gprof/org.eclipse.linuxtools.gprof/src/org/eclipse/linuxtools/internal/gprof/utils/LEDataInputStream.java

/*******************************************************************************
 * Copyright (c) 2009 STMicroelectronics.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Xavier Raynaud <xavier.raynaud@st.com> - initial API and implementation
 *******************************************************************************/
package org.eclipse.linuxtools.internal.gprof.utils;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
/**
 * Little-endian implementation of DataInputStream
 * @author Xavier Raynaud <xavier.raynaud@st.com>
 *
 */
public class LEDataInputStream extends FilterInputStream implements DataInput {

	private final DataInputStream in;
	private final byte[] buffer = new byte[8];

	/**
	 * Constructor
	 * @param in
	 */
	public LEDataInputStream(DataInputStream in) {
		super(in);
		this.in = in;
	}

	@Override
	public final short readShort() throws IOException {
		in.readFully(buffer, 0, 2);
		return (short)(
				(buffer[1]&0xff) << 8 |
				(buffer[0]&0xff));
	}

	@Override
	public final int readUnsignedShort() throws IOException	{
		in.readFully(buffer, 0, 2);
		return (
				(buffer[1]&0xff) << 8 |
				(buffer[0]&0xff));
	}

	@Override
	public final char readChar() throws IOException	{
		in.readFully(buffer, 0, 2);
		return (char) (
				(buffer[1]&0xff) << 8 |
				(buffer[0]&0xff));
	}

	@Override
	public final int readInt() throws IOException {
		in.readFully(buffer, 0, 4);
		return
		(buffer[3])      << 24 |
		(buffer[2]&0xff) << 16 |
		(buffer[1]&0xff) <<  8 |
		(buffer[0]&0xff);
	}

	@Override
	public final long readLong() throws IOException	{
		in.readFully(buffer, 0, 8);
		return
		(long)(buffer[7])      << 56 |  /* long cast needed or shift done modulo 32 */
		(long)(buffer[6]&0xff) << 48 |
		(long)(buffer[5]&0xff) << 40 |
		(long)(buffer[4]&0xff) << 32 |
		(long)(buffer[3]&0xff) << 24 |
		(long)(buffer[2]&0xff) << 16 |
		(long)(buffer[1]&0xff) <<  8 |
		(long)(buffer[0]&0xff);
	}

	@Override
	public final float readFloat() throws IOException {
		return Float.intBitsToFloat(readInt());
	}

	@Override
	public final double readDouble() throws IOException	{
		return Double.longBitsToDouble(readLong());
	}

	@Override
	public boolean readBoolean() throws IOException {
		return in.readBoolean();
	}

	@Override
	public byte readByte() throws IOException {
		return in.readByte();
	}

	@Override
	public void readFully(byte[] b) throws IOException {
		in.readFully(b);
	}

	@Override
	public void readFully(byte[] b, int off, int len) throws IOException {
		in.readFully(b,off,len);
	}

    @Override
	@Deprecated
	public String readLine() throws IOException {
		return in.readLine();
	}

	@Override
	public String readUTF() throws IOException {
		return in.readUTF();
	}

	@Override
	public int readUnsignedByte() throws IOException {
		return in.readUnsignedByte();
	}

	@Override
	public int skipBytes(int n) throws IOException {
		return in.skipBytes(n);
	}

	/**
	 * Close this stream.
	 */
	@Override
	public void close() throws IOException {
		in.close();
	}
}