1 /*
2 * "streamable kanji code filter and converter"
3 * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
4 *
5 * LICENSE NOTICES
6 *
7 * This file is part of "streamable kanji code filter and converter",
8 * which is distributed under the terms of GNU Lesser General Public
9 * License (version 2) as published by the Free Software Foundation.
10 *
11 * This software 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
14 * GNU 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 "streamable kanji code filter and converter";
18 * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19 * Suite 330, Boston, MA 02111-1307 USA
20 *
21 * The author of this part: Maksym Veremeyenko <verem@m1.tv>
22 *
23 * Based on mbfilter_koi8r.c code
24 *
25 */
26
27 #include "mbfilter.h"
28 #include "mbfilter_koi8u.h"
29 #include "unicode_table_koi8u.h"
30
31 static int mbfl_filt_ident_koi8u(int c, mbfl_identify_filter *filter);
32
33 static const char *mbfl_encoding_koi8u_aliases[] = {"KOI8-U", "KOI8U", NULL};
34
35 const mbfl_encoding mbfl_encoding_koi8u = {
36 mbfl_no_encoding_koi8u,
37 "KOI8-U",
38 "KOI8-U",
39 (const char *(*)[])&mbfl_encoding_koi8u_aliases,
40 NULL,
41 MBFL_ENCTYPE_SBCS,
42 &vtbl_koi8u_wchar,
43 &vtbl_wchar_koi8u
44 };
45
46 const struct mbfl_identify_vtbl vtbl_identify_koi8u = {
47 mbfl_no_encoding_koi8u,
48 mbfl_filt_ident_common_ctor,
49 mbfl_filt_ident_koi8u
50 };
51
52 const struct mbfl_convert_vtbl vtbl_wchar_koi8u = {
53 mbfl_no_encoding_wchar,
54 mbfl_no_encoding_koi8u,
55 mbfl_filt_conv_common_ctor,
56 NULL,
57 mbfl_filt_conv_wchar_koi8u,
58 mbfl_filt_conv_common_flush,
59 NULL,
60 };
61
62 const struct mbfl_convert_vtbl vtbl_koi8u_wchar = {
63 mbfl_no_encoding_koi8u,
64 mbfl_no_encoding_wchar,
65 mbfl_filt_conv_common_ctor,
66 NULL,
67 mbfl_filt_conv_koi8u_wchar,
68 mbfl_filt_conv_common_flush,
69 NULL,
70 };
71
72 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
73
74 /*
75 * koi8u => wchar
76 */
77 int
mbfl_filt_conv_koi8u_wchar(int c,mbfl_convert_filter * filter)78 mbfl_filt_conv_koi8u_wchar(int c, mbfl_convert_filter *filter)
79 {
80 int s;
81
82 if (c >= 0 && c < koi8u_ucs_table_min) {
83 s = c;
84 } else if (c >= koi8u_ucs_table_min && c < 0x100) {
85 s = koi8u_ucs_table[c - koi8u_ucs_table_min];
86 if (s <= 0) {
87 s = c;
88 s &= MBFL_WCSPLANE_MASK;
89 s |= MBFL_WCSPLANE_KOI8U;
90 }
91 } else {
92 s = c;
93 s &= MBFL_WCSGROUP_MASK;
94 s |= MBFL_WCSGROUP_THROUGH;
95 }
96
97 CK((*filter->output_function)(s, filter->data));
98
99 return c;
100 }
101
102 /*
103 * wchar => koi8u
104 */
105 int
mbfl_filt_conv_wchar_koi8u(int c,mbfl_convert_filter * filter)106 mbfl_filt_conv_wchar_koi8u(int c, mbfl_convert_filter *filter)
107 {
108 int s, n;
109
110 if (c < 0x80) {
111 s = c;
112 } else {
113 s = -1;
114 n = koi8u_ucs_table_len-1;
115 while (n >= 0) {
116 if (c == koi8u_ucs_table[n]) {
117 s = koi8u_ucs_table_min + n;
118 break;
119 }
120 n--;
121 }
122 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_KOI8U) {
123 s = c & MBFL_WCSPLANE_MASK;
124 }
125 }
126
127 if (s >= 0) {
128 CK((*filter->output_function)(s, filter->data));
129 } else {
130 CK(mbfl_filt_conv_illegal_output(c, filter));
131 }
132
133 return c;
134 }
135
mbfl_filt_ident_koi8u(int c,mbfl_identify_filter * filter)136 static int mbfl_filt_ident_koi8u(int c, mbfl_identify_filter *filter)
137 {
138 if (c >= 0x80 && c < 0xff)
139 filter->flag = 0;
140 else
141 filter->flag = 1; /* not it */
142 return c;
143 }
144