2 Unix SMB/CIFS implementation.
3 Character set conversion Extensions
4 Copyright (C) Igor Vergeichik <iverg@mail.ru> 2001
5 Copyright (C) Andrew Tridgell 2001-2011
6 Copyright (C) Andrew Bartlett 2011
7 Copyright (C) Simo Sorce 2001
8 Copyright (C) Martin Pool 2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/iconv.h"
27 #include "lib/util/debug.h"
28 #include "lib/util/fault.h"
33 * @brief Character-set conversion routines built on our iconv.
35 * @note Samba's internal character set (at least in the 3.0 series)
36 * is always the same as the one for the Unix filesystem. It is
37 * <b>not</b> necessarily UTF-8 and may be different on machines that
38 * need i18n filenames to be compatible with Unix software. It does
39 * have to be a superset of ASCII. All multibyte sequences must start
40 * with a byte with the high bit set.
47 * Convert string from one encoding to another, making error checking etc
48 * Slow path version - uses (slow) iconv.
50 * @param src pointer to source string (multibyte or singlebyte)
51 * @param srclen length of the source string in bytes
52 * @param dest pointer to destination string (multibyte or singlebyte)
53 * @param destlen maximal length allowed for string
54 * @param converted size is the number of bytes occupied in the destination
56 * @returns false and sets errno on fail, true on success.
58 * Ensure the srclen contains the terminating zero.
62 static bool convert_string_internal(struct smb_iconv_handle *ic,
63 charset_t from, charset_t to,
64 void const *src, size_t srclen,
65 void *dest, size_t destlen, size_t *converted_size)
69 const char* inbuf = (const char*)src;
70 char* outbuf = (char*)dest;
71 smb_iconv_t descriptor;
73 descriptor = get_conv_handle(ic, from, to);
75 if (srclen == (size_t)-1) {
76 if (from == CH_UTF16LE || from == CH_UTF16BE) {
77 srclen = (strlen_w((const smb_ucs2_t *)src)+1) * 2;
79 srclen = strlen((const char *)src)+1;
84 if (descriptor == (smb_iconv_t)-1 || descriptor == (smb_iconv_t)0) {
92 retval = smb_iconv(descriptor, &inbuf, &i_len, &outbuf, &o_len);
93 *converted_size = destlen-o_len;
95 return (retval != (size_t)-1);
99 * Convert string from one encoding to another, making error checking etc
100 * Fast path version - handles ASCII first.
102 * @param src pointer to source string (multibyte or singlebyte)
103 * @param srclen length of the source string in bytes, or -1 for nul terminated.
104 * @param dest pointer to destination string (multibyte or singlebyte)
105 * @param destlen maximal length allowed for string - *NEVER* -1.
106 * @param converted size is the number of bytes occupied in the destination
108 * @returns false and sets errno on fail, true on success.
110 * Ensure the srclen contains the terminating zero.
112 * This function has been hand-tuned to provide a fast path.
113 * Don't change unless you really know what you are doing. JRA.
116 bool convert_string_error_handle(struct smb_iconv_handle *ic,
117 charset_t from, charset_t to,
118 void const *src, size_t srclen,
119 void *dest, size_t destlen,
120 size_t *converted_size)
123 * NB. We deliberately don't do a strlen here if srclen == -1.
124 * This is very expensive over millions of calls and is taken
125 * care of in the slow path in convert_string_internal. JRA.
