/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.revolsys.geometry.wkb;
/**
* Allows an array of bytes to be used as an {@link InStream}.
* To optimize memory usage, instances can be reused
* with different byte arrays.
*/
public class ByteArrayInStream implements InStream {
/*
* Implementation improvement suggested by Andrea Aime - Dec 15 2007
*/
private byte[] buffer;
private int position;
/**
* Creates a new stream based on the given buffer.
*
* @param buffer the bytes to read
*/
public ByteArrayInStream(final byte[] buffer) {
setBytes(buffer);
}
/**
* Reads up to <tt>buf.length</tt> bytes from the stream
* into the given byte buffer.
*
* @param buf the buffer to place the read bytes into
*/
@Override
public void read(final byte[] buf) {
int numToRead = buf.length;
// don't try and copy past the end of the input
if (this.position + numToRead > this.buffer.length) {
numToRead = this.buffer.length - this.position;
System.arraycopy(this.buffer, this.position, buf, 0, numToRead);
// zero out the unread bytes
for (int i = numToRead; i < buf.length; i++) {
buf[i] = 0;
}
} else {
System.arraycopy(this.buffer, this.position, buf, 0, numToRead);
}
this.position += numToRead;
}
/**
* Sets this stream to read from the given buffer
*
* @param buffer the bytes to read
*/
public void setBytes(final byte[] buffer) {
this.buffer = buffer;
this.position = 0;
}
}