Relay OP_RETURN data TxOut as standard transaction type

[novacoin.git] / src / script.cpp

diff --git a/src/script.cpp b/src/script.cpp
index 34c02cf..15733a7 100644 (file)
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -102,6 +102,7 @@ const char* GetTxnOutputType(txnouttype t)
     case TX_PUBKEYHASH: return "pubkeyhash";
     case TX_SCRIPTHASH: return "scripthash";
     case TX_MULTISIG: return "multisig";
+    case TX_NULL_DATA: return "nulldata";
     }
     return NULL;
 }
@@ -1232,6 +1233,9 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
 
         // Sender provides N pubkeys, receivers provides M signatures
         mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG));
+
+        // Empty, provably prunable, data-carrying output
+        mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
     }
 
     // Shortcut for pay-to-script-hash, which are more constrained than the other types:
@@ -1316,6 +1320,12 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
                 else
                     break;
             }
+            else if (opcode2 == OP_SMALLDATA)
+            {
+                // small pushdata, <= 80 bytes
+                if (vch1.size() > 80)
+                    break;
+            }
             else if (opcode1 != opcode2 || vch1 != vch2)
             {
                 // Others must match exactly
@@ -1378,6 +1388,7 @@ bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash
     switch (whichTypeRet)
     {
     case TX_NONSTANDARD:
+    case TX_NULL_DATA:
         return false;
     case TX_PUBKEY:
         keyID = CPubKey(vSolutions[0]).GetID();
@@ -1409,6 +1420,8 @@ int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned c
     {
     case TX_NONSTANDARD:
         return -1;
+    case TX_NULL_DATA:
+        return 1;
     case TX_PUBKEY:
         return 1;
     case TX_PUBKEYHASH:
@@ -1423,10 +1436,9 @@ int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned c
     return -1;
 }
 
-bool IsStandard(const CScript& scriptPubKey)
+bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
 {
     vector<valtype> vSolutions;
-    txnouttype whichType;
     if (!Solver(scriptPubKey, whichType, vSolutions))
         return false;
 
@@ -1485,6 +1497,7 @@ bool IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
     switch (whichType)
     {
     case TX_NONSTANDARD:
+    case TX_NULL_DATA:
         return false;
     case TX_PUBKEY:
         keyID = CPubKey(vSolutions[0]).GetID();
@@ -1583,6 +1596,8 @@ bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vecto
     vector<valtype> vSolutions;
     if (!Solver(scriptPubKey, typeRet, vSolutions))
         return false;
+    if (typeRet == TX_NULL_DATA)
+        return true;
 
     if (typeRet == TX_MULTISIG)
     {
@@ -1772,6 +1787,7 @@ static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo,
     switch (txType)
     {
     case TX_NONSTANDARD:
+    case TX_NULL_DATA:
         // Don't know anything about this, assume bigger one is correct:
         if (sigs1.size() >= sigs2.size())
             return PushAll(sigs1);
@@ -1881,6 +1897,33 @@ bool CScript::IsPayToScriptHash() const
             this->at(22) == OP_EQUAL);
 }
 
+bool CScript::HasCanonicalPushes() const
+{
+    const_iterator pc = begin();
+    while (pc < end())
+    {
+        opcodetype opcode;
+        std::vector<unsigned char> data;
+        if (!GetOp(pc, opcode, data))
+            return false;
+        if (opcode > OP_16)
+            continue;
+        if (opcode < OP_PUSHDATA1 && opcode > OP_0 && (data.size() == 1 && data[0] <= 16))
+            // Could have used an OP_n code, rather than a 1-byte push.
+            return false;
+        if (opcode == OP_PUSHDATA1 && data.size() < OP_PUSHDATA1)
+            // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
+            return false;
+        if (opcode == OP_PUSHDATA2 && data.size() <= 0xFF)
+            // Could have used an OP_PUSHDATA1.
+            return false;
+        if (opcode == OP_PUSHDATA4 && data.size() <= 0xFFFF)
+            // Could have used an OP_PUSHDATA2.
+            return false;
+    }
+    return true;
+}
+
 class CScriptVisitor : public boost::static_visitor<bool>
 {
 private: