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

DEFINITIONS

1. mbfl_filt_conv_euctw_wchar
2. mbfl_filt_conv_wchar_euctw
3. mbfl_filt_ident_euctw

   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