/*******************************************************************************
* 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.gcov.utils;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
/**
* Little-endian implementation of DataInputStream
* @author Xavier Raynaud <xavier.raynaud@st.com>
*/
public class LEDataInputStream implements DataInput {
private final DataInputStream in;
private final byte[] buffer = new byte[8];
/**
* Constructor
* @param in
*/
public LEDataInputStream(DataInputStream 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
| (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.
*/
public void close() throws IOException {
in.close();
}
public final long readUnsignedInt() throws IOException {
in.readFully(buffer, 0, 4);
return (((buffer[3]) << 24 | (buffer[2] & 0xff) << 16 | (buffer[1] & 0xff) << 8 | (buffer[0] & 0xff)) & MasksGenerator.UNSIGNED_INT_MASK);
}
}