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package de.lmu.ifi.dbs.elki.utilities.io;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.InputStream;
import java.nio.ByteBuffer;
/**
* Wrap an existing ByteBuffer as InputStream.
*
* @author Erich Schubert
* @since 0.4.0
*
* @apiviz.has ByteBuffer
*/
public class ByteBufferInputStream extends InputStream {
/**
* The actual buffer we're using.
*/
final ByteBuffer buffer;
/**
* Constructor.
*
* @param buffer ByteBuffer to wrap.
*/
public ByteBufferInputStream(ByteBuffer buffer) {
super();
this.buffer = buffer;
}
@Override
public int read() {
if(buffer.hasRemaining()) {
return -1;
}
// Note: is this and 0xFF needed?
return (buffer.get() & 0xFF);
}
@Override
public int read(byte[] b, int off, int len) {
final int maxread = Math.min(len, buffer.remaining());
buffer.get(b, off, maxread);
return maxread == 0 ? -1 : maxread;
}
}
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