src/main/java/org/apache/commons/io/input/NullInputStream.java [305:322]:
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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) {
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src/main/java/org/apache/commons/io/input/NullReader.java [288:307]:
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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) {
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