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
6 Copyright (C) Simo Sorce 2001
7 Copyright (C) Jelmer Vernooij 2007
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "lib/util/charset/charset.h"
25 #include "system/locale.h"
26 #include "dynconfig.h"
34 * @brief Unicode string manipulation
37 /* these 2 tables define the unicode case handling. They are loaded
38 at startup either via mmap() or read() from the lib directory */
39 static void *upcase_table;
40 static void *lowcase_table;
43 /*******************************************************************
44 load the case handling tables
46 This is the function that should be called from library code.
47 ********************************************************************/
48 void load_case_tables_library(void)
52 mem_ctx = talloc_init("load_case_tables");
54 smb_panic("No memory for case_tables");
56 upcase_table = map_file(talloc_asprintf(mem_ctx, "%s/upcase.dat", get_dyn_CODEPAGEDIR()), 0x20000);
57 lowcase_table = map_file(talloc_asprintf(mem_ctx, "%s/lowcase.dat", get_dyn_CODEPAGEDIR()), 0x20000);
59 if (upcase_table == NULL) {
60 DEBUG(1, ("Failed to load upcase.dat, will use lame ASCII-only case sensitivity rules\n"));
61 upcase_table = (void *)-1;
63 if (lowcase_table == NULL) {
64 DEBUG(1, ("Failed to load lowcase.dat, will use lame ASCII-only case sensitivity rules\n"));
65 lowcase_table = (void *)-1;
69 /*******************************************************************
70 load the case handling tables
72 This MUST only be called from main() in application code, never from a
73 library. We don't know if the calling program has already done
74 setlocale() to another value, and can't tell if they have.
75 ********************************************************************/
76 void load_case_tables(void)
78 /* This is a useful global hook where we can ensure that the
79 * locale is set from the environment. This is needed so that
80 * we can use LOCALE as a codepage */
82 setlocale(LC_ALL, "");
84 load_case_tables_library();
88 Convert a codepoint_t to upper case.
90 _PUBLIC_ codepoint_t toupper_m(codepoint_t val)
95 if (upcase_table == NULL) {
96 load_case_tables_library();
98 if (upcase_table == (void *)-1) {
101 if (val & 0xFFFF0000) {
104 return SVAL(upcase_table, val*2);
108 Convert a codepoint_t to lower case.
110 _PUBLIC_ codepoint_t tolower_m(codepoint_t val)
115 if (lowcase_table == NULL) {
116 load_case_tables_library();
118 if (lowcase_table == (void *)-1) {
121 if (val & 0xFFFF0000) {
124 return SVAL(lowcase_table, val*2);
128 If we upper cased this character, would we get the same character?
130 _PUBLIC_ bool islower_m(codepoint_t val)
132 return (toupper_m(val) != val);
136 If we lower cased this character, would we get the same character?
138 _PUBLIC_ bool isupper_m(codepoint_t val)
140 return (tolower_m(val) != val);
144 compare two codepoints case insensitively
146 _PUBLIC_ int codepoint_cmpi(codepoint_t c1, codepoint_t c2)
149 toupper_m(c1) == toupper_m(c2)) {
156 struct smb_iconv_handle {
157 TALLOC_CTX *child_ctx;
158 const char *unix_charset;
159 const char *dos_charset;
160 const char *display_charset;
162 smb_iconv_t conv_handles[NUM_CHARSETS][NUM_CHARSETS];
165 struct smb_iconv_handle *global_iconv_handle = NULL;
167 struct smb_iconv_handle *get_iconv_handle(void)
169 if (global_iconv_handle == NULL)
170 global_iconv_handle = smb_iconv_handle_reinit(talloc_autofree_context(),
171 "ASCII", "UTF-8", "ASCII", true, NULL);
172 return global_iconv_handle;
175 struct smb_iconv_handle *get_iconv_testing_handle(TALLOC_CTX *mem_ctx,
176 const char *dos_charset,
177 const char *unix_charset,
178 const char *display_charset)
180 return smb_iconv_handle_reinit(mem_ctx,
181 dos_charset, unix_charset, display_charset, true, NULL);
185 * Return the name of a charset to give to iconv().
