diff options
Diffstat (limited to 'src/serialize.h')
| -rw-r--r-- | src/serialize.h | 153 |
1 files changed, 59 insertions, 94 deletions
diff --git a/src/serialize.h b/src/serialize.h index fe53eeed31..71c2cfa164 100644 --- a/src/serialize.h +++ b/src/serialize.h @@ -43,26 +43,6 @@ static const unsigned int MAX_VECTOR_ALLOCATE = 5000000; struct deserialize_type {}; constexpr deserialize_type deserialize {}; -/** - * Used to bypass the rule against non-const reference to temporary - * where it makes sense with wrappers. - */ -template<typename T> -inline T& REF(const T& val) -{ - return const_cast<T&>(val); -} - -/** - * Used to acquire a non-const pointer "this" to generate bodies - * of const serialization operations from a template - */ -template<typename T> -inline T* NCONST_PTR(const T* val) -{ - return const_cast<T*>(val); -} - //! Safely convert odd char pointer types to standard ones. inline char* CharCast(char* c) { return c; } inline char* CharCast(unsigned char* c) { return (char*)c; } @@ -190,22 +170,8 @@ template<typename X> const X& ReadWriteAsHelper(const X& x) { return x; } #define READWRITE(...) (::SerReadWriteMany(s, ser_action, __VA_ARGS__)) #define READWRITEAS(type, obj) (::SerReadWriteMany(s, ser_action, ReadWriteAsHelper<type>(obj))) - -/** - * Implement three methods for serializable objects. These are actually wrappers over - * "SerializationOp" template, which implements the body of each class' serialization - * code. Adding "ADD_SERIALIZE_METHODS" in the body of the class causes these wrappers to be - * added as members. - */ -#define ADD_SERIALIZE_METHODS \ - template<typename Stream> \ - void Serialize(Stream& s) const { \ - NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize()); \ - } \ - template<typename Stream> \ - void Unserialize(Stream& s) { \ - SerializationOp(s, CSerActionUnserialize()); \ - } +#define SER_READ(obj, code) ::SerRead(s, ser_action, obj, [&](Stream& s, typename std::remove_const<Type>::type& obj) { code; }) +#define SER_WRITE(obj, code) ::SerWrite(s, ser_action, obj, [&](Stream& s, const Type& obj) { code; }) /** * Implement the Ser and Unser methods needed for implementing a formatter (see Using below). @@ -501,7 +467,7 @@ static inline Wrapper<Formatter, T&> Using(T&& t) { return Wrapper<Formatter, T& #define VARINT_MODE(obj, mode) Using<VarIntFormatter<mode>>(obj) #define VARINT(obj) Using<VarIntFormatter<VarIntMode::DEFAULT>>(obj) #define COMPACTSIZE(obj) Using<CompactSizeFormatter>(obj) -#define LIMITED_STRING(obj,n) LimitedString< n >(REF(obj)) +#define LIMITED_STRING(obj,n) Using<LimitedStringFormatter<n>>(obj) /** Serialization wrapper class for integers in VarInt format. */ template<VarIntMode Mode> @@ -518,7 +484,16 @@ struct VarIntFormatter } }; -template<int Bytes> +/** Serialization wrapper class for custom integers and enums. + * + * It permits specifying the serialized size (1 to 8 bytes) and endianness. + * + * Use the big endian mode for values that are stored in memory in native + * byte order, but serialized in big endian notation. This is only intended + * to implement serializers that are compatible with existing formats, and + * its use is not recommended for new data structures. + */ +template<int Bytes, bool BigEndian = false> struct CustomUintFormatter { static_assert(Bytes > 0 && Bytes <= 8, "CustomUintFormatter Bytes out of range"); @@ -527,52 +502,31 @@ struct CustomUintFormatter template <typename Stream, typename I> void Ser(Stream& s, I v) { if (v < 0 || v > MAX) throw std::ios_base::failure("CustomUintFormatter value out of range"); - uint64_t raw = htole64(v); - s.write((const char*)&raw, Bytes); + if (BigEndian) { + uint64_t raw = htobe64(v); + s.write(((const char*)&raw) + 8 - Bytes, Bytes); + } else { + uint64_t raw = htole64(v); + s.write((const char*)&raw, Bytes); + } } template <typename Stream, typename I> void