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-rw-r--r--src/undo.h84
1 files changed, 58 insertions, 26 deletions
diff --git a/src/undo.h b/src/undo.h
index a94e31f5cc..3749d5d7a8 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -7,58 +7,90 @@
#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 if this was the
- * last output of the affected transaction, its metadata as well
- * (coinbase or not, height, transaction version)
+ * 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 be compatible with older versions which expect to see
+ * the transaction version there.
*/
-class CTxInUndo
+class TxInUndoSerializer
{
-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) { }
+ const Coin* txout;
+public:
template<typename Stream>
void Serialize(Stream &s) const {
- ::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)));
- if (nHeight > 0)
- ::Serialize(s, VARINT(this->nVersion));
- ::Serialize(s, CTxOutCompressor(REF(txout)));
+ ::Serialize(s, VARINT(txout->nHeight * 2 + (txout->fCoinBase ? 1 : 0)));
+ if (txout->nHeight > 0) {
+ // Required to maintain compatibility with older undo format.
+ ::Serialize(s, (unsigned char)0);
+ }
+ ::Serialize(s, CTxOutCompressor(REF(txout->out)));
}
+ 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));
- nHeight = nCode / 2;
- fCoinBase = nCode & 1;
- if (nHeight > 0)
- ::Unserialize(s, VARINT(this->nVersion));
- ::Unserialize(s, REF(CTxOutCompressor(REF(txout))));
+ 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.
+ int nVersionDummy;
+ ::Unserialize(s, VARINT(nVersionDummy));
+ }
+ ::Unserialize(s, REF(CTxOutCompressor(REF(txout->out))));
}
+
+ TxInUndoDeserializer(Coin* coin) : txout(coin) {}
};
+static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_BASE_SIZE / ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION);
+
/** Undo information for a CTransaction */
class CTxUndo
{
public:
// undo information for all txins
- std::vector<CTxInUndo> vprevout;
+ std::vector<Coin> vprevout;
- ADD_SERIALIZE_METHODS;
+ 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, REF(TxInUndoSerializer(&prevout)));
+ }
+ }
- template <typename Stream, typename Operation>
- inline void SerializationOp(Stream& s, Operation ser_action) {
- READWRITE(vprevout);
+ 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, REF(TxInUndoDeserializer(&prevout)));
+ }
}
};