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: Den V. Tsopa <tdv@edisoft.ru>
22 * Adaption for CP850: D. Giffeler <dg@artegic.de>
23 *
24 */
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include "mbfilter.h"
31 #include "mbfilter_cp850.h"
32 #include "unicode_table_cp850.h"
33
34 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter);
35
36 static const char *mbfl_encoding_cp850_aliases[] = {"CP850", "CP-850", "IBM850", "IBM-850", NULL};
37
38 const mbfl_encoding mbfl_encoding_cp850 = {
39 mbfl_no_encoding_cp850,
40 "CP850",
41 "CP850",
42 (const char *(*)[])&mbfl_encoding_cp850_aliases,
43 NULL,
44 MBFL_ENCTYPE_SBCS
45 };
46
47 const struct mbfl_identify_vtbl vtbl_identify_cp850 = {
48 mbfl_no_encoding_cp850,
49 mbfl_filt_ident_common_ctor,
50 mbfl_filt_ident_common_dtor,
51 mbfl_filt_ident_cp850
52 };
53
54 const struct mbfl_convert_vtbl vtbl_wchar_cp850 = {
55 mbfl_no_encoding_wchar,
56 mbfl_no_encoding_cp850,
57 mbfl_filt_conv_common_ctor,
58 mbfl_filt_conv_common_dtor,
59 mbfl_filt_conv_wchar_cp850,
60 mbfl_filt_conv_common_flush
61 };
62
63 const struct mbfl_convert_vtbl vtbl_cp850_wchar = {
64 mbfl_no_encoding_cp850,
65 mbfl_no_encoding_wchar,
66 mbfl_filt_conv_common_ctor,
67 mbfl_filt_conv_common_dtor,
68 mbfl_filt_conv_cp850_wchar,
69 mbfl_filt_conv_common_flush
70 };
71
72 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
73
74 /*
75 * cp850 => wchar
76 */
77 int
mbfl_filt_conv_cp850_wchar(int c,mbfl_convert_filter * filter)78 mbfl_filt_conv_cp850_wchar(int c, mbfl_convert_filter *filter)
79 {
80 int s;
81
82 if (c >= 0 && c < cp850_ucs_table_min) {
83 s = c;
84 } else if (c >= cp850_ucs_table_min && c < 0x100) {
85 s = cp850_ucs_table[c - cp850_ucs_table_min];
86 if (s <= 0) {
87 s = c;
88 s &= MBFL_WCSPLANE_MASK;
89 s |= MBFL_WCSPLANE_CP850;
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 => cp850
104 */
105 int
mbfl_filt_conv_wchar_cp850(int c,mbfl_convert_filter * filter)106 mbfl_filt_conv_wchar_cp850(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 = cp850_ucs_table_len-1;
115 while (n >= 0) {
116 if (c == cp850_ucs_table[n]) {
117 s = cp850_ucs_table_min + n;
118 break;
119 }
120 n--;
121 }
122 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP850) {
123 s = c & MBFL_WCSPLANE_MASK;
124 }
125 }
126
127 if (s >= 0) {
128 CK((*filter->output_function)(s, filter->data));
129 } else {
130 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
131 CK(mbfl_filt_conv_illegal_output(c, filter));
132 }
133 }
134
135 return c;
136 }
137
mbfl_filt_ident_cp850(int c,mbfl_identify_filter * filter)138 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter)
139 {
140 if (c >= 0x80 && c < 0xff)
141 filter->flag = 0;
142 else
143 filter->flag = 1; /* not it */
144 return c;
145 }
146
147
148
