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98 lines
2.8 KiB
98 lines
2.8 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2020 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 <mw/models/block/BlockUndo.h>
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#include <primitives/transaction.h>
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#include <serialize.h>
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#include <version.h>
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/** Formatter for 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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struct TxInUndoFormatter
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{
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template<typename Stream>
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void Ser(Stream &s, const Coin& txout) {
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::Serialize(s, VARINT(txout.nHeight * uint32_t{2} + txout.fCoinBase ));
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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, Using<TxOutCompression>(txout.out));
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}
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template<typename Stream>
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void Unser(Stream &s, Coin& txout) {
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uint32_t nCode = 0;
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::Unserialize(s, VARINT(nCode));
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txout.nHeight = nCode >> 1;
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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 = 0;
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::Unserialize(s, VARINT(nVersionDummy));
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}
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::Unserialize(s, Using<TxOutCompression>(txout.out));
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}
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};
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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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SERIALIZE_METHODS(CTxUndo, obj) { READWRITE(Using<VectorFormatter<TxInUndoFormatter>>(obj.vprevout)); }
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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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mw::BlockUndo::CPtr mwundo;
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SERIALIZE_METHODS(CBlockUndo, obj)
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{
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READWRITE(obj.vtxundo);
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if (obj.mwundo != nullptr) {
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READWRITE(obj.mwundo);
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}
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}
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};
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template <typename Stream>
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inline void UnserializeBlockUndo(CBlockUndo& blockundo, Stream& s, const unsigned int num_bytes)
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{
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const uint64_t num_txs = ::ReadCompactSize(s);
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blockundo.vtxundo.reserve(num_txs);
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for (uint64_t i = 0; i < num_txs; i++) {
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CTxUndo txundo;
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s >> txundo;
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blockundo.vtxundo.emplace_back(std::move(txundo));
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}
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if (::GetSerializeSize(blockundo) < num_bytes) {
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// There's more data to read. MWEB rewind data must be available.
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s >> blockundo.mwundo;
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}
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}
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#endif // BITCOIN_UNDO_H
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