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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 <compressor.h>
#include <consensus/consensus.h>
#include <primitives/transaction.h>
#include <serialize.h>
/** 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.
*/
class TxInUndoSerializer
{
const Coin* txout;
public:
template<typename Stream>
void Serialize(Stream &s) const {
::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, CTxOutCompressor(REF(txout->out)));
}
explicit TxInUndoSerializer(const Coin* coin) : txout(coin) {}
};
class TxInUndoDeserializer
{
Coin* txout;
public:
template<typename Stream>
void Unserialize(Stream &s) {
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, CTxOutCompressor(REF(txout->out)));
}
explicit TxInUndoDeserializer(Coin* coin) : txout(coin) {}
};
static const size_t MIN_TRANSACTION_INPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION);
static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_WEIGHT / MIN_TRANSACTION_INPUT_WEIGHT;
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
std::vector<Coin> vprevout;
template <typename Stream>
void Serialize(Stream& s) const {
// TODO: avoid reimplementing vector serializer
uint64_t count = vprevout.size();
::Serialize(s, COMPACTSIZE(REF(count)));
for (const auto& prevout : vprevout) {
::Serialize(s, TxInUndoSerializer(&prevout));
}
}
template <typename Stream>
void Unserialize(Stream& s) {
// TODO: avoid reimplementing vector deserializer
uint64_t count = 0;
::Unserialize(s, COMPACTSIZE(count));
if (count > MAX_INPUTS_PER_BLOCK) {
throw std::ios_base::failure("Too many input undo records");
}
vprevout.resize(count);
for (auto& prevout : vprevout) {
::Unserialize(s, TxInUndoDeserializer(&prevout));
}
}
};
/** 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) {
READWRITE(vtxundo);
}
};
#endif // BITCOIN_UNDO_H
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