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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.zip;

import de.schlichtherle.truezip.io.DecoratingInputStream;
import edu.umd.cs.findbugs.annotations.CreatesObligation;
import java.io.IOException;
import java.io.InputStream;
import javax.annotation.Nullable;
import javax.annotation.WillCloseWhenClosed;
import javax.annotation.concurrent.NotThreadSafe;

/**
 * A decorating input stream which counts the number of bytes read or skipped!
 *
 * @author Christian Schlichtherle
 */
@NotThreadSafe
final class CountingInputStream extends DecoratingInputStream {

    /** The number of bytes read. */
    private long bytesRead;

    /**
     * Constructs a new counting input stream.
     *
     * @param in the decorated input stream.
     */
    @CreatesObligation
    @edu.umd.cs.findbugs.annotations.SuppressWarnings("OBL_UNSATISFIED_OBLIGATION")
    CountingInputStream(@Nullable @WillCloseWhenClosed InputStream in) {
        super(in);
    }

    @Override
    public int read(final byte[] b, final int off, final int len)
    throws IOException {
        final int read = delegate.read(b, off, len);
        if (read > 0)
            this.bytesRead += read;
        return read;
    }

    @Override
    public int read() throws IOException {
        final int read = delegate.read();
        if (read != -1)
            this.bytesRead++;
        return read;
    }

    @Override
    public long skip(final long n) throws IOException {
        final long skipped = delegate.skip(n);
        this.bytesRead += skipped;
        return skipped;
    }

    public long getBytesRead() {
        return this.bytesRead;
    }
}