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r9998: starting content for maintainers file
[Samba.git] / source / lib / iconv.c
blobd58165fed03271457f6ec31de9796215ce891d47
1 /*
2 Unix SMB/CIFS implementation.
3 minimal iconv implementation
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Jelmer Vernooij 2002,2003
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "includes.h"
23
24 /*
25 * We have to use strcasecmp here as the character conversions
26 * haven't been initialised yet. JRA.
27 */
28
29 #undef strcasecmp
30
31 /**
32 * @file
33 *
34 * @brief Samba wrapper/stub for iconv character set conversion.
35 *
36 * iconv is the XPG2 interface for converting between character
37 * encodings. This file provides a Samba wrapper around it, and also
38 * a simple reimplementation that is used if the system does not
39 * implement iconv.
40 *
41 * Samba only works with encodings that are supersets of ASCII: ascii
42 * characters like whitespace can be tested for directly, multibyte
43 * sequences start with a byte with the high bit set, and strings are
44 * terminated by a nul byte.
45 *
46 * Note that the only function provided by iconv is conversion between
47 * characters. It doesn't directly support operations like
48 * uppercasing or comparison. We have to convert to UCS-2 and compare
49 * there.
50 *
51 * @sa Samba Developers Guide
52 **/
53
54 static size_t ascii_pull(void *,const char **, size_t *, char **, size_t *);
55 static size_t ascii_push(void *,const char **, size_t *, char **, size_t *);
56 static size_t latin1_push(void *,const char **, size_t *, char **, size_t *);
57 static size_t utf8_pull(void *,const char **, size_t *, char **, size_t *);
58 static size_t utf8_push(void *,const char **, size_t *, char **, size_t *);
59 static size_t ucs2hex_pull(void *,const char **, size_t *, char **, size_t *);
60 static size_t ucs2hex_push(void *,const char **, size_t *, char **, size_t *);
61 static size_t iconv_copy(void *,const char **, size_t *, char **, size_t *);
62 static size_t iconv_swab (void *,const char **, size_t *, char **, size_t *);
63
64 static struct charset_functions builtin_functions[] = {
65 /* windows is really neither UCS-2 not UTF-16 */
66 {"UCS-2LE", iconv_copy, iconv_copy},
67 {"UTF-16LE", iconv_copy, iconv_copy},
68 {"UCS-2BE", iconv_swab, iconv_swab},
69 {"UTF-16BE", iconv_swab, iconv_swab},
70
71 /* we include the UTF-8 alias to cope with differing locale settings */
72 {"UTF8", utf8_pull, utf8_push},
73 {"UTF-8", utf8_pull, utf8_push},
74 {"ASCII", ascii_pull, ascii_push},
75 {"646", ascii_pull, ascii_push},
76 {"ISO-8859-1", ascii_pull, latin1_push},
77 {"UCS2-HEX", ucs2hex_pull, ucs2hex_push},
78 {NULL, NULL, NULL}
79 };
80
81 static struct charset_functions *charsets = NULL;
82
83 static struct charset_functions *find_charset_functions(const char *name)
84 {
85 struct charset_functions *c = charsets;
86
87 while(c) {
88 if (strcasecmp(name, c->name) == 0) {
89 return c;
90 }
91 c = c->next;
92 }
93
94 return NULL;
95 }
96
97 NTSTATUS smb_register_charset(struct charset_functions *funcs)
98 {
99 if (!funcs) {
100 return NT_STATUS_INVALID_PARAMETER;
101 }
102
103 DEBUG(5, ("Attempting to register new charset %s\n", funcs->name));
104 /* Check whether we already have this charset... */
105 if (find_charset_functions(funcs->name)) {
106 DEBUG(0, ("Duplicate charset %s, not registering\n", funcs->name));
107 return NT_STATUS_OBJECT_NAME_COLLISION;
108 }
109
110 funcs->next = funcs->prev = NULL;
111 DEBUG(5, ("Registered charset %s\n", funcs->name));
112 DLIST_ADD(charsets, funcs);
113 return NT_STATUS_OK;
114 }
115
116 static void lazy_initialize_iconv(void)
117 {
118 static BOOL initialized;
119 int i;
120
121 if (!initialized) {
122 initialized = True;
123 for(i = 0; builtin_functions[i].name; i++)
124 smb_register_charset(&builtin_functions[i]);
125 static_init_charset;
126 }
127 }
128
129 /* if there was an error then reset the internal state,
130 this ensures that we don't have a shift state remaining for
131 character sets like SJIS */
132 static size_t sys_iconv(void *cd,
133 const char **inbuf, size_t *inbytesleft,
134 char **outbuf, size_t *outbytesleft)
135 {
136 #ifdef HAVE_NATIVE_ICONV
137 size_t ret = iconv((iconv_t)cd,
138 (char **)inbuf, inbytesleft,
139 outbuf, outbytesleft);
140 if (ret == (size_t)-1) {
141 int saved_errno = errno;
142 iconv(cd, NULL, NULL, NULL, NULL);
143 errno = saved_errno;
144 }
145 return ret;
146 #else
147 errno = EINVAL;
148 return -1;
149 #endif
150 }
151
152 /**
153 * This is a simple portable iconv() implementaion.
