src/undo.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #ifndef BITCOIN_UNDO_H
   7 #define BITCOIN_UNDO_H
   8
   9 #include "compressor.h"
  10 #include "primitives/transaction.h"
  11 #include "serialize.h"
  12
  13 /** Undo information for a CTxIn
  14  *
  15  *  Contains the prevout's CTxOut being spent, and if this was the
  16  *  last output of the affected transaction, its metadata as well
  17  *  (coinbase or not, height, transaction version)
  18  */
  19 class CTxInUndo
  20 {
  21 public:
  22     CTxOut txout;         // the txout data before being spent
  23     bool fCoinBase;       // if the outpoint was the last unspent: whether it belonged to a coinbase
  24     unsigned int nHeight; // if the outpoint was the last unspent: its height
  25     int nVersion;         // if the outpoint was the last unspent: its version
  26
  27     CTxInUndo() : txout(), fCoinBase(false), nHeight(0), nVersion(0) {}
  28     CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { }
  29
  30     template<typename Stream>
  31     void Serialize(Stream &s) const {
  32         ::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)));
  33         if (nHeight > 0)
  34             ::Serialize(s, VARINT(this->nVersion));
  35         ::Serialize(s, CTxOutCompressor(REF(txout)));
  36     }
  37
  38     template<typename Stream>
  39     void Unserialize(Stream &s) {
  40         unsigned int nCode = 0;
  41         ::Unserialize(s, VARINT(nCode));
  42         nHeight = nCode / 2;
  43         fCoinBase = nCode & 1;
  44         if (nHeight > 0)
  45             ::Unserialize(s, VARINT(this->nVersion));
  46         ::Unserialize(s, REF(CTxOutCompressor(REF(txout))));
  47     }
  48 };
  49
  50 /** Undo information for a CTransaction */
  51 class CTxUndo
  52 {
  53 public:
  54     // undo information for all txins
  55     std::vector<CTxInUndo> vprevout;
  56
  57     ADD_SERIALIZE_METHODS;
  58
  59     template <typename Stream, typename Operation>
  60     inline void SerializationOp(Stream& s, Operation ser_action) {
  61         READWRITE(vprevout);
  62     }
  63 };
  64
  65 /** Undo information for a CBlock */
  66 class CBlockUndo
  67 {
  68 public:
  69     std::vector<CTxUndo> vtxundo; // for all but the coinbase
  70
  71     ADD_SERIALIZE_METHODS;
  72
  73     template <typename Stream, typename Operation>
  74     inline void SerializationOp(Stream& s, Operation ser_action) {
  75         READWRITE(vtxundo);
  76     }
  77 };
  78
  79 #endif // BITCOIN_UNDO_H