From 3c94b0039d2ca2a8c41fd6127ff5019a2afc304e Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Wed, 29 Jan 2020 11:21:36 -0800
Subject: Convert undo.h to new serialization framework

---
 src/undo.h | 69 ++++++++++++--------------------------------------------------
 1 file changed, 13 insertions(+), 56 deletions(-)

(limited to 'src')

diff --git a/src/undo.h b/src/undo.h
index 2009c721ab..47f132c7d8 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -13,58 +13,42 @@
 #include <serialize.h>
 #include <version.h>
 
-/** Undo information for a CTxIn
+/** 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.
  */
-class TxInUndoSerializer
+struct TxInUndoFormatter
 {
-    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) {
+    void Ser(Stream &s, const Coin& txout) {
+        ::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, Using<TxOutCompression>(REF(txout->out)));
+        ::Serialize(s, Using<TxOutCompression>(txout.out));
     }
 
-    explicit TxInUndoSerializer(const Coin* coin) : txout(coin) {}
-};
-
-class TxInUndoDeserializer
-{
-    Coin* txout;
-
-public:
     template<typename Stream>
-    void Unserialize(Stream &s) {
+    void Unser(Stream &s, Coin& txout) {
         unsigned int nCode = 0;
         ::Unserialize(s, VARINT(nCode));
-        txout->nHeight = nCode / 2;
-        txout->fCoinBase = nCode & 1;
-        if (txout->nHeight > 0) {
+        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, Using<TxOutCompression>(REF(txout->out)));
+        ::Unserialize(s, Using<TxOutCompression>(txout.out));
     }
-
-    explicit TxInUndoDeserializer(Coin* coin) : txout(coin) {}
 };
 
-static const size_t MIN_TRANSACTION_INPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxIn(), PROTOCOL_VERSION);
-static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_WEIGHT / MIN_TRANSACTION_INPUT_WEIGHT;
-
 /** Undo information for a CTransaction */
 class CTxUndo
 {
@@ -72,29 +56,7 @@ 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));
-        }
-    }
+    SERIALIZE_METHODS(CTxUndo, obj) { READWRITE(Using<VectorFormatter<TxInUndoFormatter>>(obj.vprevout)); }
 };
 
 /** Undo information for a CBlock */
@@ -103,12 +65,7 @@ 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);
-    }
+    SERIALIZE_METHODS(CBlockUndo, obj) { READWRITE(obj.vtxundo); }
 };
 
 #endif // BITCOIN_UNDO_H
-- 
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