src/codeconv.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 Hiroyuki Yamamoto and the Claws Mail team
   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 3 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, see <http://www.gnu.org/licenses/>.
  17  *
  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 "codeconv.h"
  38 #include "unmime.h"
  39 #include "base64.h"
  40 #include "quoted-printable.h"
  41 #include "utils.h"
  42 #include "prefs_common.h"
  43
  44 /* For unknown reasons the inconv.m4 macro undefs that macro if no
  45    const is needed.  This would break the code below so we define it. */
  46 #ifndef ICONV_CONST
  47 #define ICONV_CONST
  48 #endif
  49
  50 typedef enum
  51 {
  52         JIS_ASCII,
  53         JIS_KANJI,
  54         JIS_HWKANA,
  55         JIS_AUXKANJI
  56 } JISState;
  57
  58 #define SUBST_CHAR      0x5f;
  59 #define ESC             '\033'
  60
  61 #define iseuckanji(c) \
  62         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xfe)
  63 #define iseuchwkana1(c) \
  64         (((c) & 0xff) == 0x8e)
  65 #define iseuchwkana2(c) \
  66         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xdf)
  67 #define iseucaux(c) \
  68         (((c) & 0xff) == 0x8f)
  69 #define issjiskanji1(c) \
  70         ((((c) & 0xff) >= 0x81 && ((c) & 0xff) <= 0x9f) || \
  71          (((c) & 0xff) >= 0xe0 && ((c) & 0xff) <= 0xfc))
  72 #define issjiskanji2(c) \
  73         ((((c) & 0xff) >= 0x40 && ((c) & 0xff) <= 0x7e) || \
  74          (((c) & 0xff) >= 0x80 && ((c) & 0xff) <= 0xfc))
  75 #define issjishwkana(c) \
  76         (((c) & 0xff) >= 0xa1 && ((c) & 0xff) <= 0xdf)
  77
  78 #define K_IN()                          \
  79         if (state != JIS_KANJI) {       \
  80                 *out++ = ESC;           \
  81                 *out++ = '$';           \
  82                 *out++ = 'B';           \
  83                 state = JIS_KANJI;      \
  84         }
  85
  86 #define K_OUT()                         \
  87         if (state != JIS_ASCII) {       \
  88                 *out++ = ESC;           \
  89                 *out++ = '(';           \
  90                 *out++ = 'B';           \
  91                 state = JIS_ASCII;      \
  92         }
  93
  94 #define HW_IN()                         \
  95         if (state != JIS_HWKANA) {      \
  96                 *out++ = ESC;           \
  97                 *out++ = '(';           \
  98                 *out++ = 'I';           \
  99                 state = JIS_HWKANA;     \
 100         }
 101
 102 #define AUX_IN()                        \
 103         if (state != JIS_AUXKANJI) {    \
 104                 *out++ = ESC;           \
 105                 *out++ = '$';           \
 106                 *out++ = '(';           \
 107                 *out++ = 'D';           \
 108                 state = JIS_AUXKANJI;   \
 109         }
 110
 111 static CodeConvFunc conv_get_code_conv_func     (const gchar    *src_charset_str,
 112                                          const gchar    *dest_charset_str);
 113
 114 static gchar *conv_iconv_strdup_with_cd (const gchar    *inbuf,
 115                                          iconv_t         cd);
 116
 117 static CharSet conv_get_locale_charset                  (void);
 118 static CharSet conv_get_outgoing_charset                (void);
 119 static CharSet conv_guess_ja_encoding(const gchar *str);
 120 static gboolean conv_is_ja_locale                       (void);
 121
 122 static void conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 123 static void conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf);
 124 static void conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 125
 126 static void conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 127 static void conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 128 static void conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 129 static void conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
 130
 131 static void conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
 132 static void conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf);
 133
 134 static void conv_unreadable_8bit(gchar *str);
 135
 136 static void conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 137 static void conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 138 static void conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 139
 140 static void conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 141 static void conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
 142 static void conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf);
 143
 144 static gboolean strict_mode = FALSE;
 145
 146 void codeconv_set_strict(gboolean mode)
 147 {
 148         strict_mode = mode;
 149 }
 150
 151 static void conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 152 {
 153         const guchar *in = inbuf;
 154         guchar *out = outbuf;
 155         JISState state = JIS_ASCII;
 156
 157         while (*in != '\0') {
 158                 if (*in == ESC) {
 159                         in++;
 160                         if (*in == '$') {
 161                                 if (*(in + 1) == '@' || *(in + 1) == 'B') {
 162                                         state = JIS_KANJI;
 163                                         in += 2;
 164                                 } else if (*(in + 1) == '(' &&
 165                                            *(in + 2) == 'D') {
 166                                         state = JIS_AUXKANJI;
 167                                         in += 3;
 168                                 } else {
 169                                         /* unknown escape sequence */
 170                                         state = JIS_ASCII;
 171                                 }
 172                         } else if (*in == '(') {
 173                                 if (*(in + 1) == 'B' || *(in + 1) == 'J') {
 174                                         state = JIS_ASCII;
 175                                         in += 2;
 176                                 } else if (*(in + 1) == 'I') {
 177                                         state = JIS_HWKANA;
 178                                         in += 2;
 179                                 } else {
 180                                         /* unknown escape sequence */
 181                                         state = JIS_ASCII;
 182                                 }
 183                         } else {
 184                                 /* unknown escape sequence */
 185                                 state = JIS_ASCII;
 186                         }
 187                 } else if (*in == 0x0e) {
 188                         state = JIS_HWKANA;
 189                         in++;
 190                 } else if (*in == 0x0f) {
 191                         state = JIS_ASCII;
 192                         in++;
 193                 } else {
 194                         switch (state) {
 195                         case JIS_ASCII:
 196                                 *out++ = *in++;
 197                                 break;
 198                         case JIS_KANJI:
 199                                 *out++ = *in++ | 0x80;
 200                                 if (*in == '\0') break;
 201                                 *out++ = *in++ | 0x80;
 202                                 break;
 203                         case JIS_HWKANA:
 204                                 *out++ = 0x8e;
 205                                 *out++ = *in++ | 0x80;
 206                                 break;
 207                         case JIS_AUXKANJI:
 208                                 *out++ = 0x8f;
 209                                 *out++ = *in++ | 0x80;
 210                                 if (*in == '\0') break;
 211                                 *out++ = *in++ | 0x80;
 212                                 break;
 213                         }
 214                 }
 215         }
 216
 217         *out = '\0';
 218 }
 219
 220 #define JIS_HWDAKUTEN           0x5e
 221 #define JIS_HWHANDAKUTEN        0x5f
 222
 223 static gint conv_jis_hantozen(guchar *outbuf, guchar jis_code, guchar sound_sym)
 224 {
 225         static guint16 h2z_tbl[] = {
 226                 /* 0x20 - 0x2f */
 227                 0x0000, 0x2123, 0x2156, 0x2157, 0x2122, 0x2126, 0x2572, 0x2521,
 228                 0x2523, 0x2525, 0x2527, 0x2529, 0x2563, 0x2565, 0x2567, 0x2543,
 229                 /* 0x30 - 0x3f */
 230                 0x213c, 0x2522, 0x2524, 0x2526, 0x2528, 0x252a, 0x252b, 0x252d,
