[MOVEONLY] Move old CCoins class to txdb.cpp

It's only used for upgrading from the old database anymore.

src/coins.h

@@ -82,57 +82,6 @@ public:
     }
 };
 
-//! Legacy class to deserialize pre-pertxout database entries without reindex.
-class CCoins
-{
-public:
-    //! whether transaction is a coinbase
-    bool fCoinBase;
-
-    //! unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped
-    std::vector<CTxOut> vout;
-
-    //! at which height this transaction was included in the active block chain
-    int nHeight;
-
-    //! empty constructor
-    CCoins() : fCoinBase(false), vout(0), nHeight(0) { }
-
-    template<typename Stream>
-    void Unserialize(Stream &s) {
-        unsigned int nCode = 0;
-        // version
-        int nVersionDummy;
-        ::Unserialize(s, VARINT(nVersionDummy));
-        // header code
-        ::Unserialize(s, VARINT(nCode));
-        fCoinBase = nCode & 1;
-        std::vector<bool> vAvail(2, false);
-        vAvail[0] = (nCode & 2) != 0;
-        vAvail[1] = (nCode & 4) != 0;
-        unsigned int nMaskCode = (nCode / 8) + ((nCode & 6) != 0 ? 0 : 1);
-        // spentness bitmask
-        while (nMaskCode > 0) {
-            unsigned char chAvail = 0;
-            ::Unserialize(s, chAvail);
-            for (unsigned int p = 0; p < 8; p++) {
-                bool f = (chAvail & (1 << p)) != 0;
-                vAvail.push_back(f);
-            }
-            if (chAvail != 0)
-                nMaskCode--;
-        }
-        // txouts themself
-        vout.assign(vAvail.size(), CTxOut());
-        for (unsigned int i = 0; i < vAvail.size(); i++) {
-            if (vAvail[i])
-                ::Unserialize(s, REF(CTxOutCompressor(vout[i])));
-        }
-        // coinbase height
-        ::Unserialize(s, VARINT(nHeight));
-    }
-};
-
 class SaltedOutpointHasher
 {
 private:

src/txdb.cpp

@@ -253,6 +253,61 @@ bool CBlockTreeDB::LoadBlockIndexGuts(std::function<CBlockIndex*(const uint256&)
     return true;
 }
 
+namespace {
+
+//! Legacy class to deserialize pre-pertxout database entries without reindex.
+class CCoins
+{
+public:
+    //! whether transaction is a coinbase
+    bool fCoinBase;
+
+    //! unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped
+    std::vector<CTxOut> vout;
+
+    //! at which height this transaction was included in the active block chain
+    int nHeight;
+
+    //! empty constructor
+    CCoins() : fCoinBase(false), vout(0), nHeight(0) { }
+
+    template<typename Stream>
+    void Unserialize(Stream &s) {
+        unsigned int nCode = 0;
+        // version
+        int nVersionDummy;
+        ::Unserialize(s, VARINT(nVersionDummy));
+        // header code
+        ::Unserialize(s, VARINT(nCode));
+        fCoinBase = nCode & 1;
+        std::vector<bool> vAvail(2, false);
+        vAvail[0] = (nCode & 2) != 0;
+        vAvail[1] = (nCode & 4) != 0;
+        unsigned int nMaskCode = (nCode / 8) + ((nCode & 6) != 0 ? 0 : 1);
+        // spentness bitmask
+        while (nMaskCode > 0) {
+            unsigned char chAvail = 0;
+            ::Unserialize(s, chAvail);
+            for (unsigned int p = 0; p < 8; p++) {
+                bool f = (chAvail & (1 << p)) != 0;
+                vAvail.push_back(f);
+            }
+            if (chAvail != 0)
+                nMaskCode--;
+        }
+        // txouts themself
+        vout.assign(vAvail.size(), CTxOut());
+        for (unsigned int i = 0; i < vAvail.size(); i++) {
+            if (vAvail[i])
+                ::Unserialize(s, REF(CTxOutCompressor(vout[i])));
+        }
+        // coinbase height
+        ::Unserialize(s, VARINT(nHeight));
+    }
+};
+
+}
+
 /** Upgrade the database from older formats.
  *
  * Currently implemented: from the per-tx utxo model (0.8..0.14.x) to per-txout.