summaryrefslogtreecommitdiffstats
path: root/source3/lib/util_unistr.c
blob: 4e78d1b0642e55134d4f79eba57021b59f04ba6a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) Simo Sorce 2001
   Copyright (C) Jeremy Allison 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

#ifndef MAXUNI
#define MAXUNI 1024
#endif

/* these 3 tables define the unicode case handling.  They are loaded
   at startup either via mmap() or read() from the lib directory */
static smb_ucs2_t *upcase_table;
static smb_ucs2_t *lowcase_table;
static uint8 *valid_table;
static bool upcase_table_use_unmap;
static bool lowcase_table_use_unmap;
static bool valid_table_use_unmap;
static bool initialized;

/**
 * Destroy global objects allocated by load_case_tables()
 **/
void gfree_case_tables(void)
{
	if ( upcase_table ) {
		if ( upcase_table_use_unmap )
			unmap_file(upcase_table, 0x20000);
		else
			SAFE_FREE(upcase_table);
	}

	if ( lowcase_table ) {
		if ( lowcase_table_use_unmap )
			unmap_file(lowcase_table, 0x20000);
		else
			SAFE_FREE(lowcase_table);
	}

	if ( valid_table ) {
		if ( valid_table_use_unmap )
			unmap_file(valid_table, 0x10000);
		else
			SAFE_FREE(valid_table);
	}
	initialized = false;
}

/**
 * Load or generate the case handling tables.
 *
 * The case tables are defined in UCS2 and don't depend on any
 * configured parameters, so they never need to be reloaded.
 **/

void load_case_tables(void)
{
	char *old_locale = NULL, *saved_locale = NULL;
	int i;
	TALLOC_CTX *frame = NULL;

	if (initialized) {
		return;
	}
	initialized = true;

	frame = talloc_stackframe();

	upcase_table = (smb_ucs2_t *)map_file(data_path("upcase.dat"),
					      0x20000);
	upcase_table_use_unmap = ( upcase_table != NULL );

	lowcase_table = (smb_ucs2_t *)map_file(data_path("lowcase.dat"),
					       0x20000);
	lowcase_table_use_unmap = ( lowcase_table != NULL );

#ifdef HAVE_SETLOCALE
	/* Get the name of the current locale.  */
	old_locale = setlocale(LC_ALL, NULL);

	if (old_locale) {
		/* Save it as it is in static storage. */
		saved_locale = SMB_STRDUP(old_locale);
	}

	/* We set back the locale to C to get ASCII-compatible toupper/lower functions. */
	setlocale(LC_ALL, "C");
#endif

	/* we would like Samba to limp along even if these tables are
	   not available */
	if (!upcase_table) {
		DEBUG(1,("creating lame upcase table\n"));
		upcase_table = (smb_ucs2_t *)SMB_MALLOC(0x20000);
		for (i=0;i<0x10000;i++) {
			smb_ucs2_t v;
			SSVAL(&v, 0, i);
			upcase_table[v] = i;
		}
		for (i=0;i<256;i++) {
			smb_ucs2_t v;
			SSVAL(&v, 0, UCS2_CHAR(i));
			upcase_table[v] = UCS2_CHAR(islower(i)?toupper(i):i);
		}
	}

	if (!lowcase_table) {
		DEBUG(1,("creating lame lowcase table\n"));
		lowcase_table = (smb_ucs2_t *)SMB_MALLOC(0x20000);
		for (i=0;i<0x10000;i++) {
			smb_ucs2_t v;
			SSVAL(&v, 0, i);
			lowcase_table[v] = i;
		}
		for (i=0;i<256;i++) {
			smb_ucs2_t v;
			SSVAL(&v, 0, UCS2_CHAR(i));
			lowcase_table[v] = UCS2_CHAR(isupper(i)?tolower(i):i);
		}
	}

#ifdef HAVE_SETLOCALE
	/* Restore the old locale. */
	if (saved_locale) {
		setlocale (LC_ALL, saved_locale);
		SAFE_FREE(saved_locale);
	}
#endif
	TALLOC_FREE(frame);
}

static int check_dos_char_slowly(smb_ucs2_t c)
{
	char buf[10];
	smb_ucs2_t c2 = 0;
	int len1, len2;

	len1 = convert_string(CH_UTF16LE, CH_DOS, &c, 2, buf, sizeof(buf),False);
	if (len1 == 0) {
		return 0;
	}
	len2 = convert_string(CH_DOS, CH_UTF16LE, buf, len1, &c2, 2,False);
	if (len2 != 2) {
		return 0;
	}
	return (c == c2);
}

