0d2438bdf3021cb1e622c060344af2125a395c7f
[claws.git] / src / codeconv.c
1 /*
2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3  * Copyright (C) 1999-2012 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 #include "claws-features.h"
23 #endif
24
25 #include "defs.h"
26
27 #include <glib.h>
28 #include <glib/gi18n.h>
29 #include <string.h>
30 #include <ctype.h>
31 #include <stdlib.h>
32 #include <errno.h>
33
34 #if HAVE_LOCALE_H
35 #  include <locale.h>
36 #endif
37
38 #include "codeconv.h"
39 #include "unmime.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 gchar *conv_iconv_strdup         (const gchar    *inbuf,
118                                          const gchar    *src_code,
119                                          const gchar    *dest_code);
120
121 static CharSet conv_get_locale_charset                  (void);
122 static CharSet conv_get_outgoing_charset                (void);
123 static CharSet conv_guess_ja_encoding(const gchar *str);
124 static gboolean conv_is_ja_locale                       (void);
125
126 static gint conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
127 static gint conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf);
128 static gint conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
129
130 static gint conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
131 static gint conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
132 static gint conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
133 static gint conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf);
134
135 static gint conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf);
136 static gint conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf);
137
138 static void conv_unreadable_8bit(gchar *str);
139
140 static gint conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
141 static gint conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
142 static gint conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
143
144 static gint conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
145 static gint conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf);
146 static gint conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf);
147
148 static gboolean strict_mode = FALSE;
149
150 void codeconv_set_strict(gboolean mode)
151 {
152         strict_mode = mode;
153 }
154
155 static gint conv_jistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
156 {
157         const guchar *in = inbuf;
158         gchar *out = outbuf;
159         JISState state = JIS_ASCII;
160
161         /*
162          * Loop outputs up to 3 bytes in each pass (aux kanji) and we
163          * need 1 byte to terminate the output
164          */
165         while (*in != '\0' && (out - outbuf) < outlen - 4) {
166                 if (*in == ESC) {
167                         in++;
168                         if (*in == '$') {
169                                 if (*(in + 1) == '@' || *(in + 1) == 'B') {
170                                         state = JIS_KANJI;
171                                         in += 2;
172                                 } else if (*(in + 1) == '(' &&
173                                            *(in + 2) == 'D') {
174                                         state = JIS_AUXKANJI;
175                                         in += 3;
176                                 } else {
177                                         /* unknown escape sequence */
178                                         state = JIS_ASCII;
179                                 }
180                         } else if (*in == '(') {
181                                 if (*(in + 1) == 'B' || *(in + 1) == 'J') {
182                                         state = JIS_ASCII;
183                                         in += 2;
184                                 } else if (*(in + 1) == 'I') {
185                                         state = JIS_HWKANA;
186                                         in += 2;
187                                 } else {
188                                         /* unknown escape sequence */
189                                         state = JIS_ASCII;
190                                 }
191                         } else {
192                                 /* unknown escape sequence */
193                                 state = JIS_ASCII;
194                         }
195                 } else if (*in == 0x0e) {
196                         state = JIS_HWKANA;
197                         in++;
198                 } else if (*in == 0x0f) {
199                         state = JIS_ASCII;
200                         in++;
201                 } else {
202                         switch (state) {
203                         case JIS_ASCII:
204                                 *out++ = *in++;
205                                 break;
206                         case JIS_KANJI:
207                                 *out++ = *in++ | 0x80;
208                                 if (*in == '\0') break;
209                                 *out++ = *in++ | 0x80;
210                                 break;
211                         case JIS_HWKANA:
212                                 *out++ = 0x8e;
213                                 *out++ = *in++ | 0x80;
214                                 break;
215                         case JIS_AUXKANJI:
216                                 *out++ = 0x8f;
217                                 *out++ = *in++ | 0x80;
218                                 if (*in == '\0') break;
219                                 *out++ = *in++ | 0x80;
220                                 break;
221                         }
222                 }
223         }
224
225         *out = '\0';
226         return 0;
227 }
228
229 #define JIS_HWDAKUTEN           0x5e
230 #define JIS_HWHANDAKUTEN        0x5f
231
232 static gint conv_jis_hantozen(guchar *outbuf, guchar jis_code, guchar sound_sym)
233 {
234         static guint16 h2z_tbl[] = {
235                 /* 0x20 - 0x2f */
236                 0x0000, 0x2123, 0x2156, 0x2157, 0x2122, 0x2126, 0x2572, 0x2521,
237                 0x2523, 0x2525, 0x2527, 0x2529, 0x2563, 0x2565, 0x2567, 0x2543,
238                 /* 0x30 - 0x3f */
239                 0x213c, 0x2522, 0x2524, 0x2526, 0x2528, 0x252a, 0x252b, 0x252d,
240                 0x252f, 0x2531, 0x2533, 0x2535, 0x2537, 0x2539, 0x253b, 0x253d,
241                 /* 0x40 - 0x4f */
242                 0x253f, 0x2541, 0x2544, 0x2546, 0x2548, 0x254a, 0x254b, 0x254c,
243                 0x254d, 0x254e, 0x254f, 0x2552, 0x2555, 0x2558, 0x255b, 0x255e,
244                 /* 0x50 - 0x5f */
245                 0x255f, 0x2560, 0x2561, 0x2562, 0x2564, 0x2566, 0x2568, 0x2569,
246                 0x256a, 0x256b, 0x256c, 0x256d, 0x256f, 0x2573, 0x212b, 0x212c
247         };
248
249         static guint16 dakuten_tbl[] = {
250                 /* 0x30 - 0x3f */
251                 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x252c, 0x252e,
252                 0x2530, 0x2532, 0x2534, 0x2536, 0x2538, 0x253a, 0x253c, 0x253e,
253                 /* 0x40 - 0x4f */
254                 0x2540, 0x2542, 0x2545, 0x2547, 0x2549, 0x0000, 0x0000, 0x0000,
255                 0x0000, 0x0000, 0x2550, 0x2553, 0x2556, 0x2559, 0x255c, 0x0000
256         };
257
258         static guint16 handakuten_tbl[] = {
259                 /* 0x4a - 0x4e */
260                 0x2551, 0x2554, 0x2557, 0x255a, 0x255d
261         };
262
263         guint16 out_code;
264
265         jis_code &= 0x7f;
266         sound_sym &= 0x7f;
267
268         if (jis_code < 0x21 || jis_code > 0x5f)
269                 return 0;
270
271         if (sound_sym == JIS_HWDAKUTEN &&
272             jis_code >= 0x36 && jis_code <= 0x4e) {
273                 out_code = dakuten_tbl[jis_code - 0x30];
274                 if (out_code != 0) {
275                         *outbuf = out_code >> 8;
276                         *(outbuf + 1) = out_code & 0xff;
277                         return 2;
278                 }
279         }
280
281         if (sound_sym == JIS_HWHANDAKUTEN &&
282             jis_code >= 0x4a && jis_code <= 0x4e) {
283                 out_code = handakuten_tbl[jis_code - 0x4a];
284                 *outbuf = out_code >> 8;
285                 *(outbuf + 1) = out_code & 0xff;
286                 return 2;
287         }
288
289         out_code = h2z_tbl[jis_code - 0x20];
290         *outbuf = out_code >> 8;
291         *(outbuf + 1) = out_code & 0xff;
292         return 1;
293 }
294
