commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/io/FromNetASCIIOutputStream.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.commons.net.io;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * This class wraps an output stream, replacing all occurrences
 * of <CR><LF> (carriage return followed by a linefeed),
 * which is the NETASCII standard for representing a newline, with the
 * local line separator representation.  You would use this class to
 * implement ASCII file transfers requiring conversion from NETASCII.
 * <p>
 * Because of the translation process, a call to <code>flush()</code> will
 * not flush the last byte written if that byte was a carriage
 * return.  A call to {@link #close  close() }, however, will
 * flush the carriage return.
 *
 *
 */

public final class FromNetASCIIOutputStream extends FilterOutputStream
{
    private boolean lastWasCR;

    /**
     * Creates a FromNetASCIIOutputStream instance that wraps an existing
     * OutputStream.
     *
     * @param output  The OutputStream to wrap.
     */
    public FromNetASCIIOutputStream(final OutputStream output)
    {
        super(output);
        lastWasCR = false;
    }


    private void writeInt(final int ch) throws IOException
    {
        switch (ch)
        {
        case '\r':
            lastWasCR = true;
            // Don't write anything.  We need to see if next one is linefeed
            break;
        case '\n':
            if (lastWasCR)
            {
                out.write(FromNetASCIIInputStream._lineSeparatorBytes);
                lastWasCR = false;
                break;
            }
            lastWasCR = false;
            out.write('\n');
            break;
        default:
            if (lastWasCR)
            {
                out.write('\r');
                lastWasCR = false;
            }
            out.write(ch);
            break;
        }
    }


    /**
     * Writes a byte to the stream.    Note that a call to this method
     * might not actually write a byte to the underlying stream until a
     * subsequent character is written, from which it can be determined if
     * a NETASCII line separator was encountered.
     * This is transparent to the programmer and is only mentioned for
     * completeness.
     *
     * @param ch The byte to write.
     * @throws IOException If an error occurs while writing to the underlying
     *            stream.
     */
    @Override
    public synchronized void write(final int ch)
    throws IOException
    {
        if (FromNetASCIIInputStream._noConversionRequired)
        {
            out.write(ch);
            return ;
        }

        writeInt(ch);
    }


    /**
     * Writes a byte array to the stream.
     *
     * @param buffer  The byte array to write.
     * @throws IOException If an error occurs while writing to the underlying
     *            stream.
     */
    @Override
    public synchronized void write(final byte buffer[])
    throws IOException
    {
        write(buffer, 0, buffer.length);
    }


    /**
     * Writes a number of bytes from a byte array to the stream starting from
     * a given offset.
     *
     * @param buffer  The byte array to write.
     * @param offset  The offset into the array at which to start copying data.
     * @param length  The number of bytes to write.
     * @throws IOException If an error occurs while writing to the underlying
     *            stream.
     */
    @Override
    public synchronized void write(final byte buffer[], int offset, int length)
    throws IOException
    {
        if (FromNetASCIIInputStream._noConversionRequired)
        {
            // FilterOutputStream method is very slow.
            //super.write(buffer, offset, length);
            out.write(buffer, offset, length);
            return ;
        }

        while (length-- > 0) {
            writeInt(buffer[offset++]);
        }
    }


    /**
     * Closes the stream, writing all pending data.
     *
     * @throws IOException  If an error occurs while closing the stream.
     */
    @Override
    public synchronized void close()
    throws IOException
    {
        if (FromNetASCIIInputStream._noConversionRequired)
        {
            super.close();
            return ;
        }

        if (lastWasCR) {
            out.write('\r');
        }
        super.close();
    }
}

⏎ org/apache/commons/net/io/FromNetASCIIOutputStream.java

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File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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