src/codeconv.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2005 Hiroyuki Yamamoto
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include "defs.h"
  25
  26 #include <glib.h>
  27 #include <glib/gi18n.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32
  33 #if HAVE_LOCALE_H
  34 #  include <locale.h>
  35 #endif
  36
  37 #include <iconv.h>
  38
  39 #include "codeconv.h"
  40 #include "unmime.h"
  41 #include "base64.h"
  42 #include "quoted-printable.h"
  43 #include "utils.h"
  44 #include "prefs_common.h"
  45
  46 typedef enum
  47 {
  48         JIS_ASCII,
  49         JIS_KANJI,
  50         JIS_HWKANA,
  51         JIS_AUXKANJI
  52 } JISState;
  53
  54 #define SUBST_CHAR      0x5f;
  55 #define ESC             '\033'
  56
  57 #define iseuckanji(c) \
  58         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xfe)
  59 #define iseuchwkana1(c) \
  60         (((c) & 0xff) == 0x8e)
  61 #define iseuchwkana2(c) \
  62         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xdf)
  63 #define iseucaux(c) \
  64         (((c) & 0xff) == 0x8f)
  65 #define issjiskanji1(c) \
  66         ((((c) & 0xff) >= 0x81 && ((c) & 0xff) <= 0x9f) || \
  67          (((c) & 0xff) >= 0xe0 && ((c) & 0xff) <= 0xfc))
  68 #define issjiskanji2(c) \
  69         ((((c) & 0xff) >= 0x40 && ((c) & 0xff) <= 0x7e) || \
  70          (((c) & 0xff) >= 0x80 && ((c) & 0xff) <= 0xfc))
  71 #define issjishwkana(c) \
  72         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xdf)
  73
  74 #define K_IN()                          \
  75         if (state != JIS_KANJI) {       \
  76                 *out++ = ESC;           \
  77                 *out++ = '$';           \
  78                 *out++ = 'B';           \
  79                 state = JIS_KANJI;      \
  80         }
  81
  82 #define K_OUT()                         \
  83         if (state != JIS_ASCII) {       \
  84                 *out++ = ESC;           \
  85                 *out++ = '(';           \
  86                 *out++ = 'B';           \
  87                 state = JIS_ASCII;      \
  88         }
  89
  90 #define HW_IN()                         \
  91         if (state != JIS_HWKANA) {      \
  92                 *out++ = ESC;           \
  93                 *out++ = '(';           \
  94                 *out++ = 'I';           \
  95                 state = JIS_HWKANA;     \
  96         }
  97
  98 #define AUX_IN()                        \
  99         if (state != JIS_AUXKANJI) {    \
 100                 *out++ = ESC;           \
 101                 *out++ = '$';           \
 102                 *out++ = '(';           \
 103                 *out++ = 'D';           \
 104                 state = JIS_AUXKANJI;   \
 105         }
 106
 107 static void conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 108 static void conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf);
 109 static void conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 110
 111 static void conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 112 static void conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 113 static void conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 114 static void conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 115
 116 static void conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 117 static void conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf);
 118
 119 static void conv_unreadable_8bit(gchar *str);
 120
 121 static void conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 122 static void conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 123 static void conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 124
 125 static void conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 126 static void conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 127 static void conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf);
 128
 129 static gboolean strict_mode = FALSE;
 130
 131 void codeconv_set_strict(gboolean mode)
 132 {
 133         strict_mode = mode;
 134 }
 135
 136 static void conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 137 {
 138         const guchar *in = inbuf;
 139         guchar *out = outbuf;
 140         JISState state = JIS_ASCII;
 141
 142         while (*in != '\0') {
 143                 if (*in == ESC) {
 144                         in++;
 145                         if (*in == '$') {
 146                                 if (*(in + 1) == '@' || *(in + 1) == 'B') {
 147                                         state = JIS_KANJI;
 148                                         in += 2;
 149                                 } else if (*(in + 1) == '(' &&
 150                                            *(in + 2) == 'D') {
 151                                         state = JIS_AUXKANJI;
 152                                         in += 3;
 153                                 } else {
 154                                         /* unknown escape sequence */
 155                                         state = JIS_ASCII;
 156                                 }
 157                         } else if (*in == '(') {
 158                                 if (*(in + 1) == 'B' || *(in + 1) == 'J') {
 159                                         state = JIS_ASCII;
 160                                         in += 2;
 161                                 } else if (*(in + 1) == 'I') {
 162                                         state = JIS_HWKANA;
 163                                         in += 2;
 164                                 } else {
 165                                         /* unknown escape sequence */
 166                                         state = JIS_ASCII;
 167                                 }
 168                         } else {
 169                                 /* unknown escape sequence */
 170                                 state = JIS_ASCII;
 171                         }
 172                 } else if (*in == 0x0e) {
 173                         state = JIS_HWKANA;
 174                         in++;
 175                 } else if (*in == 0x0f) {
 176                         state = JIS_ASCII;
 177                         in++;
 178                 } else {
 179                         switch (state) {
 180                         case JIS_ASCII:
 181                                 *out++ = *in++;
 182                                 break;
 183                         case JIS_KANJI:
 184                                 *out++ = *in++ | 0x80;
 185                                 if (*in == '\0') break;
 186                                 *out++ = *in++ | 0x80;
 187                                 break;
 188                         case JIS_HWKANA:
 189                                 *out++ = 0x8e;
 190                                 *out++ = *in++ | 0x80;
 191                                 break;
 192                         case JIS_AUXKANJI:
 193                                 *out++ = 0x8f;
 194                                 *out++ = *in++ | 0x80;
 195                                 if (*in == '\0') break;
 196                                 *out++ = *in++ | 0x80;
 197                                 break;
 198                         }
 199                 }
 200         }
 201
 202         *out = '\0';
 203 }
 204
 205 #define JIS_HWDAKUTEN           0x5e
 206 #define JIS_HWHANDAKUTEN        0x5f
 207
 208 static gint conv_jis_hantozen(guchar *outbuf, guchar jis_code, guchar sound_sym)
 209 {
 210         static guint16 h2z_tbl[] = {
 211                 /* 0x20 - 0x2f */
 212                 0x0000, 0x2123, 0x2156, 0x2157, 0x2122, 0x2126, 0x2572, 0x2521,
 213                 0x2523, 0x2525, 0x2527, 0x2529, 0x2563, 0x2565, 0x2567, 0x2543,
 214                 /* 0x30 - 0x3f */
 215                 0x213c, 0x2522, 0x2524, 0x2526, 0x2528, 0x252a, 0x252b, 0x252d,
 216                 0x252f, 0x2531, 0x2533, 0x2535, 0x2537, 0x2539, 0x253b, 0x253d,
 217                 /* 0x40 - 0x4f */
 218                 0x253f, 0x2541, 0x2544, 0x2546, 0x2548, 0x254a, 0x254b, 0x254c,
 219                 0x254d, 0x254e, 0x254f, 0x2552, 0x2555, 0x2558, 0x255b, 0x255e,
 220                 /* 0x50 - 0x5f */
 221                 0x255f, 0x2560, 0x2561, 0x2562, 0x2564, 0x2566, 0x2568, 0x2569,
 222                 0x256a, 0x256b, 0x256c, 0x256d, 0x256f, 0x2573, 0x212b, 0x212c
 223         };
 224
 225         static guint16 dakuten_tbl[] = {
 226                 /* 0x30 - 0x3f */
 227                 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x252c, 0x252e,
 228                 0x2530, 0x2532, 0x2534, 0x2536, 0x2538, 0x253a, 0x253c, 0x253e,
 229                 /* 0x40 - 0x4f */
 230                 0x2540, 0x2542, 0x2545, 0x2547, 0x2549, 0x0000, 0x0000, 0x0000,
 231                 0x0000, 0x0000, 0x2550, 0x2553, 0x2556, 0x2559, 0x255c, 0x0000
 232         };
 233
