ext/mbstring/libmbfl/filters/mbfilter

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This source file includes following definitions.
mbfl_filt_conv_utf7imap_wchar
mbfl_filt_conv_wchar_utf7imap
mbfl_filt_conv_wchar_utf7imap_flush
   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_utf7imap.h"
  36 
  37 const mbfl_encoding mbfl_encoding_utf7imap = {
  38         mbfl_no_encoding_utf7imap,
  39         "UTF7-IMAP",
  40         NULL,
  41         NULL,
  42         NULL,
  43         MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
  44 };
  45 
  46 const struct mbfl_convert_vtbl vtbl_utf7imap_wchar = {
  47         mbfl_no_encoding_utf7imap,
  48         mbfl_no_encoding_wchar,
  49         mbfl_filt_conv_common_ctor,
  50         mbfl_filt_conv_common_dtor,
  51         mbfl_filt_conv_utf7imap_wchar,
  52         mbfl_filt_conv_common_flush };
  53 
  54 const struct mbfl_convert_vtbl vtbl_wchar_utf7imap = {
  55         mbfl_no_encoding_wchar,
  56         mbfl_no_encoding_utf7imap,
  57         mbfl_filt_conv_common_ctor,
  58         mbfl_filt_conv_common_dtor,
  59         mbfl_filt_conv_wchar_utf7imap,
  60         mbfl_filt_conv_wchar_utf7imap_flush };
  61 
  62 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  63 
  64 /*
  65  * UTF7-IMAP => wchar
  66  */
  67 int mbfl_filt_conv_utf7imap_wchar(int c, mbfl_convert_filter *filter)
  68 {
  69         int s, n;
  70 
  71         n = -1;
  72         if (filter->status != 0) {              /* Modified Base64 */
  73                 if (c >= 0x41 && c <= 0x5a) {           /* A - Z */
  74                         n = c - 65;
  75                 } else if (c >= 0x61 && c <= 0x7a) {    /* a - z */
  76                         n = c - 71;
  77                 } else if (c >= 0x30 && c <= 0x39) {    /* 0 - 9 */
  78                         n = c + 4;
  79                 } else if (c == 0x2b) {                 /* '+' */
  80                         n = 62;
  81                 } else if (c == 0x2c) {                 /* ',' */
  82                         n = 63;
  83                 }
  84                 if (n < 0 || n > 63) {
  85                         if (c == 0x2d) {
  86                                 if (filter->status == 1) {              /* "&-" -> "&" */
  87                                         CK((*filter->output_function)(0x26, filter->data));
  88                                 }
  89                         } else if (c >= 0 && c < 0x80) {        /* ASCII exclude '-' */
  90                                 CK((*filter->output_function)(c, filter->data));
  91                         } else {                /* illegal character */
  92                                 s = c & MBFL_WCSGROUP_MASK;
  93                                 s |= MBFL_WCSGROUP_THROUGH;
  94                                 CK((*filter->output_function)(s, filter->data));
  95                         }
  96                         filter->cache = 0;
  97                         filter->status = 0;
  98                         return c;
  99                 }
 100         }
 101 
 102         switch (filter->status) {
 103         /* directly encoded characters */
 104         case 0:
 105                 if (c == 0x26) {        /* '&'  shift character */
 106                         filter->status++;
 107                 } else if (c >= 0 && c < 0x80) {        /* ASCII */
 108                         CK((*filter->output_function)(c, filter->data));
 109                 } else {                /* illegal character */
 110                         s = c & MBFL_WCSGROUP_MASK;
 111                         s |= MBFL_WCSGROUP_THROUGH;
 112                         CK((*filter->output_function)(s, filter->data));
 113                 }
 114                 break;
 115 
 116         /* decode Modified Base64 */
 117         case 1:
 118         case 2:
 119                 filter->cache |= n << 10;
 120                 filter->status = 3;
 121                 break;
 122         case 3:
 123                 filter->cache |= n << 4;
 124                 filter->status = 4;
 125                 break;
 126         case 4:
 127                 s = ((n >> 2) & 0xf) | (filter->cache & 0xffff);
 128                 n = (n & 0x3) << 14;
 129                 filter->status = 5;
 130                 if (s >= 0xd800 && s < 0xdc00) {
 131                         s = (((s & 0x3ff) << 16) + 0x400000) | n;
 132                         filter->cache = s;
 133                 } else if (s >= 0xdc00 && s < 0xe000) {
 134                         s &= 0x3ff;
 135                         s |= (filter->cache & 0xfff0000) >> 6;
 136                         filter->cache = n;
 137                         if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
 138                                 CK((*filter->output_function)(s, filter->data));
 139                         } else {                /* illegal character */
 140                                 s &= MBFL_WCSGROUP_MASK;
 141                                 s |= MBFL_WCSGROUP_THROUGH;
 142                                 CK((*filter->output_function)(s, filter->data));
 143                         }
 144                 } else {
 145                         filter->cache = n;
 146                         CK((*filter->output_function)(s, filter->data));
