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ff.cpp
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ff.cpp
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#include "ff.h"
#include "diskio.h"
#include "pxt.h"
#define MAX_DIR 0x200000
#define MAX_DIR_EX 0x10000000
#define MAX_FAT12 0xFF5
#define MAX_FAT16 0xFFF5
#define MAX_FAT32 0x0FFFFFF5
#define IsLower(c) ((c) >= 'a' && (c) <= 'z')
#define IsDigit(c) ((c) >= '0' && (c) <= '9')
#define FA_SEEKEND 0x20
#define FA_MODIFIED 0x40
#define AM_VOL 0x08
#define AM_LFN 0x0F
#define AM_MASK 0x3F
#define NSFLAG 11
#define NS_LAST 0x04
#define NS_DOT 0x20
#define NS_NONAME 0x80
#define BS_JmpBoot 0
#define BPB_BytsPerSec 11
#define BPB_SecPerClus 13
#define BPB_RsvdSecCnt 14
#define BPB_NumFATs 16
#define BPB_RootEntCnt 17
#define BPB_TotSec16 19
#define BPB_FATSz16 22
#define BPB_TotSec32 32
#define BS_FilSysType 54
#define BS_55AA 510
#define BPB_FATSz32 36
#define BPB_FSVer32 42
#define BPB_RootClus32 44
#define BPB_FSInfo32 48
#define BS_FilSysType32 82
#define DIR_Name 0
#define DIR_Attr 11
#define DIR_CrtTime 14
#define DIR_LstAccDate 18
#define DIR_FstClusHI 20
#define DIR_ModTime 22
#define DIR_FstClusLO 26
#define DIR_FileSize 28
#define SZDIRE 32
#define DDEM 0xE5
#define RDDEM 0x05
#define FSI_LeadSig 0
#define FSI_StrucSig 484
#define FSI_Free_Count 488
#define FSI_Nxt_Free 492
#define MBR_Table 446
#define SZ_PTE 16
#define PTE_StLba 8
#define ABORT(fs, res) \
{ \
fp->err = (BYTE)(res); \
LEAVE_FF(fs, res); \
}
#define LEAVE_FF(fs, res) return res
#define LD2PD(vol) (BYTE)(vol)
#define LD2PT(vol) 0
#define SS(fs) ((UINT)FF_MAX_SS)
#define GET_FATTIME() ((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16)
#define TBL_DC932 \
{ \
0x81, 0x9F, 0xE0, 0xFC, 0x40, 0x7E, 0x80, 0xFC, 0x00, 0x00 \
}
#define MERGE_2STR(a, b) a##b
#define MKCVTBL(hd, cp) MERGE_2STR(hd, cp)
static FATFS *FatFs[FF_VOLUMES];
static WORD Fsid;
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
static const BYTE DbcTbl[] = MKCVTBL(TBL_DC, FF_CODE_PAGE);
static WORD ld_word(const BYTE *ptr)
{
WORD rv;
rv = ptr[1];
rv = rv << 8 | ptr[0];
return rv;
}
static DWORD ld_dword(const BYTE *ptr)
{
DWORD rv;
rv = ptr[3];
rv = rv << 8 | ptr[2];
rv = rv << 8 | ptr[1];
rv = rv << 8 | ptr[0];
return rv;
}
#if !FF_FS_READONLY
static void st_word(BYTE *ptr, WORD val)
{
*ptr++ = (BYTE)val;
val >>= 8;
*ptr++ = (BYTE)val;
}
static void st_dword(BYTE *ptr, DWORD val)
{
*ptr++ = (BYTE)val;
val >>= 8;
*ptr++ = (BYTE)val;
val >>= 8;
*ptr++ = (BYTE)val;
val >>= 8;
*ptr++ = (BYTE)val;
}
#endif
static void mem_cpy(void *dst, const void *src, UINT cnt)
{
BYTE *d = (BYTE *)dst;
const BYTE *s = (const BYTE *)src;
if (cnt != 0)
{
do
{
*d++ = *s++;
} while (--cnt);
}
}
static void mem_set(void *dst, int val, UINT cnt)
{
BYTE *d = (BYTE *)dst;
do
{
*d++ = (BYTE)val;
} while (--cnt);
}
