Beispiel #1
0
STDMETHODIMP_(BOOL) CDbxKV::WriteContactSetting(MCONTACT contactID, DBCONTACTWRITESETTING *dbcws)
{
	if (dbcws == NULL || dbcws->szSetting == NULL || dbcws->szModule == NULL || m_bReadOnly)
		return 1;

	// the db format can't tolerate more than 255 bytes of space (incl. null) for settings+module name
	int settingNameLen = (int)strlen(dbcws->szSetting);
	int moduleNameLen = (int)strlen(dbcws->szModule);
	if (settingNameLen > 0xFE) {
#ifdef _DEBUG
		OutputDebugStringA("WriteContactSetting() got a > 255 setting name length. \n");
#endif
		return 1;
	}
	if (moduleNameLen > 0xFE) {
#ifdef _DEBUG
		OutputDebugStringA("WriteContactSetting() got a > 255 module name length. \n");
#endif
		return 1;
	}

	// used for notifications
	DBCONTACTWRITESETTING dbcwNotif = *dbcws;
	if (dbcwNotif.value.type == DBVT_WCHAR) {
		if (dbcwNotif.value.pszVal != NULL) {
			char* val = mir_utf8encodeW(dbcwNotif.value.pwszVal);
			if (val == NULL)
				return 1;

			dbcwNotif.value.pszVal = (char*)alloca(strlen(val) + 1);
			strcpy(dbcwNotif.value.pszVal, val);
			mir_free(val);
			dbcwNotif.value.type = DBVT_UTF8;
		}
		else return 1;
	}

	if (dbcwNotif.szModule == NULL || dbcwNotif.szSetting == NULL)
		return 1;

	DBCONTACTWRITESETTING dbcwWork = dbcwNotif;

	mir_ptr<BYTE> pEncoded(NULL);
	bool bIsEncrypted = false;
	switch (dbcwWork.value.type) {
	case DBVT_BYTE: case DBVT_WORD: case DBVT_DWORD:
		break;

	case DBVT_ASCIIZ: case DBVT_UTF8:
		bIsEncrypted = m_bEncrypted || IsSettingEncrypted(dbcws->szModule, dbcws->szSetting);
	LBL_WriteString:
		if (dbcwWork.value.pszVal == NULL)
			return 1;
		dbcwWork.value.cchVal = (WORD)strlen(dbcwWork.value.pszVal);
		if (bIsEncrypted) {
			size_t len;
			BYTE *pResult = m_crypto->encodeString(dbcwWork.value.pszVal, &len);
			if (pResult != NULL) {
				pEncoded = dbcwWork.value.pbVal = pResult;
				dbcwWork.value.cpbVal = (WORD)len;
				dbcwWork.value.type = DBVT_ENCRYPTED;
			}
		}
		break;

	case DBVT_UNENCRYPTED:
		dbcwNotif.value.type = dbcwWork.value.type = DBVT_UTF8;
		goto LBL_WriteString;

	case DBVT_BLOB: case DBVT_ENCRYPTED:
		if (dbcwWork.value.pbVal == NULL)
			return 1;
		break;
	default:
		return 1;
	}

	mir_cslockfull lck(m_csDbAccess);

	char *szCachedSettingName = m_cache->GetCachedSetting(dbcwWork.szModule, dbcwWork.szSetting, moduleNameLen, settingNameLen);

	// we don't cache blobs and passwords
	if (dbcwWork.value.type != DBVT_BLOB && dbcwWork.value.type != DBVT_ENCRYPTED && !bIsEncrypted) {
		DBVARIANT *pCachedValue = m_cache->GetCachedValuePtr(contactID, szCachedSettingName, 1);
		if (pCachedValue != NULL) {
			bool bIsIdentical = false;
			if (pCachedValue->type == dbcwWork.value.type) {
				switch (dbcwWork.value.type) {
				case DBVT_BYTE:   bIsIdentical = pCachedValue->bVal == dbcwWork.value.bVal;  break;
				case DBVT_WORD:   bIsIdentical = pCachedValue->wVal == dbcwWork.value.wVal;  break;
				case DBVT_DWORD:  bIsIdentical = pCachedValue->dVal == dbcwWork.value.dVal;  break;
				case DBVT_UTF8:
				case DBVT_ASCIIZ: bIsIdentical = strcmp(pCachedValue->pszVal, dbcwWork.value.pszVal) == 0; break;
				}
				if (bIsIdentical)
					return 0;
			}
			m_cache->SetCachedVariant(&dbcwWork.value, pCachedValue);
		}
		if (szCachedSettingName[-1] != 0) {
			lck.unlock();
			NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwWork);
			return 0;
		}
	}
	else m_cache->GetCachedValuePtr(contactID, szCachedSettingName, -1);

