httpcore5/src/main/java/org/apache/hc/core5/http/impl/io/EmptyInputStream.java [37:119]:
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public final class EmptyInputStream extends InputStream {

    public static final EmptyInputStream INSTANCE = new EmptyInputStream();

    private EmptyInputStream() {
        // noop.
    }

    /**
     * Returns {@code 0}.
     */
    @Override
    public int available() {
        return 0;
    }

    /**
     * Noop.
     */
    @Override
    public void close() {
        // noop.
    }

    /**
     * Noop.
     */
    @SuppressWarnings("sync-override")
    @Override
    public void mark(final int readLimit) {
        // noop.
    }

    /**
     * Returns {@code true}.
     */
    @Override
    public boolean markSupported() {
        return true;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read() {
        return -1;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read(final byte[] buf) {
        return -1;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read(final byte[] buf, final int off, final int len) {
        if (len == 0) {
            return 0;
        }
        return -1;
    }

    /**
     * Noop.
     */
    @SuppressWarnings("sync-override")
    @Override
    public void reset() {
        // noop
    }

    /**
     * Returns {@code 0}.
     */
    @Override
    public long skip(final long n) {
        return 0L;
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httpcore5/src/main/java/org/apache/hc/core5/http/io/entity/EmptyInputStream.java [35:120]:
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public final class EmptyInputStream extends InputStream {

    /**
     * Singleton instance of EmptyInputStream.
     */
    public static final EmptyInputStream INSTANCE = new EmptyInputStream();

    private EmptyInputStream() {
        // noop.
    }

    /**
     * Returns {@code 0}.
     */
    @Override
    public int available() {
        return 0;
    }

    /**
     * Noop.
     */
    @Override
    public void close() {
        // noop.
    }

    /**
     * Noop.
     */
    @SuppressWarnings("sync-override")
    @Override
    public void mark(final int readLimit) {
        // noop.
    }

    /**
     * Returns {@code true}.
     */
    @Override
    public boolean markSupported() {
        return true;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read() {
        return -1;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read(final byte[] buf) {
        return -1;
    }

    /**
     * Returns {@code -1}.
     */
    @Override
    public int read(final byte[] buf, final int off, final int len) {
        if (len == 0) {
            return 0;
        }
        return -1;
    }

    /**
     * Noop.
     */
    @SuppressWarnings("sync-override")
    @Override
    public void reset() {
        // noop
    }

    /**
     * Returns {@code 0}.
     */
    @Override
    public long skip(final long n) {
        return 0L;
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