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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_euc_tw.h"
36:
37: #include "unicode_table_cns11643.h"
38:
39: static int mbfl_filt_ident_euctw(int c, mbfl_identify_filter *filter);
40:
41: static const unsigned char mblen_table_euctw[] = { /* 0xA1-0xFE */
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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1,
51: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
52: 1, 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:
61: static const char *mbfl_encoding_euc_tw_aliases[] = {"EUC_TW", "eucTW", "x-euc-tw", NULL};
62:
63: const mbfl_encoding mbfl_encoding_euc_tw = {
64: mbfl_no_encoding_euc_tw,
65: "EUC-TW",
66: "EUC-TW",
67: (const char *(*)[])&mbfl_encoding_euc_tw_aliases,
68: mblen_table_euctw,
69: MBFL_ENCTYPE_MBCS
70: };
71:
72: const struct mbfl_identify_vtbl vtbl_identify_euctw = {
73: mbfl_no_encoding_euc_tw,
74: mbfl_filt_ident_common_ctor,
75: mbfl_filt_ident_common_dtor,
76: mbfl_filt_ident_euctw
77: };
78:
79: const struct mbfl_convert_vtbl vtbl_euctw_wchar = {
80: mbfl_no_encoding_euc_tw,
81: mbfl_no_encoding_wchar,
82: mbfl_filt_conv_common_ctor,
83: mbfl_filt_conv_common_dtor,
84: mbfl_filt_conv_euctw_wchar,
85: mbfl_filt_conv_common_flush
86: };
87:
88: const struct mbfl_convert_vtbl vtbl_wchar_euctw = {
89: mbfl_no_encoding_wchar,
90: mbfl_no_encoding_euc_tw,
91: mbfl_filt_conv_common_ctor,
92: mbfl_filt_conv_common_dtor,
93: mbfl_filt_conv_wchar_euctw,
94: mbfl_filt_conv_common_flush
95: };
96:
97: #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
98:
99: /*
100: * EUC-TW => wchar
101: */
102: int
103: mbfl_filt_conv_euctw_wchar(int c, mbfl_convert_filter *filter)
104: {
105: int c1, s, w, plane;
106:
107: switch (filter->status) {
108: case 0:
109: if (c >= 0 && c < 0x80) { /* latin */
110: CK((*filter->output_function)(c, filter->data));
111: } else if (c > 0xa0 && c < 0xff) { /* dbcs first byte */
112: filter->status = 1;
113: filter->cache = c;
114: } else if (c == 0x8e) { /* mbcs first byte */
115: filter->status = 2;
116: filter->cache = c;
117: } else {
118: w = c & MBFL_WCSGROUP_MASK;
119: w |= MBFL_WCSGROUP_THROUGH;
120: CK((*filter->output_function)(w, filter->data));
121: }
122: break;
123:
124: case 1: /* mbcs second byte */
125: filter->status = 0;
126: c1 = filter->cache;
127: if (c > 0xa0 && c < 0xff) {
128: w = (c1 - 0xa1)*94 + (c - 0xa1);
129: if (w >= 0 && w < cns11643_1_ucs_table_size) {
130: w = cns11643_1_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_CNS11643;
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: case 2: /* got 0x8e, first char */
151: c1 = filter->cache;
152: if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
153: CK((*filter->output_function)(c, filter->data));
154: filter->status = 0;
155: } else if (c > 0xa0 && c < 0xaf) {
156: filter->status = 3;
157: filter->cache = c - 0xa1;
158: } else {
159: w = (c1 << 8) | c;
160: w &= MBFL_WCSGROUP_MASK;
161: w |= MBFL_WCSGROUP_THROUGH;
162: CK((*filter->output_function)(w, filter->data));
163: }
164: break;
165:
166: case 3: /* got 0x8e, third char */
167: filter->status = 0;
168: c1 = filter->cache;
169: if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
170: CK((*filter->output_function)(c, filter->data));
171: filter->status = 0;
172: } else if (c > 0xa0 && c < 0xff) {
173: filter->status = 4;
174: filter->cache = (c1 << 8) + c - 0xa1;
175: } else {
176: w = (c1 << 8) | c;
177: w &= MBFL_WCSGROUP_MASK;
178: w |= MBFL_WCSGROUP_THROUGH;
179: CK((*filter->output_function)(w, filter->data));
180: }
181: break;
182:
183: case 4: /* mbcs fourth char */
184: filter->status = 0;
185: c1 = filter->cache;
186: if (c1 >= 0x100 && c1 <= 0xdff && c > 0xa0 && c < 0xff) {
187: plane = (c1 & 0xf00) >> 8;
188: s = (c1 & 0xff)*94 + c - 0xa1;
189: w = 0;
190: if (s >= 0) {
