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1   /*
2    * Copyright 2021 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  package io.netty.handler.codec.compression;
17  
18  import com.github.luben.zstd.Zstd;
19  
20  final class ZstdConstants {
21  
22      /**
23       * Default compression level
24       */
25      static final int DEFAULT_COMPRESSION_LEVEL = Zstd.defaultCompressionLevel();
26  
27      /**
28       * Min compression level
29       */
30      static final int MIN_COMPRESSION_LEVEL = Zstd.minCompressionLevel();
31  
32      /**
33       * Max compression level
34       */
35      static final int MAX_COMPRESSION_LEVEL = Zstd.maxCompressionLevel();
36  
37      /**
38       * Max block size
39       */
40      static final int MAX_BLOCK_SIZE = 1 << (DEFAULT_COMPRESSION_LEVEL + 7) + 0x0F;   //  32 M
41      /**
42       * Default block size
43       */
44      static final int DEFAULT_BLOCK_SIZE = 1 << 16;  // 64 KB
45  
46      private ZstdConstants() { }
47  }