295 static gint conv_euctojis(gchar *outbuf, gint outlen, const gchar *inbuf)
296 {
297         const guchar *in = inbuf;
298         gchar *out = outbuf;
299         JISState state = JIS_ASCII;
300
301         /*
302          * Loop outputs up to 6 bytes in each pass (aux shift + aux
303          * kanji) and we need up to 4 bytes to terminate the output
304          * (ASCII shift + null)
305          */
306         while (*in != '\0' && (out - outbuf) < outlen - 10) {
307                 if (IS_ASCII(*in)) {
308                         K_OUT();
309                         *out++ = *in++;
310                 } else if (iseuckanji(*in)) {
311                         if (iseuckanji(*(in + 1))) {
312                                 K_IN();
313                                 *out++ = *in++ & 0x7f;
314                                 *out++ = *in++ & 0x7f;
315                         } else {
316                                 K_OUT();
317                                 *out++ = SUBST_CHAR;
318                                 in++;
319                                 if (*in != '\0' && !IS_ASCII(*in)) {
320                                         *out++ = SUBST_CHAR;
321                                         in++;
322                                 }
323                         }
324                 } else if (iseuchwkana1(*in)) {
325                         if (iseuchwkana2(*(in + 1))) {
326                                 if (prefs_common.allow_jisx0201_kana) {
327                                         HW_IN();
328                                         in++;
329                                         *out++ = *in++ & 0x7f;
330                                 } else {
331                                         guchar jis_ch[2];
332                                         gint len;
333
334                                         if (iseuchwkana1(*(in + 2)) &&
335                                             iseuchwkana2(*(in + 3)))
336                                                 len = conv_jis_hantozen
337                                                         (jis_ch,
338                                                          *(in + 1), *(in + 3));
339                                         else
340                                                 len = conv_jis_hantozen
341                                                         (jis_ch,
342                                                          *(in + 1), '\0');
343                                         if (len == 0)
344                                                 in += 2;
345                                         else {
346                                                 K_IN();
347                                                 in += len * 2;
348                                                 *out++ = jis_ch[0];
349                                                 *out++ = jis_ch[1];
350                                         }
351                                 }
352                         } else {
353                                 K_OUT();
354                                 in++;
355                                 if (*in != '\0' && !IS_ASCII(*in)) {
356                                         *out++ = SUBST_CHAR;
357                                         in++;
358                                 }
359                         }
360                 } else if (iseucaux(*in)) {
361                         in++;
362                         if (iseuckanji(*in) && iseuckanji(*(in + 1))) {
363                                 AUX_IN();
364                                 *out++ = *in++ & 0x7f;
365                                 *out++ = *in++ & 0x7f;
366                         } else {
367                                 K_OUT();
368                                 if (*in != '\0' && !IS_ASCII(*in)) {
369                                         *out++ = SUBST_CHAR;
370                                         in++;
371                                         if (*in != '\0' && !IS_ASCII(*in)) {
372                                                 *out++ = SUBST_CHAR;
373                                                 in++;
374                                         }
375                                 }
376                         }
377                 } else {
378                         K_OUT();
379                         *out++ = SUBST_CHAR;
380                         in++;
381                 }
382         }
383
384         K_OUT();
385         *out = '\0';
386         return 0;
387 }
388
389 static gint conv_sjistoeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
390 {
391         const guchar *in = inbuf;
392         gchar *out = outbuf;
393
394         /*
395          * Loop outputs up to 2 bytes in each pass and we need 1 byte
396          * to terminate the output
397          */
398         while (*in != '\0' && (out - outbuf) < outlen - 3) {
399                 if (IS_ASCII(*in)) {
400                         *out++ = *in++;
401                 } else if (issjiskanji1(*in)) {
402                         if (issjiskanji2(*(in + 1))) {
403                                 guchar out1 = *in;
404                                 guchar out2 = *(in + 1);
405                                 guchar row;
406
407                                 row = out1 < 0xa0 ? 0x70 : 0xb0;
408                                 if (out2 < 0x9f) {
409                                         out1 = (out1 - row) * 2 - 1;
410                                         out2 -= out2 > 0x7f ? 0x20 : 0x1f;
411                                 } else {
412                                         out1 = (out1 - row) * 2;
413                                         out2 -= 0x7e;
414                                 }
415
416                                 *out++ = out1 | 0x80;
417                                 *out++ = out2 | 0x80;
418                                 in += 2;
419                         } else {
420                                 *out++ = SUBST_CHAR;
421                                 in++;
422                                 if (*in != '\0' && !IS_ASCII(*in)) {
423                                         *out++ = SUBST_CHAR;
424                                         in++;
425                                 }
426                         }
427                 } else if (issjishwkana(*in)) {
428                         *out++ = 0x8e;
429                         *out++ = *in++;
430                 } else {
431                         *out++ = SUBST_CHAR;
432                         in++;
433                 }
434         }
435
436         *out = '\0';
437         return 0;
438 }
439
440 static gint conv_jistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
441 {
442         gchar *eucstr;
443
444         Xalloca(eucstr, outlen, return -1);
445
446         if (conv_jistoeuc(eucstr, outlen, inbuf) <0)
447                 return -1;
448         if (conv_euctoutf8(outbuf, outlen, eucstr) < 0)
449                 return -1;
450         return 0;
451 }
452
453 static gint conv_sjistoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
454 {
455         gchar *tmpstr;
456
457         tmpstr = conv_iconv_strdup(inbuf, CS_SHIFT_JIS, CS_UTF_8);
458         if (tmpstr) {
459                 strncpy2(outbuf, tmpstr, outlen);
460                 g_free(tmpstr);
461                 return 0;
462         } else {
463                 strncpy2(outbuf, inbuf, outlen);
464                 return -1;
465         }
466 }
467
468 static gint conv_euctoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
469 {
470         static iconv_t cd = (iconv_t)-1;
471         static gboolean iconv_ok = TRUE;
472         gchar *tmpstr;
473
474         if (cd == (iconv_t)-1) {
475                 if (!iconv_ok) {
476                         strncpy2(outbuf, inbuf, outlen);
477                         return -1;
478                 }
479                 cd = iconv_open(CS_UTF_8, CS_EUC_JP_MS);
480                 if (cd == (iconv_t)-1) {
481                         cd = iconv_open(CS_UTF_8, CS_EUC_JP);
482                         if (cd == (iconv_t)-1) {
483                                 g_warning("conv_euctoutf8(): %s",
484                                           g_strerror(errno));
485                                 iconv_ok = FALSE;
486                                 strncpy2(outbuf, inbuf, outlen);
487                                 return -1;
488                         }
489                 }
490         }
491
492         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