129 SMB_ASSERT(destlen != (size_t)-1);
137 if (from != CH_UTF16LE && from != CH_UTF16BE && to != CH_UTF16LE && to != CH_UTF16BE) {
138 const unsigned char *p = (const unsigned char *)src;
139 unsigned char *q = (unsigned char *)dest;
140 size_t slen = srclen;
141 size_t dlen = destlen;
142 unsigned char lastp = '\0';
145 /* If all characters are ascii, fast path here. */
146 while (slen && dlen) {
147 if ((lastp = *p) <= 0x7f) {
149 if (slen != (size_t)-1) {
157 #ifdef BROKEN_UNICODE_COMPOSE_CHARACTERS
160 bool ret = convert_string_internal(ic, from, to, p, slen, q, dlen, converted_size);
161 *converted_size += retval;
167 *converted_size = retval;
170 /* Even if we fast path we should note if we ran out of room. */
171 if (((slen != (size_t)-1) && slen) ||
172 ((slen == (size_t)-1) && lastp)) {
178 } else if (from == CH_UTF16LE && to != CH_UTF16LE) {
179 const unsigned char *p = (const unsigned char *)src;
180 unsigned char *q = (unsigned char *)dest;
182 size_t slen = srclen;
183 size_t dlen = destlen;
184 unsigned char lastp = '\0';
185 #ifndef BROKEN_UNICODE_COMPOSE_CHARACTERS
189 if (slen == (size_t)-1) {
191 ((lastp = *p) <= 0x7f) && (p[1] == 0)) {
199 if (lastp != 0) goto slow_path;
201 while (slen >= 2 && dlen &&
202 (*p <= 0x7f) && (p[1] == 0)) {
209 if (slen != 0) goto slow_path;
212 *converted_size = retval;
215 /* Even if we fast path we should note if we ran out of room. */
216 if (((slen != (size_t)-1) && slen) ||
217 ((slen == (size_t)-1) && lastp)) {
225 /* come here when we hit a character we can't deal
226 * with in the fast path
228 #ifdef BROKEN_UNICODE_COMPOSE_CHARACTERS
231 ret = convert_string_internal(ic, from, to, p, slen, q, dlen, converted_size);
232 *converted_size += retval;
236 } else if (from != CH_UTF16LE && from != CH_UTF16BE && to == CH_UTF16LE) {
237 const unsigned char *p = (const unsigned char *)src;
238 unsigned char *q = (unsigned char *)dest;
240 size_t slen = srclen;
241 size_t dlen = destlen;
242 unsigned char lastp = '\0';
244 /* If all characters are ascii, fast path here. */
245 while (slen && (dlen >= 1)) {
246 if (dlen >=2 && (lastp = *p) <= 0x7F) {
249 if (slen != (size_t)-1) {
257 #ifdef BROKEN_UNICODE_COMPOSE_CHARACTERS
260 bool ret = convert_string_internal(ic, from, to, p, slen, q, dlen, converted_size);
261 *converted_size += retval;
267 *converted_size = retval;
270 /* Even if we fast path we should note if we ran out of room. */
271 if (((slen != (size_t)-1) && slen) ||
272 ((slen == (size_t)-1) && lastp)) {
280 #ifdef BROKEN_UNICODE_COMPOSE_CHARACTERS
283 return convert_string_internal(ic, from, to, src, srclen, dest, destlen, converted_size);
286 bool convert_string_handle(struct smb_iconv_handle *ic,
287 charset_t from, charset_t to,
288 void const *src, size_t srclen,
289 void *dest, size_t destlen,
290 size_t *converted_size)
292 bool ret = convert_string_error_handle(ic, from, to, src, srclen, dest, destlen, converted_size);
295 const char *reason="unknown error";
298 reason="Incomplete multibyte sequence";
299 DBG_NOTICE("Conversion error: %s\n",
304 reason="No more room";
305 if (from == CH_UNIX) {
306 DBG_NOTICE("E2BIG: convert_string(%s,%s): srclen=%u destlen=%u error: %s\n",
307 charset_name(ic, from), charset_name(ic, to),
308 (unsigned int)srclen, (unsigned int)destlen, reason);
310 DBG_NOTICE("E2BIG: convert_string(%s,%s): srclen=%u destlen=%u error: %s\n",
311 charset_name(ic, from), charset_name(ic, to),
312 (unsigned int)srclen, (unsigned int)destlen, reason);
317 reason="Illegal multibyte sequence";
318 DBG_NOTICE("convert_string_internal: Conversion error: %s\n",
322 DBG_ERR("convert_string_internal: Conversion error: %s\n",
326 /* smb_panic(reason); */
333 * Convert between character sets, allocating a new buffer using talloc for the result.
335 * @param srclen length of source buffer.
336 * @param dest always set at least to NULL
337 * @param converted_size set to the number of bytes occupied by the string in
338 * the destination on success.
339 * @note -1 is not accepted for srclen.
341 * @return true if new buffer was correctly allocated, and string was
344 * Ensure the srclen contains the terminating zero.
346 * I hate the goto's in this function. It's emberrassing.....
347 * There has to be a cleaner way to do this. JRA.
