116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 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 <coins.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 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 ? 1u : 0u)));
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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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unsigned int nVersionDummy;
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::Unserialize(s, VARINT(nVersionDummy));
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}
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::Unserialize(s, 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(), 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, 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, 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 coinbas
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uint256 old_tree_root;
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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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READWRITE(old_tree_root);
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}
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};
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#endif // BITCOIN_UNDO_H
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