Remove bignum dependency for scripts

Rebased-From: 48d8eb1 27bff74 4f497cd 05e3ecf 90320d6 b1fdd54

1 files changed, 17 insertions, 28 deletions

diff --git a/src/script.cpp b/src/script.cpp
index 810ba16d28..81d2754453 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -5,7 +5,6 @@
 
 #include "script.h"
 
-#include "bignum.h"
 #include "core.h"
 #include "hash.h"
 #include "key.h"
@@ -25,22 +24,13 @@ typedef vector<unsigned char> valtype;
 static const valtype vchFalse(0);
 static const valtype vchZero(0);
 static const valtype vchTrue(1, 1);
-static const CBigNum bnZero(0);
-static const CBigNum bnOne(1);
-static const CBigNum bnFalse(0);
-static const CBigNum bnTrue(1);
-static const size_t nMaxNumSize = 4;
+static const CScriptNum bnZero(0);
+static const CScriptNum bnOne(1);
+static const CScriptNum bnFalse(0);
+static const CScriptNum bnTrue(1);
 
 bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
 
-CBigNum CastToBigNum(const valtype& vch)
-{
-    if (vch.size() > nMaxNumSize)
-        throw runtime_error("CastToBigNum() : overflow");
-    // Get rid of extra leading zeros
-    return CBigNum(CBigNum(vch).getvch());
-}
-
 bool CastToBool(const valtype& vch)
 {
     for (unsigned int i = 0; i < vch.size(); i++)
@@ -306,7 +296,6 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
 
 bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType)
 {
-    CAutoBN_CTX pctx;
     CScript::const_iterator pc = script.begin();
     CScript::const_iterator pend = script.end();
     CScript::const_iterator pbegincodehash = script.begin();
@@ -380,7 +369,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                 case OP_16:
                 {
                     // ( -- value)
-                    CBigNum bn((int)opcode - (int)(OP_1 - 1));
+                    CScriptNum bn((int)opcode - (int)(OP_1 - 1));
                     stack.push_back(bn.getvch());
                 }
                 break;
@@ -556,7 +545,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                 case OP_DEPTH:
                 {
                     // -- stacksize
-                    CBigNum bn(stack.size());
+                    CScriptNum bn(stack.size());
                     stack.push_back(bn.getvch());
                 }
                 break;
@@ -606,7 +595,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
                     if (stack.size() < 2)
                         return false;
-                    int n = CastToBigNum(stacktop(-1)).getint();
+                    int n = CScriptNum(stacktop(-1)).getint();
                     popstack(stack);
                     if (n < 0 || n >= (int)stack.size())
                         return false;
@@ -654,7 +643,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     // (in -- in size)
                     if (stack.size() < 1)
                         return false;
-                    CBigNum bn(stacktop(-1).size());
+                    CScriptNum bn(stacktop(-1).size());
                     stack.push_back(bn.getvch());
                 }
                 break;
@@ -705,7 +694,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     // (in -- out)
                     if (stack.size() < 1)
                         return false;
-                    CBigNum bn = CastToBigNum(stacktop(-1));
+                    CScriptNum bn(stacktop(-1));
                     switch (opcode)
                     {
                     case OP_1ADD:       bn += bnOne; break;
@@ -738,9 +727,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     // (x1 x2 -- out)
                     if (stack.size() < 2)
                         return false;
-                    CBigNum bn1 = CastToBigNum(stacktop(-2));
-                    CBigNum bn2 = CastToBigNum(stacktop(-1));
-                    CBigNum bn;
+                    CScriptNum bn1(stacktop(-2));
+                    CScriptNum bn2(stacktop(-1));
+                    CScriptNum bn(0);
                     switch (opcode)
                     {
                     case OP_ADD:
@@ -783,9 +772,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     // (x min max -- out)
                     if (stack.size() < 3)
                         return false;
-                    CBigNum bn1 = CastToBigNum(stacktop(-3));
-                    CBigNum bn2 = CastToBigNum(stacktop(-2));
-                    CBigNum bn3 = CastToBigNum(stacktop(-1));
+                    CScriptNum bn1(stacktop(-3));
+                    CScriptNum bn2(stacktop(-2));
+                    CScriptNum bn3(stacktop(-1));
                     bool fValue = (bn2 <= bn1 && bn1 < bn3);
                     popstack(stack);
                     popstack(stack);
@@ -882,7 +871,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     if ((int)stack.size() < i)
                         return false;
 
-                    int nKeysCount = CastToBigNum(stacktop(-i)).getint();
+                    int nKeysCount = CScriptNum(stacktop(-i)).getint();
                     if (nKeysCount < 0 || nKeysCount > 20)
                         return false;
                     nOpCount += nKeysCount;
@@ -893,7 +882,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     if ((int)stack.size() < i)
                         return false;
 
-                    int nSigsCount = CastToBigNum(stacktop(-i)).getint();
+                    int nSigsCount = CScriptNum(stacktop(-i)).getint();
                     if (nSigsCount < 0 || nSigsCount > nKeysCount)
                         return false;
                     int isig = ++i;