/*
* // script.h lines 527-562
* bool GetOp2(const_iterator &pc, opcodetype &opcodeRet,
* std::vector<uint8_t> *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 = (opcodetype)opcode;
* return true;
* }
*/
public static (bool ok, KzOp op) TryRead(ref ReadOnlySequence <byte> ros, out long consumed)
{
var op = new KzOp();
var ok = op.TryReadOp(ref ros, out consumed);
return(ok, op);
}
public int FindAndDelete(KzValType vchSig)
{
int nFound = 0;
var s = _script;
var r = s;
if (vchSig.Length == 0)
{
return(nFound);
}
var op = new KzOp();
var consumed = 0L;
var offset = 0L;
var o = vchSig.Sequence;
var oLen = o.Length;
do
{
offset += consumed;
while (s.StartsWith(o))
{
r = r.RemoveSlice(offset, oLen);
s = s.Slice(oLen);
++nFound;
}
} while (op.TryReadOp(ref s, out consumed));
_script = r;
return(nFound);
#if false
CScript result;
iterator pc = begin(), pc2 = begin();
opcodetype opcode;
do
{
result.insert(result.end(), pc2, pc);
while (static_cast <size_t>(end() - pc) >= b.size() &&
std::equal(b.begin(), b.end(), pc))
{
pc = pc + b.size();
++nFound;
}
pc2 = pc;
} while (GetOp(pc, opcode));
if (nFound > 0)
{
result.insert(result.end(), pc2, end());
*this = result;
}
#endif
}
/// <summary>
/// Decode script opcodes and push data.
/// </summary>
/// <returns></returns>
public IEnumerable <KzOp> Decode()
{
var ros = _script;
while (ros.Length > 0)
{
var op = new KzOp();
if (!op.TryReadOp(ref ros))
{
goto fail;
}
yield return(op);
}
fail:
;
}
public bool IsPushOnly()
{
var ros = _script;
var op = new KzOp();
while (ros.Length > 0)
{
if (!op.TryReadOp(ref ros))
{
return(false);
}
// Note that IsPushOnly() *does* consider OP_RESERVED to be a push-type
// opcode, however execution of OP_RESERVED fails, so it's not relevant
// to P2SH/BIP62 as the scriptSig would fail prior to the P2SH special
// validation code being executed.
if (op.Code > KzOpcode.OP_16)
{
return(false);
}
}
return(true);
}