From fddb38126d023a742627f8ac52fdb668a0492e19 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 21 Feb 2017 15:15:29 +1030
Subject: [PATCH] utxo: wire support for unspent transactions.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 lightningd/Makefile |  3 ++-
 lightningd/utxo.c   | 37 +++++++++++++++++++++++++++++++++++++
 lightningd/utxo.h   | 24 ++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 lightningd/utxo.c
 create mode 100644 lightningd/utxo.h

diff --git a/lightningd/Makefile b/lightningd/Makefile
index 41e0077d1..1bbe7b086 100644
--- a/lightningd/Makefile
+++ b/lightningd/Makefile
@@ -39,7 +39,8 @@ LIGHTNINGD_LIB_SRC :=				\
 	lightningd/cryptomsg.c			\
 	lightningd/funding_tx.c			\
 	lightningd/htlc_tx.c			\
-	lightningd/key_derive.c
+	lightningd/key_derive.c			\
+	lightningd/utxo.c
 
 LIGHTNINGD_LIB_OBJS := $(LIGHTNINGD_LIB_SRC:.c=.o)
 LIGHTNINGD_LIB_HEADERS := $(LIGHTNINGD_LIB_SRC:.c=.h)
diff --git a/lightningd/utxo.c b/lightningd/utxo.c
new file mode 100644
index 000000000..4091eff65
--- /dev/null
+++ b/lightningd/utxo.c
@@ -0,0 +1,37 @@
+#include <lightningd/utxo.h>
+#include <wire/wire.h>
+
+void towire_utxo(u8 **pptr, const struct utxo *utxo)
+{
+	towire_sha256_double(pptr, &utxo->txid);
+	towire_u32(pptr, utxo->outnum);
+	towire_u64(pptr, utxo->amount);
+	towire_u32(pptr, utxo->keyindex);
+	towire_bool(pptr, utxo->is_p2sh);
+}
+
+void fromwire_utxo(const u8 **ptr, size_t *max, struct utxo *utxo)
+{
+	fromwire_sha256_double(ptr, max, &utxo->txid);
+	utxo->outnum = fromwire_u32(ptr, max);
+	utxo->amount = fromwire_u64(ptr, max);
+	utxo->keyindex = fromwire_u32(ptr, max);
+	utxo->is_p2sh = fromwire_bool(ptr, max);
+}
+
+void fromwire_utxo_array(const u8 **ptr, size_t *max,
+			 struct utxo *utxo, size_t num)
+{
+	size_t i;
+
+	for (i = 0; i < num; i++)
+		fromwire_utxo(ptr, max, &utxo[i]);
+}
+
+void towire_utxo_array(u8 **pptr, const struct utxo *utxo, size_t num)
+{
+	size_t i;
+
+	for (i = 0; i < num; i++)
+		towire_utxo(pptr, &utxo[i]);
+}
diff --git a/lightningd/utxo.h b/lightningd/utxo.h
new file mode 100644
index 000000000..a2eb5ca7d
--- /dev/null
+++ b/lightningd/utxo.h
@@ -0,0 +1,24 @@
+#ifndef LIGHTNING_LIGHTNINGD_UTXO_H
+#define LIGHTNING_LIGHTNINGD_UTXO_H
+#include "config.h"
+#include <bitcoin/shadouble.h>
+#include <ccan/short_types/short_types.h>
+#include <ccan/tal/tal.h>
+#include <stdbool.h>
+
+struct utxo {
+	struct sha256_double txid;
+	u32 outnum;
+	u64 amount;
+	u32 keyindex;
+	bool is_p2sh;
+};
+
+void towire_utxo(u8 **pptr, const struct utxo *utxo);
+void fromwire_utxo(const u8 **ptr, size_t *max, struct utxo *utxo);
+
+void fromwire_utxo_array(const u8 **ptr, size_t *max,
+			 struct utxo *utxo, size_t num);
+
+void towire_utxo_array(u8 **pptr, const struct utxo *utxo, size_t num);
+#endif /* LIGHTNING_LIGHTNINGD_UTXO_H */