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/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
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 * enclosed by brackets [] replaced by your own identifying information:
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 * holder.
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 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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
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package org.apache.catalina.util;

import javax.servlet.ServletOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Reader;

public final class ResponseUtil {

    /**
     * Copies the contents of the specified input stream to the specified
     * output stream.
     *
     * @param istream The input stream to read from
     * @param ostream The output stream to write to
     *
     * @return Exception that occurred during processing, or null
     */
    public static IOException copy(InputStream istream,
                                   ServletOutputStream ostream) {

        IOException exception = null;
        byte buffer[] = new byte[2048];
        int len;
        while (true) {
            try {
                len = istream.read(buffer);
                if (len == -1)
                    break;
                ostream.write(buffer, 0, len);
            } catch (IOException e) {
                exception = e;
                len = -1;
                break;
            }
        }
        return exception;

    }


    /**
     * Copies the contents of the specified input stream to the specified
     * output stream.
     *
     * @param reader The reader to read from
     * @param writer The writer to write to
     *
     * @return Exception that occurred during processing, or null
     */
    public static IOException copy(Reader reader, PrintWriter writer) {

        IOException exception = null;
        char buffer[] = new char[2048];
        int len;
        while (true) {
            try {
                len = reader.read(buffer);
                if (len == -1)
                    break;
                writer.write(buffer, 0, len);
            } catch (IOException e) {
                exception = e;
                len = -1;
                break;
            }
        }
        return exception;

    }

}