summaryrefslogtreecommitdiff
path: root/plugins/UserInfoEx/src/mir_db.cpp
blob: f659d376370a5f661dc572f1ac95603b68e0b86f (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
/*
UserinfoEx plugin for Miranda IM

Copyright:
© 2006-2010 DeathAxe, Yasnovidyashii, Merlin, K. Romanov, Kreol

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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include "stdafx.h"

namespace DB {

/**
* This namespace contains all functions used to access or modify contacts in the database.
**/

namespace Contact {
/**
 * This function trys to guess, when an ICQ contact was added to database.
 **/
DWORD	WhenAdded(DWORD dwUIN, LPCSTR)
{
	DBEVENTINFO	dbei = {};
	for (MEVENT edbe = db_event_first(NULL); edbe != NULL; edbe = db_event_next(NULL, edbe)) {
		// get eventtype and compare
		if (!DB::Event::GetInfo(edbe, &dbei) && dbei.eventType == EVENTTYPE_ADDED) {
			if (!DB::Event::GetInfoWithData(edbe, &dbei)) {
				// extract UIN and compare with given one
				DWORD dwEvtUIN;
				memcpy(&dwEvtUIN, dbei.pBlob, sizeof(DWORD));
				MIR_FREE(dbei.pBlob);
				if (dwEvtUIN == dwUIN)
					return dbei.timestamp;
			}
		}
	}
	return 0;
}

} /* Contact */

namespace Module {

/**
* Deletes all settings in the module.
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to delete the setting from (e.g. USERINFO)
* return:	nothing
**/

void	Delete(MCONTACT hContact, LPCSTR pszModule)
{
	CEnumList Settings;
	if (!Settings.EnumSettings(hContact, pszModule))
		for (auto &it : Settings)
			db_unset(hContact, pszModule, it);
}

/**
* Enum Proc for DBModule_IsEmpty
* @param	pszSetting	- the setting
* @param	lParam		- DBCONTACTENUMSETTINGS - (LPARAM)&dbces
* @retval	TRUE		- always true
**/

static int IsEmptyEnumProc(LPCSTR, void*)
{
	return 1;
}

/**
* This function tests, whether a module is empty for the given contact or not
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @retval	TRUE		- the module is empty
* @retval	FALSE		- the module contains settings
**/

bool IsEmpty(MCONTACT hContact, LPCSTR pszModule)
{
	return 0 > db_enum_settings(hContact, IsEmptyEnumProc, pszModule);
}

/**
* This function tests, whether a module belongs to a metacontact protocol
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @retval	TRUE		- the module belongs to a metacontact protocol
* @retval	FALSE		- the module belongs to a other protocol
**/

bool IsMeta(LPCSTR pszModule)
{
	return !mir_strcmp(pszModule, META_PROTO);
}

/**
* This function tests, whether a module is a meta contact, and user wants to scan it for settings
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @retval	TRUE		- the module is empty
* @retval	FALSE		- the module contains settings
**/

bool IsMetaAndScan(LPCSTR pszModule)
{
	return 0 != db_get_b(NULL, MODNAME, SET_META_SCAN, TRUE) && IsMeta(pszModule);
}

} /* namespace Module */

namespace Setting {

/**
* This function calls MS_DB_CONTACT_GETSETTING_STR service to get database values. 
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @param	pszSetting	- the setting to read
* @param	destType	- desired string type (DBVT_ASCIIZ, DBVT_WCHAR, DBVT_UTF8)
*
* @retval	0 - success
* @retval	1 - error
**/

BYTE Get(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszSetting, DBVARIANT *dbv, const BYTE destType)
{
	// read value without translation to specific type
	BYTE result = db_get_s(hContact, pszModule, pszSetting, dbv, 0) != 0;

	// Is value read successfully and destination type set?
	if (!result && destType)
		result = DB::Variant::ConvertString(dbv, destType);
	return result;
}

