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/ToNetASCIIInputStream.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.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * This class wraps an input stream, replacing all singly occurring
 * <LF> (linefeed) characters with <CR><LF> (carriage return
 * followed by linefeed), which is the NETASCII standard for representing
 * a newline.
 * You would use this class to implement ASCII file transfers requiring
 * conversion to NETASCII.
 *
 *
 */

public final class ToNetASCIIInputStream extends FilterInputStream
{
    private static final int NOTHING_SPECIAL = 0;
    private static final int LAST_WAS_CR = 1;
    private static final int LAST_WAS_NL = 2;
    private int status;

    /**
     * Creates a ToNetASCIIInputStream instance that wraps an existing
     * InputStream.
     *
     * @param input  The InputStream to wrap.
     */
    public ToNetASCIIInputStream(final InputStream input)
    {
        super(input);
        status = NOTHING_SPECIAL;
    }


    /**
     * Reads and returns the next byte in the stream.  If the end of the
     * message has been reached, returns -1.
     *
     * @return The next character in the stream. Returns -1 if the end of the
     *          stream has been reached.
     * @throws IOException If an error occurs while reading the underlying
     *            stream.
     */
    @Override
    public int read() throws IOException
    {
        final int ch;

        if (status == LAST_WAS_NL)
        {
            status = NOTHING_SPECIAL;
            return '\n';
        }

        ch = in.read();

        switch (ch)
        {
        case '\r':
            status = LAST_WAS_CR;
            return '\r';
        case '\n':
            if (status != LAST_WAS_CR)
            {
                status = LAST_WAS_NL;
                return '\r';
            }
            //$FALL-THROUGH$
        default:
            status = NOTHING_SPECIAL;
            return ch;
        }
        // statement not reached
        //return ch;
    }


    /**
     * Reads the next number of bytes from the stream into an array and
     * returns the number of bytes read.  Returns -1 if the end of the
     * stream has been reached.
     *
     * @param buffer  The byte array in which to store the data.
     * @return The number of bytes read. Returns -1 if the
     *          end of the message has been reached.
     * @throws IOException If an error occurs in reading the underlying
     *            stream.
     */
    @Override
    public int read(final byte[] buffer) throws IOException
    {
        return read(buffer, 0, buffer.length);
    }


    /**
     * Reads the next number of bytes from the stream into an array and returns
     * the number of bytes read.  Returns -1 if the end of the
     * message has been reached.  The characters are stored in the array
     * starting from the given offset and up to the length specified.
     *
     * @param buffer The byte array in which to store the data.
     * @param offset  The offset into the array at which to start storing data.
     * @param length   The number of bytes to read.
     * @return The number of bytes read. Returns -1 if the
     *          end of the stream has been reached.
     * @throws IOException If an error occurs while reading the underlying
     *            stream.
     */
    @Override
    public int read(final byte[] buffer, int offset, int length) throws IOException
    {
        int ch;
        final int off;

        if (length < 1) {
            return 0;
        }

        ch = available();

        if (length > ch) {
            length = ch;
        }

        // If nothing is available, block to read only one character
        if (length < 1) {
            length = 1;
        }

        if ((ch = read()) == -1) {
            return -1;
        }

        off = offset;

        do
        {
            buffer[offset++] = (byte)ch;
        }
        while (--length > 0 && (ch = read()) != -1);

        return offset - off;
    }

    /** Returns false.  Mark is not supported. */
    @Override
    public boolean markSupported()
    {
        return false;
    }

    @Override
    public int available() throws IOException
    {
        final int result;

        result = in.available();

        if (status == LAST_WAS_NL) {
            return result + 1;
        }

        return result;
    }
}

⏎ org/apache/commons/net/io/ToNetASCIIInputStream.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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