 231                 0x252f, 0x2531, 0x2533, 0x2535, 0x2537, 0x2539, 0x253b, 0x253d,
 232                 /* 0x40 - 0x4f */
 233                 0x253f, 0x2541, 0x2544, 0x2546, 0x2548, 0x254a, 0x254b, 0x254c,
 234                 0x254d, 0x254e, 0x254f, 0x2552, 0x2555, 0x2558, 0x255b, 0x255e,
 235                 /* 0x50 - 0x5f */
 236                 0x255f, 0x2560, 0x2561, 0x2562, 0x2564, 0x2566, 0x2568, 0x2569,
 237                 0x256a, 0x256b, 0x256c, 0x256d, 0x256f, 0x2573, 0x212b, 0x212c
 238         };
 239
 240         static guint16 dakuten_tbl[] = {
 241                 /* 0x30 - 0x3f */
 242                 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x252c, 0x252e,
 243                 0x2530, 0x2532, 0x2534, 0x2536, 0x2538, 0x253a, 0x253c, 0x253e,
 244                 /* 0x40 - 0x4f */
 245                 0x2540, 0x2542, 0x2545, 0x2547, 0x2549, 0x0000, 0x0000, 0x0000,
 246                 0x0000, 0x0000, 0x2550, 0x2553, 0x2556, 0x2559, 0x255c, 0x0000
 247         };
 248
 249         static guint16 handakuten_tbl[] = {
 250                 /* 0x4a - 0x4e */
 251                 0x2551, 0x2554, 0x2557, 0x255a, 0x255d
 252         };
 253
 254         guint16 out_code;
 255
 256         jis_code &= 0x7f;
 257         sound_sym &= 0x7f;
 258
 259         if (jis_code < 0x21 || jis_code > 0x5f)
 260                 return 0;
 261
 262         if (sound_sym == JIS_HWDAKUTEN &&
 263             jis_code >= 0x36 && jis_code <= 0x4e) {
 264                 out_code = dakuten_tbl[jis_code - 0x30];
 265                 if (out_code != 0) {
 266                         *outbuf = out_code >> 8;
 267                         *(outbuf + 1) = out_code & 0xff;
 268                         return 2;
 269                 }
 270         }
 271
 272         if (sound_sym == JIS_HWHANDAKUTEN &&
 273             jis_code >= 0x4a && jis_code <= 0x4e) {
 274                 out_code = handakuten_tbl[jis_code - 0x4a];
 275                 *outbuf = out_code >> 8;
 276                 *(outbuf + 1) = out_code & 0xff;
 277                 return 2;
 278         }
 279
 280         out_code = h2z_tbl[jis_code - 0x20];
 281         *outbuf = out_code >> 8;
 282         *(outbuf + 1) = out_code & 0xff;
 283         return 1;
 284 }
 285
 286 static void conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf)
 287 {
 288         const guchar *in = inbuf;
 289         guchar *out = outbuf;
 290         JISState state = JIS_ASCII;
 291
 292         while (*in != '\0') {
 293                 if (IS_ASCII(*in)) {
 294                         K_OUT();
 295                         *out++ = *in++;
 296                 } else if (iseuckanji(*in)) {
 297                         if (iseuckanji(*(in + 1))) {
 298                                 K_IN();
 299                                 *out++ = *in++ & 0x7f;
 300                                 *out++ = *in++ & 0x7f;
 301                         } else {
 302                                 K_OUT();
 303                                 *out++ = SUBST_CHAR;
 304                                 in++;
 305                                 if (*in != '\0' && !IS_ASCII(*in)) {
 306                                         *out++ = SUBST_CHAR;
 307                                         in++;
 308                                 }
 309                         }
 310                 } else if (iseuchwkana1(*in)) {
 311                         if (iseuchwkana2(*(in + 1))) {
 312                                 if (prefs_common.allow_jisx0201_kana) {
 313                                         HW_IN();
 314                                         in++;
 315                                         *out++ = *in++ & 0x7f;
 316                                 } else {
 317                                         guchar jis_ch[2];
 318                                         gint len;
 319
 320                                         if (iseuchwkana1(*(in + 2)) &&
 321                                             iseuchwkana2(*(in + 3)))
 322                                                 len = conv_jis_hantozen
 323                                                         (jis_ch,
 324                                                          *(in + 1), *(in + 3));
 325                                         else
 326                                                 len = conv_jis_hantozen
 327                                                         (jis_ch,
 328                                                          *(in + 1), '\0');
 329                                         if (len == 0)
 330                                                 in += 2;
 331                                         else {
 332                                                 K_IN();
 333                                                 in += len * 2;
 334                                                 *out++ = jis_ch[0];
 335                                                 *out++ = jis_ch[1];
 336                                         }
 337                                 }
 338                         } else {
 339                                 K_OUT();
 340                                 in++;
 341                                 if (*in != '\0' && !IS_ASCII(*in)) {
 342                                         *out++ = SUBST_CHAR;
 343                                         in++;
 344                                 }
 345                         }
 346                 } else if (iseucaux(*in)) {
 347                         in++;
 348                         if (iseuckanji(*in) && iseuckanji(*(in + 1))) {
 349                                 AUX_IN();
 350                                 *out++ = *in++ & 0x7f;
 351                                 *out++ = *in++ & 0x7f;
 352                         } else {
 353                                 K_OUT();
 354                                 if (*in != '\0' && !IS_ASCII(*in)) {
 355                                         *out++ = SUBST_CHAR;
 356                                         in++;
 357                                         if (*in != '\0' && !IS_ASCII(*in)) {
 358                                                 *out++ = SUBST_CHAR;
 359                                                 in++;
 360                                         }
 361                                 }
 362                         }
 363                 } else {
 364                         K_OUT();
 365                         *out++ = SUBST_CHAR;
 366                         in++;
 367                 }
 368         }
 369
 370         K_OUT();
 371         *out = '\0';
 372 }
 373
 374 static void conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 375 {
 376         const guchar *in = inbuf;
 377         guchar *out = outbuf;
 378
 379         while (*in != '\0') {
 380                 if (IS_ASCII(*in)) {
 381                         *out++ = *in++;
 382                 } else if (issjiskanji1(*in)) {
 383                         if (issjiskanji2(*(in + 1))) {
 384                                 guchar out1 = *in;
 385                                 guchar out2 = *(in + 1);
 386                                 guchar row;
 387
 388                                 row = out1 < 0xa0 ? 0x70 : 0xb0;
 389                                 if (out2 < 0x9f) {
 390                                         out1 = (out1 - row) * 2 - 1;
 391                                         out2 -= out2 > 0x7f ? 0x20 : 0x1f;
 392                                 } else {
 393                                         out1 = (out1 - row) * 2;
 394                                         out2 -= 0x7e;
 395                                 }
 396
 397                                 *out++ = out1 | 0x80;
 398                                 *out++ = out2 | 0x80;
 399                                 in += 2;
 400                         } else {
 401                                 *out++ = SUBST_CHAR;
 402                                 in++;
 403                                 if (*in != '\0' && !IS_ASCII(*in)) {
 404                                         *out++ = SUBST_CHAR;
 405                                         in++;
 406                                 }
 407                         }
 408                 } else if (issjishwkana(*in)) {
 409                         *out++ = 0x8e;
 410                         *out++ = *in++;
 411                 } else {
 412                         *out++ = SUBST_CHAR;
 413                         in++;
 414                 }
 415         }
 416
 417         *out = '\0';
