1 /*

     2  * Copyright (c) 2000, 2006, 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 /*

    27  */

    28 

    29 package sun.nio.cs;

    30 

    31 import java.nio.ByteBuffer;

    32 import java.nio.CharBuffer;

    33 import java.nio.charset.Charset;

    34 import java.nio.charset.CharsetDecoder;

    35 import java.nio.charset.CoderResult;

    36 import java.nio.charset.CharacterCodingException;

    37 import java.nio.charset.MalformedInputException;

    38 import java.nio.charset.UnmappableCharacterException;

    39 

    40 

    41 public abstract class SingleByteDecoder

    42     extends CharsetDecoder

    43 {

    44 

    45     private final String byteToCharTable;

    46 

    47     protected SingleByteDecoder(Charset cs, String byteToCharTable) {

    48         super(cs, 1.0f, 1.0f);

    49         this.byteToCharTable = byteToCharTable;

    50     }

    51 

    52     private CoderResult decodeArrayLoop(ByteBuffer src, CharBuffer dst) {

    53         byte[] sa = src.array();

    54         int sp = src.arrayOffset() + src.position();

    55         int sl = src.arrayOffset() + src.limit();

    56         assert (sp <= sl);

    57         sp = (sp <= sl ? sp : sl);

    58         char[] da = dst.array();

    59         int dp = dst.arrayOffset() + dst.position();

    60         int dl = dst.arrayOffset() + dst.limit();

    61         assert (dp <= dl);

    62         dp = (dp <= dl ? dp : dl);

    63 

    64         try {

    65             while (sp < sl) {

    66                 int b = sa[sp];

    67 

    68                 char c = decode(b);

    69                 if (c == '\uFFFD')

    70                     return CoderResult.unmappableForLength(1);

    71                 if (dl - dp < 1)

    72                     return CoderResult.OVERFLOW;

    73                 da[dp++] = c;

    74                 sp++;

    75             }

    76             return CoderResult.UNDERFLOW;

    77         } finally {

    78             src.position(sp - src.arrayOffset());

    79             dst.position(dp - dst.arrayOffset());

    80         }

    81     }

    82 

    83     private CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {

    84         int mark = src.position();

    85         try {

    86             while (src.hasRemaining()) {

    87                 int b = src.get();

    88 

    89                 char c = decode(b);

    90                 if (c == '\uFFFD')

    91                     return CoderResult.unmappableForLength(1);

    92                 if (!dst.hasRemaining())

    93                     return CoderResult.OVERFLOW;

    94                 mark++;

    95                 dst.put(c);

    96             }

    97             return CoderResult.UNDERFLOW;

    98         } finally {

    99             src.position(mark);

   100         }

   101     }

   102 

   103     protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {

   104         if (true && src.hasArray() && dst.hasArray())

   105             return decodeArrayLoop(src, dst);

   106         else

   107             return decodeBufferLoop(src, dst);

   108     }

   109 

   110     public char decode(int byteIndex) {

   111         int n = byteIndex + 128;

   112         if (n >= byteToCharTable.length() || n < 0)

   113             return '\uFFFD';

   114         return byteToCharTable.charAt(n);

   115     }

   116 }