1 /*

     2  * Copyright (c) 2000, 2004, 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.CharsetEncoder;

    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 import sun.nio.cs.Surrogate;

    40 

    41 

    42 public abstract class SingleByteEncoder

    43     extends CharsetEncoder

    44 {

    45 

    46     private final short index1[];

    47     private final String index2;

    48     private final int mask1;

    49     private final int mask2;

    50     private final int shift;

    51 

    52     private final Surrogate.Parser sgp = new Surrogate.Parser();

    53 

    54     protected SingleByteEncoder(Charset cs,

    55                                 short[] index1, String index2,

    56                                 int mask1, int mask2, int shift)

    57     {

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

    59         this.index1 = index1;

    60         this.index2 = index2;

    61         this.mask1 = mask1;

    62         this.mask2 = mask2;

    63         this.shift = shift;

    64     }

    65 

    66     public boolean canEncode(char c) {

    67         char testEncode = index2.charAt(index1[(c & mask1) >> shift]

    68                                         + (c & mask2));

    69         return testEncode != '\u0000' || c == '\u0000';

    70     }

    71 

    72     private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {

    73         char[] sa = src.array();

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

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

    76         assert (sp <= sl);

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

    78         byte[] da = dst.array();

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

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

    81         assert (dp <= dl);

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

    83 

    84         try {

    85             while (sp < sl) {

    86                 char c = sa[sp];

    87                 if (Character.isSurrogate(c)) {

    88                     if (sgp.parse(c, sa, sp, sl) < 0)

    89                         return sgp.error();

    90                     return sgp.unmappableResult();

    91                 }

    92                 if (c >= '\uFFFE')

    93                     return CoderResult.unmappableForLength(1);

    94                 if (dl - dp < 1)

    95                     return CoderResult.OVERFLOW;

    96 

    97                 char e = index2.charAt(index1[(c & mask1) >> shift]

    98                                        + (c & mask2));

    99 

   100                 // If output byte is zero because input char is zero

   101                 // then character is mappable, o.w. fail

   102                 if (e == '\u0000' && c != '\u0000')

   103                     return CoderResult.unmappableForLength(1);

   104 

   105                 sp++;

   106                 da[dp++] = (byte)e;

   107             }

   108             return CoderResult.UNDERFLOW;

   109         } finally {

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

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

   112         }

   113     }

   114 

   115     private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {

   116         int mark = src.position();

   117         try {

   118             while (src.hasRemaining()) {

   119                 char c = src.get();

   120                 if (Character.isSurrogate(c)) {

   121                     if (sgp.parse(c, src) < 0)

   122                         return sgp.error();

   123                     return sgp.unmappableResult();

   124                 }

   125                 if (c >= '\uFFFE')

   126                     return CoderResult.unmappableForLength(1);

   127                 if (!dst.hasRemaining())

   128                     return CoderResult.OVERFLOW;

   129 

   130                 char e = index2.charAt(index1[(c & mask1) >> shift]

   131                                        + (c & mask2));

   132 

   133                 // If output byte is zero because input char is zero

   134                 // then character is mappable, o.w. fail

   135                 if (e == '\u0000' && c != '\u0000')

   136                     return CoderResult.unmappableForLength(1);

   137 

   138                 mark++;

   139                 dst.put((byte)e);

   140             }

   141             return CoderResult.UNDERFLOW;

   142         } finally {

   143             src.position(mark);

   144         }

   145     }

   146 

   147     protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {

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

   149             return encodeArrayLoop(src, dst);

   150         else

   151             return encodeBufferLoop(src, dst);

   152     }

   153 

   154     public byte encode(char inputChar) {

   155         return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] +

   156                 (inputChar & mask2));

   157     }

   158 }