493         if (tmpstr) {
494                 strncpy2(outbuf, tmpstr, outlen);
495                 g_free(tmpstr);
496                 return 0;
497         } else {
498                 strncpy2(outbuf, inbuf, outlen);
499                 return -1;
500         }
501 }
502
503 static gint conv_anytoutf8(gchar *outbuf, gint outlen, const gchar *inbuf)
504 {
505         gint r = -1;
506         switch (conv_guess_ja_encoding(inbuf)) {
507         case C_ISO_2022_JP:
508                 r = conv_jistoutf8(outbuf, outlen, inbuf);
509                 break;
510         case C_SHIFT_JIS:
511                 r = conv_sjistoutf8(outbuf, outlen, inbuf);
512                 break;
513         case C_EUC_JP:
514                 r = conv_euctoutf8(outbuf, outlen, inbuf);
515                 break;
516         default:
517                 r = 0;
518                 strncpy2(outbuf, inbuf, outlen);
519                 break;
520         }
521         
522         return r;
523 }
524
525 static gint conv_utf8toeuc(gchar *outbuf, gint outlen, const gchar *inbuf)
526 {
527         static iconv_t cd = (iconv_t)-1;
528         static gboolean iconv_ok = TRUE;
529         gchar *tmpstr;
530
531         if (cd == (iconv_t)-1) {
532                 if (!iconv_ok) {
533                         strncpy2(outbuf, inbuf, outlen);
534                         return -1;
535                 }
536                 cd = iconv_open(CS_EUC_JP_MS, CS_UTF_8);
537                 if (cd == (iconv_t)-1) {
538                         cd = iconv_open(CS_EUC_JP, CS_UTF_8);
539                         if (cd == (iconv_t)-1) {
540                                 g_warning("conv_utf8toeuc(): %s",
541                                           g_strerror(errno));
542                                 iconv_ok = FALSE;
543                                 strncpy2(outbuf, inbuf, outlen);
544                                 return -1;
545                         }
546                 }
547         }
548
549         tmpstr = conv_iconv_strdup_with_cd(inbuf, cd);
550         if (tmpstr) {
551                 strncpy2(outbuf, tmpstr, outlen);
552                 g_free(tmpstr);
553                 return 0;
554         } else {
555                 strncpy2(outbuf, inbuf, outlen);
556                 return -1;
557         }
558 }
559
560 static gint conv_utf8tojis(gchar *outbuf, gint outlen, const gchar *inbuf)
561 {
562         gchar *eucstr;
563
564         Xalloca(eucstr, outlen, return -1);
565
566         if (conv_utf8toeuc(eucstr, outlen, inbuf) < 0)
567                 return -1;
568         if (conv_euctojis(outbuf, outlen, eucstr) < 0)
569                 return -1;
570                 
571         return 0;
572 }
573
574 static void conv_unreadable_8bit(gchar *str)
575 {
576         register guchar *p = str;
577
578         while (*p != '\0') {
579                 /* convert CR+LF -> LF */
580                 if (*p == '\r' && *(p + 1) == '\n')
581                         memmove(p, p + 1, strlen(p));
582                 else if (!IS_ASCII(*p)) *p = SUBST_CHAR;
583                 p++;
584         }
585 }
586
587 static CharSet conv_guess_ja_encoding(const gchar *str)
588 {
589         const guchar *p = str;
590         CharSet guessed = C_US_ASCII;
591
592         while (*p != '\0') {
593                 if (*p == ESC && (*(p + 1) == '$' || *(p + 1) == '(')) {
594                         if (guessed == C_US_ASCII)
595                                 return C_ISO_2022_JP;
596                         p += 2;
597                 } else if (IS_ASCII(*p)) {
598                         p++;
599                 } else if (iseuckanji(*p) && iseuckanji(*(p + 1))) {
600                         if (*p >= 0xfd && *p <= 0xfe)
601                                 return C_EUC_JP;
602                         else if (guessed == C_SHIFT_JIS) {
603                                 if ((issjiskanji1(*p) &&
604                                      issjiskanji2(*(p + 1))) ||
605                                     issjishwkana(*p))
606                                         guessed = C_SHIFT_JIS;
607                                 else
608                                         guessed = C_EUC_JP;
609                         } else
610                                 guessed = C_EUC_JP;
611                         p += 2;
612                 } else if (issjiskanji1(*p) && issjiskanji2(*(p + 1))) {
613                         if (iseuchwkana1(*p) && iseuchwkana2(*(p + 1)))
614                                 guessed = C_SHIFT_JIS;
615                         else
616                                 return C_SHIFT_JIS;
617                         p += 2;
618                 } else if (issjishwkana(*p)) {
619                         guessed = C_SHIFT_JIS;
620                         p++;
621                 } else {
622                         p++;
623                 }
624         }
625
626         return guessed;
627 }
628
629 static gint conv_jistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
630 {
631         return conv_jistoutf8(outbuf, outlen, inbuf);
632 }
633
634 static gint conv_sjistodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
635 {
636         return conv_sjistoutf8(outbuf, outlen, inbuf);
637 }
638
639 static gint conv_euctodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
640 {
641         return conv_euctoutf8(outbuf, outlen, inbuf);
642 }
643
644 void conv_utf8todisp(gchar *outbuf, gint outlen, const gchar *inbuf)
645 {
646         if (g_utf8_validate(inbuf, -1, NULL) == TRUE)
647                 strncpy2(outbuf, inbuf, outlen);
648         else
649                 conv_ustodisp(outbuf, outlen, inbuf);
650 }
651
652 static gint conv_anytodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
653 {
654         gint r = 0;
655         if (conv_anytoutf8(outbuf, outlen, inbuf) < 0)
656                 r = -1;
657         if (g_utf8_validate(outbuf, -1, NULL) != TRUE)
658                 conv_unreadable_8bit(outbuf);
659         return r;
660 }
661
662 static gint conv_ustodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
663 {
664         strncpy2(outbuf, inbuf, outlen);
665         conv_unreadable_8bit(outbuf);
666         
667         return 0;
668 }
669
670 void conv_localetodisp(gchar *outbuf, gint outlen, const gchar *inbuf)
671 {
672         gchar *tmpstr;
673
674         codeconv_set_strict(TRUE);
675         tmpstr = conv_iconv_strdup(inbuf, conv_get_locale_charset_str(),
676                                    CS_INTERNAL);
677         codeconv_set_strict(FALSE);
678         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
679                 strncpy2(outbuf, tmpstr, outlen);
680                 g_free(tmpstr);
681                 return;
682         } else if (tmpstr && !g_utf8_validate(tmpstr, -1, NULL)) {
683                 g_free(tmpstr);
684                 codeconv_set_strict(TRUE);
685                 tmpstr = conv_iconv_strdup(inbuf, 
686                                 conv_get_locale_charset_str_no_utf8(),
687                                 CS_INTERNAL);
688                 codeconv_set_strict(FALSE);
689         }
690         if (tmpstr && g_utf8_validate(tmpstr, -1, NULL)) {
691                 strncpy2(outbuf, tmpstr, outlen);
692                 g_free(tmpstr);
693                 return;
694         } else {
695                 g_free(tmpstr);
696                 conv_utf8todisp(outbuf, outlen, inbuf);
697         }
698 }
699
700 static gint conv_noconv(gchar *outbuf, gint outlen, const gchar *inbuf)
701 {
702         strncpy2(outbuf, inbuf, outlen);
703         return 0;
704 }
705
706 static const gchar *
707 conv_get_fallback_for_private_encoding(const gchar *encoding)
708 {
709         if (encoding && (encoding[0] == 'X' || encoding[0] == 'x') &&
710             encoding[1] == '-') {
711                 if (!g_ascii_strcasecmp(encoding, CS_X_MACCYR))
712                         return CS_MACCYR;
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                 return 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         if (!strcmp2(src_code, dest_code)) {
768                 CharSet dest_charset = conv_get_charset_from_str(dest_code);
769                 if (strict_mode && dest_charset == C_UTF_8) {
770                         /* ensure valid UTF-8 if target is UTF-8 */
771                         if (!g_utf8_validate(inbuf, -1, NULL)) {
772                                 return NULL;
773                         }
774                 }
