Merged gcj-eclipse branch to trunk.

From-SVN: r120621

libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java

@@ -0,0 +1,118 @@
+/* ByteBufferOutputStream.java -- output stream with a growable underlying
+                                  byte buffer.
+   Copyright (C) 2006  Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.security.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import java.nio.ByteBuffer;
+
+/**
+ * An output stream that writes bytes to a ByteBuffer, which will be resized
+ * if more space is needed.
+ * 
+ * @author Casey Marshall (csm@gnu.org)
+ */
+public class ByteBufferOutputStream extends OutputStream
+{
+  private ByteBuffer buffer;
+  
+  public ByteBufferOutputStream()
+  {
+    this(256);
+  }
+  
+  public ByteBufferOutputStream(int initialCapacity)
+  {
+    buffer = ByteBuffer.allocate(initialCapacity);
+  }
+
+  /* (non-Javadoc)
+   * @see java.io.OutputStream#write(int)
+   */
+  public @Override synchronized void write(int b) throws IOException
+  {
+    if (!buffer.hasRemaining())
+      growBuffer();
+    buffer.put((byte) b); 
+  }
+  
+  public @Override synchronized void write(byte[] b, int offset, int length)
+  {
+    if (buffer.remaining() < length)
+      growBuffer();
+    buffer.put(b, offset, length);
+  }
+  
+  public @Override void write(byte[] b)
+  {
+    write(b, 0, b.length);
+  }
+
+  /**
+   * Get the current state of the buffer. The returned buffer will have
+   * its position set to zero, its capacity set to the current limit,
+   * and its limit set to its capacity.
+   * 
+   * @return The buffer.
+   */
+  public ByteBuffer buffer()
+  {
+    return ((ByteBuffer) buffer.duplicate().flip()).slice();
+  }
+  
+  public String toString()
+  {
+    return super.toString() + " [ buffer: " + buffer + " ]";
+  }
+  
+  private void growBuffer()
+  {
+    int newCapacity = buffer.capacity();
+    if (newCapacity < 16384) // If the buffer isn't huge yet, double its size
+      newCapacity = newCapacity << 1;
+    else // Otherwize, increment by a bit.
+      newCapacity += 4096;
+    ByteBuffer newBuffer = ByteBuffer.allocate(newCapacity);
+    buffer.flip();
+    newBuffer.put(buffer);
+    buffer = newBuffer;
+  }
+}