	DBSettingSortingKey keySearch;
	keySearch.dwContactID = contactID;
	keySearch.dwOfsModule = GetModuleNameOfs(dbcws->szModule);
	strncpy_s(keySearch.szSettingName, dbcws->szSetting, _TRUNCATE);

	ham_key_t key = { 2 * sizeof(DWORD) + settingNameLen, &keySearch };
	ham_record_t rec = { 0 };

	switch (dbcwWork.value.type) {
	case DBVT_BYTE:  rec.size = 2; break;
	case DBVT_WORD:  rec.size = 3; break;
	case DBVT_DWORD: rec.size = 5; break;
	
	case DBVT_ASCIIZ: 
	case DBVT_UTF8:
		rec.size = 3 + dbcwWork.value.cchVal; break;

	case DBVT_BLOB:
	case DBVT_ENCRYPTED:
		rec.size = 3 + dbcwWork.value.cpbVal; break;

	default:
		return 1;
	}

	rec.data = _alloca(rec.size);
	BYTE *pBlob = (BYTE*)rec.data;
	*pBlob++ = dbcwWork.value.type;
	switch (dbcwWork.value.type) {
	case DBVT_BYTE:  *pBlob = dbcwWork.value.bVal; break;
	case DBVT_WORD:  *(WORD*)pBlob = dbcwWork.value.wVal; break;
	case DBVT_DWORD: *(DWORD*)pBlob = dbcwWork.value.dVal; break;

	case DBVT_ASCIIZ:
	case DBVT_UTF8:
		*(WORD*)pBlob = dbcwWork.value.cchVal;
		memcpy(pBlob+2, dbcwWork.value.pszVal, dbcwWork.value.cchVal);
		break;

	case DBVT_BLOB:
	case DBVT_ENCRYPTED:
		*(WORD*)pBlob = dbcwWork.value.cpbVal;
		memcpy(pBlob+2, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
	}
	ham_db_insert(m_dbSettings, NULL, &key, &rec, HAM_OVERWRITE);
	lck.unlock();

	// notify
	NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwNotif);
	return 0;
}
Beispiel #2
0
STDMETHODIMP_(BOOL) CDb3Mmap::WriteContactSetting(MCONTACT contactID, DBCONTACTWRITESETTING *dbcws)
{
	if (dbcws == NULL || dbcws->szSetting == NULL || dbcws->szModule == NULL || m_bReadOnly)
		return 1;

	// the db format can't tolerate more than 255 bytes of space (incl. null) for settings+module name
	int settingNameLen = (int)mir_strlen(dbcws->szSetting);
	int moduleNameLen = (int)mir_strlen(dbcws->szModule);
	if (settingNameLen > 0xFE) {
#ifdef _DEBUG
		OutputDebugStringA("WriteContactSetting() got a > 255 setting name length. \n");
#endif
		return 1;
	}
	if (moduleNameLen > 0xFE) {
#ifdef _DEBUG
		OutputDebugStringA("WriteContactSetting() got a > 255 module name length. \n");
#endif
		return 1;
	}

	// used for notifications
	DBCONTACTWRITESETTING dbcwNotif = *dbcws;
	if (dbcwNotif.value.type == DBVT_WCHAR) {
		if (dbcwNotif.value.pszVal != NULL) {
			char* val = mir_utf8encodeW(dbcwNotif.value.pwszVal);
			if (val == NULL)
				return 1;

			dbcwNotif.value.pszVal = (char*)alloca(mir_strlen(val) + 1);
			mir_strcpy(dbcwNotif.value.pszVal, val);
			mir_free(val);
			dbcwNotif.value.type = DBVT_UTF8;
		}
		else return 1;
	}

	if (dbcwNotif.szModule == NULL || dbcwNotif.szSetting == NULL)
		return 1;

