1 /* $OpenBSD: ntfs_conv.c,v 1.9 2013/11/24 16:02:30 jsing 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 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * File name recode stuff.
32 *
33 * The utf-8 routines were derived from src/lib/libc/locale/utf2.c.
34 */
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/namei.h>
39 #include <sys/mount.h>
40
41 /* #define NTFS_DEBUG 1 */
42 #include <ntfs/ntfs.h>
43 #include <ntfs/ntfs_inode.h>
44 #include <ntfs/ntfs_subr.h>
45
46 /* UTF-8 encoding stuff */
47
48 static const int _utf_count[16] = {
49 1, 1, 1, 1, 1, 1, 1, 1,
50 0, 0, 0, 0, 2, 2, 3, 0,
51 };
52
53 /*
54 * Read one wide character off the string, shift the string pointer
55 * and return the character.
56 */
57 wchar
ntfs_utf8_wget(const char ** str)58 ntfs_utf8_wget(const char **str)
59 {
60 int c;
61 wchar rune = 0;
62 const char *s = *str;
63
64 c = _utf_count[(s[0] >> 4) & 0xf];
65 if (c == 0) {
66 c = 1;
67 goto encoding_error;
68 }
69
70 switch (c) {
71 case 1:
72 rune = s[0] & 0xff;
73 break;
74 case 2:
75 if ((s[1] & 0xc0) != 0x80)
76 goto encoding_error;
77 rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
78 break;
79 case 3:
80 if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
81 goto encoding_error;
82 rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6) |
83 (s[2] & 0x3F);
84 break;
85 }
86
87 encoding_error:
88 *str = *str + c;
89 return rune;
90 }
91
92 /*
93 * Encode wide character and write it to the string. 'n' specifies
94 * how much space there is in the string. Returns number of bytes written
95 * to the target string.
96 */
97 int
ntfs_utf8_wput(char * s,size_t n,wchar wc)98 ntfs_utf8_wput(char *s, size_t n, wchar wc)
99 {
100 if (wc & 0xf800) {
101 if (n < 3) {
102 /* bound check failure */
103 DDPRINTF("ntfs_utf8_wput: need 3 bytes\n");
104 return 0;
105 }
106
107 s[0] = 0xE0 | ((wc >> 12) & 0x0F);
108 s[1] = 0x80 | ((wc >> 6) & 0x3F);
109 s[2] = 0x80 | ((wc) & 0x3F);
110 return 3;
111 } else {
112 if (wc & 0x0780) {
113 if (n < 2) {
114 /* bound check failure */
115 DDPRINTF("ntfs_utf8_wput: need 2 bytes\n");
116 return 0;
117 }
118
119 s[0] = 0xC0 | ((wc >> 6) & 0x1F);
120 s[1] = 0x80 | ((wc) & 0x3F);
121 return 2;
122 } else {
123 if (n < 1) {
124 /* bound check failure */
125 DDPRINTF("ntfs_utf8_wput: need 1 byte\n");
126 return 0;
127 }
128
129 s[0] = wc;
130 return 1;
131 }
132 }
133 }
134
135 /*
136 * Compare two wide characters, returning 1, 0, -1 if the first is
137 * bigger, equal or lower than the second.
138 */
139 int
ntfs_utf8_wcmp(wchar wc1,wchar wc2)140 ntfs_utf8_wcmp(wchar wc1, wchar wc2)
141 {
142 /* no conversions needed for utf8 */
143
144 if (wc1 == wc2)
145 return 0;
146 else
147 return (int) wc1 - (int) wc2;
148 }
149