 234         static guint16 handakuten_tbl[] = {
 235                 /* 0x4a - 0x4e */
 236                 0x2551, 0x2554, 0x2557, 0x255a, 0x255d
 237         };
 238
 239         guint16 out_code;
 240
 241         jis_code &= 0x7f;
 242         sound_sym &= 0x7f;
 243
 244         if (jis_code < 0x21 || jis_code > 0x5f)
 245                 return 0;
 246
 247         if (sound_sym == JIS_HWDAKUTEN &&
 248             jis_code >= 0x36 && jis_code <= 0x4e) {
 249                 out_code = dakuten_tbl[jis_code - 0x30];
 250                 if (out_code != 0) {
 251                         *outbuf = out_code >> 8;
 252                         *(outbuf + 1) = out_code & 0xff;
 253                         return 2;
 254                 }
 255         }
 256
 257         if (sound_sym == JIS_HWHANDAKUTEN &&
 258             jis_code >= 0x4a && jis_code <= 0x4e) {
 259                 out_code = handakuten_tbl[jis_code - 0x4a];
 260                 *outbuf = out_code >> 8;
 261                 *(outbuf + 1) = out_code & 0xff;
 262                 return 2;
 263         }
 264
 265         out_code = h2z_tbl[jis_code - 0x20];
 266         *outbuf = out_code >> 8;
 267         *(outbuf + 1) = out_code & 0xff;
 268         return 1;
 269 }
 270
 271 static void conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf)
 272 {
 273         const guchar *in = inbuf;
 274         guchar *out = outbuf;
 275         JISState state = JIS_ASCII;
 276
 277         while (*in != '\0') {
 278                 if (IS_ASCII(*in)) {
 279                         K_OUT();
 280                         *out++ = *in++;
 281                 } else if (iseuckanji(*in)) {
 282                         if (iseuckanji(*(in + 1))) {
 283                                 K_IN();
 284                                 *out++ = *in++ & 0x7f;
 285                                 *out++ = *in++ & 0x7f;
 286                         } else {
 287                                 K_OUT();
 288                                 *out++ = SUBST_CHAR;
 289                                 in++;
 290                                 if (*in != '\0' && !IS_ASCII(*in)) {
 291                                         *out++ = SUBST_CHAR;
 292                                         in++;
 293                                 }
 294                         }
 295                 } else if (iseuchwkana1(*in)) {
 296                         if (iseuchwkana2(*(in + 1))) {
 297                                 if (prefs_common.allow_jisx0201_kana) {
 298                                         HW_IN();
 299                                         in++;
 300                                         *out++ = *in++ & 0x7f;
 301                                 } else {
 302                                         guchar jis_ch[2];
 303                                         gint len;
 304
 305                                         if (iseuchwkana1(*(in + 2)) &&
 306                                             iseuchwkana2(*(in + 3)))
 307                                                 len = conv_jis_hantozen
 308                                                         (jis_ch,
 309                                                          *(in + 1), *(in + 3));
 310                                         else
 311                                                 len = conv_jis_hantozen
 312                                                         (jis_ch,
 313                                                          *(in + 1), '\0');
 314                                         if (len == 0)
 315                                                 in += 2;
 316                                         else {
 317                                                 K_IN();
 318                                                 in += len * 2;
 319                                                 *out++ = jis_ch[0];
 320                                                 *out++ = jis_ch[1];
 321                                         }
 322                                 }
 323                         } else {
 324                                 K_OUT();
 325                                 in++;
 326                                 if (*in != '\0' && !IS_ASCII(*in)) {
 327                                         *out++ = SUBST_CHAR;
 328                                         in++;
 329                                 }
 330                         }
 331                 } else if (iseucaux(*in)) {
 332                         in++;
 333                         if (iseuckanji(*in) && iseuckanji(*(in + 1))) {
 334                                 AUX_IN();
 335                                 *out++ = *in++ & 0x7f;
 336                                 *out++ = *in++ & 0x7f;
 337                         } else {
 338                                 K_OUT();
 339                                 if (*in != '\0' && !IS_ASCII(*in)) {
 340                                         *out++ = SUBST_CHAR;
 341                                         in++;
 342                                         if (*in != '\0' && !IS_ASCII(*in)) {
 343                                                 *out++ = SUBST_CHAR;
 344                                                 in++;
 345                                         }
 346                                 }
 347                         }
 348                 } else {
 349                         K_OUT();
 350                         *out++ = SUBST_CHAR;
 351                         in++;
 352                 }
 353         }
 354
 355         K_OUT();
 356         *out = '\0';
 357 }
 358
 359 static void conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 360 {
 361         const guchar *in = inbuf;
 362         guchar *out = outbuf;
 363
 364         while (*in != '\0') {
 365                 if (IS_ASCII(*in)) {
 366                         *out++ = *in++;
 367                 } else if (issjiskanji1(*in)) {
 368                         if (issjiskanji2(*(in + 1))) {
 369                                 guchar out1 = *in;
 370                                 guchar out2 = *(in + 1);
 371                                 guchar row;
 372
 373                                 row = out1 < 0xa0 ? 0x70 : 0xb0;
 374                                 if (out2 < 0x9f) {
 375                                         out1 = (out1 - row) * 2 - 1;
 376                                         out2 -= out2 > 0x7f ? 0x20 : 0x1f;
 377                                 } else {
 378                                         out1 = (out1 - row) * 2;
 379                                         out2 -= 0x7e;
 380                                 }
 381
 382                                 *out++ = out1 | 0x80;
 383                                 *out++ = out2 | 0x80;
 384                                 in += 2;
 385                         } else {
 386                                 *out++ = SUBST_CHAR;
 387                                 in++;
 388                                 if (*in != '\0' && !IS_ASCII(*in)) {
 389                                         *out++ = SUBST_CHAR;
 390                                         in++;
 391                                 }
 392                         }
 393                 } else if (issjishwkana(*in)) {
 394                         *out++ = 0x8e;
 395                         *out++ = *in++;
 396                 } else {
 397                         *out++ = SUBST_CHAR;
 398                         in++;
 399                 }
 400         }
 401
 402         *out = '\0';
 403 }
 404
 405 static void conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 406 {
 407         gchar *eucstr;
 408
 409         Xalloca(eucstr, outlen, return);
 410
 411         conv_jistoeuc(eucstr, outlen, inbuf);
 412         conv_euctoutf8(outbuf, outlen, eucstr);
 413 }
 414
 415 static void conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 416 {
 417         gchar *tmpstr;
 418
 419         tmpstr = conv_iconv_strdup(inbuf, CS_SHIFT_JIS, CS_UTF_8);
 420         if (tmpstr) {
 421                 strncpy2(outbuf, tmpstr, outlen);
 422                 g_free(tmpstr);
 423         } else
 424                 strncpy2(outbuf, inbuf, outlen);
 425 }
 426
 427 static void conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 428 {
 429         static iconv_t cd = (iconv_t)-1;
 430         static gboolean iconv_ok = TRUE;
 431         gchar *tmpstr;
 432
 433         if (cd == (iconv_t)-1) {
 434                 if (!iconv_ok) {
 435                         strncpy2(outbuf, inbuf, outlen);
 436                         return;
 437                 }
 438                 cd = iconv_open(CS_UTF_8, CS_EUC_JP_MS);
 439                 if (cd == (iconv_t)-1) {
 440                         cd = iconv_open(CS_UTF_8, CS_EUC_JP);
 441                         if (cd == (iconv_t)-1) {
 442                                 g_warning("conv_euctoutf8(): %s\n",
