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Telegram/SourceFiles/data/data_peer_id.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "data/data_peer_id.h"
+
+PeerId peerFromMTP(const MTPPeer &peer) {
+	return peer.match([](const MTPDpeerUser &data) {
+		return peerFromUser(data.vuser_id());
+	}, [](const MTPDpeerChat &data) {
+		return peerFromChat(data.vchat_id());
+	}, [](const MTPDpeerChannel &data) {
+		return peerFromChannel(data.vchannel_id());
+	});
+}
+
+MTPpeer peerToMTP(PeerId id) {
+	if (peerIsUser(id)) {
+		return MTP_peerUser(peerToBareMTPInt(id));
+	} else if (peerIsChat(id)) {
+		return MTP_peerChat(peerToBareMTPInt(id));
+	} else if (peerIsChannel(id)) {
+		return MTP_peerChannel(peerToBareMTPInt(id));
+	}
+	return MTP_peerUser(MTP_long(0));
+}
+
+PeerId DeserializePeerId(quint64 serialized) {
+	const auto flag = (UserId::kReservedBit << 48);
+	const auto legacy = !(serialized & (UserId::kReservedBit << 48));
+	if (!legacy) {
+		return PeerId(serialized & (~flag));
+	}
+	constexpr auto PeerIdMask = uint64(0xFFFFFFFFULL);
+	constexpr auto PeerIdTypeMask = uint64(0xF00000000ULL);
+	constexpr auto PeerIdUserShift = uint64(0x000000000ULL);
+	constexpr auto PeerIdChatShift = uint64(0x100000000ULL);
+	constexpr auto PeerIdChannelShift = uint64(0x200000000ULL);
+	constexpr auto PeerIdFakeShift = uint64(0xF00000000ULL);
+	return ((serialized & PeerIdTypeMask) == PeerIdUserShift)
+		? peerFromUser(UserId(serialized & PeerIdMask))
+		: ((serialized & PeerIdTypeMask) == PeerIdChatShift)
+		? peerFromChat(ChatId(serialized & PeerIdMask))
+		: ((serialized & PeerIdTypeMask) == PeerIdChannelShift)
+		? peerFromChannel(ChannelId(serialized & PeerIdMask))
+		: ((serialized & PeerIdTypeMask) == PeerIdFakeShift)
+		? PeerId(FakeChatId(serialized & PeerIdMask))
+		: PeerId(0);
+}
+
+quint64 SerializePeerId(PeerId id) {
+	Expects(!(id.value & (UserId::kReservedBit << 48)));
+
+	return id.value | (UserId::kReservedBit << 48);
+}