Bug 890: Adding versatile Bitstream implementation

We already have several locations where bitstream operations are required and
partially implemented (JPEG decoder, media parsing, ..)
as well as endian related conversion (elf parser, ..).

Create a versatile Bitstream class allowing:
  - Utilize I/O operations on I/O streams, buffers and arrays
  - Consider MSBfirst / LSBfirst mode
  - Linear bit R/W operations
  - Bulk R/W operations w/ endian related type conversion
  - Allow mark/reset and switching streams and input/output mode
  - Optimized operations

Complete set of unit tests included, covering hopefully all cases.

1 files changed, 133 insertions, 0 deletions

diff --git a/src/junit/com/jogamp/common/util/TestBitstream02.java b/src/junit/com/jogamp/common/util/TestBitstream02.java
new file mode 100644
index 0000000..dc7333c
--- /dev/null
+++ b/src/junit/com/jogamp/common/util/TestBitstream02.java
@@ -0,0 +1,133 @@
+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package com.jogamp.common.util;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.jogamp.common.nio.Buffers;
+import com.jogamp.junit.util.JunitTracer;
+
+import static com.jogamp.common.util.BitstreamData.*;
+
+import org.junit.FixMethodOrder;
+import org.junit.runners.MethodSorters;
+
+/**
+ * Test {@link Bitstream} w/ int8 read/write access w/ semantics
+ * as well as with aligned and unaligned access.
+ * <ul>
+ *  <li>{@link Bitstream#readInt8(boolean, boolean)}</li>
+ *  <li>{@link Bitstream#writeInt8(boolean, boolean, byte)}</li>
+ * </ul>
+ */
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class TestBitstream02 extends JunitTracer {
+
+    @Test
+    public void test01Int8BitsAligned() throws IOException {
+        test01Int8BitsAlignedImpl((byte)0);
+        test01Int8BitsAlignedImpl((byte)1);
+        test01Int8BitsAlignedImpl((byte)7);
+        test01Int8BitsAlignedImpl(Byte.MIN_VALUE);
+        test01Int8BitsAlignedImpl(Byte.MAX_VALUE);
+        test01Int8BitsAlignedImpl((byte)0xff);
+    }
+    void test01Int8BitsAlignedImpl(byte val8) throws IOException {
+        // Test with buffer defined value
+        final ByteBuffer bb = ByteBuffer.allocate(Buffers.SIZEOF_BYTE);
+        System.err.println("XXX Test01Int8BitsAligned: value "+val8+", "+toHexBinaryString(val8, 8));
+        bb.put(0, val8);
+
+        final Bitstream.ByteBufferStream bbs = new Bitstream.ByteBufferStream(bb);
+        final Bitstream<ByteBuffer> bs = new Bitstream<ByteBuffer>(bbs, false /* outputMode */);
+        {
+            final byte r8 = (byte) bs.readInt8(true /* msbFirst */);
+            System.err.println("Read8.1 "+r8+", "+toHexBinaryString(r8, 8));
+            Assert.assertEquals(val8, r8);
+        }
+
+        // Test with written bitstream value
+        bs.setStream(bs.getSubStream(), true /* outputMode */);
+        bs.writeInt8(true /* msbFirst */, val8);
+        bs.setStream(bs.getSubStream(), false /* outputMode */); // switch to input-mode, implies flush()
+        {
+            final byte r8 = (byte) bs.readInt8(true /* msbFirst */);
+            System.err.println("Read8.2 "+r8+", "+toHexBinaryString(r8, 8));
+            Assert.assertEquals(val8, r8);
+        }
+    }
+
+    @Test
+    public void test02Int8BitsUnaligned() throws IOException {
+        test02Int8BitsUnalignedImpl(0);
+        test02Int8BitsUnalignedImpl(1);
+        test02Int8BitsUnalignedImpl(7);
+        test02Int8BitsUnalignedImpl(8);
+        test02Int8BitsUnalignedImpl(15);
+        test02Int8BitsUnalignedImpl(24);
+        test02Int8BitsUnalignedImpl(25);
+    }
+    void test02Int8BitsUnalignedImpl(final int preBits) throws IOException {
+        test02Int8BitsUnalignedImpl(preBits, (byte)0);
+        test02Int8BitsUnalignedImpl(preBits, (byte)1);
+        test02Int8BitsUnalignedImpl(preBits, (byte)7);
+        test02Int8BitsUnalignedImpl(preBits, Byte.MIN_VALUE);
+        test02Int8BitsUnalignedImpl(preBits, Byte.MAX_VALUE);
+        test02Int8BitsUnalignedImpl(preBits, (byte)0xff);
+    }
+    void test02Int8BitsUnalignedImpl(int preBits, byte val8) throws IOException {
+        final int preBytes = ( preBits + 7 ) >>> 3;
+        final int byteCount = preBytes + Buffers.SIZEOF_BYTE;
+        final ByteBuffer bb = ByteBuffer.allocate(byteCount);
+        System.err.println("XXX Test02Int8BitsUnaligned: preBits "+preBits+", value "+val8+", "+toHexBinaryString(val8, 8));
+
+        // Test with written bitstream value
+        final Bitstream.ByteBufferStream bbs = new Bitstream.ByteBufferStream(bb);
+        final Bitstream<ByteBuffer> bs = new Bitstream<ByteBuffer>(bbs, true /* outputMode */);
+        bs.writeBits31(true /* msbFirst */, preBits, 0);
+        bs.writeInt8(true /* msbFirst */, val8);
+        bs.setStream(bs.getSubStream(), false /* outputMode */); // switch to input-mode, implies flush()
+
+        final int rPre = (short) bs.readBits31(true /* msbFirst */, preBits);
+        final byte r8 = (byte) bs.readInt8(true /* msbFirst */);
+        System.err.println("ReadPre "+rPre+", "+toBinaryString(rPre, preBits));
+        System.err.println("Read8 "+r8+", "+toHexBinaryString(r8, 8));
+        Assert.assertEquals(val8, r8);
+    }
+
+    public static void main(String args[]) throws IOException {
+        String tstname = TestBitstream02.class.getName();
+        org.junit.runner.JUnitCore.main(tstname);
+    }
+
+}