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Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.commons.compress.archivers.sevenz;

import java.io.FilterInputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
import org.tukaani.xz.ARMOptions;
import org.tukaani.xz.ARMThumbOptions;
import org.tukaani.xz.FilterOptions;
import org.tukaani.xz.FinishableOutputStream;
import org.tukaani.xz.FinishableWrapperOutputStream;
import org.tukaani.xz.IA64Options;
import org.tukaani.xz.LZMAInputStream;
import org.tukaani.xz.PowerPCOptions;
import org.tukaani.xz.SPARCOptions;
import org.tukaani.xz.X86Options;

class Coders {
    private static final Map CODER_MAP = new HashMap() {

        private static final long serialVersionUID = 1664829131806520867L;
    {
            put(SevenZMethod.COPY, new CopyDecoder());
            put(SevenZMethod.LZMA, new LZMADecoder());
            put(SevenZMethod.LZMA2, new LZMA2Decoder());
            put(SevenZMethod.DEFLATE, new DeflateDecoder());
            put(SevenZMethod.BZIP2, new BZIP2Decoder());
            put(SevenZMethod.AES256SHA256, new AES256SHA256Decoder());
            put(SevenZMethod.BCJ_X86_FILTER, new BCJDecoder(new X86Options()));
            put(SevenZMethod.BCJ_PPC_FILTER, new BCJDecoder(new PowerPCOptions()));
            put(SevenZMethod.BCJ_IA64_FILTER, new BCJDecoder(new IA64Options()));
            put(SevenZMethod.BCJ_ARM_FILTER, new BCJDecoder(new ARMOptions()));
            put(SevenZMethod.BCJ_ARM_THUMB_FILTER, new BCJDecoder(new ARMThumbOptions()));
            put(SevenZMethod.BCJ_SPARC_FILTER, new BCJDecoder(new SPARCOptions()));
            put(SevenZMethod.DELTA_FILTER, new DeltaDecoder());
        }};

    static CoderBase findByMethod(SevenZMethod method) {
        return CODER_MAP.get(method);
    }

    static InputStream addDecoder(final InputStream is, long uncompressedLength,
            final Coder coder, final byte[] password) throws IOException {
        CoderBase cb = findByMethod(SevenZMethod.byId(coder.decompressionMethodId));
        if (cb == null) {
            throw new IOException("Unsupported compression method " +
                                  Arrays.toString(coder.decompressionMethodId));
        }
        return cb.decode(is, uncompressedLength, coder, password);
    }
    
    static OutputStream addEncoder(final OutputStream out, final SevenZMethod method,
                                   Object options) throws IOException {
        CoderBase cb = findByMethod(method);
        if (cb == null) {
            throw new IOException("Unsupported compression method " + method);
        }
        return cb.encode(out, options);
    }

    static class CopyDecoder extends CoderBase {
        @Override
        InputStream decode(final InputStream in, long uncompressedLength,
                final Coder coder, byte[] password) throws IOException {
            return in; 
        }
        @Override
        OutputStream encode(final OutputStream out, final Object options) {
            return out;
        }
    }

    static class LZMADecoder extends CoderBase {
        @Override
        InputStream decode(final InputStream in, long uncompressedLength,
                final Coder coder, byte[] password) throws IOException {
            byte propsByte = coder.properties[0];
            long dictSize = coder.properties[1];
            for (int i = 1; i < 4; i++) {
                dictSize |= (coder.properties[i + 1] & 0xffl) << (8 * i);
            }
            if (dictSize > LZMAInputStream.DICT_SIZE_MAX) {
                throw new IOException("Dictionary larger than 4GiB maximum size");
            }
            return new LZMAInputStream(in, uncompressedLength, propsByte, (int) dictSize);
        }
    }
    
    static class BCJDecoder extends CoderBase {
        private final FilterOptions opts;
        BCJDecoder(FilterOptions opts) {
            this.opts = opts;
        }

        @Override
        InputStream decode(final InputStream in, long uncompressedLength,
                final Coder coder, byte[] password) throws IOException {
            try {
                return opts.getInputStream(in);
            } catch (AssertionError e) {
                IOException ex = new IOException("BCJ filter needs XZ for Java > 1.4 - see "
                                                 + "http://commons.apache.org/proper/commons-compress/limitations.html#7Z");
                ex.initCause(e);
                throw ex;
            }
        }
        @Override
        OutputStream encode(final OutputStream out, final Object options) {
            final FinishableOutputStream fo = opts.getOutputStream(new FinishableWrapperOutputStream(out));
            return new FilterOutputStream(fo) {
                @Override
                public void flush() {
                }
            };
        }
    }
    
    static class DeflateDecoder extends CoderBase {
        DeflateDecoder() {
            super(Number.class);
        }

        @Override
        InputStream decode(final InputStream in, long uncompressedLength,
                final Coder coder, final byte[] password)
            throws IOException {
            return new InflaterInputStream(new DummyByteAddingInputStream(in),
                                           new Inflater(true));
        }
        @Override
        OutputStream encode(final OutputStream out, final Object options) {
            int level = numberOptionOrDefault(options, 9);
            return new DeflaterOutputStream(out, new Deflater(level, true));
        }
    }

    static class BZIP2Decoder extends CoderBase {
        BZIP2Decoder() {
            super(Number.class);
        }

        @Override
        InputStream decode(final InputStream in, long uncompressedLength,
                final Coder coder, final byte[] password)
                throws IOException {
            return new BZip2CompressorInputStream(in);
        }
        @Override
        OutputStream encode(final OutputStream out, final Object options)
                throws IOException {
            int blockSize = numberOptionOrDefault(options, BZip2CompressorOutputStream.MAX_BLOCKSIZE);
            return new BZip2CompressorOutputStream(out, blockSize);
        }
    }

    /**
     * ZLIB requires an extra dummy byte.
     *
     * @see java.util.zip.Inflater#Inflater(boolean)
     * @see org.apache.commons.compress.archivers.zip.ZipFile.BoundedInputStream
     */
    private static class DummyByteAddingInputStream extends FilterInputStream {
        private boolean addDummyByte = true;

        private DummyByteAddingInputStream(InputStream in) {
            super(in);
        }

        @Override
        public int read() throws IOException {
            int result = super.read();
            if (result == -1 && addDummyByte) {
                addDummyByte = false;
                result = 0;
            }
            return result;
        }

        @Override
        public int read(byte[] b, int off, int len) throws IOException {
            int result = super.read(b, off, len);
            if (result == -1 && addDummyByte) {
                addDummyByte = false;
                b[off] = 0;
                return 1;
            }
            return result;
        }
    }
}