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727857d12d
353f376277Convert blockencodings.h to new serialization framework (Pieter Wuille)e574fff53eAdd CustomUintFormatter (Pieter Wuille)10633398f2Add DifferenceFormatter (Russell Yanofsky)56dd9f04c7Make VectorFormatter support stateful formatters (Russell Yanofsky)3ca574cef0Convert CCompactSize to proper formatter (Pieter Wuille) Pull request description: This is probably the most involved change in the sequence of changes extracted from #10785. In order to implement the differential encoding of BIP152, this change changes `VectorFormatter` to permit a stateful sub-formatter, which is then used by `DifferenceFormatter`. A `CustomUintFormatter` is added as well to do the 48-bit serialization of short ids. ACKs for top commit: laanwj: ACK353f376277, nice change ryanofsky: Code review ACK353f376277. Only changes since last review are suggested assert change and MASK->MAX rename Tree-SHA512: 976618991a8be62ba0738725b7cfa166a56cde998ebf1031ba6f28557032f1577b666ac7ae25cd498c0e1e740108c3c56a342620b724df41d6cc9d8bdafac037
1152 lines
37 KiB
C++
1152 lines
37 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2019 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_SERIALIZE_H
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#define BITCOIN_SERIALIZE_H
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#include <compat/endian.h>
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#include <algorithm>
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#include <cstring>
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#include <ios>
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#include <limits>
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#include <map>
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#include <memory>
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#include <set>
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#include <stdint.h>
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#include <string>
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#include <string.h>
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#include <utility>
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#include <vector>
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#include <prevector.h>
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#include <span.h>
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static const unsigned int MAX_SIZE = 0x02000000;
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/** Maximum amount of memory (in bytes) to allocate at once when deserializing vectors. */
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static const unsigned int MAX_VECTOR_ALLOCATE = 5000000;
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/**
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* Dummy data type to identify deserializing constructors.
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*
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* By convention, a constructor of a type T with signature
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*
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* template <typename Stream> T::T(deserialize_type, Stream& s)
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*
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* is a deserializing constructor, which builds the type by
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* deserializing it from s. If T contains const fields, this
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* is likely the only way to do so.
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*/
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struct deserialize_type {};
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constexpr deserialize_type deserialize {};
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/**
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* Used to bypass the rule against non-const reference to temporary
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* where it makes sense with wrappers.
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*/
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template<typename T>
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inline T& REF(const T& val)
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{
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return const_cast<T&>(val);
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}
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/**
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* Used to acquire a non-const pointer "this" to generate bodies
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* of const serialization operations from a template
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*/
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template<typename T>
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inline T* NCONST_PTR(const T* val)
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{
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return const_cast<T*>(val);
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}
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//! Safely convert odd char pointer types to standard ones.
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inline char* CharCast(char* c) { return c; }
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inline char* CharCast(unsigned char* c) { return (char*)c; }
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inline const char* CharCast(const char* c) { return c; }
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inline const char* CharCast(const unsigned char* c) { return (const char*)c; }
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/*
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* Lowest-level serialization and conversion.
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* @note Sizes of these types are verified in the tests
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*/
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template<typename Stream> inline void ser_writedata8(Stream &s, uint8_t obj)
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{
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s.write((char*)&obj, 1);
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}
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template<typename Stream> inline void ser_writedata16(Stream &s, uint16_t obj)
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{
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obj = htole16(obj);
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s.write((char*)&obj, 2);
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}
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template<typename Stream> inline void ser_writedata16be(Stream &s, uint16_t obj)
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{
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obj = htobe16(obj);
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s.write((char*)&obj, 2);
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}
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template<typename Stream> inline void ser_writedata32(Stream &s, uint32_t obj)
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{
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obj = htole32(obj);
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s.write((char*)&obj, 4);
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}
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template<typename Stream> inline void ser_writedata32be(Stream &s, uint32_t obj)
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{
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obj = htobe32(obj);
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s.write((char*)&obj, 4);
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}
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template<typename Stream> inline void ser_writedata64(Stream &s, uint64_t obj)
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{
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obj = htole64(obj);
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s.write((char*)&obj, 8);
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}
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template<typename Stream> inline uint8_t ser_readdata8(Stream &s)
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{
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uint8_t obj;
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s.read((char*)&obj, 1);
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return obj;
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}
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template<typename Stream> inline uint16_t ser_readdata16(Stream &s)
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{
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uint16_t obj;
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s.read((char*)&obj, 2);
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return le16toh(obj);
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}
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template<typename Stream> inline uint16_t ser_readdata16be(Stream &s)
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{
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uint16_t obj;
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s.read((char*)&obj, 2);
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return be16toh(obj);
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}
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template<typename Stream> inline uint32_t ser_readdata32(Stream &s)
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{
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uint32_t obj;
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s.read((char*)&obj, 4);
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return le32toh(obj);
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}
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template<typename Stream> inline uint32_t ser_readdata32be(Stream &s)
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{
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uint32_t obj;
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s.read((char*)&obj, 4);
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return be32toh(obj);
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}
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template<typename Stream> inline uint64_t ser_readdata64(Stream &s)
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{
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uint64_t obj;
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s.read((char*)&obj, 8);
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return le64toh(obj);
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}
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inline uint64_t ser_double_to_uint64(double x)
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{
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uint64_t tmp;
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std::memcpy(&tmp, &x, sizeof(x));
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static_assert(sizeof(tmp) == sizeof(x), "double and uint64_t assumed to have the same size");
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return tmp;
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}
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inline uint32_t ser_float_to_uint32(float x)
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{
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uint32_t tmp;
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std::memcpy(&tmp, &x, sizeof(x));
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static_assert(sizeof(tmp) == sizeof(x), "float and uint32_t assumed to have the same size");
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return tmp;
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}
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inline double ser_uint64_to_double(uint64_t y)
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{
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double tmp;
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std::memcpy(&tmp, &y, sizeof(y));
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static_assert(sizeof(tmp) == sizeof(y), "double and uint64_t assumed to have the same size");
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return tmp;
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}
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inline float ser_uint32_to_float(uint32_t y)
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{
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float tmp;
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std::memcpy(&tmp, &y, sizeof(y));
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static_assert(sizeof(tmp) == sizeof(y), "float and uint32_t assumed to have the same size");
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return tmp;
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}
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/////////////////////////////////////////////////////////////////
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//
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// Templates for serializing to anything that looks like a stream,
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// i.e. anything that supports .read(char*, size_t) and .write(char*, size_t)
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//
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class CSizeComputer;
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enum
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{
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// primary actions
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SER_NETWORK = (1 << 0),
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SER_DISK = (1 << 1),
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SER_GETHASH = (1 << 2),
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};
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//! Convert the reference base type to X, without changing constness or reference type.
