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 #include "mbfilter.h"
27 #include "mbfilter_cp850.h"
28 #include "unicode_table_cp850.h"
29
30 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter);
31
32 static const char *mbfl_encoding_cp850_aliases[] = {"CP850", "CP-850", "IBM850", "IBM-850", NULL};
33
34 const mbfl_encoding mbfl_encoding_cp850 = {
35 mbfl_no_encoding_cp850,
36 "CP850",
37 "CP850",
38 (const char *(*)[])&mbfl_encoding_cp850_aliases,
39 NULL,
40 MBFL_ENCTYPE_SBCS,
41 &vtbl_cp850_wchar,
42 &vtbl_wchar_cp850
43 };
44
45 const struct mbfl_identify_vtbl vtbl_identify_cp850 = {
46 mbfl_no_encoding_cp850,
47 mbfl_filt_ident_common_ctor,
48 mbfl_filt_ident_cp850
49 };
50
51 const struct mbfl_convert_vtbl vtbl_wchar_cp850 = {
52 mbfl_no_encoding_wchar,
53 mbfl_no_encoding_cp850,
54 mbfl_filt_conv_common_ctor,
55 NULL,
56 mbfl_filt_conv_wchar_cp850,
57 mbfl_filt_conv_common_flush,
58 NULL,
59 };
60
61 const struct mbfl_convert_vtbl vtbl_cp850_wchar = {
62 mbfl_no_encoding_cp850,
63 mbfl_no_encoding_wchar,
64 mbfl_filt_conv_common_ctor,
65 NULL,
66 mbfl_filt_conv_cp850_wchar,
67 mbfl_filt_conv_common_flush,
68 NULL,
69 };
70
71 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
72
73 /*
74 * cp850 => wchar
75 */
76 int
mbfl_filt_conv_cp850_wchar(int c,mbfl_convert_filter * filter)77 mbfl_filt_conv_cp850_wchar(int c, mbfl_convert_filter *filter)
78 {
79 int s;
80
81 if (c >= 0 && c < cp850_ucs_table_min) {
82 s = c;
83 } else if (c >= cp850_ucs_table_min && c < 0x100) {
84 s = cp850_ucs_table[c - cp850_ucs_table_min];
85 if (s <= 0) {
86 s = c;
87 s &= MBFL_WCSPLANE_MASK;
88 s |= MBFL_WCSPLANE_CP850;
89 }
90 } else {
91 s = c;
92 s &= MBFL_WCSGROUP_MASK;
93 s |= MBFL_WCSGROUP_THROUGH;
94 }
95
96 CK((*filter->output_function)(s, filter->data));
97
98 return c;
99 }
100
101 /*
102 * wchar => cp850
103 */
104 int
mbfl_filt_conv_wchar_cp850(int c,mbfl_convert_filter * filter)105 mbfl_filt_conv_wchar_cp850(int c, mbfl_convert_filter *filter)
106 {
107 int s, n;
108
109 if (c < 0x80) {
110 s = c;
111 } else {
112 s = -1;
113 n = cp850_ucs_table_len-1;
114 while (n >= 0) {
115 if (c == cp850_ucs_table[n]) {
116 s = cp850_ucs_table_min + n;
117 break;
118 }
119 n--;
120 }
121 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP850) {
122 s = c & MBFL_WCSPLANE_MASK;
123 }
124 }
125
126 if (s >= 0) {
127 CK((*filter->output_function)(s, filter->data));
128 } else {
129 CK(mbfl_filt_conv_illegal_output(c, filter));
130 }
131
132 return c;
133 }
134
mbfl_filt_ident_cp850(int c,mbfl_identify_filter * filter)135 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter)
136 {
137 if (c >= 0x80 && c < 0xff)
138 filter->flag = 0;
139 else
140 filter->flag = 1; /* not it */
141 return c;
142 }
143
