?? 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 */
)
{
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