endif
/*
* Directory handling - Find an object in the directory
*/
static int dir_find (
FF_DIR *dj /* Pointer to the directory object linked to the file name */
)
{
int res;
BYTE c, *dir;
#ifdef CONFIG_FS_FAT_LFN
BYTE a, ord, sum;
#endif
res = dir_sdi(dj, 0); /* Rewind directory object */
if (res != 0)
return res;
#ifdef CONFIG_FS_FAT_LFN
ord = sum = 0xFF;
#endif
do {
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
dir = dj->dir; /* Ptr to the directory entry of current index */
c = dir[DIR_Name];
if (c == 0) {
/* Reached to end of table */
res = -ENOENT;
break;
}
#ifdef CONFIG_FS_FAT_LFN /* LFN configuration */
a = dir[DIR_Attr] & AM_MASK;
if (c == DDE || ((a & AM_VOL) && a != AM_LFN)) {
/* An entry without valid data */
ord = 0xFF;
} else {
if (a == AM_LFN) {
/* An LFN entry is found */
if (dj->lfn) {
if (c & LLE) { /* Is it start of LFN sequence? */
sum = dir[LDIR_Chksum];
c &= ~LLE; ord = c; /* LFN start order */
dj->lfn_idx = dj->index;
}
/* Check validity of the LFN entry and compare it with given name */
ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
}
} else {
/* An SFN entry is found */
if (!ord && sum == sum_sfn(dir))
break; /* LFN matched? */
/* Reset LFN sequence */
ord = 0xFF;
dj->lfn_idx = 0xFFFF;
if (!(dj->fn[NS] & NS_LOSS) && !memcmp(dir, dj->fn, 11))
break; /* SFN matched? */
}
}
#else /* Non LFN configuration */
if (!(dir[DIR_Attr] & AM_VOL) && !memcmp(dir, dj->fn, 11)) /* Is it a valid entry? */
break;
#endif
res = dir_next(dj, 0); /* Next entry */
} while (res == 0);
return res;
}
/*
* Read an object from the directory
*/
static int dir_read (
FF_DIR *dj /* Pointer to the directory object that pointing the entry to be read */
)
{
int res;
BYTE c, *dir;
#ifdef CONFIG_FS_FAT_LFN
BYTE a, ord = 0xFF, sum = 0xFF;
#endif
res = -ENOENT;
while (dj->sect) {
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
dir = dj->dir; /* Ptr to the directory entry of current index */
c = dir[DIR_Name];
if (c == 0) {
/* Reached to end of table */
res = -ENOENT;
break;
}
#ifdef CONFIG_FS_FAT_LFN /* LFN configuration */
a = dir[DIR_Attr] & AM_MASK;
if (c == DDE || c == '.' || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
ord = 0xFF;
} else {
if (a == AM_LFN) {
/* An LFN entry is found */
if (c & LLE) { /* Is it start of LFN sequence? */
sum = dir[LDIR_Chksum];
c &= ~LLE; ord = c;
dj->lfn_idx = dj->index;
}
/* Check LFN validity and capture it */
ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
} else {
/* An SFN entry is found */
if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
dj->lfn_idx = 0xFFFF; /* It has no LFN. */
break;
}
}
#else /* Non LFN configuration */
if (c != DDE && c != '.' && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */
break;
#endif
res = dir_next(dj, 0); /* Next entry */
if (res != 0)
break;
}
if (res != 0)
dj->sect = 0;
return res;
}
/*
* Register an object to the directory
*/
#ifdef CONFIG_FS_FAT_WRITE
static
int dir_register ( /* 0:Successful, FR_DENIED:No free entry or too many SFN collision, -EIO:Disk error */
FF_DIR *dj /* Target directory with object name to be created */
)
{
int res;
BYTE c, *dir;
#ifdef CONFIG_FS_FAT_LFN /* LFN configuration */
WORD n, ne, is;
BYTE sn[12], *fn, sum;
WCHAR *lfn;
fn = dj->fn; lfn = dj->lfn;
memcpy(sn, fn, 12);
if (sn[NS] & NS_LOSS) {
/* When LFN is out of 8.3 format, generate a numbered name */
fn[NS] = 0; dj->lfn = NULL; /* Find only SFN */
for (n = 1; n < 100; n++) {
gen_numname(fn, sn, lfn, n); /* Generate a numbered name */
res = dir_find(dj); /* Check if the name collides with existing SFN */
if (res != 0)
break;
}
if (n == 100)
return -ENOSPC; /* Abort if too many collisions */
if (res != -ENOENT)
return res; /* Abort if the result is other than 'not collided' */
fn[NS] = sn[NS]; dj->lfn = lfn;
}
if (sn[NS] & NS_LFN) {
/* When LFN is to be created, reserve an SFN + LFN entries. */
for (ne = 0; lfn[ne]; ne++);
ne = (ne + 25) / 13;
} else {
/* Otherwise reserve only an SFN entry. */
ne = 1;
}
/* Reserve contiguous entries */
res = dir_sdi(dj, 0);
if (res != 0)
return res;
n = is = 0;
do {
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
c = *dj->dir; /* Check the entry status */
if (c == DDE || c == 0) { /* Is it a blank entry? */
if (n == 0)
is = dj->index; /* First index of the contiguous entry */
if (++n == ne)
break; /* A contiguous entry that required count is found */
} else {
n = 0; /* Not a blank entry. Restart to search */
}
res = dir_next(dj, 1); /* Next entry with table stretch */
} while (res == 0);
if (res == 0 && ne > 1) {
/* Initialize LFN entry if needed */
res = dir_sdi(dj, is);
if (res == 0) {
sum = sum_sfn(dj->fn); /* Sum of the SFN tied to the LFN */
ne--;
do {
/* Store LFN entries in bottom first */
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum);
dj->fs->wflag = 1;
res = dir_next(dj, 0); /* Next entry */
} while (res == 0 && --ne);
}
}
#else /* Non LFN configuration */
res = dir_sdi(dj, 0);
if (res == 0) {
do { /* Find a blank entry for the SFN */
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
c = *dj->dir;
if (c == DDE || c == 0)
break; /* Is it a blank entry? */
res = dir_next(dj, 1); /* Next entry with table stretch */
} while (res == 0);
}
#endif
if (res == 0) { /* Initialize the SFN entry */
res = move_window(dj->fs, dj->sect);
if (res == 0) {
dir = dj->dir;
memset(dir, 0, SZ_DIR); /* Clean the entry */
memcpy(dir, dj->fn, 11); /* Put SFN */
