1 /*
   2  * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.incubator.http.internal.hpack;
  24 
  25 import java.nio.ByteBuffer;
  26 import java.util.ArrayList;
  27 import java.util.List;
  28 import java.util.regex.Matcher;
  29 import java.util.regex.Pattern;
  30 import java.util.stream.Collectors;
  31 
  32 //
  33 // THIS IS NOT A TEST
  34 //
  35 public final class SpecHelper {
  36 
  37     private SpecHelper() {
  38         throw new AssertionError();
  39     }
  40 
  41     public static ByteBuffer toBytes(String hexdump) {
  42         Pattern hexByte = Pattern.compile("[0-9a-fA-F]{2}");
  43         List<String> bytes = new ArrayList<>();
  44         Matcher matcher = hexByte.matcher(hexdump);
  45         while (matcher.find()) {
  46             bytes.add(matcher.group(0));
  47         }
  48         ByteBuffer result = ByteBuffer.allocate(bytes.size());
  49         for (String f : bytes) {
  50             result.put((byte) Integer.parseInt(f, 16));
  51         }
  52         result.flip();
  53         return result;
  54     }
  55 
  56     public static String toHexdump(ByteBuffer bb) {
  57         List<String> words = new ArrayList<>();
  58         int i = 0;
  59         while (bb.hasRemaining()) {
  60             if (i % 2 == 0) {
  61                 words.add("");
  62             }
  63             byte b = bb.get();
  64             String hex = Integer.toHexString(256 + Byte.toUnsignedInt(b)).substring(1);
  65             words.set(i / 2, words.get(i / 2) + hex);
  66             i++;
  67         }
  68         return words.stream().collect(Collectors.joining(" "));
  69     }
  70 }