Function removeOpcodeRaw

txscript/script.go:187–213

removeOpcodeRaw will return the script after removing any opcodes that match `opcode`. If the opcode does not appear in script, the original script will be returned unmodified. Otherwise, a new script will be allocated to contain the filtered script. This method assumes that the script parses succes

(script []byte, opcode byte)

// does not accept a script version, the results are undefined for other script
// versions.
func removeOpcodeRaw(script []byte, opcode byte) []byte {
	// Avoid work when possible.
	if len(script) == 0 {
		return script
	}

	const scriptVersion = 0
	var result []byte
	var prevOffset int32

	tokenizer := MakeScriptTokenizer(scriptVersion, script)
	for tokenizer.Next() {
		if tokenizer.Opcode() == opcode {
			if result == nil {
				result = make([]byte, 0, len(script))
				result = append(result, script[:prevOffset]...)
			}
		} else if result != nil {
			result = append(result, script[prevOffset:tokenizer.ByteIndex()]...)
		}
		prevOffset = tokenizer.ByteIndex()
	}
	if result == nil {
		return script
	}
	return result
}

// isCanonicalPush returns true if the opcode is either not a push instruction
// or the data associated with the push instruction uses the smallest