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//========================================================================
//Copyright 2011-2012 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//All rights reserved. This program and the accompanying materials
//are made available under the terms of the Eclipse Public License v1.0
//and Apache License v2.0 which accompanies this distribution.
//The Eclipse Public License is available at
//http://www.eclipse.org/legal/epl-v10.html
//The Apache License v2.0 is available at
//http://www.opensource.org/licenses/apache2.0.php
//You may elect to redistribute this code under either of these licenses.
//========================================================================
package org.eclipse.jetty.websocket.server.helper;
public final class Hex
{
private static final char[] hexcodes = "0123456789ABCDEF".toCharArray();
public static byte[] asByteArray(String hstr)
{
if ((hstr.length() < 0) || ((hstr.length() % 2) != 0))
{
throw new IllegalArgumentException(String.format("Invalid string length of <%d>",hstr.length()));
}
int size = hstr.length() / 2;
byte buf[] = new byte[size];
byte hex;
int len = hstr.length();
int idx = (int)Math.floor(((size * 2) - (double)len) / 2);
for (int i = 0; i < len; i++)
{
hex = 0;
if (i >= 0)
{
hex = (byte)(Character.digit(hstr.charAt(i),16) << 4);
}
i++;
hex += (byte)(Character.digit(hstr.charAt(i),16));
buf[idx] = hex;
idx++;
}
return buf;
}
public static String asHex(byte buf[])
{
int len = buf.length;
char out[] = new char[len * 2];
for (int i = 0; i < len; i++)
{
out[i * 2] = hexcodes[(buf[i] & 0xF0) >> 4];
out[(i * 2) + 1] = hexcodes[(buf[i] & 0x0F)];
}
return String.valueOf(out);
}
}
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