From 466d5bc779ad45f5923d0f59efbc5d696bf2099c Mon Sep 17 00:00:00 2001
From: siddontang <siddontang@gmail.com>
Date: Wed, 24 Sep 2014 12:53:04 +0800
Subject: [PATCH] update num

---
 num/bytes.go    | 30 ++++++++++++++++++++++++++++++
 num/num_test.go | 12 ++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/num/bytes.go b/num/bytes.go
index b873330..1f3def7 100644
--- a/num/bytes.go
+++ b/num/bytes.go
@@ -35,3 +35,33 @@ func Uint64ToBytes(u uint64) []byte {
 	binary.BigEndian.PutUint64(buf, u)
 	return buf
 }
+
+func BytesToInt16(b []byte) int16 {
+	return int16(binary.BigEndian.Uint16(b))
+}
+
+func Int16ToBytes(u int16) []byte {
+	buf := make([]byte, 2)
+	binary.BigEndian.PutUint16(buf, uint16(u))
+	return buf
+}
+
+func BytesToInt32(b []byte) int32 {
+	return int32(binary.BigEndian.Uint32(b))
+}
+
+func Int32ToBytes(u int32) []byte {
+	buf := make([]byte, 4)
+	binary.BigEndian.PutUint32(buf, uint32(u))
+	return buf
+}
+
+func BytesToInt64(b []byte) int64 {
+	return int64(binary.BigEndian.Uint64(b))
+}
+
+func Int64ToBytes(u int64) []byte {
+	buf := make([]byte, 8)
+	binary.BigEndian.PutUint64(buf, uint64(u))
+	return buf
+}
diff --git a/num/num_test.go b/num/num_test.go
index ab3bcac..9c64481 100644
--- a/num/num_test.go
+++ b/num/num_test.go
@@ -144,6 +144,18 @@ func TestBytes(t *testing.T) {
 	if BytesToUint16(Uint16ToBytes(1)) != 1 {
 		t.Fatal("convert fail")
 	}
+
+	if BytesToInt64(Int64ToBytes(-1)) != -1 {
+		t.Fatal("convert fail")
+	}
+
+	if BytesToInt32(Int32ToBytes(-1)) != -1 {
+		t.Fatal("convert fail")
+	}
+
+	if BytesToInt16(Int16ToBytes(-1)) != -1 {
+		t.Fatal("convert fail")
+	}
 }
 
 func TestStr(t *testing.T) {