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:
22 *
23 */
24/*
25 * The source code included in this files was separated from mbfilter.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_utf8.h"
36
37int mbfl_filt_ident_utf8(int c, mbfl_identify_filter *filter);
38
39const unsigned char mblen_table_utf8[] = {
40    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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, 1, 1,
51    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
52    1, 1, 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    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
55    4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
56};
57
58static const char *mbfl_encoding_utf8_aliases[] = {"utf8", NULL};
59
60const mbfl_encoding mbfl_encoding_utf8 = {
61    mbfl_no_encoding_utf8,
62    "UTF-8",
63    "UTF-8",
64    (const char *(*)[])&mbfl_encoding_utf8_aliases,
65    mblen_table_utf8,
66    MBFL_ENCTYPE_MBCS
67};
68
69const struct mbfl_identify_vtbl vtbl_identify_utf8 = {
70    mbfl_no_encoding_utf8,
71    mbfl_filt_ident_common_ctor,
72    mbfl_filt_ident_common_dtor,
73    mbfl_filt_ident_utf8
74};
75
76const struct mbfl_convert_vtbl vtbl_utf8_wchar = {
77    mbfl_no_encoding_utf8,
78    mbfl_no_encoding_wchar,
79    mbfl_filt_conv_common_ctor,
80    mbfl_filt_conv_common_dtor,
81    mbfl_filt_conv_utf8_wchar,
82    mbfl_filt_conv_utf8_wchar_flush
83};
84
85const struct mbfl_convert_vtbl vtbl_wchar_utf8 = {
86    mbfl_no_encoding_wchar,
87    mbfl_no_encoding_utf8,
88    mbfl_filt_conv_common_ctor,
89    mbfl_filt_conv_common_dtor,
90    mbfl_filt_conv_wchar_utf8,
91    mbfl_filt_conv_common_flush
92};
93
94#define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
95
96int mbfl_filt_put_invalid_char(int c, mbfl_convert_filter *filter)
97{
98    int w;
99    w = c & MBFL_WCSGROUP_MASK;
100    w |= MBFL_WCSGROUP_THROUGH;
101    filter->status = 0;
102    filter->cache = 0;
103    CK((*filter->output_function)(w, filter->data));
104}
105
106
107/*
108 * UTF-8 => wchar
109 */
110int mbfl_filt_conv_utf8_wchar(int c, mbfl_convert_filter *filter)
111{
112    int s, c1, w = 0, flag = 0;
113
114retry:
115    switch (filter->status & 0xff) {
116    case 0x00:
117        if (c < 0x80) {
118            CK((*filter->output_function)(c, filter->data));
119        } else if (c >= 0xc2 && c <= 0xdf) { /* 2byte code first char: 0xc2-0xdf */
120            filter->status = 0x10;
121            filter->cache = c & 0x1f;
122        } else if (c >= 0xe0 && c <= 0xef) { /* 3byte code first char: 0xe0-0xef */
123            filter->status = 0x20;
124            filter->cache = c & 0xf;
125        } else if (c >= 0xf0 && c <= 0xf4) { /* 3byte code first char: 0xf0-0xf4 */
126            filter->status = 0x30;
127            filter->cache = c & 0x7;
128        } else {
129            mbfl_filt_put_invalid_char(c, filter);
130        }
131        break;
132    case 0x10: /* 2byte code 2nd char: 0x80-0xbf */
133    case 0x21: /* 3byte code 3rd char: 0x80-0xbf */
134    case 0x32: /* 4byte code 4th char: 0x80-0xbf */
135        filter->status = 0;
136        if (c >= 0x80 && c <= 0xbf) {
137            s = (filter->cache<<6) | (c & 0x3f);
138            filter->cache = 0;
139            CK((*filter->output_function)(s, filter->data));
140        } else {
141            mbfl_filt_put_invalid_char(filter->cache, filter);
142            goto retry;
143        }
144        break;
145    case 0x20: /* 3byte code 2nd char: 0:0xa0-0xbf,D:0x80-9F,1-C,E-F:0x80-0x9f */
146        s = (filter->cache<<6) | (c & 0x3f);
147        c1 = filter->cache & 0xf;
148
149        if ((c >= 0x80 && c <= 0xbf) &&
150            ((c1 == 0x0 && c >= 0xa0) ||
151             (c1 == 0xd && c < 0xa0) ||
152             (c1 > 0x0 && c1 != 0xd))) {
153            filter->cache = s;
154            filter->status++;
155        } else {
156            mbfl_filt_put_invalid_char(filter->cache, filter);
157            goto retry;
158        }
159        break;
160    case 0x30: /* 4byte code 2nd char: 0:0x90-0xbf,1-3:0x80-0xbf,4:0x80-0x8f */
161        s = (filter->cache<<6) | (c & 0x3f);
162        c1 = filter->cache & 0x7;
163
164        if ((c >= 0x80 && c <= 0xbf) &&
165            ((c1 == 0x0 && c >= 0x90) ||
166             (c1 == 0x4 && c < 0x90) ||
167             (c1 > 0x0 && c1 != 0x4))) {
168            filter->cache = s;
169            filter->status++;
170        } else {
171            mbfl_filt_put_invalid_char(filter->cache, filter);
172            goto retry;
173        }