 443                                           g_strerror(errno));
 444                                 iconv_ok = FALSE;
 445                                 strncpy2(outbuf, inbuf, outlen);
 446                                 return;
 447                         }
 448                 }
 449         }
 450
 451         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
 452         if (tmpstr) {
 453                 strncpy2(outbuf, tmpstr, outlen);
 454                 g_free(tmpstr);
 455         } else
 456                 strncpy2(outbuf, inbuf, outlen);
 457 }
 458
 459 static void conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 460 {
 461         switch (conv_guess_ja_encoding(inbuf)) {
 462         case C_ISO_2022_JP:
 463                 conv_jistoutf8(outbuf, outlen, inbuf);
 464                 break;
 465         case C_SHIFT_JIS:
 466                 conv_sjistoutf8(outbuf, outlen, inbuf);
 467                 break;
 468         case C_EUC_JP:
 469                 conv_euctoutf8(outbuf, outlen, inbuf);
 470                 break;
 471         default:
 472                 strncpy2(outbuf, inbuf, outlen);
 473                 break;
 474         }
 475 }
 476
 477 static void conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 478 {
 479         static iconv_t cd = (iconv_t)-1;
 480         static gboolean iconv_ok = TRUE;
 481         gchar *tmpstr;
 482
 483         if (cd == (iconv_t)-1) {
 484                 if (!iconv_ok) {
 485                         strncpy2(outbuf, inbuf, outlen);
 486                         return;
 487                 }
 488                 cd = iconv_open(CS_EUC_JP_MS, CS_UTF_8);
 489                 if (cd == (iconv_t)-1) {
 490                         cd = iconv_open(CS_EUC_JP, CS_UTF_8);
 491                         if (cd == (iconv_t)-1) {
 492                                 g_warning("conv_utf8toeuc(): %s\n",
 493                                           g_strerror(errno));
 494                                 iconv_ok = FALSE;
 495                                 strncpy2(outbuf, inbuf, outlen);
 496                                 return;
 497                         }
 498                 }
 499         }
 500
 501         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
 502         if (tmpstr) {
 503                 strncpy2(outbuf, tmpstr, outlen);
 504                 g_free(tmpstr);
 505         } else
 506                 strncpy2(outbuf, inbuf, outlen);
 507 }
 508
 509 static void conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf)
 510 {
 511         gchar *eucstr;
 512
 513         Xalloca(eucstr, outlen, return);
 514
 515         conv_utf8toeuc(eucstr, outlen, inbuf);
 516         conv_euctojis(outbuf, outlen, eucstr);
 517 }
 518
 519 static void conv_unreadable_8bit(gchar *str)
 520 {
 521         register guchar *p = str;
 522
 523         while (*p != '\0') {
 524                 /* convert CR+LF -> LF */
 525                 if (*p == '\r' && *(p + 1) == '\n')
 526                         memmove(p, p + 1, strlen(p));
 527                 else if (!IS_ASCII(*p)) *p = SUBST_CHAR;
 528                 p++;
 529         }
 530 }
 531
 532 #define NCV     '\0'
 533
 534 void conv_mb_alnum(gchar *str)
 535 {
 536         static guchar char_tbl[] = {
 537                 /* 0xa0 - 0xaf */
 538                 NCV, ' ', NCV, NCV, ',', '.', NCV, ':',
 539                 ';', '?', '!', NCV, NCV, NCV, NCV, NCV,
 540                 /* 0xb0 - 0xbf */
 541                 NCV, NCV, NCV, NCV, NCV, NCV, NCV, NCV,
 542                 NCV, NCV, NCV, NCV, NCV, NCV, NCV, NCV,
 543                 /* 0xc0 - 0xcf */
 544                 NCV, NCV, NCV, NCV, NCV, NCV, NCV, NCV,
 545                 NCV, NCV, '(', ')', NCV, NCV, '[', ']',
 546                 /* 0xd0 - 0xdf */
 547                 '{', '}', NCV, NCV, NCV, NCV, NCV, NCV,
 548                 NCV, NCV, NCV, NCV, '+', '-', NCV, NCV,
 549                 /* 0xe0 - 0xef */
 550                 NCV, '=', NCV, '<', '>', NCV, NCV, NCV,
 551                 NCV, NCV, NCV, NCV, NCV, NCV, NCV, NCV
 552         };
 553
 554         register guchar *p = str;
 555         register gint len;
 556
 557         len = strlen(str);
 558
 559         while (len > 1) {
 560                 if (*p == 0xa3) {
 561                         register guchar ch = *(p + 1);
 562
 563                         if (ch >= 0xb0 && ch <= 0xfa) {
 564                                 /* [a-zA-Z] */
 565                                 *p = ch & 0x7f;
 566                                 p++;
 567                                 len--;
 568                                 memmove(p, p + 1, len);
 569                                 len--;
 570                         } else  {
 571                                 p += 2;
 572                                 len -= 2;
 573                         }
 574                 } else if (*p == 0xa1) {
 575                         register guchar ch = *(p + 1);
 576
 577                         if (ch >= 0xa0 && ch <= 0xef &&
 578                             NCV != char_tbl[ch - 0xa0]) {
 579                                 *p = char_tbl[ch - 0xa0];
 580                                 p++;
 581                                 len--;
 582                                 memmove(p, p + 1, len);
 583                                 len--;
 584                         } else {
 585                                 p += 2;
 586                                 len -= 2;
 587                         }
 588                 } else if (iseuckanji(*p)) {
 589                         p += 2;
 590                         len -= 2;
 591                 } else {
 592                         p++;
 593                         len--;
 594                 }
 595         }
 596 }
 597
 598 CharSet conv_guess_ja_encoding(const gchar *str)
 599 {
 600         const guchar *p = str;
 601         CharSet guessed = C_US_ASCII;
 602
 603         while (*p != '\0') {
 604                 if (*p == ESC && (*(p + 1) == '$' || *(p + 1) == '(')) {
 605                         if (guessed == C_US_ASCII)
 606                                 return C_ISO_2022_JP;
 607                         p += 2;
 608                 } else if (IS_ASCII(*p)) {
 609                         p++;
 610                 } else if (iseuckanji(*p) && iseuckanji(*(p + 1))) {
 611                         if (*p >= 0xfd && *p <= 0xfe)
 612                                 return C_EUC_JP;
 613                         else if (guessed == C_SHIFT_JIS) {
 614                                 if ((issjiskanji1(*p) &&
 615                                      issjiskanji2(*(p + 1))) ||
 616                                     issjishwkana(*p))
 617                                         guessed = C_SHIFT_JIS;
 618                                 else
 619                                         guessed = C_EUC_JP;
 620                         } else
 621                                 guessed = C_EUC_JP;
 622                         p += 2;
 623                 } else if (issjiskanji1(*p) && issjiskanji2(*(p + 1))) {
 624                         if (iseuchwkana1(*p) && iseuchwkana2(*(p + 1)))
 625                                 guessed = C_SHIFT_JIS;
 626                         else
 627                                 return C_SHIFT_JIS;
 628                         p += 2;
 629                 } else if (issjishwkana(*p)) {
 630                         guessed = C_SHIFT_JIS;
 631                         p++;
 632                 } else {
 633                         p++;
 634                 }
 635         }
 636
 637         return guessed;
 638 }
 639
 640 static void conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 641 {
 642         conv_jistoutf8(outbuf, outlen, inbuf);
 643 }
 644
 645 static void conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 646 {
 647         conv_sjistoutf8(outbuf, outlen, inbuf);
 648 }
 649
 650 static void conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 651 {
 652         conv_euctoutf8(outbuf, outlen, inbuf);
 653 }
 654
 655 void conv_utf8todisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 656 {
 657         if (g_utf8_validate(inbuf, -1, NULL) == TRUE)
 658                 strncpy2(outbuf, inbuf, outlen);
 659         else
 660                 conv_ustodisp(outbuf, outlen, inbuf);
 661 }
 662
 663 static void conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 664 {
 665         conv_anytoutf8(outbuf, outlen, inbuf);
 666         if (g_utf8_validate(outbuf, -1, NULL) != TRUE)
 667                 conv_unreadable_8bit(outbuf);
 668 }
 669
 670 static void conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 671 {
 672         strncpy2(outbuf, inbuf, outlen);
 673         conv_unreadable_8bit(outbuf);
 674 }
 675
 676 void conv_localetodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 677 {
 678         gchar *tmpstr;
 679
 680         codeconv_set_strict(TRUE);
