Annotation of embedaddon/php/ext/mbstring/libmbfl/filters/mbfilter_big5.c, revision 1.1.1.1
1.1 misho 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 file: Rui Hirokawa <hirokawa@php.net>
22: *
23: */
24: /*
25: * The source code included in this files was separated from mbfilter_tw.c
26: * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
27: *
28: */
29:
30: #ifdef HAVE_CONFIG_H
31: #include "config.h"
32: #endif
33:
34: #include "mbfilter.h"
35: #include "mbfilter_big5.h"
36:
37: #include "unicode_table_big5.h"
38:
39: static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter);
40:
41: static const unsigned char mblen_table_big5[] = { /* 0x81-0xFE */
42: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
46: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
47: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
48: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
49: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
50: 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
51: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
52: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
53: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
54: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
55: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
56: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
57: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
58: };
59:
60: static const char *mbfl_encoding_big5_aliases[] = {"CN-BIG5", "BIG-FIVE", "BIGFIVE", "CP950", NULL};
61:
62: const mbfl_encoding mbfl_encoding_big5 = {
63: mbfl_no_encoding_big5,
64: "BIG-5",
65: "BIG5",
66: (const char *(*)[])&mbfl_encoding_big5_aliases,
67: mblen_table_big5,
68: MBFL_ENCTYPE_MBCS
69: };
70:
71: const struct mbfl_identify_vtbl vtbl_identify_big5 = {
72: mbfl_no_encoding_big5,
73: mbfl_filt_ident_common_ctor,
74: mbfl_filt_ident_common_dtor,
75: mbfl_filt_ident_big5
76: };
77:
78: const struct mbfl_convert_vtbl vtbl_big5_wchar = {
79: mbfl_no_encoding_big5,
80: mbfl_no_encoding_wchar,
81: mbfl_filt_conv_common_ctor,
82: mbfl_filt_conv_common_dtor,
83: mbfl_filt_conv_big5_wchar,
84: mbfl_filt_conv_common_flush
85: };
86:
87: const struct mbfl_convert_vtbl vtbl_wchar_big5 = {
88: mbfl_no_encoding_wchar,
89: mbfl_no_encoding_big5,
90: mbfl_filt_conv_common_ctor,
91: mbfl_filt_conv_common_dtor,
92: mbfl_filt_conv_wchar_big5,
93: mbfl_filt_conv_common_flush
94: };
95:
96: #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
97:
98: /*
99: * Big5 => wchar
100: */
101: int
102: mbfl_filt_conv_big5_wchar(int c, mbfl_convert_filter *filter)
103: {
104: int c1, w;
105:
106: switch (filter->status) {
107: case 0:
108: if (c >= 0 && c < 0x80) { /* latin */
109: CK((*filter->output_function)(c, filter->data));
110: } else if (c > 0xa0 && c < 0xff) { /* dbcs lead byte */
111: filter->status = 1;
112: filter->cache = c;
113: } else {
114: w = c & MBFL_WCSGROUP_MASK;
115: w |= MBFL_WCSGROUP_THROUGH;
116: CK((*filter->output_function)(w, filter->data));
117: }
118: break;
119:
120: case 1: /* dbcs second byte */
121: filter->status = 0;
122: c1 = filter->cache;
123: if ((c > 0x39 && c < 0x7f) | (c > 0xa0 && c < 0xff)) {
124: if (c < 0x7f){
125: w = (c1 - 0xa1)*157 + (c - 0x40);
126: } else {
127: w = (c1 - 0xa1)*157 + (c - 0xa1) + 0x3f;
128: }
129: if (w >= 0 && w < big5_ucs_table_size) {
130: w = big5_ucs_table[w];
131: } else {
132: w = 0;
133: }
134: if (w <= 0) {
135: w = (c1 << 8) | c;
136: w &= MBFL_WCSPLANE_MASK;
137: w |= MBFL_WCSPLANE_BIG5;
138: }
139: CK((*filter->output_function)(w, filter->data));
140: } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
141: CK((*filter->output_function)(c, filter->data));
142: } else {
143: w = (c1 << 8) | c;
144: w &= MBFL_WCSGROUP_MASK;
145: w |= MBFL_WCSGROUP_THROUGH;
146: CK((*filter->output_function)(w, filter->data));
147: }
148: break;
149:
150: default:
151: filter->status = 0;
152: break;
153: }
154:
155: return c;
156: }
157:
158: /*
159: * wchar => Big5
160: */
161: int
162: mbfl_filt_conv_wchar_big5(int c, mbfl_convert_filter *filter)
163: {
164: int c1, s;
165:
166: s = 0;
167: if (c >= ucs_a1_big5_table_min && c < ucs_a1_big5_table_max) {
168: s = ucs_a1_big5_table[c - ucs_a1_big5_table_min];
169: } else if (c >= ucs_a2_big5_table_min && c < ucs_a2_big5_table_max) {
170: s = ucs_a2_big5_table[c - ucs_a2_big5_table_min];
171: } else if (c >= ucs_a3_big5_table_min && c < ucs_a3_big5_table_max) {
172: s = ucs_a3_big5_table[c - ucs_a3_big5_table_min];
173: } else if (c >= ucs_i_big5_table_min && c < ucs_i_big5_table_max) {
174: s = ucs_i_big5_table[c - ucs_i_big5_table_min];
175: } else if (c >= ucs_pua_big5_table_min && c < ucs_pua_big5_table_max) {
176: s = ucs_pua_big5_table[c - ucs_pua_big5_table_min];
177: } else if (c >= ucs_r1_big5_table_min && c < ucs_r1_big5_table_max) {
178: s = ucs_r1_big5_table[c - ucs_r1_big5_table_min];
179: } else if (c >= ucs_r2_big5_table_min && c < ucs_r2_big5_table_max) {
180: s = ucs_r2_big5_table[c - ucs_r2_big5_table_min];
181: }
182: if (s <= 0) {
183: c1 = c & ~MBFL_WCSPLANE_MASK;
184: if (c1 == MBFL_WCSPLANE_BIG5) {
185: s = c & MBFL_WCSPLANE_MASK;
186: }
187: if (c == 0) {
188: s = 0;
189: } else if (s <= 0) {
190: s = -1;
191: }
192: }
193: if (s >= 0) {
194: if (s < 0x80) { /* latin */
195: CK((*filter->output_function)(s, filter->data));
196: } else {
197: CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
198: CK((*filter->output_function)(s & 0xff, filter->data));
199: }
200: } else {
201: if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
202: CK(mbfl_filt_conv_illegal_output(c, filter));
203: }
204: }
205:
206: return c;
207: }
208:
209: static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter)
210: {
211: if (filter->status) { /* kanji second char */
212: if (c < 0x40 || (c > 0x7e && c < 0xa1) ||c > 0xfe) { /* bad */
213: filter->flag = 1;
214: }
215: filter->status = 0;
216: } else if (c >= 0 && c < 0x80) { /* latin ok */
217: ;
218: } else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
219: filter->status = 1;
220: } else { /* bad */
221: filter->flag = 1;
222: }
223:
224: return c;
225: }
226:
227:
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