public static KzOp Push(ReadOnlySpan <byte> data)
{
var code = KzOpcode.OP_INVALIDOPCODE;
var val = KzValType.None;
if (data.Length == 1 && data[0] <= 16)
{
code = data[0] == 0 ? KzOpcode.OP_0 : (KzOpcode)(data[0] - 1 + (int)KzOpcode.OP_1);
}
else
{
if (data.Length < (int)KzOpcode.OP_PUSHDATA1)
{
code = (KzOpcode)data.Length;
}
else if (data.Length <= 0xff)
{
code = KzOpcode.OP_PUSHDATA1;
}
else if (data.Length <= 0xffff)
{
code = KzOpcode.OP_PUSHDATA2;
}
else
{
code = KzOpcode.OP_PUSHDATA4;
}
val = new KzValType(data.ToArray());
}
var op = new KzOp(code, val);
return(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
}
public KzValType BitXor(KzValType b)
{
if (Length != b.Length)
{
throw new InvalidOperationException();
}
var sa = ToSpan();
var sb = b.ToSpan();
var r = new byte[sa.Length];
for (var i = 0; i < sa.Length; i++)
{
r[i] = (byte)(sa[i] ^ sb[i]);
}
return(new KzValType(r));
}
public bool BitEquals(KzValType x2)
{
if (Length != x2.Length)
{
return(false);
}
var s1 = ToSpan();
var s2 = x2.ToSpan();
for (var i = 0; i < s1.Length; i++)
{
if (s1[i] != s2[i])
{
return(false);
}
}
return(true);
}
public static KzOp Push(long v)
{
var code = KzOpcode.OP_INVALIDOPCODE;
var val = KzValType.None;
if (v == -1)
{
code = KzOpcode.OP_1NEGATE;
}
else if (v >= 0 && v <= 16)
{
code = v == 0 ? KzOpcode.OP_0 : (KzOpcode)(v - 1 + (int)KzOpcode.OP_1);
}
else
{
var bytes = BitConverter.GetBytes(v).AsSpan();
if (v <= 0xff)
{
code = KzOpcode.OP_PUSH1;
val = new KzValType(bytes.Slice(0, 1).ToArray());
}
else if (v <= 0xffff)
{
code = KzOpcode.OP_PUSH2;
val = new KzValType(bytes.Slice(0, 2).ToArray());
}
else if (v <= 0xffffff)
{
code = KzOpcode.OP_PUSH3;
val = new KzValType(bytes.Slice(0, 3).ToArray());
}
else
{
code = KzOpcode.OP_PUSH4;
val = new KzValType(bytes.Slice(0, 4).ToArray());
}
}
var op = new KzOp(code, val);
return(op);
}
public KzBOp(KzValType data) : this()
{
IsFinal = true; IsRaw = true; Op = new KzOp(KzOpcode.OP_NOP, data);
}
public KzOp(KzOpcode code)
{
_code = code; _data = KzValType.None;
}
public KzOp(KzOpcode code, KzValType data)
{
_code = code; _data = data;
}
public bool TryReadOp(ref SequenceReader <byte> r)
{
_code = KzOpcode.OP_INVALIDOPCODE;
_data = KzValType.None;
if (!r.TryRead(out byte opcode))
{
goto fail;
}
_code = (KzOpcode)opcode;
// Opcodes OP_0 and OP_1 to OP_16 are single byte opcodes that push the corresponding value.
// Opcodes from zero to 0x4b [0..75] are single byte push commands where the value is the number of bytes to push.
// Opcode 0x4c (76) takes the next byte as the count and should be used for pushing [76..255] bytes.
// Opcode 0x4d (77) takes the next two bytes. Used for pushing [256..65536] bytes.
// Opcode 0x4e (78) takes the next four bytes. Used for pushing [65537..4,294,967,296] bytes.
if (opcode <= (byte)KzOpcode.OP_PUSHDATA4)
{
var nSize = 0U;
if (opcode < (byte)KzOpcode.OP_PUSHDATA1)
{
nSize = opcode;
}
else if (opcode == (byte)KzOpcode.OP_PUSHDATA1)
{
if (!r.TryRead(out byte size1))
{
goto fail;
}
nSize = size1;
}
else if (opcode == (byte)KzOpcode.OP_PUSHDATA2)
{
if (!r.TryReadLittleEndian(out UInt16 size2))
{
goto fail;
}
nSize = size2;
}
else if (opcode == (byte)KzOpcode.OP_PUSHDATA4)
{
if (!r.TryReadLittleEndian(out UInt32 size4))
{
goto fail;
}
nSize = size4;
}
if (nSize >= 0)
{
if (r.Remaining < nSize)
{
goto fail;
}
_data = new KzValType(r.Sequence.Slice(r.Position, (Int32)nSize));
r.Advance(nSize);
}
}
return(true);
fail:
return(false);
}