154 *
155 * It only knows about a very small number of character sets - just
156 * enough that Samba works on systems that don't have iconv.
157 **/
158 size_t smb_iconv(smb_iconv_t cd,
159 const char **inbuf, size_t *inbytesleft,
160 char **outbuf, size_t *outbytesleft)
161 {
162 char cvtbuf[2048];
163 char *bufp = cvtbuf;
164 size_t bufsize;
165
166 /* in many cases we can go direct */
167 if (cd->direct) {
168 return cd->direct(cd->cd_direct,
169 inbuf, inbytesleft, outbuf, outbytesleft);
170 }
171
172
173 /* otherwise we have to do it chunks at a time */
174 while (*inbytesleft > 0) {
175 bufp = cvtbuf;
176 bufsize = sizeof(cvtbuf);
177
178 if (cd->pull(cd->cd_pull,
179 inbuf, inbytesleft, &bufp, &bufsize) == -1
180 && errno != E2BIG) return -1;
181
182 bufp = cvtbuf;
183 bufsize = sizeof(cvtbuf) - bufsize;
184
185 if (cd->push(cd->cd_push,
186 (const char **)&bufp, &bufsize,
187 outbuf, outbytesleft) == -1) return -1;
188 }
189
190 return 0;
191 }
192
193
194 static BOOL is_utf16(const char *name)
195 {
196 return strcasecmp(name, "UCS-2LE") == 0 ||
197 strcasecmp(name, "UTF-16LE") == 0;
198 }
199
200 /*
201 simple iconv_open() wrapper
202 */
203 smb_iconv_t smb_iconv_open(const char *tocode, const char *fromcode)
204 {
205 smb_iconv_t ret;
206 struct charset_functions *from, *to;
207
208 lazy_initialize_iconv();
209 from = charsets;
210 to = charsets;
211
212 ret = SMB_MALLOC_P(struct _smb_iconv_t);
213 if (!ret) {
214 errno = ENOMEM;
215 return (smb_iconv_t)-1;
216 }
217 memset(ret, 0, sizeof(struct _smb_iconv_t));
218
219 ret->from_name = SMB_STRDUP(fromcode);
220 ret->to_name = SMB_STRDUP(tocode);
221
222 /* check for the simplest null conversion */
223 if (strcasecmp(fromcode, tocode) == 0) {
224 ret->direct = iconv_copy;
225 return ret;
226 }
227
228 /* check if we have a builtin function for this conversion */
229 from = find_charset_functions(fromcode);
230 if(from)ret->pull = from->pull;
231
232 to = find_charset_functions(tocode);
233 if(to)ret->push = to->push;
234
235 /* check if we can use iconv for this conversion */
236 #ifdef HAVE_NATIVE_ICONV
237 if (!ret->pull) {
238 ret->cd_pull = iconv_open("UTF-16LE", fromcode);
239 if (ret->cd_pull == (iconv_t)-1)
240 ret->cd_pull = iconv_open("UCS-2LE", fromcode);
241 if (ret->cd_pull != (iconv_t)-1)
242 ret->pull = sys_iconv;
243 }
244
245 if (!ret->push) {
246 ret->cd_push = iconv_open(tocode, "UTF-16LE");
247 if (ret->cd_push == (iconv_t)-1)
248 ret->cd_push = iconv_open(tocode, "UCS-2LE");
249 if (ret->cd_push != (iconv_t)-1)
250 ret->push = sys_iconv;
251 }
252 #endif
253
254 /* check if there is a module available that can do this conversion */
255 if (!ret->pull && NT_STATUS_IS_OK(smb_probe_module("charset", fromcode))) {