 147                 }
 148                 break;
 149 
 150         case 5:
 151                 filter->cache |= n << 8;
 152                 filter->status = 6;
 153                 break;
 154         case 6:
 155                 filter->cache |= n << 2;
 156                 filter->status = 7;
 157                 break;
 158         case 7:
 159                 s = ((n >> 4) & 0x3) | (filter->cache & 0xffff);
 160                 n = (n & 0xf) << 12;
 161                 filter->status = 8;
 162                 if (s >= 0xd800 && s < 0xdc00) {
 163                         s = (((s & 0x3ff) << 16) + 0x400000) | n;
 164                         filter->cache = s;
 165                 } else if (s >= 0xdc00 && s < 0xe000) {
 166                         s &= 0x3ff;
 167                         s |= (filter->cache & 0xfff0000) >> 6;
 168                         filter->cache = n;
 169                         if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
 170                                 CK((*filter->output_function)(s, filter->data));
 171                         } else {                /* illegal character */
 172                                 s &= MBFL_WCSGROUP_MASK;
 173                                 s |= MBFL_WCSGROUP_THROUGH;
 174                                 CK((*filter->output_function)(s, filter->data));
 175                         }
 176                 } else {
 177                         filter->cache = n;
 178                         CK((*filter->output_function)(s, filter->data));
 179                 }
 180                 break;
 181 
 182         case 8:
 183                 filter->cache |= n << 6;
 184                 filter->status = 9;
 185                 break;
 186         case 9:
 187                 s = n | (filter->cache & 0xffff);
 188                 filter->status = 2;
 189                 if (s >= 0xd800 && s < 0xdc00) {
 190                         s = (((s & 0x3ff) << 16) + 0x400000);
 191                         filter->cache = s;
 192                 } else if (s >= 0xdc00 && s < 0xe000) {
 193                         s &= 0x3ff;
 194                         s |= (filter->cache & 0xfff0000) >> 6;
 195                         filter->cache = 0;
 196                         if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
 197                                 CK((*filter->output_function)(s, filter->data));
 198                         } else {                /* illegal character */
 199                                 s &= MBFL_WCSGROUP_MASK;
 200                                 s |= MBFL_WCSGROUP_THROUGH;
 201                                 CK((*filter->output_function)(s, filter->data));
 202                         }
 203                 } else {
 204                         filter->cache = 0;
 205                         CK((*filter->output_function)(s, filter->data));
 206                 }
 207                 break;
 208 
 209         default:
 210                 filter->status = 0;
 211                 break;
 212         }
 213 
 214         return c;
 215 }
 216 
 217 static const unsigned char mbfl_utf7imap_base64_table[] =
 218 {
 219  /* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
 220    0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
 221  /* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
 222    0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
 223  /* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
 224    0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
 225  /* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
 226    0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
 227  /* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', ',', '\0' */
 228    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2c,0x00
 229 };
 230 
 231 /*
 232  * wchar => UTF7-IMAP
 233  */
 234 int mbfl_filt_conv_wchar_utf7imap(int c, mbfl_convert_filter *filter)
 235 {
 236         int n, s;
 237 
 238         n = 0;
 239         if (c == 0x26) {
 240                 n = 1;
 241         } else if ((c >= 0x20 && c <= 0x7e) || c == 0) {
 242                 n = 2;
 243         } else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
 244                 ;
 245         } else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
 246                 s = ((c >> 10) - 0x40) | 0xd800;
 247                 CK((*filter->filter_function)(s, filter));
 248                 s = (c & 0x3ff) | 0xdc00;
 249                 CK((*filter->filter_function)(s, filter));
 250                 return c;
 251         } else {
 252                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 253                         CK(mbfl_filt_conv_illegal_output(c, filter));
 254                 }
 255                 return c;
 256         }
 257 
 258         switch (filter->status) {
 259         case 0:
 260                 if (n != 0) {   /* directly encode characters */
 261                         CK((*filter->output_function)(c, filter->data));
 262                         if (n == 1) {
 263                                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 264                         }
 265                 } else {        /* Modified Base64 */
 266                         CK((*filter->output_function)(0x26, filter->data));             /* '&' */