 681         tmpstr = conv_iconv_strdup(inbuf, conv_get_locale_charset_str(),
 682                                    CS_INTERNAL);
 683         codeconv_set_strict(FALSE);
 684         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
 685                 strncpy2(outbuf, tmpstr, outlen);
 686                 g_free(tmpstr);
 687                 return;
 688         } else if (tmpstr && !g_utf8_validate(tmpstr, -1, NULL)) {
 689                 g_free(tmpstr);
 690                 codeconv_set_strict(TRUE);
 691                 tmpstr = conv_iconv_strdup(inbuf,
 692                                 conv_get_locale_charset_str_no_utf8(),
 693                                 CS_INTERNAL);
 694                 codeconv_set_strict(FALSE);
 695         }
 696         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
 697                 strncpy2(outbuf, tmpstr, outlen);
 698                 g_free(tmpstr);
 699         } else
 700                 conv_utf8todisp(outbuf, outlen, inbuf);
 701 }
 702
 703 static void conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf)
 704 {
 705         strncpy2(outbuf, inbuf, outlen);
 706 }
 707
 708 static const gchar *
 709 conv_get_fallback_for_private_encoding(const gchar *encoding)
 710 {
 711         if (encoding && (encoding[0] == 'X' || encoding[0] == 'x') &&
 712             encoding[1] == '-') {
 713                 if (!g_ascii_strcasecmp(encoding, CS_X_GBK))
 714                         return CS_GBK;
 715         }
 716
 717         return encoding;
 718 }
 719
 720 CodeConverter *conv_code_converter_new(const gchar *src_charset)
 721 {
 722         CodeConverter *conv;
 723
 724         src_charset = conv_get_fallback_for_private_encoding(src_charset);
 725
 726         conv = g_new0(CodeConverter, 1);
 727         conv->code_conv_func = conv_get_code_conv_func(src_charset, NULL);
 728         conv->charset_str = g_strdup(src_charset);
 729         conv->charset = conv_get_charset_from_str(src_charset);
 730
 731         return conv;
 732 }
 733
 734 void conv_code_converter_destroy(CodeConverter *conv)
 735 {
 736         g_free(conv->charset_str);
 737         g_free(conv);
 738 }
 739
 740 gint conv_convert(CodeConverter *conv, gchar *outbuf, gint outlen,
 741                   const gchar *inbuf)
 742 {
 743         if (conv->code_conv_func != conv_noconv)
 744                 conv->code_conv_func(outbuf, outlen, inbuf);
 745         else {
 746                 gchar *str;
 747
 748                 str = conv_iconv_strdup(inbuf, conv->charset_str, NULL);
 749                 if (!str)
 750                         return -1;
 751                 else {
 752                         strncpy2(outbuf, str, outlen);
 753                         g_free(str);
 754                 }
 755         }
 756
 757         return 0;
 758 }
 759
 760 gchar *conv_codeset_strdup(const gchar *inbuf,
 761                            const gchar *src_code, const gchar *dest_code)
 762 {
 763         gchar *buf;
 764         size_t len;
 765         CodeConvFunc conv_func;
 766
 767         src_code = conv_get_fallback_for_private_encoding(src_code);
 768         conv_func = conv_get_code_conv_func(src_code, dest_code);
 769         if (conv_func != conv_noconv) {
 770                 len = (strlen(inbuf) + 1) * 3;
 771                 buf = g_malloc(len);
 772                 if (!buf) return NULL;
 773
 774                 conv_func(buf, len, inbuf);
 775                 return g_realloc(buf, strlen(buf) + 1);
 776         }
 777
 778         return conv_iconv_strdup(inbuf, src_code, dest_code);
 779 }
 780
 781 CodeConvFunc conv_get_code_conv_func(const gchar *src_charset_str,
 782                                      const gchar *dest_charset_str)
 783 {
 784         CodeConvFunc code_conv = conv_noconv;
 785         CharSet src_charset;
 786         CharSet dest_charset;
 787
 788         if (!src_charset_str)
 789                 src_charset = conv_get_locale_charset();
 790         else
 791                 src_charset = conv_get_charset_from_str(src_charset_str);
 792
 793         /* auto detection mode */
 794         if (!src_charset_str && !dest_charset_str) {
 795                 if (conv_is_ja_locale())
 796                         return conv_anytodisp;
 797                 else
 798                         return conv_noconv;
 799         }
 800
 801         dest_charset = conv_get_charset_from_str(dest_charset_str);
 802
 803         if (dest_charset == C_US_ASCII)
 804                 return conv_ustodisp;
 805
 806         switch (src_charset) {
 807         case C_US_ASCII:
 808         case C_ISO_8859_1:
 809         case C_ISO_8859_2:
 810         case C_ISO_8859_3:
 811         case C_ISO_8859_4:
 812         case C_ISO_8859_5:
 813         case C_ISO_8859_6:
 814         case C_ISO_8859_7:
 815         case C_ISO_8859_8:
 816         case C_ISO_8859_9:
 817         case C_ISO_8859_10:
 818         case C_ISO_8859_11:
 819         case C_ISO_8859_13:
 820         case C_ISO_8859_14:
 821         case C_ISO_8859_15:
 822                 break;
 823         case C_ISO_2022_JP:
 824         case C_ISO_2022_JP_2:
 825         case C_ISO_2022_JP_3:
 826                 if (dest_charset == C_AUTO)
 827                         code_conv = conv_jistodisp;
 828                 else if (dest_charset == C_EUC_JP)
 829                         code_conv = conv_jistoeuc;
 830                 else if (dest_charset == C_UTF_8)
 831                         code_conv = conv_jistoutf8;
 832                 break;
 833         case C_SHIFT_JIS:
 834                 if (dest_charset == C_AUTO)
 835                         code_conv = conv_sjistodisp;
 836                 else if (dest_charset == C_EUC_JP)
 837                         code_conv = conv_sjistoeuc;
 838                 else if (dest_charset == C_UTF_8)
 839                         code_conv = conv_sjistoutf8;
 840                 break;
 841         case C_EUC_JP:
 842                 if (dest_charset == C_AUTO)
 843                         code_conv = conv_euctodisp;
 844                 else if (dest_charset == C_ISO_2022_JP   ||
 845                          dest_charset == C_ISO_2022_JP_2 ||
 846                          dest_charset == C_ISO_2022_JP_3)
 847                         code_conv = conv_euctojis;
 848                 else if (dest_charset == C_UTF_8)
 849                         code_conv = conv_euctoutf8;
 850                 break;
 851         case C_UTF_8:
 852                 if (dest_charset == C_EUC_JP)
 853                         code_conv = conv_utf8toeuc;
 854                 else if (dest_charset == C_ISO_2022_JP   ||
 855                          dest_charset == C_ISO_2022_JP_2 ||
 856                          dest_charset == C_ISO_2022_JP_3)
 857                         code_conv = conv_utf8tojis;
 858                 break;
 859         default:
 860                 break;
 861         }
 862
 863         return code_conv;
 864 }
 865
 866 gchar *conv_iconv_strdup(const gchar *inbuf,
 867                          const gchar *src_code, const gchar *dest_code)
 868 {
 869         iconv_t cd;
 870         gchar *outbuf;
 871
 872         if (!src_code)
 873                 src_code = conv_get_outgoing_charset_str();
 874         if (!dest_code)
 875                 dest_code = CS_INTERNAL;
 876
 877         /* don't convert if src and dest codeset are identical */
 878         if (!strcasecmp(src_code, dest_code))
 879                 return g_strdup(inbuf);
 880
 881         /* don't convert if current codeset is US-ASCII */
 882         if (!strcasecmp(dest_code, CS_US_ASCII))
 883                 return g_strdup(inbuf);
 884
 885         cd = iconv_open(dest_code, src_code);
 886         if (cd == (iconv_t)-1)
 887                 return NULL;
 888
 889         outbuf = conv_iconv_strdup_with_cd(inbuf, cd);
 890
 891         iconv_close(cd);
 892
 893         return outbuf;
 894 }
 895
 896 gchar *conv_iconv_strdup_with_cd(const gchar *inbuf, iconv_t cd)
 897 {
 898         const gchar *inbuf_p;
 899         gchar *outbuf;
 900         gchar *outbuf_p;
 901         size_t in_size;
 902         size_t in_left;
 903         size_t out_size;
 904         size_t out_left;
 905         size_t n_conv;
 906         size_t len;
 907
 908         inbuf_p = inbuf;
 909         in_size = strlen(inbuf);
 910         in_left = in_size;
 911         out_size = (in_size + 1) * 2;
 912         outbuf = g_malloc(out_size);
 913         outbuf_p = outbuf;
 914         out_left = out_size;
 915
 916 #define EXPAND_BUF()                            \
 917 {                                               \
 918         len = outbuf_p - outbuf;                \
 919         out_size *= 2;                          \
 920         outbuf = g_realloc(outbuf, out_size);   \
 921         outbuf_p = outbuf + len;                \
 922         out_left = out_size - len;              \
