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/*******************************************************************************
* Copyright (c) 2011, 2013 Ericsson, Ecole Polytechnique de Montreal 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: Matthew Khouzam - Initial API and implementation
* Contributors: Simon Marchi - Initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.ctf.core.event.types;
import java.math.BigInteger;
import java.nio.ByteOrder;
import org.eclipse.linuxtools.ctf.core.event.io.BitBuffer;
/**
* A CTF integer definition.
*
* The definition of a integer basic data type. It will take the data from a
* trace and store it (and make it fit) as a long.
*
* @version 1.0
* @author Matthew Khouzam
* @author Simon Marchi
*/
public class IntegerDefinition extends SimpleDatatypeDefinition {
// ------------------------------------------------------------------------
// Attributes
// ------------------------------------------------------------------------
private final IntegerDeclaration declaration;
private long value;
// ------------------------------------------------------------------------
// Contructors
// ------------------------------------------------------------------------
/**
* Constructor
*
* @param declaration
* the parent declaration
* @param definitionScope
* the parent scope
* @param fieldName
* the field name
*/
public IntegerDefinition(IntegerDeclaration declaration,
IDefinitionScope definitionScope, String fieldName) {
super(definitionScope, fieldName);
this.declaration = declaration;
}
// ------------------------------------------------------------------------
// Gettters/Setters/Predicates
// ------------------------------------------------------------------------
/**
* Gets the value of the integer
*
* @return the value of the integer (in long)
*/
public long getValue() {
return value;
}
/**
* Sets the value of an integer
*
* @param val
* the value
*/
public void setValue(long val) {
value = val;
}
@Override
public IntegerDeclaration getDeclaration() {
return declaration;
}
// ------------------------------------------------------------------------
// Operations
// ------------------------------------------------------------------------
@Override
public Long getIntegerValue() {
return getValue();
}
@Override
public String getStringValue() {
return this.toString();
}
@Override
public void read(BitBuffer input) {
final long longNegBit = 0x0000000080000000L;
int align = (int) declaration.getAlignment();
long pos = input.position() + ((align - (input.position() % align)) % align);
input.position(pos);
boolean signed = declaration.isSigned();
int length = declaration.getLength();
long bits = 0;
/*
* Is the endianness of this field the same as the endianness of the
* input buffer? If not, then temporarily set the buffer's endianness to
* this field's just to read the data
*/
ByteOrder byteOrder = input.getByteOrder();
if ((this.declaration.getByteOrder() != null) &&
(this.declaration.getByteOrder() != input.getByteOrder())) {
input.setByteOrder(this.declaration.getByteOrder());
}
// TODO: use the eventual getLong from BitBuffer
if (length == 64) {
long low = input.getInt(32, false);
low = low & 0x00000000FFFFFFFFL;
long high = input.getInt(32, false);
high = high & 0x00000000FFFFFFFFL;
if (this.declaration.getByteOrder() != ByteOrder.BIG_ENDIAN) {
bits = (high << 32) | low;
} else {
bits = (low << 32) | high;
}
} else {
bits = input.getInt(length, signed);
bits = bits & 0x00000000FFFFFFFFL;
/*
* The previous line loses sign information but is necessary, this
* fixes the sign for 32 bit numbers. Sorry, in java all 64 bit ints
* are signed.
*/
if ((longNegBit == (bits & longNegBit)) && signed) {
bits |= 0xffffffff00000000L;
}
}
/*
* Put the input buffer's endianness back to original if it was changed
*/
if (byteOrder != input.getByteOrder()) {
input.setByteOrder(byteOrder);
}
value = bits;
}
@Override
public String toString() {
if (declaration.isCharacter()) {
char c = (char) value;
return Character.toString(c);
}
return formatNumber(value, declaration.getBase(), declaration.isSigned());
}
/**
* Print a numeric value as a string in a given base
*
* @param value
* The value to print as string
* @param base
* The base for this value
* @param signed
* Is the value signed or not
* @return formatted number string
* @since 3.0
*/
public static final String formatNumber(long value, int base, boolean signed) {
String s;
/* Format the number correctly according to the integer's base */
switch (base) {
case 2:
s = "0b" + Long.toBinaryString(value); //$NON-NLS-1$
break;
case 8:
s = "0" + Long.toOctalString(value); //$NON-NLS-1$
break;
case 16:
s = "0x" + Long.toHexString(value); //$NON-NLS-1$
break;
case 10:
default:
/* For non-standard base, we'll just print it as a decimal number */
if (!signed && value < 0) {
/*
* Since there are no 'unsigned long', handle this case with
* BigInteger
*/
BigInteger bigInteger = BigInteger.valueOf(value);
/*
* we add 2^64 to the negative number to get the real unsigned
* value
*/
bigInteger = bigInteger.add(BigInteger.valueOf(1).shiftLeft(64));
s = bigInteger.toString();
} else {
s = Long.toString(value);
}
break;
}
return s;
}
}
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