/**
 * Load the valid character map table from <tt>valid.dat</tt> or
 * create from the configured codepage.
 *
 * This function is called whenever the configuration is reloaded.
 * However, the valid character table is not changed if it's loaded
 * from a file, because we can't unmap files.
 **/

void init_valid_table(void)
{
	static int mapped_file;
	int i;
	const char *allowed = ".!#$%&'()_-@^`~";
	uint8 *valid_file;

	if (mapped_file) {
		/* Can't unmap files, so stick with what we have */
		return;
	}

	valid_file = (uint8 *)map_file(data_path("valid.dat"), 0x10000);
	if (valid_file) {
		valid_table = valid_file;
		mapped_file = 1;
		valid_table_use_unmap = True;
		return;
	}

	/* Otherwise, we're using a dynamically created valid_table.
	 * It might need to be regenerated if the code page changed.
	 * We know that we're not using a mapped file, so we can
	 * free() the old one. */
	SAFE_FREE(valid_table);

	/* use free rather than unmap */
	valid_table_use_unmap = False;

	DEBUG(2,("creating default valid table\n"));
	valid_table = (uint8 *)SMB_MALLOC(0x10000);
	SMB_ASSERT(valid_table != NULL);
	for (i=0;i<128;i++) {
		valid_table[i] = isalnum(i) || strchr(allowed,i);
	}

	lazy_initialize_conv();

	for (;i<0x10000;i++) {
		smb_ucs2_t c;
		SSVAL(&c, 0, i);
		valid_table[i] = check_dos_char_slowly(c);
	}
}

/*******************************************************************
 Write a string in (little-endian) unicode format. src is in
 the current DOS codepage. len is the length in bytes of the
 string pointed to by dst.

 if null_terminate is True then null terminate the packet (adds 2 bytes)

 the return value is the length in bytes consumed by the string, including the
 null termination if applied
********************************************************************/

size_t dos_PutUniCode(char *dst,const char *src, size_t len, bool null_terminate)
{
	int flags = null_terminate ? STR_UNICODE|STR_NOALIGN|STR_TERMINATE
				   : STR_UNICODE|STR_NOALIGN;
	return push_ucs2(NULL, dst, src, len, flags);
}


/*******************************************************************
 Skip past a unicode string, but not more than len. Always move
 past a terminating zero if found.
********************************************************************/

char *skip_unibuf(char *src, size_t len)
{
	char *srcend = src + len;

	while (src < srcend && SVAL(src,0)) {
		src += 2;
	}

	if(!SVAL(src,0)) {
		src += 2;
	}

	return src;
}

/* Copy a string from little-endian or big-endian unicode source (depending
 * on flags) to internal samba format destination
 */ 

int rpcstr_pull(char* dest, void *src, int dest_len, int src_len, int flags)
{
	if (!src) {
		dest[0] = 0;
		return 0;
	}
	if(dest_len==-1) {
		dest_len=MAXUNI-3;
	}
	return pull_ucs2(NULL, dest, src, dest_len, src_len, flags|STR_UNICODE|STR_NOALIGN);
}

/* Copy a string from little-endian or big-endian unicode source (depending
 * on flags) to internal samba format destination. Allocates on talloc ctx.
 */

int rpcstr_pull_talloc(TALLOC_CTX *ctx,
			char **dest,
			void *src,
			int src_len,
			int flags)
{
	return pull_ucs2_base_talloc(ctx,
			NULL,
			dest,
			src,
			src_len,
			flags|STR_UNICODE|STR_NOALIGN);

}

/* Copy a string from a unistr2 source to internal samba format
   destination.  Use this instead of direct calls to rpcstr_pull() to avoid
   having to determine whether the source string is null terminated. */

int rpcstr_pull_unistr2_fstring(char *dest, UNISTR2 *src)
{
        return pull_ucs2(NULL, dest, src->buffer, sizeof(fstring),
                         src->uni_str_len * 2, 0);
}