256 if(!(from = find_charset_functions(fromcode)))
257 DEBUG(0, ("Module %s doesn't provide charset %s!\n", fromcode, fromcode));
258 else
259 ret->pull = from->pull;
260 }
261
262 if (!ret->push && NT_STATUS_IS_OK(smb_probe_module("charset", tocode))) {
263 if(!(to = find_charset_functions(tocode)))
264 DEBUG(0, ("Module %s doesn't provide charset %s!\n", tocode, tocode));
265 else
266 ret->push = to->push;
267 }
268
269 if (!ret->push || !ret->pull) {
270 SAFE_FREE(ret->from_name);
271 SAFE_FREE(ret->to_name);
272 SAFE_FREE(ret);
273 errno = EINVAL;
274 return (smb_iconv_t)-1;
275 }
276
277 /* check for conversion to/from ucs2 */
278 if (is_utf16(fromcode) && to) {
279 ret->direct = to->push;
280 ret->push = ret->pull = NULL;
281 return ret;
282 }
283
284 if (is_utf16(tocode) && from) {
285 ret->direct = from->pull;
286 ret->push = ret->pull = NULL;
287 return ret;
288 }
289
290 /* Check if we can do the conversion direct */
291 #ifdef HAVE_NATIVE_ICONV
292 if (is_utf16(fromcode)) {
293 ret->direct = sys_iconv;
294 ret->cd_direct = ret->cd_push;
295 ret->cd_push = NULL;
296 return ret;
297 }
298 if (is_utf16(tocode)) {
299 ret->direct = sys_iconv;
300 ret->cd_direct = ret->cd_pull;
301 ret->cd_pull = NULL;
302 return ret;
303 }
304 #endif
305
306 return ret;
307 }
308
309 /*
310 simple iconv_close() wrapper
311 */
312 int smb_iconv_close (smb_iconv_t cd)
313 {
314 #ifdef HAVE_NATIVE_ICONV
315 if (cd->cd_direct) iconv_close((iconv_t)cd->cd_direct);
316 if (cd->cd_pull) iconv_close((iconv_t)cd->cd_pull);
317 if (cd->cd_push) iconv_close((iconv_t)cd->cd_push);
318 #endif
319
320 SAFE_FREE(cd->from_name);
321 SAFE_FREE(cd->to_name);
322
323 memset(cd, 0, sizeof(*cd));
324 SAFE_FREE(cd);
325 return 0;
326 }
327
328
329 /**********************************************************************
330 the following functions implement the builtin character sets in Samba
331 and also the "test" character sets that are designed to test
332 multi-byte character set support for english users
333 ***********************************************************************/
334
335 static size_t ascii_pull(void *cd, const char **inbuf, size_t *inbytesleft,
336 char **outbuf, size_t *outbytesleft)
337 {
338 while (*inbytesleft >= 1 && *outbytesleft >= 2) {
339 (*outbuf)[0] = (*inbuf)[0];
340 (*outbuf)[1] = 0;
341 (*inbytesleft) -= 1;
342 (*outbytesleft) -= 2;
343 (*inbuf) += 1;
344 (*outbuf) += 2;
345 }
346
347 if (*inbytesleft > 0) {
348 errno = E2BIG;
349 return -1;
350 }
351
352 return 0;
353 }
354
355 static size_t ascii_push(void *cd, const char **inbuf, size_t *inbytesleft,
356 char **outbuf, size_t *outbytesleft)
357 {
358 int ir_count=0;
359
360 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
