1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * cifs_unicode: Unicode kernel case support
4 *
5 * Function:
6 * Convert a unicode character to upper or lower case using
7 * compressed tables.
8 *
9 * Copyright (c) International Business Machines Corp., 2000,2009
10 *
11 * Notes:
12 * These APIs are based on the C library functions. The semantics
13 * should match the C functions but with expanded size operands.
14 *
15 * The upper/lower functions are based on a table created by mkupr.
16 * This is a compressed table of upper and lower case conversion.
17 */
18 #ifndef _CIFS_UNICODE_H
19 #define _CIFS_UNICODE_H
20
21 #include <asm/byteorder.h>
22 #include <linux/types.h>
23 #include <linux/nls.h>
24 #include "../../nls/nls_ucs2_utils.h"
25 #include "cifsglob.h"
26
27 /*
28 * Macs use an older "SFM" mapping of the symbols above. Fortunately it does
29 * not conflict (although almost does) with the mapping above.
30 */
31
32 #define SFM_DOUBLEQUOTE ((__u16) 0xF020)
33 #define SFM_ASTERISK ((__u16) 0xF021)
34 #define SFM_QUESTION ((__u16) 0xF025)
35 #define SFM_COLON ((__u16) 0xF022)
36 #define SFM_GRTRTHAN ((__u16) 0xF024)
37 #define SFM_LESSTHAN ((__u16) 0xF023)
38 #define SFM_PIPE ((__u16) 0xF027)
39 #define SFM_SLASH ((__u16) 0xF026)
40 #define SFM_SPACE ((__u16) 0xF028)
41 #define SFM_PERIOD ((__u16) 0xF029)
42
43 /*
44 * Mapping mechanism to use when one of the seven reserved characters is
45 * encountered. We can only map using one of the mechanisms at a time
46 * since otherwise readdir could return directory entries which we would
47 * not be able to open
48 *
49 * NO_MAP_UNI_RSVD = do not perform any remapping of the character
50 * SFM_MAP_UNI_RSVD = map reserved characters using SFM scheme (MAC compatible)
51 * SFU_MAP_UNI_RSVD = map reserved characters ala SFU ("mapchars" option)
52 *
53 */
54 #define NO_MAP_UNI_RSVD 0
55 #define SFM_MAP_UNI_RSVD 1
56 #define SFU_MAP_UNI_RSVD 2
57
58 int cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
59 const struct nls_table *codepage, int map_type);
60 int cifs_utf16_bytes(const __le16 *from, int maxbytes,
61 const struct nls_table *codepage);
62 int cifs_strtoUTF16(__le16 *to, const char *from, int len,
63 const struct nls_table *codepage);
64 char *cifs_strndup_from_utf16(const char *src, const int maxlen,
65 const bool is_unicode,
66 const struct nls_table *codepage);
67 int cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
68 const struct nls_table *cp, int map_chars);
69 __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
70 int *utf16_len, const struct nls_table *cp,
71 int remap);
72 wchar_t cifs_toupper(wchar_t in);
73
cifs_remap(const struct cifs_sb_info * cifs_sb)74 static inline int cifs_remap(const struct cifs_sb_info *cifs_sb)
75 {
76 unsigned int sbflags = cifs_sb_flags(cifs_sb);
77
78 if (sbflags & CIFS_MOUNT_MAP_SFM_CHR)
79 return SFM_MAP_UNI_RSVD;
80 if (sbflags & CIFS_MOUNT_MAP_SPECIAL_CHR)
81 return SFU_MAP_UNI_RSVD;
82
83 return NO_MAP_UNI_RSVD;
84 }
85
86 #endif /* _CIFS_UNICODE_H */
87