/**
* This function reads a value from the database and returns it as an ansi encoded string.
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @param	pszSetting	- the setting to read
*
* @return	string value
**/

LPSTR	GetAString(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszSetting)
{
	DBVARIANT dbv;
	if (GetAString(hContact, pszModule, pszSetting, &dbv) == 0){
		if (DB::Variant::dbv2String(&dbv, DBVT_WCHAR) == 0)
			return dbv.pszVal;

		db_free(&dbv);
	}
	return nullptr;
}

/**
* This function reads a value from the database and returns it as an unicode encoded string. 
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @param	pszSetting	- the setting to read
*
* @return	string value
**/

LPWSTR GetWString(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszSetting)
{
	DBVARIANT dbv;
	if (GetWString(hContact, pszModule, pszSetting, &dbv) == 0) {
		if (DB::Variant::dbv2String(&dbv, DBVT_WCHAR) == 0)
			return dbv.pwszVal;

		db_free(&dbv);
	}
	return nullptr;
}

/**
* This function calls MS_DB_CONTACT_GETSETTING_STR service to get database values. 
* It searches in pszModule first and if the setting does not exist there it tries proto to retrieve it.
* @param	hContact	- handle to the contact
* @param	pszModule	- the module to read the setting from (e.g. USERINFO)
* @param	szProto		- the contact's protocol to read the setting from (e.g. ICQ)
* @param	szSetting	- the setting to read
* @param	destType	- desired string type (DBVT_ASCIIZ, DBVT_WCHAR, DBVT_UTF8)
*
* @retval	0 - success
* @retval	1 - error
**/

BYTE GetEx(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszProto, LPCSTR pszSetting, DBVARIANT *dbv, const BYTE destType)
{
	BYTE result = !pszModule || Get(hContact, pszModule, pszSetting, dbv, destType);
	// try to read setting from the contact's protocol module 
	if (result && pszProto) {
		result = Get(hContact, pszProto, pszSetting, dbv, destType) != 0;
		// try to get setting from a metasubcontact
		if (result && DB::Module::IsMetaAndScan(pszProto)) {
			const INT_PTR def = db_mc_getDefaultNum(hContact);
			MCONTACT hSubContact;
			// try to get setting from the default subcontact first
			if (def > -1 && def < INT_MAX) {
				hSubContact = db_mc_getSub(hContact, def);
				if (hSubContact != NULL)
					result = DB::Setting::GetEx(hSubContact, pszModule, Proto_GetBaseAccountName(hSubContact), pszSetting, dbv, destType) != 0;
			}
			// scan all subcontacts for the setting
			if (result) {
				const INT_PTR cnt = db_mc_getSubCount(hContact);
				if (cnt < INT_MAX) {
					INT_PTR i;
					for (i = 0; result && i < cnt; i++) {
						if (i != def) {
							hSubContact = db_mc_getSub(hContact, i);
							if (hSubContact != NULL)
								result = DB::Setting::GetEx(hSubContact, pszModule, Proto_GetBaseAccountName(hSubContact), pszSetting, dbv, destType) != 0;
	}	}	}	}	}	}

	return result;
}

/**
* This function is used by the controls of the details dialog and calls MS_DB_CONTACT_GETSETTING_STR service
* to get database values. It searches in pszModule first and if the setting does not exist there it tries proto
* to retrieve it.
* @param	hContact		- handle to the contact
* @param	pszModule		- the module to read the setting from (e.g. USERINFO)
* @param	pszSubModule	- the module to read the setting from a meta subcontract (e.g. USERINFO)
* @param	pszProto		- the contact's protocol to read the setting from (e.g. ICQ)
* @param	pszSetting		- the setting to read
* @param	destType		- desired string type (DBVT_ASCIIZ, DBVT_WCHAR, DBVT_UTF8)
*
* @return	This function returns the WORD which contains the source of information.
**/

WORD GetCtrl(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszSubModule, LPCSTR pszProto, LPCSTR pszSetting, DBVARIANT *dbv, const BYTE destType)
{
	WORD wFlags = 0;

