/*
 * 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
 *
 *   https://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.zip;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

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

/**
 * Helper class to provide statistics
 *
 * @since 1.17
 */
class InflaterInputStreamWithStatistics extends InflaterInputStream implements InputStreamStatistics {

    private long compressedCount;
    private long uncompressedCount;

    InflaterInputStreamWithStatistics(final InputStream in) {
        super(in);
    }

    InflaterInputStreamWithStatistics(final InputStream in, final Inflater inf) {
        super(in, inf);
    }

    InflaterInputStreamWithStatistics(final InputStream in, final Inflater inf, final int size) {
        super(in, inf, size);
    }

    @Override
    protected void fill() throws IOException {
        super.fill();
        compressedCount += inf.getRemaining();
    }

    @Override
    public long getCompressedCount() {
        return compressedCount;
    }

    @Override
    public long getUncompressedCount() {
        return uncompressedCount;
    }

    @Override
    public int read() throws IOException {
        final int b = super.read();
        if (b > -1) {
            uncompressedCount++;
        }
        return b;
    }

    @Override
    public int read(final byte[] b, final int off, final int len) throws IOException {
        final int bytes = super.read(b, off, len);
        if (bytes > -1) {
            uncompressedCount += bytes;
        }
        return bytes;
    }
}