775                 /* otherwise, try for a lucky day */
776                 return g_strdup(inbuf);
777         }
778
779         src_code = conv_get_fallback_for_private_encoding(src_code);
780         conv_func = conv_get_code_conv_func(src_code, dest_code);
781         if (conv_func == conv_ustodisp && strict_mode && !is_ascii_str(inbuf))
782                 return NULL;
783
784         if (conv_func != conv_noconv) {
785                 len = (strlen(inbuf) + 1) * 3;
786                 buf = g_malloc(len);
787
788                 if (conv_func(buf, len, inbuf) == 0 || !strict_mode)
789                         return g_realloc(buf, strlen(buf) + 1);
790                 else {
791                         g_free(buf);
792                         return NULL;
793                 }
794         }
795
796         return conv_iconv_strdup(inbuf, src_code, dest_code);
797 }
798
799 static CodeConvFunc conv_get_code_conv_func(const gchar *src_charset_str,
800                                      const gchar *dest_charset_str)
801 {
802         CodeConvFunc code_conv = conv_noconv;
803         CharSet src_charset;
804         CharSet dest_charset;
805
806         if (!src_charset_str)
807                 src_charset = conv_get_locale_charset();
808         else
809                 src_charset = conv_get_charset_from_str(src_charset_str);
810
811         /* auto detection mode */
812         if (!src_charset_str && !dest_charset_str) {
813                 if (conv_is_ja_locale())
814                         return conv_anytodisp;
815                 else
816                         return conv_noconv;
817         }
818
819         dest_charset = conv_get_charset_from_str(dest_charset_str);
820
821         if (dest_charset == C_US_ASCII)
822                 return conv_ustodisp;
823
824         switch (src_charset) {
825         case C_US_ASCII:
826         case C_ISO_8859_1:
827         case C_ISO_8859_2:
828         case C_ISO_8859_3:
829         case C_ISO_8859_4:
830         case C_ISO_8859_5:
831         case C_ISO_8859_6:
832         case C_ISO_8859_7:
833         case C_ISO_8859_8:
834         case C_ISO_8859_9:
835         case C_ISO_8859_10:
836         case C_ISO_8859_11:
837         case C_ISO_8859_13:
838         case C_ISO_8859_14:
839         case C_ISO_8859_15:
840                 break;
841         case C_ISO_2022_JP:
842         case C_ISO_2022_JP_2:
843         case C_ISO_2022_JP_3:
844                 if (dest_charset == C_AUTO)
845                         code_conv = conv_jistodisp;
846                 else if (dest_charset == C_EUC_JP)
847                         code_conv = conv_jistoeuc;
848                 else if (dest_charset == C_UTF_8)
849                         code_conv = conv_jistoutf8;
850                 break;
851         case C_SHIFT_JIS:
852                 if (dest_charset == C_AUTO)
853                         code_conv = conv_sjistodisp;
854                 else if (dest_charset == C_EUC_JP)
855                         code_conv = conv_sjistoeuc;
856                 else if (dest_charset == C_UTF_8)
857                         code_conv = conv_sjistoutf8;
858                 break;
859         case C_EUC_JP:
860                 if (dest_charset == C_AUTO)
861                         code_conv = conv_euctodisp;
862                 else if (dest_charset == C_ISO_2022_JP   ||
863                          dest_charset == C_ISO_2022_JP_2 ||
864                          dest_charset == C_ISO_2022_JP_3)
865                         code_conv = conv_euctojis;
866                 else if (dest_charset == C_UTF_8)
867                         code_conv = conv_euctoutf8;
868                 break;
869         case C_UTF_8:
870                 if (dest_charset == C_EUC_JP)
871                         code_conv = conv_utf8toeuc;
872                 else if (dest_charset == C_ISO_2022_JP   ||
873                          dest_charset == C_ISO_2022_JP_2 ||
874                          dest_charset == C_ISO_2022_JP_3)
875                         code_conv = conv_utf8tojis;
876                 break;
877         default:
878                 break;
879         }
880
881         return code_conv;
882 }
883
884 static gchar *conv_iconv_strdup(const gchar *inbuf,
885                          const gchar *src_code, const gchar *dest_code)
886 {
887         iconv_t cd;
888         gchar *outbuf;
889
890         if (!src_code && !dest_code && 
891             g_utf8_validate(inbuf, -1, NULL))
892                 return g_strdup(inbuf);
893
894         if (!src_code)
895                 src_code = conv_get_outgoing_charset_str();
896         if (!dest_code)
897                 dest_code = CS_INTERNAL;
898
899         /* don't convert if src and dest codeset are identical */
900         if (!strcasecmp(src_code, dest_code))
901                 return g_strdup(inbuf);
902
903         /* don't convert if dest codeset is US-ASCII */
904         if (!strcasecmp(src_code, CS_US_ASCII))
905                 return g_strdup(inbuf);
906
907         /* don't convert if dest codeset is US-ASCII */
908         if (!strcasecmp(dest_code, CS_US_ASCII))
909                 return g_strdup(inbuf);
910
911         cd = iconv_open(dest_code, src_code);
912         if (cd == (iconv_t)-1)
913                 return NULL;
914
915         outbuf = conv_iconv_strdup_with_cd(inbuf, cd);
916
917         iconv_close(cd);
918
919         return outbuf;
920 }
921
922 gchar *conv_iconv_strdup_with_cd(const gchar *inbuf, iconv_t cd)
923 {
924         const gchar *inbuf_p;
925         gchar *outbuf;
926         gchar *outbuf_p;
927         size_t in_size;
928         size_t in_left;
929         size_t out_size;
930         size_t out_left;
931         size_t n_conv;
932         size_t len;
933
934         inbuf_p = inbuf;
935         in_size = strlen(inbuf);
936         in_left = in_size;
937         out_size = (in_size + 1) * 2;
938         outbuf = g_malloc(out_size);
939         outbuf_p = outbuf;
940         out_left = out_size;
941
942 #define EXPAND_BUF()                            \
943 {                                               \
944         len = outbuf_p - outbuf;                \
945         out_size *= 2;                          \
946         outbuf = g_realloc(outbuf, out_size);   \
947         outbuf_p = outbuf + len;                \
948         out_left = out_size - len;              \
949 }
950
951         while ((n_conv = iconv(cd, (ICONV_CONST gchar **)&inbuf_p, &in_left,
952                                &outbuf_p, &out_left)) == (size_t)-1) {
953                 if (EILSEQ == errno) {
954                         if (strict_mode) {
955                                 g_free(outbuf);
956                                 return NULL;
957                         }
958                         //g_print("iconv(): at %d: %s\n", in_size - in_left, g_strerror(errno));
959                         inbuf_p++;
960                         in_left--;
961                         if (out_left == 0) {
962                                 EXPAND_BUF();
963                         }
964                         *outbuf_p++ = SUBST_CHAR;
965                         out_left--;
966                 } else if (EINVAL == errno) {
967                         break;
968                 } else if (E2BIG == errno) {
969                         EXPAND_BUF();
970                 } else {
971                         g_warning("conv_iconv_strdup(): %s",
972                                   g_strerror(errno));
973                         break;
974                 }
975         }
976
977         while ((n_conv = iconv(cd, NULL, NULL, &outbuf_p, &out_left)) ==
978                (size_t)-1) {
979                 if (E2BIG == errno) {
980                         EXPAND_BUF();
981                 } else {
982                         g_warning("conv_iconv_strdup(): %s",
983                                   g_strerror(errno));
984                         break;
985                 }
986         }
987
988 #undef EXPAND_BUF
989
990         len = outbuf_p - outbuf;
991         outbuf = g_realloc(outbuf, len + 1);
992         outbuf[len] = '\0';
993
994         return outbuf;
995 }
996
997 static const struct {
998         CharSet charset;
999         gchar *const name;
1000 } charsets[] = {
1001         {C_US_ASCII,            CS_US_ASCII},
1002         {C_US_ASCII,            CS_ANSI_X3_4_1968},
1003         {C_UTF_8,               CS_UTF_8},
1004         {C_UTF_7,               CS_UTF_7},
1005         {C_ISO_8859_1,          CS_ISO_8859_1},
1006         {C_ISO_8859_2,          CS_ISO_8859_2},
