c2ccf53dd0
The existing NLS case conversion routines do not appropriately handle the (now common) case where the local host is using UTF8. This is because nls_utf8 has no support at all for converting a utf8 string between cases and the NLS infrastructure in general cannot handle a multibyte input character. In any case, what we really need for cifs is to emulate how we expect the server to convert the character to upper or lowercase. Thus, even if we had routines that could handle utf8 case conversion, we likely would end up with the wrong result if the name ends up being in the upper planes. This patch adds a new scheme for doing unicode case conversion. The case conversion tables that Microsoft has published for Windows 8 have been converted to a set of lookup tables, and a routine is added to convert a wchar_t from lower to uppercase using those tables. Reported-and-Tested-by: Jan-Marek Glogowski <glogow@fbihome.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
389 lines
9.2 KiB
C
389 lines
9.2 KiB
C
/*
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* cifs_unicode: Unicode kernel case support
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*
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* Function:
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* Convert a unicode character to upper or lower case using
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* compressed tables.
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*
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* Copyright (c) International Business Machines Corp., 2000,2009
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* Notes:
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* These APIs are based on the C library functions. The semantics
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* should match the C functions but with expanded size operands.
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*
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* The upper/lower functions are based on a table created by mkupr.
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* This is a compressed table of upper and lower case conversion.
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*
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*/
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#ifndef _CIFS_UNICODE_H
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#define _CIFS_UNICODE_H
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#include <asm/byteorder.h>
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#include <linux/types.h>
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#include <linux/nls.h>
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#define UNIUPR_NOLOWER /* Example to not expand lower case tables */
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/*
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* Windows maps these to the user defined 16 bit Unicode range since they are
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* reserved symbols (along with \ and /), otherwise illegal to store
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* in filenames in NTFS
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*/
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#define UNI_ASTERISK (__u16) ('*' + 0xF000)
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#define UNI_QUESTION (__u16) ('?' + 0xF000)
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#define UNI_COLON (__u16) (':' + 0xF000)
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#define UNI_GRTRTHAN (__u16) ('>' + 0xF000)
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#define UNI_LESSTHAN (__u16) ('<' + 0xF000)
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#define UNI_PIPE (__u16) ('|' + 0xF000)
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#define UNI_SLASH (__u16) ('\\' + 0xF000)
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/* Just define what we want from uniupr.h. We don't want to define the tables
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* in each source file.
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*/
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#ifndef UNICASERANGE_DEFINED
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struct UniCaseRange {
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wchar_t start;
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wchar_t end;
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signed char *table;
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};
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#endif /* UNICASERANGE_DEFINED */
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#ifndef UNIUPR_NOUPPER
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extern signed char CifsUniUpperTable[512];
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extern const struct UniCaseRange CifsUniUpperRange[];
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#endif /* UNIUPR_NOUPPER */
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#ifndef UNIUPR_NOLOWER
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extern signed char CifsUniLowerTable[512];
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extern const struct UniCaseRange CifsUniLowerRange[];
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#endif /* UNIUPR_NOLOWER */
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#ifdef __KERNEL__
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int cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
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const struct nls_table *codepage, bool mapchar);
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int cifs_utf16_bytes(const __le16 *from, int maxbytes,
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const struct nls_table *codepage);
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int cifs_strtoUTF16(__le16 *, const char *, int, const struct nls_table *);
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char *cifs_strndup_from_utf16(const char *src, const int maxlen,
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const bool is_unicode,
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const struct nls_table *codepage);
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extern int cifsConvertToUTF16(__le16 *target, const char *source, int maxlen,
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const struct nls_table *cp, int mapChars);
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#ifdef CONFIG_CIFS_SMB2
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extern __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
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int *utf16_len, const struct nls_table *cp,
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int remap);
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#endif /* CONFIG_CIFS_SMB2 */
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#endif
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wchar_t cifs_toupper(wchar_t in);
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/*
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* UniStrcat: Concatenate the second string to the first
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*
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* Returns:
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* Address of the first string
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*/
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static inline wchar_t *
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UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
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{
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wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
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while (*ucs1++) ; /* To end of first string */
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ucs1--; /* Return to the null */
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while ((*ucs1++ = *ucs2++)) ; /* copy string 2 over */
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return anchor;
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}
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/*
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* UniStrchr: Find a character in a string
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*
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* Returns:
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* Address of first occurrence of character in string
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* or NULL if the character is not in the string
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*/
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static inline wchar_t *
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UniStrchr(const wchar_t *ucs, wchar_t uc)
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{
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while ((*ucs != uc) && *ucs)
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ucs++;
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if (*ucs == uc)
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return (wchar_t *) ucs;
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return NULL;
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}
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/*
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* UniStrcmp: Compare two strings
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*
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* Returns:
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* < 0: First string is less than second
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* = 0: Strings are equal
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* > 0: First string is greater than second
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*/
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static inline int
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UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
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{
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while ((*ucs1 == *ucs2) && *ucs1) {
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ucs1++;
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ucs2++;
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}
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return (int) *ucs1 - (int) *ucs2;
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}
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/*
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* UniStrcpy: Copy a string
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*/
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static inline wchar_t *
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UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
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{
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wchar_t *anchor = ucs1; /* save the start of result string */
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while ((*ucs1++ = *ucs2++)) ;
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return anchor;
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}
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/*
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* UniStrlen: Return the length of a string (in 16 bit Unicode chars not bytes)
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*/
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static inline size_t
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UniStrlen(const wchar_t *ucs1)
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{
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int i = 0;
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while (*ucs1++)
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i++;
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return i;
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}
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/*
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* UniStrnlen: Return the length (in 16 bit Unicode chars not bytes) of a
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* string (length limited)
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*/
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static inline size_t
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UniStrnlen(const wchar_t *ucs1, int maxlen)
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{
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int i = 0;
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while (*ucs1++) {
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i++;
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if (i >= maxlen)
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break;
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}
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return i;
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}
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/*