/* Helper function to return a talloc'ed string. I have implemented it with a
 * copy because I don't really know how pull_ucs2 and friends calculate the
 * target size. If this turns out to be a major bottleneck someone with deeper
 * multi-byte knowledge needs to revisit this.
 * I just did (JRA :-). No longer uses copy.
 * My (VL) use is dsr_getdcname, which returns 6 strings, the alternative would
 * have been to manually talloc_strdup them in rpc_client/cli_netlogon.c.
 */

char *rpcstr_pull_unistr2_talloc(TALLOC_CTX *ctx, const UNISTR2 *src)
{
	char *dest = NULL;
	size_t dest_len;

	if (!convert_string_talloc(ctx, CH_UTF16LE, CH_UNIX, src->buffer,
				   src->uni_str_len * 2, (void *)&dest,
				   &dest_len, true))
	{
		return NULL;
	}

	/* Ensure we're returning a null terminated string. */
	if (dest_len) {
		/* Did we already process the terminating zero ? */
		if (dest[dest_len-1] != 0) {
			size_t size = talloc_get_size(dest);
			/* Have we got space to append the '\0' ? */
			if (size <= dest_len) {
				/* No, realloc. */
				dest = TALLOC_REALLOC_ARRAY(ctx, dest, char,
						dest_len+1);
				if (!dest) {
					/* talloc fail. */
					dest_len = (size_t)-1;
					return NULL;
				}
			}
			/* Yay - space ! */
			dest[dest_len] = '\0';
			dest_len++;
		}
	} else if (dest) {
		dest[0] = 0;
	}

	return dest;
}

/* Converts a string from internal samba format to unicode
 */

int rpcstr_push(void *dest, const char *src, size_t dest_len, int flags)
{
	return push_ucs2(NULL, dest, src, dest_len, flags|STR_UNICODE|STR_NOALIGN);
}

/* Converts a string from internal samba format to unicode. Always terminates.
 * Actually just a wrapper round push_ucs2_talloc().
 */

int rpcstr_push_talloc(TALLOC_CTX *ctx, smb_ucs2_t **dest, const char *src)
{
	size_t size;
	if (push_ucs2_talloc(ctx, dest, src, &size))
		return size;
	else
		return -1;
}

/*******************************************************************
 Convert a (little-endian) UNISTR2 structure to an ASCII string.
********************************************************************/

void unistr2_to_ascii(char *dest, const UNISTR2 *str, size_t maxlen)
{
	if ((str == NULL) || (str->uni_str_len == 0)) {
		*dest='\0';
		return;
	}
	pull_ucs2(NULL, dest, str->buffer, maxlen, str->uni_str_len*2, STR_NOALIGN);
}

#if 0
/*******************************************************************
 Convert a (little-endian) UNISTR3 structure to an ASCII string.
********************************************************************/

void unistr3_to_ascii(char *dest, const UNISTR3 *str, size_t maxlen)
{
	if ((str == NULL) || (str->uni_str_len == 0)) {
		*dest='\0';
		return;
	}
	pull_ucs2(NULL, dest, str->str.buffer, maxlen, str->uni_str_len*2,
	          STR_NOALIGN);
}
#endif

/*******************************************************************
 Duplicate a UNISTR2 string into a null terminated char*
 using a talloc context.
********************************************************************/

char *unistr2_to_ascii_talloc(TALLOC_CTX *ctx, const UNISTR2 *str)
{
	char *s = NULL;

	if (!str || !str->buffer) {
		return NULL;
	}
	if (pull_ucs2_base_talloc(ctx,
				NULL,
				&s,
				str->buffer,
				str->uni_str_len*2,
				STR_NOALIGN) == (size_t)-1) {
		return NULL;
	}
	return s;
}

