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  /*
   * 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;
 
This class wraps an input 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.

 
 
 public final class FromNetASCIIInputStream extends PushbackInputStream
 {
     static final boolean _noConversionRequired;
     static final String _lineSeparator;
     static final byte[] _lineSeparatorBytes;
 
     static {
          = System.getProperty("line.separator");
          = .equals("\r\n");
         try {
              = .getBytes("US-ASCII");
         } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("Broken JVM - cannot find US-ASCII charset!",e);
         }
     }
 
     private int __length = 0;

    
Returns true if the NetASCII line separator differs from the system line separator, false if they are the same. This method is useful to determine whether or not you need to instantiate a FromNetASCIIInputStream object.

Returns:
True if the NETASCII line separator differs from the local system line separator, false if they are the same.
 
     public static final boolean isConversionRequired()
     {
         return !;
     }

    
Creates a FromNetASCIIInputStream instance that wraps an existing InputStream.
 
     public FromNetASCIIInputStream(InputStream input)
     {
         super(input. + 1);
     }
 
 
     private int __read() throws IOException
     {
         int ch;
 
         ch = super.read();
 
         if (ch == '\r')
         {
             ch = super.read();
             if (ch == '\n')
             {
                 unread();
                 ch = super.read();
                 // This is a kluge for read(byte[], ...) to read the right amount
                 --;
             }
             else
             {
                 if (ch != -1) {
                     unread(ch);
                 }
                 return '\r';
             }
        }
        return ch;
    }


    
Reads and returns the next byte in the stream. If the end of the message has been reached, returns -1. Note that a call to this method may result in multiple reads from the underlying input stream in order to convert NETASCII line separators to the local line separator format. This is transparent to the programmer and is only mentioned for completeness.

Returns:
The next character in the stream. Returns -1 if the end of the stream has been reached.
Throws:
java.io.IOException If an error occurs while reading the underlying stream.
    @Override
    public int read() throws IOException
    {
        if () {
            return super.read();
        }
        return __read();
    }


    
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.

Parameters:
buffer The byte array in which to store the data.
Returns:
The number of bytes read. Returns -1 if the end of the message has been reached.
Throws:
java.io.IOException If an error occurs in reading the underlying stream.
    @Override
    public int read(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.

Parameters:
buffer The byte array in which to store the data.
offset The offset into the array at which to start storing data.
length The number of bytes to read.
Returns:
The number of bytes read. Returns -1 if the end of the stream has been reached.
Throws:
java.io.IOException If an error occurs while reading the underlying stream.
    @Override
    public int read(byte buffer[], int offsetint lengththrows IOException
    {
        if () {
            return super.read(bufferoffsetlength);
        }
        if (length < 1) {
            return 0;
        }
        int choff;
        ch = available();
         = (length > ch ? ch : length);
        // If nothing is available, block to read only one character
        if ( < 1) {
             = 1;
        }
        if ((ch = __read()) == -1) {
            return -1;
        }
        off = offset;
        do
        {
            buffer[offset++] = (byte)ch;
        }
        while (-- > 0 && (ch = __read()) != -1);
        return (offset - off);
    }
    // PushbackInputStream in JDK 1.1.3 returns the wrong thing
    // TODO - can we delete this override now?
    
Returns the number of bytes that can be read without blocking EXCEPT when newline conversions have to be made somewhere within the available block of bytes. In other words, you really should not rely on the value returned by this method if you are trying to avoid blocking.
    @Override
    public int available() throws IOException
    {
        if ( == null) {
            throw new IOException("Stream closed");
        }
        return (. - ) + .available();
    }
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