Annotation of embedaddon/php/ext/mbstring/libmbfl/filters/mbfilter_big5.c, revision 1.1.1.2
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:
1.1.1.2 ! misho 60: static const char *mbfl_encoding_big5_aliases[] = {"CN-BIG5", "BIG-FIVE", "BIGFIVE", NULL};
1.1 misho 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,
1.1.1.2 ! misho 68: MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE
! 69: };
! 70:
! 71: const mbfl_encoding mbfl_encoding_cp950 = {
! 72: mbfl_no_encoding_cp950,
! 73: "CP950",
! 74: "BIG5",
! 75: NULL,
! 76: mblen_table_big5,
! 77: MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE
1.1 misho 78: };
79:
80: const struct mbfl_identify_vtbl vtbl_identify_big5 = {
81: mbfl_no_encoding_big5,
82: mbfl_filt_ident_common_ctor,
83: mbfl_filt_ident_common_dtor,
84: mbfl_filt_ident_big5
85: };
86:
1.1.1.2 ! misho 87: const struct mbfl_identify_vtbl vtbl_identify_cp950 = {
! 88: mbfl_no_encoding_cp950,
! 89: mbfl_filt_ident_common_ctor,
! 90: mbfl_filt_ident_common_dtor,
! 91: mbfl_filt_ident_big5
! 92: };
! 93:
1.1 misho 94: const struct mbfl_convert_vtbl vtbl_big5_wchar = {
95: mbfl_no_encoding_big5,
96: mbfl_no_encoding_wchar,
97: mbfl_filt_conv_common_ctor,
98: mbfl_filt_conv_common_dtor,
99: mbfl_filt_conv_big5_wchar,
100: mbfl_filt_conv_common_flush
101: };
102:
103: const struct mbfl_convert_vtbl vtbl_wchar_big5 = {
104: mbfl_no_encoding_wchar,
105: mbfl_no_encoding_big5,
106: mbfl_filt_conv_common_ctor,
107: mbfl_filt_conv_common_dtor,
108: mbfl_filt_conv_wchar_big5,
109: mbfl_filt_conv_common_flush
110: };
111:
1.1.1.2 ! misho 112: const struct mbfl_convert_vtbl vtbl_cp950_wchar = {
! 113: mbfl_no_encoding_cp950,
! 114: mbfl_no_encoding_wchar,
! 115: mbfl_filt_conv_common_ctor,
! 116: mbfl_filt_conv_common_dtor,
! 117: mbfl_filt_conv_big5_wchar,
! 118: mbfl_filt_conv_common_flush
! 119: };
! 120:
! 121: const struct mbfl_convert_vtbl vtbl_wchar_cp950 = {
! 122: mbfl_no_encoding_wchar,
! 123: mbfl_no_encoding_cp950,
! 124: mbfl_filt_conv_common_ctor,
! 125: mbfl_filt_conv_common_dtor,
! 126: mbfl_filt_conv_wchar_big5,
! 127: mbfl_filt_conv_common_flush
! 128: };
! 129:
1.1 misho 130: #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
131:
1.1.1.2 ! misho 132: /* 63 + 94 = 157 or 94 */
! 133: static unsigned short cp950_pua_tbl[][4] = {
! 134: {0xe000,0xe310,0xfa40,0xfefe},
! 135: {0xe311,0xeeb7,0x8e40,0xa0fe},
! 136: {0xeeb8,0xf6b0,0x8140,0x8dfe},
! 137: {0xf6b1,0xf70e,0xc6a1,0xc6fe},
! 138: {0xf70f,0xf848,0xc740,0xc8fe},
! 139: };
! 140:
1.1 misho 141: /*
142: * Big5 => wchar
143: */
144: int
145: mbfl_filt_conv_big5_wchar(int c, mbfl_convert_filter *filter)
146: {
1.1.1.2 ! misho 147: int k;
! 148: int c1, w, c2;
1.1 misho 149:
150: switch (filter->status) {
151: case 0:
1.1.1.2 ! misho 152: if (filter->from->no_encoding == mbfl_no_encoding_cp950) {
! 153: c1 = 0x80;
! 154: } else {
! 155: c1 = 0xa0;