361 (*outbuf)[0] = (*inbuf)[0] & 0x7F;
362 if ((*inbuf)[1]) ir_count++;
363 (*inbytesleft) -= 2;
364 (*outbytesleft) -= 1;
365 (*inbuf) += 2;
366 (*outbuf) += 1;
367 }
368
369 if (*inbytesleft == 1) {
370 errno = EINVAL;
371 return -1;
372 }
373
374 if (*inbytesleft > 1) {
375 errno = E2BIG;
376 return -1;
377 }
378
379 return ir_count;
380 }
381
382 static size_t latin1_push(void *cd, const char **inbuf, size_t *inbytesleft,
383 char **outbuf, size_t *outbytesleft)
384 {
385 int ir_count=0;
386
387 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
388 (*outbuf)[0] = (*inbuf)[0];
389 if ((*inbuf)[1]) ir_count++;
390 (*inbytesleft) -= 2;
391 (*outbytesleft) -= 1;
392 (*inbuf) += 2;
393 (*outbuf) += 1;
394 }
395
396 if (*inbytesleft == 1) {
397 errno = EINVAL;
398 return -1;
399 }
400
401 if (*inbytesleft > 1) {
402 errno = E2BIG;
403 return -1;
404 }
405
406 return ir_count;
407 }
408
409 static size_t ucs2hex_pull(void *cd, const char **inbuf, size_t *inbytesleft,
410 char **outbuf, size_t *outbytesleft)
411 {
412 while (*inbytesleft >= 1 && *outbytesleft >= 2) {
413 unsigned v;
414
415 if ((*inbuf)[0] != '@') {
416 /* seven bit ascii case */
417 (*outbuf)[0] = (*inbuf)[0];
418 (*outbuf)[1] = 0;
419 (*inbytesleft) -= 1;
420 (*outbytesleft) -= 2;
421 (*inbuf) += 1;
422 (*outbuf) += 2;
423 continue;
424 }
425 /* it's a hex character */
426 if (*inbytesleft < 5) {
427 errno = EINVAL;
428 return -1;
429 }
430
431 if (sscanf(&(*inbuf)[1], "%04x", &v) != 1) {
432 errno = EILSEQ;
433 return -1;
434 }
435
436 (*outbuf)[0] = v&0xff;
437 (*outbuf)[1] = v>>8;
438 (*inbytesleft) -= 5;
439 (*outbytesleft) -= 2;
440 (*inbuf) += 5;
441 (*outbuf) += 2;
442 }
443
444 if (*inbytesleft > 0) {
445 errno = E2BIG;
446 return -1;
447 }
448
449 return 0;
450 }
451
452 static size_t ucs2hex_push(void *cd, const char **inbuf, size_t *inbytesleft,
453 char **outbuf, size_t *outbytesleft)
454 {
455 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
456 char buf[6];
457
458 if ((*inbuf)[1] == 0 &&
459 ((*inbuf)[0] & 0x80) == 0 &&
460 (*inbuf)[0] != '@') {
461 (*outbuf)[0] = (*inbuf)[0];
462 (*inbytesleft) -= 2;
463 (*outbytesleft) -= 1;
464 (*inbuf) += 2;
465 (*outbuf) += 1;
466 continue;
467 }
468 if (*outbytesleft < 5) {
469 errno = E2BIG;
470 return -1;
471 }
472 snprintf(buf, 6, "@%04x", SVAL(*inbuf, 0));
473 memcpy(*outbuf, buf, 5);
474 (*inbytesleft) -= 2;
475 (*outbytesleft) -= 5;
476 (*inbuf) += 2;
477 (*outbuf) += 5;
478 }
479
480 if (*inbytesleft == 1) {
481 errno = EINVAL;
482 return -1;
483 }
484
485 if (*inbytesleft > 1) {
486 errno = E2BIG;
487 return -1;
488 }
489
490 return 0;
491 }
492
493 static size_t iconv_swab(void *cd, const char **inbuf, size_t *inbytesleft,
494 char **outbuf, size_t *outbytesleft)
495 {
496 int n;