#ifdef CONFIG_FS_FAT_LFN
dir[DIR_NTres] = *(dj->fn+NS) & (NS_BODY | NS_EXT); /* Put NT flag */
#endif
dj->fs->wflag = 1;
}
}
return res;
}
#endif /* CONFIG_FS_FAT_WRITE */
/*
* Remove an object from the directory
*/
#if defined CONFIG_FS_FAT_WRITE
static int dir_remove ( /* 0: Successful, -EIO: A disk error */
FF_DIR *dj /* Directory object pointing the entry to be removed */
)
{
int res;
#ifdef CONFIG_FS_FAT_LFN /* LFN configuration */
WORD i;
i = dj->index; /* SFN index */
/* Goto the SFN or top of the LFN entries */
res = dir_sdi(dj, (WORD)((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx));
if (res == 0) {
do {
res = move_window(dj->fs, dj->sect);
if (res != 0)
break;
*dj->dir = DDE; /* Mark the entry "deleted" */
dj->fs->wflag = 1;
if (dj->index >= i)
break; /* When reached SFN, all entries of the object has been deleted. */
res = dir_next(dj, 0); /* Next entry */
} while (res == 0);
if (res == -ENOENT)
res = -ERESTARTSYS;
}
#else /* Non LFN configuration */
res = dir_sdi(dj, dj->index);
if (res == 0) {
res = move_window(dj->fs, dj->sect);
if (res == 0) {
*dj->dir = DDE; /* Mark the entry "deleted" */
dj->fs->wflag = 1;
}
}
#endif
return res;
}
#endif /* CONFIG_FS_FAT_WRITE */
/*
* Pick a segment and create the object name in directory form
*/
static int create_name (
FF_DIR *dj, /* Pointer to the directory object */
const TCHAR **path /* Pointer to pointer to the segment in the path string */
)
{
#ifdef _EXCVT
static const BYTE excvt[] = _EXCVT; /* Upper conversion table for extended chars */
#endif
#ifdef CONFIG_FS_FAT_LFN /* LFN configuration */
BYTE b, cf;
WCHAR w, *lfn;
UINT i, ni, si, di;
const TCHAR *p;
/* Create LFN in Unicode */
for (p = *path; *p == '/' || *p == '\\'; p++) ; /* Strip duplicated separator */
lfn = dj->lfn;
si = di = 0;
for (;;) {
w = p[si++]; /* Get a character */
if (w < ' ' || w == '/' || w == '\\')
break; /* Break on end of segment */
if (di >= _MAX_LFN) /* Reject too long name */
return -ENAMETOOLONG;
#if !_LFN_UNICODE
w &= 0xFF;
if (IsDBCS1(w)) { /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
b = (BYTE)p[si++]; /* Get 2nd byte */
if (!IsDBCS2(b))
return -ENAMETOOLONG; /* Reject invalid sequence */
w = (w << 8) + b; /* Create a DBC */
}
w = ff_convert(w, 1); /* Convert ANSI/OEM to Unicode */
if (!w) return -ENAMETOOLONG; /* Reject invalid code */
#endif
if (w < 0x80 && strchr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */
return -ENAMETOOLONG;
lfn[di++] = w; /* Store the Unicode char */
}
*path = &p[si]; /* Return pointer to the next segment */
cf = (w < ' ') ? NS_LAST : 0; /* Set last segment flag if end of path */
while (di) { /* Strip trailing spaces and dots */
w = lfn[di-1];
if (w != ' ' && w != '.')
break;
di--;
}
if (!di) return -EINVAL; /* Reject nul string */
lfn[di] = 0; /* LFN is created */
/* Create SFN in directory form */
memset(dj->fn, ' ', 11);
for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ; /* Strip leading spaces and dots */
if (si) cf |= NS_LOSS | NS_LFN;
while (di && lfn[di - 1] != '.') di--; /* Find extension (di<=si: no extension) */
b = i = 0; ni = 8;
for (;;) {
w = lfn[si++]; /* Get an LFN char */
if (!w)
break; /* Break on end of the LFN */
if (w == ' ' || (w == '.' && si != di)) { /* Remove spaces and dots */
cf |= NS_LOSS | NS_LFN;
continue;
}
if (i >= ni || si == di) { /* Extension or end of SFN */
if (ni == 11) { /* Long extension */
cf |= NS_LOSS | NS_LFN;
break;
}
if (si != di)
cf |= NS_LOSS | NS_LFN; /* Out of 8.3 format */
if (si > di)
break; /* No extension */
si = di; i = 8; ni = 11;/* Enter extension section */
b <<= 2;
continue;
}
if (w >= 0x80) { /* Non ASCII char */
#ifdef _EXCVT
w = ff_convert(w, 0); /* Unicode -> OEM code */
if (w)
w = excvt[w - 0x80]; /* Convert extended char to upper (SBCS) */
#else
w = ff_convert(ff_wtoupper(w), 0); /* Upper converted Unicode -> OEM code */
#endif
cf |= NS_LFN; /* Force create LFN entry */
}
if (_DF1S && w >= 0x100) { /* Double byte char (always false on SBCS cfg) */
if (i >= ni - 1) {
cf |= NS_LOSS | NS_LFN; i = ni;
continue;
}
dj->fn[i++] = (BYTE)(w >> 8);
} else { /* Single byte char */
if (!w || strchr("+,;=[]", w)) { /* Replace illegal chars for SFN */
w = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
} else {
if (isupper(w)) {
b |= 2;
} else {
if (islower(w)) {
b |= 1; w -= 0x20;
}
}
}
}
dj->fn[i++] = (BYTE)w;
}
if (dj->fn[0] == DDE)
dj->fn[0] = NDDE; /* If the first char collides with deleted mark, replace it with 0x05 */
if (ni == 8) b <<= 2;
if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) /* Create LFN entry when there are composite capitals */
cf |= NS_LFN;
if (!(cf & NS_LFN)) { /* When LFN is in 8.3 format without extended char, NT flags are created */
if ((b & 0x03) == 0x01)
cf |= NS_EXT; /* NT flag (Extension has only small capital) */
if ((b & 0x0C) == 0x04)
cf |= NS_BODY; /* NT flag (Filename has only small capital) */
}
dj->fn[NS] = cf; /* SFN is created */
return 0;
#else /* Non-LFN configuration */
BYTE b, c, d, *sfn;
UINT ni, si, i;
const char *p;
/* Create file name in directory form */
for (p = *path; *p == '/' || *p == '\\'; p++); /* Strip duplicated separator */
sfn = dj->fn;
memset(sfn, ' ', 11);
si = i = b = 0; ni = 8;
for (;;) {
c = (BYTE)p[si++];
if (c <= ' ' || c == '/' || c == '\\') break; /* Break on end of segment */
if (c == '.' || i >= ni) {
if (ni != 8 || c != '.')
