Constants

/*
 * This file is part of Waarp Project (named also Waarp or GG).
 *
 *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
 *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
 * individual contributors.
 *
 *  All Waarp Project is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 * Waarp . If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.waarp.compress.zstdsafe;

class Constants {
  public static final int SIZE_OF_BYTE = 1;
  public static final int SIZE_OF_SHORT = 2;
  public static final int SIZE_OF_INT = 4;
  public static final int SIZE_OF_LONG = 8;

  public static final int MAGIC_NUMBER = 0xFD2FB528;

  public static final int MIN_WINDOW_LOG = 10;
  public static final int MAX_WINDOW_LOG = 31;

  public static final int SIZE_OF_BLOCK_HEADER = 3;

  public static final int MIN_SEQUENCES_SIZE = 1;
  public static final int MIN_BLOCK_SIZE = 1 // block type tag
                                           + 1
                                           // min size of raw or rle length header
                                           + MIN_SEQUENCES_SIZE;
  public static final int MAX_BLOCK_SIZE = 128 * 1024;

  public static final int REPEATED_OFFSET_COUNT = 3;

  // block types
  public static final int RAW_BLOCK = 0;
  public static final int RLE_BLOCK = 1;
  public static final int COMPRESSED_BLOCK = 2;

  // sequence encoding types
  public static final int SEQUENCE_ENCODING_BASIC = 0;
  public static final int SEQUENCE_ENCODING_RLE = 1;
  public static final int SEQUENCE_ENCODING_COMPRESSED = 2;
  public static final int SEQUENCE_ENCODING_REPEAT = 3;

  public static final int MAX_LITERALS_LENGTH_SYMBOL = 35;
  public static final int MAX_MATCH_LENGTH_SYMBOL = 52;
  public static final int MAX_OFFSET_CODE_SYMBOL = 31;
  public static final int DEFAULT_MAX_OFFSET_CODE_SYMBOL = 28;

  public static final int LITERAL_LENGTH_TABLE_LOG = 9;
  public static final int MATCH_LENGTH_TABLE_LOG = 9;
  public static final int OFFSET_TABLE_LOG = 8;

  // literal block types
  public static final int RAW_LITERALS_BLOCK = 0;
  public static final int RLE_LITERALS_BLOCK = 1;
  public static final int COMPRESSED_LITERALS_BLOCK = 2;
  public static final int TREELESS_LITERALS_BLOCK = 3;

  public static final int LONG_NUMBER_OF_SEQUENCES = 0x7F00;

  protected static final int[] LITERALS_LENGTH_BITS = {
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4,
      6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
  };

  protected static final int[] MATCH_LENGTH_BITS = {
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9, 10, 11, 12,
      13, 14, 15, 16
  };

  private Constants() {
  }
}