static int mem_cmp(const void *dst, const void *src, UINT cnt)
{
const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
int r = 0;
do
{
r = *d++ - *s++;
} while (--cnt && r == 0);
return r;
}
static int chk_chr(const char *str, int chr)
{
while (*str && *str != chr)
str++;
return *str;
}
static int dbc_1st(BYTE c)
{
if (c >= DbcTbl[0])
{
if (c <= DbcTbl[1])
return 1;
if (c >= DbcTbl[2] && c <= DbcTbl[3])
return 1;
}
return 0;
}
static int dbc_2nd(BYTE c)
{
if (c >= DbcTbl[4])
{
if (c <= DbcTbl[5])
return 1;
if (c >= DbcTbl[6] && c <= DbcTbl[7])
return 1;
if (c >= DbcTbl[8] && c <= DbcTbl[9])
return 1;
}
return 0;
}
#if !FF_FS_READONLY
static FRESULT sync_window(
FATFS *fs)
{
FRESULT res = FR_OK;
if (fs->wflag)
{
if (disk_write(fs->pdrv, fs->win, fs->winsect, 1) == RES_OK)
{
fs->wflag = 0;
if (fs->winsect - fs->fatbase < fs->fsize)
{
if (fs->n_fats == 2)
disk_write(fs->pdrv, fs->win, fs->winsect + fs->fsize, 1);
}
}
else
{
res = FR_DISK_ERR;
}
}
return res;
}
#endif
static FRESULT move_window(
FATFS *fs,
LBA_t sect)
{
FRESULT res = FR_OK;
if (sect != fs->winsect)
{
#if !FF_FS_READONLY
res = sync_window(fs);
#endif
if (res == FR_OK)
{
if (disk_read(fs->pdrv, fs->win, sect, 1) != RES_OK)
{
sect = (LBA_t)0 - 1;
res = FR_DISK_ERR;
}
fs->winsect = sect;
}
}
return res;
}
#if !FF_FS_READONLY
static FRESULT sync_fs(
FATFS *fs)
{
FRESULT res;
res = sync_window(fs);
if (res == FR_OK)
{
if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1)
{
mem_set(fs->win, 0, sizeof fs->win);
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_clst);
st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
fs->winsect = fs->volbase + 1;
disk_write(fs->pdrv, fs->win, fs->winsect, 1);
fs->fsi_flag = 0;
}
if (disk_ioctl(fs->pdrv, CTRL_SYNC, 0) != RES_OK)
res = FR_DISK_ERR;
}
return res;
}
#endif
static LBA_t clst2sect(
FATFS *fs,
DWORD clst)
{
clst -= 2;
if (clst >= fs->n_fatent - 2)
return 0;
return fs->database + (LBA_t)fs->csize * clst;
}
static DWORD get_fat(
FFOBJID *obj,
DWORD clst)
{
UINT wc, bc;
DWORD val;
FATFS *fs = obj->fs;
if (clst < 2 || clst >= fs->n_fatent)
{
val = 1;
}
else
{
val = 0xFFFFFFFF;
switch (fs->fs_type)
{
case FS_FAT32:
if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK)
break;
val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;
break;
default:
val = 1;
}
}
return val;
}
#if !FF_FS_READONLY
static FRESULT put_fat(
FATFS *fs,
DWORD clst,
DWORD val)
{
UINT bc;
BYTE *p;
FRESULT res = FR_INT_ERR;
if (clst >= 2 && clst < fs->n_fatent)
{
switch (fs->fs_type)
{
case FS_FAT32:
res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
if (res != FR_OK)
break;
if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT)
{
val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
}
st_dword(fs->win + clst * 4 % SS(fs), val);
fs->wflag = 1;
break;
}
}
return res;
}
#endif
#if !FF_FS_READONLY
static FRESULT remove_chain(
FFOBJID *obj,
