/*******************************************************************************
* Copyright (c) 2002, 2011 QNX Software Systems and others.
* 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:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.utils.macho;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
public class ERandomAccessFile extends RandomAccessFile {
private boolean isle;
private long ptr_offset;
int val[] = new int[4];
public ERandomAccessFile(String file, String mode) throws IOException {
super(file, mode);
}
public ERandomAccessFile(File file, String mode) throws IOException {
super(file, mode);
}
public void setEndian(boolean le)
{
isle = le;
}
public final short readShortE() throws IOException {
val[0] = read();
val[1] = read();
if ((val[0] | val[1]) < 0)
throw new EOFException();
if ( isle ) {
return (short)((val[1] << 8) + val[0]);
}
return (short)((val[0] << 8) + val[1]);
}
public final int readIntE() throws IOException
{
val[0] = read();
val[1] = read();
val[2] = read();
val[3] = read();
if ((val[0] | val[1] | val[2] | val[3]) < 0)
throw new EOFException();
if ( isle ) {
return ((val[3] << 24) + (val[2] << 16) + (val[1] << 8) + val[0]);
}
return ((val[0] << 24) + (val[1] << 16) + (val[2] << 8) + val[3]);
}
public final long readLongE() throws IOException
{
byte [] bytes = new byte[8];
long result = 0;
super.readFully(bytes);
int shift = 0;
if ( isle )
for(int i=7; i >= 0; i-- )
{
shift = i*8;
result += ( ((long)bytes[i]) << shift ) & ( 0xffL << shift );
}
else
for(int i=0; i <= 7; i++ )
{
shift = (7-i)*8;
result += ( ((long)bytes[i]) << shift ) & ( 0xffL << shift );
}
return result;
}
public void setFileOffset( long offset ) throws IOException {
ptr_offset = offset;
super.seek( offset );
}
@Override
public long getFilePointer() throws IOException {
long ptr = super.getFilePointer();
ptr = ptr - ptr_offset;
return ptr;
}
@Override
public void seek( long pos ) throws IOException {
long real_pos = pos + ptr_offset;
super.seek( real_pos );
}
}