 418 }
 419
 420 static void conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 421 {
 422         gchar *eucstr;
 423
 424         Xalloca(eucstr, outlen, return);
 425
 426         conv_jistoeuc(eucstr, outlen, inbuf);
 427         conv_euctoutf8(outbuf, outlen, eucstr);
 428 }
 429
 430 static void conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 431 {
 432         gchar *tmpstr;
 433
 434         tmpstr = conv_iconv_strdup(inbuf, CS_SHIFT_JIS, CS_UTF_8);
 435         if (tmpstr) {
 436                 strncpy2(outbuf, tmpstr, outlen);
 437                 g_free(tmpstr);
 438         } else
 439                 strncpy2(outbuf, inbuf, outlen);
 440 }
 441
 442 static void conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 443 {
 444         static iconv_t cd = (iconv_t)-1;
 445         static gboolean iconv_ok = TRUE;
 446         gchar *tmpstr;
 447
 448         if (cd == (iconv_t)-1) {
 449                 if (!iconv_ok) {
 450                         strncpy2(outbuf, inbuf, outlen);
 451                         return;
 452                 }
 453                 cd = iconv_open(CS_UTF_8, CS_EUC_JP_MS);
 454                 if (cd == (iconv_t)-1) {
 455                         cd = iconv_open(CS_UTF_8, CS_EUC_JP);
 456                         if (cd == (iconv_t)-1) {
 457                                 g_warning("conv_euctoutf8(): %s\n",
 458                                           g_strerror(errno));
 459                                 iconv_ok = FALSE;
 460                                 strncpy2(outbuf, inbuf, outlen);
 461                                 return;
 462                         }
 463                 }
 464         }
 465
 466         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
 467         if (tmpstr) {
 468                 strncpy2(outbuf, tmpstr, outlen);
 469                 g_free(tmpstr);
 470         } else
 471                 strncpy2(outbuf, inbuf, outlen);
 472 }
 473
 474 static void conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
 475 {
 476         switch (conv_guess_ja_encoding(inbuf)) {
 477         case C_ISO_2022_JP:
 478                 conv_jistoutf8(outbuf, outlen, inbuf);
 479                 break;
 480         case C_SHIFT_JIS:
 481                 conv_sjistoutf8(outbuf, outlen, inbuf);
 482                 break;
 483         case C_EUC_JP:
 484                 conv_euctoutf8(outbuf, outlen, inbuf);
 485                 break;
 486         default:
 487                 strncpy2(outbuf, inbuf, outlen);
 488                 break;
 489         }
 490 }
 491
 492 static void conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
 493 {
 494         static iconv_t cd = (iconv_t)-1;
 495         static gboolean iconv_ok = TRUE;
 496         gchar *tmpstr;
 497
 498         if (cd == (iconv_t)-1) {
 499                 if (!iconv_ok) {
 500                         strncpy2(outbuf, inbuf, outlen);
 501                         return;
 502                 }
 503                 cd = iconv_open(CS_EUC_JP_MS, CS_UTF_8);
 504                 if (cd == (iconv_t)-1) {
 505                         cd = iconv_open(CS_EUC_JP, CS_UTF_8);
 506                         if (cd == (iconv_t)-1) {
 507                                 g_warning("conv_utf8toeuc(): %s\n",
 508                                           g_strerror(errno));
 509                                 iconv_ok = FALSE;
 510                                 strncpy2(outbuf, inbuf, outlen);
 511                                 return;
 512                         }
 513                 }
 514         }
 515
 516         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
 517         if (tmpstr) {
 518                 strncpy2(outbuf, tmpstr, outlen);
 519                 g_free(tmpstr);
 520         } else
 521                 strncpy2(outbuf, inbuf, outlen);
 522 }
 523
 524 static void conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf)
 525 {
 526         gchar *eucstr;
 527
 528         Xalloca(eucstr, outlen, return);
 529
 530         conv_utf8toeuc(eucstr, outlen, inbuf);
 531         conv_euctojis(outbuf, outlen, eucstr);
 532 }
 533
 534 static void conv_unreadable_8bit(gchar *str)
 535 {
 536         register guchar *p = str;
 537
 538         while (*p != '\0') {
 539                 /* convert CR+LF -> LF */
 540                 if (*p == '\r' && *(p + 1) == '\n')
 541                         memmove(p, p + 1, strlen(p));
 542                 else if (!IS_ASCII(*p)) *p = SUBST_CHAR;
 543                 p++;
 544         }
 545 }
 546
 547 static CharSet conv_guess_ja_encoding(const gchar *str)
 548 {
 549         const guchar *p = str;
 550         CharSet guessed = C_US_ASCII;
 551
 552         while (*p != '\0') {
 553                 if (*p == ESC && (*(p + 1) == '$' || *(p + 1) == '(')) {
 554                         if (guessed == C_US_ASCII)
 555                                 return C_ISO_2022_JP;
 556                         p += 2;
 557                 } else if (IS_ASCII(*p)) {
 558                         p++;
 559                 } else if (iseuckanji(*p) && iseuckanji(*(p + 1))) {
 560                         if (*p >= 0xfd && *p <= 0xfe)
 561                                 return C_EUC_JP;
 562                         else if (guessed == C_SHIFT_JIS) {
 563                                 if ((issjiskanji1(*p) &&
 564                                      issjiskanji2(*(p + 1))) ||
 565                                     issjishwkana(*p))
 566                                         guessed = C_SHIFT_JIS;
 567                                 else
 568                                         guessed = C_EUC_JP;
 569                         } else
 570                                 guessed = C_EUC_JP;
 571                         p += 2;
 572                 } else if (issjiskanji1(*p) && issjiskanji2(*(p + 1))) {
 573                         if (iseuchwkana1(*p) && iseuchwkana2(*(p + 1)))
 574                                 guessed = C_SHIFT_JIS;
 575                         else
 576                                 return C_SHIFT_JIS;
 577                         p += 2;
 578                 } else if (issjishwkana(*p)) {
 579                         guessed = C_SHIFT_JIS;
 580                         p++;
 581                 } else {
 582                         p++;
 583                 }
 584         }
 585
 586         return guessed;
 587 }
 588
 589 static void conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 590 {
 591         conv_jistoutf8(outbuf, outlen, inbuf);
 592 }
 593
 594 static void conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 595 {
 596         conv_sjistoutf8(outbuf, outlen, inbuf);
 597 }
 598
 599 static void conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 600 {
 601         conv_euctoutf8(outbuf, outlen, inbuf);
 602 }
 603
 604 void conv_utf8todisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 605 {
 606         if (g_utf8_validate(inbuf, -1, NULL) == TRUE)
 607                 strncpy2(outbuf, inbuf, outlen);
 608         else
 609                 conv_ustodisp(outbuf, outlen, inbuf);
 610 }
 611
 612 static void conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 613 {
 614         conv_anytoutf8(outbuf, outlen, inbuf);
 615         if (g_utf8_validate(outbuf, -1, NULL) != TRUE)
 616                 conv_unreadable_8bit(outbuf);
 617 }
 618
 619 static void conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 620 {
 621         strncpy2(outbuf, inbuf, outlen);
 622         conv_unreadable_8bit(outbuf);
 623 }
 624
 625 void conv_localetodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
 626 {
 627         gchar *tmpstr;
 628
 629         codeconv_set_strict(TRUE);
 630         tmpstr = conv_iconv_strdup(inbuf, conv_get_locale_charset_str(),
 631                                    CS_INTERNAL);
 632         codeconv_set_strict(FALSE);
 633         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
 634                 strncpy2(outbuf, tmpstr, outlen);
 635                 g_free(tmpstr);
 636                 return;
 637         } else if (tmpstr && !g_utf8_validate(tmpstr, -1, NULL)) {
 638                 g_free(tmpstr);
 639                 codeconv_set_strict(TRUE);
 640                 tmpstr = conv_iconv_strdup(inbuf,
 641                                 conv_get_locale_charset_str_no_utf8(),
 642                                 CS_INTERNAL);
 643                 codeconv_set_strict(FALSE);
 644         }
 645         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
 646                 strncpy2(outbuf, tmpstr, outlen);