/*******************************************************************
 Return a string for displaying a UNISTR2. Guarentees to return a
 valid string - "" if nothing else.
 Changed to use talloc_tos() under the covers.... JRA.
********************************************************************/

const char *unistr2_static(const UNISTR2 *str)
{
	char *dest = NULL;

	if ((str == NULL) || (str->uni_str_len == 0)) {
		return "";
	}

	dest = unistr2_to_ascii_talloc(talloc_tos(), str);
	if (!dest) {
		return "";
	}

	return dest;
}

/*******************************************************************
 Convert a wchar to upper case.
********************************************************************/

smb_ucs2_t toupper_w(smb_ucs2_t val)
{
	return upcase_table[SVAL(&val,0)];
}

/*******************************************************************
 Convert a wchar to lower case.
********************************************************************/

smb_ucs2_t tolower_w( smb_ucs2_t val )
{
	return lowcase_table[SVAL(&val,0)];
}

/*******************************************************************
 Determine if a character is lowercase.
********************************************************************/

bool islower_w(smb_ucs2_t c)
{
	return upcase_table[SVAL(&c,0)] != c;
}

/*******************************************************************
 Determine if a character is uppercase.
********************************************************************/

bool isupper_w(smb_ucs2_t c)
{
	return lowcase_table[SVAL(&c,0)] != c;
}

/*******************************************************************
 Determine if a character is valid in a 8.3 name.
********************************************************************/

bool isvalid83_w(smb_ucs2_t c)
{
	return valid_table[SVAL(&c,0)] != 0;
}

/*******************************************************************
 Count the number of characters in a smb_ucs2_t string.
********************************************************************/

size_t strlen_w(const smb_ucs2_t *src)
{
	size_t len;
	smb_ucs2_t c;

	for(len = 0; *(COPY_UCS2_CHAR(&c,src)); src++, len++) {
		;
	}

	return len;
}

/*******************************************************************
 Count up to max number of characters in a smb_ucs2_t string.
********************************************************************/

size_t strnlen_w(const smb_ucs2_t *src, size_t max)
{
	size_t len;
	smb_ucs2_t c;

	for(len = 0; (len < max) && *(COPY_UCS2_CHAR(&c,src)); src++, len++) {
		;
	}

	return len;
}

/*******************************************************************
 Wide strchr().
********************************************************************/

smb_ucs2_t *strchr_w(const smb_ucs2_t *s, smb_ucs2_t c)
{
	smb_ucs2_t cp;
	while (*(COPY_UCS2_CHAR(&cp,s))) {
		if (c == cp) {
			return (smb_ucs2_t *)s;
		}
		s++;
	}
	if (c == cp) {
		return (smb_ucs2_t *)s;
	}

	return NULL;
}

smb_ucs2_t *strchr_wa(const smb_ucs2_t *s, char c)
{
	return strchr_w(s, UCS2_CHAR(c));
}

/*******************************************************************
 Wide strrchr().
********************************************************************/

smb_ucs2_t *strrchr_w(const smb_ucs2_t *s, smb_ucs2_t c)
{
	smb_ucs2_t cp;
	const smb_ucs2_t *p = s;
	int len = strlen_w(s);

	if (len == 0) {
		return NULL;
	}
	p += (len - 1);
	do {
		if (c == *(COPY_UCS2_CHAR(&cp,p))) {
			return (smb_ucs2_t *)p;
		}
	} while (p-- != s);
	return NULL;
}

/*******************************************************************
 Wide version of strrchr that returns after doing strrchr 'n' times.
********************************************************************/

smb_ucs2_t *strnrchr_w(const smb_ucs2_t *s, smb_ucs2_t c, unsigned int n)
{
	smb_ucs2_t cp;
	const smb_ucs2_t *p = s;
	int len = strlen_w(s);

	if (len == 0 || !n) {
		return NULL;
	}
	p += (len - 1);
	do {
		if (c == *(COPY_UCS2_CHAR(&cp,p))) {
			n--;
		}

		if (!n) {
			return (smb_ucs2_t *)p;
		}
	} while (p-- != s);
	return NULL;
}

/*******************************************************************
 Wide strstr().
********************************************************************/

smb_ucs2_t *strstr_w(const smb_ucs2_t *s, const smb_ucs2_t *ins)
{
	smb_ucs2_t *r;
	size_t inslen;

	if (!s || !*s || !ins || !*ins) {
		return NULL;
	}

	inslen = strlen_w(ins);
	r = (smb_ucs2_t *)s;

	while ((r = strchr_w(r, *ins))) {
		if (strncmp_w(r, ins, inslen) == 0) {
			return r;
		}
		r++;
	}

	return NULL;
}

/*******************************************************************
 Convert a string to lower case.
 return True if any char is converted
********************************************************************/

bool strlower_w(smb_ucs2_t *s)
{
	smb_ucs2_t cp;
	bool ret = False;

	while (*(COPY_UCS2_CHAR(&cp,s))) {
		smb_ucs2_t v = tolower_w(cp);
		if (v != cp) {
			COPY_UCS2_CHAR(s,&v);
			ret = True;
		}
		s++;
	}
	return ret;
}

