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	/*
	* Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.media.sound;

	import java.io.ByteArrayInputStream;
	import java.io.DataInputStream;
	import java.io.File;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.io.RandomAccessFile;
	import java.util.Collection;

	/**
	* This class is a pointer to a binary array either in memory or on disk.
	*
	* @author Karl Helgason
	*/
	public final class ModelByteBuffer {

	private ModelByteBuffer root = this;
	private File file;
	private long fileoffset;
	private byte[] buffer;
	private long offset;
	private final long len;

	private class RandomFileInputStream extends InputStream {

	private final RandomAccessFile raf;
	private long left;
	private long mark = 0;
	private long markleft = 0;

	RandomFileInputStream() throws IOException {
	raf = new RandomAccessFile(root.file, "r");
	raf.seek(root.fileoffset + arrayOffset());
	left = capacity();
	}

	public int available() throws IOException {
	if (left > Integer.MAX_VALUE)
	return Integer.MAX_VALUE;
	return (int)left;
	}

	public synchronized void mark(int readlimit) {
	try {
	mark = raf.getFilePointer();
	markleft = left;
	} catch (IOException e) {
	//e.printStackTrace();
	}
	}

	public boolean markSupported() {
	return true;
	}

	public synchronized void reset() throws IOException {
	raf.seek(mark);
	left = markleft;
	}

	public long skip(long n) throws IOException {
	if( n < 0)
	return 0;
	if (n > left)
	n = left;
	long p = raf.getFilePointer();
	raf.seek(p + n);
	left -= n;
	return n;
	}

	public int read(byte b[], int off, int len) throws IOException {
	if (len > left)
	len = (int)left;
	if (left == 0)
	return -1;
	len = raf.read(b, off, len);
	if (len == -1)
	return -1;
	left -= len;
	return len;
	}

	public int read(byte[] b) throws IOException {
	int len = b.length;
	if (len > left)
	len = (int)left;
	if (left == 0)
	return -1;
	len = raf.read(b, 0, len);
	if (len == -1)
	return -1;
	left -= len;
	return len;
	}

	public int read() throws IOException {
	if (left == 0)
	return -1;
	int b = raf.read();
	if (b == -1)
	return -1;
	left--;
	return b;
	}

	public void close() throws IOException {
	raf.close();
	}
	}

	private ModelByteBuffer(ModelByteBuffer parent,
	long beginIndex, long endIndex, boolean independent) {
	this.root = parent.root;
	this.offset = 0;
	long parent_len = parent.len;
	if (beginIndex < 0)
	beginIndex = 0;
	if (beginIndex > parent_len)
	beginIndex = parent_len;
	if (endIndex < 0)
	endIndex = 0;
	if (endIndex > parent_len)
	endIndex = parent_len;
	if (beginIndex > endIndex)
	beginIndex = endIndex;
	offset = beginIndex;
	len = endIndex - beginIndex;
	if (independent) {
	buffer = root.buffer;
	if (root.file != null) {
	file = root.file;
	fileoffset = root.fileoffset + arrayOffset();
	offset = 0;
	} else
	offset = arrayOffset();
	root = this;
	}
	}

	public ModelByteBuffer(byte[] buffer) {
	this.buffer = buffer;
	this.offset = 0;
	this.len = buffer.length;
	}

	public ModelByteBuffer(byte[] buffer, int offset, int len) {
	this.buffer = buffer;
	this.offset = offset;
	this.len = len;
	}

	public ModelByteBuffer(File file) {
	this.file = file;
	this.fileoffset = 0;
	this.len = file.length();
	}

	public ModelByteBuffer(File file, long offset, long len) {
	this.file = file;
	this.fileoffset = offset;
	this.len = len;
	}

	public void writeTo(OutputStream out) throws IOException {
	if (root.file != null && root.buffer == null) {
	try (InputStream is = getInputStream()) {
	byte[] buff = new byte[1024];
	int ret;
	while ((ret = is.read(buff)) != -1) {
	out.write(buff, 0, ret);
	}
	}
	} else
	out.write(array(), (int) arrayOffset(), (int) capacity());
	}

	public InputStream getInputStream() {
	if (root.file != null && root.buffer == null) {
	try {
	return new RandomFileInputStream();
	} catch (IOException e) {
	//e.printStackTrace();
	return null;
	}
	}
	return new ByteArrayInputStream(array(),
	(int)arrayOffset(), (int)capacity());
	}

	public ModelByteBuffer subbuffer(long beginIndex) {
	return subbuffer(beginIndex, capacity());
	}

	public ModelByteBuffer subbuffer(long beginIndex, long endIndex) {
	return subbuffer(beginIndex, endIndex, false);
	}

	public ModelByteBuffer subbuffer(long beginIndex, long endIndex,
	boolean independent) {
	return new ModelByteBuffer(this, beginIndex, endIndex, independent);
	}

	public byte[] array() {
	return root.buffer;
	}

	public long arrayOffset() {
	if (root != this)
	return root.arrayOffset() + offset;
	return offset;
	}

	public long capacity() {
	return len;
	}

	public ModelByteBuffer getRoot() {
	return root;
	}

	public File getFile() {
	return file;
	}

	public long getFilePointer() {
	return fileoffset;
	}

	public static void loadAll(Collection<ModelByteBuffer> col)
	throws IOException {
	File selfile = null;
	RandomAccessFile raf = null;
	try {
	for (ModelByteBuffer mbuff : col) {
	mbuff = mbuff.root;
	if (mbuff.file == null)
	continue;
	if (mbuff.buffer != null)
	continue;
	if (selfile == null \|\| !selfile.equals(mbuff.file)) {
	if (raf != null) {
	raf.close();
	raf = null;
	}
	selfile = mbuff.file;
	raf = new RandomAccessFile(mbuff.file, "r");
	}
	raf.seek(mbuff.fileoffset);
	byte[] buffer = new byte[(int) mbuff.capacity()];

	int read = 0;
	int avail = buffer.length;
	while (read != avail) {
	if (avail - read > 65536) {
	raf.readFully(buffer, read, 65536);
	read += 65536;
	} else {
	raf.readFully(buffer, read, avail - read);
	read = avail;
	}

	}

	mbuff.buffer = buffer;
	mbuff.offset = 0;
	}
	} finally {
	if (raf != null)
	raf.close();
	}
	}

	public void load() throws IOException {
	if (root != this) {
	root.load();
	return;
	}
	if (buffer != null)
	return;
	if (file == null) {
	throw new IllegalStateException(
	"No file associated with this ByteBuffer!");
	}

	DataInputStream is = new DataInputStream(getInputStream());
	buffer = new byte[(int) capacity()];
	offset = 0;
	is.readFully(buffer);
	is.close();

	}

	public void unload() {
	if (root != this) {
	root.unload();
	return;
	}
	if (file == null) {
	throw new IllegalStateException(
	"No file associated with this ByteBuffer!");
	}
	root.buffer = null;
	}
	}

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