 923 }
 924
 925         while ((n_conv = iconv(cd, (ICONV_CONST gchar **)&inbuf_p, &in_left,
 926                                &outbuf_p, &out_left)) == (size_t)-1) {
 927                 if (EILSEQ == errno) {
 928                         if (strict_mode) {
 929                                 g_free(outbuf);
 930                                 return NULL;
 931                         }
 932                         //g_print("iconv(): at %d: %s\n", in_size - in_left, g_strerror(errno));
 933                         inbuf_p++;
 934                         in_left--;
 935                         if (out_left == 0) {
 936                                 EXPAND_BUF();
 937                         }
 938                         *outbuf_p++ = SUBST_CHAR;
 939                         out_left--;
 940                 } else if (EINVAL == errno) {
 941                         break;
 942                 } else if (E2BIG == errno) {
 943                         EXPAND_BUF();
 944                 } else {
 945                         g_warning("conv_iconv_strdup(): %s\n",
 946                                   g_strerror(errno));
 947                         break;
 948                 }
 949         }
 950
 951         while ((n_conv = iconv(cd, NULL, NULL, &outbuf_p, &out_left)) ==
 952                (size_t)-1) {
 953                 if (E2BIG == errno) {
 954                         EXPAND_BUF();
 955                 } else {
 956                         g_warning("conv_iconv_strdup(): %s\n",
 957                                   g_strerror(errno));
 958                         break;
 959                 }
 960         }
 961
 962 #undef EXPAND_BUF
 963
 964         len = outbuf_p - outbuf;
 965         outbuf = g_realloc(outbuf, len + 1);
 966         outbuf[len] = '\0';
 967
 968         return outbuf;
 969 }
 970
 971 static const struct {
 972         CharSet charset;
 973         gchar *const name;
 974 } charsets[] = {
 975         {C_US_ASCII,            CS_US_ASCII},
 976         {C_US_ASCII,            CS_ANSI_X3_4_1968},
 977         {C_UTF_8,               CS_UTF_8},
 978         {C_UTF_7,               CS_UTF_7},
 979         {C_ISO_8859_1,          CS_ISO_8859_1},
 980         {C_ISO_8859_2,          CS_ISO_8859_2},
 981         {C_ISO_8859_3,          CS_ISO_8859_3},
 982         {C_ISO_8859_4,          CS_ISO_8859_4},
 983         {C_ISO_8859_5,          CS_ISO_8859_5},
 984         {C_ISO_8859_6,          CS_ISO_8859_6},
 985         {C_ISO_8859_7,          CS_ISO_8859_7},
 986         {C_ISO_8859_8,          CS_ISO_8859_8},
 987         {C_ISO_8859_9,          CS_ISO_8859_9},
 988         {C_ISO_8859_10,         CS_ISO_8859_10},
 989         {C_ISO_8859_11,         CS_ISO_8859_11},
 990         {C_ISO_8859_13,         CS_ISO_8859_13},
 991         {C_ISO_8859_14,         CS_ISO_8859_14},
 992         {C_ISO_8859_15,         CS_ISO_8859_15},
 993         {C_BALTIC,              CS_BALTIC},
 994         {C_CP1250,              CS_CP1250},
 995         {C_CP1251,              CS_CP1251},
 996         {C_CP1252,              CS_CP1252},
 997         {C_CP1253,              CS_CP1253},
 998         {C_CP1254,              CS_CP1254},
 999         {C_CP1255,              CS_CP1255},
1000         {C_CP1256,              CS_CP1256},
1001         {C_CP1257,              CS_CP1257},
1002         {C_CP1258,              CS_CP1258},
1003         {C_WINDOWS_1250,        CS_WINDOWS_1250},
1004         {C_WINDOWS_1251,        CS_WINDOWS_1251},
1005         {C_WINDOWS_1252,        CS_WINDOWS_1252},
1006         {C_WINDOWS_1253,        CS_WINDOWS_1253},
1007         {C_WINDOWS_1254,        CS_WINDOWS_1254},
1008         {C_WINDOWS_1255,        CS_WINDOWS_1255},
1009         {C_WINDOWS_1256,        CS_WINDOWS_1256},
1010         {C_WINDOWS_1257,        CS_WINDOWS_1257},
1011         {C_WINDOWS_1258,        CS_WINDOWS_1258},
1012         {C_KOI8_R,              CS_KOI8_R},
1013         {C_KOI8_T,              CS_KOI8_T},
1014         {C_KOI8_U,              CS_KOI8_U},
1015         {C_ISO_2022_JP,         CS_ISO_2022_JP},
1016         {C_ISO_2022_JP_2,       CS_ISO_2022_JP_2},
1017         {C_ISO_2022_JP_3,       CS_ISO_2022_JP_3},
1018         {C_EUC_JP,              CS_EUC_JP},
1019         {C_EUC_JP,              CS_EUCJP},
1020         {C_EUC_JP_MS,           CS_EUC_JP_MS},
1021         {C_SHIFT_JIS,           CS_SHIFT_JIS},
1022         {C_SHIFT_JIS,           CS_SHIFT__JIS},
1023         {C_SHIFT_JIS,           CS_SJIS},
1024         {C_ISO_2022_KR,         CS_ISO_2022_KR},
1025         {C_EUC_KR,              CS_EUC_KR},
1026         {C_ISO_2022_CN,         CS_ISO_2022_CN},
1027         {C_EUC_CN,              CS_EUC_CN},
1028         {C_GB2312,              CS_GB2312},
1029         {C_GBK,                 CS_GBK},
1030         {C_EUC_TW,              CS_EUC_TW},
1031         {C_BIG5,                CS_BIG5},
1032         {C_BIG5_HKSCS,          CS_BIG5_HKSCS},
1033         {C_TIS_620,             CS_TIS_620},
1034         {C_WINDOWS_874,         CS_WINDOWS_874},
1035         {C_GEORGIAN_PS,         CS_GEORGIAN_PS},
1036         {C_TCVN5712_1,          CS_TCVN5712_1},
1037 };
1038
1039 static const struct {
1040         gchar *const locale;
1041         CharSet charset;
1042         CharSet out_charset;
1043 } locale_table[] = {
1044         {"ja_JP.eucJP"  , C_EUC_JP      , C_ISO_2022_JP},
1045         {"ja_JP.EUC-JP" , C_EUC_JP      , C_ISO_2022_JP},
1046         {"ja_JP.EUC"    , C_EUC_JP      , C_ISO_2022_JP},
1047         {"ja_JP.ujis"   , C_EUC_JP      , C_ISO_2022_JP},
1048         {"ja_JP.SJIS"   , C_SHIFT_JIS   , C_ISO_2022_JP},
1049         {"ja_JP.JIS"    , C_ISO_2022_JP , C_ISO_2022_JP},
1050 #ifdef G_OS_WIN32
1051         {"ja_JP"        , C_SHIFT_JIS   , C_ISO_2022_JP},
1052 #else
1053         {"ja_JP"        , C_EUC_JP      , C_ISO_2022_JP},
1054 #endif
1055         {"ko_KR.EUC-KR" , C_EUC_KR      , C_EUC_KR},
1056         {"ko_KR"        , C_EUC_KR      , C_EUC_KR},
1057         {"zh_CN.GB2312" , C_GB2312      , C_GB2312},
1058         {"zh_CN.GBK"    , C_GBK         , C_GBK},
1059         {"zh_CN"        , C_GB2312      , C_GB2312},
1060         {"zh_HK"        , C_BIG5_HKSCS  , C_BIG5_HKSCS},
1061         {"zh_TW.eucTW"  , C_EUC_TW      , C_BIG5},
1062         {"zh_TW.EUC-TW" , C_EUC_TW      , C_BIG5},
1063         {"zh_TW.Big5"   , C_BIG5        , C_BIG5},
1064         {"zh_TW"        , C_BIG5        , C_BIG5},
1065
1066         {"ru_RU.KOI8-R" , C_KOI8_R      , C_KOI8_R},
1067         {"ru_RU.KOI8R"  , C_KOI8_R      , C_KOI8_R},
1068         {"ru_RU.CP1251" , C_WINDOWS_1251, C_KOI8_R},
1069         {"ru_RU"        , C_ISO_8859_5  , C_KOI8_R},
1070         {"tg_TJ"        , C_KOI8_T      , C_KOI8_T},
1071         {"ru_UA"        , C_KOI8_U      , C_KOI8_U},
1072         {"uk_UA.CP1251" , C_WINDOWS_1251, C_KOI8_U},
1073         {"uk_UA"        , C_KOI8_U      , C_KOI8_U},
1074
1075         {"be_BY"        , C_WINDOWS_1251, C_WINDOWS_1251},
1076         {"bg_BG"        , C_WINDOWS_1251, C_WINDOWS_1251},
1077
1078         {"yi_US"        , C_WINDOWS_1255, C_WINDOWS_1255},
1079
1080         {"af_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1081         {"br_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1082         {"ca_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1083         {"da_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1084         {"de_AT"        , C_ISO_8859_1  , C_ISO_8859_1},
1085         {"de_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1086         {"de_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1087         {"de_DE"        , C_ISO_8859_1  , C_ISO_8859_1},
1088         {"de_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1089         {"en_AU"        , C_ISO_8859_1  , C_ISO_8859_1},
1090         {"en_BW"        , C_ISO_8859_1  , C_ISO_8859_1},
1091         {"en_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1092         {"en_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1093         {"en_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1094         {"en_HK"        , C_ISO_8859_1  , C_ISO_8859_1},
1095         {"en_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1096         {"en_NZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1097         {"en_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1098         {"en_SG"        , C_ISO_8859_1  , C_ISO_8859_1},
1099         {"en_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1100         {"en_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1101         {"en_ZW"        , C_ISO_8859_1  , C_ISO_8859_1},
1102         {"es_AR"        , C_ISO_8859_1  , C_ISO_8859_1},
1103         {"es_BO"        , C_ISO_8859_1  , C_ISO_8859_1},
1104         {"es_CL"        , C_ISO_8859_1  , C_ISO_8859_1},
1105         {"es_CO"        , C_ISO_8859_1  , C_ISO_8859_1},
1106         {"es_CR"        , C_ISO_8859_1  , C_ISO_8859_1},
1107         {"es_DO"        , C_ISO_8859_1  , C_ISO_8859_1},