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template<typename X> X& ReadWriteAsHelper(X& x) { return x; }
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template<typename X> const X& ReadWriteAsHelper(const X& x) { return x; }
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#define READWRITE(...) (::SerReadWriteMany(s, ser_action, __VA_ARGS__))
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#define READWRITEAS(type, obj) (::SerReadWriteMany(s, ser_action, ReadWriteAsHelper<type>(obj)))
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/**
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* Implement three methods for serializable objects. These are actually wrappers over
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* "SerializationOp" template, which implements the body of each class' serialization
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* code. Adding "ADD_SERIALIZE_METHODS" in the body of the class causes these wrappers to be
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* added as members.
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*/
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#define ADD_SERIALIZE_METHODS \
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template<typename Stream> \
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void Serialize(Stream& s) const { \
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NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize()); \
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} \
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template<typename Stream> \
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void Unserialize(Stream& s) { \
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SerializationOp(s, CSerActionUnserialize()); \
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}
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/**
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* Implement the Ser and Unser methods needed for implementing a formatter (see Using below).
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*
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* Both Ser and Unser are delegated to a single static method SerializationOps, which is polymorphic
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* in the serialized/deserialized type (allowing it to be const when serializing, and non-const when
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* deserializing).
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*
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* Example use:
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* struct FooFormatter {
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* FORMATTER_METHODS(Class, obj) { READWRITE(obj.val1, VARINT(obj.val2)); }
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* }
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* would define a class FooFormatter that defines a serialization of Class objects consisting
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* of serializing its val1 member using the default serialization, and its val2 member using
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* VARINT serialization. That FooFormatter can then be used in statements like
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* READWRITE(Using<FooFormatter>(obj.bla)).
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*/
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#define FORMATTER_METHODS(cls, obj) \
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template<typename Stream> \
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static void Ser(Stream& s, const cls& obj) { SerializationOps(obj, s, CSerActionSerialize()); } \
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template<typename Stream> \
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static void Unser(Stream& s, cls& obj) { SerializationOps(obj, s, CSerActionUnserialize()); } \
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template<typename Stream, typename Type, typename Operation> \
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static inline void SerializationOps(Type& obj, Stream& s, Operation ser_action) \
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/**
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* Implement the Serialize and Unserialize methods by delegating to a single templated
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* static method that takes the to-be-(de)serialized object as a parameter. This approach
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* has the advantage that the constness of the object becomes a template parameter, and
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* thus allows a single implementation that sees the object as const for serializing
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* and non-const for deserializing, without casts.