	// read setting from given module
	if (hContact && pszModule && *pszModule && !Get(hContact, pszModule, pszSetting, dbv, destType)) {
		wFlags |= CTRLF_HASCUSTOM;
		if (Exists(hContact, pszProto, pszSetting))
			wFlags |= CTRLF_HASPROTO;
	}
	// read setting from contact's basic protocol
	else if (pszProto && *pszProto) {
		// try to read the setting from the basic protocol
		if (!Get(hContact, pszProto, pszSetting, dbv, destType))
			wFlags |= CTRLF_HASPROTO;

		// try to read the setting from the sub contacts' modules
		else if (DB::Module::IsMetaAndScan(pszProto)) {
			const INT_PTR def = db_mc_getDefaultNum(hContact);
			MCONTACT hSubContact;
			// try to get setting from the default subcontact first
			if (def > -1 && def < INT_MAX) {
				hSubContact = db_mc_getSub(hContact, def);
				if (hSubContact != NULL) {
					wFlags = GetCtrl(hSubContact, pszSubModule, nullptr, Proto_GetBaseAccountName(hSubContact), pszSetting, dbv, destType);
					if (wFlags != 0) {
						wFlags &= ~CTRLF_HASCUSTOM;
						wFlags |= CTRLF_HASMETA;
					}
				}
			}
			// copy the missing settings from the other subcontacts
			if (wFlags == 0) {
				INT_PTR i;
				const INT_PTR cnt = db_mc_getSubCount(hContact);
				for (i = 0; i < cnt; i++) {
					if (i != def) {
						hSubContact = db_mc_getSub(hContact, i);
						if (hSubContact != NULL) {
							wFlags = GetCtrl(hSubContact, pszSubModule, nullptr, Proto_GetBaseAccountName(hSubContact), pszSetting, dbv, destType);
							if (wFlags != 0) {
								wFlags &= ~CTRLF_HASCUSTOM;
								wFlags |= CTRLF_HASMETA;
								break;
	}	}	}	}	}	}	}

	if (wFlags == 0)
		dbv->type = DBVT_DELETED;

	return wFlags;
}

/**
* This function checks for the existence of the given setting in the database
* @param	hContact		- handle to the contact
* @param	pszModule		- the module to read the setting from (e.g. USERINFO)
* @param	pszSetting		- the setting to check
*
* @retval	TRUE			- setting exists
* @retval	FALSE			- setting does not exist
**/

BYTE Exists(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszSetting)
{
	if (pszModule && pszSetting) {
		CHAR szDummy[1];
		return 0 == db_get_static(hContact, pszModule, pszSetting, szDummy, 1);
	}
	return FALSE;
}

/**
* This function deletes all reluctant settings of an setting array such as My-phoneXX.
* @param	hContact		- handle to the contact
* @param	pszModule		- the module to read the setting from (e.g. USERINFO)
* @param	pszFormat		- the format, telling what a array of settings is ment
* @param	iStart			- the first index of the setting to delete
*
* @return	nothing
**/

void DeleteArray(MCONTACT hContact, LPCSTR pszModule, LPCSTR pszFormat, int iStart)
{
	char pszSetting[MAXSETTING];
	do {
		mir_snprintf(pszSetting, pszFormat, iStart++);
	}
		while (!db_unset(hContact, pszModule, pszSetting));
}

} /* namespace Setting */

namespace Variant {

/**
* This function converts a string value of the DBVARIANT to the destination type
* but keeps all other values as is.
* @param		dbv			- pointer to DBVARIANT structure which is to manipulate
* @param		destType	- one of (DBVT_ASCIIZ, DBVT_UTF8 or DBVT_WCHAR)
*
* @retval		0			- success
* @retval		1			- error
**/