1007         {C_ISO_8859_3,          CS_ISO_8859_3},
1008         {C_ISO_8859_4,          CS_ISO_8859_4},
1009         {C_ISO_8859_5,          CS_ISO_8859_5},
1010         {C_ISO_8859_6,          CS_ISO_8859_6},
1011         {C_ISO_8859_7,          CS_ISO_8859_7},
1012         {C_ISO_8859_8,          CS_ISO_8859_8},
1013         {C_ISO_8859_9,          CS_ISO_8859_9},
1014         {C_ISO_8859_10,         CS_ISO_8859_10},
1015         {C_ISO_8859_11,         CS_ISO_8859_11},
1016         {C_ISO_8859_13,         CS_ISO_8859_13},
1017         {C_ISO_8859_14,         CS_ISO_8859_14},
1018         {C_ISO_8859_15,         CS_ISO_8859_15},
1019         {C_BALTIC,              CS_BALTIC},
1020         {C_CP1250,              CS_CP1250},
1021         {C_CP1251,              CS_CP1251},
1022         {C_CP1252,              CS_CP1252},
1023         {C_CP1253,              CS_CP1253},
1024         {C_CP1254,              CS_CP1254},
1025         {C_CP1255,              CS_CP1255},
1026         {C_CP1256,              CS_CP1256},
1027         {C_CP1257,              CS_CP1257},
1028         {C_CP1258,              CS_CP1258},
1029         {C_WINDOWS_1250,        CS_WINDOWS_1250},
1030         {C_WINDOWS_1251,        CS_WINDOWS_1251},
1031         {C_WINDOWS_1252,        CS_WINDOWS_1252},
1032         {C_WINDOWS_1253,        CS_WINDOWS_1253},
1033         {C_WINDOWS_1254,        CS_WINDOWS_1254},
1034         {C_WINDOWS_1255,        CS_WINDOWS_1255},
1035         {C_WINDOWS_1256,        CS_WINDOWS_1256},
1036         {C_WINDOWS_1257,        CS_WINDOWS_1257},
1037         {C_WINDOWS_1258,        CS_WINDOWS_1258},
1038         {C_KOI8_R,              CS_KOI8_R},
1039         {C_MACCYR,              CS_MACCYR},
1040         {C_KOI8_T,              CS_KOI8_T},
1041         {C_KOI8_U,              CS_KOI8_U},
1042         {C_ISO_2022_JP,         CS_ISO_2022_JP},
1043         {C_ISO_2022_JP_2,       CS_ISO_2022_JP_2},
1044         {C_ISO_2022_JP_3,       CS_ISO_2022_JP_3},
1045         {C_EUC_JP,              CS_EUC_JP},
1046         {C_EUC_JP,              CS_EUCJP},
1047         {C_EUC_JP_MS,           CS_EUC_JP_MS},
1048         {C_SHIFT_JIS,           CS_SHIFT_JIS},
1049         {C_SHIFT_JIS,           CS_SHIFT__JIS},
1050         {C_SHIFT_JIS,           CS_SJIS},
1051         {C_ISO_2022_KR,         CS_ISO_2022_KR},
1052         {C_EUC_KR,              CS_EUC_KR},
1053         {C_ISO_2022_CN,         CS_ISO_2022_CN},
1054         {C_EUC_CN,              CS_EUC_CN},
1055         {C_GB18030,             CS_GB18030},
1056         {C_GB2312,              CS_GB2312},
1057         {C_GBK,                 CS_GBK},
1058         {C_EUC_TW,              CS_EUC_TW},
1059         {C_BIG5,                CS_BIG5},
1060         {C_BIG5_HKSCS,          CS_BIG5_HKSCS},
1061         {C_TIS_620,             CS_TIS_620},
1062         {C_WINDOWS_874,         CS_WINDOWS_874},
1063         {C_GEORGIAN_PS,         CS_GEORGIAN_PS},
1064         {C_TCVN5712_1,          CS_TCVN5712_1},
1065 };
1066
1067 static const struct {
1068         gchar *const locale;
1069         CharSet charset;
1070         CharSet out_charset;
1071 } locale_table[] = {
1072         {"ja_JP.eucJP"  , C_EUC_JP      , C_ISO_2022_JP},
1073         {"ja_JP.EUC-JP" , C_EUC_JP      , C_ISO_2022_JP},
1074         {"ja_JP.EUC"    , C_EUC_JP      , C_ISO_2022_JP},
1075         {"ja_JP.ujis"   , C_EUC_JP      , C_ISO_2022_JP},
1076         {"ja_JP.SJIS"   , C_SHIFT_JIS   , C_ISO_2022_JP},
1077         {"ja_JP.JIS"    , C_ISO_2022_JP , C_ISO_2022_JP},
1078 #ifdef G_OS_WIN32
1079         {"ja_JP"        , C_SHIFT_JIS   , C_ISO_2022_JP},
1080 #else
1081         {"ja_JP"        , C_EUC_JP      , C_ISO_2022_JP},
1082 #endif
1083         {"ko_KR.EUC-KR" , C_EUC_KR      , C_EUC_KR},
1084         {"ko_KR"        , C_EUC_KR      , C_EUC_KR},
1085         {"zh_CN.GB18030"        , C_GB18030     , C_GB18030},
1086         {"zh_CN.GB2312" , C_GB2312      , C_GB2312},
1087         {"zh_CN.GBK"    , C_GBK         , C_GBK},
1088         {"zh_CN"        , C_GB18030     , C_GB18030},
1089         {"zh_HK"        , C_BIG5_HKSCS  , C_BIG5_HKSCS},
1090         {"zh_TW.eucTW"  , C_EUC_TW      , C_BIG5},
1091         {"zh_TW.EUC-TW" , C_EUC_TW      , C_BIG5},
1092         {"zh_TW.Big5"   , C_BIG5        , C_BIG5},
1093         {"zh_TW"        , C_BIG5        , C_BIG5},
1094
1095         {"ru_RU.KOI8-R" , C_KOI8_R      , C_KOI8_R},
1096         {"ru_RU.KOI8R"  , C_KOI8_R      , C_KOI8_R},
1097         {"ru_RU.CP1251" , C_WINDOWS_1251, C_KOI8_R},
1098 #ifdef G_OS_WIN32
1099         {"ru_RU"        , C_WINDOWS_1251, C_KOI8_R},
1100 #else
1101         {"ru_RU"        , C_ISO_8859_5  , C_KOI8_R},
1102 #endif
1103         {"tg_TJ"        , C_KOI8_T      , C_KOI8_T},
1104         {"ru_UA"        , C_KOI8_U      , C_KOI8_U},
1105         {"uk_UA.CP1251" , C_WINDOWS_1251, C_KOI8_U},
1106         {"uk_UA"        , C_KOI8_U      , C_KOI8_U},
1107
1108         {"be_BY"        , C_WINDOWS_1251, C_WINDOWS_1251},
1109         {"bg_BG"        , C_WINDOWS_1251, C_WINDOWS_1251},
1110
1111         {"yi_US"        , C_WINDOWS_1255, C_WINDOWS_1255},
1112
1113         {"af_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1114         {"br_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1115         {"ca_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1116         {"da_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1117         {"de_AT"        , C_ISO_8859_1  , C_ISO_8859_1},
1118         {"de_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1119         {"de_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1120         {"de_DE"        , C_ISO_8859_1  , C_ISO_8859_1},
1121         {"de_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1122         {"en_AU"        , C_ISO_8859_1  , C_ISO_8859_1},
1123         {"en_BW"        , C_ISO_8859_1  , C_ISO_8859_1},
1124         {"en_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1125         {"en_DK"        , C_ISO_8859_1  , C_ISO_8859_1},
1126         {"en_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1127         {"en_HK"        , C_ISO_8859_1  , C_ISO_8859_1},
1128         {"en_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1129         {"en_NZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1130         {"en_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1131         {"en_SG"        , C_ISO_8859_1  , C_ISO_8859_1},
1132         {"en_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1133         {"en_ZA"        , C_ISO_8859_1  , C_ISO_8859_1},
1134         {"en_ZW"        , C_ISO_8859_1  , C_ISO_8859_1},
1135         {"es_AR"        , C_ISO_8859_1  , C_ISO_8859_1},
1136         {"es_BO"        , C_ISO_8859_1  , C_ISO_8859_1},
1137         {"es_CL"        , C_ISO_8859_1  , C_ISO_8859_1},
1138         {"es_CO"        , C_ISO_8859_1  , C_ISO_8859_1},
1139         {"es_CR"        , C_ISO_8859_1  , C_ISO_8859_1},
1140         {"es_DO"        , C_ISO_8859_1  , C_ISO_8859_1},
1141         {"es_EC"        , C_ISO_8859_1  , C_ISO_8859_1},
1142         {"es_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1143         {"es_GT"        , C_ISO_8859_1  , C_ISO_8859_1},
1144         {"es_HN"        , C_ISO_8859_1  , C_ISO_8859_1},
1145         {"es_MX"        , C_ISO_8859_1  , C_ISO_8859_1},
1146         {"es_NI"        , C_ISO_8859_1  , C_ISO_8859_1},
1147         {"es_PA"        , C_ISO_8859_1  , C_ISO_8859_1},
1148         {"es_PE"        , C_ISO_8859_1  , C_ISO_8859_1},
1149         {"es_PR"        , C_ISO_8859_1  , C_ISO_8859_1},
1150         {"es_PY"        , C_ISO_8859_1  , C_ISO_8859_1},
1151         {"es_SV"        , C_ISO_8859_1  , C_ISO_8859_1},
1152         {"es_US"        , C_ISO_8859_1  , C_ISO_8859_1},
1153         {"es_UY"        , C_ISO_8859_1  , C_ISO_8859_1},
1154         {"es_VE"        , C_ISO_8859_1  , C_ISO_8859_1},
1155         {"et_EE"        , C_ISO_8859_1  , C_ISO_8859_1},
1156         {"eu_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1157         {"fi_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1158         {"fo_FO"        , C_ISO_8859_1  , C_ISO_8859_1},
1159         {"fr_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1160         {"fr_CA"        , C_ISO_8859_1  , C_ISO_8859_1},
1161         {"fr_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1162         {"fr_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1163         {"fr_LU"        , C_ISO_8859_1  , C_ISO_8859_1},
1164         {"ga_IE"        , C_ISO_8859_1  , C_ISO_8859_1},