Unser(Stream& s, I& v) { - static_assert(std::numeric_limits<I>::max() >= MAX && std::numeric_limits<I>::min() <= 0, "CustomUintFormatter type too small"); + using U = typename std::conditional<std::is_enum<I>::value, std::underlying_type<I>, std::common_type<I>>::type::type; + static_assert(std::numeric_limits<U>::max() >= MAX && std::numeric_limits<U>::min() <= 0, "Assigned type too small"); uint64_t raw = 0; - s.read((char*)&raw, Bytes); - v = le64toh(raw); + if (BigEndian) { + s.read(((char*)&raw) + 8 - Bytes, Bytes); + v = static_cast<I>(be64toh(raw)); + } else { + s.read((char*)&raw, Bytes); + v = static_cast<I>(le64toh(raw)); + } } }; -/** Serialization wrapper class for big-endian integers. - * - * Use this wrapper around integer types that are stored in memory in native - * byte order, but serialized in big endian notation. This is only intended - * to implement serializers that are compatible with existing formats, and - * its use is not recommended for new data structures. - * - * Only 16-bit types are supported for now. - */ -template<typename I> -class BigEndian -{ -protected: - I& m_val; -public: - explicit BigEndian(I& val) : m_val(val) - { - static_assert(std::is_unsigned<I>::value, "BigEndian type must be unsigned integer"); - static_assert(sizeof(I) == 2 && std::numeric_limits<I>::min() == 0 && std::numeric_limits<I>::max() == std::numeric_limits<uint16_t>::max(), "Unsupported BigEndian size"); - } - - template<typename Stream> - void Serialize(Stream& s) const - { - ser_writedata16be(s, m_val); - } - - template<typename Stream> - void Unserialize(Stream& s) - { - m_val = ser_readdata16be(s); - } -}; +template<int Bytes> using BigEndianFormatter = CustomUintFormatter<Bytes, true>; /** Formatter for integers in CompactSize format. */ struct CompactSizeFormatter @@ -598,37 +552,26 @@ struct CompactSizeFormatter }; template<size_t Limit> -class LimitedString +struct LimitedStringFormatter { -protected: - std::string& string; -public: - explicit LimitedString(std::string& _string) : string(_string) {} - template<typename Stream> - void Unserialize(Stream& s) + void Unser(Stream& s, std::string& v) { size_t size = ReadCompactSize(s); if (size > Limit) { throw std::ios_base::failure("String length limit exceeded"); } - string.resize(size); - if (size != 0) - s.read((char*)string.data(), size); + v.resize(size); + if (size != 0) s.read((char*)v.data(), size); } template<typename Stream> - void Serialize(Stream& s) const + void Ser(Stream& s, const std::string& v) { - WriteCompactSize(s, string.size()); - if (!string.empty()) - s.write((char*)string.data(), string.size()); + s << v; } }; -template<typename I> -BigEndian<I> WrapBigEndian(I& n) { return BigEndian<I>(n); } - /** Formatter to serialize/deserialize vector elements using another formatter * * Example: @@ -1025,7 +968,7 @@ void Unserialize(Stream& is, std::shared_ptr<const T>& p) /** - * Support for ADD_SERIALIZE_METHODS and READWRITE macro + * Support for SERIALIZE_METHODS and READWRITE macro. */ struct CSerActionSerialize { @@ -1124,6 +1067,28 @@ inline void SerReadWriteMany(Stream& s, CSerActionUnserialize ser_action, Args&& ::UnserializeMany(s, args...); } +template<typename Stream, typename Type, typename Fn> +inline void SerRead(Stream& s, CSerActionSerialize ser_action, Type&&, Fn&&) +{ +} + +template<typename Stream, typename Type, typename Fn> +inline void SerRead(Stream& s, CSerActionUnserialize ser_action, Type&& obj, Fn&& fn) +{ + fn(s, std::forward<Type>(obj)); +} + +template<typename Stream, typename Type, typename Fn> +inline void SerWrite(Stream& s, CSerActionSerialize ser_action, Type&& obj, Fn&& fn) +{ + fn(s, std::forward<Type>(obj)); +} + +template<typename Stream, typename Type, typename Fn> +inline void SerWrite(Stream& s, CSerActionUnserialize ser_action, Type&&, Fn&&) +{ +} + template<typename I> inline void WriteVarInt(CSizeComputer &s, I n) { |