497
498 n = MIN(*inbytesleft, *outbytesleft);
499
500 swab(*inbuf, *outbuf, (n&~1));
501 if (n&1) {
502 (*outbuf)[n-1] = 0;
503 }
504
505 (*inbytesleft) -= n;
506 (*outbytesleft) -= n;
507 (*inbuf) += n;
508 (*outbuf) += n;
509
510 if (*inbytesleft > 0) {
511 errno = E2BIG;
512 return -1;
513 }
514
515 return 0;
516 }
517
518 static size_t iconv_copy(void *cd, const char **inbuf, size_t *inbytesleft,
519 char **outbuf, size_t *outbytesleft)
520 {
521 int n;
522
523 n = MIN(*inbytesleft, *outbytesleft);
524
525 memmove(*outbuf, *inbuf, n);
526
527 (*inbytesleft) -= n;
528 (*outbytesleft) -= n;
529 (*inbuf) += n;
530 (*outbuf) += n;
531
532 if (*inbytesleft > 0) {
533 errno = E2BIG;
534 return -1;
535 }
536
537 return 0;
538 }
539
540 static size_t utf8_pull(void *cd, const char **inbuf, size_t *inbytesleft,
541 char **outbuf, size_t *outbytesleft)
542 {
543 size_t in_left=*inbytesleft, out_left=*outbytesleft;
544 const uint8 *c = (const uint8 *)*inbuf;
545 uint8 *uc = (uint8 *)*outbuf;
546
547 while (in_left >= 1 && out_left >= 2) {
548 if ((c[0] & 0x80) == 0) {
549 uc[0] = c[0];
550 uc[1] = 0;
551 c += 1;
552 in_left -= 1;
553 out_left -= 2;
554 uc += 2;
555 continue;
556 }
557
558 if ((c[0] & 0xe0) == 0xc0) {
559 if (in_left < 2 ||
560 (c[1] & 0xc0) != 0x80) {
561 errno = EILSEQ;
562 goto error;
563 }
564 uc[1] = (c[0]>>2) & 0x7;
565 uc[0] = (c[0]<<6) | (c[1]&0x3f);
566 c += 2;
567 in_left -= 2;
568 out_left -= 2;
569 uc += 2;
570 continue;
571 }
572
573 if ((c[0] & 0xf0) == 0xe0) {
574 if (in_left < 3 ||
575 (c[1] & 0xc0) != 0x80 ||
576 (c[2] & 0xc0) != 0x80) {
577 errno = EILSEQ;
578 goto error;
579 }
580 uc[1] = ((c[0]&0xF)<<4) | ((c[1]>>2)&0xF);
581 uc[0] = (c[1]<<6) | (c[2]&0x3f);
582 c += 3;
583 in_left -= 3;
584 out_left -= 2;
585 uc += 2;
586 continue;
587 }
588
589 if ((c[0] & 0xf8) == 0xf0) {
590 unsigned int codepoint;
591 if (in_left < 4 ||
592 (c[1] & 0xc0) != 0x80 ||
593 (c[2] & 0xc0) != 0x80 ||
594 (c[3] & 0xc0) != 0x80) {
595 errno = EILSEQ;
596 goto error;
597 }
598 codepoint =
599 (c[3]&0x3f) |
600 ((c[2]&0x3f)<<6) |
601 ((c[1]&0x3f)<<12) |
602 ((c[0]&0x7)<<18);
603 if (codepoint < 0x10000) {
604 /* accept UTF-8 characters that are not
605 minimally packed, but pack the result */
606 uc[0] = (codepoint & 0xFF);
607 uc[1] = (codepoint >> 8);
608 c += 4;
609 in_left -= 4;
610 out_left -= 2;
611 uc += 2;
612 continue;
613 }
614
615 codepoint -= 0x10000;
616
617 if (out_left < 4) {
618 errno = E2BIG;
619 goto error;
620 }
621
622 uc[0] = (codepoint>>10) & 0xFF;
623 uc[1] = (codepoint>>18) | 0xd8;
624 uc[2] = codepoint & 0xFF;
625 uc[3] = ((codepoint>>8) & 0x3) | 0xdc;
626 c += 4;
627 in_left -= 4;
628 out_left -= 4;
629 uc += 4;
630 continue;
631 }
632
633 /* we don't handle 5 byte sequences */
