script: move CScriptID to standard.h and add a ctor for creating them from CScripts

This allows for a reversal of the current behavior.

This:
CScript foo;
CScriptID bar(foo.GetID());

Becomes:
CScript foo;
CScriptID bar(foo);

This way, CScript is no longer dependent on CScriptID or Hash();

src/crypter.cpp

@@ -5,6 +5,7 @@
 #include "crypter.h"
 
 #include "script/script.h"
+#include "script/standard.h"
 #include "util.h"
 
 #include <string>

src/key.h

@@ -30,14 +30,6 @@ public:
     CKeyID(const uint160& in) : uint160(in) {}
 };
 
-/** A reference to a CScript: the Hash160 of its serialization (see script.h) */
-class CScriptID : public uint160
-{
-public:
-    CScriptID() : uint160(0) {}
-    CScriptID(const uint160& in) : uint160(in) {}
-};
-
 /** An encapsulated public key. */
 class CPubKey
 {

src/keystore.cpp

@@ -8,6 +8,7 @@
 #include "crypter.h"
 #include "key.h"
 #include "script/script.h"
+#include "script/standard.h"
 #include "util.h"
 
 #include <boost/foreach.hpp>
@@ -38,7 +39,7 @@ bool CBasicKeyStore::AddCScript(const CScript& redeemScript)
         return error("CBasicKeyStore::AddCScript() : redeemScripts > %i bytes are invalid", MAX_SCRIPT_ELEMENT_SIZE);
 
     LOCK(cs_KeyStore);
-    mapScripts[redeemScript.GetID()] = redeemScript;
+    mapScripts[CScriptID(redeemScript)] = redeemScript;
     return true;
 }
 

src/keystore.h

@@ -13,6 +13,7 @@
 #include <boost/variant.hpp>
 
 class CScript;
+class CScriptID;
 
 /** A virtual base class for key stores */
 class CKeyStore

src/rpcmisc.cpp

@@ -292,7 +292,7 @@ Value createmultisig(const Array& params, bool fHelp)
 
     // Construct using pay-to-script-hash:
     CScript inner = _createmultisig_redeemScript(params);
-    CScriptID innerID = inner.GetID();
+    CScriptID innerID(inner);
     CBitcoinAddress address(innerID);
 
     Object result;

src/rpcrawtransaction.cpp

@@ -480,7 +480,7 @@ Value decodescript(const Array& params, bool fHelp)
     }
     ScriptPubKeyToJSON(script, r, false);
 
-    r.push_back(Pair("p2sh", CBitcoinAddress(script.GetID()).ToString()));
+    r.push_back(Pair("p2sh", CBitcoinAddress(CScriptID(script)).ToString()));
     return r;
 }
 

src/rpcwallet.cpp

@@ -918,7 +918,7 @@ Value addmultisigaddress(const Array& params, bool fHelp)
 
     // Construct using pay-to-script-hash:
     CScript inner = _createmultisig_redeemScript(params);
-    CScriptID innerID = inner.GetID();
+    CScriptID innerID(inner);
     pwalletMain->AddCScript(inner);
 
     pwalletMain->SetAddressBook(innerID, strAccount, "send");

src/script/compressor.cpp

@@ -4,6 +4,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "compressor.h"
+#include "script/standard.h"
 
 bool CScriptCompressor::IsToKeyID(CKeyID &hash) const
 {

src/script/compressor.h

@@ -8,6 +8,8 @@
 
 #include "script/script.h"
 
+class CScriptID;
+
 /** Compact serializer for scripts.
  *
  *  It detects common cases and encodes them much more efficiently.

src/script/script.h

@@ -610,12 +610,6 @@ public:
         }
         return str;
     }
-
-    CScriptID GetID() const
-    {
-        return CScriptID(Hash160(*this));
-    }
-
     void clear()
     {
         // The default std::vector::clear() does not release memory.

src/script/standard.cpp

@@ -14,6 +14,8 @@ using namespace std;
 
 typedef vector<unsigned char> valtype;
 
+CScriptID::CScriptID(const CScript& in) : uint160(in.size() ? Hash160(in.begin(), in.end()) : 0) {}
+
 const char* GetTxnOutputType(txnouttype t)
 {
     switch (t)

src/script/standard.h

@@ -13,6 +13,15 @@
 
 class CScript;
 
