?? tff.c
字號:
#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Open a directroy */
/*-----------------------------------------------------------------------*/
FRESULT f_opendir (
DIR *dirobj, /* Pointer to directory object to create */
const char *path /* Pointer to the directory path */
)
{
BYTE *dir;
char fn[8+3+1];
FRESULT res;
FATFS *fs = FatFs;
res = auto_mount(&path, 0);
if (res != FR_OK) return res;
res = trace_path(dirobj, fn, path, &dir); /* Trace the directory path */
if (res == FR_OK) { /* Trace completed */
if (dir != NULL) { /* It is not the root dir */
if (dir[DIR_Attr] & AM_DIR) { /* The entry is a directory */
dirobj->clust =
#if _FAT32
((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) |
#endif
LD_WORD(&dir[DIR_FstClusLO]);
dirobj->sect = clust2sect(dirobj->clust);
dirobj->index = 2;
} else { /* The entry is not a directory */
res = FR_NO_FILE;
}
}
dirobj->id = fs->id;
}
return res;
}
/*-----------------------------------------------------------------------*/
/* Read Directory Entry in Sequense */
/*-----------------------------------------------------------------------*/
FRESULT f_readdir (
DIR *dirobj, /* Pointer to the directory object */
FILINFO *finfo /* Pointer to file information to return */
)
{
BYTE *dir, c;
FRESULT res;
FATFS *fs = dirobj->fs;
res = validate(fs, dirobj->id); /* Check validity of the object */
if (res) return res;
finfo->fname[0] = 0;
while (dirobj->sect) {
if (!move_window(dirobj->sect))
return FR_RW_ERROR;
dir = &fs->win[(dirobj->index & 15) * 32]; /* pointer to the directory entry */
c = dir[DIR_Name];
if (c == 0) break; /* Has it reached to end of dir? */
if (c != 0xE5 && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */
get_fileinfo(finfo, dir);
if (!next_dir_entry(dirobj)) dirobj->sect = 0; /* Next entry */
if (finfo->fname[0]) break; /* Found valid entry */
}
return FR_OK;
}
#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status */
/*-----------------------------------------------------------------------*/
FRESULT f_stat (
const char *path, /* Pointer to the file path */
FILINFO *finfo /* Pointer to file information to return */
)
{
BYTE *dir;
char fn[8+3+1];
FRESULT res;
DIR dirobj;
res = auto_mount(&path, 0);
if (res != FR_OK) return res;
res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */
if (res == FR_OK) { /* Trace completed */
if (dir) /* Found an object */
get_fileinfo(finfo, dir);
else /* It is root dir */
res = FR_INVALID_NAME;
}
return res;
}
#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters */
/*-----------------------------------------------------------------------*/
FRESULT f_getfree (
const char *drv, /* Logical drive number */
DWORD *nclust, /* Pointer to the double word to return number of free clusters */
FATFS **fatfs /* Pointer to pointer to the file system object to return */
)
{
DWORD n, sect;
CLUST clust;
BYTE fat, f, *p;
FRESULT res;
FATFS *fs;
/* Get drive number */
res = auto_mount(&drv, 0);
if (res != FR_OK) return res;
*fatfs = fs = FatFs;
/* If number of free cluster is valid, return it without cluster scan. */
if (fs->free_clust <= fs->max_clust - 2) {
*nclust = fs->free_clust;
return FR_OK;
}
/* Count number of free clusters */
fat = fs->fs_type;
n = 0;
if (fat == FS_FAT12) {
clust = 2;
do {
if ((WORD)get_cluster(clust) == 0) n++;
} while (++clust < fs->max_clust);
} else {
clust = fs->max_clust;
sect = fs->fatbase;
f = 0; p = 0;
do {
if (!f) {
if (!move_window(sect++)) return FR_RW_ERROR;
p = fs->win;
}
if (!_FAT32 || fat == FS_FAT16) {
if (LD_WORD(p) == 0) n++;
p += 2; f += 1;
} else {
if (LD_DWORD(p) == 0) n++;
p += 4; f += 2;
}
} while (--clust);
}
fs->free_clust = n;
#if _USE_FSINFO
if (fat == FS_FAT32) fs->fsi_flag = 1;
#endif
*nclust = n;
return FR_OK;
}
/*-----------------------------------------------------------------------*/
/* Delete a File or a Directory */
/*-----------------------------------------------------------------------*/
FRESULT f_unlink (
const char *path /* Pointer to the file or directory path */
)
{
BYTE *dir, *sdir;
DWORD dsect;
char fn[8+3+1];
CLUST dclust;
FRESULT res;
DIR dirobj;
FATFS *fs = FatFs;
res = auto_mount(&path, 1);
if (res != FR_OK) return res;
res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */
if (res != FR_OK) return res; /* Trace failed */
if (dir == NULL) return FR_INVALID_NAME; /* It is the root directory */
if (dir[DIR_Attr] & AM_RDO) return FR_DENIED; /* It is a R/O object */
dsect = fs->winsect;
dclust =
#if _FAT32
((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) |
#endif
LD_WORD(&dir[DIR_FstClusLO]);
if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */
dirobj.clust = dclust; /* Check if the sub-dir is empty or not */
dirobj.sect = clust2sect(dclust);
dirobj.index = 2;