! 156: }
! 157:
! 158: if (c >= 0 && c <= 0x80) { /* latin */
1.1 misho 159: CK((*filter->output_function)(c, filter->data));
1.1.1.2 ! misho 160: } else if (c == 0xff) {
! 161: CK((*filter->output_function)(0xf8f8, filter->data));
! 162: } else if (c > c1 && c < 0xff) { /* dbcs lead byte */
1.1 misho 163: filter->status = 1;
164: filter->cache = c;
165: } else {
166: w = c & MBFL_WCSGROUP_MASK;
167: w |= MBFL_WCSGROUP_THROUGH;
168: CK((*filter->output_function)(w, filter->data));
169: }
170: break;
171:
172: case 1: /* dbcs second byte */
173: filter->status = 0;
174: c1 = filter->cache;
175: if ((c > 0x39 && c < 0x7f) | (c > 0xa0 && c < 0xff)) {
176: if (c < 0x7f){
177: w = (c1 - 0xa1)*157 + (c - 0x40);
178: } else {
179: w = (c1 - 0xa1)*157 + (c - 0xa1) + 0x3f;
180: }
181: if (w >= 0 && w < big5_ucs_table_size) {
182: w = big5_ucs_table[w];
183: } else {
184: w = 0;
185: }
1.1.1.2 ! misho 186:
! 187: if (filter->from->no_encoding == mbfl_no_encoding_cp950) {
! 188: /* PUA for CP950 */
! 189: if (w <= 0 &&
! 190: (((c1 >= 0xfa && c1 <= 0xfe) || (c1 >= 0x8e && c1 <= 0xa0) ||
! 191: (c1 >= 0x81 && c1 <= 0x8d) ||(c1 >= 0xc7 && c1 <= 0xc8))
! 192: && ((c > 0x39 && c < 0x7f) || (c > 0xa0 && c < 0xff))) ||
! 193: ((c1 == 0xc6) && (c > 0xa0 && c < 0xff))) {
! 194: c2 = c1 << 8 | c;
! 195: for (k = 0; k < sizeof(cp950_pua_tbl)/(sizeof(unsigned short)*4); k++) {
! 196: if (c2 >= cp950_pua_tbl[k][2] && c2 <= cp950_pua_tbl[k][3]) {
! 197: break;
! 198: }
! 199: }
! 200:
! 201: if ((cp950_pua_tbl[k][2] & 0xff) == 0x40) {
! 202: w = 157*(c1 - (cp950_pua_tbl[k][2]>>8)) + c - (c >= 0xa1 ? 0x62 : 0x40)
! 203: + cp950_pua_tbl[k][0];
! 204: } else {
! 205: w = c2 - cp950_pua_tbl[k][2] + cp950_pua_tbl[k][0];
! 206: }
! 207: }
! 208: }
! 209:
1.1 misho 210: if (w <= 0) {
211: w = (c1 << 8) | c;
212: w &= MBFL_WCSPLANE_MASK;
213: w |= MBFL_WCSPLANE_BIG5;
214: }
215: CK((*filter->output_function)(w, filter->data));
216: } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
217: CK((*filter->output_function)(c, filter->data));
218: } else {
219: w = (c1 << 8) | c;
220: w &= MBFL_WCSGROUP_MASK;
221: w |= MBFL_WCSGROUP_THROUGH;
222: CK((*filter->output_function)(w, filter->data));
223: }
224: break;
225:
226: default:
227: filter->status = 0;
228: break;
229: }
230:
231: return c;
232: }
233:
234: /*
235: * wchar => Big5
236: */
237: int
238: mbfl_filt_conv_wchar_big5(int c, mbfl_convert_filter *filter)
239: {
1.1.1.2 ! misho 240: int k;
! 241: int c1, s, c2;
1.1 misho 242:
243: s = 0;
244: if (c >= ucs_a1_big5_table_min && c < ucs_a1_big5_table_max) {
245: s = ucs_a1_big5_table[c - ucs_a1_big5_table_min];
246: } else if (c >= ucs_a2_big5_table_min && c < ucs_a2_big5_table_max) {
247: s = ucs_a2_big5_table[c - ucs_a2_big5_table_min];
248: } else if (c >= ucs_a3_big5_table_min && c < ucs_a3_big5_table_max) {
249: s = ucs_a3_big5_table[c - ucs_a3_big5_table_min];
