CompressionContext.java

/*
 * 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;

import static org.waarp.compress.zstdsafe.Constants.*;

class CompressionContext {
  public final RepeatedOffsets offsets = new RepeatedOffsets();
  public final BlockCompressionState blockCompressionState;
  public final SequenceStore sequenceStore;

  public final SequenceEncodingContext sequenceEncodingContext =
      new SequenceEncodingContext();

  public final HuffmanCompressionContext huffmanContext =
      new HuffmanCompressionContext();

  public CompressionContext(final CompressionParameters parameters,
                            final int baseAddress, final int inputSize) {
    final int windowSize =
        Math.max(1, Math.min(1 << parameters.getWindowLog(), inputSize));
    final int blockSize = Math.min(MAX_BLOCK_SIZE, windowSize);
    final int divider = (parameters.getSearchLength() == 3)? 3 : 4;

    final int maxSequences = blockSize / divider;

    sequenceStore = new SequenceStore(blockSize, maxSequences);

    blockCompressionState = new BlockCompressionState(parameters, baseAddress);
  }

  public void commit() {
    offsets.commit();
    huffmanContext.saveChanges();
  }
}