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 }