1108         {"es_EC"        , C_ISO_8859_1  , C_ISO_8859_1},
1109         {"es_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1110         {"es_GT"        , C_ISO_8859_1  , C_ISO_8859_1},
1111         {"es_HN"        , C_ISO_8859_1  , C_ISO_8859_1},
1112         {"es_MX"        , C_ISO_8859_1  , C_ISO_8859_1},
1113         {"es_NI"        , C_ISO_8859_1  , C_ISO_8859_1},
1114         {"es_PA"        , C_ISO_8859_1  , C_ISO_8859_1},
1115         {"es_PE"        , C_ISO_8859_1  , C_ISO_8859_1},
1116         {"es_PR"        , C_ISO_8859_1  , C_ISO_8859_1},
1117         {"es_PY"        , C_ISO_8859_1  , C_ISO_8859_1},
1118         {"es_SV"        , C_ISO_8859_1  , C_ISO_8859_1},
1119         {"es_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1120         {"es_UY"        , C_ISO_8859_1  , C_ISO_8859_1},
1121         {"es_VE"        , C_ISO_8859_1  , C_ISO_8859_1},
1122         {"et_EE"        , C_ISO_8859_1  , C_ISO_8859_1},
1123         {"eu_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1124         {"fi_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1125         {"fo_FO"        , C_ISO_8859_1  , C_ISO_8859_1},
1126         {"fr_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1127         {"fr_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1128         {"fr_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1129         {"fr_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1130         {"fr_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1131         {"ga_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1132         {"gl_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1133         {"gv_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1134         {"id_ID"        , C_ISO_8859_1  , C_ISO_8859_1},
1135         {"is_IS"        , C_ISO_8859_1  , C_ISO_8859_1},
1136         {"it_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1137         {"it_IT"        , C_ISO_8859_1  , C_ISO_8859_1},
1138         {"kl_GL"        , C_ISO_8859_1  , C_ISO_8859_1},
1139         {"kw_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1140         {"ms_MY"        , C_ISO_8859_1  , C_ISO_8859_1},
1141         {"nl_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1142         {"nl_NL"        , C_ISO_8859_1  , C_ISO_8859_1},
1143         {"nn_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1144         {"no_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1145         {"oc_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1146         {"pt_BR"        , C_ISO_8859_1  , C_ISO_8859_1},
1147         {"pt_PT"        , C_ISO_8859_1  , C_ISO_8859_1},
1148         {"sq_AL"        , C_ISO_8859_1  , C_ISO_8859_1},
1149         {"sv_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1150         {"sv_SE"        , C_ISO_8859_1  , C_ISO_8859_1},
1151         {"tl_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1152         {"uz_UZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1153         {"wa_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1154
1155         {"bs_BA"        , C_ISO_8859_2  , C_ISO_8859_2},
1156         {"cs_CZ"        , C_ISO_8859_2  , C_ISO_8859_2},
1157         {"hr_HR"        , C_ISO_8859_2  , C_ISO_8859_2},
1158         {"hu_HU"        , C_ISO_8859_2  , C_ISO_8859_2},
1159         {"pl_PL"        , C_ISO_8859_2  , C_ISO_8859_2},
1160         {"ro_RO"        , C_ISO_8859_2  , C_ISO_8859_2},
1161         {"sk_SK"        , C_ISO_8859_2  , C_ISO_8859_2},
1162         {"sl_SI"        , C_ISO_8859_2  , C_ISO_8859_2},
1163
1164         {"sr_YU@cyrillic"       , C_ISO_8859_5  , C_ISO_8859_5},
1165         {"sr_YU"                , C_ISO_8859_2  , C_ISO_8859_2},
1166
1167         {"mt_MT"                , C_ISO_8859_3  , C_ISO_8859_3},
1168
1169         {"lt_LT.iso88594"       , C_ISO_8859_4  , C_ISO_8859_4},
1170         {"lt_LT.ISO8859-4"      , C_ISO_8859_4  , C_ISO_8859_4},
1171         {"lt_LT.ISO_8859-4"     , C_ISO_8859_4  , C_ISO_8859_4},
1172         {"lt_LT"                , C_ISO_8859_13 , C_ISO_8859_13},
1173
1174         {"mk_MK"        , C_ISO_8859_5  , C_ISO_8859_5},
1175
1176         {"ar_AE"        , C_ISO_8859_6  , C_ISO_8859_6},
1177         {"ar_BH"        , C_ISO_8859_6  , C_ISO_8859_6},
1178         {"ar_DZ"        , C_ISO_8859_6  , C_ISO_8859_6},
1179         {"ar_EG"        , C_ISO_8859_6  , C_ISO_8859_6},
1180         {"ar_IQ"        , C_ISO_8859_6  , C_ISO_8859_6},
1181         {"ar_JO"        , C_ISO_8859_6  , C_ISO_8859_6},
1182         {"ar_KW"        , C_ISO_8859_6  , C_ISO_8859_6},
1183         {"ar_LB"        , C_ISO_8859_6  , C_ISO_8859_6},
1184         {"ar_LY"        , C_ISO_8859_6  , C_ISO_8859_6},
1185         {"ar_MA"        , C_ISO_8859_6  , C_ISO_8859_6},
1186         {"ar_OM"        , C_ISO_8859_6  , C_ISO_8859_6},
1187         {"ar_QA"        , C_ISO_8859_6  , C_ISO_8859_6},
1188         {"ar_SA"        , C_ISO_8859_6  , C_ISO_8859_6},
1189         {"ar_SD"        , C_ISO_8859_6  , C_ISO_8859_6},
1190         {"ar_SY"        , C_ISO_8859_6  , C_ISO_8859_6},
1191         {"ar_TN"        , C_ISO_8859_6  , C_ISO_8859_6},
1192         {"ar_YE"        , C_ISO_8859_6  , C_ISO_8859_6},
1193
1194         {"el_GR"        , C_ISO_8859_7  , C_ISO_8859_7},
1195         {"he_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1196         {"iw_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1197         {"tr_TR"        , C_ISO_8859_9  , C_ISO_8859_9},
1198
1199         {"lv_LV"        , C_ISO_8859_13 , C_ISO_8859_13},
1200         {"mi_NZ"        , C_ISO_8859_13 , C_ISO_8859_13},
1201
1202         {"cy_GB"        , C_ISO_8859_14 , C_ISO_8859_14},
1203
1204         {"ar_IN"        , C_UTF_8       , C_UTF_8},
1205         {"en_IN"        , C_UTF_8       , C_UTF_8},
1206         {"se_NO"        , C_UTF_8       , C_UTF_8},
1207         {"ta_IN"        , C_UTF_8       , C_UTF_8},
1208         {"te_IN"        , C_UTF_8       , C_UTF_8},
1209         {"ur_PK"        , C_UTF_8       , C_UTF_8},
1210
1211         {"th_TH"        , C_TIS_620     , C_TIS_620},
1212         /* {"th_TH"     , C_WINDOWS_874}, */
1213         /* {"th_TH"     , C_ISO_8859_11}, */
1214
1215         {"ka_GE"        , C_GEORGIAN_PS , C_GEORGIAN_PS},
1216         {"vi_VN.TCVN"   , C_TCVN5712_1  , C_TCVN5712_1},
1217
1218         {"C"                    , C_US_ASCII    , C_US_ASCII},
1219         {"POSIX"                , C_US_ASCII    , C_US_ASCII},
1220         {"ANSI_X3.4-1968"       , C_US_ASCII    , C_US_ASCII},
1221 };
1222
1223 static GHashTable *conv_get_charset_to_str_table(void)
1224 {
1225         static GHashTable *table;
1226         gint i;
1227
1228         if (table)
1229                 return table;
1230
1231         table = g_hash_table_new(NULL, g_direct_equal);
1232
1233         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1234                 if (g_hash_table_lookup(table, GUINT_TO_POINTER(charsets[i].charset))
1235                     == NULL) {
1236                         g_hash_table_insert
1237                                 (table, GUINT_TO_POINTER(charsets[i].charset),
1238                                  charsets[i].name);
1239                 }
1240         }
1241
1242         return table;
1243 }
1244
1245 static GHashTable *conv_get_charset_from_str_table(void)
1246 {
1247         static GHashTable *table;
1248         gint i;
1249
1250         if (table)
1251                 return table;
1252
1253         table = g_hash_table_new(str_case_hash, str_case_equal);
1254
1255         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1256                 g_hash_table_insert(table, charsets[i].name,
1257                                     GUINT_TO_POINTER(charsets[i].charset));
1258         }
1259
1260         return table;
1261 }
1262
1263 const gchar *conv_get_charset_str(CharSet charset)
1264 {
1265         GHashTable *table;
1266
1267         table = conv_get_charset_to_str_table();
1268         return g_hash_table_lookup(table, GUINT_TO_POINTER(charset));
1269 }
1270
1271 CharSet conv_get_charset_from_str(const gchar *charset)
1272 {
1273         GHashTable *table;
1274
1275         if (!charset) return C_AUTO;
1276
1277         table = conv_get_charset_from_str_table();
1278         return GPOINTER_TO_UINT(g_hash_table_lookup(table, charset));
1279 }
1280
1281 CharSet conv_get_locale_charset(void)
1282 {
1283         static CharSet cur_charset = -1;
1284         const gchar *cur_locale;
1285         const gchar *p;
1286         gint i;
1287
1288         if (cur_charset != -1)
1289                 return cur_charset;
1290
1291         cur_locale = conv_get_current_locale();
1292         if (!cur_locale) {
1293                 cur_charset = C_US_ASCII;
1294                 return cur_charset;
1295         }
1296
1297         if (strcasestr(cur_locale, "UTF-8")) {
1298                 cur_charset = C_UTF_8;
1299                 return cur_charset;
1300         }
