Method lockAndReadHeader

src/jrd/CryptoManager.cpp:371–441

	}

	void CryptoManager::lockAndReadHeader(thread_db* tdbb, unsigned flags)
	{
		if (flags & CRYPT_HDR_INIT)
		{
			ThreadStatusGuard guard(tdbb);
			if (LCK_lock(tdbb, stateLock, CRYPT_INIT, LCK_NO_WAIT))
			{
				LCK_write_data(tdbb, stateLock, 1);
				if (!LCK_convert(tdbb, stateLock, CRYPT_NORMAL, LCK_NO_WAIT))
				{
					fb_assert(tdbb->tdbb_status_vector->getState() & IStatus::STATE_ERRORS);
					ERR_punt();
				}
			}
			else if (!LCK_lock(tdbb, stateLock, CRYPT_NORMAL, LCK_WAIT))
			{
				fb_assert(false);
			}
		}
		else
		{
			ThreadStatusGuard guard(tdbb);
			if (!LCK_convert(tdbb, stateLock, CRYPT_NORMAL,
					(flags & CRYPT_HDR_NOWAIT) ? LCK_NO_WAIT : LCK_WAIT))
			{
				// Failed to take state lock - switch to slow IO mode
				slowIO = LCK_read_data(tdbb, stateLock);
				fb_assert(slowIO);
			}
			else
				slowIO = 0;
		}

		PhysHdr hdr(tdbb);
		crypt = hdr->hdr_flags & Ods::hdr_encrypted;
		process = hdr->hdr_flags & Ods::hdr_crypt_process;

		if (flags & CRYPT_RELOAD_PLUGIN && cryptPlugin)
		{
			PluginManagerInterfacePtr()->releasePlugin(cryptPlugin);
			cryptPlugin = NULL;
		}

		// tdbb w/o attachment comes when database is shutting down in the end of detachDatabase()
		// the only needed here page is header, i.e. we can live w/o cryptPlugin
		if ((crypt || process) && !cryptPlugin && tdbb->getAttachment())
		{
			ClumpletWriter hc(ClumpletWriter::UnTagged, hdr->hdr_page_size);
			hdr.getClumplets(hc);
			if (hc.find(Ods::HDR_crypt_key))
				hc.getString(keyName);
			else
				keyName = "";

			loadPlugin(tdbb, hdr->hdr_crypt_plugin);
			pluginName = hdr->hdr_crypt_plugin;
			string valid;
			calcValidation(valid, cryptPlugin);