187 const char *charset_name(struct smb_iconv_handle *ic, charset_t ch)
190 case CH_UTF16: return "UTF-16LE";
191 case CH_UNIX: return ic->unix_charset;
192 case CH_DOS: return ic->dos_charset;
193 case CH_DISPLAY: return ic->display_charset;
194 case CH_UTF8: return "UTF8";
195 case CH_UTF16BE: return "UTF-16BE";
196 case CH_UTF16MUNGED: return "UTF16_MUNGED";
203 re-initialize iconv conversion descriptors
205 static int close_iconv_handle(struct smb_iconv_handle *data)
208 for (c1=0;c1<NUM_CHARSETS;c1++) {
209 for (c2=0;c2<NUM_CHARSETS;c2++) {
210 if (data->conv_handles[c1][c2] != NULL) {
211 if (data->conv_handles[c1][c2] != (smb_iconv_t)-1) {
212 smb_iconv_close(data->conv_handles[c1][c2]);
214 data->conv_handles[c1][c2] = NULL;
222 static const char *map_locale(const char *charset)
224 if (strcmp(charset, "LOCALE") != 0) {
227 #if defined(HAVE_NL_LANGINFO) && defined(CODESET)
232 ln = nl_langinfo(CODESET);
234 DEBUG(1,("Unable to determine charset for LOCALE - using ASCII\n"));
237 /* Check whether the charset name is supported
239 handle = smb_iconv_open(ln, "UCS-2LE");
240 if (handle == (smb_iconv_t) -1) {
241 DEBUG(5,("Locale charset '%s' unsupported, using ASCII instead\n", ln));
244 DEBUG(5,("Substituting charset '%s' for LOCALE\n", ln));
245 smb_iconv_close(handle);
254 the old_ic is passed in here as the smb_iconv_handle structure
255 is used as a global pointer in some places (eg. python modules). We
256 don't want to invalidate those global pointers, but we do want to
257 update them with the right charset information when loadparm
258 runs. To do that we need to re-use the structure pointer, but
259 re-fill the elements in the structure with the updated values
261 _PUBLIC_ struct smb_iconv_handle *smb_iconv_handle_reinit(TALLOC_CTX *mem_ctx,
262 const char *dos_charset,
263 const char *unix_charset,
264 const char *display_charset,
266 struct smb_iconv_handle *old_ic)
268 struct smb_iconv_handle *ret;
270 display_charset = map_locale(display_charset);
272 if (old_ic != NULL) {
274 close_iconv_handle(ret);
275 talloc_free(ret->child_ctx);
278 ret = talloc_zero(mem_ctx, struct smb_iconv_handle);
284 /* we use a child context to allow us to free all ptrs without
285 freeing the structure itself */
286 ret->child_ctx = talloc_new(ret);
287 if (ret->child_ctx == NULL) {
291 talloc_set_destructor(ret, close_iconv_handle);
293 ret->dos_charset = talloc_strdup(ret->child_ctx, dos_charset);
294 ret->unix_charset = talloc_strdup(ret->child_ctx, unix_charset);
295 ret->display_charset = talloc_strdup(ret->child_ctx, display_charset);
296 ret->native_iconv = native_iconv;
302 on-demand initialisation of conversion handles
304 smb_iconv_t get_conv_handle(struct smb_iconv_handle *ic,
305 charset_t from, charset_t to)
309 if (ic->conv_handles[from][to]) {
310 return ic->conv_handles[from][to];
313 n1 = charset_name(ic, from);
314 n2 = charset_name(ic, to);
316 ic->conv_handles[from][to] = smb_iconv_open_ex(ic, n2, n1,
319 if (ic->conv_handles[from][to] == (smb_iconv_t)-1) {
320 if ((from == CH_DOS || to == CH_DOS) &&
321 strcasecmp(charset_name(ic, CH_DOS), "ASCII") != 0) {
322 DEBUG(0,("dos charset '%s' unavailable - using ASCII\n",
323 charset_name(ic, CH_DOS)));
324 ic->dos_charset = "ASCII";
326 n1 = charset_name(ic, from);
327 n2 = charset_name(ic, to);
329 ic->conv_handles[from][to] =
330 smb_iconv_open_ex(ic, n2, n1, ic->native_iconv);
334 return ic->conv_handles[from][to];
338 * Return the unicode codepoint for the next character in the input
339 * string in the given src_charset.
