* or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/**
 * Interfaces, utilities, and simple implementations of escapers and encoders. The primary type is
 * {@link Escaper}.
 *
 * <p>Additional escapers implementations are found in the applicable packages: {@link
 * com.google.common.html.HtmlEscapers} in {@code com.google.common.html}, {@link

   * the given character set encoder.
   *
   * @param reader input source
   * @param encoder character set encoder used for encoding chars to bytes
   * @param bufferSize size of internal input and output buffers
   * @throws IllegalArgumentException if bufferSize is non-positive
   */
  ReaderInputStream(Reader reader, CharsetEncoder encoder, int bufferSize) {
    this.reader = checkNotNull(reader);