do {
if (!move_window(dirobj.sect)) return FR_RW_ERROR;
sdir = &fs->win[(dirobj.index & 15) * 32];
if (sdir[DIR_Name] == 0) break;
if (sdir[DIR_Name] != 0xE5 && !(sdir[DIR_Attr] & AM_VOL))
return FR_DENIED; /* The directory is not empty */
} while (next_dir_entry(&dirobj));
}
if (!move_window(dsect)) return FR_RW_ERROR; /* Mark the directory entry 'deleted' */
dir[DIR_Name] = 0xE5;
fs->winflag = 1;
if (!remove_chain(dclust)) return FR_RW_ERROR; /* Remove the cluster chain */
return sync();
}
/*-----------------------------------------------------------------------*/
/* Create a Directory */
/*-----------------------------------------------------------------------*/
FRESULT f_mkdir (
const char *path /* Pointer to the directory path */
)
{
BYTE *dir, *fw, n;
char fn[8+3+1];
DWORD sect, dsect, tim;
CLUST dclust, pclust;
FRESULT res;
DIR dirobj;
FATFS *fs = FatFs;
res = auto_mount(&path, 1);
if (res != FR_OK) return res;
res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */
if (res == FR_OK) return FR_EXIST; /* Any file or directory is already existing */
if (res != FR_NO_FILE) return res;
res = reserve_direntry(&dirobj, &dir); /* Reserve a directory entry */
if (res != FR_OK) return res;
sect = fs->winsect;
dclust = create_chain(0); /* Allocate a cluster for new directory table */
if (dclust == 1) return FR_RW_ERROR;
dsect = clust2sect(dclust);
if (!dsect) return FR_DENIED;
if (!move_window(dsect)) return FR_RW_ERROR;
fw = fs->win;
memset(fw, 0, 512); /* Clear the directory table */
for (n = 1; n < fs->sects_clust; n++) {
if (disk_write(0, fw, ++dsect, 1) != RES_OK)
return FR_RW_ERROR;
}
memset(&fw[DIR_Name], ' ', 8+3); /* Create "." entry */
fw[DIR_Name] = '.';
fw[DIR_Attr] = AM_DIR;
tim = get_fattime();
ST_DWORD(&fw[DIR_WrtTime], tim);
memcpy(&fw[32], &fw[0], 32); fw[33] = '.'; /* Create ".." entry */
pclust = dirobj.sclust;
#if _FAT32
ST_WORD(&fw[ DIR_FstClusHI], dclust >> 16);
if (fs->fs_type == FS_FAT32 && pclust == fs->dirbase) pclust = 0;
ST_WORD(&fw[32+DIR_FstClusHI], pclust >> 16);
#endif
ST_WORD(&fw[ DIR_FstClusLO], dclust);
ST_WORD(&fw[32+DIR_FstClusLO], pclust);
fs->winflag = 1;
if (!move_window(sect)) return FR_RW_ERROR;
memset(&dir[0], 0, 32); /* Clean-up the new entry */
memcpy(&dir[DIR_Name], fn, 8+3); /* Name */
dir[DIR_NTres] = fn[11];
dir[DIR_Attr] = AM_DIR; /* Attribute */
ST_DWORD(&dir[DIR_WrtTime], tim); /* Crated time */
ST_WORD(&dir[DIR_FstClusLO], dclust); /* Table start cluster */
#if _FAT32
ST_WORD(&dir[DIR_FstClusHI], dclust >> 16);
#endif
return sync();
}
/*-----------------------------------------------------------------------*/
/* Change File Attribute */
/*-----------------------------------------------------------------------*/
FRESULT f_chmod (
const char *path, /* Pointer to the file path */
BYTE value, /* Attribute bits */
BYTE mask /* Attribute mask to change */
)
{
FRESULT res;
BYTE *dir;
DIR dirobj;
char fn[8+3+1];
res = auto_mount(&path, 1);
if (res == FR_OK) {
res = trace_path(&dirobj, fn, path, &dir); /* Trace the file path */
if (res == FR_OK) { /* Trace completed */
if (dir == NULL) {
res = FR_INVALID_NAME;
} else {
mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC; /* Valid attribute mask */
dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */
res = sync();
}
}
}
return res;
}
/*-----------------------------------------------------------------------*/
/* Rename File/Directory */
/*-----------------------------------------------------------------------*/
FRESULT f_rename (
const char *path_old, /* Pointer to the old name */
const char *path_new /* Pointer to the new name */
)
{
FRESULT res;
DWORD sect_old;
BYTE *dir_old, *dir_new, direntry[32-11];
DIR dirobj;
char fn[8+3+1];
FATFS *fs = FatFs;
res = auto_mount(&path_old, 1);
if (res != FR_OK) return res;
res = trace_path(&dirobj, fn, path_old, &dir_old); /* Check old object */
if (res != FR_OK) return res; /* The old object is not found */
if (!dir_old) return FR_NO_FILE;
sect_old = fs->winsect; /* Save the object information */
memcpy(direntry, &dir_old[11], 32-11);
res = trace_path(&dirobj, fn, path_new, &dir_new); /* Check new object */
if (res == FR_OK) return FR_EXIST; /* The new object name is already existing */
if (res != FR_NO_FILE) return res; /* Is there no old name? */
res = reserve_direntry(&dirobj, &dir_new); /* Reserve a directory entry */
if (res != FR_OK) return res;
memcpy(&dir_new[DIR_Attr], direntry, 32-11); /* Create new entry */
memcpy(&dir_new[DIR_Name], fn, 8+3);
dir_new[DIR_NTres] = fn[11];
fs->winflag = 1;
if (!move_window(sect_old)) return FR_RW_ERROR; /* Remove old entry */
dir_old[DIR_Name] = 0xE5;
return sync();
}
#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */
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