1301
1302         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1303                 cur_charset = C_ISO_8859_15;
1304                 return cur_charset;
1305         }
1306
1307         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1308                 const gchar *p;
1309
1310                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1311                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1312                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1313                                  strlen(locale_table[i].locale))) {
1314                         cur_charset = locale_table[i].charset;
1315                         return cur_charset;
1316                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1317                          !strchr(p + 1, '.')) {
1318                         if (strlen(cur_locale) == 2 &&
1319                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1320                                 cur_charset = locale_table[i].charset;
1321                                 return cur_charset;
1322                         }
1323                 }
1324         }
1325
1326         cur_charset = C_AUTO;
1327         return cur_charset;
1328 }
1329
1330 static CharSet conv_get_locale_charset_no_utf8(void)
1331 {
1332         static CharSet cur_charset = -1;
1333         const gchar *cur_locale;
1334         const gchar *p;
1335         gchar *tmp;
1336         gint i;
1337
1338         if (prefs_common.broken_are_utf8)
1339                 return conv_get_locale_charset();
1340
1341         if (cur_charset != -1)
1342                 return cur_charset;
1343
1344         cur_locale = conv_get_current_locale();
1345         if (!cur_locale) {
1346                 cur_charset = C_US_ASCII;
1347                 return cur_charset;
1348         }
1349
1350         if (strcasestr(cur_locale, "UTF-8")) {
1351                 tmp = g_strdup(cur_locale);
1352                 *(strcasestr(tmp, ".UTF-8")) = '\0';
1353                 cur_locale = tmp;
1354         }
1355
1356         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1357                 cur_charset = C_ISO_8859_15;
1358                 return cur_charset;
1359         }
1360
1361         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1362                 const gchar *p;
1363
1364                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1365                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1366                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1367                                  strlen(locale_table[i].locale))) {
1368                         cur_charset = locale_table[i].charset;
1369                         return cur_charset;
1370                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1371                          !strchr(p + 1, '.')) {
1372                         if (strlen(cur_locale) == 2 &&
1373                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1374                                 cur_charset = locale_table[i].charset;
1375                                 return cur_charset;
1376                         }
1377                 }
1378         }
1379
1380         cur_charset = C_AUTO;
1381         return cur_charset;
1382 }
1383
1384 const gchar *conv_get_locale_charset_str(void)
1385 {
1386         static const gchar *codeset = NULL;
1387
1388         if (!codeset)
1389                 codeset = conv_get_charset_str(conv_get_locale_charset());
1390
1391         return codeset ? codeset : CS_INTERNAL;
1392 }
1393
1394 const gchar *conv_get_locale_charset_str_no_utf8(void)
1395 {
1396         static const gchar *codeset = NULL;
1397
1398         if (!codeset)
1399                 codeset = conv_get_charset_str(conv_get_locale_charset_no_utf8());
1400
1401         return codeset ? codeset : CS_INTERNAL;
1402 }
1403
1404 CharSet conv_get_internal_charset(void)
1405 {
1406         return C_INTERNAL;
1407 }
1408
1409 const gchar *conv_get_internal_charset_str(void)
1410 {
1411         return CS_INTERNAL;
1412 }
1413
1414 CharSet conv_get_outgoing_charset(void)
1415 {
1416         static CharSet out_charset = -1;
1417         const gchar *cur_locale;
1418         const gchar *p;
1419         gint i;
1420
1421         if (out_charset != -1)
1422                 return out_charset;
1423
1424         cur_locale = conv_get_current_locale();
1425         if (!cur_locale) {
1426                 out_charset = C_AUTO;
1427                 return out_charset;
1428         }
1429
1430         if (strcasestr(cur_locale, "UTF-8")) {
1431                 out_charset = C_UTF_8;
1432                 return out_charset;
1433         }
1434
1435         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1436                 out_charset = C_ISO_8859_15;
1437                 return out_charset;
1438         }
1439
1440         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1441                 const gchar *p;
1442
1443                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1444                                  strlen(locale_table[i].locale))) {
1445                         out_charset = locale_table[i].out_charset;
1446                         break;
1447                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1448                          !strchr(p + 1, '.')) {
1449                         if (strlen(cur_locale) == 2 &&
1450                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1451                                 out_charset = locale_table[i].out_charset;
1452                                 break;
1453                         }
1454                 }
1455         }
1456
1457         return out_charset;
1458 }
1459
1460 const gchar *conv_get_outgoing_charset_str(void)
1461 {
1462         CharSet out_charset;
1463         const gchar *str;
1464
1465         out_charset = conv_get_outgoing_charset();
1466         str = conv_get_charset_str(out_charset);
1467
1468         return str ? str : CS_UTF_8;
1469 }
1470
1471 gboolean conv_is_multibyte_encoding(CharSet encoding)
1472 {
1473         switch (encoding) {
1474         case C_EUC_JP:
1475         case C_EUC_JP_MS:
1476         case C_EUC_KR:
1477         case C_EUC_TW:
1478         case C_EUC_CN:
1479         case C_ISO_2022_JP:
1480         case C_ISO_2022_JP_2:
1481         case C_ISO_2022_JP_3:
1482         case C_ISO_2022_KR:
1483         case C_ISO_2022_CN:
1484         case C_SHIFT_JIS:
1485         case C_GB2312:
1486         case C_GBK:
1487         case C_BIG5:
1488         case C_UTF_8:
1489         case C_UTF_7:
1490                 return TRUE;
1491         default:
1492                 return FALSE;
1493         }
1494 }
1495
1496 const gchar *conv_get_current_locale(void)
1497 {
1498         const gchar *cur_locale;
1499
1500 #ifdef G_OS_WIN32
1501         cur_locale = g_win32_getlocale();
1502 #else
1503         cur_locale = g_getenv("LC_ALL");
1504         if (!cur_locale) cur_locale = g_getenv("LC_CTYPE");
1505         if (!cur_locale) cur_locale = g_getenv("LANG");
1506         if (!cur_locale) cur_locale = setlocale(LC_CTYPE, NULL);
1507 #endif /* G_OS_WIN32 */
1508
1509         debug_print("current locale: %s\n",
1510                     cur_locale ? cur_locale : "(none)");
1511
1512         return cur_locale;
1513 }
1514
1515 gboolean conv_is_ja_locale(void)
1516 {
1517         static gint is_ja_locale = -1;
1518         const gchar *cur_locale;
1519
1520         if (is_ja_locale != -1)
1521                 return is_ja_locale != 0;
1522
1523         is_ja_locale = 0;
1524         cur_locale = conv_get_current_locale();
1525         if (cur_locale) {
1526                 if (g_ascii_strncasecmp(cur_locale, "ja", 2) == 0)
1527                         is_ja_locale = 1;
1528         }
1529
1530         return is_ja_locale != 0;
1531 }
1532
1533 gchar *conv_unmime_header(const gchar *str, const gchar *default_encoding)
1534 {
1535         gchar buf[BUFFSIZE];
1536
1537         if (is_ascii_str(str))
1538                 return unmime_header(str);
1539
1540         if (default_encoding) {
1541                 gchar *utf8_buf;
1542
1543                 utf8_buf = conv_codeset_strdup
1544                         (str, default_encoding, CS_INTERNAL);
1545                 if (utf8_buf) {
1546                         gchar *decoded_str;
1547
1548                         decoded_str = unmime_header(utf8_buf);
1549                         g_free(utf8_buf);
1550                         return decoded_str;
1551                 }
1552         }
1553
1554         if (conv_is_ja_locale())
1555                 conv_anytodisp(buf, sizeof(buf), str);
1556         else
1557                 conv_localetodisp(buf, sizeof(buf), str);
1558
1559         return unmime_header(buf);
1560 }
1561
1562 #define MAX_LINELEN             76
1563 #define MAX_HARD_LINELEN        996
1564 #define MIMESEP_BEGIN           "=?"
