Coverage report

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org.apache.commons.net.io.ToNetASCIIInputStream
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 1  
 /*
 2  
  * Copyright 2001-2005 The Apache Software Foundation
 3  
  *
 4  
  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *     http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 package org.apache.commons.net.io;
 17  
 
 18  
 import java.io.FilterInputStream;
 19  
 import java.io.IOException;
 20  
 import java.io.InputStream;
 21  
 
 22  
 /***
 23  
  * This class wraps an input stream, replacing all singly occurring
 24  
  * <LF> (linefeed) characters with <CR><LF> (carriage return
 25  
  * followed by linefeed), which is the NETASCII standard for representing
 26  
  * a newline.
 27  
  * You would use this class to implement ASCII file transfers requiring
 28  
  * conversion to NETASCII.
 29  
  * <p>
 30  
  * <p>
 31  
  * @author Daniel F. Savarese
 32  
  ***/
 33  
 
 34  
 public final class ToNetASCIIInputStream extends FilterInputStream
 35  
 {
 36  
     private static final int __NOTHING_SPECIAL = 0;
 37  
     private static final int __LAST_WAS_CR = 1;
 38  
     private static final int __LAST_WAS_NL = 2;
 39  
     private int __status;
 40  
 
 41  
     /***
 42  
      * Creates a ToNetASCIIInputStream instance that wraps an existing
 43  
      * InputStream.
 44  
      * <p>
 45  
      * @param input  The InputStream to .
 46  
      ***/
 47  
     public ToNetASCIIInputStream(InputStream input)
 48  
     {
 49  0
         super(input);
 50  0
         __status = __NOTHING_SPECIAL;
 51  0
     }
 52  
 
 53  
 
 54  
     /***
 55  
      * Reads and returns the next byte in the stream.  If the end of the
 56  
      * message has been reached, returns -1.
 57  
      * <p>
 58  
      * @return The next character in the stream. Returns -1 if the end of the
 59  
      *          stream has been reached.
 60  
      * @exception IOException If an error occurs while reading the underlying
 61  
      *            stream.
 62  
      ***/
 63  
     public int read() throws IOException
 64  
     {
 65  
         int ch;
 66  
 
 67  0
         if (__status == __LAST_WAS_NL)
 68  
         {
 69  0
             __status = __NOTHING_SPECIAL;
 70  0
             return '\n';
 71  
         }
 72  
 
 73  0
         ch = in.read();
 74  
 
 75  0
         switch (ch)
 76  
         {
 77  
         case '\r':
 78  0
             __status = __LAST_WAS_CR;
 79  0
             return '\r';
 80  
         case '\n':
 81  0
             if (__status != __LAST_WAS_CR)
 82  
             {
 83  0
                 __status = __LAST_WAS_NL;
 84  0
                 return '\r';
 85  
             }
 86  
             // else fall through
 87  
         default:
 88  0
             __status = __NOTHING_SPECIAL;
 89  0
             return ch;
 90  
         }
 91  
         // statement not reached
 92  
         //return ch;
 93  
     }
 94  
 
 95  
 
 96  
     /***
 97  
      * Reads the next number of bytes from the stream into an array and
 98  
      * returns the number of bytes read.  Returns -1 if the end of the
 99  
      * stream has been reached.
 100  
      * <p>
 101  
      * @param buffer  The byte array in which to store the data.
 102  
      * @return The number of bytes read. Returns -1 if the
 103  
      *          end of the message has been reached.
 104  
      * @exception IOException If an error occurs in reading the underlying
 105  
      *            stream.
 106  
      ***/
 107  
     public int read(byte buffer[]) throws IOException
 108  
     {
 109  0
         return read(buffer, 0, buffer.length);
 110  
     }
 111  
 
 112  
 
 113  
     /***
 114  
      * Reads the next number of bytes from the stream into an array and returns
 115  
      * the number of bytes read.  Returns -1 if the end of the
 116  
      * message has been reached.  The characters are stored in the array
 117  
      * starting from the given offset and up to the length specified.
 118  
      * <p>
 119  
      * @param buffer The byte array in which to store the data.
 120  
      * @param offset  The offset into the array at which to start storing data.
 121  
      * @param length   The number of bytes to read.
 122  
      * @return The number of bytes read. Returns -1 if the
 123  
      *          end of the stream has been reached.
 124  
      * @exception IOException If an error occurs while reading the underlying
 125  
      *            stream.
 126  
      ***/
 127  
     public int read(byte buffer[], class="keyword">int offset, class="keyword">int length) throws IOException
 128  
     {
 129  
         int ch, off;
 130  
 
 131  0
         if (length < 1)
 132  0
             return 0;
 133  
 
 134  0
         ch = available();
 135  
 
 136  0
         if (length > ch)
 137  0
             length = ch;
 138  
 
 139  
         // If nothing is available, block to read only one character
 140  0
         if (length < 1)
 141  0
             length = 1;
 142  
 
 143  0
         if ((ch = read()) == -1)
 144  0
             return -1;
 145  
 
 146  0
         off = offset;
 147  
 
 148  
         do
 149  
         {
 150  0
             buffer[offset++] = (byte)ch;
 151  
         }
 152  0
         while (--length > 0 && (ch = read()) != -1);
 153  
 
 154  0
         return (offset - off);
 155  
     }
 156  
 
 157  
     /*** Returns false.  Mark is not supported. ***/
 158  
     public boolean markSupported()
 159  
     {
 160  0
         return false;
 161  
     }
 162  
 
 163  
     public int available() throws IOException
 164  
     {
 165  
         int result;
 166  
 
 167  0
         result = in.available();
 168  
 
 169  0
         if (__status == __LAST_WAS_NL)
 170  0
             return (result + 1);
 171  
 
 172  0
         return result;
 173  
     }
 174  
 }

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