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-rw-r--r--src/script/script.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/script/script.cpp b/src/script/script.cpp
index 65e5405ebd..7f25d915a8 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;
+}