1165         {"gl_ES"        , C_ISO_8859_1  , C_ISO_8859_1},
1166         {"gv_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1167         {"id_ID"        , C_ISO_8859_1  , C_ISO_8859_1},
1168         {"is_IS"        , C_ISO_8859_1  , C_ISO_8859_1},
1169         {"it_CH"        , C_ISO_8859_1  , C_ISO_8859_1},
1170         {"it_IT"        , C_ISO_8859_1  , C_ISO_8859_1},
1171         {"kl_GL"        , C_ISO_8859_1  , C_ISO_8859_1},
1172         {"kw_GB"        , C_ISO_8859_1  , C_ISO_8859_1},
1173         {"ms_MY"        , C_ISO_8859_1  , C_ISO_8859_1},
1174         {"nl_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1175         {"nl_NL"        , C_ISO_8859_1  , C_ISO_8859_1},
1176         {"nb_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1177         {"nn_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1178         {"no_NO"        , C_ISO_8859_1  , C_ISO_8859_1},
1179         {"oc_FR"        , C_ISO_8859_1  , C_ISO_8859_1},
1180         {"pt_BR"        , C_ISO_8859_1  , C_ISO_8859_1},
1181         {"pt_PT"        , C_ISO_8859_1  , C_ISO_8859_1},
1182         {"sq_AL"        , C_ISO_8859_1  , C_ISO_8859_1},
1183         {"sv_FI"        , C_ISO_8859_1  , C_ISO_8859_1},
1184         {"sv_SE"        , C_ISO_8859_1  , C_ISO_8859_1},
1185         {"tl_PH"        , C_ISO_8859_1  , C_ISO_8859_1},
1186         {"uz_UZ"        , C_ISO_8859_1  , C_ISO_8859_1},
1187         {"wa_BE"        , C_ISO_8859_1  , C_ISO_8859_1},
1188
1189         {"bs_BA"        , C_ISO_8859_2  , C_ISO_8859_2},
1190         {"cs_CZ"        , C_ISO_8859_2  , C_ISO_8859_2},
1191         {"hr_HR"        , C_ISO_8859_2  , C_ISO_8859_2},
1192         {"hu_HU"        , C_ISO_8859_2  , C_ISO_8859_2},
1193         {"pl_PL"        , C_ISO_8859_2  , C_ISO_8859_2},
1194         {"ro_RO"        , C_ISO_8859_2  , C_ISO_8859_2},
1195         {"sk_SK"        , C_ISO_8859_2  , C_ISO_8859_2},
1196         {"sl_SI"        , C_ISO_8859_2  , C_ISO_8859_2},
1197
1198         {"sr_YU@cyrillic"       , C_ISO_8859_5  , C_ISO_8859_5},
1199         {"sr_YU"                , C_ISO_8859_2  , C_ISO_8859_2},
1200
1201         {"mt_MT"                , C_ISO_8859_3  , C_ISO_8859_3},
1202
1203         {"lt_LT.iso88594"       , C_ISO_8859_4  , C_ISO_8859_4},
1204         {"lt_LT.ISO8859-4"      , C_ISO_8859_4  , C_ISO_8859_4},
1205         {"lt_LT.ISO_8859-4"     , C_ISO_8859_4  , C_ISO_8859_4},
1206         {"lt_LT"                , C_ISO_8859_13 , C_ISO_8859_13},
1207
1208         {"mk_MK"        , C_ISO_8859_5  , C_ISO_8859_5},
1209
1210         {"ar_AE"        , C_ISO_8859_6  , C_ISO_8859_6},
1211         {"ar_BH"        , C_ISO_8859_6  , C_ISO_8859_6},
1212         {"ar_DZ"        , C_ISO_8859_6  , C_ISO_8859_6},
1213         {"ar_EG"        , C_ISO_8859_6  , C_ISO_8859_6},
1214         {"ar_IQ"        , C_ISO_8859_6  , C_ISO_8859_6},
1215         {"ar_JO"        , C_ISO_8859_6  , C_ISO_8859_6},
1216         {"ar_KW"        , C_ISO_8859_6  , C_ISO_8859_6},
1217         {"ar_LB"        , C_ISO_8859_6  , C_ISO_8859_6},
1218         {"ar_LY"        , C_ISO_8859_6  , C_ISO_8859_6},
1219         {"ar_MA"        , C_ISO_8859_6  , C_ISO_8859_6},
1220         {"ar_OM"        , C_ISO_8859_6  , C_ISO_8859_6},
1221         {"ar_QA"        , C_ISO_8859_6  , C_ISO_8859_6},
1222         {"ar_SA"        , C_ISO_8859_6  , C_ISO_8859_6},
1223         {"ar_SD"        , C_ISO_8859_6  , C_ISO_8859_6},
1224         {"ar_SY"        , C_ISO_8859_6  , C_ISO_8859_6},
1225         {"ar_TN"        , C_ISO_8859_6  , C_ISO_8859_6},
1226         {"ar_YE"        , C_ISO_8859_6  , C_ISO_8859_6},
1227
1228         {"el_GR"        , C_ISO_8859_7  , C_ISO_8859_7},
1229         {"he_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1230         {"iw_IL"        , C_ISO_8859_8  , C_ISO_8859_8},
1231         {"tr_TR"        , C_ISO_8859_9  , C_ISO_8859_9},
1232
1233         {"lv_LV"        , C_ISO_8859_13 , C_ISO_8859_13},
1234         {"mi_NZ"        , C_ISO_8859_13 , C_ISO_8859_13},
1235
1236         {"cy_GB"        , C_ISO_8859_14 , C_ISO_8859_14},
1237
1238         {"ar_IN"        , C_UTF_8       , C_UTF_8},
1239         {"en_IN"        , C_UTF_8       , C_UTF_8},
1240         {"se_NO"        , C_UTF_8       , C_UTF_8},
1241         {"ta_IN"        , C_UTF_8       , C_UTF_8},
1242         {"te_IN"        , C_UTF_8       , C_UTF_8},
1243         {"ur_PK"        , C_UTF_8       , C_UTF_8},
1244
1245         {"th_TH"        , C_TIS_620     , C_TIS_620},
1246         /* {"th_TH"     , C_WINDOWS_874}, */
1247         /* {"th_TH"     , C_ISO_8859_11}, */
1248
1249         {"ka_GE"        , C_GEORGIAN_PS , C_GEORGIAN_PS},
1250         {"vi_VN.TCVN"   , C_TCVN5712_1  , C_TCVN5712_1},
1251
1252         {"C"                    , C_US_ASCII    , C_US_ASCII},
1253         {"POSIX"                , C_US_ASCII    , C_US_ASCII},
1254         {"ANSI_X3.4-1968"       , C_US_ASCII    , C_US_ASCII},
1255 };
1256
1257 static GHashTable *conv_get_charset_to_str_table(void)
1258 {
1259         static GHashTable *table;
1260         gint i;
1261
1262         if (table)
1263                 return table;
1264
1265         table = g_hash_table_new(NULL, g_direct_equal);
1266
1267         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1268                 if (g_hash_table_lookup(table, GUINT_TO_POINTER(charsets[i].charset))
1269                     == NULL) {
1270                         g_hash_table_insert
1271                                 (table, GUINT_TO_POINTER(charsets[i].charset),
1272                                  charsets[i].name);
1273                 }
1274         }
1275
1276         return table;
1277 }
1278
1279 static GHashTable *conv_get_charset_from_str_table(void)
1280 {
1281         static GHashTable *table;
1282         gint i;
1283
1284         if (table)
1285                 return table;
1286
1287         table = g_hash_table_new(str_case_hash, str_case_equal);
1288
1289         for (i = 0; i < sizeof(charsets) / sizeof(charsets[0]); i++) {
1290                 g_hash_table_insert(table, charsets[i].name,
1291                                     GUINT_TO_POINTER(charsets[i].charset));
1292         }
1293
1294         return table;
1295 }
1296
1297 const gchar *conv_get_charset_str(CharSet charset)
1298 {
1299         GHashTable *table;
1300
1301         table = conv_get_charset_to_str_table();
1302         return g_hash_table_lookup(table, GUINT_TO_POINTER(charset));
1303 }
1304
1305 CharSet conv_get_charset_from_str(const gchar *charset)
1306 {
1307         GHashTable *table;
1308
1309         if (!charset) return C_AUTO;
1310
1311         table = conv_get_charset_from_str_table();
1312         return GPOINTER_TO_UINT(g_hash_table_lookup(table, charset));
1313 }
1314
1315 static CharSet conv_get_locale_charset(void)
1316 {
1317         static CharSet cur_charset = -1;
1318         const gchar *cur_locale;
1319         const gchar *p;
1320         gint i;
1321
1322         if (cur_charset != -1)
1323                 return cur_charset;
1324
1325         cur_locale = conv_get_current_locale();
1326         if (!cur_locale) {
1327                 cur_charset = C_US_ASCII;
1328                 return cur_charset;
1329         }
1330
1331         if (strcasestr(cur_locale, "UTF-8") ||
1332             strcasestr(cur_locale, "utf8")) {
1333                 cur_charset = C_UTF_8;
1334                 return cur_charset;
1335         }
1336
1337         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1338                 cur_charset = C_ISO_8859_15;
1339                 return cur_charset;
1340         }
1341
1342         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1343                 const gchar *p;
1344
1345                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1346                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1347                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1348                                  strlen(locale_table[i].locale))) {
1349                         cur_charset = locale_table[i].charset;
1350                         return cur_charset;
1351                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1352                          !strchr(p + 1, '.')) {
1353                         if (strlen(cur_locale) == 2 &&
1354                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1355                                 cur_charset = locale_table[i].charset;
1356                                 return cur_charset;
1357                         }
1358                 }
1359         }
1360