	DBCONTACTWRITESETTING dbcwWork = dbcwNotif;

	mir_ptr<BYTE> pEncoded(NULL);
	bool bIsEncrypted = false;
	switch (dbcwWork.value.type) {
	case DBVT_BYTE: case DBVT_WORD: case DBVT_DWORD:
		break;

	case DBVT_ASCIIZ: case DBVT_UTF8:
		bIsEncrypted = m_bEncrypted || IsSettingEncrypted(dbcws->szModule, dbcws->szSetting);
	LBL_WriteString:
		if (dbcwWork.value.pszVal == NULL)
			return 1;
		dbcwWork.value.cchVal = (WORD)mir_strlen(dbcwWork.value.pszVal);
		if (bIsEncrypted) {
			size_t len;
			BYTE *pResult = m_crypto->encodeString(dbcwWork.value.pszVal, &len);
			if (pResult != NULL) {
				pEncoded = dbcwWork.value.pbVal = pResult;
				dbcwWork.value.cpbVal = (WORD)len;
				dbcwWork.value.type = DBVT_ENCRYPTED;
			}
		}
		break;

	case DBVT_UNENCRYPTED:
		dbcwNotif.value.type = dbcwWork.value.type = DBVT_UTF8;
		goto LBL_WriteString;

	case DBVT_BLOB: case DBVT_ENCRYPTED:
		if (dbcwWork.value.pbVal == NULL)
			return 1;
		break;
	default:
		return 1;
	}

	mir_cslockfull lck(m_csDbAccess);

	DWORD ofsBlobPtr, ofsContact = GetContactOffset(contactID);
	if (ofsContact == 0) {
		_ASSERT(false); // contact doesn't exist?
		return 2;
	}

	char *szCachedSettingName = m_cache->GetCachedSetting(dbcwWork.szModule, dbcwWork.szSetting, moduleNameLen, settingNameLen);
	log3("set [%08p] %s (%p)", hContact, szCachedSettingName, szCachedSettingName);

	// we don't cache blobs and passwords
	if (dbcwWork.value.type != DBVT_BLOB && dbcwWork.value.type != DBVT_ENCRYPTED && !bIsEncrypted) {
		DBVARIANT *pCachedValue = m_cache->GetCachedValuePtr(contactID, szCachedSettingName, 1);
		if (pCachedValue != NULL) {
			bool bIsIdentical = false;
			if (pCachedValue->type == dbcwWork.value.type) {
				switch (dbcwWork.value.type) {
				case DBVT_BYTE:   bIsIdentical = pCachedValue->bVal == dbcwWork.value.bVal;  break;
				case DBVT_WORD:   bIsIdentical = pCachedValue->wVal == dbcwWork.value.wVal;  break;
				case DBVT_DWORD:  bIsIdentical = pCachedValue->dVal == dbcwWork.value.dVal;  break;
				case DBVT_UTF8:
				case DBVT_ASCIIZ: bIsIdentical = mir_strcmp(pCachedValue->pszVal, dbcwWork.value.pszVal) == 0; break;
				}
				if (bIsIdentical)
					return 0;
			}
			m_cache->SetCachedVariant(&dbcwWork.value, pCachedValue);
		}
		if (szCachedSettingName[-1] != 0) {
			lck.unlock();
			log2(" set resident as %s (%p)", printVariant(&dbcwWork.value), pCachedValue);
			NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwWork);
			return 0;
		}
	}
	else m_cache->GetCachedValuePtr(contactID, szCachedSettingName, -1);

	log1(" write database as %s", printVariant(&dbcwWork.value));

	DWORD ofsModuleName = GetModuleNameOfs(dbcwWork.szModule);
	DBContact dbc = *(DBContact*)DBRead(ofsContact, NULL);
	if (dbc.signature != DBCONTACT_SIGNATURE)
		return 1;

