Function removeOpcodeByData

txscript/script.go:258–284

removeOpcodeByData will return the script minus any opcodes that perform a canonical push of data that contains the passed data to remove. This function assumes it is provided a version 0 script as any future version of script should avoid this functionality since it is unnecessary due to the signa

(script []byte, dataToRemove []byte)

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

	// Parse through the script looking for a canonical data push that contains
	// the data to remove.
	const scriptVersion = 0
	var result []byte
	var prevOffset int32
	var match bool
	tokenizer := MakeScriptTokenizer(scriptVersion, script)
	for tokenizer.Next() {
		var found bool
		result, prevOffset, found = removeOpcodeCanonical(
			&tokenizer, script, dataToRemove, prevOffset, result,
		)
		if found {
			match = true
		}
	}
	if result == nil {
		result = script
	}
	return result, match
}

func removeOpcodeCanonical(t *ScriptTokenizer, script, dataToRemove []byte,
	prevOffset int32, result []byte) ([]byte, int32, bool) {