 647                 g_free(tmpstr);
 648                 return;
 649         } else {
 650                 g_free(tmpstr);
 651                 conv_utf8todisp(outbuf, outlen, inbuf);
 652         }
 653 }
 654
 655 static void conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf)
 656 {
 657         strncpy2(outbuf, inbuf, outlen);
 658 }
 659
 660 static const gchar *
 661 conv_get_fallback_for_private_encoding(const gchar *encoding)
 662 {
 663         if (encoding && (encoding[0] == 'X' || encoding[0] == 'x') &&
 664             encoding[1] == '-') {
 665                 if (!g_ascii_strcasecmp(encoding, CS_X_GBK))
 666                         return CS_GBK;
 667         }
 668
 669         return encoding;
 670 }
 671
 672 CodeConverter *conv_code_converter_new(const gchar *src_charset)
 673 {
 674         CodeConverter *conv;
 675
 676         src_charset = conv_get_fallback_for_private_encoding(src_charset);
 677
 678         conv = g_new0(CodeConverter, 1);
 679         conv->code_conv_func = conv_get_code_conv_func(src_charset, NULL);
 680         conv->charset_str = g_strdup(src_charset);
 681         conv->charset = conv_get_charset_from_str(src_charset);
 682
 683         return conv;
 684 }
 685
 686 void conv_code_converter_destroy(CodeConverter *conv)
 687 {
 688         g_free(conv->charset_str);
 689         g_free(conv);
 690 }
 691
 692 gint conv_convert(CodeConverter *conv, gchar *outbuf, gint outlen,
 693                   const gchar *inbuf)
 694 {
 695         if (conv->code_conv_func != conv_noconv)
 696                 conv->code_conv_func(outbuf, outlen, inbuf);
 697         else {
 698                 gchar *str;
 699
 700                 str = conv_iconv_strdup(inbuf, conv->charset_str, NULL);
 701                 if (!str)
 702                         return -1;
 703                 else {
 704                         strncpy2(outbuf, str, outlen);
 705                         g_free(str);
 706                 }
 707         }
 708
 709         return 0;
 710 }
 711
 712 gchar *conv_codeset_strdup(const gchar *inbuf,
 713                            const gchar *src_code, const gchar *dest_code)
 714 {
 715         gchar *buf;
 716         size_t len;
 717         CodeConvFunc conv_func;
 718
 719         src_code = conv_get_fallback_for_private_encoding(src_code);
 720         conv_func = conv_get_code_conv_func(src_code, dest_code);
 721         if (conv_func != conv_noconv) {
 722                 len = (strlen(inbuf) + 1) * 3;
 723                 buf = g_malloc(len);
 724                 if (!buf) return NULL;
 725
 726                 conv_func(buf, len, inbuf);
 727                 return g_realloc(buf, strlen(buf) + 1);
 728         }
 729
 730         return conv_iconv_strdup(inbuf, src_code, dest_code);
 731 }
 732
 733 static CodeConvFunc conv_get_code_conv_func(const gchar *src_charset_str,
 734                                      const gchar *dest_charset_str)
 735 {
 736         CodeConvFunc code_conv = conv_noconv;
 737         CharSet src_charset;
 738         CharSet dest_charset;
 739
 740         if (!src_charset_str)
 741                 src_charset = conv_get_locale_charset();
 742         else
 743                 src_charset = conv_get_charset_from_str(src_charset_str);
 744
 745         /* auto detection mode */
 746         if (!src_charset_str && !dest_charset_str) {
 747                 if (conv_is_ja_locale())
 748                         return conv_anytodisp;
 749                 else
 750                         return conv_noconv;
 751         }
 752
 753         dest_charset = conv_get_charset_from_str(dest_charset_str);
 754
 755         if (dest_charset == C_US_ASCII)
 756                 return conv_ustodisp;
 757
 758         switch (src_charset) {
 759         case C_US_ASCII:
 760         case C_ISO_8859_1:
 761         case C_ISO_8859_2:
 762         case C_ISO_8859_3:
 763         case C_ISO_8859_4:
 764         case C_ISO_8859_5:
 765         case C_ISO_8859_6:
 766         case C_ISO_8859_7:
 767         case C_ISO_8859_8:
 768         case C_ISO_8859_9:
 769         case C_ISO_8859_10:
 770         case C_ISO_8859_11:
 771         case C_ISO_8859_13:
 772         case C_ISO_8859_14:
 773         case C_ISO_8859_15:
 774                 break;
 775         case C_ISO_2022_JP:
 776         case C_ISO_2022_JP_2:
 777         case C_ISO_2022_JP_3:
 778                 if (dest_charset == C_AUTO)
 779                         code_conv = conv_jistodisp;
 780                 else if (dest_charset == C_EUC_JP)
 781                         code_conv = conv_jistoeuc;
 782                 else if (dest_charset == C_UTF_8)
 783                         code_conv = conv_jistoutf8;
 784                 break;
 785         case C_SHIFT_JIS:
 786                 if (dest_charset == C_AUTO)
 787                         code_conv = conv_sjistodisp;
 788                 else if (dest_charset == C_EUC_JP)
 789                         code_conv = conv_sjistoeuc;
 790                 else if (dest_charset == C_UTF_8)
 791                         code_conv = conv_sjistoutf8;
 792                 break;
 793         case C_EUC_JP:
 794                 if (dest_charset == C_AUTO)
 795                         code_conv = conv_euctodisp;
 796                 else if (dest_charset == C_ISO_2022_JP   ||
 797                          dest_charset == C_ISO_2022_JP_2 ||
 798                          dest_charset == C_ISO_2022_JP_3)
 799                         code_conv = conv_euctojis;
 800                 else if (dest_charset == C_UTF_8)
 801                         code_conv = conv_euctoutf8;
 802                 break;
 803         case C_UTF_8:
 804                 if (dest_charset == C_EUC_JP)
 805                         code_conv = conv_utf8toeuc;
 806                 else if (dest_charset == C_ISO_2022_JP   ||
 807                          dest_charset == C_ISO_2022_JP_2 ||
 808                          dest_charset == C_ISO_2022_JP_3)
 809                         code_conv = conv_utf8tojis;
 810                 break;
 811         default:
 812                 break;
 813         }
 814
 815         return code_conv;
 816 }
 817
 818 gchar *conv_iconv_strdup(const gchar *inbuf,
 819                          const gchar *src_code, const gchar *dest_code)
 820 {
 821         iconv_t cd;
 822         gchar *outbuf;
 823
 824         if (!src_code && !dest_code &&
 825             g_utf8_validate(inbuf, -1, NULL))
 826                 return g_strdup(inbuf);
 827
 828         if (!src_code)
 829                 src_code = conv_get_outgoing_charset_str();
 830         if (!dest_code)
 831                 dest_code = CS_INTERNAL;
 832
 833         /* don't convert if src and dest codeset are identical */
 834         if (!strcasecmp(src_code, dest_code))
 835                 return g_strdup(inbuf);
 836
 837         /* don't convert if dest codeset is US-ASCII */
 838         if (!strcasecmp(src_code, CS_US_ASCII))
 839                 return g_strdup(inbuf);
 840
 841         /* don't convert if dest codeset is US-ASCII */
 842         if (!strcasecmp(dest_code, CS_US_ASCII))
 843                 return g_strdup(inbuf);
 844
 845         cd = iconv_open(dest_code, src_code);
 846         if (cd == (iconv_t)-1)
 847                 return NULL;
 848
 849         outbuf = conv_iconv_strdup_with_cd(inbuf, cd);
 850
 851         iconv_close(cd);
 852
 853         return outbuf;
 854 }
 855
 856 gchar *conv_iconv_strdup_with_cd(const gchar *inbuf, iconv_t cd)
 857 {
 858         const gchar *inbuf_p;
 859         gchar *outbuf;
 860         gchar *outbuf_p;
 861         size_t in_size;
 862         size_t in_left;
 863         size_t out_size;
 864         size_t out_left;
 865         size_t n_conv;
 866         size_t len;
 867
 868         inbuf_p = inbuf;
 869         in_size = strlen(inbuf);
 870         in_left = in_size;
 871         out_size = (in_size + 1) * 2;
 872         outbuf = g_malloc(out_size);
 873         outbuf_p = outbuf;
 874         out_left = out_size;
 875
 876 #define EXPAND_BUF()                            \
 877 {                                               \
 878         len = outbuf_p - outbuf;                \
 879         out_size *= 2;                          \
 880         outbuf = g_realloc(outbuf, out_size);   \
 881         outbuf_p = outbuf + len;                \
 882         out_left = out_size - len;              \
 883 }
 884
 885         while ((n_conv = iconv(cd, (ICONV_CONST gchar **)&inbuf_p, &in_left,
 886                                &outbuf_p, &out_left)) == (size_t)-1) {