+/** A reference to a CScript: the Hash160 of its serialization (see script.h) */
+class CScriptID : public uint160
+{
+public:
+    CScriptID() : uint160(0) {}
+    CScriptID(const CScript& in);
+    CScriptID(const uint160& in) : uint160(in) {}
+};
+
 static const unsigned int MAX_OP_RETURN_RELAY = 40;      // bytes
 
 // Mandatory script verification flags that all new blocks must comply with for

src/test/miner_tests.cpp

@@ -170,7 +170,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vin[0].scriptSig = CScript() << OP_1;
     tx.vout[0].nValue = 4900000000LL;
     script = CScript() << OP_0;
-    tx.vout[0].scriptPubKey = GetScriptForDestination(script.GetID());
+    tx.vout[0].scriptPubKey = GetScriptForDestination(CScriptID(script));
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
     tx.vin[0].prevout.hash = hash;

src/test/script_P2SH_tests.cpp

@@ -75,7 +75,7 @@ BOOST_AUTO_TEST_CASE(sign)
     for (int i = 0; i < 4; i++)
     {
         keystore.AddCScript(standardScripts[i]);
-        evalScripts[i] = GetScriptForDestination(standardScripts[i].GetID());
+        evalScripts[i] = GetScriptForDestination(CScriptID(standardScripts[i]));
     }
 
     CMutableTransaction txFrom;  // Funding transaction:
@@ -129,7 +129,7 @@ BOOST_AUTO_TEST_CASE(norecurse)
     CScript invalidAsScript;
     invalidAsScript << OP_INVALIDOPCODE << OP_INVALIDOPCODE;
 
-    CScript p2sh = GetScriptForDestination(invalidAsScript.GetID());
+    CScript p2sh = GetScriptForDestination(CScriptID(invalidAsScript));
 
     CScript scriptSig;
     scriptSig << Serialize(invalidAsScript);
@@ -139,7 +139,7 @@ BOOST_AUTO_TEST_CASE(norecurse)
 
     // Try to recur, and verification should succeed because
     // the inner HASH160 <> EQUAL should only check the hash:
-    CScript p2sh2 = GetScriptForDestination(p2sh.GetID());
+    CScript p2sh2 = GetScriptForDestination(CScriptID(p2sh));
     CScript scriptSig2;
     scriptSig2 << Serialize(invalidAsScript) << Serialize(p2sh);
 
@@ -169,7 +169,7 @@ BOOST_AUTO_TEST_CASE(set)
     CScript outer[4];
     for (int i = 0; i < 4; i++)
     {
-        outer[i] = GetScriptForDestination(inner[i].GetID());
+        outer[i] = GetScriptForDestination(CScriptID(inner[i]));
         keystore.AddCScript(inner[i]);
     }
 
@@ -242,7 +242,7 @@ BOOST_AUTO_TEST_CASE(switchover)
     CScript scriptSig;
     scriptSig << Serialize(notValid);
 
-    CScript fund = GetScriptForDestination(notValid.GetID());
+    CScript fund = GetScriptForDestination(CScriptID(notValid));
 
 
     // Validation should succeed under old rules (hash is correct):
@@ -275,7 +275,7 @@ BOOST_AUTO_TEST_CASE(AreInputsStandard)
     keystore.AddCScript(pay1);
     CScript pay1of3 = GetScriptForMultisig(1, keys);
 
-    txFrom.vout[0].scriptPubKey = GetScriptForDestination(pay1.GetID()); // P2SH (OP_CHECKSIG)
+    txFrom.vout[0].scriptPubKey = GetScriptForDestination(CScriptID(pay1)); // P2SH (OP_CHECKSIG)
     txFrom.vout[0].nValue = 1000;
     txFrom.vout[1].scriptPubKey = pay1; // ordinary OP_CHECKSIG
     txFrom.vout[1].nValue = 2000;
@@ -290,7 +290,7 @@ BOOST_AUTO_TEST_CASE(AreInputsStandard)
     oneAndTwo << OP_2 << key[3].GetPubKey() << key[4].GetPubKey() << key[5].GetPubKey();
     oneAndTwo << OP_3 << OP_CHECKMULTISIG;
     keystore.AddCScript(oneAndTwo);
-    txFrom.vout[3].scriptPubKey = GetScriptForDestination(oneAndTwo.GetID());
+    txFrom.vout[3].scriptPubKey = GetScriptForDestination(CScriptID(oneAndTwo));
     txFrom.vout[3].nValue = 4000;
 