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*/
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#define SERIALIZE_METHODS(cls, obj) \
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template<typename Stream> \
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void Serialize(Stream& s) const \
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{ \
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static_assert(std::is_same<const cls&, decltype(*this)>::value, "Serialize type mismatch"); \
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Ser(s, *this); \
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} \
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template<typename Stream> \
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void Unserialize(Stream& s) \
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{ \
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static_assert(std::is_same<cls&, decltype(*this)>::value, "Unserialize type mismatch"); \
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Unser(s, *this); \
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} \
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FORMATTER_METHODS(cls, obj)
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#ifndef CHAR_EQUALS_INT8
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template<typename Stream> inline void Serialize(Stream& s, char a ) { ser_writedata8(s, a); } // TODO Get rid of bare char
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#endif
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template<typename Stream> inline void Serialize(Stream& s, int8_t a ) { ser_writedata8(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, uint8_t a ) { ser_writedata8(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, int16_t a ) { ser_writedata16(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, uint16_t a) { ser_writedata16(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, int32_t a ) { ser_writedata32(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, uint32_t a) { ser_writedata32(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, int64_t a ) { ser_writedata64(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, uint64_t a) { ser_writedata64(s, a); }
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template<typename Stream> inline void Serialize(Stream& s, float a ) { ser_writedata32(s, ser_float_to_uint32(a)); }
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template<typename Stream> inline void Serialize(Stream& s, double a ) { ser_writedata64(s, ser_double_to_uint64(a)); }
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template<typename Stream, int N> inline void Serialize(Stream& s, const char (&a)[N]) { s.write(a, N); }
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template<typename Stream, int N> inline void Serialize(Stream& s, const unsigned char (&a)[N]) { s.write(CharCast(a), N); }
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template<typename Stream> inline void Serialize(Stream& s, const Span<const unsigned char>& span) { s.write(CharCast(span.data()), span.size()); }
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template<typename Stream> inline void Serialize(Stream& s, const Span<unsigned char>& span) { s.write(CharCast(span.data()), span.size()); }
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#ifndef CHAR_EQUALS_INT8
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template<typename Stream> inline void Unserialize(Stream& s, char& a ) { a = ser_readdata8(s); } // TODO Get rid of bare char
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#endif
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template<typename Stream> inline void Unserialize(Stream& s, int8_t& a ) { a = ser_readdata8(s); }
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template<typename Stream> inline void Unserialize(Stream& s, uint8_t& a ) { a = ser_readdata8(s); }
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template<typename Stream> inline void Unserialize(Stream& s, int16_t& a ) { a = ser_readdata16(s); }
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template<typename Stream> inline void Unserialize(Stream& s, uint16_t& a) { a = ser_readdata16(s); }
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template<typename Stream> inline void Unserialize(Stream& s, int32_t& a ) { a = ser_readdata32(s); }
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template<typename Stream> inline void Unserialize(Stream& s, uint32_t& a) { a = ser_readdata32(s); }
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template<typename Stream> inline void Unserialize(Stream& s, int64_t& a ) { a = ser_readdata64(s); }
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template<typename Stream> inline void Unserialize(Stream& s, uint64_t& a) { a = ser_readdata64(s); }
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template<typename Stream> inline void Unserialize(Stream& s, float& a ) { a = ser_uint32_to_float(ser_readdata32(s)); }
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template<typename Stream> inline void Unserialize(Stream& s, double& a ) { a = ser_uint64_to_double(ser_readdata64(s)); }
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template<typename Stream, int N> inline void Unserialize(Stream& s, char (&a)[N]) { s.read(a, N); }
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template<typename Stream, int N> inline void Unserialize(Stream& s, unsigned char (&a)[N]) { s.read(CharCast(a), N); }
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template<typename Stream> inline void Unserialize(Stream& s, Span<unsigned char>& span) { s.read(CharCast(span.data()), span.size()); }
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template<typename Stream> inline void Serialize(Stream& s, bool a) { char f=a; ser_writedata8(s, f); }
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template<typename Stream> inline void Unserialize(Stream& s, bool& a) { char f=ser_readdata8(s); a=f; }
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/**
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* Compact Size
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* size < 253 -- 1 byte
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* size <= USHRT_MAX -- 3 bytes (253 + 2 bytes)
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* size <= UINT_MAX -- 5 bytes (254 + 4 bytes)
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* size > UINT_MAX -- 9 bytes (255 + 8 bytes)
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*/
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inline unsigned int GetSizeOfCompactSize(uint64_t nSize)
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{
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if (nSize < 253) return sizeof(unsigned char);
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else if (nSize <= std::numeric_limits<unsigned short>::max()) return sizeof(unsigned char) + sizeof(unsigned short);
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else if (nSize <= std::numeric_limits<unsigned int>::max()) return sizeof(unsigned char) + sizeof(unsigned int);
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else return sizeof(unsigned char) + sizeof(uint64_t);
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}
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inline void WriteCompactSize(CSizeComputer& os, uint64_t nSize);
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template<typename Stream>
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void WriteCompactSize(Stream& os, uint64_t nSize)
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{
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if (nSize < 253)
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{
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ser_writedata8(os, nSize);
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}
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else if (nSize <= std::numeric_limits<unsigned short>::max())
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{
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ser_writedata8(os, 253);
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ser_writedata16(os, nSize);
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}
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else if (nSize <= std::numeric_limits<unsigned int>::max())
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{
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ser_writedata8(os, 254);
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ser_writedata32(os, nSize);
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}
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else
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{
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ser_writedata8(os, 255);
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ser_writedata64(os, nSize);
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}
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return;
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}
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template<typename Stream>
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uint64_t ReadCompactSize(Stream& is)
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{
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uint8_t chSize = ser_readdata8(is);
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uint64_t nSizeRet = 0;
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if (chSize < 253)
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{
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nSizeRet = chSize;
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}
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else if (chSize == 253)
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{
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nSizeRet = ser_readdata16(is);
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if (nSizeRet < 253)
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throw std::ios_base::failure("non-canonical ReadCompactSize()");
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}
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else if (chSize == 254)
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{
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nSizeRet = ser_readdata32(is);
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if (nSizeRet < 0x10000u)
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throw std::ios_base::failure("non-canonical ReadCompactSize()");
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}
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else
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{
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nSizeRet = ser_readdata64(is);
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if (nSizeRet < 0x100000000ULL)
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throw std::ios_base::failure("non-canonical ReadCompactSize()");
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}
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if (nSizeRet > (uint64_t)MAX_SIZE)
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throw std::ios_base::failure("ReadCompactSize(): size too large");
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return nSizeRet;
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}
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/**
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* Variable-length integers: bytes are a MSB base-128 encoding of the number.
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* The high bit in each byte signifies whether another digit follows. To make
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* sure the encoding is one-to-one, one is subtracted from all but the last digit.
