org.eclipse.jetty.toolchain.test.Hex Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jetty-test-helper Show documentation

Unit Testing Support for Jetty (common classes for some unit tests)

There is a newer version: 6.3

//
//  ========================================================================
//  Copyright (c) 1995-2018 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.toolchain.test;

import java.nio.ByteBuffer;

public final class Hex
{
    private static final char[] hexcodes = "0123456789ABCDEF".toCharArray();
    
    public static byte[] asByteArray(String hexString)
    {
        if ((hexString.length() < 0) || ((hexString.length() % 2) != 0))
        {
            throw new IllegalArgumentException(String.format("Invalid string length of <%d>", hexString.length()));
        }
        
        int size = hexString.length() / 2;
        byte buf[] = new byte[size];
        byte hex;
        int len = hexString.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(hexString.charAt(i), 16) << 4);
            }
            i++;
            hex += (byte) (Character.digit(hexString.charAt(i), 16));
            
            buf[idx] = hex;
            idx++;
        }
        
        return buf;
    }
    
    public static ByteBuffer asByteBuffer(String hexString)
    {
        return ByteBuffer.wrap(asByteArray(hexString));
    }
    
    public static String asHex(byte buffer[])
    {
        int len = buffer.length;
        char out[] = new char[len * 2];
        for (int i = 0; i < len; i++)
        {
            out[i * 2] = hexcodes[(buffer[i] & 0xF0) >> 4];
            out[(i * 2) + 1] = hexcodes[(buffer[i] & 0x0F)];
        }
        return String.valueOf(out);
    }
    
    public static String asHex(ByteBuffer buffer)
    {
        return asHex(ByteBufferUtils.toArray(buffer));
    }
}