1 // SPDX-License-Identifier: GPL-2.0-or-later
19 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)  in cifs_remap()
21 	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)  in cifs_remap()
29 /* Convert character using the SFU - "Services for Unix" remapping range */
63 /* Convert character using the SFM - "Services for Mac" remapping range */
68 		*target = src_char - 0xF000;  in convert_sfm_char()
107  * cifs_mapchar - convert a host-endian char to proper char in codepage
108  * @target - where converted character should be copied
109  * @src_char - 2 byte host-endian source character
110  * @cp - codepage to which character should be converted
111  * @map_type - How should the 7 NTFS/SMB reserved characters be mapped to UCS2?
113  * This function handles the conversion of a single character. It is the
114  * responsibility of the caller to ensure that the target buffer is large
115  * enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
132 	/* if character not one of seven in special remap set */  in cifs_mapchar()
133 	len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE);  in cifs_mapchar()
141 	if (strcmp(cp->charset, "utf8"))  in cifs_mapchar()
155  * cifs_from_utf16 - convert utf16le string to local charset
156  * @to - destination buffer
157  * @from - source buffer
158  * @tolen - destination buffer size (in bytes)
159  * @fromlen - source buffer size (in bytes)
160  * @codepage - codepage to which characters should be converted
161  * @mapchar - should characters be remapped according to the mapchars option?
163  * Convert a little-endian utf16le string (as sent by the server) to a string
165  * that the code doesn't walk off of the end of the buffer (which is always
166  * a danger if the alignment of the source buffer is off). The destination
168  * buffer. Returns the length of the destination string in bytes (including
171  * Note that some windows versions actually send multiword UTF-16 characters
172  * instead of straight UTF16-2. The linux nls routines however aren't able to
173  * deal with those characters properly. In the event that we get some of
185 	__u16 ftmp[3];		/* ftmp[3] = 3array x 2bytes = 6bytes UTF-16 */  in cifs_from_utf16()
188 	 * because the chars can be of varying widths, we need to take care  in cifs_from_utf16()
190 	 * end of it. Until we get to this offset, we don't need to check  in cifs_from_utf16()
193 	safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);  in cifs_from_utf16()
210 		 * conversion bleed into the null terminator  in cifs_from_utf16()
214 			if ((outlen + charlen) > (tolen - nullsize))  in cifs_from_utf16()
222 		/* charlen (=bytes of UTF-8 for 1 character)  in cifs_from_utf16()
223 		 * 4bytes UTF-8(surrogate pair) is charlen=4  in cifs_from_utf16()
224 		 *   (4bytes UTF-16 code)  in cifs_from_utf16()
225 		 * 7-8bytes UTF-8(IVS) is charlen=3+4 or 4+4  in cifs_from_utf16()
226 		 *   (2 UTF-8 pairs divided to 2 UTF-16 pairs) */  in cifs_from_utf16()
230 			/* 5-6bytes UTF-8 */  in cifs_from_utf16()
234 	/* properly null-terminate string */  in cifs_from_utf16()
256 	if (!strcmp(codepage->charset, "utf8")) {  in cifs_strtoUTF16()
258 		 * convert utf8 -> utf16, we assume we have enough space  in cifs_strtoUTF16()
259 		 * as caller should have assumed conversion does not overflow  in cifs_strtoUTF16()
276 	for (i = 0; len && *from; i++, from += charlen, len -= charlen) {  in cifs_strtoUTF16()
277 		charlen = codepage->char2uni(from, len, &wchar_to);  in cifs_strtoUTF16()
279 			cifs_dbg(VFS, "strtoUTF16: char2uni of 0x%x returned %d\n",  in cifs_strtoUTF16()
294  * cifs_utf16_bytes - how long will a string be after conversion?
295  * @utf16 - pointer to input string
296  * @maxbytes - don't go past this many bytes of input string
297  * @codepage - destination codepage
299  * Walk a utf16le string and return the number of bytes that the string will
334  * cifs_strndup_from_utf16 - copy a string from wire format to the local
336  * @src - source string
337  * @maxlen - don't walk past this many bytes in the source string
338  * @is_unicode - is this a unicode string?
339  * @codepage - destination codepage
448  * page. Conversion may involve remapping up the six characters that are
449  * only legal in POSIX-like OS (if they are present in the string). Path
461 	wchar_t *wchar_to;	/* UTF-16 */  in cifsConvertToUTF16()
474 		/* check if end of string */  in cifsConvertToUTF16()
485 			 * Remap spaces and periods found at the end of every  in cifsConvertToUTF16()
486 			 * component of the path. The special cases of '.' and  in cifsConvertToUTF16()
487 			 * '..' are need to be handled because of symlinks.  in cifsConvertToUTF16()
488 			 * They are treated as non-end-of-string to avoid  in cifsConvertToUTF16()
491 			if ((i == 0 || source[i-1] == '\\') &&  in cifsConvertToUTF16()
493 			    (i == srclen-1 || source[i+1] == '\\'))  in cifsConvertToUTF16()
496 				 (i == 1 || source[i-2] == '\\') &&  in cifsConvertToUTF16()
497 				 source[i-1] == '.' &&  in cifsConvertToUTF16()
499 				 (i == srclen-1 || source[i+1] == '\\'))  in cifsConvertToUTF16()
501 			else if ((i == srclen - 1) || (source[i+1] == '\\'))  in cifsConvertToUTF16()
515 			charlen = cp->char2uni(source + i, srclen - i, &tmp);  in cifsConvertToUTF16()
526 			if (strcmp(cp->charset, "utf8") || !wchar_to)  in cifsConvertToUTF16()
543 				/* 1-3bytes UTF-8 to 2bytes UTF-16 */  in cifsConvertToUTF16()
546 				/* 4bytes UTF-8(surrogate pair) to 4bytes UTF-16  in cifsConvertToUTF16()
547 				 * 7-8bytes UTF-8(IVS) divided to 2 UTF-16  in cifsConvertToUTF16()
554 				/* 5-6bytes UTF-8 to 6bytes UTF-16 */  in cifsConvertToUTF16()
586  * cifs_local_to_utf16_bytes - how long will a string be after conversion?
587  * @from - pointer to input string
588  * @maxbytes - don't go past this many bytes of input string
589  * @codepage - source codepage
591  * Walk a string and return the number of bytes that the string will
604 	for (i = 0; len && *from; i++, from += charlen, len -= charlen) {  in cifs_local_to_utf16_bytes()
605 		charlen = codepage->char2uni(from, len, &wchar_to);  in cifs_local_to_utf16_bytes()
606 		/* Failed conversion defaults to a question mark */  in cifs_local_to_utf16_bytes()
614  * cifs_strndup_to_utf16 - copy a string to wire format from the local codepage
615  * @src - source string
616  * @maxlen - don't walk past this many bytes in the source string
617  * @utf16_len - the length of the allocated string in bytes (including null)
618  * @cp - source codepage
619  * @remap - map special chars