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24d56127 | 1 | /* Conversion UTF-8 to UCS-4. |
61cd9dc9 | 2 | Copyright (C) 2001-2002, 2006-2007, 2009-2010 Free Software Foundation, Inc. |
24d56127 LC |
3 | Written by Bruno Haible <bruno@clisp.org>, 2001. |
4 | ||
5 | This program is free software: you can redistribute it and/or modify it | |
6 | under the terms of the GNU Lesser General Public License as published | |
7 | by the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <config.h> | |
19 | ||
20 | /* Specification. */ | |
21 | #include "unistr.h" | |
22 | ||
23 | #if defined IN_LIBUNISTRING || HAVE_INLINE | |
24 | ||
25 | int | |
26 | u8_mbtouc_aux (ucs4_t *puc, const uint8_t *s, size_t n) | |
27 | { | |
28 | uint8_t c = *s; | |
29 | ||
30 | if (c >= 0xc2) | |
31 | { | |
32 | if (c < 0xe0) | |
1cd4fffc LC |
33 | { |
34 | if (n >= 2) | |
35 | { | |
36 | if ((s[1] ^ 0x80) < 0x40) | |
37 | { | |
38 | *puc = ((unsigned int) (c & 0x1f) << 6) | |
39 | | (unsigned int) (s[1] ^ 0x80); | |
40 | return 2; | |
41 | } | |
42 | /* invalid multibyte character */ | |
43 | } | |
44 | else | |
45 | { | |
46 | /* incomplete multibyte character */ | |
47 | *puc = 0xfffd; | |
48 | return n; | |
49 | } | |
50 | } | |
24d56127 | 51 | else if (c < 0xf0) |
1cd4fffc LC |
52 | { |
53 | if (n >= 3) | |
54 | { | |
55 | if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 | |
56 | && (c >= 0xe1 || s[1] >= 0xa0) | |
57 | && (c != 0xed || s[1] < 0xa0)) | |
58 | { | |
59 | *puc = ((unsigned int) (c & 0x0f) << 12) | |
60 | | ((unsigned int) (s[1] ^ 0x80) << 6) | |
61 | | (unsigned int) (s[2] ^ 0x80); | |
62 | return 3; | |
63 | } | |
64 | /* invalid multibyte character */ | |
65 | } | |
66 | else | |
67 | { | |
68 | /* incomplete multibyte character */ | |
69 | *puc = 0xfffd; | |
70 | return n; | |
71 | } | |
72 | } | |
24d56127 | 73 | else if (c < 0xf8) |
1cd4fffc LC |
74 | { |
75 | if (n >= 4) | |
76 | { | |
77 | if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 | |
78 | && (s[3] ^ 0x80) < 0x40 | |
79 | && (c >= 0xf1 || s[1] >= 0x90) | |
24d56127 | 80 | #if 1 |
1cd4fffc | 81 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) |
24d56127 | 82 | #endif |
1cd4fffc LC |
83 | ) |
84 | { | |
85 | *puc = ((unsigned int) (c & 0x07) << 18) | |
86 | | ((unsigned int) (s[1] ^ 0x80) << 12) | |
87 | | ((unsigned int) (s[2] ^ 0x80) << 6) | |
88 | | (unsigned int) (s[3] ^ 0x80); | |
89 | return 4; | |
90 | } | |
91 | /* invalid multibyte character */ | |
92 | } | |
93 | else | |
94 | { | |
95 | /* incomplete multibyte character */ | |
96 | *puc = 0xfffd; | |
97 | return n; | |
98 | } | |
99 | } | |
24d56127 LC |
100 | #if 0 |
101 | else if (c < 0xfc) | |
1cd4fffc LC |
102 | { |
103 | if (n >= 5) | |
104 | { | |
105 | if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 | |
106 | && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 | |
107 | && (c >= 0xf9 || s[1] >= 0x88)) | |
108 | { | |
109 | *puc = ((unsigned int) (c & 0x03) << 24) | |
110 | | ((unsigned int) (s[1] ^ 0x80) << 18) | |
111 | | ((unsigned int) (s[2] ^ 0x80) << 12) | |
112 | | ((unsigned int) (s[3] ^ 0x80) << 6) | |
113 | | (unsigned int) (s[4] ^ 0x80); | |
114 | return 5; | |
115 | } | |
116 | /* invalid multibyte character */ | |
117 | } | |
118 | else | |
119 | { | |
120 | /* incomplete multibyte character */ | |
121 | *puc = 0xfffd; | |
122 | return n; | |
123 | } | |
124 | } | |
24d56127 | 125 | else if (c < 0xfe) |
1cd4fffc LC |
126 | { |
127 | if (n >= 6) | |
128 | { | |
129 | if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 | |
130 | && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 | |
131 | && (s[5] ^ 0x80) < 0x40 | |
132 | && (c >= 0xfd || s[1] >= 0x84)) | |
133 | { | |
134 | *puc = ((unsigned int) (c & 0x01) << 30) | |
135 | | ((unsigned int) (s[1] ^ 0x80) << 24) | |
136 | | ((unsigned int) (s[2] ^ 0x80) << 18) | |
137 | | ((unsigned int) (s[3] ^ 0x80) << 12) | |
138 | | ((unsigned int) (s[4] ^ 0x80) << 6) | |
139 | | (unsigned int) (s[5] ^ 0x80); | |
140 | return 6; | |
141 | } | |
142 | /* invalid multibyte character */ | |
143 | } | |
144 | else | |
145 | { | |
146 | /* incomplete multibyte character */ | |
147 | *puc = 0xfffd; | |
148 | return n; | |
149 | } | |
150 | } | |
24d56127 LC |
151 | #endif |
152 | } | |
153 | /* invalid multibyte character */ | |
154 | *puc = 0xfffd; | |
155 | return 1; | |
156 | } | |
157 | ||
158 | #endif |