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* Thus, the byte sequence a[] with length len, where all but the last byte
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* has bit 128 set, encodes the number:
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*
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* (a[len-1] & 0x7F) + sum(i=1..len-1, 128^i*((a[len-i-1] & 0x7F)+1))
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*
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* Properties:
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* * Very small (0-127: 1 byte, 128-16511: 2 bytes, 16512-2113663: 3 bytes)
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* * Every integer has exactly one encoding
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* * Encoding does not depend on size of original integer type
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* * No redundancy: every (infinite) byte sequence corresponds to a list
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* of encoded integers.
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*
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* 0: [0x00] 256: [0x81 0x00]
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* 1: [0x01] 16383: [0xFE 0x7F]
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* 127: [0x7F] 16384: [0xFF 0x00]
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* 128: [0x80 0x00] 16511: [0xFF 0x7F]
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* 255: [0x80 0x7F] 65535: [0x82 0xFE 0x7F]
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* 2^32: [0x8E 0xFE 0xFE 0xFF 0x00]
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*/
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/**
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* Mode for encoding VarInts.
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*
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* Currently there is no support for signed encodings. The default mode will not
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* compile with signed values, and the legacy "nonnegative signed" mode will
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* accept signed values, but improperly encode and decode them if they are
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* negative. In the future, the DEFAULT mode could be extended to support
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* negative numbers in a backwards compatible way, and additional modes could be
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* added to support different varint formats (e.g. zigzag encoding).
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*/
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enum class VarIntMode { DEFAULT, NONNEGATIVE_SIGNED };
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template <VarIntMode Mode, typename I>
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struct CheckVarIntMode {
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constexpr CheckVarIntMode()
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{
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static_assert(Mode != VarIntMode::DEFAULT || std::is_unsigned<I>::value, "Unsigned type required with mode DEFAULT.");
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static_assert(Mode != VarIntMode::NONNEGATIVE_SIGNED || std::is_signed<I>::value, "Signed type required with mode NONNEGATIVE_SIGNED.");
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}
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};
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template<VarIntMode Mode, typename I>
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inline unsigned int GetSizeOfVarInt(I n)
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{
|
|
CheckVarIntMode<Mode, I>();
|
|
int nRet = 0;
|
|
while(true) {
|
|
nRet++;
|
|
if (n <= 0x7F)
|
|
break;
|
|
n = (n >> 7) - 1;
|
|
}
|
|
return nRet;
|
|
}
|
|
|
|
template<typename I>
|
|
inline void WriteVarInt(CSizeComputer& os, I n);
|
|
|
|
template<typename Stream, VarIntMode Mode, typename I>
|
|
void WriteVarInt(Stream& os, I n)
|
|
{
|
|
CheckVarIntMode<Mode, I>();
|
|
unsigned char tmp[(sizeof(n)*8+6)/7];
|
|
int len=0;
|
|
while(true) {
|
|
tmp[len] = (n & 0x7F) | (len ? 0x80 : 0x00);
|
|
if (n <= 0x7F)
|
|
break;
|
|
n = (n >> 7) - 1;
|
|
len++;
|
|
}
|
|
do {
|
|
ser_writedata8(os, tmp[len]);
|
|
} while(len--);
|
|
}
|
|
|
|
template<typename Stream, VarIntMode Mode, typename I>
|
|
I ReadVarInt(Stream& is)
|
|
{
|
|
CheckVarIntMode<Mode, I>();
|
|
I n = 0;
|
|
while(true) {
|
|
unsigned char chData = ser_readdata8(is);
|
|
if (n > (std::numeric_limits<I>::max() >> 7)) {
|
|
throw std::ios_base::failure("ReadVarInt(): size too large");
|
|
}
|
|
n = (n << 7) | (chData & 0x7F);
|
|
if (chData & 0x80) {
|
|
if (n == std::numeric_limits<I>::max()) {
|
|
throw std::ios_base::failure("ReadVarInt(): size too large");
|
|
}
|
|
n++;
|
|
} else {
|
|
return n;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Simple wrapper class to serialize objects using a formatter; used by Using(). */
|
|
template<typename Formatter, typename T>
|
|
class Wrapper
|
|
{
|
|
static_assert(std::is_lvalue_reference<T>::value, "Wrapper needs an lvalue reference type T");
|
|
protected:
|
|
T m_object;
|
|
public:
|
|
explicit Wrapper(T obj) : m_object(obj) {}
|
|
template<typename Stream> void Serialize(Stream &s) const { Formatter().Ser(s, m_object); }
|
|
template<typename Stream> void Unserialize(Stream &s) { Formatter().Unser(s, m_object); }
|
|
};
|
|
|
|
/** Cause serialization/deserialization of an object to be done using a specified formatter class.
|
|
*
|
|
* To use this, you need a class Formatter that has public functions Ser(stream, const object&) for
|
|
* serialization, and Unser(stream, object&) for deserialization. Serialization routines (inside
|
|
* READWRITE, or directly with << and >> operators), can then use Using<Formatter>(object).
|
|
*
|
|
* This works by constructing a Wrapper<Formatter, T>-wrapped version of object, where T is
|
|
* const during serialization, and non-const during deserialization, which maintains const
|
|
* correctness.
