Method writeStickerSets

Telegram/SourceFiles/storage/storage_account.cpp:1941–2041

// CheckSet is a functor on Data::StickersSet, which returns a StickerSetCheckResult.
template <typename CheckSet>
void Account::writeStickerSets(
		FileKey &stickersKey,
		CheckSet checkSet,
		const Data::StickersSetsOrder &order) {
	using SetFlag = Data::StickersSetFlag;

	const auto &sets = _owner->session().data().stickers().sets();
	if (sets.empty()) {
		if (stickersKey) {
			ClearKey(stickersKey, _basePath);
			stickersKey = 0;
			writeMapDelayed();
		}
		return;
	}

	// versionTag + version + count
	quint32 size = sizeof(quint32) + sizeof(qint32) + sizeof(qint32);

	int32 setsCount = 0;
	for (const auto &[id, set] : sets) {
		const auto raw = set.get();
		auto result = checkSet(*raw);
		if (result == StickerSetCheckResult::Abort) {
			return;
		} else if (result == StickerSetCheckResult::Skip) {
			continue;
		}

		// id
		// + accessHash
		// + hash
		// + title
		// + shortName
		// + stickersCount
		// + flags
		// + installDate
		// + thumbnailDocumentId
		// + thumbnailType
		// + thumbnailLocation
		size += sizeof(quint64) * 3
			+ Serialize::stringSize(raw->title)
			+ Serialize::stringSize(raw->shortName)
			+ sizeof(qint32) * 3
			+ sizeof(quint64)
			+ sizeof(qint32)
			+ Serialize::imageLocationSize(raw->thumbnailLocation());
		if (raw->flags & SetFlag::NotLoaded) {
			continue;
		}

		for (const auto sticker : std::as_const(raw->stickers)) {
			size += Serialize::Document::sizeInStream(sticker);
		}

		size += sizeof(qint32); // datesCount
		if (!raw->dates.empty()) {
			Assert(raw->stickers.size() == raw->dates.size());