package org.hwo;

import static org.hwo.logging.Logging.log;
import static org.hwo.logging.LogLevel.*;

public class ByteArrayHexlifier {
	
	protected static char[] hexDigits = "0123456789ABCDEF".toCharArray();

	public static String hexlify(String source){
		String hex = byteArrayToString(source.getBytes());
		return hex;
	}

	public static String unhexlify(String source){
		String unhex = new String( stringToByteArray(source) );
		return unhex;
	}
	
	public static String byteArrayToString(byte[] bytes)
	{
		char[] target = new char[bytes.length * 2];
		
		for (int i=0;i<bytes.length;i++)
		{
			target[2*i+1] = hexDigits[bytes[i] & 0x0f];
			target[(2*i)] = hexDigits[(bytes[i]>>4) & 0x0f];			
		}
		
		return new String(target);
	}
	
	public static byte[] stringToByteArray(String hexstring)
	{
		byte[] buffer;
		int len = hexstring.length();
		
		if ((len % 2)!=0)
			len--;
		
		buffer = new byte[ len / 2]; 

		char[] source = hexstring.toCharArray();
		
		for (int i=0;i< buffer.length;i++)
		{
			if ((source[2*i] >= 'A')&&(source[2*i] <= 'F'))
			{
				buffer[i] = (byte)((source[2*i] - 'A' + 10)<<4); 
			} else if ((source[2*i] >= '0')&&(source[2*i] <= '9'))
			{
				buffer[i] = (byte)((source[2*i] - '0')<<4);
			}

			if ((source[(2*i)+1] >= 'A')&&(source[(2*i)+1] <= 'F'))
			{
				buffer[i] |= (byte)((source[(2*i)+1] - 'A' + 10)); 
			} else if ((source[(2*i)+1] >= '0')&&(source[(2*i)+1] <= '9'))
			{
				buffer[i] |= (byte)((source[(2*i)+1] - '0'));
			}
			
		}	
		return buffer;
	}
	
}