|
|
*/
|
|
template<typename Formatter, typename T>
|
|
static inline Wrapper<Formatter, T&> Using(T&& t) { return Wrapper<Formatter, T&>(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))
|
|
|
|
/** Serialization wrapper class for integers in VarInt format. */
|
|
template<VarIntMode Mode>
|
|
struct VarIntFormatter
|
|
{
|
|
template<typename Stream, typename I> void Ser(Stream &s, I v)
|
|
{
|
|
WriteVarInt<Stream,Mode,typename std::remove_cv<I>::type>(s, v);
|
|
}
|
|
|
|
template<typename Stream, typename I> void Unser(Stream& s, I& v)
|
|
{
|
|
v = ReadVarInt<Stream,Mode,typename std::remove_cv<I>::type>(s);
|
|
}
|
|
};
|
|
|
|
template<int Bytes>
|
|
struct CustomUintFormatter
|
|
{
|
|
static_assert(Bytes > 0 && Bytes <= 8, "CustomUintFormatter Bytes out of range");
|
|
static constexpr uint64_t MAX = 0xffffffffffffffff >> (8 * (8 - Bytes));
|
|
|
|
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);
|
|
}
|
|
|
|
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");
|
|
uint64_t raw = 0;
|
|
s.read((char*)&raw, Bytes);
|
|
v = 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);
|
|
}
|
|
};
|
|
|
|
/** Formatter for integers in CompactSize format. */
|
|
struct CompactSizeFormatter
|
|
{
|
|
template<typename Stream, typename I>
|
|
void Unser(Stream& s, I& v)
|
|
{
|
|
uint64_t n = ReadCompactSize<Stream>(s);
|
|
if (n < std::numeric_limits<I>::min() || n > std::numeric_limits<I>::max()) {
|
|
throw std::ios_base::failure("CompactSize exceeds limit of type");
|
|
}
|
|
v = n;
|
|
}
|
|
|
|
template<typename Stream, typename I>
|
|
void Ser(Stream& s, I v)
|
|
{
|
|
static_assert(std::is_unsigned<I>::value, "CompactSize only supported for unsigned integers");
|
|
static_assert(std::numeric_limits<I>::max() <= std::numeric_limits<uint64_t>::max(), "CompactSize only supports 64-bit integers and below");
|
|
|
|
WriteCompactSize<Stream>(s, v);
|
|
}
|
|
};
|
|
|
|
template<size_t Limit>
|
|
class LimitedString
|
|
{
|
|
protected:
|
|
std::string& string;
|
|
public:
|
|
explicit LimitedString(std::string& _string) : string(_string) {}
|
|
|
|
template<typename Stream>
|
|
void Unserialize(Stream& s)
|
|
{
|
|
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);
|
|
}
|
|
|
|
template<typename Stream>
|
|
void Serialize(Stream& s) const
|
|
{
|
|
WriteCompactSize(s, string.size());
|
|
if (!string.empty())
|
|
s.write((char*)string.data(), string.size());
|
|
}
|
|
};
|
|
|
|
template<typename I>
|
|
BigEndian<I> WrapBigEndian(I& n) { return BigEndian<I>(n); }
|
|
|
|
/** Formatter to serialize/deserialize vector elements using another formatter
|
|
*
|
|
* Example:
|
|
* struct X {
|
|
* std::vector<uint64_t> v;
|
|
* SERIALIZE_METHODS(X, obj) { READWRITE(Using<VectorFormatter<VarInt>>(obj.v)); }
|
|
* };
|
|
* will define a struct that contains a vector of uint64_t, which is serialized
|
|
* as a vector of VarInt-encoded integers.
|
|
*
|
|
* V is not required to be an std::vector type. It works for any class that
|
|
* exposes a value_type, size, reserve, emplace_back, back, and const iterators.
|
|
*/
|
|
template<class Formatter>
|
|
struct VectorFormatter
|
|
{
|
|
template<typename Stream, typename V>
|
|
void Ser(Stream& s, const V& v)
|
|
{
|
|
Formatter formatter;
|
|
WriteCompactSize(s, v.size());
|
|
for (const typename V::value_type& elem : v) {
|
|
formatter.Ser(s, elem);
|
|
}
|
|
}
|
|
|
|
template<typename Stream, typename V>
|
|
void Unser(Stream& s, V& v)
|
|
{
|
|
Formatter formatter;
|
|
v.clear();
|
|
size_t size = ReadCompactSize(s);
|
|
size_t allocated = 0;
|
|
while (allocated < size) {
|
|
// For DoS prevention, do not blindly allocate as much as the stream claims to contain.
|
|
// Instead, allocate in 5MiB batches, so that an attacker actually needs to provide
|
|
// X MiB of data to make us allocate X+5 Mib.
|
|
static_assert(sizeof(typename V::value_type) <= MAX_VECTOR_ALLOCATE, "Vector element size too large");
|
|
allocated = std::min(size, allocated + MAX_VECTOR_ALLOCATE / sizeof(typename V::value_type));
|
|
v.reserve(allocated);
|
|
while (v.size() < allocated) {
|
|
v.emplace_back();
|
|
formatter.Unser(s, v.back());
|
|
}
|
|
}
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Forward declarations
|
|
*/
|
|
|
|
/**
|
|
* string
|
|
*/
|
|
template<typename Stream, typename C> void Serialize(Stream& os, const std::basic_string<C>& str);
|
|
template<typename Stream, typename C> void Unserialize(Stream& is, std::basic_string<C>& str);
|
|
|
|
/**
|
|
* prevector
|
|
* prevectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.
