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Apache Commons Compress software 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.compressors.deflate64;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.utils.InputStreamStatistics;

import static org.apache.commons.compress.utils.IOUtils.closeQuietly;

/**
 * Deflate64 decompressor.
 *
 * @since 1.16
 * @NotThreadSafe
 */
public class Deflate64CompressorInputStream extends CompressorInputStream implements InputStreamStatistics {
    private InputStream originalStream;
    private HuffmanDecoder decoder;
    private long compressedBytesRead;
    private final byte[] oneByte = new byte[1];

    /**
     * Constructs a Deflate64CompressorInputStream.
     *
     * @param in the stream to read from
     */
    public Deflate64CompressorInputStream(final InputStream in) {
        this(new HuffmanDecoder(in));
        originalStream = in;
    }

    Deflate64CompressorInputStream(final HuffmanDecoder decoder) {
        this.decoder = decoder;
    }

    /**
     * @throws java.io.EOFException if the underlying stream is exhausted before the end of deflated data was reached.
     */
    @Override
    public int read() throws IOException {
        while (true) {
            final int r = read(oneByte);
            switch (r) {
                case 1:
                    return oneByte[0] & 0xFF;
                case -1:
                    return -1;
                case 0:
                    continue;
                default:
                    throw new IllegalStateException("Invalid return value from read: " + r);
            }
        }
    }

    /**
     * @throws java.io.EOFException if the underlying stream is exhausted before the end of deflated data was reached.
     */
    @Override
    public int read(final byte[] b, final int off, final int len) throws IOException {
        if (len == 0) {
            return 0;
        }
        int read = -1;
        if (decoder != null) {
            try {
                read = decoder.decode(b, off, len);
            } catch (final RuntimeException ex) {
                throw new IOException("Invalid Deflate64 input", ex);
            }
            compressedBytesRead = decoder.getBytesRead();
            count(read);
            if (read == -1) {
                closeDecoder();
            }
        }
        return read;
    }

    @Override
    public int available() throws IOException {
        return decoder != null ? decoder.available() : 0;
    }

    @Override
    public void close() throws IOException {
        try {
            closeDecoder();
        } finally {
            if (originalStream != null) {
                originalStream.close();
                originalStream = null;
            }
        }
    }

    /**
     * @since 1.17
     */
    @Override
    public long getCompressedCount() {
        return compressedBytesRead;
    }

    private void closeDecoder() {
        closeQuietly(decoder);
        decoder = null;
    }
}