return -EINVAL;
i = 8; ni = 11;
b <<= 2; continue;
}
if (c >= 0x80) { /* Extended char? */
b |= 3; /* Eliminate NT flag */
#ifdef _EXCVT
c = excvt[c-0x80]; /* Upper conversion (SBCS) */
#else
#if !_DF1S /* ASCII only cfg */
return -EINVAL;
#endif
#endif
}
if (IsDBCS1(c)) { /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
d = (BYTE)p[si++]; /* Get 2nd byte */
if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */
return -EINVAL;
sfn[i++] = c;
sfn[i++] = d;
} else { /* Single byte code */
if (strchr("\"*+,:;<=>\?[]|\x7F", c)) /* Reject illegal chrs for SFN */
return -EINVAL;
if (isupper(c)) {
b |= 2;
} else {
if (islower(c)) {
b |= 1; c -= 0x20;
}
}
sfn[i++] = c;
}
}
*path = &p[si]; /* Return pointer to the next segment */
c = (c <= ' ') ? NS_LAST : 0; /* Set last segment flag if end of path */
if (!i)
return -EINVAL; /* Reject nul string */
if (sfn[0] == DDE)
sfn[0] = NDDE; /* When first char collides with DDE, replace it with 0x05 */
if (ni == 8)
b <<= 2;
if ((b & 0x03) == 0x01)
c |= NS_EXT; /* NT flag (Name extension has only small capital) */
if ((b & 0x0C) == 0x04)
c |= NS_BODY; /* NT flag (Name body has only small capital) */
sfn[NS] = c; /* Store NT flag, File name is created */
return 0;
#endif
}
/*
* Get file information from directory entry
*/
static void get_fileinfo ( /* No return code */
FF_DIR *dj, /* Pointer to the directory object */
FILINFO *fno /* Pointer to the file information to be filled */
)
{
UINT i;
BYTE nt, *dir;
TCHAR *p, c;
p = fno->fname;
if (dj->sect) {
dir = dj->dir;
nt = dir[DIR_NTres]; /* NT flag */
for (i = 0; i < 8; i++) { /* Copy name body */
c = dir[i];
if (c == ' ')
break;
if (c == NDDE)
c = (TCHAR)DDE;
#ifdef CONFIG_FS_FAT_LFN
if ((nt & NS_BODY) && isupper(c))
c += 0x20;
#endif
#if _LFN_UNICODE
if (IsDBCS1(c) && i < 7 && IsDBCS2(dir[i+1]))
c = (c << 8) | dir[++i];
c = ff_convert(c, 1);
if (!c) c = '?';
#endif
*p++ = c;
}
if (dir[8] != ' ') { /* Copy name extension */
*p++ = '.';
for (i = 8; i < 11; i++) {
c = dir[i];
if (c == ' ')
break;
#ifdef CONFIG_FS_FAT_LFN
if ((nt & NS_EXT) && isupper(c))
c += 0x20;
#endif
#if _LFN_UNICODE
if (IsDBCS1(c) && i < 10 && IsDBCS2(dir[i+1]))
c = (c << 8) | dir[++i];
c = ff_convert(c, 1);
if (!c)
c = '?';
#endif
*p++ = c;
}
}
fno->fattrib = dir[DIR_Attr]; /* Attribute */
fno->fsize = LD_DWORD(dir+DIR_FileSize); /* Size */
fno->fdate = LD_WORD(dir+DIR_WrtDate); /* Date */
fno->ftime = LD_WORD(dir+DIR_WrtTime); /* Time */
}
*p = 0; /* Terminate SFN str by a \0 */
#ifdef CONFIG_FS_FAT_LFN
if (fno->lfname && fno->lfsize) {
TCHAR *tp = fno->lfname;
WCHAR w, *lfn;
i = 0;
if (dj->sect && dj->lfn_idx != 0xFFFF) {/* Get LFN if available */
lfn = dj->lfn;
while ((w = *lfn++) != 0) { /* Get an LFN char */
#if !_LFN_UNICODE
w = ff_convert(w, 0); /* Unicode -> OEM conversion */
if (!w) {
/* Could not convert, no LFN */
i = 0;
break;
}
/* Put 1st byte if it is a DBC (always false on SBCS cfg) */
if (_DF1S && w >= 0x100)
tp[i++] = (TCHAR)(w >> 8);
#endif
if (i >= fno->lfsize - 1) { i = 0; break; } /* Buffer overflow, no LFN */
tp[i++] = (TCHAR)w;
}
}
tp[i] = 0; /* Terminate the LFN str by a \0 */
}
#endif
}
/*
* Follow a file path
*/
static
int follow_path ( /* 0(0): successful, !=0: error code */
FF_DIR *dj, /* Directory object to return last directory and found object */
const TCHAR *path /* Full-path string to find a file or directory */
)
{
int res;
BYTE *dir, ns;
if (*path == '/' || *path == '\\') /* Strip heading separator if exist */
path++;
dj->sclust = 0; /* Start from the root dir */
if ((UINT)*path < ' ') {
/* Nul path means the start directory itself */
res = dir_sdi(dj, 0);
dj->dir = NULL;
return res;
}
/* Follow path */
for (;;) {
res = create_name(dj, &path); /* Get a segment */
if (res != 0)
break;
res = dir_find(dj); /* Find it */
ns = *(dj->fn+NS);
if (res != 0) { /* Failed to find the object */
if (res != -ENOENT)
break; /* Abort if any hard error occured */
/* Object not found */
if (!(ns & NS_LAST))
res = -ENOENT;
break;
}
if (ns & NS_LAST)
break; /* Last segment match. Function completed. */
dir = dj->dir; /* There is next segment. Follow the sub directory */
if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
res = -ENOTDIR;
break;
}
dj->sclust = LD_CLUST(dir);
}
return res;
}
/*
* Load boot record and check if it is an FAT boot record
*/
static enum filetype check_fs ( /* 0:The FAT BR, 1:Valid BR but not an FAT, 2:Not a BR, 3:Disk error */
FATFS *fs, /* File system object */
DWORD sect, /* Sector# (lba) to check if it is an FAT boot record or not */
DWORD *bootsec
)
{
enum filetype ret;
/* Load boot record */
ret = disk_read(fs, fs->win, sect, 1);
if (ret)
return filetype_unknown;
return is_fat_or_mbr(fs->win, bootsec);
}
/*
* Check if the file system object is valid or not
*/
static int chk_mounted ( /* 0(0): successful, !=0: any error occurred */
FATFS *fs, /* Pointer to pointer to the found file system object */