|
|
*/
|
|
template<typename Stream, unsigned int N, typename T> void Serialize_impl(Stream& os, const prevector<N, T>& v, const unsigned char&);
|
|
template<typename Stream, unsigned int N, typename T, typename V> void Serialize_impl(Stream& os, const prevector<N, T>& v, const V&);
|
|
template<typename Stream, unsigned int N, typename T> inline void Serialize(Stream& os, const prevector<N, T>& v);
|
|
template<typename Stream, unsigned int N, typename T> void Unserialize_impl(Stream& is, prevector<N, T>& v, const unsigned char&);
|
|
template<typename Stream, unsigned int N, typename T, typename V> void Unserialize_impl(Stream& is, prevector<N, T>& v, const V&);
|
|
template<typename Stream, unsigned int N, typename T> inline void Unserialize(Stream& is, prevector<N, T>& v);
|
|
|
|
/**
|
|
* vector
|
|
* vectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.
|
|
*/
|
|
template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, const unsigned char&);
|
|
template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, const bool&);
|
|
template<typename Stream, typename T, typename A, typename V> void Serialize_impl(Stream& os, const std::vector<T, A>& v, const V&);
|
|
template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v);
|
|
template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, const unsigned char&);
|
|
template<typename Stream, typename T, typename A, typename V> void Unserialize_impl(Stream& is, std::vector<T, A>& v, const V&);
|
|
template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v);
|
|
|
|
/**
|
|
* pair
|
|
*/
|
|
template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item);
|
|
template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item);
|
|
|
|
/**
|
|
* map
|
|
*/
|
|
template<typename Stream, typename K, typename T, typename Pred, typename A> void Serialize(Stream& os, const std::map<K, T, Pred, A>& m);
|
|
template<typename Stream, typename K, typename T, typename Pred, typename A> void Unserialize(Stream& is, std::map<K, T, Pred, A>& m);
|
|
|
|
/**
|
|
* set
|
|
*/
|
|
template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m);
|
|
template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m);
|
|
|
|
/**
|
|
* shared_ptr
|
|
*/
|
|
template<typename Stream, typename T> void Serialize(Stream& os, const std::shared_ptr<const T>& p);
|
|
template<typename Stream, typename T> void Unserialize(Stream& os, std::shared_ptr<const T>& p);
|
|
|
|
/**
|
|
* unique_ptr
|
|
*/
|
|
template<typename Stream, typename T> void Serialize(Stream& os, const std::unique_ptr<const T>& p);
|
|
template<typename Stream, typename T> void Unserialize(Stream& os, std::unique_ptr<const T>& p);
|
|
|
|
|
|
|
|
/**
|
|
* If none of the specialized versions above matched, default to calling member function.
|
|
*/
|
|
template<typename Stream, typename T>
|
|
inline void Serialize(Stream& os, const T& a)
|
|
{
|
|
a.Serialize(os);
|
|
}
|
|
|
|
template<typename Stream, typename T>
|
|
inline void Unserialize(Stream& is, T&& a)
|
|
{
|
|
a.Unserialize(is);
|
|
}
|
|
|
|
/** Default formatter. Serializes objects as themselves.
|
|
*
|
|
* The vector/prevector serialization code passes this to VectorFormatter
|
|
* to enable reusing that logic. It shouldn't be needed elsewhere.
|
|
*/
|
|
struct DefaultFormatter
|
|
{
|
|
template<typename Stream, typename T>
|
|
static void Ser(Stream& s, const T& t) { Serialize(s, t); }
|
|
|
|
template<typename Stream, typename T>
|
|
static void Unser(Stream& s, T& t) { Unserialize(s, t); }
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
* string
|
|
*/
|
|
template<typename Stream, typename C>
|
|
void Serialize(Stream& os, const std::basic_string<C>& str)
|
|
{
|
|
WriteCompactSize(os, str.size());
|
|
if (!str.empty())
|
|
os.write((char*)str.data(), str.size() * sizeof(C));
|
|
}
|
|
|
|
template<typename Stream, typename C>
|
|
void Unserialize(Stream& is, std::basic_string<C>& str)
|
|
{
|
|
unsigned int nSize = ReadCompactSize(is);
|
|
str.resize(nSize);
|
|
if (nSize != 0)
|
|
is.read((char*)str.data(), nSize * sizeof(C));
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* prevector
|
|
*/
|
|
template<typename Stream, unsigned int N, typename T>
|
|
void Serialize_impl(Stream& os, const prevector<N, T>& v, const unsigned char&)
|
|
{
|
|
WriteCompactSize(os, v.size());
|
|
if (!v.empty())
|
|
os.write((char*)v.data(), v.size() * sizeof(T));
|
|
}
|
|
|
|
template<typename Stream, unsigned int N, typename T, typename V>
|
|