     // vout[4] is max sigops:
@@ -299,17 +299,17 @@ BOOST_AUTO_TEST_CASE(AreInputsStandard)
         fifteenSigops << key[i%3].GetPubKey();
     fifteenSigops << OP_15 << OP_CHECKMULTISIG;
     keystore.AddCScript(fifteenSigops);
-    txFrom.vout[4].scriptPubKey = GetScriptForDestination(fifteenSigops.GetID());
+    txFrom.vout[4].scriptPubKey = GetScriptForDestination(CScriptID(fifteenSigops));
     txFrom.vout[4].nValue = 5000;
 
     // vout[5/6] are non-standard because they exceed MAX_P2SH_SIGOPS
     CScript sixteenSigops; sixteenSigops << OP_16 << OP_CHECKMULTISIG;
     keystore.AddCScript(sixteenSigops);
-    txFrom.vout[5].scriptPubKey = GetScriptForDestination(fifteenSigops.GetID());
+    txFrom.vout[5].scriptPubKey = GetScriptForDestination(CScriptID(fifteenSigops));
     txFrom.vout[5].nValue = 5000;
     CScript twentySigops; twentySigops << OP_CHECKMULTISIG;
     keystore.AddCScript(twentySigops);
-    txFrom.vout[6].scriptPubKey = GetScriptForDestination(twentySigops.GetID());
+    txFrom.vout[6].scriptPubKey = GetScriptForDestination(CScriptID(twentySigops));
     txFrom.vout[6].nValue = 6000;
 
     coins.ModifyCoins(txFrom.GetHash())->FromTx(txFrom, 0);

src/test/script_tests.cpp

@@ -162,7 +162,7 @@ public:
     TestBuilder(const CScript& redeemScript, const std::string& comment_, int flags_, bool P2SH = false) : scriptPubKey(redeemScript), havePush(false), comment(comment_), flags(flags_)
     {
         if (P2SH) {
-            creditTx = BuildCreditingTransaction(CScript() << OP_HASH160 << redeemScript.GetID() << OP_EQUAL);
+            creditTx = BuildCreditingTransaction(CScript() << OP_HASH160 << CScriptID(redeemScript) << OP_EQUAL);
         } else {
             creditTx = BuildCreditingTransaction(redeemScript);
         }
@@ -697,7 +697,7 @@ BOOST_AUTO_TEST_CASE(script_combineSigs)
     // P2SH, single-signature case:
     CScript pkSingle; pkSingle << keys[0].GetPubKey() << OP_CHECKSIG;
     keystore.AddCScript(pkSingle);
-    scriptPubKey = GetScriptForDestination(pkSingle.GetID());
+    scriptPubKey = GetScriptForDestination(CScriptID(pkSingle));
     SignSignature(keystore, txFrom, txTo, 0);
     combined = CombineSignatures(scriptPubKey, txTo, 0, scriptSig, empty);
     BOOST_CHECK(combined == scriptSig);

src/test/sigopcount_tests.cpp

@@ -38,7 +38,7 @@ BOOST_AUTO_TEST_CASE(GetSigOpCount)
     BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 3U);
     BOOST_CHECK_EQUAL(s1.GetSigOpCount(false), 21U);
 
-    CScript p2sh = GetScriptForDestination(s1.GetID());
+    CScript p2sh = GetScriptForDestination(CScriptID(s1));
     CScript scriptSig;
     scriptSig << OP_0 << Serialize(s1);
     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig), 3U);
@@ -54,7 +54,7 @@ BOOST_AUTO_TEST_CASE(GetSigOpCount)
     BOOST_CHECK_EQUAL(s2.GetSigOpCount(true), 3U);
     BOOST_CHECK_EQUAL(s2.GetSigOpCount(false), 20U);
 
-    p2sh = GetScriptForDestination(s2.GetID());
+    p2sh = GetScriptForDestination(CScriptID(s2));
     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(true), 0U);
     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(false), 0U);
     CScript scriptSig2;

src/wallet.cpp

@@ -158,7 +158,7 @@ bool CWallet::LoadCScript(const CScript& redeemScript)
      * these. Do not add them to the wallet and warn. */
     if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE)
     {
-        std::string strAddr = CBitcoinAddress(redeemScript.GetID()).ToString();
+        std::string strAddr = CBitcoinAddress(CScriptID(redeemScript)).ToString();
         LogPrintf("%s: Warning: This wallet contains a redeemScript of size %i which exceeds maximum size %i thus can never be redeemed. Do not use address %s.\n",
             __func__, redeemScript.size(), MAX_SCRIPT_ELEMENT_SIZE, strAddr);
         return true;