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* UniStrncat: Concatenate length limited string
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*/
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static inline wchar_t *
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UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
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{
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wchar_t *anchor = ucs1; /* save pointer to string 1 */
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while (*ucs1++) ;
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ucs1--; /* point to null terminator of s1 */
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while (n-- && (*ucs1 = *ucs2)) { /* copy s2 after s1 */
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ucs1++;
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ucs2++;
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}
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*ucs1 = 0; /* Null terminate the result */
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return (anchor);
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}
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/*
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* UniStrncmp: Compare length limited string
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*/
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static inline int
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UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
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{
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if (!n)
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return 0; /* Null strings are equal */
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while ((*ucs1 == *ucs2) && *ucs1 && --n) {
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ucs1++;
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ucs2++;
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}
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return (int) *ucs1 - (int) *ucs2;
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}
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/*
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* UniStrncmp_le: Compare length limited string - native to little-endian
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*/
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static inline int
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UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
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{
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if (!n)
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return 0; /* Null strings are equal */
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while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
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ucs1++;
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ucs2++;
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}
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return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
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}
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/*
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* UniStrncpy: Copy length limited string with pad
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*/
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static inline wchar_t *
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UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
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{
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wchar_t *anchor = ucs1;
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while (n-- && *ucs2) /* Copy the strings */
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*ucs1++ = *ucs2++;
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n++;
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while (n--) /* Pad with nulls */
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*ucs1++ = 0;
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return anchor;
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}
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/*
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* UniStrncpy_le: Copy length limited string with pad to little-endian
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*/
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static inline wchar_t *
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UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
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{
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wchar_t *anchor = ucs1;
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while (n-- && *ucs2) /* Copy the strings */
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*ucs1++ = __le16_to_cpu(*ucs2++);
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n++;
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while (n--) /* Pad with nulls */
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*ucs1++ = 0;
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return anchor;
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}
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/*
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* UniStrstr: Find a string in a string
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*
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* Returns:
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* Address of first match found
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* NULL if no matching string is found
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*/
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static inline wchar_t *
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UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
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{
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const wchar_t *anchor1 = ucs1;
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const wchar_t *anchor2 = ucs2;
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while (*ucs1) {
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if (*ucs1 == *ucs2) {
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/* Partial match found */
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ucs1++;
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ucs2++;
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} else {
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if (!*ucs2) /* Match found */
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return (wchar_t *) anchor1;
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ucs1 = ++anchor1; /* No match */
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ucs2 = anchor2;
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}
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}
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if (!*ucs2) /* Both end together */
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return (wchar_t *) anchor1; /* Match found */
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return NULL; /* No match */
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}
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#ifndef UNIUPR_NOUPPER
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/*
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* UniToupper: Convert a unicode character to upper case
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*/
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static inline wchar_t
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UniToupper(register wchar_t uc)
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{
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register const struct UniCaseRange *rp;
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if (uc < sizeof(CifsUniUpperTable)) {
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/* Latin characters */
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return uc + CifsUniUpperTable[uc]; /* Use base tables */
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} else {
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rp = CifsUniUpperRange; /* Use range tables */
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while (rp->start) {
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if (uc < rp->start) /* Before start of range */
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return uc; /* Uppercase = input */
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if (uc <= rp->end) /* In range */
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return uc + rp->table[uc - rp->start];
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rp++; /* Try next range */
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}
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}
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return uc; /* Past last range */
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}
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/*
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* UniStrupr: Upper case a unicode string
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*/
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static inline __le16 *
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UniStrupr(register __le16 *upin)
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{
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register __le16 *up;
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up = upin;
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while (*up) { /* For all characters */
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*up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
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up++;
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}
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return upin; /* Return input pointer */
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}
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#endif /* UNIUPR_NOUPPER */
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#ifndef UNIUPR_NOLOWER
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/*
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* UniTolower: Convert a unicode character to lower case
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*/
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static inline wchar_t
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UniTolower(register wchar_t uc)
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{
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register const struct UniCaseRange *rp;
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if (uc < sizeof(CifsUniLowerTable)) {
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/* Latin characters */
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return uc + CifsUniLowerTable[uc]; /* Use base tables */
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} else {
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rp = CifsUniLowerRange; /* Use range tables */
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while (rp->start) {
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if (uc < rp->start) /* Before start of range */
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return uc; /* Uppercase = input */
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if (uc <= rp->end) /* In range */
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return uc + rp->table[uc - rp->start];
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rp++; /* Try next range */
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}
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}
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return uc; /* Past last range */
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}
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/*
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* UniStrlwr: Lower case a unicode string
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*/
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static inline wchar_t *
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UniStrlwr(register wchar_t *upin)
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{
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register wchar_t *up;
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up = upin;
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while (*up) { /* For all characters */
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*up = UniTolower(*up);
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up++;
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}
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return upin; /* Return input pointer */
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}
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#endif
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#endif /* _CIFS_UNICODE_H */
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