org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/views/memory/HexRenderer.java

/*******************************************************************************
 * Copyright (c) 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.internal.ui.views.memory;

import java.math.BigInteger;
import org.eclipse.debug.internal.core.memory.MemoryByte;


/**
 * Converts bytes into raw hex data and vice versa.
 * 
 * @since 3.0
 */
public class HexRenderer extends AbstractMemoryRenderer implements IFixedLengthOutputRenderer {

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.memory.AbstractMemoryRenderer#getString(java.lang.String, java.math.BigInteger, org.eclipse.debug.internal.core.memory.MemoryByte[], java.lang.String)
	 */
	public String getString(
		String dataType,
		BigInteger address,
		MemoryByte[] data, String paddedStr) {

		StringBuffer strBuffer = new StringBuffer();
		
		for (int i=0; i<data.length; i++)
		{
			if ((data[i].flags & MemoryByte.VALID) != 0)
			{
				strBuffer.append(new String(convertByteToCharArray(data[i].value)));
			}
			else
			{
				// pad with padded string
				strBuffer.append(paddedStr);
			}
		}
		
		return strBuffer.toString().toUpperCase();

	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.memory.AbstractMemoryRenderer#getBytes(java.lang.String, java.math.BigInteger, org.eclipse.debug.internal.core.memory.MemoryByte[], java.lang.String)
	 */
	public byte[] getBytes(
		String dataType,
		BigInteger address,
		MemoryByte[] currentValues, String data) {

		byte[] bytes = convertHexStringToByteArray(data);
		
		return bytes;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.memory.IFixedLengthOutputRenderer#getNumCharPerByte()
	 */
	public int getNumCharPerByte() {
		return 2;
	}

	/**
	 * byte array to Hex string helper
	 * replaces the Integer.toHexString() which can't convert byte values properly
	 * (always pads with FFFFFF)
	 */
	static public String convertByteArrayToHexString(byte[] byteArray)
	{
		StringBuffer strBuffer = new StringBuffer();
		char charArray[];
		
		for (int i=0; i<byteArray.length;i ++)
		{
			charArray = convertByteToCharArray(byteArray[i]);
			strBuffer.append(charArray);			
		}
		
		return strBuffer.toString();
	}
	
	static private char[] convertByteToCharArray(byte aByte)
	{
		char charArray[] = new char[2];
		int val = aByte;
		if (val<0) val += 256;
		charArray[0] = Character.forDigit(val/16, 16);
		charArray[1] = Character.forDigit(val%16, 16);
		
		return charArray;
	}

	/**
	 * Convert raw memory datat to byte array
	 * @param str
	 * @return
	 * @throws NumberFormatException
	 */
	public byte[] convertHexStringToByteArray(String str) throws NumberFormatException
	{
		if (str.length() < getNumCharPerByte())
			return null;
		
		byte[] bytes = new byte[str.length()/getNumCharPerByte()];
	
		// set data in memory
		for (int i=0; i<bytes.length; i++)
		{
			// convert string to byte
			String oneByte = str.substring(i*2, i*2+2);
			
			Integer number = Integer.valueOf(oneByte, 16);
			if (number.compareTo(Integer.valueOf(Byte.toString(Byte.MAX_VALUE))) > 0)
			{
				int temp = number.intValue();
				temp = temp - 256;
	
				String tempStr = Integer.toString(temp);
		
				Byte myByte = Byte.valueOf(tempStr);
				bytes[i] = myByte.byteValue();
			}
			else
			{
				Byte myByte = Byte.valueOf(oneByte, 16);
				bytes[i] = myByte.byteValue();
			}
		}
		
		return bytes;
	}

}