1 /*
2 * This file is part of Waarp Project (named also Waarp or GG).
3 *
4 * Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
5 * tags. See the COPYRIGHT.txt in the distribution for a full listing of
6 * individual contributors.
7 *
8 * All Waarp Project is free software: you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or (at your
11 * option) any later version.
12 *
13 * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
14 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * Waarp . If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 /*
22 * Licensed under the Apache License, Version 2.0 (the "License");
23 * you may not use this file except in compliance with the License.
24 * You may obtain a copy of the License at
25 *
26 * http://www.apache.org/licenses/LICENSE-2.0
27 *
28 * Unless required by applicable law or agreed to in writing, software
29 * distributed under the License is distributed on an "AS IS" BASIS,
30 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
31 * See the License for the specific language governing permissions and
32 * limitations under the License.
33 */
34 package org.waarp.compress.zstdsafe;
35
36 import static org.waarp.compress.zstdsafe.Constants.*;
37
38 class CompressionContext {
39 public final RepeatedOffsets offsets = new RepeatedOffsets();
40 public final BlockCompressionState blockCompressionState;
41 public final SequenceStore sequenceStore;
42
43 public final SequenceEncodingContext sequenceEncodingContext =
44 new SequenceEncodingContext();
45
46 public final HuffmanCompressionContext huffmanContext =
47 new HuffmanCompressionContext();
48
49 public CompressionContext(final CompressionParameters parameters,
50 final int baseAddress, final int inputSize) {
51 final int windowSize =
52 Math.max(1, Math.min(1 << parameters.getWindowLog(), inputSize));
53 final int blockSize = Math.min(MAX_BLOCK_SIZE, windowSize);
54 final int divider = (parameters.getSearchLength() == 3)? 3 : 4;
55
56 final int maxSequences = blockSize / divider;
57
58 sequenceStore = new SequenceStore(blockSize, maxSequences);
59
60 blockCompressionState = new BlockCompressionState(parameters, baseAddress);
61 }
62
63 public void commit() {
64 offsets.commit();
65 huffmanContext.saveChanges();
66 }
67 }