BYTE chk_wp /* !=0: Check media write protection for write access */
)
{
BYTE fmt, b;
DWORD first_boot_sect;
DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
WORD nrsv;
enum filetype type;
INIT_LIST_HEAD(&fs->dirtylist);
/* The logical drive must be mounted. */
/* Following code attempts to mount a volume. (analyze BPB and initialize the fs object) */
fs->fs_type = 0; /* Clear the file system object */
#if _MAX_SS != 512 /* Get disk sector size (variable sector size cfg only) */
if (disk_ioctl(fs, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
return -EIO;
#endif
/* Search FAT partition on the drive. Supports only generic partitionings, FDISK and SFD. */
type = check_fs(fs, bsect = 0, &first_boot_sect); /* Check sector 0 if it is a VBR */
if (type == filetype_mbr) {
/* Sector 0 is an MBR, now check for FAT in the first partition */
type = check_fs(fs, bsect = first_boot_sect, NULL);
if (type != filetype_fat)
return -ENODEV;
}
if (type == filetype_unknown)
return -ENODEV;
/* Following code initializes the file system object */
/* (BPB_BytsPerSec must be equal to the physical sector size) */
if (LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs))
return -EINVAL;
/* Number of sectors per FAT */
fmt = FS_FAT12;
fasize = LD_WORD(fs->win+BPB_FATSz16);
if (!fasize) {
fasize = LD_DWORD(fs->win+BPB_FATSz32);
if (fasize)
/* Must be FAT32 */
fmt = FS_FAT32;
}
fs->fsize = fasize;
/* Number of FAT copies */
fs->n_fats = b = fs->win[BPB_NumFATs];
if (b != 1 && b != 2)
return -EINVAL; /* (Must be 1 or 2) */
/* Number of sectors for FAT area */
fasize *= b;
/* Number of sectors per cluster */
fs->csize = b = fs->win[BPB_SecPerClus];
if (!b || (b & (b - 1)))
return -EINVAL; /* (Must be power of 2) */
/* Number of root directory entries */
fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt);
if (fs->n_rootdir % (SS(fs) / SZ_DIR))
return -EINVAL; /* (BPB_RootEntCnt must be sector aligned) */
/* Number of sectors on the volume */
tsect = LD_WORD(fs->win+BPB_TotSec16);
if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32);
/* Number of reserved sectors */
nrsv = LD_WORD(fs->win+BPB_RsvdSecCnt);
if (!nrsv)
return -EINVAL; /* (BPB_RsvdSecCnt must not be 0) */
/* Determine the FAT sub type */
/* RSV+FAT+FF_DIR */
sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZ_DIR);
if (tsect < sysect)
return -EINVAL; /* (Invalid volume size) */
/* Number of clusters */
nclst = (tsect - sysect) / fs->csize;
if (!nclst)
return -EINVAL; /* (Invalid volume size) */
if (fmt == FS_FAT12 && nclst >= MIN_FAT16)
fmt = FS_FAT16;
/* Boundaries and Limits */
/* Number of FAT entries */
fs->n_fatent = nclst + 2;
/* Data start sector */
fs->database = bsect + sysect;
/* FAT start sector */
fs->fatbase = bsect + nrsv;
if (fmt == FS_FAT32) {
if (fs->n_rootdir)
return -EINVAL; /* (BPB_RootEntCnt must be 0) */
/* Root directory start cluster */
fs->dirbase = LD_DWORD(fs->win+BPB_RootClus);
/* (Required FAT size) */
szbfat = fs->n_fatent * 4;
} else {
if (!fs->n_rootdir)
return -EINVAL;/* (BPB_RootEntCnt must not be 0) */
/* Root directory start sector */
fs->dirbase = fs->fatbase + fasize;
/* (Required FAT size) */
szbfat = (fmt == FS_FAT16) ?
fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
}
/* (BPB_FATSz must not be less than required) */
if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))
return -EINVAL;
#ifdef CONFIG_FS_FAT_WRITE
/* Initialize cluster allocation information */
fs->free_clust = 0xFFFFFFFF;
fs->last_clust = 0;
/* Get fsinfo if available */
if (fmt == FS_FAT32) {
fs->fsi_flag = 0;
fs->fsi_sector = bsect + LD_WORD(fs->win+BPB_FSInfo);
if (disk_read(fs, 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
fs->fs_type = fmt; /* FAT sub-type */
fs->winsect = 0; /* Invalidate sector cache */
fs->wflag = 0;
return 0;
}
/*
* Mount/Unmount a Logical Drive
*/
int f_mount (
FATFS *fs /* Pointer to new file system object (NULL for unmount)*/
)
{
fs->fs_type = 0; /* Clear new fs object */
return chk_mounted(fs, 0);
}
/*
* Open or Create a File
*/
int f_open (
FATFS *fatfs,
FIL *fp, /* Pointer to the blank file object */
const TCHAR *path, /* Pointer to the file name */
BYTE mode /* Access mode and file open mode flags */
)
{
int res = 0;
FF_DIR dj;
BYTE *dir;
DEF_NAMEBUF;
fp->fs = NULL; /* Clear file object */
#ifdef CONFIG_FS_FAT_WRITE
mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
dj.fs = fatfs;
#else
mode &= FA_READ;
dj.fs = fatfs;
#endif
INIT_BUF(dj);
if (res == 0)
res = follow_path(&dj, path); /* Follow the file path */
dir = dj.dir;
#ifdef CONFIG_FS_FAT_WRITE /* R/W configuration */
if (res == 0) {
if (!dir) /* Current dir itself */
res = -EISDIR;
}
/* Create or Open a file */
if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
DWORD dw, cl;
if (res != 0) { /* No file, create new */
if (res == -ENOENT) /* There is no file to open, create a new entry */
res = dir_register(&dj);
mode |= FA_CREATE_ALWAYS; /* File is created */
dir = dj.dir; /* New entry */
