| // |
| // ======================================================================== |
| // 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 */ |
| } |
| } |