	// make sure the module group exists
	PBYTE pBlob;
	int bytesRequired, bytesRemaining;
	DBContactSettings dbcs;
	DWORD ofsSettingsGroup = GetSettingsGroupOfsByModuleNameOfs(&dbc, ofsModuleName);
	if (ofsSettingsGroup == 0) {  //module group didn't exist - make it
		switch (dbcwWork.value.type) {
		case DBVT_ASCIIZ: case DBVT_UTF8:
			bytesRequired = dbcwWork.value.cchVal + 2;
			break;
		case DBVT_BLOB: case DBVT_ENCRYPTED:
			bytesRequired = dbcwWork.value.cpbVal + 2;
			break;
		default:
			bytesRequired = dbcwWork.value.type;
		}
		bytesRequired += 2 + settingNameLen;
		bytesRequired += (DB_SETTINGS_RESIZE_GRANULARITY - (bytesRequired % DB_SETTINGS_RESIZE_GRANULARITY)) % DB_SETTINGS_RESIZE_GRANULARITY;
		ofsSettingsGroup = CreateNewSpace(bytesRequired + offsetof(DBContactSettings, blob));
		dbcs.signature = DBCONTACTSETTINGS_SIGNATURE;
		dbcs.ofsNext = dbc.ofsFirstSettings;
		dbcs.ofsModuleName = ofsModuleName;
		dbcs.cbBlob = bytesRequired;
		dbcs.blob[0] = 0;
		dbc.ofsFirstSettings = ofsSettingsGroup;
		DBWrite(ofsContact, &dbc, sizeof(DBContact));
		DBWrite(ofsSettingsGroup, &dbcs, sizeof(DBContactSettings));
		ofsBlobPtr = ofsSettingsGroup + offsetof(DBContactSettings, blob);
		pBlob = (PBYTE)DBRead(ofsBlobPtr, &bytesRemaining);
	}
	else {
		dbcs = *(DBContactSettings*)DBRead(ofsSettingsGroup, &bytesRemaining);

		// find if the setting exists
		ofsBlobPtr = ofsSettingsGroup + offsetof(DBContactSettings, blob);
		pBlob = (PBYTE)DBRead(ofsBlobPtr, &bytesRemaining);
		while (pBlob[0]) {
			NeedBytes(settingNameLen + 1);
			if (pBlob[0] == settingNameLen && !memcmp(pBlob + 1, dbcwWork.szSetting, settingNameLen))
				break;
			NeedBytes(1);
			MoveAlong(pBlob[0] + 1);
			NeedBytes(3);
			MoveAlong(1 + GetSettingValueLength(pBlob));
			NeedBytes(1);
		}

		// setting already existed, and up to end of name is in cache
		if (pBlob[0]) {
			MoveAlong(1 + settingNameLen);
			// if different type or variable length and length is different
			NeedBytes(3);
			if (pBlob[0] != dbcwWork.value.type ||
				((pBlob[0] == DBVT_ASCIIZ || pBlob[0] == DBVT_UTF8) && *(PWORD)(pBlob + 1) != dbcwWork.value.cchVal) ||
				((pBlob[0] == DBVT_BLOB || pBlob[0] == DBVT_ENCRYPTED) && *(PWORD)(pBlob + 1) != dbcwWork.value.cpbVal))
			{
				// bin it
				NeedBytes(3);
				int nameLen = 1 + settingNameLen;
				int valLen = 1 + GetSettingValueLength(pBlob);
				DWORD ofsSettingToCut = ofsBlobPtr - nameLen;
				MoveAlong(valLen);
				NeedBytes(1);
				while (pBlob[0]) {
					MoveAlong(pBlob[0] + 1);
					NeedBytes(3);
					MoveAlong(1 + GetSettingValueLength(pBlob));
					NeedBytes(1);
				}
				DBMoveChunk(ofsSettingToCut, ofsSettingToCut + nameLen + valLen, ofsBlobPtr + 1 - ofsSettingToCut);
				ofsBlobPtr -= nameLen + valLen;
				pBlob = (PBYTE)DBRead(ofsBlobPtr, &bytesRemaining);
			}
			else {
				// replace existing setting at pBlob
				MoveAlong(1);	// skip data type
				switch (dbcwWork.value.type) {
				case DBVT_BYTE:  DBWrite(ofsBlobPtr, &dbcwWork.value.bVal, 1); break;
				case DBVT_WORD:  DBWrite(ofsBlobPtr, &dbcwWork.value.wVal, 2); break;
				case DBVT_DWORD: DBWrite(ofsBlobPtr, &dbcwWork.value.dVal, 4); break;
				case DBVT_BLOB:
					DBWrite(ofsBlobPtr + 2, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
					break;
				case DBVT_ENCRYPTED:
					DBWrite(ofsBlobPtr + 2, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
					break;
				case DBVT_UTF8:
				case DBVT_ASCIIZ:
					DBWrite(ofsBlobPtr + 2, dbcwWork.value.pszVal, dbcwWork.value.cchVal);
					break;
				}
				// quit
				DBFlush(1);
				lck.unlock();
				// notify
				NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwNotif);
				return 0;
			}
		}
	}

