Rewrite time locks, coinbase validation, and script functions in C++ for easier integration

src/script/script_ext.h

@@ -0,0 +1,50 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 The Bitcoin Core developers
+// Copyright (c) 2018 The Verus developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_SCRIPT_SCRIPT_EXT_H
+#define BITCOIN_SCRIPT_SCRIPT_EXT_H
+
+#include "script.h"
+#include "standard.h"
+#include "pubkey.h"
+
+#define OPRETTYPE_TIMELOCK 1
+
+class CScriptExt : public CScript
+{
+    public:
+        CScriptExt() { }
+        CScriptExt(const CScript& b) : CScript(b.begin(), b.end()) { }
+        CScriptExt(const_iterator pbegin, const_iterator pend) : CScript(pbegin, pend) { }
+        CScriptExt(const unsigned char* pbegin, const unsigned char* pend) : CScript(pbegin, pend) { }
+
+        // overload to return the hash of the referenced script
+        bool IsPayToScriptHash(CScriptID *scriptID) const;
+
+        // P2PKH script, adds to whatever is already in the script (for example CLTV)
+        const CScriptExt &AddPayToPubKeyHash(const CKeyID &key) const;
+
+        // push data into an op_return script with an opret type indicator, fails if the op_return is too large
+        const CScriptExt &OpReturnScript(const std::vector<unsigned char> &data, unsigned char opretType) const;
+
+        // P2SH script
+        const CScriptExt &PayToScriptHash(const CScriptID &scriptID) const;
+
+        // P2SH script, adds to whatever is already in the script (for example CLTV)
+        const CScriptExt &AddCheckLockTimeVerify(int64_t unlocktime) const;
+
+        // combined CLTV script and P2PKH
+        const CScriptExt &TimeLockSpend(const CKeyID &key, int64_t unlocktime) const;
+
+        // if the front of the script has check lock time verify. this is a fairly simple check.
+        // accepts NULL as parameter if unlockTime is not needed.
+        bool IsCheckLockTimeVerify(int64_t *unlockTime) const;
+
+        bool IsCheckLockTimeVerify() const;
+};
+
+#endif
+