1 files changed, 116 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/io/NBitOutputStream.java b/src/main/java/org/pdfbox/io/NBitOutputStream.java
new file mode 100644
index 0000000..f944b8a
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/NBitOutputStream.java
@@ -0,0 +1,116 @@
+/**
+  * Copyright (c) 2003, www.pdfbox.org
+ * 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.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE REGENTS 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.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.io;
+
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * This is an n-bit output stream.  This means that you write data in n-bit chunks.
+ *
+ * @author  Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.3 $
+ */
+public class NBitOutputStream
+{
+    private int bitsInChunk;
+    private OutputStream out;
+
+    private int currentByte;
+    private int positionInCurrentByte;
+
+    /**
+     * Constructor.
+     *
+     * @param os The output stream to write to.
+     */
+    public NBitOutputStream( OutputStream os )
+    {
+        out = os;
+        currentByte = 0;
+        positionInCurrentByte = 7;
+    }
+
+    /**
+     * This will write the next n-bits to the stream.
+     *
+     * @param chunk The next chunk of data to write.
+     *
+     * @throws IOException If there is an error writing the chunk.
+     */
+    public void write( long chunk ) throws IOException
+    {
+        long bitToWrite;
+        for( int i=(bitsInChunk-1); i>=0; i-- )
+        {
+            bitToWrite = (chunk >> i) & 0x1;
+            bitToWrite <<= positionInCurrentByte;
+            currentByte |= bitToWrite;
+            positionInCurrentByte--;
+            if( positionInCurrentByte < 0 )
+            {
+                out.write( currentByte );
+                currentByte = 0;
+                positionInCurrentByte = 7;
+            }
+        }
+    }
+
+    /**
+     * This will close the stream.
+     *
+     * @throws IOException if there is an error closing the stream.
+     */
+    public void close() throws IOException
+    {
+        if( positionInCurrentByte < 7 )
+        {
+            out.write( currentByte );
+        }
+    }
+
+    /** Getter for property bitsToRead.
+     * @return Value of property bitsToRead.
+     */
+    public int getBitsInChunk()
+    {
+        return bitsInChunk;
+    }
+
+    /** Setter for property bitsToRead.
+     * @param bitsInChunkValue New value of property bitsToRead.
+     */
+    public void setBitsInChunk(int bitsInChunkValue)
+    {
+        bitsInChunk = bitsInChunkValue;
+    }
+
+}
+\ No newline at end of file