fuzz: target for tx_add_output

Fuzz the decoding and encoding of tx_add_output.

tests/fuzz/fuzz-wire-tx_add_output.c

@@ -0,0 +1,45 @@
+#include "config.h"
+#include <ccan/mem/mem.h>
+#include <stdint.h>
+#include <tests/fuzz/libfuzz.h>
+#include <tests/fuzz/wire.h>
+#include <wire/peer_wire.h>
+
+struct tx_add_output {
+	struct channel_id channel_id;
+	u64 serial_id;
+	u64 sats;
+	u8 *script;
+};
+
+static void *encode(const tal_t *ctx, const struct tx_add_output *s)
+{
+	return towire_tx_add_output(ctx, &s->channel_id, s->serial_id, s->sats,
+				    s->script);
+}
+
+static struct tx_add_output *decode(const tal_t *ctx, const void *p)
+{
+	struct tx_add_output *s = tal(ctx, struct tx_add_output);
+
+	if (fromwire_tx_add_output(s, p, &s->channel_id, &s->serial_id,
+				   &s->sats, &s->script))
+		return s;
+	return tal_free(s);
+}
+
+static bool equal(const struct tx_add_output *x, const struct tx_add_output *y)
+{
+	size_t upto_script = (uintptr_t)&x->script - (uintptr_t)x;
+	if (memcmp(x, y, upto_script) != 0)
+		return false;
+
+	return memeq(x->script, tal_bytelen(x->script), y->script,
+		     tal_bytelen(y->script));
+}
+
+void run(const u8 *data, size_t size)
+{
+	test_decode_encode(data, size, WIRE_TX_ADD_OUTPUT,
+			   struct tx_add_output);
+}