mirror of git://gcc.gnu.org/git/gcc.git
119 lines
3.6 KiB
Java
119 lines
3.6 KiB
Java
/* 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;
|
|
}
|
|
}
|