diff --git a/src/main/java/org/xerial/snappy/BitShuffle.java b/src/main/java/org/xerial/snappy/BitShuffle.java
index d5d79a6d..b2a4a6fc 100644
--- a/src/main/java/org/xerial/snappy/BitShuffle.java
+++ b/src/main/java/org/xerial/snappy/BitShuffle.java
@@ -208,35 +208,6 @@ public static int unshuffle(ByteBuffer shuffled, BitShuffleType type, ByteBuffer
         return numProcessed;
     }
 
-    /**
-     * Convert the input bit-shuffled byte array into an original byte array.
-     *
-     * @param input
-     * @return a byte array
-     * @throws IOException
-     */
-    public static byte[] unshuffleByteArray(byte[] input) throws IOException {
-        byte[] output = new byte[input.length];
-        int numProcessed = impl.unshuffle(input, 0, 1, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return output;
-    }
-
-    /**
-     * Convert the input bit-shuffled byte array into an original byte array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleByteArray(byte[] input, byte[] output) throws IOException {
-        assert(input.length == output.length);
-        int numProcessed = impl.unshuffle(input, 0, 1, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
-
     /**
      * Convert the input bit-shuffled byte array into an original short array.
      *
@@ -251,21 +222,6 @@ public static short[] unshuffleShortArray(byte[] input) throws IOException {
         return output;
     }
 
-    /**
-     * Convert the input bit-shuffled byte array into an original short array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleShortArray(byte[] input, short[] output) throws IOException {
-        assert(input.length == output.length * 2);
-        int numProcessed = impl.unshuffle(input, 0, 2, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
-
     /**
      * Convert the input bit-shuffled byte array into an original int array.
      *
@@ -280,21 +236,6 @@ public static int[] unshuffleIntArray(byte[] input) throws IOException {
         return output;
     }
 
-    /**
-     * Convert the input bit-shuffled byte array into an original int array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleIntArray(byte[] input, int[] output) throws IOException {
-        assert(input.length == output.length * 4);
-        int numProcessed = impl.unshuffle(input, 0, 4, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
-
     /**
      * Convert the input bit-shuffled byte array into an original long array.
      *
@@ -309,21 +250,6 @@ public static long[] unshuffleLongArray(byte[] input) throws IOException {
         return output;
     }
 
-    /**
-     * Convert the input bit-shuffled byte array into an original long array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleLongArray(byte[] input, long[] output) throws IOException {
-        assert(input.length == output.length * 8);
-        int numProcessed = impl.unshuffle(input, 0, 8, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
-
     /**
      * Convert the input bit-shuffled byte array into an original float array.
      *
@@ -338,21 +264,6 @@ public static float[] unshuffleFloatArray(byte[] input) throws IOException {
         return output;
     }
 
-    /**
-     * Convert the input bit-shuffled byte array into an original float array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleFloatArray(byte[] input, float[] output) throws IOException {
-        assert(input.length == output.length * 4);
-        int numProcessed = impl.unshuffle(input, 0, 4, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
-
     /**
      * Convert the input bit-shuffled byte array into an original double array.
      *
@@ -366,19 +277,4 @@ public static double[] unshuffleDoubleArray(byte[] input) throws IOException {
         assert(numProcessed == input.length);
         return output;
     }
-
-    /**
-     * Convert the input bit-shuffled byte array into an original double array.
-     *
-     * @param input
-     * @param output
-     * @return byte size of the unshuffled data.
-     * @throws IOException
-     */
-    public static int unshuffleDoubleArray(byte[] input, double[] output) throws IOException {
-        assert(input.length == output.length * 8);
-        int numProcessed = impl.unshuffle(input, 0, 8, input.length, output, 0);
-        assert(numProcessed == input.length);
-        return numProcessed;
-    }
 }
diff --git a/src/test/java/org/xerial/snappy/BitShuffleTest.java b/src/test/java/org/xerial/snappy/BitShuffleTest.java
index 4b008b73..8dfa6bec 100644
--- a/src/test/java/org/xerial/snappy/BitShuffleTest.java
+++ b/src/test/java/org/xerial/snappy/BitShuffleTest.java
@@ -276,22 +276,6 @@ public void shuffleLongArray()
         byte[] shuffledData = BitShuffle.shuffle(data);
         long[] result = BitShuffle.unshuffleLongArray(shuffledData);
         assertArrayEquals(data, result);
-        long[] output = new long[data.length];
-        BitShuffle.unshuffleLongArray(shuffledData, output);
-        assertArrayEquals(data, output);
-    }
-
-    @Test
-    public void shuffleByteArray()
-            throws Exception
-    {
-        byte[] data = new byte[] {43, -32, 1, 3, 34, 43, 34, Byte.MAX_VALUE, -1};
-        byte[] shuffledData = BitShuffle.shuffle(data);
-        byte[] result = BitShuffle.unshuffleByteArray(shuffledData);
-        assertArrayEquals(data, result);
-        byte[] output = new byte[data.length];
-        BitShuffle.unshuffleByteArray(shuffledData, output);
-        assertArrayEquals(data, output);
     }
 
     @Test
@@ -302,9 +286,6 @@ public void shuffleShortArray()
         byte[] shuffledData = BitShuffle.shuffle(data);
         short[] result = BitShuffle.unshuffleShortArray(shuffledData);
         assertArrayEquals(data, result);
-        short[] output = new short[data.length];
-        BitShuffle.unshuffleShortArray(shuffledData, output);
-        assertArrayEquals(data, output);
     }
 
     @Test
@@ -315,9 +296,6 @@ public void shuffleIntArray()
         byte[] shuffledData = BitShuffle.shuffle(data);
         int[] result = BitShuffle.unshuffleIntArray(shuffledData);
         assertArrayEquals(data, result);
-        int[] output = new int[data.length];
-        BitShuffle.unshuffleIntArray(shuffledData, output);
-        assertArrayEquals(data, output);
     }
 
     @Test
@@ -328,9 +306,6 @@ public void shuffleFloatArray()
         byte[] shuffledData = BitShuffle.shuffle(data);
         float[] result = BitShuffle.unshuffleFloatArray(shuffledData);
         assertArrayEquals(data, result, 0.0000001f);
-        float[] output = new float[data.length];
-        BitShuffle.unshuffleFloatArray(shuffledData, output);
-        assertArrayEquals(data, output);
     }
 
     @Test
@@ -341,8 +316,5 @@ public void shuffleDoubleArray()
         byte[] shuffledData = BitShuffle.shuffle(data);
         double[] result = BitShuffle.unshuffleDoubleArray(shuffledData);
         assertArrayEquals(data, result, 0.0000001f);
-        double[] output = new double[data.length];
-        BitShuffle.unshuffleDoubleArray(shuffledData, output);
-        assertArrayEquals(data, output);
     }
 }