void Serialize_impl(Stream& os, const prevector<N, T>& v, const V&)
|
|
{
|
|
Serialize(os, Using<VectorFormatter<DefaultFormatter>>(v));
|
|
}
|
|
|
|
template<typename Stream, unsigned int N, typename T>
|
|
inline void Serialize(Stream& os, const prevector<N, T>& v)
|
|
{
|
|
Serialize_impl(os, v, T());
|
|
}
|
|
|
|
|
|
template<typename Stream, unsigned int N, typename T>
|
|
void Unserialize_impl(Stream& is, prevector<N, T>& v, const unsigned char&)
|
|
{
|
|
// Limit size per read so bogus size value won't cause out of memory
|
|
v.clear();
|
|
unsigned int nSize = ReadCompactSize(is);
|
|
unsigned int i = 0;
|
|
while (i < nSize)
|
|
{
|
|
unsigned int blk = std::min(nSize - i, (unsigned int)(1 + 4999999 / sizeof(T)));
|
|
v.resize_uninitialized(i + blk);
|
|
is.read((char*)&v[i], blk * sizeof(T));
|
|
i += blk;
|
|
}
|
|
}
|
|
|
|
template<typename Stream, unsigned int N, typename T, typename V>
|
|
void Unserialize_impl(Stream& is, prevector<N, T>& v, const V&)
|
|
{
|
|
Unserialize(is, Using<VectorFormatter<DefaultFormatter>>(v));
|
|
}
|
|
|
|
template<typename Stream, unsigned int N, typename T>
|
|
inline void Unserialize(Stream& is, prevector<N, T>& v)
|
|
{
|
|
Unserialize_impl(is, v, T());
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* vector
|
|
*/
|
|
template<typename Stream, typename T, typename A>
|
|
void Serialize_impl(Stream& os, const std::vector<T, A>& v, const unsigned char&)
|
|
{
|
|
WriteCompactSize(os, v.size());
|
|
if (!v.empty())
|
|
os.write((char*)v.data(), v.size() * sizeof(T));
|
|
}
|
|
|
|
template<typename Stream, typename T, typename A>
|
|
void Serialize_impl(Stream& os, const std::vector<T, A>& v, const bool&)
|
|
{
|
|
// A special case for std::vector<bool>, as dereferencing
|
|
// std::vector<bool>::const_iterator does not result in a const bool&
|
|
// due to std::vector's special casing for bool arguments.
|
|
WriteCompactSize(os, v.size());
|
|
for (bool elem : v) {
|
|
::Serialize(os, elem);
|
|
}
|
|
}
|
|
|
|
template<typename Stream, typename T, typename A, typename V>
|
|
void Serialize_impl(Stream& os, const std::vector<T, A>& v, const V&)
|
|
{
|
|
Serialize(os, Using<VectorFormatter<DefaultFormatter>>(v));
|
|
}
|
|
|
|
template<typename Stream, typename T, typename A>
|
|
inline void Serialize(Stream& os, const std::vector<T, A>& v)
|
|
{
|
|
Serialize_impl(os, v, T());
|
|
}
|
|
|
|
|
|
template<typename Stream, typename T, typename A>
|
|
void Unserialize_impl(Stream& is, std::vector<T, A>& v, const unsigned char&)
|
|
{
|
|
// Limit size per read so bogus size value won't cause out of memory
|
|
v.clear();
|
|
unsigned int nSize = ReadCompactSize(is);
|
|
unsigned int i = 0;
|
|
while (i < nSize)
|
|
{
|
|
unsigned int blk = std::min(nSize - i, (unsigned int)(1 + 4999999 / sizeof(T)));
|
|
v.resize(i + blk);
|
|
is.read((char*)&v[i], blk * sizeof(T));
|
|
i += blk;
|
|
}
|
|
}
|
|
|
|
template<typename Stream, typename T, typename A, typename V>
|
|
void Unserialize_impl(Stream& is, std::vector<T, A>& v, const V&)
|
|
{
|
|
Unserialize(is, Using<VectorFormatter<DefaultFormatter>>(v));
|
|
}
|
|
|
|
template<typename Stream, typename T, typename A>
|
|
inline void Unserialize(Stream& is, std::vector<T, A>& v)
|
|
{
|
|
Unserialize_impl(is, v, T());
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* pair
|
|
*/
|
|
template<typename Stream, typename K, typename T>
|
|
void Serialize(Stream& os, const std::pair<K, T>& item)
|
|
{
|
|
Serialize(os, item.first);
|
|
Serialize(os, item.second);
|
|
}
|
|
|
|
template<typename Stream, typename K, typename T>
|
|
void Unserialize(Stream& is, std::pair<K, T>& item)
|
|
{
|
|
Unserialize(is, item.first);
|
|
Unserialize(is, item.second);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* map
|
|
*/
|
|
template<typename Stream, typename K, typename T, typename Pred, typename A>
|
|
void Serialize(Stream& os, const std::map<K, T, Pred, A>& m)
|
|
{
|
|
WriteCompactSize(os, m.size());
|
|
for (const auto& entry : m)
|
|
Serialize(os, entry);
|
|
}
|
|
|
|
template<typename Stream, typename K, typename T, typename Pred, typename A>
|
|
void Unserialize(Stream& is, std::map<K, T, Pred, A>& m)
|
|
{
|
|
m.clear();
|
|
unsigned int nSize = ReadCompactSize(is);
|
|
typename std::map<K, T, Pred, A>::iterator mi = m.begin();
|
|
for (unsigned int i = 0; i < nSize; i++)
|
|
{
|
|
std::pair<K, T> item;
|
|
Unserialize(is, item);
|
|
mi = m.insert(mi, item);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* set
|
|
*/
|
|