BYTE ConvertString(DBVARIANT* dbv, const BYTE destType)
{
	if (dbv == nullptr)
		return 1;

	switch (dbv->type) {
	// source value is of type "ascii"
	case DBVT_ASCIIZ:
		switch (destType) {
		// destination type is "utf8"
		case DBVT_UTF8:
			{
				LPSTR tmpBuf = mir_utf8encode(dbv->pszVal);
				mir_free(dbv->pszVal);
				dbv->pszVal = tmpBuf;
			}
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
		// destination type is "wchar"
		case DBVT_WCHAR:
			{
				LPWSTR tmpBuf = mir_a2u(dbv->pszVal);
				mir_free(dbv->pszVal);
				dbv->pwszVal = tmpBuf;
			}
			dbv->type = (dbv->pwszVal) ? destType : DBVT_DELETED;
		}
		break;
	// source value is of type "utf8"
	case DBVT_UTF8:
		switch (destType) {
		// destination type is "ascii"
		case DBVT_ASCIIZ:
			mir_utf8decode(dbv->pszVal, nullptr);
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
		// destination type is "wchar"
		case DBVT_WCHAR:
			LPSTR savePtr = dbv->pszVal;
			dbv->pszVal = nullptr;
			mir_utf8decode(savePtr, &dbv->pwszVal);
			mir_free(savePtr);
			dbv->type = (dbv->pwszVal) ? destType : DBVT_DELETED;
		}
		break;
	// source value is of type "wchar"
	case DBVT_WCHAR:
		switch (destType) {
			// destination type is "ascii"
		case DBVT_ASCIIZ:
			{
				LPSTR tmpBuf = mir_u2a(dbv->pwszVal);
				mir_free(dbv->pwszVal);
				dbv->pszVal = tmpBuf;
			}
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
			// destination type is "utf8"
		case DBVT_UTF8:
			{
				LPSTR tmpBuf = mir_utf8encodeW(dbv->pwszVal);
				mir_free(dbv->pwszVal);
				dbv->pszVal = tmpBuf;
			}
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
		}
	}
	return dbv->type == DBVT_DELETED;
}

/**
* This function completely converts a DBVARIANT to the destination string type.
* It includes BYTE, WORD, DWORD and all string types
* @param		dbv			- pointer to DBVARIANT structure which is to manipulate
* @param		destType	- one of (DBVT_ASCIIZ, DBVT_UTF8 or DBVT_WCHAR)
*
* @retval	0 - success
* @retval	1 - error
**/

BYTE	dbv2String(DBVARIANT* dbv, const BYTE destType)
{
	if (dbv == nullptr)
		return 1;

	WCHAR wbuf[32];
	CHAR buf[32];
	switch (destType) {
	// destination type is "utf8" or "ascii"
	case DBVT_ASCIIZ:
	case DBVT_UTF8:
		switch (dbv->type) {
		// source value is of type "byte"
		case DBVT_BYTE:
			_ultoa(dbv->bVal, buf, 10);
			dbv->pszVal = mir_strdup(buf);
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of type "word"
		case DBVT_WORD:
			_ultoa(dbv->wVal, buf, 10);
			dbv->pszVal = mir_strdup(buf);
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of type "dword"
		case DBVT_DWORD:
			_ultoa(dbv->dVal, buf, 10);
			dbv->pszVal = mir_strdup(buf);
			dbv->type = (dbv->pszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of any string type
		case DBVT_ASCIIZ:
		case DBVT_WCHAR:
		case DBVT_UTF8:
			return ConvertString(dbv, destType);
		}
		break;
	