} else { /* Any object is already existing */
if (dir[DIR_Attr] & AM_RDO) {
res = -EROFS;
} else if (dir[DIR_Attr] & AM_DIR) { /* Cannot overwrite it (R/O or FF_DIR) */
res = -EISDIR;
} else {
if (mode & FA_CREATE_NEW) /* Cannot create as new file */
res = -EEXIST;
}
}
if (res == 0 && (mode & FA_CREATE_ALWAYS)) { /* Truncate it if overwrite mode */
dw = get_fattime(); /* Created time */
ST_DWORD(dir+DIR_CrtTime, dw);
dir[DIR_Attr] = 0; /* Reset attribute */
ST_DWORD(dir+DIR_FileSize, 0); /* size = 0 */
cl = LD_CLUST(dir); /* Get start cluster */
ST_CLUST(dir, 0); /* cluster = 0 */
dj.fs->wflag = 1;
if (cl) { /* Remove the cluster chain if exist */
dw = dj.fs->winsect;
res = remove_chain(dj.fs, cl);
if (res == 0) {
dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */
res = move_window(dj.fs, dw);
}
}
}
} else { /* Open an existing file */
if (res == 0) { /* Follow succeeded */
if (dir[DIR_Attr] & AM_DIR) { /* It is a directory */
res = -EISDIR;
} else {
if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
res = -EROFS;
}
}
}
if (res == 0) {
if (mode & FA_CREATE_ALWAYS) /* Set file change flag if created or overwritten */
mode |= FA__WRITTEN;
fp->dir_sect = dj.fs->winsect; /* Pointer to the directory entry */
fp->dir_ptr = dir;
}
#else /* R/O configuration */
if (res == 0) { /* Follow succeeded */
if (!dir) { /* Current dir itself */
res = -EISDIR;
} else {
if (dir[DIR_Attr] & AM_DIR) /* It is a directory */
res = -EISDIR;
}
}
#endif
FREE_BUF();
if (res == 0) {
fp->flag = mode; /* File access mode */
fp->sclust = LD_CLUST(dir); /* File start cluster */
fp->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
fp->fptr = 0; /* File pointer */
fp->dsect = 0;
fp->fs = dj.fs;
}
return res;
}
/*
* Read File
*/
int 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 */
)
{
DWORD clst, sect, remain;
UINT rcnt, cc;
BYTE csect, *rbuff = buff;
*br = 0; /* Initialize byte counter */
if (fp->flag & FA__ERROR) /* Aborted file? */
return -ERESTARTSYS;
if (!(fp->flag & FA_READ)) /* Check access mode */
return -EROFS;
remain = fp->fsize - fp->fptr;
if (btr > remain)
btr = (UINT)remain; /* Truncate btr by remaining bytes */
/* Repeat until all data read */
for ( ; btr; rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1)); /* Sector offset in the cluster */
if (!csect) { /* On the cluster boundary? */
if (fp->fptr == 0) { /* On the top of the file? */
clst = fp->sclust; /* Follow from the origin */
} else { /* Middle or end of the file */
clst = get_fat(fp->fs, fp->clust); /* Follow cluster chain on the FAT */
}
if (clst < 2)
ABORT(fp->fs, -ERESTARTSYS);
if (clst == 0xFFFFFFFF)
ABORT(fp->fs, -EIO);
fp->clust = clst; /* Update current cluster */
}
sect = clust2sect(fp->fs, fp->clust); /* Get current sector */
if (!sect)
ABORT(fp->fs, -ERESTARTSYS);
sect += csect;
cc = btr / SS(fp->fs); /* When remaining bytes >= sector size, */
if (cc) { /* Read maximum contiguous sectors directly */
if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
cc = fp->fs->csize - csect;
if (disk_read(fp->fs, rbuff, sect, (BYTE)cc) != RES_OK)
ABORT(fp->fs, -EIO);
#if defined CONFIG_FS_FAT_WRITE
/* Replace one of the read sectors with cached data if it contains a dirty sector */
if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
memcpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
#endif
rcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
continue;
}
if (fp->dsect != sect) { /* Load data sector if not in cache */
#ifdef CONFIG_FS_FAT_WRITE
if (fp->flag & FA__DIRTY) { /* Write-back dirty sector cache */
if (disk_write(fp->fs, fp->buf, fp->dsect, 1) != RES_OK)
ABORT(fp->fs, -EIO);
fp->flag &= ~FA__DIRTY;
}
#endif
if (disk_read(fp->fs, fp->buf, sect, 1) != RES_OK) /* Fill sector cache */
ABORT(fp->fs, -EIO);
}
fp->dsect = sect;
}
rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Get partial sector data from sector buffer */
if (rcnt > btr)
rcnt = btr;
memcpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt); /* Pick partial sector */
}
return 0;
}
#ifdef CONFIG_FS_FAT_WRITE
/*
* Write File
*/
int 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 */
)
{
DWORD clst, sect;
UINT wcnt, cc;
const BYTE *wbuff = buff;
BYTE csect;
*bw = 0; /* Initialize byte counter */
if (fp->flag & FA__ERROR) /* Aborted file? */
return -ERESTARTSYS;
if (!(fp->flag & FA_WRITE)) /* Check access mode */
return -EROFS;
if ((DWORD)(fp->fsize + btw) < fp->fsize)
btw = 0; /* File size cannot reach 4GB */
/* Repeat until all data written */
for ( ; btw; wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
/* On the sector boundary? */
if ((fp->fptr % SS(fp->fs)) == 0) {
/* Sector offset in the cluster */
csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));
/* On the cluster boundary? */
if (!csect) {
/* On the top of the file? */
if (fp->fptr == 0) {
clst = fp->sclust; /* Follow from the origin */
if (clst == 0) /* When no cluster is allocated, */
/* Create a new cluster chain */
