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112 lines
3.4 KiB
112 lines
3.4 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Copyright (c) 2009-2017 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_UNDO_H |
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#define BITCOIN_UNDO_H |
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#include <compressor.h> |
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#include <consensus/consensus.h> |
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#include <primitives/transaction.h> |
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#include <serialize.h> |
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/** Undo information for a CTxIn |
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* |
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* Contains the prevout's CTxOut being spent, and its metadata as well |
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* (coinbase or not, height). The serialization contains a dummy value of |
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* zero. This is be compatible with older versions which expect to see |
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* the transaction version there. |
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*/ |
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class TxInUndoSerializer |
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{ |
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const Coin* txout; |
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public: |
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template<typename Stream> |
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void Serialize(Stream &s) const { |
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::Serialize(s, VARINT(txout->nHeight * 2 + (txout->fCoinBase ? 1 : 0))); |
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if (txout->nHeight > 0) { |
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// Required to maintain compatibility with older undo format. |
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::Serialize(s, (unsigned char)0); |
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} |
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::Serialize(s, CTxOutCompressor(REF(txout->out))); |
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} |
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explicit TxInUndoSerializer(const Coin* coin) : txout(coin) {} |
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}; |
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class TxInUndoDeserializer |
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{ |
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Coin* txout; |
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public: |
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template<typename Stream> |
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void Unserialize(Stream &s) { |
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unsigned int nCode = 0; |
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::Unserialize(s, VARINT(nCode)); |
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txout->nHeight = nCode / 2; |
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txout->fCoinBase = nCode & 1; |
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if (txout->nHeight > 0) { |
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// Old versions stored the version number for the last spend of |
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// a transaction's outputs. Non-final spends were indicated with |
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// height = 0. |
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int nVersionDummy; |
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::Unserialize(s, VARINT(nVersionDummy)); |
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} |
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::Unserialize(s, REF(CTxOutCompressor(REF(txout->out)))); |
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} |
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explicit TxInUndoDeserializer(Coin* coin) : txout(coin) {} |
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}; |
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static const size_t MIN_TRANSACTION_INPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION); |
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static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_WEIGHT / MIN_TRANSACTION_INPUT_WEIGHT; |
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/** Undo information for a CTransaction */ |
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class CTxUndo |
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{ |
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public: |
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// undo information for all txins |
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std::vector<Coin> vprevout; |
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template <typename Stream> |
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void Serialize(Stream& s) const { |
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// TODO: avoid reimplementing vector serializer |
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uint64_t count = vprevout.size(); |
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::Serialize(s, COMPACTSIZE(REF(count))); |
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for (const auto& prevout : vprevout) { |
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::Serialize(s, REF(TxInUndoSerializer(&prevout))); |
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} |
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} |
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template <typename Stream> |
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void Unserialize(Stream& s) { |
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// TODO: avoid reimplementing vector deserializer |
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uint64_t count = 0; |
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::Unserialize(s, COMPACTSIZE(count)); |
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if (count > MAX_INPUTS_PER_BLOCK) { |
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throw std::ios_base::failure("Too many input undo records"); |
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} |
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vprevout.resize(count); |
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for (auto& prevout : vprevout) { |
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::Unserialize(s, REF(TxInUndoDeserializer(&prevout))); |
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} |
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} |
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}; |
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/** Undo information for a CBlock */ |
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class CBlockUndo |
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{ |
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public: |
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std::vector<CTxUndo> vtxundo; // for all but the coinbase |
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ADD_SERIALIZE_METHODS; |
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template <typename Stream, typename Operation> |
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inline void SerializationOp(Stream& s, Operation ser_action) { |
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READWRITE(vtxundo); |
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} |
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}; |
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#endif // BITCOIN_UNDO_H
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