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 }