 267                         filter->status = 1;
 268                         filter->cache = c;
 269                 }
 270                 break;
 271 
 272         /* encode Modified Base64 */
 273         case 1:
 274                 s = filter->cache;
 275                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 10) & 0x3f], filter->data));
 276                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 4) & 0x3f], filter->data));
 277                 if (n != 0) {
 278                         CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 2) & 0x3c], filter->data));
 279                         CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 280                         CK((*filter->output_function)(c, filter->data));
 281                         if (n == 1) {
 282                                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 283                         }
 284                         filter->status = 0;
 285                 } else {
 286                         filter->status = 2;
 287                         filter->cache = ((s & 0xf) << 16) | c;
 288                 }
 289                 break;
 290 
 291         case 2:
 292                 s = filter->cache;
 293                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 14) & 0x3f], filter->data));
 294                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 8) & 0x3f], filter->data));
 295                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 2) & 0x3f], filter->data));
 296                 if (n != 0) {
 297                         CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 4) & 0x30], filter->data));
 298                         CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 299                         CK((*filter->output_function)(c, filter->data));
 300                         if (n == 1) {
 301                                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 302                         }
 303                         filter->status = 0;
 304                 } else {
 305                         filter->status = 3;
 306                         filter->cache = ((s & 0x3) << 16) | c;
 307                 }
 308                 break;
 309 
 310         case 3:
 311                 s = filter->cache;
 312                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 12) & 0x3f], filter->data));
 313                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 6) & 0x3f], filter->data));
 314                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[s & 0x3f], filter->data));
 315                 if (n != 0) {
 316                         CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 317                         CK((*filter->output_function)(c, filter->data));
 318                         if (n == 1) {
 319                                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 320                         }
 321                         filter->status = 0;
 322                 } else {
 323                         filter->status = 1;
 324                         filter->cache = c;
 325                 }
 326                 break;
 327 
 328         default:
 329                 filter->status = 0;
 330                 break;
 331         }
 332 
 333         return c;
 334 
 335 }
 336 
 337 int mbfl_filt_conv_wchar_utf7imap_flush(mbfl_convert_filter *filter)
 338 {
 339         int status, cache;
 340 
 341         status = filter->status;
 342         cache = filter->cache;
 343         filter->status = 0;
 344         filter->cache = 0;
 345         /* flush fragments */
 346         switch (status) {
 347         case 1:
 348                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 10) & 0x3f], filter->data));
 349                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 4) & 0x3f], filter->data));
 350                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 2) & 0x3c], filter->data));
 351                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 352                 break;
 353 
 354         case 2:
 355                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 14) & 0x3f], filter->data));
 356                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 8) & 0x3f], filter->data));
 357                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 2) & 0x3f], filter->data));
 358                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 4) & 0x30], filter->data));
 359                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 360                 break;
 361 
 362         case 3:
 363                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 12) & 0x3f], filter->data));
 364                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 6) & 0x3f], filter->data));
 365                 CK((*filter->output_function)(mbfl_utf7imap_base64_table[cache & 0x3f], filter->data));
 366                 CK((*filter->output_function)(0x2d, filter->data));             /* '-' */
 367                 break;
 368         }
 369         return 0;
 370 }
 371 
 372
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root/ext/mbstring/libmbfl/filters/mbfilter_utf7imap.c

DEFINITIONS