	// destination type is "wchar"
	case DBVT_WCHAR:
		switch (dbv->type) {
		// source value is of type "byte"
		case DBVT_BYTE:
			_ultow(dbv->bVal, wbuf, 10);
			dbv->pwszVal = mir_wstrdup(wbuf);
			dbv->type = (dbv->pwszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of type "word"
		case DBVT_WORD:
			_ultow(dbv->wVal, wbuf, 10);
			dbv->pwszVal = mir_wstrdup(wbuf);
			dbv->type = (dbv->pwszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of type "dword"
		case DBVT_DWORD:
			_ultow(dbv->dVal, wbuf, 10);
			dbv->pwszVal = mir_wstrdup(wbuf);
			dbv->type = (dbv->pwszVal) ? destType : DBVT_DELETED;
			break;
		// source value is of any string type
		case DBVT_ASCIIZ:
		case DBVT_WCHAR:
		case DBVT_UTF8:
			return ConvertString(dbv, destType);
		}
	}
	return dbv->type != destType;
}

} /* namespace Variant */

namespace Event {

/**
* This function initializes the DBEVENTINFO structure and calls 
* db_event_get() to retrieve information about an event.
* @param	hEvent			- the handle of the event to get information for
* @param	dbei			- the pointer to a DBEVENTINFO structure, which retrieves all information.
*
* @retval	0				- success
* @retval	nonezero		- failure
**/

bool GetInfo(MEVENT hEvent, DBEVENTINFO *dbei)
{
	dbei->cbBlob = 0;
	dbei->pBlob  = nullptr;
	return db_event_get(hEvent, dbei) != 0;
}

/**
* This function initializes the DBEVENTINFO structure and calls 
* db_event_get() to retrieve information about an event.
* @param	hEvent			- the handle of the event to get information for
* @param	dbei			- the pointer to a DBEVENTINFO structure, which retrieves all information.
*
* @retval	0				- success
* @retval	1				- failure
**/

bool GetInfoWithData(MEVENT hEvent, DBEVENTINFO *dbei)
{
	if (!dbei->cbBlob) {
		INT_PTR size = db_event_getBlobSize(hEvent);
		dbei->cbBlob = (size != -1) ? (DWORD)size : 0;
	}
	if (dbei->cbBlob) {
		dbei->pBlob = (PBYTE) mir_alloc(dbei->cbBlob);
		if (dbei->pBlob == nullptr)
			dbei->cbBlob = 0;
	}
	else dbei->pBlob = nullptr;

	bool result = db_event_get(hEvent, dbei) != 0;
	if (result && dbei->pBlob) {
		mir_free(dbei->pBlob);
		dbei->pBlob = nullptr;
	}
	return result;
}

/**
* This function returns the timestamp for the given event.
* @param	hEvent			- the handle of the event to get the timestamp for
*
* @retval	0 if no timestamp is available
* @retval	timestamp
**/

DWORD	TimeOf(MEVENT hEvent)
{
	DBEVENTINFO dbei;
	if (!GetInfo(hEvent, &dbei))
		return dbei.timestamp;

	return 0;
}

/**
* This function compares two DBEVENTINFO structures against each other.
* It compares the timestamp, eventType and module names.
* @param	d1				- pointer to the first DBEVENTINFO structure
* @param	d2				- pointer to the second DBEVENTINFO structure
* @param	Data			- default false, if true compare also blob data
.*
* @retval	TRUE			- The structures describe the same event.
* @retval	FALSE			- The two structure's events differ from each other.
**/

static FORCEINLINE bool IsEqual(const DBEVENTINFO *d1, const DBEVENTINFO *d2, bool Data)
{
	bool res = d1 && d2 && 
				(d1->timestamp == d2->timestamp) && 
				(d1->eventType == d2->eventType) &&
				(d1->cbBlob == d2->cbBlob) && 
				(!d1->szModule || !d2->szModule || !_stricmp(d1->szModule, d2->szModule));
	if (Data)
		return res && (!d1->pBlob || !d2->pBlob || !memcmp(d1->pBlob,d2->pBlob,d1->cbBlob));

	return res;
}

/**
* This functions searches for an existing event in the database, which matches
* the information provided by 'dbei'. In order to fasten up the search e.g. 
* while checking many events, this function stars searching from the last
* found event.
* @param	hContact			- the handle of the contact to search events for
* @param	hDbExistingEvent	- an existing database event to start the search from.
* @param	dbei				- the pointer to a DBEVENTINFO structure
*
* @retval	TRUE	- the event identified by its information in @c dbei exists.
* @retval	FALSE	- no event with the information of @c dbei exists.
*
**/