template<typename Stream, typename K, typename Pred, typename A>
|
|
void Serialize(Stream& os, const std::set<K, Pred, A>& m)
|
|
{
|
|
WriteCompactSize(os, m.size());
|
|
for (typename std::set<K, Pred, A>::const_iterator it = m.begin(); it != m.end(); ++it)
|
|
Serialize(os, (*it));
|
|
}
|
|
|
|
template<typename Stream, typename K, typename Pred, typename A>
|
|
void Unserialize(Stream& is, std::set<K, Pred, A>& m)
|
|
{
|
|
m.clear();
|
|
unsigned int nSize = ReadCompactSize(is);
|
|
typename std::set<K, Pred, A>::iterator it = m.begin();
|
|
for (unsigned int i = 0; i < nSize; i++)
|
|
{
|
|
K key;
|
|
Unserialize(is, key);
|
|
it = m.insert(it, key);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* unique_ptr
|
|
*/
|
|
template<typename Stream, typename T> void
|
|
Serialize(Stream& os, const std::unique_ptr<const T>& p)
|
|
{
|
|
Serialize(os, *p);
|
|
}
|
|
|
|
template<typename Stream, typename T>
|
|
void Unserialize(Stream& is, std::unique_ptr<const T>& p)
|
|
{
|
|
p.reset(new T(deserialize, is));
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* shared_ptr
|
|
*/
|
|
template<typename Stream, typename T> void
|
|
Serialize(Stream& os, const std::shared_ptr<const T>& p)
|
|
{
|
|
Serialize(os, *p);
|
|
}
|
|
|
|
template<typename Stream, typename T>
|
|
void Unserialize(Stream& is, std::shared_ptr<const T>& p)
|
|
{
|
|
p = std::make_shared<const T>(deserialize, is);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Support for ADD_SERIALIZE_METHODS and READWRITE macro
|
|
*/
|
|
struct CSerActionSerialize
|
|
{
|
|
constexpr bool ForRead() const { return false; }
|
|
};
|
|
struct CSerActionUnserialize
|
|
{
|
|
constexpr bool ForRead() const { return true; }
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* ::GetSerializeSize implementations
|
|
*
|
|
* Computing the serialized size of objects is done through a special stream
|
|
* object of type CSizeComputer, which only records the number of bytes written
|
|
* to it.
|
|
*
|
|
* If your Serialize or SerializationOp method has non-trivial overhead for
|
|
* serialization, it may be worthwhile to implement a specialized version for
|
|
* CSizeComputer, which uses the s.seek() method to record bytes that would
|
|
* be written instead.
|
|
*/
|
|
class CSizeComputer
|
|
{
|
|
protected:
|
|
size_t nSize;
|
|
|
|
const int nVersion;
|
|
public:
|
|
explicit CSizeComputer(int nVersionIn) : nSize(0), nVersion(nVersionIn) {}
|
|
|
|
void write(const char *psz, size_t _nSize)
|
|
{
|
|
this->nSize += _nSize;
|
|
}
|
|
|
|
/** Pretend _nSize bytes are written, without specifying them. */
|
|
void seek(size_t _nSize)
|
|
{
|
|
this->nSize += _nSize;
|
|
}
|
|
|
|
template<typename T>
|
|
CSizeComputer& operator<<(const T& obj)
|
|
{
|
|
::Serialize(*this, obj);
|
|
return (*this);
|
|
}
|
|
|
|
size_t size() const {
|
|
return nSize;
|
|
}
|
|
|
|
int GetVersion() const { return nVersion; }
|
|
};
|
|
|
|
template<typename Stream>
|
|
void SerializeMany(Stream& s)
|
|
{
|
|
}
|
|
|
|
template<typename Stream, typename Arg, typename... Args>
|
|
void SerializeMany(Stream& s, const Arg& arg, const Args&... args)
|
|
{
|
|
::Serialize(s, arg);
|
|
::SerializeMany(s, args...);
|
|
}
|
|
|
|
template<typename Stream>
|
|
inline void UnserializeMany(Stream& s)
|
|
{
|
|
}
|
|
|
|
template<typename Stream, typename Arg, typename... Args>
|
|
inline void UnserializeMany(Stream& s, Arg&& arg, Args&&... args)
|
|
{
|
|
::Unserialize(s, arg);
|
|
::UnserializeMany(s, args...);
|
|
}
|
|
|
|
template<typename Stream, typename... Args>
|
|
inline void SerReadWriteMany(Stream& s, CSerActionSerialize ser_action, const Args&... args)
|
|
{
|
|
::SerializeMany(s, args...);
|
|
}
|
|
|
|
template<typename Stream, typename... Args>
|
|
inline void SerReadWriteMany(Stream& s, CSerActionUnserialize ser_action, Args&&... args)
|
|
{
|
|
::UnserializeMany(s, args...);
|
|
}
|
|
|
|
template<typename I>
|
|
inline void WriteVarInt(CSizeComputer &s, I n)
|
|
{
|
|
s.seek(GetSizeOfVarInt<I>(n));
|
|
}
|
|
|
|
inline void WriteCompactSize(CSizeComputer &s, uint64_t nSize)
|
|
{
|
|
s.seek(GetSizeOfCompactSize(nSize));
|
|
}
|
|
|
|
template <typename T>
|
|
size_t GetSerializeSize(const T& t, int nVersion = 0)
|
|
{
|
|
return (CSizeComputer(nVersion) << t).size();
|
|
}
|
|
|
|
template <typename... T>
|
|
size_t GetSerializeSizeMany(int nVersion, const T&... t)
|
|
{
|
|
CSizeComputer sc(nVersion);
|
|
SerializeMany(sc, t...);
|
|
return sc.size();
|
|
}
|
|
|
|
#endif // BITCOIN_SERIALIZE_H
|