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 &vtbl_cp850_wchar,
46 &vtbl_wchar_cp850
47 };
48
49 const struct mbfl_identify_vtbl vtbl_identify_cp850 = {
50 mbfl_no_encoding_cp850,
51 mbfl_filt_ident_common_ctor,
52 mbfl_filt_ident_common_dtor,
53 mbfl_filt_ident_cp850
54 };
55
56 const struct mbfl_convert_vtbl vtbl_wchar_cp850 = {
57 mbfl_no_encoding_wchar,
58 mbfl_no_encoding_cp850,
59 mbfl_filt_conv_common_ctor,
60 mbfl_filt_conv_common_dtor,
61 mbfl_filt_conv_wchar_cp850,
62 mbfl_filt_conv_common_flush
63 };
64
65 const struct mbfl_convert_vtbl vtbl_cp850_wchar = {
66 mbfl_no_encoding_cp850,
67 mbfl_no_encoding_wchar,
68 mbfl_filt_conv_common_ctor,
69 mbfl_filt_conv_common_dtor,
70 mbfl_filt_conv_cp850_wchar,
71 mbfl_filt_conv_common_flush
72 };
73
74 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
75
76 /*
77 * cp850 => wchar
78 */
79 int
mbfl_filt_conv_cp850_wchar(int c,mbfl_convert_filter * filter)80 mbfl_filt_conv_cp850_wchar(int c, mbfl_convert_filter *filter)
81 {
82 int s;
83
84 if (c >= 0 && c < cp850_ucs_table_min) {
85 s = c;
86 } else if (c >= cp850_ucs_table_min && c < 0x100) {
87 s = cp850_ucs_table[c - cp850_ucs_table_min];
88 if (s <= 0) {
89 s = c;
90 s &= MBFL_WCSPLANE_MASK;
91 s |= MBFL_WCSPLANE_CP850;
92 }
93 } else {
94 s = c;
95 s &= MBFL_WCSGROUP_MASK;
96 s |= MBFL_WCSGROUP_THROUGH;
97 }
98
99 CK((*filter->output_function)(s, filter->data));
100
101 return c;
102 }
103
104 /*
105 * wchar => cp850
106 */
107 int
mbfl_filt_conv_wchar_cp850(int c,mbfl_convert_filter * filter)108 mbfl_filt_conv_wchar_cp850(int c, mbfl_convert_filter *filter)
109 {
110 int s, n;
111
112 if (c < 0x80) {
113 s = c;
114 } else {
115 s = -1;
116 n = cp850_ucs_table_len-1;
117 while (n >= 0) {
118 if (c == cp850_ucs_table[n]) {
119 s = cp850_ucs_table_min + n;
120 break;
121 }
122 n--;
123 }
124 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP850) {
125 s = c & MBFL_WCSPLANE_MASK;
126 }
127 }
128
129 if (s >= 0) {
130 CK((*filter->output_function)(s, filter->data));
131 } else {
132 CK(mbfl_filt_conv_illegal_output(c, filter));
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
