root/ext/mbstring/libmbfl/filters/mbfilter_utf8.c

DEFINITIONS

1. mbfl_filt_put_invalid_char
2. mbfl_filt_conv_utf8_wchar
3. mbfl_filt_conv_utf8_wchar_flush
4. mbfl_filt_conv_wchar_utf8
5. mbfl_filt_ident_utf8

   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 
  37 int mbfl_filt_ident_utf8(int c, mbfl_identify_filter *filter);
  38 
  39 const 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 
  58 static const char *mbfl_encoding_utf8_aliases[] = {"utf8", NULL};
  59 
  60 const 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 
  69 const 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 
  76 const 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 
  85 const 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 
  96 int 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  */
 110 int mbfl_filt_conv_utf8_wchar(int c, mbfl_convert_filter *filter)
 111 {
 112         int s, c1, w = 0, flag = 0;
 113 
 114 retry:
 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 
 192 int 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  */
 215 int 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 
 242 int 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 }