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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 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 "compressor.h"
#include "primitives/transaction.h"
#include "serialize.h"
/** Undo information for a CTxIn
*
* Contains the prevout's CTxOut being spent, and if this was the
* last output of the affected transaction, its metadata as well
* (coinbase or not, height, transaction version)
*/
class CTxInUndo
{
public:
CTxOut txout; // the txout data before being spent
bool fCoinBase; // if the outpoint was the last unspent: whether it belonged to a coinbase
unsigned int nHeight; // if the outpoint was the last unspent: its height
int nVersion; // if the outpoint was the last unspent: its version
CTxInUndo() : txout(), fCoinBase(false), nHeight(0), nVersion(0) {}
CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { }
template<typename Stream>
void Serialize(Stream &s, int nType, int nVersion) const {
::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)), nType, nVersion);
if (nHeight > 0)
::Serialize(s, VARINT(this->nVersion), nType, nVersion);
::Serialize(s, CTxOutCompressor(REF(txout)), nType, nVersion);
}
template<typename Stream>
void Unserialize(Stream &s, int nType, int nVersion) {
unsigned int nCode = 0;
::Unserialize(s, VARINT(nCode), nType, nVersion);
nHeight = nCode / 2;
fCoinBase = nCode & 1;
if (nHeight > 0)
::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
::Unserialize(s, REF(CTxOutCompressor(REF(txout))), nType, nVersion);
}
};
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
std::vector<CTxInUndo> vprevout;
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(vprevout);
}
};
/** Undo information for a CBlock */
class CBlockUndo
{
public:
std::vector<CTxUndo> vtxundo; // for all but the coinbase
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(vtxundo);
}
};
#endif // BITCOIN_UNDO_H
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