191: if (plane == 1 && s < cns11643_2_ucs_table_size) {
192: w = cns11643_2_ucs_table[s];
193: }
194: if (plane == 13 && s < cns11643_14_ucs_table_size) {
195: w = cns11643_14_ucs_table[s];
196: }
197: }
198: if (w <= 0) {
199: w = ((c1 & 0x7f) << 8) | (c & 0x7f);
200: w &= MBFL_WCSPLANE_MASK;
201: w |= MBFL_WCSPLANE_CNS11643;
202: }
203: CK((*filter->output_function)(w, filter->data));
204: } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
205: CK((*filter->output_function)(c, filter->data));
206: } else {
207: w = (c1 << 8) | c | 0x8e0000;
208: w &= MBFL_WCSGROUP_MASK;
209: w |= MBFL_WCSGROUP_THROUGH;
210: CK((*filter->output_function)(w, filter->data));
211: }
212: break;
213:
214: default:
215: filter->status = 0;
216: break;
217: }
218:
219: return c;
220: }
221:
222: /*
223: * wchar => EUC-TW
224: */
225: int
226: mbfl_filt_conv_wchar_euctw(int c, mbfl_convert_filter *filter)
227: {
228: int c1, s, plane;
229:
230: s = 0;
231: if (c >= ucs_a1_cns11643_table_min && c < ucs_a1_cns11643_table_max) {
232: s = ucs_a1_cns11643_table[c - ucs_a1_cns11643_table_min];
233: } else if (c >= ucs_a2_cns11643_table_min && c < ucs_a2_cns11643_table_max) {
234: s = ucs_a2_cns11643_table[c - ucs_a2_cns11643_table_min];
235: } else if (c >= ucs_a3_cns11643_table_min && c < ucs_a3_cns11643_table_max) {
236: s = ucs_a3_cns11643_table[c - ucs_a3_cns11643_table_min];
237: } else if (c >= ucs_i_cns11643_table_min && c < ucs_i_cns11643_table_max) {
238: s = ucs_i_cns11643_table[c - ucs_i_cns11643_table_min];
239: } else if (c >= ucs_r_cns11643_table_min && c < ucs_r_cns11643_table_max) {
240: s = ucs_r_cns11643_table[c - ucs_r_cns11643_table_min];
241: }
242: if (s <= 0) {
243: c1 = c & ~MBFL_WCSPLANE_MASK;
244: if (c1 == MBFL_WCSPLANE_CNS11643) {
245: s = c & MBFL_WCSPLANE_MASK;
246: }
247: if (c == 0) {
248: s = 0;
249: } else if (s <= 0) {
250: s = -1;
251: }
252: }
253: if (s >= 0) {
254: plane = (s & 0x1f0000) >> 16;
255: if (plane <= 1){
256: if (s < 0x80) { /* latin */
257: CK((*filter->output_function)(s, filter->data));
258: } else {
259: s = (s & 0xffff) | 0x8080;
260: CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
261: CK((*filter->output_function)(s & 0xff, filter->data));
262: }
263: } else {
264: s = (0x8ea00000 + (plane << 16)) | ((s & 0xffff) | 0x8080);
265: CK((*filter->output_function)(0x8e , filter->data));
266: CK((*filter->output_function)((s >> 16) & 0xff, filter->data));
267: CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
268: CK((*filter->output_function)(s & 0xff, filter->data));
269: }
270: } else {
271: if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
272: CK(mbfl_filt_conv_illegal_output(c, filter));
273: }
274: }
275: return c;
276: }
277:
278: static int mbfl_filt_ident_euctw(int c, mbfl_identify_filter *filter)
279: {
280: switch (filter->status) {
281: case 0: /* latin */
282: if (c >= 0 && c < 0x80) { /* ok */
283: ;
284: } else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
285: filter->status = 1;
286: } else if (c == 0x8e) { /* DBCS lead byte */
287: filter->status = 2;
288: } else { /* bad */
289: filter->flag = 1;
290: }
291: break;
292:
293: case 1: /* got lead byte */
294: if (c < 0xa1 || c > 0xfe) { /* bad */
295: filter->flag = 1;
296: }
297: filter->status = 0;
298: break;
299:
300: case 2: /* got lead byte */
301: if (c >= 0xa1 && c < 0xaf) { /* ok */
302: filter->status = 3;
303: } else {
304: filter->flag = 1; /* bad */
305: }
306: break;
307:
308: case 3: /* got lead byte */
309: if (c < 0xa1 || c > 0xfe) { /* bad */
310: filter->flag = 1;
311: }
312: filter->status = 4;
313: break;
314:
315: case 4: /* got lead byte */
316: if (c < 0xa1 || c > 0xfe) { /* bad */
317: filter->flag = 1;
318: }
319: filter->status = 0;
320: break;
321:
322: default:
323: filter->status = 0;
324: break;
325: }
326:
327: return c;
328: }
329: