From 54a5a21158f740990048b1d43c641630744cf3ee Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Wed, 4 Apr 2018 09:14:13 -0700
Subject: [PATCH] [MOVEONLY] Turn CScript::GetOp2 into a function and move to
 cpp

---
 src/core_write.cpp    |  2 +-
 src/script/script.cpp | 52 +++++++++++++++++++++++++++++++++++++++
 src/script/script.h   | 57 +++----------------------------------------
 3 files changed, 57 insertions(+), 54 deletions(-)

diff --git a/src/core_write.cpp b/src/core_write.cpp
index 54b18a493..58d3aad5b 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -34,7 +34,7 @@ std::string FormatScript(const CScript& script)
     while (it != script.end()) {
         CScript::const_iterator it2 = it;
         std::vector<unsigned char> vch;
-        if (script.GetOp2(it, op, &vch)) {
+        if (script.GetOp(it, op, vch)) {
             if (op == OP_0) {
                 ret += "0 ";
                 continue;
diff --git a/src/script/script.cpp b/src/script/script.cpp
index 65e5405eb..7f25d915a 100644
--- a/src/script/script.cpp
+++ b/src/script/script.cpp
@@ -280,3 +280,55 @@ bool CScript::HasValidOps() const
     }
     return true;
 }
+
+bool GetScriptOp(CScriptBase::const_iterator& pc, CScriptBase::const_iterator end, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet)
+{
+    opcodeRet = OP_INVALIDOPCODE;
+    if (pvchRet)
+        pvchRet->clear();
+    if (pc >= end)
+        return false;
+
+    // Read instruction
+    if (end - pc < 1)
+        return false;
+    unsigned int opcode = *pc++;
+
+    // Immediate operand
+    if (opcode <= OP_PUSHDATA4)
+    {
+        unsigned int nSize = 0;
+        if (opcode < OP_PUSHDATA1)
+        {
+            nSize = opcode;
+        }
+        else if (opcode == OP_PUSHDATA1)
+        {
+            if (end - pc < 1)
+                return false;
+            nSize = *pc++;
+        }
+        else if (opcode == OP_PUSHDATA2)
+        {
+            if (end - pc < 2)
+                return false;
+            nSize = ReadLE16(&pc[0]);
+            pc += 2;
+        }
+        else if (opcode == OP_PUSHDATA4)
+        {
+            if (end - pc < 4)
+                return false;
+            nSize = ReadLE32(&pc[0]);
+            pc += 4;
+        }
+        if (end - pc < 0 || (unsigned int)(end - pc) < nSize)
+            return false;
+        if (pvchRet)
+            pvchRet->assign(pc, pc + nSize);
+        pc += nSize;
+    }
+
+    opcodeRet = static_cast<opcodetype>(opcode);
+    return true;
+}
diff --git a/src/script/script.h b/src/script/script.h
index c06e320a1..d8b7c0601 100644
--- a/src/script/script.h
+++ b/src/script/script.h
@@ -385,6 +385,8 @@ private:
  */
 typedef prevector<28, unsigned char> CScriptBase;
 
+bool GetScriptOp(CScriptBase::const_iterator& pc, CScriptBase::const_iterator end, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet);
+
 /** Serialized script, used inside transaction inputs and outputs */
 class CScript : public CScriptBase
 {
@@ -495,65 +497,14 @@ public:
 
     bool GetOp(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet) const
     {
-        return GetOp2(pc, opcodeRet, &vchRet);
+        return GetScriptOp(pc, end(), opcodeRet, &vchRet);
     }
 
     bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
     {
-        return GetOp2(pc, opcodeRet, nullptr);
+        return GetScriptOp(pc, end(), opcodeRet, nullptr);
     }
 
-    bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
-    {
-        opcodeRet = OP_INVALIDOPCODE;
-        if (pvchRet)
-            pvchRet->clear();
-        if (pc >= end())
-            return false;
-
-        // Read instruction
-        if (end() - pc < 1)
-            return false;
-        unsigned int opcode = *pc++;
-
-        // Immediate operand
-        if (opcode <= OP_PUSHDATA4)
-        {
-            unsigned int nSize = 0;
-            if (opcode < OP_PUSHDATA1)
-            {
-                nSize = opcode;
-            }
-            else if (opcode == OP_PUSHDATA1)
-            {
-                if (end() - pc < 1)
-                    return false;
-                nSize = *pc++;
-            }
-            else if (opcode == OP_PUSHDATA2)
-            {
-                if (end() - pc < 2)
-                    return false;
-                nSize = ReadLE16(&pc[0]);
-                pc += 2;
-            }
-            else if (opcode == OP_PUSHDATA4)
-            {
-                if (end() - pc < 4)
-                    return false;
-                nSize = ReadLE32(&pc[0]);
-                pc += 4;
-            }
-            if (end() - pc < 0 || (unsigned int)(end() - pc) < nSize)
-                return false;
-            if (pvchRet)
-                pvchRet->assign(pc, pc + nSize);
-            pc += nSize;
-        }
-
-        opcodeRet = static_cast<opcodetype>(opcode);
-        return true;
-    }
 
     /** Encode/decode small integers: */
     static int DecodeOP_N(opcodetype opcode)