# ASCII85Filter.java

    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.apache.pdfbox.filter;

    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;

    import org.apache.pdfbox.cos.COSDictionary;
    import org.apache.pdfbox.io.IOUtils;

    /**
     * Decodes data encoded in an ASCII base-85 representation, reproducing the original binary data.
     * @author Ben Litchfield
     */
    final class ASCII85Filter extends Filter
    {
        @Override
        public DecodeResult decode(InputStream encoded, OutputStream decoded,
                                             COSDictionary parameters, int index) throws IOException
        {
            try (ASCII85InputStream is = new ASCII85InputStream(encoded))
            {
                IOUtils.copy(is, decoded);
            }
            decoded.flush();
            return new DecodeResult(parameters);
        }

        @Override
        protected void encode(InputStream input, OutputStream encoded, COSDictionary parameters)
            throws IOException
        {
            try (ASCII85OutputStream os = new ASCII85OutputStream(encoded))
            {
                IOUtils.copy(input, os);
            }
            encoded.flush();
        }
    }