From 244a1e1482631db89e7290047c18066df66ecd4b Mon Sep 17 00:00:00 2001
From: Alistair Miles <alimanfoo@googlemail.com>
Date: Mon, 11 Apr 2016 21:20:34 +0100
Subject: [PATCH 1/2] move c-blosc to v1.8.1

---
 c-blosc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/c-blosc b/c-blosc
index 824f31b540..25780abdec 160000
--- a/c-blosc
+++ b/c-blosc
@@ -1 +1 @@
-Subproject commit 824f31b5401904d82a74aa86fbde18db9fc48a4a
+Subproject commit 25780abdec0c63c7188df1e66ce92ca6a60eebe1

From fb807b943bdc13a0970c62edb80718b155704648 Mon Sep 17 00:00:00 2001
From: Alistair Miles <alimanfoo@googlemail.com>
Date: Mon, 11 Apr 2016 21:42:12 +0100
Subject: [PATCH 2/2] add test for effect of bitshuffle

---
 zarr/tests/test_chunk.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/zarr/tests/test_chunk.py b/zarr/tests/test_chunk.py
index 233ae6ef05..32f3899acb 100644
--- a/zarr/tests/test_chunk.py
+++ b/zarr/tests/test_chunk.py
@@ -231,3 +231,24 @@ def create_chunk(self, **kwargs):
             lambda: os.remove(path) if os.path.exists(path) else None
         )
         return SynchronizedPersistentChunk(**kwargs)
+
+
+def test_shuffles():
+
+    # setup
+    a = np.arange(256, dtype='u1')
+    # no shuffle
+    c0 = Chunk(shape=a.shape, dtype=a.dtype, shuffle=0)
+    c0[:] = a
+    # byte shuffle
+    c1 = Chunk(shape=a.shape, dtype=a.dtype, shuffle=1)
+    c1[:] = a
+    # bit shuffle
+    c2 = Chunk(shape=a.shape, dtype=a.dtype, shuffle=2)
+    c2[:] = a
+
+    # expect no effect of byte shuffle because using single byte dtype
+    assert c0.cbytes == c1.cbytes
+
+    # expect improvement from bitshuffle
+    assert c2.cbytes < c1.cbytes