From 6f468e70038b45c506a3d5f9b1e9b5c44ca3f195 Mon Sep 17 00:00:00 2001
From: rulk <redeyerulk@gmail.com>
Date: Wed, 17 Jul 2019 20:42:26 +0300
Subject: [PATCH 1/2] added ability to export array as raw data

---
 bitarray.go      | 20 ++++++++++++++++++++
 bitarray_test.go | 24 ++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/bitarray.go b/bitarray.go
index be9ee8d..2a740ff 100644
--- a/bitarray.go
+++ b/bitarray.go
@@ -265,3 +265,23 @@ func (bits *BitArray) ToArray() []int {
 
 	return ints
 }
+
+func (bits *BitArray) ToByteArray() []byte {
+	return bits.bytes
+}
+
+// New create a new BitArray with length(bits).
+func FromByteArray(length int, data []byte) (*BitArray, error) {
+	if data == nil {
+		return nil, errors.New("data can't be nil")
+	}
+	lenpad := nwords(length) * _BytesPW
+	if len(data) != lenpad {
+		return nil, errors.New("length and size of data don't match")
+	}
+	return &BitArray{
+		lenpad: lenpad,
+		length: length,
+		bytes:  data,
+	}, nil
+}
diff --git a/bitarray_test.go b/bitarray_test.go
index d7cae30..a04c3cb 100644
--- a/bitarray_test.go
+++ b/bitarray_test.go
@@ -226,3 +226,27 @@ func TestLeq(t *testing.T) {
 
 	_testLtOrEq(t, true)
 }
+
+func TestFromByteArray(t *testing.T) {
+	fmt.Println("Test: FromByteArray")
+
+	_, e := FromByteArray(0, nil)
+	if e == nil {
+		t.Error("allowed nil data")
+	}
+
+	bits := New(64)
+	data := bits.ToByteArray()
+
+	recreatedData, e := FromByteArray(64, data)
+
+	if e != nil || recreatedData == nil {
+		t.Error("failed to re-cteate byte array", e)
+	}
+
+	recreatedData, e = FromByteArray(88, data)
+
+	if e == nil || recreatedData != nil {
+		t.Error("failed to check for correct length", e)
+	}
+}

From 4f0771c465d34dadd35040a022b19f326bbef24b Mon Sep 17 00:00:00 2001
From: rulk <redeyerulk@gmail.com>
Date: Tue, 23 Jul 2019 15:21:49 +0300
Subject: [PATCH 2/2] added public function to calculate required byte length

---
 bitarray.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bitarray.go b/bitarray.go
index 2a740ff..c754578 100644
--- a/bitarray.go
+++ b/bitarray.go
@@ -285,3 +285,8 @@ func FromByteArray(length int, data []byte) (*BitArray, error) {
 		bytes:  data,
 	}, nil
 }
+
+func BitLenToByteLen(length int) int {
+	lenpad := nwords(length) * _BytesPW
+	return lenpad
+}