Function tryParseCacheFileName

src/Storages/DiskCache/KeyIndexFileCache.cpp:56–68

    }

    bool tryParseCacheFileName(const String & file_name, String & key, UInt64 & file_size)
    {
        if (!endsWith(file_name, ".idx"))
            return false;
        String escaped_key;
        ReadBufferFromString buf(file_name);
        readIntText(file_size, buf);
        assertChar('_', buf);
        readStringUntilEOF(escaped_key, buf);
        escaped_key.resize(escaped_key.size() - 4); /// remove ".idx" tail
        key = unescapeForFileName(escaped_key);
        return true;
    }

    enum class CacheState
    {