1361         cur_charset = C_AUTO;
1362         return cur_charset;
1363 }
1364
1365 static CharSet conv_get_locale_charset_no_utf8(void)
1366 {
1367         static CharSet cur_charset = -1;
1368         const gchar *cur_locale;
1369         const gchar *p;
1370         gint i;
1371
1372         if (prefs_common.broken_are_utf8) {
1373                 cur_charset = C_UTF_8;
1374                 return cur_charset;
1375         }
1376
1377         cur_locale = conv_get_current_locale();
1378         if (!cur_locale) {
1379                 cur_charset = C_US_ASCII;
1380                 return cur_charset;
1381         }
1382
1383         if (strcasestr(cur_locale, "UTF-8") ||
1384             strcasestr(cur_locale, "utf8")) {
1385                 cur_charset = C_UTF_8;
1386                 return cur_charset;
1387         }
1388
1389         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1390                 cur_charset = C_ISO_8859_15;
1391                 return cur_charset;
1392         }
1393
1394         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1395                 const gchar *p;
1396
1397                 /* "ja_JP.EUC" matches with "ja_JP.eucJP", "ja_JP.EUC" and
1398                    "ja_JP". "ja_JP" matches with "ja_JP.xxxx" and "ja" */
1399                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1400                                  strlen(locale_table[i].locale))) {
1401                         cur_charset = locale_table[i].charset;
1402                         return cur_charset;
1403                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1404                          !strchr(p + 1, '.')) {
1405                         if (strlen(cur_locale) == 2 &&
1406                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1407                                 cur_charset = locale_table[i].charset;
1408                                 return cur_charset;
1409                         }
1410                 }
1411         }
1412
1413         cur_charset = C_AUTO;
1414         return cur_charset;
1415 }
1416
1417 const gchar *conv_get_locale_charset_str(void)
1418 {
1419         static const gchar *codeset = NULL;
1420
1421         if (!codeset)
1422                 codeset = conv_get_charset_str(conv_get_locale_charset());
1423
1424         return codeset ? codeset : CS_INTERNAL;
1425 }
1426
1427 const gchar *conv_get_locale_charset_str_no_utf8(void)
1428 {
1429         static const gchar *codeset = NULL;
1430
1431         if (!codeset)
1432                 codeset = conv_get_charset_str(conv_get_locale_charset_no_utf8());
1433
1434         return codeset ? codeset : CS_INTERNAL;
1435 }
1436
1437 static CharSet conv_get_outgoing_charset(void)
1438 {
1439         static CharSet out_charset = -1;
1440         const gchar *cur_locale;
1441         const gchar *p;
1442         gint i;
1443
1444         if (out_charset != -1)
1445                 return out_charset;
1446
1447         cur_locale = conv_get_current_locale();
1448         if (!cur_locale) {
1449                 out_charset = C_AUTO;
1450                 return out_charset;
1451         }
1452
1453         if (strcasestr(cur_locale, "UTF-8") ||
1454             strcasestr(cur_locale, "utf8")) {
1455                 out_charset = C_UTF_8;
1456                 return out_charset;
1457         }
1458
1459         if ((p = strcasestr(cur_locale, "@euro")) && p[5] == '\0') {
1460                 out_charset = C_ISO_8859_15;
1461                 return out_charset;
1462         }
1463
1464         for (i = 0; i < sizeof(locale_table) / sizeof(locale_table[0]); i++) {
1465                 const gchar *p;
1466
1467                 if (!g_ascii_strncasecmp(cur_locale, locale_table[i].locale,
1468                                  strlen(locale_table[i].locale))) {
1469                         out_charset = locale_table[i].out_charset;
1470                         break;
1471                 } else if ((p = strchr(locale_table[i].locale, '_')) &&
1472                          !strchr(p + 1, '.')) {
1473                         if (strlen(cur_locale) == 2 &&
1474                             !g_ascii_strncasecmp(cur_locale, locale_table[i].locale, 2)) {
1475                                 out_charset = locale_table[i].out_charset;
1476                                 break;
1477                         }
1478                 }
1479         }
1480
1481         return out_charset;
1482 }
1483
1484 const gchar *conv_get_outgoing_charset_str(void)
1485 {
1486         CharSet out_charset;
1487         const gchar *str;
1488
1489         out_charset = conv_get_outgoing_charset();
1490         str = conv_get_charset_str(out_charset);
1491
1492         return str ? str : CS_UTF_8;
1493 }
1494
1495 const gchar *conv_get_current_locale(void)
1496 {
1497         const gchar *cur_locale;
1498
1499 #ifdef G_OS_WIN32
1500         cur_locale = g_win32_getlocale();
1501 #else
1502         cur_locale = g_getenv("LC_ALL");
1503         if (!cur_locale) cur_locale = g_getenv("LC_CTYPE");
1504         if (!cur_locale) cur_locale = g_getenv("LANG");
1505         if (!cur_locale) cur_locale = setlocale(LC_CTYPE, NULL);
1506 #endif /* G_OS_WIN32 */
1507
1508         debug_print("current locale: %s\n",
1509                     cur_locale ? cur_locale : "(none)");
1510
1511         return cur_locale;
1512 }
1513
1514 static gboolean conv_is_ja_locale(void)
1515 {
1516         static gint is_ja_locale = -1;
1517         const gchar *cur_locale;
1518
1519         if (is_ja_locale != -1)
1520                 return is_ja_locale != 0;
1521
1522         is_ja_locale = 0;
1523         cur_locale = conv_get_current_locale();
1524         if (cur_locale) {
1525                 if (g_ascii_strncasecmp(cur_locale, "ja", 2) == 0)
1526                         is_ja_locale = 1;
1527         }
1528
1529         return is_ja_locale != 0;
1530 }
1531
1532 gchar *conv_unmime_header(const gchar *str, const gchar *default_encoding,
1533                            gboolean addr_field)
1534 {
1535         gchar buf[BUFFSIZE];
1536
1537         if (is_ascii_str(str))
1538                 return unmime_header(str, addr_field);
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, addr_field);
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, addr_field);
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                 } else if (destp == (guchar *)dest && left < 7) {       \
1586                         if (is_plain_text && isspace(*srcp))            \
1587                                 srcp++;                                 \
1588                         if (*srcp) {                                    \
1589                                 *destp++ = '\n';                        \
1590                                 *destp++ = ' ';                         \
1591                                 left = MAX_LINELEN - 1;                 \
1592                         }                                               \
1593                 }                                                       \
1594         }                                                               \
1595 }
1596
1597 #define B64LEN(len) ((len) / 3 * 4 + ((len) % 3 ? 4 : 0))
1598
1599 void conv_encode_header_full(gchar *dest, gint len, const gchar *src,
1600                         gint header_len, gboolean addr_field,
1601                         const gchar *out_encoding_)
1602 {
1603         const gchar *cur_encoding;
1604         const gchar *out_encoding;
1605         gint mimestr_len;
1606         gchar *mimesep_enc;
1607         gint left;
1608         const guchar *srcp = src;
1609         guchar *destp = dest;
1610         gboolean use_base64;
1611
1612         cm_return_if_fail(g_utf8_validate(src, -1, NULL) == TRUE);
1613         cm_return_if_fail(destp != NULL);
1614
1615         if (MB_CUR_MAX > 1) {
1616                 use_base64 = TRUE;
1617                 mimesep_enc = "?B?";
1618         } else {
1619                 use_base64 = FALSE;
1620                 mimesep_enc = "?Q?";
1621         }
1622
1623         cur_encoding = CS_INTERNAL;
1624
1625         if (out_encoding_)
1626                 out_encoding = out_encoding_;
1627         else
1628                 out_encoding = conv_get_outgoing_charset_str();
1629
1630         if (!strcmp(out_encoding, CS_US_ASCII))
1631                 out_encoding = CS_ISO_8859_1;
1632
1633         mimestr_len = strlen(MIMESEP_BEGIN) + strlen(out_encoding) +
1634                 strlen(mimesep_enc) + strlen(MIMESEP_END);
1635
