From c3ab6a374a69d06b5fd0f5c343ddbb3bb57394db Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Wed, 3 Jun 2015 12:47:29 -0700
Subject: [PATCH] Add regtest mode with a very large OP_TRUE output

---
 src/chainparams.cpp     | 11 +++++++++++
 src/init.cpp            |  6 +++++-
 src/script/sign.cpp     |  3 +++
 src/script/standard.cpp | 29 +++++++++++++++++++++--------
 src/script/standard.h   |  1 +
 src/wallet_ismine.cpp   |  2 ++
 6 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index bb5d5519c2..a5b4b488c4 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -247,6 +247,17 @@ public:
         genesis.proof = CProof(0x207fffff, 2);
         nDefaultPort = 18444;
 
+        CMutableTransaction txNew(genesis.vtx[0]);
+        txNew.vout.resize(2);
+        txNew.vout[0].nValue = MAX_MONEY / 2;
+        txNew.vout[1].nValue = MAX_MONEY / 2;
+        txNew.vout[1].scriptPubKey = CScript() << OP_TRUE;
+        genesis.vtx[0] = CTransaction(txNew);
+
+        CScript scriptDestination(CScript() << OP_TRUE);
+        genesis.proof = CProof(scriptDestination, CScript()); // genesis block gets a PoW pass
+        genesis.hashMerkleRoot = genesis.BuildMerkleTree();
+
         hashGenesisBlock = genesis.GetHash();
         mapCheckpointsRegtest[0] = hashGenesisBlock;
 
diff --git a/src/init.cpp b/src/init.cpp
index a80ba01cd9..8025ddcf6c 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1191,7 +1191,6 @@ bool AppInit2(boost::thread_group& threadGroup)
                 strErrors << _("Cannot downgrade wallet") << "\n";
             pwalletMain->SetMaxVersion(nMaxVersion);
         }
-
         if (fFirstRun)
         {
             // Create new keyUser and set as default key
@@ -1212,6 +1211,11 @@ bool AppInit2(boost::thread_group& threadGroup)
 
         RegisterValidationInterface(pwalletMain);
 
+        CBlock block = Params().GenesisBlock();
+        BOOST_FOREACH(const CTransaction &tx, block.vtx) {
+            SyncWithWallets(tx, &block);
+        }
+
         CBlockIndex *pindexRescan = chainActive.Tip();
         if (GetBoolArg("-rescan", false))
             pindexRescan = chainActive.Genesis();
diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index 515818ed44..7375f9ac26 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -105,6 +105,8 @@ static bool SignStep(const BaseSignatureCreator& creator, const CScript& scriptP
     case TX_MULTISIG:
         scriptSigRet << OP_0; // workaround CHECKMULTISIG bug
         return (SignN(vSolutions, creator, scriptPubKey, scriptSigRet));
+    case TX_TRUE:
+        return true;
     }
     return false;
 }
@@ -229,6 +231,7 @@ static CScript CombineSignatures(const CScript& scriptPubKey, const BaseSignatur
     case TX_NONSTANDARD:
     case TX_NULL_DATA:
     case TX_WITHDRAW_LOCK:
+    case TX_TRUE:
         // Don't know anything about this, assume bigger one is correct:
         if (sigs1.size() >= sigs2.size())
             return PushAll(sigs1);
diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index 1c8afa3488..6818afc476 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -32,6 +32,7 @@ const char* GetTxnOutputType(txnouttype t)
     case TX_NULL_DATA: return "nulldata";
     case TX_WITHDRAW_LOCK: return "withdraw";
     case TX_WITHDRAW_OUT: return "withdrawout";
+    case TX_TRUE: return "true";
     }
     return NULL;
 }
@@ -58,6 +59,9 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
         if (GetBoolArg("-datacarrier", true))
             mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
         mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN));
+
+        // OP_TRUE scriptPubKey
+        mTemplates.insert(make_pair(TX_TRUE, CScript() << OP_TRUE));
     }
 
     // Shortcut for pay-to-script-hash, which are more constrained than the other types:
@@ -192,6 +196,8 @@ int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned c
         return vSolutions[0][0] + 1;
     case TX_SCRIPTHASH:
         return 1; // doesn't include args needed by the script
+    case TX_TRUE:
+        return 0;
     }
     return -1;
 }
@@ -202,15 +208,22 @@ bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
     if (!Solver(scriptPubKey, whichType, vSolutions))
         return false;
 
-    if (whichType == TX_MULTISIG)
-    {
-        unsigned char m = vSolutions.front()[0];
-        unsigned char n = vSolutions.back()[0];
-        // Support up to x-of-3 multisig txns as standard
-        if (n < 1 || n > 3)
-            return false;
-        if (m < 1 || m > n)
+    switch (whichType) {
+        case TX_MULTISIG:
+        {
+            unsigned char m = vSolutions.front()[0];
+            unsigned char n = vSolutions.back()[0];
+            // Support up to x-of-3 multisig txns as standard
+            if (n < 1 || n > 3)
+                return false;
+            if (m < 1 || m > n)
+                return false;
+            break;
+        }
+        case TX_TRUE:
             return false;
+        default:
+            break;
     }
 
     return whichType != TX_NONSTANDARD;
diff --git a/src/script/standard.h b/src/script/standard.h
index b521274e03..05e736c316 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -66,6 +66,7 @@ enum txnouttype
     TX_NULL_DATA,
     TX_WITHDRAW_LOCK,
     TX_WITHDRAW_OUT,
+    TX_TRUE,
 };
 
 class CNoDestination {
diff --git a/src/wallet_ismine.cpp b/src/wallet_ismine.cpp
index 37de89abf1..342b0ede24 100644
--- a/src/wallet_ismine.cpp
+++ b/src/wallet_ismine.cpp
@@ -85,6 +85,8 @@ isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
             return ISMINE_SPENDABLE;
         break;
     }
+    case TX_TRUE:
+        return ISMINE_SPENDABLE;
     }
 
     if (keystore.HaveWatchOnly(scriptPubKey))