DWORD clst,
DWORD pclst)
{
FRESULT res = FR_OK;
DWORD nxt;
FATFS *fs = obj->fs;
if (clst < 2 || clst >= fs->n_fatent)
return FR_INT_ERR;
if (pclst != 0 && (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2))
{
res = put_fat(fs, pclst, 0xFFFFFFFF);
if (res != FR_OK)
return res;
}
do
{
nxt = get_fat(obj, clst);
if (nxt == 0)
break;
if (nxt == 1)
return FR_INT_ERR;
if (nxt == 0xFFFFFFFF)
return FR_DISK_ERR;
if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT)
{
res = put_fat(fs, clst, 0);
if (res != FR_OK)
return res;
}
if (fs->free_clst < fs->n_fatent - 2)
{
fs->free_clst++;
fs->fsi_flag |= 1;
}
clst = nxt;
} while (clst < fs->n_fatent);
return FR_OK;
}
static DWORD create_chain(
FFOBJID *obj,
DWORD clst)
{
DWORD cs, ncl, scl;
FRESULT res;
FATFS *fs = obj->fs;
if (clst == 0)
{
scl = fs->last_clst;
if (scl == 0 || scl >= fs->n_fatent)
scl = 1;
}
else
{
cs = get_fat(obj, clst);
if (cs < 2)
return 1;
if (cs == 0xFFFFFFFF)
return cs;
if (cs < fs->n_fatent)
return cs;
scl = clst;
}
if (fs->free_clst == 0)
return 0;
{
ncl = 0;
if (scl == clst)
{
ncl = scl + 1;
if (ncl >= fs->n_fatent)
ncl = 2;
cs = get_fat(obj, ncl);
if (cs == 1 || cs == 0xFFFFFFFF)
return cs;
if (cs != 0)
{
cs = fs->last_clst;
if (cs >= 2 && cs < fs->n_fatent)
scl = cs;
ncl = 0;
}
}
if (ncl == 0)
{
ncl = scl;
for (;;)
{
ncl++;
if (ncl >= fs->n_fatent)
{
ncl = 2;
if (ncl > scl)
return 0;
}
cs = get_fat(obj, ncl);
if (cs == 0)
break;
if (cs == 1 || cs == 0xFFFFFFFF)
return cs;
if (ncl == scl)
return 0;
}
}
res = put_fat(fs, ncl, 0xFFFFFFFF);
if (res == FR_OK && clst != 0)
{
res = put_fat(fs, clst, ncl);
}
}
if (res == FR_OK)
{
fs->last_clst = ncl;
if (fs->free_clst <= fs->n_fatent - 2)
fs->free_clst--;
fs->fsi_flag |= 1;
}
else
{
ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
}
return ncl;
}
#endif
#if !FF_FS_READONLY
static FRESULT dir_clear(
FATFS *fs,
DWORD clst)
{
LBA_t sect;
UINT n, szb;
BYTE *ibuf;
if (sync_window(fs) != FR_OK)
return FR_DISK_ERR;
sect = clst2sect(fs, clst);
fs->winsect = sect;
mem_set(fs->win, 0, sizeof fs->win);
{
ibuf = fs->win;
szb = 1;
for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb)
;
}
return (n == fs->csize) ? FR_OK : FR_DISK_ERR;
}
#endif
static FRESULT dir_sdi(
DIR *dp,
DWORD ofs)
{
DWORD csz, clst;
FATFS *fs = dp->obj.fs;
if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) || ofs % SZDIRE)
{
return FR_INT_ERR;
}
dp->dptr = ofs;
clst = dp->obj.sclust;
if (clst == 0 && fs->fs_type >= FS_FAT32)
{
clst = (DWORD)fs->dirbase;
if (FF_FS_EXFAT)
dp->obj.stat = 0;
}
if (clst == 0)
{
if (ofs / SZDIRE >= fs->n_rootdir)
return FR_INT_ERR;
dp->sect = fs->dirbase;
}
else
{
csz = (DWORD)fs->csize * SS(fs);
while (ofs >= csz)
{
clst = get_fat(&dp->obj, clst);
if (clst == 0xFFFFFFFF)
return FR_DISK_ERR;
if (clst < 2 || clst >= fs->n_fatent)
return FR_INT_ERR;
ofs -= csz;
}
dp->sect = clst2sect(fs, clst);
}
dp->clust = clst;