349 bool convert_string_talloc_handle(TALLOC_CTX *ctx, struct smb_iconv_handle *ic,
350 charset_t from, charset_t to,
351 void const *src, size_t srclen, void *dst,
352 size_t *converted_size)
355 size_t i_len, o_len, destlen;
357 const char *inbuf = NULL;
358 char *outbuf = NULL, *ob = NULL;
359 smb_iconv_t descriptor;
360 void **dest = (void **)dst;
363 if (converted_size != NULL) {
367 if (src == NULL || srclen == (size_t)-1) {
373 /* We really should treat this as an error, but
374 there are too many callers that need this to
375 return a NULL terminated string in the correct
377 if (to == CH_UTF16LE|| to == CH_UTF16BE || to == CH_UTF16MUNGED) {
382 ob = talloc_zero_array(ctx, char, destlen);
384 DBG_ERR("Could not talloc destination buffer.\n");
388 if (converted_size != NULL) {
389 *converted_size = destlen;
395 descriptor = get_conv_handle(ic, from, to);
397 if (descriptor == (smb_iconv_t)-1 || descriptor == (smb_iconv_t)0) {
398 DEBUG(0,("convert_string_talloc: Conversion not supported.\n"));
403 if (srclen >= (SIZE_MAX - 2) / 3) {
404 DBG_ERR("convert_string_talloc: "
405 "srclen is %zu, destlen would wrap!\n",
410 destlen = srclen * 3;
412 /* +2 is for ucs2 null termination. */
413 ob = talloc_realloc(ctx, ob, char, destlen + 2);
416 DEBUG(0, ("convert_string_talloc: realloc failed!\n"));
423 inbuf = (const char *)src;
425 retval = smb_iconv(descriptor,
428 if(retval == (size_t)-1) {
429 const char *reason="unknown error";
432 reason="Incomplete multibyte sequence";
433 DBG_NOTICE("Conversion error: %s\n",
437 reason = "output buffer is too small";
438 DBG_ERR("Conversion error: %s\n",
442 reason="Illegal multibyte sequence";
443 DBG_NOTICE("Conversion error: %s\n",
447 DBG_ERR("Conversion error: %s\n",
451 /* smb_panic(reason); */
456 destlen = destlen - o_len;
457 /* Don't shrink unless we're reclaiming a lot of
458 * space. This is in the hot codepath and these
459 * reallocs *cost*. JRA.
462 /* We're shrinking here so we know the +2 is safe from wrap. */
463 ob = talloc_realloc(ctx,ob, char, destlen + 2);
466 if (destlen && !ob) {
467 DEBUG(0, ("convert_string_talloc: out of memory!\n"));
474 /* Must ucs2 null terminate in the extra space we allocated. */
476 ob[destlen+1] = '\0';
478 /* Ensure we can never return a *converted_size of zero. */
480 /* As we're now returning false on a bad smb_iconv call,
481 this should never happen. But be safe anyway. */
482 if (to == CH_UTF16LE|| to == CH_UTF16BE || to == CH_UTF16MUNGED) {
489 if (converted_size != NULL) {
490 *converted_size = destlen;
496 * Convert string from one encoding to another, with error checking.
497 * This version produces more logging information than
498 * convert_string_error(), but is otherwise functionally identical.
500 * @param src pointer to source string (multibyte or singlebyte)
501 * @param srclen length of the source string in bytes
502 * @param dest pointer to destination string (multibyte or singlebyte)
503 * @param destlen maximal length allowed for string
504 * @param converted_size the number of bytes occupied in the destination
506 * @returns true on success, false on fail.
508 _PUBLIC_ bool convert_string(charset_t from, charset_t to,
509 void const *src, size_t srclen,
510 void *dest, size_t destlen,
511 size_t *converted_size)
513 return convert_string_handle(get_iconv_handle(), from, to,
515 dest, destlen, converted_size);
519 * Convert string from one encoding to another, with error checking.
520 * This version is less verbose than convert_string().
522 * @param src pointer to source string (multibyte or singlebyte)
523 * @param srclen length of the source string in bytes
524 * @param dest pointer to destination string (multibyte or singlebyte)
525 * @param destlen maximal length allowed for string
526 * @param converted_size the number of bytes occupied in the destination
528 * @returns true on success, false on fail.
530 _PUBLIC_ bool convert_string_error(charset_t from, charset_t to,
531 void const *src, size_t srclen,
532 void *dest, size_t destlen,
533 size_t *converted_size)
535 return convert_string_error_handle(get_iconv_handle(), from, to,
537 dest, destlen, converted_size);
541 * Convert between character sets, allocating a new buffer using talloc for the result.
543 * @param srclen length of source buffer.
544 * @param dest always set at least to NULL
545 * @param converted_size Size in bytes of the converted string
546 * @note -1 is not accepted for srclen.
548 * @returns boolean indication whether the conversion succeeded
551 _PUBLIC_ bool convert_string_talloc(TALLOC_CTX *ctx,
552 charset_t from, charset_t to,
553 void const *src, size_t srclen,
554 void *dest, size_t *converted_size)
556 return convert_string_talloc_handle(ctx, get_iconv_handle(),
557 from, to, src, srclen, dest,