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1   /*
2    * Copyright 2015 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  /*
18   * Copyright 2015 Twitter, Inc.
19   *
20   * Licensed under the Apache License, Version 2.0 (the "License");
21   * you may not use this file except in compliance with the License.
22   * You may obtain a copy of the License at
23   *
24   *     https://www.apache.org/licenses/LICENSE-2.0
25   *
26   * Unless required by applicable law or agreed to in writing, software
27   * distributed under the License is distributed on an "AS IS" BASIS,
28   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
29   * See the License for the specific language governing permissions and
30   * limitations under the License.
31   */
32  package io.netty5.handler.codec.http2;
33  
34  import io.netty5.util.AsciiString;
35  import io.netty5.util.internal.UnstableApi;
36  
37  import java.util.ArrayList;
38  import java.util.List;
39  import java.util.Random;
40  
41  /**
42   * Helper class representing a single header entry. Used by the benchmarks.
43   */
44  @UnstableApi
45  public final class HpackHeader {
46      private static final String ALPHABET =
47              "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
48  
49      final CharSequence name;
50      final CharSequence value;
51  
52      private HpackHeader(byte[] name, byte[] value) {
53          this.name = new AsciiString(name, false);
54          this.value = new AsciiString(value, false);
55      }
56  
57      /**
58       * Creates a number of random headers with the given name/value lengths.
59       */
60      static List<HpackHeader> createHeaders(int numHeaders, int nameLength, int valueLength,
61                                             boolean limitToAscii) {
62          List<HpackHeader> hpackHeaders = new ArrayList<>(numHeaders);
63          for (int i = 0; i < numHeaders; ++i) {
64              // Force always ascii for header names
65              byte[] name = randomBytes(new byte[nameLength], true);
66              byte[] value = randomBytes(new byte[valueLength], limitToAscii);
67              hpackHeaders.add(new HpackHeader(name, value));
68          }
69          return hpackHeaders;
70      }
71  
72      private static byte[] randomBytes(byte[] bytes, boolean limitToAscii) {
73          Random r = new Random();
74          if (limitToAscii) {
75              for (int index = 0; index < bytes.length; ++index) {
76                  int charIndex = r.nextInt(ALPHABET.length());
77                  bytes[index] = (byte) ALPHABET.charAt(charIndex);
78              }
79          } else {
80              r.nextBytes(bytes);
81          }
82          return bytes;
83      }
84  }