ff.c

stm32-SDIO+FatFS文件系统txt-int-ascii

			res = dir_next(dj, 0);		/* Next entry */
		} while (res == FR_OK);
		if (res == FR_NO_FILE) res = FR_INT_ERR;
	}

#else			/* Non LFN configuration */
	res = dir_sdi(dj, dj->index);
	if (res == FR_OK) {
		res = move_window(dj->fs, dj->sect);
		if (res == FR_OK) {
			*dj->dir = 0xE5;			/* Mark the entry "deleted" */
			dj->fs->wflag = 1;
		}
	}
#endif

	return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Pick a segment and create the object name in directory form           */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name (
	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

#if _USE_LFN	/* LFN configuration */
	BYTE b, cf;
	WCHAR w, *lfn;
	int i, ni, si, di;
	const TCHAR *p;

	/* Create LFN in Unicode */
	si = di = 0;
	p = *path;
	lfn = dj->lfn;
	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 FR_INVALID_NAME;
#if !_LFN_UNICODE
		w &= 0xFF;
		if (IsDBCS1(w)) {				/* If it is a DBC 1st byte */
			b = p[si++];				/* Get 2nd byte */
			if (!IsDBCS2(b))			/* Reject invalid code for DBC */
				return FR_INVALID_NAME;
			w = (w << 8) + b;
		}
		w = ff_convert(w, 1);			/* Convert OEM to Unicode */
		if (!w) return FR_INVALID_NAME;	/* Reject invalid code */
#endif
		if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */
			return FR_INVALID_NAME;
		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 */
#if _FS_RPATH
	if ((di == 1 && lfn[di - 1] == '.') || /* Is this a dot entry? */
		(di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {
		lfn[di] = 0;
		for (i = 0; i < 11; i++)
			dj->fn[i] = (i < di) ? '.' : ' ';
		dj->fn[i] = cf | NS_DOT;		/* This is a dot entry */
		return FR_OK;
	}
#endif
	while (di) {						/* Strip trailing spaces and dots */
		w = lfn[di - 1];
		if (w != ' ' && w != '.') break;
		di--;
	}
	if (!di) return FR_INVALID_NAME;	/* Reject nul string */

	lfn[di] = 0;						/* LFN is created */

	/* Create SFN in directory form */
	mem_set(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 */
			if (i >= ni - 1) {
				cf |= NS_LOSS | NS_LFN; i = ni; continue;
			}
			dj->fn[i++] = (BYTE)(w >> 8);
		} else {						/* Single byte char */
			if (!w || chk_chr("+,;=[]", w)) {		/* Replace illegal chars for SFN */
				w = '_'; cf |= NS_LOSS | NS_LFN;	/* Lossy conversion */
			} else {
				if (IsUpper(w)) {		/* ASCII large capital */
					b |= 2;
				} else {
					if (IsLower(w)) {	/* ASCII small capital */
						b |= 1; w -= 0x20;
					}
				}
			}
		}
		dj->fn[i++] = (BYTE)w;
	}

	if (dj->fn[0] == 0xE5) dj->fn[0] = 0x05;	/* 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 FR_OK;


#else	/* Non-LFN configuration */
	BYTE b, c, d, *sfn;
	int ni, si, i;
	const char *p;

	/* Create file name in directory form */
	sfn = dj->fn;
	mem_set(sfn, ' ', 11);
	si = i = b = 0; ni = 8;
	p = *path;
#if _FS_RPATH
	if (p[si] == '.') { /* Is this a dot entry? */
		for (;;) {
			c = (BYTE)p[si++];
			if (c != '.' || si >= 3) break;
			sfn[i++] = c;
		}
		if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
		*path = &p[si];									/* Return pointer to the next segment */
		sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;	/* Set last segment flag if end of path */
		return FR_OK;
	}
#endif
	for (;;) {
		c = (BYTE)p[si++];
		if (c <= ' ' || c == '/' || c == '\\') break;	/* Break on end of segment */
		if (c == '.' || i >= ni) {
			if (ni != 8 || c != '.') return FR_INVALID_NAME;
			i = 8; ni = 11;
			b <<= 2; continue;
		}
		if (c >= 0x80) {				/* Extended char */
#ifdef _EXCVT
			c = excvt[c - 0x80];		/* Convert extend char (SBCS) */
#else
			b |= 3;						/* Eliminate NT flag if extended char is exist */
#if !_DF1S	/* ASCII only cfg */
			return FR_INVALID_NAME;
#endif
#endif
		}
		if (IsDBCS1(c)) {				/* DBC 1st byte? */
			d = (BYTE)p[si++];			/* Get 2nd byte */
			if (!IsDBCS2(d) || i >= ni - 1)	/* Reject invalid DBC */
				return FR_INVALID_NAME;
			sfn[i++] = c;
			sfn[i++] = d;
		} else {						/* Single byte code */
			if (chk_chr("\"*+,:<=>\?[]|\x7F", c))	/* Reject illegal chrs for SFN */
				return FR_INVALID_NAME;
			if (IsUpper(c)) {			/* ASCII large capital? */
				b |= 2;
			} else {
				if (IsLower(c)) {		/* ASCII small capital? */
					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 FR_INVALID_NAME;		/* Reject nul string */
	if (sfn[0] == 0xE5) sfn[0] = 0x05;	/* When first char collides with 0xE5, 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 FR_OK;
#endif
}