340 * The unicode codepoint (codepoint_t) is an unsinged 32 bit value.
342 * Also return the number of bytes consumed (which tells the caller
343 * how many bytes to skip to get to the next src_charset-character).
345 * This is implemented (in the non-ascii-case) by first converting the
346 * next character in the input string to UTF16_LE and then calculating
347 * the unicode codepoint from that.
349 * Return INVALID_CODEPOINT if the next character cannot be converted.
351 _PUBLIC_ codepoint_t next_codepoint_handle_ext(
352 struct smb_iconv_handle *ic,
353 const char *str, charset_t src_charset,
354 size_t *bytes_consumed)
356 /* it cannot occupy more than 4 bytes in UTF16 format */
358 smb_iconv_t descriptor;
364 if ((str[0] & 0x80) == 0) {
366 return (codepoint_t)str[0];
370 * we assume that no multi-byte character can take more than 5 bytes.
371 * This is OK as we only support codepoints up to 1M (U+100000)
373 ilen_orig = strnlen(str, 5);
376 descriptor = get_conv_handle(ic, src_charset, CH_UTF16);
377 if (descriptor == (smb_iconv_t)-1) {
379 return INVALID_CODEPOINT;
383 * this looks a little strange, but it is needed to cope with
384 * codepoints above 64k (U+1000) which are encoded as per RFC2781.
387 outbuf = (char *)buf;
388 smb_iconv(descriptor, &str, &ilen, &outbuf, &olen);
391 outbuf = (char *)buf;
392 smb_iconv(descriptor, &str, &ilen, &outbuf, &olen);
394 /* we didn't convert any bytes */
396 return INVALID_CODEPOINT;
403 *bytes_consumed = ilen_orig - ilen;
406 return (codepoint_t)SVAL(buf, 0);
409 /* decode a 4 byte UTF16 character manually */
410 return (codepoint_t)0x10000 +
411 (buf[2] | ((buf[3] & 0x3)<<8) |
412 (buf[0]<<10) | ((buf[1] & 0x3)<<18));
415 /* no other length is valid */
416 return INVALID_CODEPOINT;
420 return the unicode codepoint for the next multi-byte CH_UNIX character
423 also return the number of bytes consumed (which tells the caller
424 how many bytes to skip to get to the next CH_UNIX character)
426 return INVALID_CODEPOINT if the next character cannot be converted
428 _PUBLIC_ codepoint_t next_codepoint_handle(struct smb_iconv_handle *ic,
429 const char *str, size_t *size)
431 return next_codepoint_handle_ext(ic, str, CH_UNIX, size);
435 push a single codepoint into a CH_UNIX string the target string must
436 be able to hold the full character, which is guaranteed if it is at
437 least 5 bytes in size. The caller may pass less than 5 bytes if they
438 are sure the character will fit (for example, you can assume that
439 uppercase/lowercase of a character will not add more than 1 byte)
441 return the number of bytes occupied by the CH_UNIX character, or
444 _PUBLIC_ ssize_t push_codepoint_handle(struct smb_iconv_handle *ic,
445 char *str, codepoint_t c)
447 smb_iconv_t descriptor;
457 descriptor = get_conv_handle(ic,
459 if (descriptor == (smb_iconv_t)-1) {
468 smb_iconv(descriptor, &inbuf, &ilen, &str, &olen);
477 buf[0] = (c>>10) & 0xFF;
478 buf[1] = (c>>18) | 0xd8;
480 buf[3] = ((c>>8) & 0x3) | 0xdc;
486 smb_iconv(descriptor, &inbuf, &ilen, &str, &olen);
493 _PUBLIC_ codepoint_t next_codepoint_ext(const char *str, charset_t src_charset,
496 return next_codepoint_handle_ext(get_iconv_handle(), str,
500 _PUBLIC_ codepoint_t next_codepoint(const char *str, size_t *size)
502 return next_codepoint_handle(get_iconv_handle(), str, size);
505 _PUBLIC_ ssize_t push_codepoint(char *str, codepoint_t c)
507 return push_codepoint_handle(get_iconv_handle(), str, c);