/*******************************************************************
 Convert a string to upper case.
 return True if any char is converted
********************************************************************/

bool strupper_w(smb_ucs2_t *s)
{
	smb_ucs2_t cp;
	bool ret = False;
	while (*(COPY_UCS2_CHAR(&cp,s))) {
		smb_ucs2_t v = toupper_w(cp);
		if (v != cp) {
			COPY_UCS2_CHAR(s,&v);
			ret = True;
		}
		s++;
	}
	return ret;
}

/*******************************************************************
 Convert a string to "normal" form.
********************************************************************/

void strnorm_w(smb_ucs2_t *s, int case_default)
{
	if (case_default == CASE_UPPER) {
		strupper_w(s);
	} else {
		strlower_w(s);
	}
}

int strcmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b)
{
	smb_ucs2_t cpa, cpb;

	while ((*(COPY_UCS2_CHAR(&cpb,b))) && (*(COPY_UCS2_CHAR(&cpa,a)) == cpb)) {
		a++;
		b++;
	}
	return (*(COPY_UCS2_CHAR(&cpa,a)) - *(COPY_UCS2_CHAR(&cpb,b)));
	/* warning: if *a != *b and both are not 0 we return a random
		greater or lesser than 0 number not realted to which
		string is longer */
}

int strncmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b, size_t len)
{
	smb_ucs2_t cpa, cpb;
	size_t n = 0;

	while ((n < len) && (*(COPY_UCS2_CHAR(&cpb,b))) && (*(COPY_UCS2_CHAR(&cpa,a)) == cpb)) {
		a++;
		b++;
		n++;
	}
	return (len - n)?(*(COPY_UCS2_CHAR(&cpa,a)) - *(COPY_UCS2_CHAR(&cpb,b))):0;
}

/*******************************************************************
 Case insensitive string comparison.
********************************************************************/

int strcasecmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b)
{
	smb_ucs2_t cpa, cpb;

	while ((*COPY_UCS2_CHAR(&cpb,b)) && toupper_w(*(COPY_UCS2_CHAR(&cpa,a))) == toupper_w(cpb)) {
		a++;
		b++;
	}
	return (tolower_w(*(COPY_UCS2_CHAR(&cpa,a))) - tolower_w(*(COPY_UCS2_CHAR(&cpb,b))));
}

/*******************************************************************
 Case insensitive string comparison, length limited.
********************************************************************/

int strncasecmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b, size_t len)
{
	smb_ucs2_t cpa, cpb;
	size_t n = 0;

	while ((n < len) && *COPY_UCS2_CHAR(&cpb,b) && (toupper_w(*(COPY_UCS2_CHAR(&cpa,a))) == toupper_w(cpb))) {
		a++;
		b++;
		n++;
	}
	return (len - n)?(tolower_w(*(COPY_UCS2_CHAR(&cpa,a))) - tolower_w(*(COPY_UCS2_CHAR(&cpb,b)))):0;
}

/*******************************************************************
 Compare 2 strings.
********************************************************************/

bool strequal_w(const smb_ucs2_t *s1, const smb_ucs2_t *s2)
{
	if (s1 == s2) {
		return(True);
	}
	if (!s1 || !s2) {
		return(False);
	}
  
	return(strcasecmp_w(s1,s2)==0);
}

/*******************************************************************
 Compare 2 strings up to and including the nth char.
******************************************************************/

bool strnequal_w(const smb_ucs2_t *s1,const smb_ucs2_t *s2,size_t n)
{
	if (s1 == s2) {
		return(True);
	}
	if (!s1 || !s2 || !n) {
		return(False);
	}
  
	return(strncasecmp_w(s1,s2,n)==0);
}

/*******************************************************************
 Duplicate string.
********************************************************************/

smb_ucs2_t *strdup_w(const smb_ucs2_t *src)
{
	return strndup_w(src, 0);
}

/* if len == 0 then duplicate the whole string */

smb_ucs2_t *strndup_w(const smb_ucs2_t *src, size_t len)
{
	smb_ucs2_t *dest;
	