 887                 if (EILSEQ == errno) {
 888                         if (strict_mode) {
 889                                 g_free(outbuf);
 890                                 return NULL;
 891                         }
 892                         //g_print("iconv(): at %d: %s\n", in_size - in_left, g_strerror(errno));
 893                         inbuf_p++;
 894                         in_left--;
 895                         if (out_left == 0) {
 896                                 EXPAND_BUF();
 897                         }
 898                         *outbuf_p++ = SUBST_CHAR;
 899                         out_left--;
 900                 } else if (EINVAL == errno) {
 901                         break;
 902                 } else if (E2BIG == errno) {
 903                         EXPAND_BUF();
 904                 } else {
 905                         g_warning("conv_iconv_strdup(): %s\n",
 906                                   g_strerror(errno));
 907                         break;
 908                 }
 909         }
 910
 911         while ((n_conv = iconv(cd, NULL, NULL, &outbuf_p, &out_left)) ==
 912                (size_t)-1) {
 913                 if (E2BIG == errno) {
 914                         EXPAND_BUF();
 915                 } else {
 916                         g_warning("conv_iconv_strdup(): %s\n",
 917                                   g_strerror(errno));
 918                         break;
 919                 }
 920         }
 921
 922 #undef EXPAND_BUF
 923
 924         len = outbuf_p - outbuf;
 925         outbuf = g_realloc(outbuf, len + 1);
 926         outbuf[len] = '\0';
 927
 928         return outbuf;
 929 }
 930
 931 static const struct {
 932         CharSet charset;
 933         gchar *const name;
 934 } charsets[] = {
 935         {C_US_ASCII,            CS_US_ASCII},
 936         {C_US_ASCII,            CS_ANSI_X3_4_1968},
 937         {C_UTF_8,               CS_UTF_8},
 938         {C_UTF_7,               CS_UTF_7},
 939         {C_ISO_8859_1,          CS_ISO_8859_1},
 940         {C_ISO_8859_2,          CS_ISO_8859_2},
 941         {C_ISO_8859_3,          CS_ISO_8859_3},
 942         {C_ISO_8859_4,          CS_ISO_8859_4},
 943         {C_ISO_8859_5,          CS_ISO_8859_5},
 944         {C_ISO_8859_6,          CS_ISO_8859_6},
 945         {C_ISO_8859_7,          CS_ISO_8859_7},
 946         {C_ISO_8859_8,          CS_ISO_8859_8},
 947         {C_ISO_8859_9,          CS_ISO_8859_9},
 948         {C_ISO_8859_10,         CS_ISO_8859_10},
 949         {C_ISO_8859_11,         CS_ISO_8859_11},
 950         {C_ISO_8859_13,         CS_ISO_8859_13},
 951         {C_ISO_8859_14,         CS_ISO_8859_14},
 952         {C_ISO_8859_15,         CS_ISO_8859_15},
 953         {C_BALTIC,              CS_BALTIC},
 954         {C_CP1250,              CS_CP1250},
 955         {C_CP1251,              CS_CP1251},
 956         {C_CP1252,              CS_CP1252},
 957         {C_CP1253,              CS_CP1253},
 958         {C_CP1254,              CS_CP1254},
 959         {C_CP1255,              CS_CP1255},
 960         {C_CP1256,              CS_CP1256},
 961         {C_CP1257,              CS_CP1257},
 962         {C_CP1258,              CS_CP1258},
 963         {C_WINDOWS_1250,        CS_WINDOWS_1250},
 964         {C_WINDOWS_1251,        CS_WINDOWS_1251},
 965         {C_WINDOWS_1252,        CS_WINDOWS_1252},
 966         {C_WINDOWS_1253,        CS_WINDOWS_1253},
 967         {C_WINDOWS_1254,        CS_WINDOWS_1254},
 968         {C_WINDOWS_1255,        CS_WINDOWS_1255},
 969         {C_WINDOWS_1256,        CS_WINDOWS_1256},
 970         {C_WINDOWS_1257,        CS_WINDOWS_1257},
 971         {C_WINDOWS_1258,        CS_WINDOWS_1258},
 972         {C_KOI8_R,              CS_KOI8_R},
 973         {C_KOI8_T,              CS_KOI8_T},
 974         {C_KOI8_U,              CS_KOI8_U},
 975         {C_ISO_2022_JP,         CS_ISO_2022_JP},
 976         {C_ISO_2022_JP_2,       CS_ISO_2022_JP_2},
 977         {C_ISO_2022_JP_3,       CS_ISO_2022_JP_3},
 978         {C_EUC_JP,              CS_EUC_JP},
 979         {C_EUC_JP,              CS_EUCJP},
 980         {C_EUC_JP_MS,           CS_EUC_JP_MS},
 981         {C_SHIFT_JIS,           CS_SHIFT_JIS},
 982         {C_SHIFT_JIS,           CS_SHIFT__JIS},
 983         {C_SHIFT_JIS,           CS_SJIS},
 984         {C_ISO_2022_KR,         CS_ISO_2022_KR},
 985         {C_EUC_KR,              CS_EUC_KR},
 986         {C_ISO_2022_CN,         CS_ISO_2022_CN},
 987         {C_EUC_CN,              CS_EUC_CN},
 988         {C_GB2312,              CS_GB2312},
 989         {C_GBK,                 CS_GBK},
 990         {C_EUC_TW,              CS_EUC_TW},
 991         {C_BIG5,                CS_BIG5},
 992         {C_BIG5_HKSCS,          CS_BIG5_HKSCS},
 993         {C_TIS_620,             CS_TIS_620},
 994         {C_WINDOWS_874,         CS_WINDOWS_874},
 995         {C_GEORGIAN_PS,         CS_GEORGIAN_PS},
 996         {C_TCVN5712_1,          CS_TCVN5712_1},
 997 };
 998
 999 static const struct {
1000         gchar *const locale;
1001         CharSet charset;
1002         CharSet out_charset;
1003 } locale_table[] = {
1004         {"ja_JP.eucJP"  , C_EUC_JP      , C_ISO_2022_JP},
1005         {"ja_JP.EUC-JP" , C_EUC_JP      , C_ISO_2022_JP},
1006         {"ja_JP.EUC"    , C_EUC_JP      , C_ISO_2022_JP},
1007         {"ja_JP.ujis"   , C_EUC_JP      , C_ISO_2022_JP},
1008         {"ja_JP.SJIS"   , C_SHIFT_JIS   , C_ISO_2022_JP},
1009         {"ja_JP.JIS"    , C_ISO_2022_JP , C_ISO_2022_JP},
1010 #ifdef G_OS_WIN32
1011         {"ja_JP"        , C_SHIFT_JIS   , C_ISO_2022_JP},
1012 #else
1013         {"ja_JP"        , C_EUC_JP      , C_ISO_2022_JP},
1014 #endif
1015         {"ko_KR.EUC-KR" , C_EUC_KR      , C_EUC_KR},
1016         {"ko_KR"        , C_EUC_KR      , C_EUC_KR},
1017         {"zh_CN.GB2312" , C_GB2312      , C_GB2312},
1018         {"zh_CN.GBK"    , C_GBK         , C_GBK},
1019         {"zh_CN"        , C_GB2312      , C_GB2312},
1020         {"zh_HK"        , C_BIG5_HKSCS  , C_BIG5_HKSCS},
1021         {"zh_TW.eucTW"  , C_EUC_TW      , C_BIG5},
1022         {"zh_TW.EUC-TW" , C_EUC_TW      , C_BIG5},
1023         {"zh_TW.Big5"   , C_BIG5        , C_BIG5},
1024         {"zh_TW"        , C_BIG5        , C_BIG5},
1025
1026         {"ru_RU.KOI8-R" , C_KOI8_R      , C_KOI8_R},
1027         {"ru_RU.KOI8R"  , C_KOI8_R      , C_KOI8_R},
1028         {"ru_RU.CP1251" , C_WINDOWS_1251, C_KOI8_R},
1029         {"ru_RU"        , C_ISO_8859_5  , C_KOI8_R},
1030         {"tg_TJ"        , C_KOI8_T      , C_KOI8_T},
1031         {"ru_UA"        , C_KOI8_U      , C_KOI8_U},
1032         {"uk_UA.CP1251" , C_WINDOWS_1251, C_KOI8_U},
1033         {"uk_UA"        , C_KOI8_U      , C_KOI8_U},
1034
1035         {"be_BY"        , C_WINDOWS_1251, C_WINDOWS_1251},
1036         {"bg_BG"        , C_WINDOWS_1251, C_WINDOWS_1251},
1037
1038         {"yi_US"        , C_WINDOWS_1255, C_WINDOWS_1255},
1039
1040         {"af_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1041         {"br_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1042         {"ca_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1043         {"da_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1044         {"de_AT"        , C_ISO_8859_1  , C_ISO_8859_1},
1045         {"de_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1046         {"de_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1047         {"de_DE"        , C_ISO_8859_1  , C_ISO_8859_1},
1048         {"de_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1049         {"en_AU"        , C_ISO_8859_1  , C_ISO_8859_1},
1050         {"en_BW"        , C_ISO_8859_1  , C_ISO_8859_1},
1051         {"en_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1052         {"en_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1053         {"en_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1054         {"en_HK"        , C_ISO_8859_1  , C_ISO_8859_1},
1055         {"en_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1056         {"en_NZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1057         {"en_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1058         {"en_SG"        , C_ISO_8859_1  , C_ISO_8859_1},
1059         {"en_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1060         {"en_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1061         {"en_ZW"        , C_ISO_8859_1  , C_ISO_8859_1},
1062         {"es_AR"        , C_ISO_8859_1  , C_ISO_8859_1},
1063         {"es_BO"        , C_ISO_8859_1  , C_ISO_8859_1},
1064         {"es_CL"        , C_ISO_8859_1  , C_ISO_8859_1},
