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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_UNDO_H
#define BITCOIN_UNDO_H
#include <coins.h>
#include <compressor.h>
#include <consensus/consensus.h>
#include <primitives/transaction.h>
#include <serialize.h>
#include <version.h>
/** Formatter for undo information for a CTxIn
*
* Contains the prevout's CTxOut being spent, and its metadata as well
* (coinbase or not, height). The serialization contains a dummy value of
* zero. This is compatible with older versions which expect to see
* the transaction version there.
*/
struct TxInUndoFormatter
{
template<typename Stream>
void Ser(Stream &s, const Coin& txout) {
::Serialize(s, VARINT(txout.nHeight * 2 + (txout.fCoinBase ? 1u : 0u)));
if (txout.nHeight > 0) {
// Required to maintain compatibility with older undo format.
::Serialize(s, (unsigned char)0);
}
::Serialize(s, Using<TxOutCompression>(txout.out));
}
template<typename Stream>
void Unser(Stream &s, Coin& txout) {
unsigned int nCode = 0;
::Unserialize(s, VARINT(nCode));
txout.nHeight = nCode / 2;
txout.fCoinBase = nCode & 1;
if (txout.nHeight > 0) {
// Old versions stored the version number for the last spend of
// a transaction's outputs. Non-final spends were indicated with
// height = 0.
unsigned int nVersionDummy;
::Unserialize(s, VARINT(nVersionDummy));
}
::Unserialize(s, Using<TxOutCompression>(txout.out));
}
};
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
std::vector<Coin> vprevout;
SERIALIZE_METHODS(CTxUndo, obj) { READWRITE(Using<VectorFormatter<TxInUndoFormatter>>(obj.vprevout)); }
};
/** Undo information for a CBlock */
class CBlockUndo
{
public:
std::vector<CTxUndo> vtxundo; // for all but the coinbase
SERIALIZE_METHODS(CBlockUndo, obj) { READWRITE(obj.vtxundo); }
};
#endif // BITCOIN_UNDO_H
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