1/* Access functions for CNS 11643, plane 1 handling.
2 Copyright (C) 1998-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <stdint.h>
21#include <gconv.h>
22
23/* Table for CNS 11643, plane 1 to UCS4 conversion. */
24extern const uint16_t __cns11643l1_to_ucs4_tab[];
25
26
27static inline uint32_t
28__attribute ((always_inline))
29cns11643l1_to_ucs4 (const unsigned char **s, size_t avail,
30 unsigned char offset)
31{
32 unsigned char ch = *(*s);
33 unsigned char ch2;
34 int idx;
35
36 if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
37 return __UNKNOWN_10646_CHAR;
38
39 if (avail < 2)
40 return 0;
41
42 ch2 = (*s)[1];
43 if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
44 return __UNKNOWN_10646_CHAR;
45
46 idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
47 if (idx > 0x21f2)
48 return __UNKNOWN_10646_CHAR;
49
50 (*s) += 2;
51
52 return __cns11643l1_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
53}
54
55
56/* Tables for the UCS4 -> CNS conversion. */
57extern const char __cns11643l1_from_ucs4_tab1[][2];
58extern const char __cns11643l1_from_ucs4_tab2[][2];
59extern const char __cns11643l1_from_ucs4_tab3[][2];
60extern const char __cns11643l1_from_ucs4_tab4[][2];
61extern const char __cns11643l1_from_ucs4_tab5[][2];
62extern const char __cns11643l1_from_ucs4_tab6[][2];
63extern const char __cns11643l1_from_ucs4_tab7[][2];
64extern const char __cns11643l1_from_ucs4_tab8[][2];
65extern const char __cns11643l1_from_ucs4_tab9[][2];
66extern const char __cns11643l1_from_ucs4_tab10[][2];
67extern const char __cns11643l1_from_ucs4_tab11[][2];
68extern const char __cns11643l1_from_ucs4_tab12[][2];
69extern const char __cns11643l1_from_ucs4_tab13[][2];
70extern const char __cns11643l1_from_ucs4_tab14[][2];
71
72
73static inline size_t
74__attribute ((always_inline))
75ucs4_to_cns11643l1 (uint32_t wch, unsigned char *s, size_t avail)
76{
77 unsigned int ch = (unsigned int) wch;
78 char buf[2];
79 const char *cp = buf;
80
81 switch (ch)
82 {
83 case 0xa7 ... 0xf7:
84 cp = __cns11643l1_from_ucs4_tab1[ch - 0xa7];
85 break;
86 case 0x2c7 ... 0x2d9:
87 cp = __cns11643l1_from_ucs4_tab2[ch - 0x2c7];
88 break;
89 case 0x391 ... 0x3c9:
90 cp = __cns11643l1_from_ucs4_tab3[ch - 0x391];
91 break;
92 case 0x2013 ... 0x203e:
93 cp = __cns11643l1_from_ucs4_tab4[ch - 0x2013];
94 break;
95 case 0x2103:
96 cp = "\x22\x6a";
97 break;
98 case 0x2105:
99 cp = "\x22\x22";
100 break;
101 case 0x2109:
102 cp = "\x22\x6b";
103 break;
104 case 0x2160 ... 0x2169:
105 buf[0] = '\x24';
106 buf[1] = '\x2b' + (ch - 0x2160);
107 break;
108 case 0x2170 ... 0x2179:
109 buf[0] = '\x26';
110 buf[1] = '\x35' + (ch - 0x2170);
111 break;
112 case 0x2190 ... 0x2199:
113 cp = __cns11643l1_from_ucs4_tab5[ch - 0x2190];
114 break;
115 case 0x2215 ... 0x2267:
116 cp = __cns11643l1_from_ucs4_tab6[ch - 0x2215];
117 break;
118 case 0x22a5:
119 cp = "\x22\x47";
120 break;
121 case 0x22bf:
122 cp = "\x22\x4a";
123 break;
124 case 0x2400 ... 0x2421:
125 cp = __cns11643l1_from_ucs4_tab7[ch - 0x2400];
126 break;
127 case 0x2460 ... 0x247d:
128 cp = __cns11643l1_from_ucs4_tab8[ch - 0x2460];
129 break;
130 case 0x2500 ... 0x2642:
131 cp = __cns11643l1_from_ucs4_tab9[ch - 0x2500];
132 break;
133 case 0x3000 ... 0x3029:
134 cp = __cns11643l1_from_ucs4_tab10[ch - 0x3000];
135 break;
136 case 0x30fb:
137 cp = "\x21\x26";
138 break;
139 case 0x3105 ... 0x3129:
140 buf[0] = '\x25';
141 buf[1] = '\x47' + (ch - 0x3105);
142 break;
143 case 0x32a3:
144 cp = "\x22\x21";
145 break;
146 case 0x338e ... 0x33d5:
147 cp = __cns11643l1_from_ucs4_tab11[ch - 0x338e];
148 break;
149 case 0x4e00 ... 0x9f9c:
150 cp = __cns11643l1_from_ucs4_tab12[ch - 0x4e00];
151 break;
152 case 0xfe30 ... 0xfe6b:
153 cp = __cns11643l1_from_ucs4_tab13[ch - 0xfe30];
154 break;
155 case 0xff01 ... 0xff5d:
156 cp = __cns11643l1_from_ucs4_tab14[ch - 0xff01];
157 break;
158 case 0xffe0:
159 cp = "\x22\x66";
160 break;
161 case 0xffe1:
162 cp = "\x22\x67";
163 break;
164 case 0xffe5:
165 cp = "\x22\x64";
166 break;
167 default:
168 return __UNKNOWN_10646_CHAR;
169 }
170
171 if (cp[0] == '\0')
172 return __UNKNOWN_10646_CHAR;
173
174 if (avail < 2)
175 return 0;
176
177 s[0] = cp[0];
178 s[1] = cp[1];
179
180 return 2;
181}
182