Function encode_f

common/bolt11.c:1028–1059

}

static void encode_f(u5 **data, const u8 *fallback)
{
	struct bitcoin_address pkh;
	struct ripemd160 sh;
	struct sha256 wsh;

	/* BOLT #11:
	 *
	 * for Bitcoin payments... MUST set an `f` field to a valid
	 * witness version and program, OR to `17` followed by a
	 * public key hash, OR to `18` followed by a script hash.
	 */
	if (is_p2pkh(fallback, &pkh)) {
		push_fallback_addr(data, 17, &pkh, sizeof(pkh));
	} else if (is_p2sh(fallback, &sh)) {
		push_fallback_addr(data, 18, &sh, sizeof(sh));
	} else if (is_p2wpkh(fallback, &pkh)) {
		push_fallback_addr(data, 0, &pkh, sizeof(pkh));
	} else if (is_p2wsh(fallback, &wsh)) {
		push_fallback_addr(data, 0, &wsh, sizeof(wsh));
	} else if (tal_count(fallback)
		   && fallback[0] >= 0x50
		   && fallback[0] < (0x50+16)) {
		/* Other (future) witness versions: turn OP_N into N */
		push_fallback_addr(data, fallback[0] - 0x50, fallback + 1,
				   tal_count(fallback) - 1);
	} else {
		/* Copy raw. */
		push_field(data, 'f',
			   fallback, tal_count(fallback) * CHAR_BIT);
	}
}

static void encode_r(u5 **data, const struct route_info *r)
{