ntfs_conv.c revision 1.1 
1/*	$Id: ntfs_conv.c,v 1.1 2003/05/20 03:03:27 tedu Exp $	*/
2/*	$NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $	*/
3
4/*-
5 * Copyright (c) 2001 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the NetBSD
19 *	Foundation, Inc. and its contributors.
20 * 4. Neither the name of The NetBSD Foundation nor the names of its
21 *    contributors may be used to endorse or promote products derived
22 *    from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37/*
38 * File name recode stuff.
39 *
40 * The utf-8 routines were derived from basesrc/lib/libc/locale/utf2.c.
41 */
42
43#include <sys/cdefs.h>
44#ifdef __KERNEL_RCSID
45__KERNEL_RCSID(0, "$NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $");
46#endif
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/namei.h>
51#include <sys/proc.h>
52#include <sys/kernel.h>
53#include <sys/vnode.h>
54#include <sys/mount.h>
55#include <sys/buf.h>
56#include <sys/file.h>
57#include <sys/malloc.h>
58#include <sys/lock.h>
59#if defined(__FreeBSD__)
60#include <machine/clock.h>
61#endif
62
63#include <miscfs/specfs/specdev.h>
64
65/* #define NTFS_DEBUG 1 */
66#if defined(__FreeBSD__) || defined(__NetBSD__)
67#include <fs/ntfs/ntfs.h>
68#include <fs/ntfs/ntfsmount.h>
69#include <fs/ntfs/ntfs_inode.h>
70#include <fs/ntfs/ntfs_vfsops.h>
71#include <fs/ntfs/ntfs_subr.h>
72#include <fs/ntfs/ntfs_compr.h>
73#include <fs/ntfs/ntfs_ihash.h>
74#else
75#include <ntfs/ntfs.h>
76#include <ntfs/ntfsmount.h>
77#include <ntfs/ntfs_inode.h>
78#include <ntfs/ntfs_vfsops.h>
79#include <ntfs/ntfs_subr.h>
80#include <ntfs/ntfs_compr.h>
81#include <ntfs/ntfs_ihash.h>
82#endif
83
84/* UTF-8 encoding stuff */
85
86static const int _utf_count[16] = {
87        1, 1, 1, 1, 1, 1, 1, 1,
88        0, 0, 0, 0, 2, 2, 3, 0,
89};
90
91/*
92 * Read one wide character off the string, shift the string pointer
93 * and return the character.
94 */
95wchar
96ntfs_utf8_wget(const char **str)
97{
98	int c;
99	wchar rune = 0;
100	const char *s = *str;
101
102	c = _utf_count[(s[0] >> 4) & 0xf];
103	if (c == 0) {
104		c = 1;
105		goto encoding_error;
106	}
107
108	switch (c) {
109	case 1:
110		rune = s[0] & 0xff;
111		break;
112	case 2:
113		if ((s[1] & 0xc0) != 0x80)
114			goto encoding_error;
115		rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
116		break;
117	case 3:
118		if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
119			goto encoding_error;
120		rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6)
121		    | (s[2] & 0x3F);
122		break;
123	}
124
125encoding_error:
126	*str = *str + c;
127	return rune;
128}
129
130/*
131 * Encode wide character and write it to the string. 'n' specifies
132 * how much space there is in the string. Returns number of bytes written
133 * to the target string.
134 */
135int
136ntfs_utf8_wput(char *s, size_t n, wchar wc)
137{
138        if (wc & 0xf800) {
139                if (n < 3) {
140                        /* bound check failure */
141			ddprintf(("ntfs_utf8_wput: need 3 bytes\n"));
142                        return 0;
143                }
144
145                s[0] = 0xE0 | ((wc >> 12) & 0x0F);
146                s[1] = 0x80 | ((wc >> 6) & 0x3F);
147                s[2] = 0x80 | ((wc) & 0x3F);
148                return 3;
149        } else {
150                if (wc & 0x0780) {
151                        if (n < 2) {
152                                /* bound check failure */
153				ddprintf(("ntfs_utf8_wput: need 2 bytes\n"));
154                                return 0;
155                        }
156
157                        s[0] = 0xC0 | ((wc >> 6) & 0x1F);
158                        s[1] = 0x80 | ((wc) & 0x3F);
159                        return 2;
160                } else {
161                        if (n < 1) {
162                                /* bound check failure */
163				ddprintf(("ntfs_utf8_wput: need 1 byte\n"));
164                                return 0;
165                        }
166
167                        s[0] = wc;
168                        return 1;
169                }
170        }
171}
172
173/*
174 * Compare two wide characters, returning 1, 0, -1 if the first is
175 * bigger, equal or lower than the second.
176 */
177int
178ntfs_utf8_wcmp(wchar wc1, wchar wc2)
179{
180	/* no conversions needed for utf8 */
181
182	if (wc1 == wc2)
183		return 0;
184	else
185		return (int) wc1 - (int) wc2;
186}
187