fp->sclust = clst = create_chain(fp->fs, 0);
} else {
/* Middle or end of the file */
/* Follow or stretch cluster chain on the FAT */
clst = create_chain(fp->fs, fp->clust);
}
if (clst == 0)
break; /* Could not allocate a new cluster (disk full) */
if (clst == 1)
ABORT(fp->fs, -ERESTARTSYS);
if (clst == 0xFFFFFFFF)
ABORT(fp->fs, -EIO);
fp->clust = clst; /* Update current cluster */
}
if (fp->flag & FA__DIRTY) { /* Write-back sector cache */
printf("wr sector cache\n");
if (disk_write(fp->fs, fp->buf, fp->dsect, 1) != RES_OK)
ABORT(fp->fs, -EIO);
fp->flag &= ~FA__DIRTY;
}
sect = clust2sect(fp->fs, fp->clust); /* Get current sector */
if (!sect)
ABORT(fp->fs, -ERESTARTSYS);
sect += csect;
cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */
if (cc) {
/* Write maximum contiguous sectors directly */
if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
cc = fp->fs->csize - csect;
if (disk_write(fp->fs, wbuff, sect, (BYTE)cc) != RES_OK)
ABORT(fp->fs, -EIO);
if (fp->dsect - sect < cc) {
/* Refill sector cache if it gets invalidated by the direct write */
memcpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
fp->flag &= ~FA__DIRTY;
}
wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
continue;
}
if (fp->dsect != sect) {
/* Fill sector cache with file data */
if (fp->fptr < fp->fsize &&
disk_read(fp->fs, fp->buf, sect, 1) != RES_OK)
ABORT(fp->fs, -EIO);
}
fp->dsect = sect;
}
/* Put partial sector into file I/O buffer */
wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs));
if (wcnt > btw)
wcnt = btw;
memcpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */
fp->flag |= FA__DIRTY;
}
if (fp->fptr > fp->fsize)
fp->fsize = fp->fptr; /* Update file size if needed */
fp->flag |= FA__WRITTEN; /* Set file change flag */
return 0;
}
/*
* Synchronize the File Object
*/
int f_sync (
FIL *fp /* Pointer to the file object */
)
{
int res;
DWORD tim;
BYTE *dir;
/* Has the file been written? */
if (!(fp->flag & FA__WRITTEN))
return 0;
if (fp->flag & FA__DIRTY) {
if (disk_write(fp->fs, fp->buf, fp->dsect, 1) != RES_OK)
return -EIO;
fp->flag &= ~FA__DIRTY;
}
/* Update the directory entry */
res = move_window(fp->fs, fp->dir_sect);
if (res)
return res;
dir = fp->dir_ptr;
dir[DIR_Attr] |= AM_ARC; /* Set archive bit */
ST_DWORD(dir+DIR_FileSize, fp->fsize); /* Update file size */
ST_CLUST(dir, fp->sclust); /* Update start cluster */
tim = get_fattime(); /* Update updated time */
ST_DWORD(dir+DIR_WrtTime, tim);
fp->flag &= ~FA__WRITTEN;
fp->fs->wflag = 1;
res = sync(fp->fs);
return res;
}
#endif /* CONFIG_FS_FAT_WRITE */
/*
* Close File
*/
int f_close (
FIL *fp /* Pointer to the file object to be closed */
)
{
#ifndef CONFIG_FS_FAT_WRITE
fp->fs = 0; /* Discard file object */
return 0;
#else
int res;
/* Flush cached data */
res = f_sync(fp);
if (res == 0)
fp->fs = NULL; /* Discard file object */
return res;
#endif
}
/*
* Seek File R/W Pointer
*/
int f_lseek (
FIL *fp, /* Pointer to the file object */
DWORD ofs /* File pointer from top of file */
)
{
DWORD clst, bcs, nsect, ifptr;
int res = 0;
if (fp->flag & FA__ERROR) /* Check abort flag */
return -ERESTARTSYS;
if (ofs > fp->fsize /* In read-only mode, clip offset with the file size */
#ifdef CONFIG_FS_FAT_WRITE
&& !(fp->flag & FA_WRITE)
#endif
) ofs = fp->fsize;
ifptr = fp->fptr;
fp->fptr = nsect = 0;
if (ofs) {
bcs = (DWORD)fp->fs->csize * SS(fp->fs); /* Cluster size (byte) */
if (ifptr > 0 &&
(ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
fp->fptr = (ifptr - 1) & ~(bcs - 1); /* start from the current cluster */
ofs -= fp->fptr;
clst = fp->clust;
} else { /* When seek to back cluster, */
clst = fp->sclust; /* start from the first cluster */
#ifdef CONFIG_FS_FAT_WRITE
if (clst == 0) { /* If no cluster chain, create a new chain */
clst = create_chain(fp->fs, 0);
if (clst == 1)
ABORT(fp->fs, -ERESTARTSYS);
if (clst == 0xFFFFFFFF)
ABORT(fp->fs, -EIO);
fp->sclust = clst;
}
#endif
fp->clust = clst;
}
if (clst != 0) {
while (ofs > bcs) { /* Cluster following loop */
#ifdef CONFIG_FS_FAT_WRITE
if (fp->flag & FA_WRITE) { /* Check if in write mode or not */
/* Force stretch if in write mode */
clst = create_chain(fp->fs, clst);
/* When disk gets full, clip file size */
if (clst == 0) {
ofs = bcs;
break;
}
} else
#endif
/* Follow cluster chain if not in write mode */
clst = get_fat(fp->fs, clst);
if (clst == 0xFFFFFFFF)
ABORT(fp->fs, -EIO);
if (clst <= 1 || clst >= fp->fs->n_fatent)
ABORT(fp->fs, -ERESTARTSYS);
fp->clust = clst;
fp->fptr += bcs;
ofs -= bcs;
}
fp->fptr += ofs;
if (ofs % SS(fp->fs)) {
nsect = clust2sect(fp->fs, clst); /* Current sector */
if (!nsect)
ABORT(fp->fs, -ERESTARTSYS);
nsect += ofs / SS(fp->fs);
}
}
}
if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) { /* Fill sector cache if needed */
#ifdef CONFIG_FS_FAT_WRITE
if (fp->flag & FA__DIRTY) { /* Write-back dirty sector cache */
if (disk_write(fp->fs, fp->buf, fp->dsect, 1) != RES_OK)
ABORT(fp->fs, -EIO);
