Initial Vexta Core v0.1.0 release

src/undo.h

@@ -0,0 +1,72 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2020 The Bitcoin Core developers
+// Copyright (c) 2014-2020 The DigiByte Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef DIGIBYTE_UNDO_H
+#define DIGIBYTE_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 * uint32_t{2} + txout.fCoinBase ));
+        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) {
+        uint32_t nCode = 0;
+        ::Unserialize(s, VARINT(nCode));
+        txout.nHeight = nCode >> 1;
+        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 // DIGIBYTE_UNDO_H