	// cannot do a simple replace, add setting to end of list
	// pBlob already points to end of list
	// see if it fits
	switch (dbcwWork.value.type) {
	case DBVT_ASCIIZ: case DBVT_UTF8:
		bytesRequired = dbcwWork.value.cchVal + 2;
		break;
	case DBVT_BLOB: case DBVT_ENCRYPTED:
		bytesRequired = dbcwWork.value.cpbVal + 2;
		break;
	default:
		bytesRequired = dbcwWork.value.type;
	}

	bytesRequired += 2 + settingNameLen;
	bytesRequired += ofsBlobPtr + 1 - (ofsSettingsGroup + offsetof(DBContactSettings, blob));

	if ((DWORD)bytesRequired > dbcs.cbBlob) {
		// doesn't fit: move entire group
		DBContactSettings *dbcsPrev;
		DWORD ofsDbcsPrev, ofsNew;

		InvalidateSettingsGroupOfsCacheEntry(ofsSettingsGroup);
		bytesRequired += (DB_SETTINGS_RESIZE_GRANULARITY - (bytesRequired % DB_SETTINGS_RESIZE_GRANULARITY)) % DB_SETTINGS_RESIZE_GRANULARITY;
		// find previous group to change its offset
		ofsDbcsPrev = dbc.ofsFirstSettings;
		if (ofsDbcsPrev == ofsSettingsGroup) ofsDbcsPrev = 0;
		else {
			dbcsPrev = (DBContactSettings*)DBRead(ofsDbcsPrev, NULL);
			while (dbcsPrev->ofsNext != ofsSettingsGroup) {
				if (dbcsPrev->ofsNext == 0) DatabaseCorruption(NULL);
				ofsDbcsPrev = dbcsPrev->ofsNext;
				dbcsPrev = (DBContactSettings*)DBRead(ofsDbcsPrev, NULL);
			}
		}

		// create the new one
		ofsNew = ReallocSpace(ofsSettingsGroup, dbcs.cbBlob + offsetof(DBContactSettings, blob), bytesRequired + offsetof(DBContactSettings, blob));

		dbcs.cbBlob = bytesRequired;

		DBWrite(ofsNew, &dbcs, offsetof(DBContactSettings, blob));
		if (ofsDbcsPrev == 0) {
			dbc.ofsFirstSettings = ofsNew;
			DBWrite(ofsContact, &dbc, sizeof(DBContact));
		}
		else {
			dbcsPrev = (DBContactSettings*)DBRead(ofsDbcsPrev, NULL);
			dbcsPrev->ofsNext = ofsNew;
			DBWrite(ofsDbcsPrev, dbcsPrev, offsetof(DBContactSettings, blob));
		}
		ofsBlobPtr += ofsNew - ofsSettingsGroup;
		ofsSettingsGroup = ofsNew;
		pBlob = (PBYTE)DBRead(ofsBlobPtr, &bytesRemaining);
	}