1065         {"es_CO"        , C_ISO_8859_1  , C_ISO_8859_1},
1066         {"es_CR"        , C_ISO_8859_1  , C_ISO_8859_1},
1067         {"es_DO"        , C_ISO_8859_1  , C_ISO_8859_1},
1068         {"es_EC"        , C_ISO_8859_1  , C_ISO_8859_1},
1069         {"es_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1070         {"es_GT"        , C_ISO_8859_1  , C_ISO_8859_1},
1071         {"es_HN"        , C_ISO_8859_1  , C_ISO_8859_1},
1072         {"es_MX"        , C_ISO_8859_1  , C_ISO_8859_1},
1073         {"es_NI"        , C_ISO_8859_1  , C_ISO_8859_1},
1074         {"es_PA"        , C_ISO_8859_1  , C_ISO_8859_1},
1075         {"es_PE"        , C_ISO_8859_1  , C_ISO_8859_1},
1076         {"es_PR"        , C_ISO_8859_1  , C_ISO_8859_1},
1077         {"es_PY"        , C_ISO_8859_1  , C_ISO_8859_1},
1078         {"es_SV"        , C_ISO_8859_1  , C_ISO_8859_1},
1079         {"es_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1080         {"es_UY"        , C_ISO_8859_1  , C_ISO_8859_1},
1081         {"es_VE"        , C_ISO_8859_1  , C_ISO_8859_1},
1082         {"et_EE"        , C_ISO_8859_1  , C_ISO_8859_1},
1083         {"eu_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1084         {"fi_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1085         {"fo_FO"        , C_ISO_8859_1  , C_ISO_8859_1},
1086         {"fr_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1087         {"fr_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1088         {"fr_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1089         {"fr_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1090         {"fr_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1091         {"ga_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1092         {"gl_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1093         {"gv_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1094         {"id_ID"        , C_ISO_8859_1  , C_ISO_8859_1},
1095         {"is_IS"        , C_ISO_8859_1  , C_ISO_8859_1},
1096         {"it_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1097         {"it_IT"        , C_ISO_8859_1  , C_ISO_8859_1},
1098         {"kl_GL"        , C_ISO_8859_1  , C_ISO_8859_1},
1099         {"kw_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1100         {"ms_MY"        , C_ISO_8859_1  , C_ISO_8859_1},
1101         {"nl_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1102         {"nl_NL"        , C_ISO_8859_1  , C_ISO_8859_1},
1103         {"nn_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1104         {"no_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1105         {"oc_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1106         {"pt_BR"        , C_ISO_8859_1  , C_ISO_8859_1},
1107         {"pt_PT"        , C_ISO_8859_1  , C_ISO_8859_1},
1108         {"sq_AL"        , C_ISO_8859_1  , C_ISO_8859_1},
1109         {"sv_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1110         {"sv_SE"        , C_ISO_8859_1  , C_ISO_8859_1},
1111         {"tl_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1112         {"uz_UZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1113         {"wa_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1114
1115         {"bs_BA"        , C_ISO_8859_2  , C_ISO_8859_2},
1116         {"cs_CZ"        , C_ISO_8859_2  , C_ISO_8859_2},
1117         {"hr_HR"        , C_ISO_8859_2  , C_ISO_8859_2},
1118         {"hu_HU"        , C_ISO_8859_2  , C_ISO_8859_2},
1119         {"pl_PL"        , C_ISO_8859_2  , C_ISO_8859_2},
1120         {"ro_RO"        , C_ISO_8859_2  , C_ISO_8859_2},
1121         {"sk_SK"        , C_ISO_8859_2  , C_ISO_8859_2},
1122         {"sl_SI"        , C_ISO_8859_2  , C_ISO_8859_2},
1123
1124         {"sr_YU@cyrillic"       , C_ISO_8859_5  , C_ISO_8859_5},
1125         {"sr_YU"                , C_ISO_8859_2  , C_ISO_8859_2},
1126
1127         {"mt_MT"                , C_ISO_8859_3  , C_ISO_8859_3},
1128
1129         {"lt_LT.iso88594"       , C_ISO_8859_4  , C_ISO_8859_4},
1130         {"lt_LT.ISO8859-4"      , C_ISO_8859_4  , C_ISO_8859_4},
1131         {"lt_LT.ISO_8859-4"     , C_ISO_8859_4  , C_ISO_8859_4},
1132         {"lt_LT"                , C_ISO_8859_13 , C_ISO_8859_13},
1133
1134         {"mk_MK"        , C_ISO_8859_5  , C_ISO_8859_5},
1135
1136         {"ar_AE"        , C_ISO_8859_6  , C_ISO_8859_6},
1137         {"ar_BH"        , C_ISO_8859_6  , C_ISO_8859_6},
1138         {"ar_DZ"        , C_ISO_8859_6  , C_ISO_8859_6},
1139         {"ar_EG"        , C_ISO_8859_6  , C_ISO_8859_6},
1140         {"ar_IQ"        , C_ISO_8859_6  , C_ISO_8859_6},
1141         {"ar_JO"        , C_ISO_8859_6  , C_ISO_8859_6},
1142         {"ar_KW"        , C_ISO_8859_6  , C_ISO_8859_6},
1143         {"ar_LB"        , C_ISO_8859_6  , C_ISO_8859_6},
1144         {"ar_LY"        , C_ISO_8859_6  , C_ISO_8859_6},
1145         {"ar_MA"        , C_ISO_8859_6  , C_ISO_8859_6},
1146         {"ar_OM"        , C_ISO_8859_6  , C_ISO_8859_6},
1147         {"ar_QA"        , C_ISO_8859_6  , C_ISO_8859_6},
1148         {"ar_SA"        , C_ISO_8859_6  , C_ISO_8859_6},
1149         {"ar_SD"        , C_ISO_8859_6  , C_ISO_8859_6},
1150         {"ar_SY"        , C_ISO_8859_6  , C_ISO_8859_6},
1151         {"ar_TN"        , C_ISO_8859_6  , C_ISO_8859_6},
1152         {"ar_YE"        , C_ISO_8859_6  , C_ISO_8859_6},
1153
1154         {"el_GR"        , C_ISO_8859_7  , C_ISO_8859_7},
1155         {"he_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1156         {"iw_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1157         {"tr_TR"        , C_ISO_8859_9  , C_ISO_8859_9},
1158
1159         {"lv_LV"        , C_ISO_8859_13 , C_ISO_8859_13},
1160         {"mi_NZ"        , C_ISO_8859_13 , C_ISO_8859_13},
1161
1162         {"cy_GB"        , C_ISO_8859_14 , C_ISO_8859_14},
1163
1164         {"ar_IN"        , C_UTF_8       , C_UTF_8},
1165         {"en_IN"        , C_UTF_8       , C_UTF_8},
1166         {"se_NO"        , C_UTF_8       , C_UTF_8},
1167         {"ta_IN"        , C_UTF_8       , C_UTF_8},
1168         {"te_IN"        , C_UTF_8       , C_UTF_8},
1169         {"ur_PK"        , C_UTF_8       , C_UTF_8},
1170
1171         {"th_TH"        , C_TIS_620     , C_TIS_620},
1172         /* {"th_TH"     , C_WINDOWS_874}, */
1173         /* {"th_TH"     , C_ISO_8859_11}, */
1174
1175         {"ka_GE"        , C_GEORGIAN_PS , C_GEORGIAN_PS},
1176         {"vi_VN.TCVN"   , C_TCVN5712_1  , C_TCVN5712_1},
1177
1178         {"C"                    , C_US_ASCII    , C_US_ASCII},
1179         {"POSIX"                , C_US_ASCII    , C_US_ASCII},
1180         {"ANSI_X3.4-1968"       , C_US_ASCII    , C_US_ASCII},
1181 };
1182
1183 static GHashTable *conv_get_charset_to_str_table(void)
1184 {
1185         static GHashTable *table;
1186         gint i;
1187
1188         if (table)
1189                 return table;
1190
1191         table = g_hash_table_new(NULL, g_direct_equal);
1192
1193         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1194                 if (g_hash_table_lookup(table, GUINT_TO_POINTER(charsets[i].charset))
1195                     == NULL) {
1196                         g_hash_table_insert
1197                                 (table, GUINT_TO_POINTER(charsets[i].charset),
1198                                  charsets[i].name);
1199                 }
1200         }
1201
1202         return table;
1203 }
1204
1205 static GHashTable *conv_get_charset_from_str_table(void)
1206 {
1207         static GHashTable *table;
1208         gint i;
1209
1210         if (table)
1211                 return table;
1212
1213         table = g_hash_table_new(str_case_hash, str_case_equal);
1214
1215         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1216                 g_hash_table_insert(table, charsets[i].name,
1217                                     GUINT_TO_POINTER(charsets[i].charset));
1218         }
1219
1220         return table;
1221 }
1222
1223 const gchar *conv_get_charset_str(CharSet charset)
1224 {
1225         GHashTable *table;
1226
1227         table = conv_get_charset_to_str_table();
1228         return g_hash_table_lookup(table, GUINT_TO_POINTER(charset));
1229 }
1230
1231 CharSet conv_get_charset_from_str(const gchar *charset)
1232 {
1233         GHashTable *table;
1234
1235         if (!charset) return C_AUTO;
1236
1237         table = conv_get_charset_from_str_table();
1238         return GPOINTER_TO_UINT(g_hash_table_lookup(table, charset));
1239 }
1240
1241 static CharSet conv_get_locale_charset(void)
1242 {
1243         static CharSet cur_charset = -1;
1244         const gchar *cur_locale;