bool Exists(MCONTACT hContact, MEVENT& hDbExistingEvent, DBEVENTINFO *dbei)
{
	bool result = false;
	DBEVENTINFO	edbei;

	if (!hDbExistingEvent) {
		hDbExistingEvent = db_event_first(hContact);
		if (hDbExistingEvent) {
			if (!GetInfo(hDbExistingEvent, &edbei)) {
				if ((dbei->timestamp < edbei.timestamp))
					return false;

				if (IsEqual(dbei, &edbei, false)) {
					if (!GetInfoWithData(hDbExistingEvent, &edbei)) {
						if (IsEqual(dbei, &edbei, true)) {
							mir_free(edbei.pBlob);
							return true;
						}
						mir_free(edbei.pBlob);
					}
				}
			}
			MEVENT edbe = db_event_last(hContact);
			if (edbe == hDbExistingEvent)
				return FALSE;

			hDbExistingEvent = edbe;
		}
	}
	if (hDbExistingEvent) {
		MEVENT sdbe = hDbExistingEvent;
		for (MEVENT edbe = sdbe; edbe && !GetInfo(edbe, &edbei) && (dbei->timestamp <= edbei.timestamp); edbe = db_event_prev(hContact, edbe)) {
			hDbExistingEvent = edbe;
			//compare without data (faster)
			if ( result = IsEqual(dbei, &edbei, false)) {
				if (NULL == (result = !GetInfoWithData(edbe, &edbei)))
					continue;

				//compare with data
				result = IsEqual(dbei, &edbei, true);
				mir_free(edbei.pBlob);
				if (result)
					break;
			}
		} /*end for*/

		if (!result) {
			for (MEVENT edbe = db_event_next(hContact, sdbe); edbe && !GetInfo(edbe, &edbei) && (dbei->timestamp >= edbei.timestamp); edbe = db_event_next(hContact, edbe)) {
				hDbExistingEvent = edbe;
				//compare without data (faster)
				if (result = IsEqual(dbei, &edbei, false)) {
					if (NULL == (result = !GetInfoWithData(edbe, &edbei)))
						continue;

					//compare with data
					result = IsEqual(dbei, &edbei, true);
					mir_free(edbei.pBlob);
					if (result)
						break;
				}
			}
		}
	}
	return result;
}

} /* namespace Events */

int CEnumList::EnumProc(LPCSTR pszName, void *pParam)
{
	if (pszName)
		((CEnumList*)pParam)->Insert(pszName);
	return 0;
}

int CEnumList::EnumSettingsProc(LPCSTR pszName, void *param)
{
	return EnumProc(pszName, param);
}

int CEnumList::CompareProc(LPCSTR p1, LPCSTR p2)
{
	if (p1) {
		if (p2)
			return mir_strcmp(p1, p2);

		return 1;
	}
	return 0;
}

CEnumList::CEnumList()	: LIST<CHAR>(50, CEnumList::CompareProc)
{
}

CEnumList::~CEnumList() 
{ 
	for (auto &it : *this)
		mir_free(it);
}

LPSTR CEnumList::Insert(LPCSTR str)
{
	LPSTR p = mir_strdup(str);
	if (p && !insert(p)) {
		mir_free(p);
		p = nullptr;
	}
	return p;
}

INT_PTR CEnumList::EnumModules()
{
	return db_enum_modules(CEnumList::EnumProc, this);
}

/**
* @retval	-1	- no settings to enumerate
* @retval	 0	- success
**/

INT_PTR CEnumList::EnumSettings(MCONTACT hContact, LPCSTR pszModule)
{
	return db_enum_settings(hContact, &CEnumList::EnumSettingsProc, pszModule, this);
}

} /* namespace DB */