	if (!len) {
		len = strlen_w(src);
	}
	dest = SMB_MALLOC_ARRAY(smb_ucs2_t, len + 1);
	if (!dest) {
		DEBUG(0,("strdup_w: out of memory!\n"));
		return NULL;
	}

	memcpy(dest, src, len * sizeof(smb_ucs2_t));
	dest[len] = 0;
	return dest;
}

/*******************************************************************
 Copy a string with max len.
********************************************************************/

smb_ucs2_t *strncpy_w(smb_ucs2_t *dest, const smb_ucs2_t *src, const size_t max)
{
	smb_ucs2_t cp;
	size_t len;
	
	if (!dest || !src) {
		return NULL;
	}
	
	for (len = 0; (*COPY_UCS2_CHAR(&cp,(src+len))) && (len < max); len++) {
		cp = *COPY_UCS2_CHAR(dest+len,src+len);
	}
	cp = 0;
	for ( /*nothing*/ ; len < max; len++ ) {
		cp = *COPY_UCS2_CHAR(dest+len,&cp);
	}
	
	return dest;
}

/*******************************************************************
 Append a string of len bytes and add a terminator.
********************************************************************/

smb_ucs2_t *strncat_w(smb_ucs2_t *dest, const smb_ucs2_t *src, const size_t max)
{	
	size_t start;
	size_t len;	
	smb_ucs2_t z = 0;

	if (!dest || !src) {
		return NULL;
	}
	
	start = strlen_w(dest);
	len = strnlen_w(src, max);

	memcpy(&dest[start], src, len*sizeof(smb_ucs2_t));			
	z = *COPY_UCS2_CHAR(dest+start+len,&z);

	return dest;
}

smb_ucs2_t *strcat_w(smb_ucs2_t *dest, const smb_ucs2_t *src)
{	
	size_t start;
	size_t len;	
	smb_ucs2_t z = 0;
	
	if (!dest || !src) {
		return NULL;
	}
	
	start = strlen_w(dest);
	len = strlen_w(src);

	memcpy(&dest[start], src, len*sizeof(smb_ucs2_t));			
	z = *COPY_UCS2_CHAR(dest+start+len,&z);
	
	return dest;
}


/*******************************************************************
 Replace any occurence of oldc with newc in unicode string.
********************************************************************/

void string_replace_w(smb_ucs2_t *s, smb_ucs2_t oldc, smb_ucs2_t newc)
{
	smb_ucs2_t cp;

	for(;*(COPY_UCS2_CHAR(&cp,s));s++) {
		if(cp==oldc) {
			COPY_UCS2_CHAR(s,&newc);
		}
	}
}

/*******************************************************************
 Trim unicode string.
********************************************************************/

bool trim_string_w(smb_ucs2_t *s, const smb_ucs2_t *front,
				  const smb_ucs2_t *back)
{
	bool ret = False;
	size_t len, front_len, back_len;

	if (!s) {
		return False;
	}

	len = strlen_w(s);

	if (front && *front) {
		front_len = strlen_w(front);
		while (len && strncmp_w(s, front, front_len) == 0) {
			memmove(s, (s + front_len), (len - front_len + 1) * sizeof(smb_ucs2_t));
			len -= front_len;
			ret = True;
		}
	}
	
	if (back && *back) {
		back_len = strlen_w(back);
		while (len && strncmp_w((s + (len - back_len)), back, back_len) == 0) {
			s[len - back_len] = 0;
			len -= back_len;
			ret = True;
		}
	}

	return ret;
}

/*
  The *_wa() functions take a combination of 7 bit ascii
  and wide characters They are used so that you can use string
  functions combining C string constants with ucs2 strings

