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//
// ========================================================================
// Copyright (c) 1995-2015 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.server.handler.gzip;
public final class Hex
{
private static final char[] hexcodes = "0123456789abcdef".toCharArray();
public static byte[] asByteArray(String id, int size)
{
if ((id.length() < 0) || (id.length() > (size * 2)))
{
throw new IllegalArgumentException(String.format("Invalid ID length of <%d> expected range of <0> to <%d>",id.length(),(size * 2)));
}
byte buf[] = new byte[size];
byte hex;
int len = id.length();
int idx = (int)Math.floor(((size * 2) - (double)len) / 2);
int i = 0;
if ((len % 2) != 0)
{ // deal with odd numbered chars
i -= 1;
}
for (; i < len; i++)
{
hex = 0;
if (i >= 0)
{
hex = (byte)(Character.digit(id.charAt(i),16) << 4);
}
i++;
hex += (byte)(Character.digit(id.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);
}
private Hex()
{
/* prevent instantiation */
}
}
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