1245         const gchar *p;
1246         gint i;
1247
1248         if (cur_charset != -1)
1249                 return cur_charset;
1250
1251         cur_locale = conv_get_current_locale();
1252         if (!cur_locale) {
1253                 cur_charset = C_US_ASCII;
1254                 return cur_charset;
1255         }
1256
1257         if (strcasestr(cur_locale, ".UTF-8") ||
1258             strcasestr(cur_locale, ".utf8")) {
1259                 cur_charset = C_UTF_8;
1260                 return cur_charset;
1261         }
1262
1263         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1264                 cur_charset = C_ISO_8859_15;
1265                 return cur_charset;
1266         }
1267
1268         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1269                 const gchar *p;
1270
1271                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1272                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1273                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1274                                  strlen(locale_table[i].locale))) {
1275                         cur_charset = locale_table[i].charset;
1276                         return cur_charset;
1277                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1278                          !strchr(p + 1, '.')) {
1279                         if (strlen(cur_locale) == 2 &&
1280                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1281                                 cur_charset = locale_table[i].charset;
1282                                 return cur_charset;
1283                         }
1284                 }
1285         }
1286
1287         cur_charset = C_AUTO;
1288         return cur_charset;
1289 }
1290
1291 static CharSet conv_get_locale_charset_no_utf8(void)
1292 {
1293         static CharSet cur_charset = -1;
1294         const gchar *cur_locale;
1295         const gchar *p;
1296         gchar *tmp;
1297         gint i;
1298
1299         if (prefs_common.broken_are_utf8)
1300                 return conv_get_locale_charset();
1301
1302         if (cur_charset != -1)
1303                 return cur_charset;
1304
1305         cur_locale = conv_get_current_locale();
1306         if (!cur_locale) {
1307                 cur_charset = C_US_ASCII;
1308                 return cur_charset;
1309         }
1310
1311         if (strcasestr(cur_locale, "UTF-8")) {
1312                 tmp = g_strdup(cur_locale);
1313                 *(strcasestr(tmp, ".UTF-8")) = '\0';
1314                 cur_locale = tmp;
1315         }
1316
1317         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1318                 cur_charset = C_ISO_8859_15;
1319                 return cur_charset;
1320         }
1321
1322         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1323                 const gchar *p;
1324
1325                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1326                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1327                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1328                                  strlen(locale_table[i].locale))) {
1329                         cur_charset = locale_table[i].charset;
1330                         return cur_charset;
1331                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1332                          !strchr(p + 1, '.')) {
1333                         if (strlen(cur_locale) == 2 &&
1334                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1335                                 cur_charset = locale_table[i].charset;
1336                                 return cur_charset;
1337                         }
1338                 }
1339         }
1340
1341         cur_charset = C_AUTO;
1342         return cur_charset;
1343 }
1344
1345 const gchar *conv_get_locale_charset_str(void)
1346 {
1347         static const gchar *codeset = NULL;
1348
1349         if (!codeset)
1350                 codeset = conv_get_charset_str(conv_get_locale_charset());
1351
1352         return codeset ? codeset : CS_INTERNAL;
1353 }
1354
1355 const gchar *conv_get_locale_charset_str_no_utf8(void)
1356 {
1357         static const gchar *codeset = NULL;
1358
1359         if (!codeset)
1360                 codeset = conv_get_charset_str(conv_get_locale_charset_no_utf8());
1361
1362         return codeset ? codeset : CS_INTERNAL;
1363 }
1364
1365 static CharSet conv_get_outgoing_charset(void)
1366 {
1367         static CharSet out_charset = -1;
1368         const gchar *cur_locale;
1369         const gchar *p;
1370         gint i;
1371
1372         if (out_charset != -1)
1373                 return out_charset;
1374
1375         cur_locale = conv_get_current_locale();
1376         if (!cur_locale) {
1377                 out_charset = C_AUTO;
1378                 return out_charset;
1379         }
1380
1381         if (strcasestr(cur_locale, "UTF-8")) {
1382                 out_charset = C_UTF_8;
1383                 return out_charset;
1384         }
1385
1386         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1387                 out_charset = C_ISO_8859_15;
1388                 return out_charset;
1389         }
1390
1391         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1392                 const gchar *p;
1393
1394                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1395                                  strlen(locale_table[i].locale))) {
1396                         out_charset = locale_table[i].out_charset;
1397                         break;
1398                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1399                          !strchr(p + 1, '.')) {
1400                         if (strlen(cur_locale) == 2 &&
1401                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1402                                 out_charset = locale_table[i].out_charset;
1403                                 break;
1404                         }
1405                 }
1406         }
1407
1408         return out_charset;
1409 }
1410
1411 const gchar *conv_get_outgoing_charset_str(void)
1412 {
1413         CharSet out_charset;
1414         const gchar *str;
1415
1416         out_charset = conv_get_outgoing_charset();
1417         str = conv_get_charset_str(out_charset);
1418
1419         return str ? str : CS_UTF_8;
1420 }
1421
1422 const gchar *conv_get_current_locale(void)
1423 {
1424         const gchar *cur_locale;
1425
1426 #ifdef G_OS_WIN32
1427         cur_locale = g_win32_getlocale();
1428 #else
1429         cur_locale = g_getenv("LC_ALL");
1430         if (!cur_locale) cur_locale = g_getenv("LC_CTYPE");
1431         if (!cur_locale) cur_locale = g_getenv("LANG");
1432         if (!cur_locale) cur_locale = setlocale(LC_CTYPE, NULL);
1433 #endif /* G_OS_WIN32 */
1434
1435         debug_print("current locale: %s\n",
1436                     cur_locale ? cur_locale : "(none)");
1437
1438         return cur_locale;
1439 }
1440
1441 static gboolean conv_is_ja_locale(void)
1442 {
1443         static gint is_ja_locale = -1;
1444         const gchar *cur_locale;
1445
1446         if (is_ja_locale != -1)
1447                 return is_ja_locale != 0;
1448
1449         is_ja_locale = 0;
1450         cur_locale = conv_get_current_locale();
1451         if (cur_locale) {
1452                 if (g_ascii_strncasecmp(cur_locale, "ja", 2) == 0)
1453                         is_ja_locale = 1;
1454         }
1455
1456         return is_ja_locale != 0;
1457 }
1458
1459 gchar *conv_unmime_header(const gchar *str, const gchar *default_encoding)
1460 {
1461         gchar buf[BUFFSIZE];
1462
1463         if (is_ascii_str(str))
1464                 return unmime_header(str);
1465
1466         if (default_encoding) {
1467                 gchar *utf8_buf;
1468
1469                 utf8_buf = conv_codeset_strdup
1470                         (str, default_encoding, CS_INTERNAL);
1471                 if (utf8_buf) {
1472                         gchar *decoded_str;
1473
1474                         decoded_str = unmime_header(utf8_buf);
1475                         g_free(utf8_buf);
1476                         return decoded_str;
1477                 }
1478         }
1479
1480         if (conv_is_ja_locale())
1481                 conv_anytodisp(buf, sizeof(buf), str);
1482         else
1483                 conv_localetodisp(buf, sizeof(buf), str);
1484
1485         return unmime_header(buf);
1486 }
1487
1488 #define MAX_LINELEN             76
1489 #define MAX_HARD_LINELEN        996
1490 #define MIMESEP_BEGIN           "=?"
