/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.jogamp.opengl.util.texture.spi;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.EOFException;
import java.io.IOException;
/**
* Little Endian Data Input Stream.
*
* This class implements an input stream filter to allow reading
* of java native datatypes from an input stream which has those
* native datatypes stored in a little endian byte order.<p>
*
* This is the sister class of the DataInputStream which allows
* for reading of java native datatypes from an input stream with
* the datatypes stored in big endian byte order.<p>
*
* This class implements the minimum required and calls DataInputStream
* for some of the required methods for DataInput.<p>
*
* Not all methods are implemented due to lack of immediatte requirement
* for that functionality. It is not clear if it is ever going to be
* functionally required to be able to read UTF data in a LittleEndianManner<p>
*
* @author Robin Luiten
* @version 1.1 15/Dec/1997
*/
public class LEDataInputStream extends FilterInputStream implements DataInput
{
/**
* To reuse some of the non endian dependent methods from
* DataInputStreams methods.
*/
DataInputStream dataIn;
public LEDataInputStream(final InputStream in)
{
super(in);
dataIn = new DataInputStream(in);
}
@Override
public void close() throws IOException
{
dataIn.close(); // better close as we create it.
// this will close underlying as well.
}
@Override
public synchronized final int read(final byte b[]) throws IOException
{
return dataIn.read(b, 0, b.length);
}
@Override
public synchronized final int read(final byte b[], final int off, final int len) throws IOException
{
final int rl = dataIn.read(b, off, len);
return rl;
}
@Override
public final void readFully(final byte b[]) throws IOException
{
dataIn.readFully(b, 0, b.length);
}
@Override
public final void readFully(final byte b[], final int off, final int len) throws IOException
{
dataIn.readFully(b, off, len);
}
@Override
public final int skipBytes(final int n) throws IOException
{
return dataIn.skipBytes(n);
}
@Override
public final boolean readBoolean() throws IOException
{
final int ch = dataIn.read();
if (ch < 0)
throw new EOFException();
return (ch != 0);
}
@Override
public final byte readByte() throws IOException
{
final int ch = dataIn.read();
if (ch < 0)
throw new EOFException();
return (byte)(ch);
}
@Override
public final int readUnsignedByte() throws IOException
{
final int ch = dataIn.read();
if (ch < 0)
throw new EOFException();
return ch;
}
@Override
public final short readShort() throws IOException
{
final int ch1 = dataIn.read();
final int ch2 = dataIn.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (short)((ch1 << 0) + (ch2 << 8));
}
@Override
public final int readUnsignedShort() throws IOException
{
final int ch1 = dataIn.read();
final int ch2 = dataIn.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (ch1 << 0) + (ch2 << 8);
}
@Override
public final char readChar() throws IOException
{
final int ch1 = dataIn.read();
final int ch2 = dataIn.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (char)((ch1 << 0) + (ch2 << 8));
}
@Override
public final int readInt() throws IOException
{
final int ch1 = dataIn.read();
final int ch2 = dataIn.read();
final int ch3 = dataIn.read();
final int ch4 = dataIn.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EOFException();
return ((ch1 << 0) + (ch2 << 8) + (ch3 << 16) + (ch4 << 24));
}
@Override
public final long readLong() throws IOException
{
final int i1 = readInt();
final int i2 = readInt();
return (i1 & 0xFFFFFFFFL) + ((long)i2 << 32);
}
@Override
public final float readFloat() throws IOException
{
return Float.intBitsToFloat(readInt());
}
@Override
public final double readDouble() throws IOException
{
return Double.longBitsToDouble(readLong());
}
/**
* dont call this it is not implemented.
* @return empty new string
**/
@Override
public final String readLine() throws IOException
{
return "";
}
/**
* dont call this it is not implemented
* @return empty new string
**/
@Override
public final String readUTF() throws IOException
{
return "";
}
/**
* dont call this it is not implemented
* @return empty new string
**/
public final static String readUTF(final DataInput in) throws IOException
{
return "";
}
}