fp->flag &= ~FA__DIRTY;
}
#endif
if (disk_read(fp->fs, fp->buf, nsect, 1) != RES_OK) /* Fill sector cache */
ABORT(fp->fs, -EIO);
fp->dsect = nsect;
}
#ifdef CONFIG_FS_FAT_WRITE
if (fp->fptr > fp->fsize) { /* Set file change flag if the file size is extended */
fp->fsize = fp->fptr;
fp->flag |= FA__WRITTEN;
}
#endif
return res;
}
/*
* Create a Directroy Object
*/
int f_opendir (
FATFS *fatfs,
FF_DIR *dj, /* Pointer to directory object to create */
const TCHAR *path /* Pointer to the directory path */
)
{
int res;
DEF_NAMEBUF;
dj->fs = fatfs;
INIT_BUF(*dj);
res = follow_path(dj, path); /* Follow the path to the directory */
FREE_BUF();
if (res)
return res;
if (dj->dir) {
/* It is not the root dir */
if (dj->dir[DIR_Attr] & AM_DIR) {
/* The object is a directory */
dj->sclust = LD_CLUST(dj->dir);
} else {
/* The object is not a directory */
return -ENOTDIR;
}
}
res = dir_sdi(dj, 0); /* Rewind dir */
return res;
}
/*
* Read Directory Entry in Sequense
*/
int f_readdir (
FF_DIR *dj, /* Pointer to the open directory object */
FILINFO *fno /* Pointer to file information to return */
)
{
int res;
DEF_NAMEBUF;
if (!fno) {
res = dir_sdi(dj, 0); /* Rewind the directory object */
return res;
}
INIT_BUF(*dj);
res = dir_read(dj); /* Read an directory item */
if (res == -ENOENT) { /* Reached end of dir */
dj->sect = 0;
res = 0;
goto out;
}
/* A valid entry is found */
get_fileinfo(dj, fno); /* Get the object information */
res = dir_next(dj, 0); /* Increment index for next */
if (res == -ENOENT) {
dj->sect = 0;
res = 0;
}
out:
FREE_BUF();
return res;
}
/*
* Get File Status
*/
int f_stat (
FATFS *fatfs,
const TCHAR *path, /* Pointer to the file path */
FILINFO *fno /* Pointer to file information to return */
)
{
int res;
FF_DIR dj;
DEF_NAMEBUF;
dj.fs = fatfs;
INIT_BUF(dj);
res = follow_path(&dj, path); /* Follow the file path */
if (res == 0) { /* Follow completed */
if (dj.dir) /* Found an object */
get_fileinfo(&dj, fno);
else /* It is root dir */
res = -ENOENT;
}
FREE_BUF();
return res;
}
#ifdef CONFIG_FS_FAT_WRITE
/*
* Get Number of Free Clusters
*/
int f_getfree (
FATFS *fatfs,
const TCHAR *path, /* Pointer to the logical drive number (root dir) */
DWORD *nclst /* Pointer to the variable to return number of free clusters */
)
{
int res = 0;
DWORD n, clst, sect, stat;
UINT i;
BYTE fat, *p;
/* If free_clust is valid, return it without full cluster scan */
if (fatfs->free_clust <= fatfs->n_fatent - 2) {
*nclst = fatfs->free_clust;
return 0;
}
/* Get number of free clusters */
fat = fatfs->fs_type;
n = 0;
if (fat == FS_FAT12) {
clst = 2;
do {
stat = get_fat(fatfs, clst);
if (stat == 0xFFFFFFFF) {
res = -EIO;
break;
}
if (stat == 1) {
res = -ERESTARTSYS;
break;
}
if (stat == 0) n++;
} while (++clst < fatfs->n_fatent);
} else {
clst = fatfs->n_fatent;
sect = fatfs->fatbase;
i = 0; p = NULL;
do {
if (!i) {
res = move_window(fatfs, sect++);
if (res != 0) break;
p = fatfs->win;
i = SS(fatfs);
}
if (fat == FS_FAT16) {
if (LD_WORD(p) == 0) n++;
p += 2; i -= 2;
} else {
if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) n++;
p += 4; i -= 4;
}
} while (--clst);
}
fatfs->free_clust = n;
if (fat == FS_FAT32)
fatfs->fsi_flag = 1;
*nclst = n;
return res;
}
/*
* Truncate File
*/
int f_truncate (
FIL *fp /* Pointer to the file object */
)
{
int res = 0;
DWORD ncl;
if (fp->flag & FA__ERROR) { /* Check abort flag */
return -ERESTARTSYS;
} else {
if (!(fp->flag & FA_WRITE)) /* Check access mode */
return -EROFS;
}
if (fp->fsize <= fp->fptr)
return 0;
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 */
res = remove_chain(fp->fs, fp->sclust);
fp->sclust = 0;
} else {
/* When truncate a part of the file, remove remaining clusters */
ncl = get_fat(fp->fs, fp->clust);
if (ncl == 0xFFFFFFFF)
return -EIO;
if (ncl == 1)
return -ERESTARTSYS;
if (ncl < fp->fs->n_fatent) {
res = put_fat(fp->fs, fp->clust, 0x0FFFFFFF);
if (res)
return res;
res = remove_chain(fp->fs, ncl);
}
}
return res;
}
/*
* Delete a File or Directory
*/
int f_unlink (
FATFS *fatfs,
const TCHAR *path /* Pointer to the file or directory path */
)
{
int res;
FF_DIR dj, sdj;
BYTE *dir;
DWORD dclst;
DEF_NAMEBUF;
dj.fs = fatfs;
INIT_BUF(dj);
res = follow_path(&dj, path); /* Follow the file path */
if (res)
goto out;
if (dj.fn[NS] & NS_DOT) {
res = -EINVAL; /* Cannot remove dot entry */
goto out;
}
/* The object is accessible */
dir = dj.dir;
if (!dir) {
res = -EINVAL; /* Cannot remove the start directory */
goto out;
}
if (dir[DIR_Attr] & AM_RDO) {
res = -EROFS; /* Cannot remove R/O object */
goto out;
}
dclst = LD_CLUST(dir);
if (dir[DIR_Attr] & AM_DIR) { /* Is it a sub-dir? */
if (dclst < 2) {
res = -ERESTARTSYS;
goto out;
}
memcpy(&sdj, &dj, sizeof(FF_DIR)); /* Check if the sub-dir is empty or not */
sdj.sclust = dclst;
res = dir_sdi(&sdj, 2); /* Exclude dot entries */
if (res)
goto out;
res = dir_read(&sdj);
if (res == 0) {
res = -ENOTEMPTY; /* Not empty dir */
goto out;
}
if (res == -ENOENT)
res = 0; /* Empty */