1565 #define MIMESEP_END             "?="
1566
1567 #define LBREAK_IF_REQUIRED(cond, is_plain_text)                         \
1568 {                                                                       \
1569         if (len - (destp - (guchar *)dest) < MAX_LINELEN + 2) {         \
1570                 *destp = '\0';                                          \
1571                 return;                                                 \
1572         }                                                               \
1573                                                                         \
1574         if ((cond) && *srcp) {                                          \
1575                 if (destp > (guchar *)dest && left < MAX_LINELEN - 1) { \
1576                         if (isspace(*(destp - 1)))                      \
1577                                 destp--;                                \
1578                         else if (is_plain_text && isspace(*srcp))       \
1579                                 srcp++;                                 \
1580                         if (*srcp) {                                    \
1581                                 *destp++ = '\n';                        \
1582                                 *destp++ = ' ';                         \
1583                                 left = MAX_LINELEN - 1;                 \
1584                         }                                               \
1585                 }                                                       \
1586         }                                                               \
1587 }
1588
1589 void conv_encode_header_full(gchar *dest, gint len, const gchar *src,
1590                         gint header_len, gboolean addr_field,
1591                         const gchar *out_encoding_)
1592 {
1593         const gchar *cur_encoding;
1594         const gchar *out_encoding;
1595         gint mimestr_len;
1596         gchar *mimesep_enc;
1597         gint left;
1598         const guchar *srcp = src;
1599         guchar *destp = dest;
1600         gboolean use_base64;
1601
1602         g_return_if_fail(g_utf8_validate(src, -1, NULL) == TRUE);
1603
1604         if (MB_CUR_MAX > 1) {
1605                 use_base64 = TRUE;
1606                 mimesep_enc = "?B?";
1607         } else {
1608                 use_base64 = FALSE;
1609                 mimesep_enc = "?Q?";
1610         }
1611
1612         cur_encoding = CS_INTERNAL;
1613
1614         if (out_encoding_)
1615                 out_encoding = out_encoding_;
1616         else
1617                 out_encoding = conv_get_outgoing_charset_str();
1618
1619         if (!strcmp(out_encoding, CS_US_ASCII))
1620                 out_encoding = CS_ISO_8859_1;
1621
1622         mimestr_len = strlen(MIMESEP_BEGIN) + strlen(out_encoding) +
1623                 strlen(mimesep_enc) + strlen(MIMESEP_END);
1624
1625         left = MAX_LINELEN - header_len;
1626
1627         while (*srcp) {
1628                 LBREAK_IF_REQUIRED(left <= 0, TRUE);
1629
1630                 while (isspace(*srcp)) {
1631                         *destp++ = *srcp++;
1632                         left--;
1633                         LBREAK_IF_REQUIRED(left <= 0, TRUE);
1634                 }
1635
1636                 /* output as it is if the next word is ASCII string */
1637                 if (!is_next_nonascii(srcp)) {
1638                         gint word_len;
1639
1640                         word_len = get_next_word_len(srcp);
1641                         LBREAK_IF_REQUIRED(left < word_len, TRUE);
1642                         while (word_len > 0) {
1643                                 LBREAK_IF_REQUIRED(left + (MAX_HARD_LINELEN - MAX_LINELEN) <= 0, TRUE)
1644                                 *destp++ = *srcp++;
1645                                 left--;
1646                                 word_len--;
1647                         }
1648
1649                         continue;
1650                 }
1651
1652                 /* don't include parentheses in encoded strings */
1653                 if (addr_field && (*srcp == '(' || *srcp == ')')) {
1654                         LBREAK_IF_REQUIRED(left < 2, FALSE);
1655                         *destp++ = *srcp++;
1656                         left--;
1657                 }
1658
1659                 while (1) {
1660                         gint mb_len = 0;
1661                         gint cur_len = 0;
1662                         gchar *part_str;
1663                         gchar *out_str;
1664                         gchar *enc_str;
1665                         const guchar *p = srcp;
1666                         gint out_str_len;
1667                         gint out_enc_str_len;
1668                         gint mime_block_len;
1669                         gboolean cont = FALSE;
1670
1671                         while (*p != '\0') {
1672                                 if (isspace(*p) && !is_next_nonascii(p + 1))
1673                                         break;
1674                                 /* don't include parentheses in encoded
1675                                    strings */
1676                                 if (addr_field && (*p == '(' || *p == ')'))
1677                                         break;
1678
1679                                 mb_len = g_utf8_skip[*p];
1680
1681                                 Xstrndup_a(part_str, srcp, cur_len + mb_len, );
1682                                 out_str = conv_codeset_strdup
1683                                         (part_str, cur_encoding, out_encoding);
1684                                 if (!out_str) {
1685                                         if (strict_mode) {
1686                                                 *dest = '\0';
1687                                                 return;
1688                                         } else {
1689                                                 g_warning("conv_encode_header(): code conversion failed\n");
1690                                                 conv_unreadable_8bit(part_str);
1691                                                 out_str = g_strdup(part_str);
1692                                         }
1693                                 }
1694                                 out_str_len = strlen(out_str);
1695
1696                                 if (use_base64)
1697                                         out_enc_str_len = B64LEN(out_str_len);
1698                                 else
1699                                         out_enc_str_len =
1700                                                 qp_get_q_encoding_len(out_str);
1701
1702                                 g_free(out_str);
1703
1704                                 if (mimestr_len + out_enc_str_len <= left) {
1705                                         cur_len += mb_len;
1706                                         p += mb_len;
1707                                 } else if (cur_len == 0) {
1708                                         LBREAK_IF_REQUIRED(1, FALSE);
1709                                         continue;
1710                                 } else {
1711                                         cont = TRUE;
1712                                         break;
1713                                 }
1714                         }
1715
1716                         if (cur_len > 0) {
1717                                 Xstrndup_a(part_str, srcp, cur_len, );
1718                                 out_str = conv_codeset_strdup
1719                                         (part_str, cur_encoding, out_encoding);
1720                                 if (!out_str) {
1721                                         g_warning("conv_encode_header(): code conversion failed\n");
1722                                         conv_unreadable_8bit(part_str);
1723                                         out_str = g_strdup(part_str);
1724                                 }
1725                                 out_str_len = strlen(out_str);
1726
1727                                 if (use_base64)
1728                                         out_enc_str_len = B64LEN(out_str_len);
1729                                 else
1730                                         out_enc_str_len =
1731                                                 qp_get_q_encoding_len(out_str);
1732
1733                                 Xalloca(enc_str, out_enc_str_len + 1, );
1734                                 if (use_base64)
1735                                         base64_encode(enc_str, out_str, out_str_len);
1736                                 else
1737                                         qp_q_encode(enc_str, out_str);
1738
1739                                 g_free(out_str);
1740
1741                                 /* output MIME-encoded string block */
1742                                 mime_block_len = mimestr_len + strlen(enc_str);
1743                                 g_snprintf(destp, mime_block_len + 1,
1744                                            MIMESEP_BEGIN "%s%s%s" MIMESEP_END,
1745                                            out_encoding, mimesep_enc, enc_str);
1746                                 destp += mime_block_len;
1747                                 srcp += cur_len;
1748
1749                                 left -= mime_block_len;
1750                         }
1751
1752                         LBREAK_IF_REQUIRED(cont, FALSE);
1753
1754                         if (cur_len == 0)
1755                                 break;
1756                 }
1757         }
1758
1759         *destp = '\0';
1760 }
1761
1762 void conv_encode_header(gchar *dest, gint len, const gchar *src,
1763                         gint header_len, gboolean addr_field)
1764 {
1765         conv_encode_header_full(dest,len,src,header_len,addr_field,NULL);
1766 }
1767
1768 #undef LBREAK_IF_REQUIRED
1769 gchar *conv_filename_from_utf8(const gchar *utf8_file)
1770 {
1771         gchar *fs_file;
1772         GError *error = NULL;
1773
1774         fs_file = g_filename_from_utf8(utf8_file, -1, NULL, NULL, &error);
1775         if (error) {
1776                 g_warning("failed to convert encoding of file name: %s\n",
1777                           error->message);
1778                 g_error_free(error);
1779         }
1780         if (!fs_file)
1781                 fs_file = g_strdup(utf8_file);
1782
1783         return fs_file;
1784 }
1785
1786 gchar *conv_filename_to_utf8(const gchar *fs_file)
1787 {
1788         gchar *utf8_file = NULL;
1789         GError *error = NULL;
1790
1791         utf8_file = g_filename_to_utf8(fs_file, -1, NULL, NULL, &error);
1792         if (error) {
1793                 g_warning("failed to convert encoding of file name: %s\n",
1794                           error->message);
1795                 g_error_free(error);
1796         }
1797
1798         if (!utf8_file || !g_utf8_validate(utf8_file, -1, NULL)) {
1799                 g_free(utf8_file);
1800                 utf8_file = g_strdup(fs_file);
1801                 conv_unreadable_8bit(utf8_file);
1802         }
1803
1804         return utf8_file;
1805 }