Method cutOutCodesep

modules/ecash-lib/src/script.ts:123–136

* Find the n-th OP_CODESEPARATOR (0-based) and cut out the bytecode * following it. Required for signing BIP143 scripts that have an * OP_CODESEPARATOR. * * Throw an error if the n-th OP_CODESEPARATOR doesn't exist. * * Historically this opcode has been seen as obscure

(nCodesep: number)

     * If the covenant bytecode is 520 or so, this would save 519 bytes.
     */
    public cutOutCodesep(nCodesep: number): Script {
        const ops = this.ops();
        let op: Op | undefined;
        let nCodesepsFound = 0;
        while ((op = ops.next()) !== undefined) {
            if (op == OP_CODESEPARATOR) {
                if (nCodesepsFound == nCodesep) {
                    return new Script(this.bytecode.slice(ops.bytes.idx));
                }
                nCodesepsFound++;
            }
        }
        throw new Error('OP_CODESEPARATOR not found');
    }

    /**
     * Whether the Script is a P2SH Script.