	// we now have a place to put it and enough space: make it
	DBWrite(ofsBlobPtr, &settingNameLen, 1);
	DBWrite(ofsBlobPtr + 1, (PVOID)dbcwWork.szSetting, settingNameLen);
	MoveAlong(1 + settingNameLen);
	DBWrite(ofsBlobPtr, &dbcwWork.value.type, 1);
	MoveAlong(1);
	switch (dbcwWork.value.type) {
	case DBVT_BYTE: DBWrite(ofsBlobPtr, &dbcwWork.value.bVal, 1); MoveAlong(1); break;
	case DBVT_WORD: DBWrite(ofsBlobPtr, &dbcwWork.value.wVal, 2); MoveAlong(2); break;
	case DBVT_DWORD: DBWrite(ofsBlobPtr, &dbcwWork.value.dVal, 4); MoveAlong(4); break;

	case DBVT_BLOB:
		DBWrite(ofsBlobPtr, &dbcwWork.value.cpbVal, 2);
		DBWrite(ofsBlobPtr + 2, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
		MoveAlong(2 + dbcwWork.value.cpbVal);
		break;

	case DBVT_ENCRYPTED:
		DBWrite(ofsBlobPtr, &dbcwWork.value.cpbVal, 2);
		DBWrite(ofsBlobPtr + 2, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
		MoveAlong(2 + dbcwWork.value.cpbVal);
		break;

	case DBVT_UTF8: case DBVT_ASCIIZ:
		DBWrite(ofsBlobPtr, &dbcwWork.value.cchVal, 2);
		DBWrite(ofsBlobPtr + 2, dbcwWork.value.pszVal, dbcwWork.value.cchVal);
		MoveAlong(2 + dbcwWork.value.cchVal);
		break;
	}

	BYTE zero = 0;
	DBWrite(ofsBlobPtr, &zero, 1);

	// quit
	DBFlush(1);
	lck.unlock();

	// notify
	NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwNotif);
	return 0;
}
Beispiel #3
0
STDMETHODIMP_(BOOL) CDbxMdb::WriteContactSetting(MCONTACT contactID, DBCONTACTWRITESETTING *dbcws)
{
	if (dbcws == NULL || dbcws->szSetting == NULL || dbcws->szModule == NULL || m_bReadOnly)
		return 1;

	// the db format can't tolerate more than 255 bytes of space (incl. null) for settings+module name
	int settingNameLen = (int)strlen(dbcws->szSetting);
	int moduleNameLen = (int)strlen(dbcws->szModule);

	// used for notifications
	DBCONTACTWRITESETTING dbcwNotif = *dbcws;
	if (dbcwNotif.value.type == DBVT_WCHAR) 
	{
		if (dbcwNotif.value.pszVal != NULL) 
		{
			char* val = mir_utf8encodeW(dbcwNotif.value.pwszVal);
			if (val == NULL)
				return 1;

			dbcwNotif.value.pszVal = (char*)alloca(strlen(val) + 1);
			strcpy(dbcwNotif.value.pszVal, val);
			mir_free(val);
			dbcwNotif.value.type = DBVT_UTF8;
		}
		else return 1;
	}

	if (dbcwNotif.szModule == NULL || dbcwNotif.szSetting == NULL)
		return 1;

	DBCONTACTWRITESETTING dbcwWork = dbcwNotif;

	mir_ptr<BYTE> pEncoded(NULL);
	bool bIsEncrypted = false;
	switch (dbcwWork.value.type) {
	case DBVT_BYTE: case DBVT_WORD: case DBVT_DWORD:
		break;

	case DBVT_ASCIIZ: case DBVT_UTF8:
		bIsEncrypted = m_bEncrypted || IsSettingEncrypted(dbcws->szModule, dbcws->szSetting);
	LBL_WriteString:
		if (dbcwWork.value.pszVal == NULL)
			return 1;
		dbcwWork.value.cchVal = (WORD)strlen(dbcwWork.value.pszVal);
		if (bIsEncrypted) 
		{
			size_t len;
			BYTE *pResult = m_crypto->encodeString(dbcwWork.value.pszVal, &len);
			if (pResult != NULL) 
			{
				pEncoded = dbcwWork.value.pbVal = pResult;
				dbcwWork.value.cpbVal = (WORD)len;
				dbcwWork.value.type = DBVT_ENCRYPTED;
			}
		}
		break;

	case DBVT_UNENCRYPTED:
		dbcwNotif.value.type = dbcwWork.value.type = DBVT_UTF8;
		goto LBL_WriteString;

	case DBVT_BLOB: case DBVT_ENCRYPTED:
		if (dbcwWork.value.pbVal == NULL)
			return 1;
		break;
	default:
		return 1;
	}

	mir_cslockfull lck(m_csDbAccess);

	char *szCachedSettingName = m_cache->GetCachedSetting(dbcwWork.szModule, dbcwWork.szSetting, moduleNameLen, settingNameLen);