250: } else if (c >= ucs_i_big5_table_min && c < ucs_i_big5_table_max) {
251: s = ucs_i_big5_table[c - ucs_i_big5_table_min];
252: } else if (c >= ucs_pua_big5_table_min && c < ucs_pua_big5_table_max) {
253: s = ucs_pua_big5_table[c - ucs_pua_big5_table_min];
254: } else if (c >= ucs_r1_big5_table_min && c < ucs_r1_big5_table_max) {
255: s = ucs_r1_big5_table[c - ucs_r1_big5_table_min];
256: } else if (c >= ucs_r2_big5_table_min && c < ucs_r2_big5_table_max) {
257: s = ucs_r2_big5_table[c - ucs_r2_big5_table_min];
258: }
1.1.1.2 ! misho 259:
! 260: if (filter->to->no_encoding == mbfl_no_encoding_cp950) {
! 261: if (c >= 0xe000 && c <= 0xf848) { /* PUA for CP950 */
! 262: for (k = 0; k < sizeof(cp950_pua_tbl)/(sizeof(unsigned short)*4); k++) {
! 263: if (c <= cp950_pua_tbl[k][1]) {
! 264: break;
! 265: }
! 266: }
! 267: c1 = c - cp950_pua_tbl[k][0];
! 268: if ((cp950_pua_tbl[k][2] & 0xff) == 0x40) {
! 269: c2 = cp950_pua_tbl[k][2] >> 8;
! 270: s = ((c1 / 157) + c2) << 8; c1 %= 157;
! 271: s |= c1 + (c1 >= 0x3f ? 0x62 : 0x40);
! 272: } else {
! 273: s = c1 + cp950_pua_tbl[k][2];
! 274: }
! 275: }
! 276:
! 277: if (c == 0x80) {
! 278: s = 0x80;
! 279: } else if (c == 0xf8f8) {
! 280: s = 0xff;
! 281: } else if (c == 0x256d) {
! 282: s = 0xa27e;
! 283: } else if (c == 0x256e) {
! 284: s = 0xa2a1;
! 285: } else if (c == 0x256f) {
! 286: s = 0xa2a3;
! 287: } else if (c == 0x2570) {
! 288: s = 0xa2a2;
! 289: }
! 290: }
! 291:
1.1 misho 292: if (s <= 0) {
293: c1 = c & ~MBFL_WCSPLANE_MASK;
294: if (c1 == MBFL_WCSPLANE_BIG5) {
295: s = c & MBFL_WCSPLANE_MASK;
296: }
297: if (c == 0) {
298: s = 0;
299: } else if (s <= 0) {
300: s = -1;
301: }
302: }
303: if (s >= 0) {
1.1.1.2 ! misho 304: if (s <= 0x80 || s == 0xff) { /* latin */
1.1 misho 305: CK((*filter->output_function)(s, filter->data));
306: } else {
307: CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
308: CK((*filter->output_function)(s & 0xff, filter->data));
309: }
310: } else {
311: if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
312: CK(mbfl_filt_conv_illegal_output(c, filter));
313: }
314: }
315:
316: return c;
317: }
318:
319: static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter)
320: {
1.1.1.2 ! misho 321: int c1;
! 322: if (filter->encoding->no_encoding == mbfl_no_encoding_cp950) {
! 323: c1 = 0x80;
! 324: } else {
! 325: c1 = 0xa0;
! 326: }
! 327:
1.1 misho 328: if (filter->status) { /* kanji second char */
329: if (c < 0x40 || (c > 0x7e && c < 0xa1) ||c > 0xfe) { /* bad */
330: filter->flag = 1;
331: }
332: filter->status = 0;
333: } else if (c >= 0 && c < 0x80) { /* latin ok */
334: ;
1.1.1.2 ! misho 335: } else if (c > c1 && c < 0xff) { /* DBCS lead byte */
1.1 misho 336: filter->status = 1;
337: } else { /* bad */
338: filter->flag = 1;
339: }
340:
341: return c;
342: }
343:
344:
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