1 /*

     2  * Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.io;

    27 

    28 /**

    29  * A algorithmic conversion from ASCII to Unicode

    30  *

    31  * @author Limin Shi

    32  */

    33 public class ByteToCharASCII extends ByteToCharConverter {

    34 

    35     // Return the character set id

    36     public String getCharacterEncoding()

    37     {

    38         return "ASCII";

    39     }

    40 

    41     public int flush(char[] output, int outStart, int outEnd) {

    42         // This converter will not buffer any data.

    43         byteOff = charOff = 0;

    44         return 0;

    45     }

    46 

    47     /**

    48      * Algorithmic character conversion

    49      */

    50     public int convert(byte[] input, int inOff, int inEnd,

    51                        char[] output, int outOff, int outEnd)

    52         throws ConversionBufferFullException, UnknownCharacterException

    53     {

    54         byte    inputByte;

    55 

    56         charOff = outOff;

    57         byteOff = inOff;

    58 

    59         // Loop until we hit the end of the input

    60         while(byteOff < inEnd)

    61         {

    62             // If we don't have room for the output, throw an exception

    63             if (charOff >= outEnd)

    64                 throw new ConversionBufferFullException();

    65 

    66             // Convert the input byte

    67             inputByte = input[byteOff++];

    68 

    69             if (inputByte >= 0)

    70                 output[charOff++] = (char)inputByte;

    71             else {

    72                 if (subMode)

    73                     output[charOff++] = '\uFFFD';       // Replace Char

    74                 else {

    75                     badInputLength = 1;

    76                     throw new UnknownCharacterException();

    77                 }

    78             }

    79         }

    80 

    81         // Return the length written to the output buffer

    82         return charOff-outOff;

    83     }

    84 

    85     /*

    86      *   Reset after finding bad input

    87      */

    88     public void reset() {

    89         byteOff = charOff = 0;

    90     }

    91 

    92 }