634 errno = EINVAL;
635 goto error;
636 }
637
638 if (in_left > 0) {
639 errno = E2BIG;
640 goto error;
641 }
642
643 *inbytesleft = in_left;
644 *outbytesleft = out_left;
645 *inbuf = c;
646 *outbuf = uc;
647 return 0;
648
649 error:
650 *inbytesleft = in_left;
651 *outbytesleft = out_left;
652 *inbuf = c;
653 *outbuf = uc;
654 return -1;
655 }
656
657 static size_t utf8_push(void *cd, const char **inbuf, size_t *inbytesleft,
658 char **outbuf, size_t *outbytesleft)
659 {
660 size_t in_left=*inbytesleft, out_left=*outbytesleft;
661 uint8 *c = (uint8 *)*outbuf;
662 const uint8 *uc = (const uint8 *)*inbuf;
663
664 while (in_left >= 2 && out_left >= 1) {
665 unsigned int codepoint;
666
667 if (uc[1] == 0 && !(uc[0] & 0x80)) {
668 /* simplest case */
669 c[0] = uc[0];
670 in_left -= 2;
671 out_left -= 1;
672 uc += 2;
673 c += 1;
674 continue;
675 }
676
677 if ((uc[1]&0xf8) == 0) {
678 /* next simplest case */
679 if (out_left < 2) {
680 errno = E2BIG;
681 goto error;
682 }
683 c[0] = 0xc0 | (uc[0]>>6) | (uc[1]<<2);
684 c[1] = 0x80 | (uc[0] & 0x3f);
685 in_left -= 2;
686 out_left -= 2;
687 uc += 2;
688 c += 2;
689 continue;
690 }
691
692 if ((uc[1] & 0xfc) == 0xdc) {
693 /* its the second part of a 4 byte sequence. Illegal */
694 if (in_left < 4) {
695 errno = EINVAL;
696 } else {
697 errno = EILSEQ;
698 }
699 goto error;
700 }
701
702 if ((uc[1] & 0xfc) != 0xd8) {
703 codepoint = uc[0] | (uc[1]<<8);
704 if (out_left < 3) {
705 errno = E2BIG;
706 goto error;
707 }
708 c[0] = 0xe0 | (codepoint >> 12);
709 c[1] = 0x80 | ((codepoint >> 6) & 0x3f);
710 c[2] = 0x80 | (codepoint & 0x3f);
711
712 in_left -= 2;
713 out_left -= 3;
714 uc += 2;
715 c += 3;
716 continue;
717 }
718
719 /* its the first part of a 4 byte sequence */
720 if (in_left < 4) {
721 errno = EINVAL;
722 goto error;
723 }
724 if ((uc[3] & 0xfc) != 0xdc) {
725 errno = EILSEQ;
726 goto error;
727 }
728 codepoint = 0x10000 + (uc[2] | ((uc[3] & 0x3)<<8) |
729 (uc[0]<<10) | ((uc[1] & 0x3)<<18));
730
731 if (out_left < 4) {
732 errno = E2BIG;
733 goto error;
734 }
735 c[0] = 0xf0 | (codepoint >> 18);
736 c[1] = 0x80 | ((codepoint >> 12) & 0x3f);
737 c[2] = 0x80 | ((codepoint >> 6) & 0x3f);
738 c[3] = 0x80 | (codepoint & 0x3f);
739
740 in_left -= 4;
741 out_left -= 4;
742 uc += 4;
743 c += 4;
744 }
745
746 if (in_left == 1) {
747 errno = EINVAL;
748 goto error;
749 }
750
751 if (in_left > 1) {
752 errno = E2BIG;
753 goto error;
754 }
755
756 *inbytesleft = in_left;
757 *outbytesleft = out_left;
758 *inbuf = uc;
759 *outbuf = c;
760
761 return 0;
762
763 error:
764 *inbytesleft = in_left;
765 *outbytesleft = out_left;
766 *inbuf = uc;
767 *outbuf = c;
768 return -1;
769 }
770
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