ojluni/src/main/java/com/sun/media/sound/ModelByteBuffer.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2007, 2013, 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) {
             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;
     }
 }
	/*
	* Copyright (c) 2007, 2013, 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) {
	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;
	}
	}