	// we don't cache blobs and passwords
	if (dbcwWork.value.type != DBVT_BLOB && dbcwWork.value.type != DBVT_ENCRYPTED && !bIsEncrypted) 
	{
		DBVARIANT *pCachedValue = m_cache->GetCachedValuePtr(contactID, szCachedSettingName, 1);
		if (pCachedValue != NULL) 
		{
			bool bIsIdentical = false;
			if (pCachedValue->type == dbcwWork.value.type) 
			{
				switch (dbcwWork.value.type) {
				case DBVT_BYTE:   bIsIdentical = pCachedValue->bVal == dbcwWork.value.bVal;  break;
				case DBVT_WORD:   bIsIdentical = pCachedValue->wVal == dbcwWork.value.wVal;  break;
				case DBVT_DWORD:  bIsIdentical = pCachedValue->dVal == dbcwWork.value.dVal;  break;
				case DBVT_UTF8:
				case DBVT_ASCIIZ: bIsIdentical = strcmp(pCachedValue->pszVal, dbcwWork.value.pszVal) == 0; break;
				}
				if (bIsIdentical)
					return 0;
			}
			m_cache->SetCachedVariant(&dbcwWork.value, pCachedValue);
		}
		if (szCachedSettingName[-1] != 0) 
		{
			lck.unlock();
			NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwWork);
			return 0;
		}
	}
	else m_cache->GetCachedValuePtr(contactID, szCachedSettingName, -1);

	DBSettingKey keySearch;
	keySearch.dwContactID = contactID;
	keySearch.dwOfsModule = GetModuleNameOfs(dbcws->szModule);
	strncpy_s(keySearch.szSettingName, dbcws->szSetting, _TRUNCATE);

	MDB_val key = { 2 * sizeof(DWORD) + settingNameLen, &keySearch }, data;

	switch (dbcwWork.value.type) {
	case DBVT_BYTE:  data.mv_size = 2; break;
	case DBVT_WORD:  data.mv_size = 3; break;
	case DBVT_DWORD: data.mv_size = 5; break;
	
	case DBVT_ASCIIZ: 
	case DBVT_UTF8:
		data.mv_size = 3 + dbcwWork.value.cchVal; break;

	case DBVT_BLOB:
	case DBVT_ENCRYPTED:
		data.mv_size = 3 + dbcwWork.value.cpbVal; break;
	}

	for (;; Remap()) {
		txn_ptr trnlck(m_pMdbEnv);
		MDB_CHECK(mdb_put(trnlck, m_dbSettings, &key, &data, MDB_RESERVE), 1);

		BYTE *pBlob = (BYTE*)data.mv_data;
		*pBlob++ = dbcwWork.value.type;
		switch (dbcwWork.value.type) {
		case DBVT_BYTE:  *pBlob = dbcwWork.value.bVal; break;
		case DBVT_WORD:  *(WORD*)pBlob = dbcwWork.value.wVal; break;
		case DBVT_DWORD: *(DWORD*)pBlob = dbcwWork.value.dVal; break;

		case DBVT_ASCIIZ:
		case DBVT_UTF8:
			data.mv_size = *(WORD*)pBlob = dbcwWork.value.cchVal;
			pBlob += 2;
			memcpy(pBlob, dbcwWork.value.pszVal, dbcwWork.value.cchVal);
			break;

		case DBVT_BLOB:
		case DBVT_ENCRYPTED:
			data.mv_size = *(WORD*)pBlob = dbcwWork.value.cpbVal;
			pBlob += 2;
			memcpy(pBlob, dbcwWork.value.pbVal, dbcwWork.value.cpbVal);
		}

		if (trnlck.commit())
			break;
	}
	lck.unlock();

	// notify
	NotifyEventHooks(hSettingChangeEvent, contactID, (LPARAM)&dbcwNotif);
	return 0;
}