174        break;
175    case 0x31: /* 4byte code 3rd char: 0x80-0xbf */
176        if (c >= 0x80 && c <= 0xbf) {
177            filter->cache = (filter->cache<<6) | (c & 0x3f);
178            filter->status++;
179        } else {
180            mbfl_filt_put_invalid_char(filter->cache, filter);
181            goto retry;
182        }
183        break;
184    default:
185        filter->status = 0;
186        break;
187    }
188
189    return c;
190}
191
192int mbfl_filt_conv_utf8_wchar_flush(mbfl_convert_filter *filter)
193{
194    int status, cache;
195
196    status = filter->status;
197    cache = filter->cache;
198
199    filter->status = 0;
200    filter->cache = 0;
201
202    if (status != 0) {
203        mbfl_filt_put_invalid_char(cache, filter);
204    }
205
206    if (filter->flush_function != NULL) {
207        (*filter->flush_function)(filter->data);
208    }
209    return 0;
210}
211
212/*
213 * wchar => UTF-8
214 */
215int mbfl_filt_conv_wchar_utf8(int c, mbfl_convert_filter *filter)
216{
217    if (c >= 0 && c < 0x110000) {
218        if (c < 0x80) {
219            CK((*filter->output_function)(c, filter->data));
220        } else if (c < 0x800) {
221            CK((*filter->output_function)(((c >> 6) & 0x1f) | 0xc0, filter->data));
222            CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
223        } else if (c < 0x10000) {
224            CK((*filter->output_function)(((c >> 12) & 0x0f) | 0xe0, filter->data));
225            CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
226            CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
227        } else {
228            CK((*filter->output_function)(((c >> 18) & 0x07) | 0xf0, filter->data));
229            CK((*filter->output_function)(((c >> 12) & 0x3f) | 0x80, filter->data));
230            CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
231            CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
232        }
233    } else {
234        if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
235            CK(mbfl_filt_conv_illegal_output(c, filter));
236        }
237    }
238
239    return c;
240}
241
242int mbfl_filt_ident_utf8(int c, mbfl_identify_filter *filter)
243{
244    int c1;
245
246    c1 = (filter->status >> 8) & 0xff;
247    filter->status &= 0xff;
248
249    if (c < 0x80) {
250        if (c < 0) {
251            filter->flag = 1;   /* bad */
252        } else if (filter->status) {
253            filter->flag = 1;   /* bad */
254        }
255        filter->status = 0;
256    } else if (c < 0xc0) {
257        switch (filter->status) {
258        case 0x20: /* 3 byte code 2nd char */
259            if ((c1 == 0x0 && c >= 0xa0) ||
260                (c1 == 0xd && c < 0xa0) ||
261                (c1 > 0x0 && c1 != 0xd)) {
262                filter->status++;
263            } else {
264                filter->flag = 1;   /* bad */
265                filter->status = 0;
266            }
267            break;
268        case 0x30: /* 4 byte code 2nd char */
269            if ((c1 == 0x0 && c >= 0x90) ||
270                (c1 > 0x0 && c1 < 0x4) ||
271                (c1 == 0x4 && c < 0x90)) {
272                filter->status++;
273            } else {
274                filter->flag = 1;   /* bad */
275                filter->status = 0;
276            }
277            break;
278        case 0x31: /* 4 byte code 3rd char */
279            filter->status++;
280            break;
281        case 0x10: /* 2 byte code 2nd char */
282        case 0x21: /* 3 byte code 3rd char */
283        case 0x32: /* 4 byte code 4th char */
284            filter->status = 0;
285            break;
286        default:
287            filter->flag = 1;   /* bad */
288            filter->status = 0;
289            break;
290        }
291    } else if (c < 0xc2) { /* 0xc0,0xc1 */
292        filter->flag = 1;   /* bad */
293        filter->status = 0;
294    } else {
295        if (filter->status) {
296            filter->flag = 1;   /* bad */
297        }
298        filter->status = 0;
299        if (c < 0xe0) {             /* 2 byte code first char */
300            filter->status = 0x10;
301        } else if (c < 0xf0) {      /* 3 byte code 1st char */
302            filter->status = 0x20;
303            filter->status |= (c & 0xf) << 8;
304        } else if (c < 0xf5) {      /* 4 byte code 1st char */
305            filter->status = 0x30;
306            filter->status |= (c & 0x7) << 8;
307        } else {
308            filter->flag = 1;   /* bad */
309        }
310    }
311
312    return c;
313}
314