1636         left = MAX_LINELEN - header_len;
1637
1638         while (*srcp) {
1639                 LBREAK_IF_REQUIRED(left <= 0, TRUE);
1640
1641                 while (isspace(*srcp)) {
1642                         *destp++ = *srcp++;
1643                         left--;
1644                         LBREAK_IF_REQUIRED(left <= 0, TRUE);
1645                 }
1646
1647                 /* output as it is if the next word is ASCII string */
1648                 if (!is_next_nonascii(srcp)) {
1649                         gint word_len;
1650
1651                         word_len = get_next_word_len(srcp);
1652                         LBREAK_IF_REQUIRED(left < word_len, TRUE);
1653                         while (word_len > 0) {
1654                                 LBREAK_IF_REQUIRED(left + (MAX_HARD_LINELEN - MAX_LINELEN) <= 0, TRUE)
1655                                 *destp++ = *srcp++;
1656                                 left--;
1657                                 word_len--;
1658                         }
1659
1660                         continue;
1661                 }
1662
1663                 /* don't include parentheses and quotes in encoded strings */
1664                 if (addr_field && (*srcp == '(' || *srcp == ')' || *srcp == '"')) {
1665                         LBREAK_IF_REQUIRED(left < 2, FALSE);
1666                         *destp++ = *srcp++;
1667                         left--;
1668                 }
1669
1670                 while (1) {
1671                         gint mb_len = 0;
1672                         gint cur_len = 0;
1673                         gchar *part_str;
1674                         gchar *out_str;
1675                         gchar *enc_str;
1676                         const guchar *p = srcp;
1677                         gint out_str_len;
1678                         gint out_enc_str_len;
1679                         gint mime_block_len;
1680                         gboolean cont = FALSE;
1681
1682                         while (*p != '\0') {
1683                                 if (isspace(*p) && !is_next_nonascii(p + 1))
1684                                         break;
1685                                 /* don't include parentheses in encoded
1686                                    strings */
1687                                 if (addr_field && (*p == '(' || *p == ')' || *p == '"'))
1688                                         break;
1689
1690                                 mb_len = g_utf8_skip[*p];
1691
1692                                 Xstrndup_a(part_str, srcp, cur_len + mb_len, );
1693                                 out_str = conv_codeset_strdup
1694                                         (part_str, cur_encoding, out_encoding);
1695                                 if (!out_str) {
1696                                         if (strict_mode) {
1697                                                 *dest = '\0';
1698                                                 return;
1699                                         } else {
1700                                                 g_warning("conv_encode_header_full(): code conversion failed");
1701                                                 conv_unreadable_8bit(part_str);
1702                                                 out_str = g_strdup(part_str);
1703                                         }
1704                                 }
1705                                 out_str_len = strlen(out_str);
1706
1707                                 if (use_base64)
1708                                         out_enc_str_len = B64LEN(out_str_len);
1709                                 else
1710                                         out_enc_str_len =
1711                                                 qp_get_q_encoding_len(out_str);
1712
1713                                 g_free(out_str);
1714
1715                                 if (mimestr_len + out_enc_str_len <= left) {
1716                                         cur_len += mb_len;
1717                                         p += mb_len;
1718                                 } else if (cur_len == 0) {
1719                                         left = 0;
1720                                         LBREAK_IF_REQUIRED(1, FALSE);
1721                                         continue;
1722                                 } else {
1723                                         cont = TRUE;
1724                                         break;
1725                                 }
1726                         }
1727
1728                         if (cur_len > 0) {
1729                                 Xstrndup_a(part_str, srcp, cur_len, );
1730                                 out_str = conv_codeset_strdup
1731                                         (part_str, cur_encoding, out_encoding);
1732                                 if (!out_str) {
1733                                         g_warning("conv_encode_header_full(): code conversion failed");
1734                                         conv_unreadable_8bit(part_str);
1735                                         out_str = g_strdup(part_str);
1736                                 }
1737                                 out_str_len = strlen(out_str);
1738
1739                                 if (use_base64)
1740                                         out_enc_str_len = B64LEN(out_str_len);
1741                                 else
1742                                         out_enc_str_len =
1743                                                 qp_get_q_encoding_len(out_str);
1744
1745                                 if (use_base64)
1746                                         enc_str = g_base64_encode(out_str, out_str_len);
1747                                 else {
1748                                         Xalloca(enc_str, out_enc_str_len + 1, );
1749                                         qp_q_encode(enc_str, out_str);
1750                                 }
1751
1752                                 g_free(out_str);
1753
1754                                 /* output MIME-encoded string block */
1755                                 mime_block_len = mimestr_len + strlen(enc_str);
1756                                 g_snprintf(destp, mime_block_len + 1,
1757                                            MIMESEP_BEGIN "%s%s%s" MIMESEP_END,
1758                                            out_encoding, mimesep_enc, enc_str);
1759
1760                                 if (use_base64)
1761                                         g_free(enc_str);
1762
1763                                 destp += mime_block_len;
1764                                 srcp += cur_len;
1765
1766                                 left -= mime_block_len;
1767                         }
1768
1769                         LBREAK_IF_REQUIRED(cont, FALSE);
1770
1771                         if (cur_len == 0)
1772                                 break;
1773                 }
1774         }
1775
1776         *destp = '\0';
1777 }
1778
1779 void conv_encode_header(gchar *dest, gint len, const gchar *src,
1780                         gint header_len, gboolean addr_field)
1781 {
1782         conv_encode_header_full(dest,len,src,header_len,addr_field,NULL);
1783 }
1784
1785 #undef LBREAK_IF_REQUIRED
1786 #undef B64LEN
1787
1788 gchar *conv_filename_from_utf8(const gchar *utf8_file)
1789 {
1790         gchar *fs_file;
1791         GError *error = NULL;
1792
1793         fs_file = g_filename_from_utf8(utf8_file, -1, NULL, NULL, &error);
1794         if (error) {
1795                 debug_print("failed to convert encoding of file name: %s\n",
1796                           error->message);
1797                 g_error_free(error);
1798         }
1799         if (!fs_file)
1800                 fs_file = g_strdup(utf8_file);
1801
1802         return fs_file;
1803 }
1804
1805 gchar *conv_filename_to_utf8(const gchar *fs_file)
1806 {
1807         gchar *utf8_file = NULL;
1808         GError *error = NULL;
1809
1810         utf8_file = g_filename_to_utf8(fs_file, -1, NULL, NULL, &error);
1811         if (error) {
1812                 g_warning("failed to convert encoding of file name: %s",
1813                           error->message);
1814                 g_error_free(error);
1815         }
1816
1817         if (!utf8_file || !g_utf8_validate(utf8_file, -1, NULL)) {
1818                 g_free(utf8_file);
1819                 utf8_file = g_strdup(fs_file);
1820                 conv_unreadable_8bit(utf8_file);
1821         }
1822
1823         return utf8_file;
1824 }