  The char* arguments must NOT be multibyte - to be completely sure
  of this only pass string constants */

int strcmp_wa(const smb_ucs2_t *a, const char *b)
{
	smb_ucs2_t cp = 0;

	while (*b && *(COPY_UCS2_CHAR(&cp,a)) == UCS2_CHAR(*b)) {
		a++;
		b++;
	}
	return (*(COPY_UCS2_CHAR(&cp,a)) - UCS2_CHAR(*b));
}

int strncmp_wa(const smb_ucs2_t *a, const char *b, size_t len)
{
	smb_ucs2_t cp = 0;
	size_t n = 0;

	while ((n < len) && *b && *(COPY_UCS2_CHAR(&cp,a)) == UCS2_CHAR(*b)) {
		a++;
		b++;
		n++;
	}
	return (len - n)?(*(COPY_UCS2_CHAR(&cp,a)) - UCS2_CHAR(*b)):0;
}

smb_ucs2_t *strpbrk_wa(const smb_ucs2_t *s, const char *p)
{
	smb_ucs2_t cp;

	while (*(COPY_UCS2_CHAR(&cp,s))) {
		int i;
		for (i=0; p[i] && cp != UCS2_CHAR(p[i]); i++) 
			;
		if (p[i]) {
			return (smb_ucs2_t *)s;
		}
		s++;
	}
	return NULL;
}

smb_ucs2_t *strstr_wa(const smb_ucs2_t *s, const char *ins)
{
	smb_ucs2_t *r;
	size_t inslen;

	if (!s || !ins) { 
		return NULL;
	}

	inslen = strlen(ins);
	r = (smb_ucs2_t *)s;

	while ((r = strchr_w(r, UCS2_CHAR(*ins)))) {
		if (strncmp_wa(r, ins, inslen) == 0) 
			return r;
		r++;
	}

	return NULL;
}

/*******************************************************************
 Returns the length in number of wide characters.
******************************************************************/

int unistrlen(uint16 *s)
{
	int len;

	if (!s) {
		return -1;
	}

	for (len=0; SVAL(s,0); s++,len++) {
		;
	}

	return len;
}

/*******************************************************************
 Strcpy for unicode strings. Returns length (in num of wide chars).
 Not odd align safe.
********************************************************************/

int unistrcpy(uint16 *dst, uint16 *src)
{
	int num_wchars = 0;

	while (SVAL(src,0)) {
		*dst++ = *src++;
		num_wchars++;
	}
	*dst = 0;

	return num_wchars;
}

/**
 * Samba ucs2 type to UNISTR2 conversion
 *
 * @param ctx Talloc context to create the dst strcture (if null) and the 
 *            contents of the unicode string.
 * @param dst UNISTR2 destination. If equals null, then it's allocated.
 * @param src smb_ucs2_t source.
 * @param max_len maximum number of unicode characters to copy. If equals
 *        null, then null-termination of src is taken
 *
 * @return copied UNISTR2 destination
 **/

UNISTR2* ucs2_to_unistr2(TALLOC_CTX *ctx, UNISTR2* dst, smb_ucs2_t* src)
{
	size_t len;

	if (!src) {
		return NULL;
	}

	len = strlen_w(src);
	
	/* allocate UNISTR2 destination if not given */
	if (!dst) {
		dst = TALLOC_P(ctx, UNISTR2);
		if (!dst)
			return NULL;
	}
	if (!dst->buffer) {
		dst->buffer = TALLOC_ARRAY(ctx, uint16, len + 1);
		if (!dst->buffer)
			return NULL;
	}
	
	/* set UNISTR2 parameters */
	dst->uni_max_len = len + 1;
	dst->offset = 0;
	dst->uni_str_len = len;
	
	/* copy the actual unicode string */
	strncpy_w(dst->buffer, src, dst->uni_max_len);
	
	return dst;
}

/*************************************************************
 ascii only toupper - saves the need for smbd to be in C locale.
*************************************************************/

int toupper_ascii(int c)
{
	smb_ucs2_t uc = toupper_w(UCS2_CHAR(c));
	return UCS2_TO_CHAR(uc);
}

/*************************************************************
 ascii only tolower - saves the need for smbd to be in C locale.
*************************************************************/

int tolower_ascii(int c)
{
	smb_ucs2_t uc = tolower_w(UCS2_CHAR(c));
	return UCS2_TO_CHAR(uc);
}

/*************************************************************
 ascii only isupper - saves the need for smbd to be in C locale.
*************************************************************/

int isupper_ascii(int c)
{
	return isupper_w(UCS2_CHAR(c));
}

/*************************************************************
 ascii only islower - saves the need for smbd to be in C locale.
*************************************************************/

int islower_ascii(int c)
{
	return islower_w(UCS2_CHAR(c));
}