if (res)
goto out;
}
res = dir_remove(&dj); /* Remove the directory entry */
if (res)
goto out;
if (dclst) {
/* Remove the cluster chain if exist */
res = remove_chain(dj.fs, dclst);
if (res)
goto out;
}
res = sync(dj.fs);
out:
FREE_BUF();
return res;
}
/*
* Create a Directory
*/
int f_mkdir (
FATFS *fatfs,
const TCHAR *path /* Pointer to the directory path */
)
{
int res;
FF_DIR dj;
BYTE *dir, n;
DWORD dsc, dcl, pcl, tim = get_fattime();
DEF_NAMEBUF;
dj.fs = fatfs;
INIT_BUF(dj);
res = follow_path(&dj, path); /* Follow the file path */
if (res == 0) {
res = -EEXIST; /* Any object with same name is already existing */
goto out;
}
if (res != -ENOENT)
goto out;
dcl = create_chain(dj.fs, 0); /* Allocate a cluster for the new directory table */
if (dcl == 0) {
res = -ENOSPC; /* No space to allocate a new cluster */
goto out;
}
if (dcl == 1) {
res = -ERESTARTSYS;
goto out;
}
if (dcl == 0xFFFFFFFF) {
res = -EIO;
goto out;
}
/* Flush FAT */
res = move_window(dj.fs, 0);
if (res)
goto out;
/* Initialize the new directory table */
dsc = clust2sect(dj.fs, dcl);
dir = dj.fs->win;
memset(dir, 0, SS(dj.fs));
memset(dir+DIR_Name, ' ', 8+3); /* Create "." entry */
dir[DIR_Name] = '.';
dir[DIR_Attr] = AM_DIR;
ST_DWORD(dir+DIR_WrtTime, tim);
ST_CLUST(dir, dcl);
memcpy(dir+SZ_DIR, dir, SZ_DIR); /* Create ".." entry */
dir[33] = '.'; pcl = dj.sclust;
if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
pcl = 0;
ST_CLUST(dir+SZ_DIR, pcl);
for (n = dj.fs->csize; n; n--) { /* Write dot entries and clear following sectors */
dj.fs->winsect = dsc++;
dj.fs->wflag = 1;
res = move_window(dj.fs, 0);
if (res != 0)
goto out;
memset(dir, 0, SS(dj.fs));
}
res = dir_register(&dj); /* Register the object to the directoy */
if (res) {
remove_chain(dj.fs, dcl); /* Could not register, remove cluster chain */
goto out;
}
dir = dj.dir;
dir[DIR_Attr] = AM_DIR; /* Attribute */
ST_DWORD(dir+DIR_WrtTime, tim); /* Created time */
ST_CLUST(dir, dcl); /* Table start cluster */
dj.fs->wflag = 1;
res = sync(dj.fs);
out:
FREE_BUF();
return res;
}
/*
* Change Attribute
*/
int f_chmod (
FATFS *fatfs,
const TCHAR *path, /* Pointer to the file path */
BYTE value, /* Attribute bits */
BYTE mask /* Attribute mask to change */
)
{
int res;
FF_DIR dj;
BYTE *dir;
DEF_NAMEBUF;
dj.fs = fatfs;
INIT_BUF(dj);
res = follow_path(&dj, path); /* Follow the file path */
FREE_BUF();
if (res == 0 && (dj.fn[NS] & NS_DOT))
res = -ENOENT;
if (res == 0) {
dir = dj.dir;
if (!dir) { /* Is it a root directory? */
res = -EINVAL;
} else { /* File or sub directory */
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 */
dj.fs->wflag = 1;
res = sync(dj.fs);
}
}
return res;
}
/*
* Change Timestamp
*/
int f_utime (
FATFS *fatfs,
const TCHAR *path, /* Pointer to the file/directory name */
const FILINFO *fno /* Pointer to the time stamp to be set */
)
{
int res;
FF_DIR dj;
BYTE *dir;
DEF_NAMEBUF;
dj.fs = fatfs;
INIT_BUF(dj);
res = follow_path(&dj, path); /* Follow the file path */
FREE_BUF();
if (res == 0 && (dj.fn[NS] & NS_DOT))
res = -ENOENT;
if (res == 0) {
dir = dj.dir;
if (!dir) { /* Root directory */
res = -EINVAL;
} else { /* File or sub-directory */
ST_WORD(dir+DIR_WrtTime, fno->ftime);
ST_WORD(dir+DIR_WrtDate, fno->fdate);
dj.fs->wflag = 1;
res = sync(dj.fs);
}
}
return res;
}
/*
* Rename File/Directory
*/
int f_rename (
FATFS *fatfs,
const TCHAR *path_old, /* Pointer to the old name */
const TCHAR *path_new /* Pointer to the new name */
)
{
int res;
FF_DIR djo, djn;
BYTE buf[21], *dir;
DWORD dw;
DEF_NAMEBUF;
djo.fs = fatfs;
djn.fs = djo.fs;
INIT_BUF(djo);
res = follow_path(&djo, path_old); /* Check old object */
if (res == 0 && (djo.fn[NS] & NS_DOT)) {
res = -EINVAL;
goto out;
}
if (res)
goto out;
/* Old object is found */
if (!djo.dir) { /* Is root dir? */
res = -EINVAL;
goto out;
}
memcpy(buf, djo.dir+DIR_Attr, 21); /* Save the object information except for name */
memcpy(&djn, &djo, sizeof(FF_DIR)); /* Check new object */
res = follow_path(&djn, path_new);
if (res == 0) {
res = -EEXIST; /* The new object name is already existing */
goto out;
}
if (res != -ENOENT)
goto out;
/* It ia a valid path and no name collision */
res = dir_register(&djn); /* Register the new entry */
if (res)
goto out;
dir = djn.dir; /* Copy object information except for name */
memcpy(dir+13, buf+2, 19);
dir[DIR_Attr] = buf[0] | AM_ARC;
djo.fs->wflag = 1;
/* Update .. entry in the directory if needed */
if (djo.sclust != djn.sclust && (dir[DIR_Attr] & AM_DIR)) {
dw = clust2sect(djn.fs, LD_CLUST(dir));
if (!dw) {
res = -ERESTARTSYS;
goto out;
}
res = move_window(djn.fs, dw);
if (res)
goto out;
dir = djn.fs->win+SZ_DIR; /* .. entry */
if (dir[1] == '.') {
dw = (djn.fs->fs_type == FS_FAT32 && djn.sclust == djn.fs->dirbase) ? 0 : djn.sclust;
ST_CLUST(dir, dw);
djn.fs->wflag = 1;
}
}
res = dir_remove(&djo); /* Remove old entry */
if (res)
goto out;
res = sync(djo.fs);
out:
FREE_BUF();
return res;
}
#endif /* CONFIG_FS_FAT_WRITE */