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static
void get_fileinfo (		/* No return code */
	DIR *dj,			/* Pointer to the directory object */
	FILINFO *fno	 	/* Pointer to the file information to be filled */
)
{
	int 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 == 0x05) c = (TCHAR)0xE5;
			if (_USE_LFN && (nt & NS_BODY) && IsUpper(c)) c += 0x20;
#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;
				if (_USE_LFN && (nt & NS_EXT) && IsUpper(c)) c += 0x20;
#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;

#if _USE_LFN
	if (fno->lfname) {
		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) { i = 0; break; }		/* Could not convert, no LFN */
				if (_DF1S && w >= 0x100)		/* Put 1st byte if it is a DBC */
					tp[i++] = (TCHAR)(w >> 8);
#endif
				if (i >= fno->lfsize - 1) { i = 0; break; }	/* Buffer overrun, no LFN */
				tp[i++] = (TCHAR)w;
			}
		}
		tp[i] = 0;	/* Terminator */
	}
#endif
}
#endif /* _FS_MINIMIZE <= 1 */




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path (	/* FR_OK(0): successful, !=0: error code */
	DIR *dj,			/* Directory object to return last directory and found object */
	const TCHAR *path	/* Full-path string to find a file or directory */
)
{
	FRESULT res;
	BYTE *dir, ns;


#if _FS_RPATH
	if (*path == '/' || *path == '\\') { /* There is a heading separator */
		path++;	dj->sclust = 0;		/* Strip it and start from the root dir */
	} else {							/* No heading separator */
		dj->sclust = dj->fs->cdir;	/* Start from the current dir */
	}
#else
	if (*path == '/' || *path == '\\')	/* Strip heading separator if exist */
		path++;
	dj->sclust = 0;						/* Start from the root dir */
#endif

	if ((UINT)*path < ' ') {			/* Nul path means the start directory itself */
		res = dir_sdi(dj, 0);
		dj->dir = 0;

	} else {							/* Follow path */
		for (;;) {
			res = create_name(dj, &path);	/* Get a segment */
			if (res != FR_OK) break;
			res = dir_find(dj);				/* Find it */
			ns = *(dj->fn+NS);
			if (res != FR_OK) {				/* Failed to find the object */
				if (res != FR_NO_FILE) break;	/* Abort if any hard error occured */
				/* Object not found */
				if (_FS_RPATH && (ns & NS_DOT)) {	/* If dot entry is not exit */
					dj->sclust = 0; dj->dir = 0;	/* It is the root dir */
					res = FR_OK;
					if (!(ns & NS_LAST)) continue;
				} else {							/* Could not find the object */
					if (!(ns & NS_LAST)) res = FR_NO_PATH;
				}
				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 = FR_NO_PATH; break;
			}
			dj->sclust = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO);
		}
	}

	return res;
}




/*-----------------------------------------------------------------------*/
/* Load boot record and check if it is an FAT boot record                */
/*-----------------------------------------------------------------------*/

static
BYTE 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 */
)
{
	if (disk_read(fs->drv, fs->win, sect, 1) != RES_OK)	/* Load boot record */
		return 3;
	if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)		/* Check record signature (always placed at offset 510 even if the sector size is >512) */
		return 2;

	if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)	/* Check "FAT" string */
		return 0;
	if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)
		return 0;

	return 1;
}




/*-----------------------------------------------------------------------*/
/* Make sure that the file system is valid                               */
/*-----------------------------------------------------------------------*/

static