if (dp->sect == 0)
return FR_INT_ERR;
dp->sect += ofs / SS(fs);
dp->dir = fs->win + (ofs % SS(fs));
return FR_OK;
}
static FRESULT dir_next(
DIR *dp,
int stretch)
{
DWORD ofs, clst;
FATFS *fs = dp->obj.fs;
ofs = dp->dptr + SZDIRE;
if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR))
dp->sect = 0;
if (dp->sect == 0)
return FR_NO_FILE;
if (ofs % SS(fs) == 0)
{
dp->sect++;
if (dp->clust == 0)
{
if (ofs / SZDIRE >= fs->n_rootdir)
{
dp->sect = 0;
return FR_NO_FILE;
}
}
else
{
if ((ofs / SS(fs) & (fs->csize - 1)) == 0)
{
clst = get_fat(&dp->obj, dp->clust);
if (clst <= 1)
return FR_INT_ERR;
if (clst == 0xFFFFFFFF)
return FR_DISK_ERR;
if (clst >= fs->n_fatent)
{
if (!stretch)
{
dp->sect = 0;
return FR_NO_FILE;
}
clst = create_chain(&dp->obj, dp->clust);
if (clst == 0)
return FR_DENIED;
if (clst == 1)
return FR_INT_ERR;
if (clst == 0xFFFFFFFF)
return FR_DISK_ERR;
if (dir_clear(fs, clst) != FR_OK)
return FR_DISK_ERR;
if (FF_FS_EXFAT)
dp->obj.stat |= 4;
}
dp->clust = clst;
dp->sect = clst2sect(fs, clst);
}
}
}
dp->dptr = ofs;
dp->dir = fs->win + ofs % SS(fs);
return FR_OK;
}
#if !FF_FS_READONLY
static FRESULT dir_alloc(
DIR *dp,
UINT nent)
{
FRESULT res;
UINT n;
FATFS *fs = dp->obj.fs;
res = dir_sdi(dp, 0);
if (res == FR_OK)
{
n = 0;
do
{
res = move_window(fs, dp->sect);
if (res != FR_OK)
break;
if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)
{
if (++n == nent)
break;
}
else
{
n = 0;
}
res = dir_next(dp, 1);
} while (res == FR_OK);
}
if (res == FR_NO_FILE)
res = FR_DENIED;
return res;
}
#endif
static DWORD ld_clust(
FATFS *fs,
const BYTE *dir)
{
DWORD cl;
cl = ld_word(dir + DIR_FstClusLO);
if (fs->fs_type == FS_FAT32)
{
cl |= (DWORD)ld_word(dir + DIR_FstClusHI) << 16;
}
return cl;
}
#if !FF_FS_READONLY
static void st_clust(
FATFS *fs,
BYTE *dir,
DWORD cl)
{
st_word(dir + DIR_FstClusLO, (WORD)cl);
if (fs->fs_type == FS_FAT32)
{
st_word(dir + DIR_FstClusHI, (WORD)(cl >> 16));
}
}
#endif
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
#define DIR_READ_FILE(dp) dir_read(dp, 0)
#define DIR_READ_LABEL(dp) dir_read(dp, 1)
static FRESULT dir_read(
DIR *dp,
int vol)
{
FRESULT res = FR_NO_FILE;
FATFS *fs = dp->obj.fs;
BYTE attr, b;
while (dp->sect)
{
res = move_window(fs, dp->sect);
if (res != FR_OK)
break;
b = dp->dir[DIR_Name];
if (b == 0)
{
res = FR_NO_FILE;
break;
}
{
dp->obj.attr = attr = dp->dir[DIR_Attr] & AM_MASK;
if (b != DDEM && b != '.' && attr != AM_LFN && (int)((attr & ~AM_ARC) == AM_VOL) == vol)
{
break;
}
}
res = dir_next(dp, 0);
if (res != FR_OK)
break;
}
if (res != FR_OK)
dp->sect = 0;
return res;
}
#endif
static FRESULT dir_find(
DIR *dp)
{
FRESULT res;
FATFS *fs = dp->obj.fs;
BYTE c;
res = dir_sdi(dp, 0);
if (res != FR_OK)
return res;
do
{
res = move_window(fs, dp->sect);
if (res != FR_OK)
break;
c = dp->dir[DIR_Name];
if (c == 0)
{
res = FR_NO_FILE;
break;
}
dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
