src/main/java/org/apache/commons/io/input/NullInputStream.java [303:342]:
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        return returnLength;
    }

    /**
     * Reset the stream to the point when mark was last called.
     *
     * @throws UnsupportedOperationException if mark is not supported.
     * @throws IOException If no position has been marked
     * or the read limit has been exceeded since the last position was
     * marked.
     */
    @Override
    public synchronized void reset() throws IOException {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.reset();
        }
        if (mark < 0) {
            throw new IOException("No position has been marked");
        }
        if (position > mark + readlimit) {
            throw new IOException("Marked position [" + mark +
                    "] is no longer valid - passed the read limit [" +
                    readlimit + "]");
        }
        position = mark;
        eof = false;
    }

    /**
     * Skip a specified number of bytes.
     *
     * @param numberOfBytes The number of bytes to skip.
     * @return The number of bytes skipped or {@code -1}
     * if the end of file has been reached and
     * {@code throwEofException} is set to {@code false}.
     * @throws EOFException if the end of file is reached and
     * {@code throwEofException} is set to {@code true}.
     * @throws IOException if trying to read past the end of file.
     */
    @Override
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src/main/java/org/apache/commons/io/input/NullReader.java [288:327]:
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        return returnLength;
    }

    /**
     * Resets the stream to the point when mark was last called.
     *
     * @throws UnsupportedOperationException if mark is not supported.
     * @throws IOException If no position has been marked
     * or the read limit has been exceeded since the last position was
     * marked.
     */
    @Override
    public synchronized void reset() throws IOException {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.reset();
        }
        if (mark < 0) {
            throw new IOException("No position has been marked");
        }
        if (position > mark + readlimit) {
            throw new IOException("Marked position [" + mark +
                    "] is no longer valid - passed the read limit [" +
                    readlimit + "]");
        }
        position = mark;
        eof = false;
    }

    /**
     * Skips a specified number of characters.
     *
     * @param numberOfChars The number of characters to skip.
     * @return The number of characters skipped or {@code -1}
     * if the end of file has been reached and
     * {@code throwEofException} is set to {@code false}.
     * @throws EOFException if the end of file is reached and
     * {@code throwEofException} is set to {@code true}.
     * @throws IOException if trying to read past the end of file.
     */
    @Override
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