1491 #define MIMESEP_END             "?="
1492
1493 #define LBREAK_IF_REQUIRED(cond, is_plain_text)                         \
1494 {                                                                       \
1495         if (len - (destp - (guchar *)dest) < MAX_LINELEN + 2) {         \
1496                 *destp = '\0';                                          \
1497                 return;                                                 \
1498         }                                                               \
1499                                                                         \
1500         if ((cond) && *srcp) {                                          \
1501                 if (destp > (guchar *)dest && left < MAX_LINELEN - 1) { \
1502                         if (isspace(*(destp - 1)))                      \
1503                                 destp--;                                \
1504                         else if (is_plain_text && isspace(*srcp))       \
1505                                 srcp++;                                 \
1506                         if (*srcp) {                                    \
1507                                 *destp++ = '\n';                        \
1508                                 *destp++ = ' ';                         \
1509                                 left = MAX_LINELEN - 1;                 \
1510                         }                                               \
1511                 }                                                       \
1512         }                                                               \
1513 }
1514
1515 void conv_encode_header_full(gchar *dest, gint len, const gchar *src,
1516                         gint header_len, gboolean addr_field,
1517                         const gchar *out_encoding_)
1518 {
1519         const gchar *cur_encoding;
1520         const gchar *out_encoding;
1521         gint mimestr_len;
1522         gchar *mimesep_enc;
1523         gint left;
1524         const guchar *srcp = src;
1525         guchar *destp = dest;
1526         gboolean use_base64;
1527
1528         g_return_if_fail(g_utf8_validate(src, -1, NULL) == TRUE);
1529
1530         if (MB_CUR_MAX > 1) {
1531                 use_base64 = TRUE;
1532                 mimesep_enc = "?B?";
1533         } else {
1534                 use_base64 = FALSE;
1535                 mimesep_enc = "?Q?";
1536         }
1537
1538         cur_encoding = CS_INTERNAL;
1539
1540         if (out_encoding_)
1541                 out_encoding = out_encoding_;
1542         else
1543                 out_encoding = conv_get_outgoing_charset_str();
1544
1545         if (!strcmp(out_encoding, CS_US_ASCII))
1546                 out_encoding = CS_ISO_8859_1;
1547
1548         mimestr_len = strlen(MIMESEP_BEGIN) + strlen(out_encoding) +
1549                 strlen(mimesep_enc) + strlen(MIMESEP_END);
1550
1551         left = MAX_LINELEN - header_len;
1552
1553         while (*srcp) {
1554                 LBREAK_IF_REQUIRED(left <= 0, TRUE);
1555
1556                 while (isspace(*srcp)) {
1557                         *destp++ = *srcp++;
1558                         left--;
1559                         LBREAK_IF_REQUIRED(left <= 0, TRUE);
1560                 }
1561
1562                 /* output as it is if the next word is ASCII string */
1563                 if (!is_next_nonascii(srcp)) {
1564                         gint word_len;
1565
1566                         word_len = get_next_word_len(srcp);
1567                         LBREAK_IF_REQUIRED(left < word_len, TRUE);
1568                         while (word_len > 0) {
1569                                 LBREAK_IF_REQUIRED(left + (MAX_HARD_LINELEN - MAX_LINELEN) <= 0, TRUE)
1570                                 *destp++ = *srcp++;
1571                                 left--;
1572                                 word_len--;
1573                         }
1574
1575                         continue;
1576                 }
1577
1578                 /* don't include parentheses and quotes in encoded strings */
1579                 if (addr_field && (*srcp == '(' || *srcp == ')' || *srcp == '"')) {
1580                         LBREAK_IF_REQUIRED(left < 2, FALSE);
1581                         *destp++ = *srcp++;
1582                         left--;
1583                 }
1584
1585                 while (1) {
1586                         gint mb_len = 0;
1587                         gint cur_len = 0;
1588                         gchar *part_str;
1589                         gchar *out_str;
1590                         gchar *enc_str;
1591                         const guchar *p = srcp;
1592                         gint out_str_len;
1593                         gint out_enc_str_len;
1594                         gint mime_block_len;
1595                         gboolean cont = FALSE;
1596
1597                         while (*p != '\0') {
1598                                 if (isspace(*p) && !is_next_nonascii(p + 1))
1599                                         break;
1600                                 /* don't include parentheses in encoded
1601                                    strings */
1602                                 if (addr_field && (*p == '(' || *p == ')' || *p == '"'))
1603                                         break;
1604
1605                                 mb_len = g_utf8_skip[*p];
1606
1607                                 Xstrndup_a(part_str, srcp, cur_len + mb_len, );
1608                                 out_str = conv_codeset_strdup
1609                                         (part_str, cur_encoding, out_encoding);
1610                                 if (!out_str) {
1611                                         if (strict_mode) {
1612                                                 *dest = '\0';
1613                                                 return;
1614                                         } else {
1615                                                 g_warning("conv_encode_header(): code conversion failed\n");
1616                                                 conv_unreadable_8bit(part_str);
1617                                                 out_str = g_strdup(part_str);
1618                                         }
1619                                 }
1620                                 out_str_len = strlen(out_str);
1621
1622                                 if (use_base64)
1623                                         out_enc_str_len = B64LEN(out_str_len);
1624                                 else
1625                                         out_enc_str_len =
1626                                                 qp_get_q_encoding_len(out_str);
1627
1628                                 g_free(out_str);
1629
1630                                 if (mimestr_len + out_enc_str_len <= left) {
1631                                         cur_len += mb_len;
1632                                         p += mb_len;
1633                                 } else if (cur_len == 0) {
1634                                         LBREAK_IF_REQUIRED(1, FALSE);
1635                                         continue;
1636                                 } else {
1637                                         cont = TRUE;
1638                                         break;
1639                                 }
1640                         }
1641
1642                         if (cur_len > 0) {
1643                                 Xstrndup_a(part_str, srcp, cur_len, );
1644                                 out_str = conv_codeset_strdup
1645                                         (part_str, cur_encoding, out_encoding);
1646                                 if (!out_str) {
1647                                         g_warning("conv_encode_header(): code conversion failed\n");
1648                                         conv_unreadable_8bit(part_str);
1649                                         out_str = g_strdup(part_str);
1650                                 }
1651                                 out_str_len = strlen(out_str);
1652
1653                                 if (use_base64)
1654                                         out_enc_str_len = B64LEN(out_str_len);
1655                                 else
1656                                         out_enc_str_len =
1657                                                 qp_get_q_encoding_len(out_str);
1658
1659                                 Xalloca(enc_str, out_enc_str_len + 1, );
1660                                 if (use_base64)
1661                                         base64_encode(enc_str, out_str, out_str_len);
1662                                 else
1663                                         qp_q_encode(enc_str, out_str);
1664
1665                                 g_free(out_str);
1666
1667                                 /* output MIME-encoded string block */
1668                                 mime_block_len = mimestr_len + strlen(enc_str);
1669                                 g_snprintf(destp, mime_block_len + 1,
1670                                            MIMESEP_BEGIN "%s%s%s" MIMESEP_END,
1671                                            out_encoding, mimesep_enc, enc_str);
1672                                 destp += mime_block_len;
1673                                 srcp += cur_len;
1674
1675                                 left -= mime_block_len;
1676                         }
1677
1678                         LBREAK_IF_REQUIRED(cont, FALSE);
1679
1680                         if (cur_len == 0)
1681                                 break;
1682                 }
1683         }
1684
1685         *destp = '\0';
1686 }
1687
1688 void conv_encode_header(gchar *dest, gint len, const gchar *src,
1689                         gint header_len, gboolean addr_field)
1690 {
1691         conv_encode_header_full(dest,len,src,header_len,addr_field,NULL);
1692 }
1693
1694 #undef LBREAK_IF_REQUIRED
1695 gchar *conv_filename_from_utf8(const gchar *utf8_file)
1696 {
1697         gchar *fs_file;
1698         GError *error = NULL;
1699
1700         fs_file = g_filename_from_utf8(utf8_file, -1, NULL, NULL, &error);
1701         if (error) {
1702                 g_warning("failed to convert encoding of file name: %s\n",
1703                           error->message);
1704                 g_error_free(error);
1705         }
1706         if (!fs_file)
1707                 fs_file = g_strdup(utf8_file);
1708
1709         return fs_file;
1710 }
1711
1712 gchar *conv_filename_to_utf8(const gchar *fs_file)
1713 {
1714         gchar *utf8_file = NULL;
1715         GError *error = NULL;
1716
1717         utf8_file = g_filename_to_utf8(fs_file, -1, NULL, NULL, &error);
1718         if (error) {
1719                 g_warning("failed to convert encoding of file name: %s\n",
1720                           error->message);
1721                 g_error_free(error);
1722         }
1723
1724         if (!utf8_file || !g_utf8_validate(utf8_file, -1, NULL)) {
1725                 g_free(utf8_file);
1726                 utf8_file = g_strdup(fs_file);
1727                 conv_unreadable_8bit(utf8_file);
1728         }
1729
1730         return utf8_file;
1731 }