if (!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11))
break;
res = dir_next(dp, 0);
} while (res == FR_OK);
return res;
}
#if !FF_FS_READONLY
static FRESULT dir_register(
DIR *dp)
{
FRESULT res;
FATFS *fs = dp->obj.fs;
res = dir_alloc(dp, 1);
if (res == FR_OK)
{
res = move_window(fs, dp->sect);
if (res == FR_OK)
{
mem_set(dp->dir, 0, SZDIRE);
mem_cpy(dp->dir + DIR_Name, dp->fn, 11);
fs->wflag = 1;
}
}
return res;
}
#endif
#if !FF_FS_READONLY && FF_FS_MINIMIZE == 0
static FRESULT dir_remove(
DIR *dp)
{
FRESULT res;
FATFS *fs = dp->obj.fs;
res = move_window(fs, dp->sect);
if (res == FR_OK)
{
dp->dir[DIR_Name] = DDEM;
fs->wflag = 1;
}
return res;
}
#endif
#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
static void get_fileinfo(
DIR *dp,
FILINFO *fno)
{
UINT si, di;
TCHAR c;
fno->fname[0] = 0;
if (dp->sect == 0)
return;
si = di = 0;
while (si < 11)
{
c = (TCHAR)dp->dir[si++];
if (c == ' ')
continue;
if (c == RDDEM)
c = DDEM;
if (si == 9)
fno->fname[di++] = '.';
fno->fname[di++] = c;
}
fno->fname[di] = 0;
fno->fattrib = dp->dir[DIR_Attr];
fno->fsize = ld_dword(dp->dir + DIR_FileSize);
fno->ftime = ld_word(dp->dir + DIR_ModTime + 0);
fno->fdate = ld_word(dp->dir + DIR_ModTime + 2);
}
#endif
static FRESULT create_name(
DIR *dp,
const TCHAR **path)
{
BYTE c, d, *sfn;
UINT ni, si, i;
const char *p;
p = *path;
sfn = dp->fn;
mem_set(sfn, ' ', 11);
si = i = 0;
ni = 8;
for (;;)
{
c = (BYTE)p[si++];
if (c <= ' ')
break;
if (c == '/' || c == '\\')
{
while (p[si] == '/' || p[si] == '\\')
si++;
break;
}
if (c == '.' || i >= ni)
{
if (ni == 11 || c != '.')
return FR_INVALID_NAME;
i = 8;
ni = 11;
continue;
}
if (dbc_1st(c))
{
d = (BYTE)p[si++];
if (!dbc_2nd(d) || i >= ni - 1)
return FR_INVALID_NAME;
sfn[i++] = c;
sfn[i++] = d;
}
else
{
if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))
return FR_INVALID_NAME;
if (IsLower(c))
c -= 0x20;
sfn[i++] = c;
}
}
*path = p + si;
if (i == 0)
return FR_INVALID_NAME;
if (sfn[0] == DDEM)
sfn[0] = RDDEM;
sfn[NSFLAG] = (c <= ' ') ? NS_LAST : 0;
return FR_OK;
}
static FRESULT follow_path(
DIR *dp,
const TCHAR *path)
{
FRESULT res;
BYTE ns;
FATFS *fs = dp->obj.fs;
{
while (*path == '/' || *path == '\\')
path++;
dp->obj.sclust = 0;
}
if ((UINT)*path < ' ')
{
dp->fn[NSFLAG] = NS_NONAME;
res = dir_sdi(dp, 0);
}
else
{
for (;;)
{
res = create_name(dp, &path);
if (res != FR_OK)
break;
res = dir_find(dp);
ns = dp->fn[NSFLAG];
if (res != FR_OK)
{
if (res == FR_NO_FILE)
{
if (FF_FS_RPATH && (ns & NS_DOT))
{
if (!(ns & NS_LAST))
continue;
dp->fn[NSFLAG] = NS_NONAME;
res = FR_OK;
}
else
{
if (!(ns & NS_LAST))
res = FR_NO_PATH;
}
}
break;
}
if (ns & NS_LAST)
break;
if (!(dp->obj.attr & AM_DIR))
{
res = FR_NO_PATH;
break;
}
{
dp->obj.sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));
}
}
}
return res;
}
static int get_ldnumber(
const TCHAR **path)
{
const TCHAR *tp, *tt;