1 /*

     2  * Copyright (c) 1997, 2012, 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  * @(#)SingleByteEncoder.java   1.14 03/01/23

    28  */

    29 

    30 package com.sun.codemodel.internal.util;

    31 

    32 import java.nio.ByteBuffer;

    33 import java.nio.CharBuffer;

    34 import java.nio.charset.Charset;

    35 import java.nio.charset.CharsetEncoder;

    36 import java.nio.charset.CoderResult;

    37 

    38 import sun.nio.cs.Surrogate;

    39 

    40 

    41 abstract class SingleByteEncoder

    42     extends CharsetEncoder

    43 {

    44 

    45     private final short index1[];

    46     private final String index2;

    47     private final int mask1;

    48     private final int mask2;

    49     private final int shift;

    50 

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

    52 

    53     protected SingleByteEncoder(Charset cs,

    54                                 short[] index1, String index2,

    55                                 int mask1, int mask2, int shift)

    56     {

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

    58         this.index1 = index1;

    59         this.index2 = index2;

    60         this.mask1 = mask1;

    61         this.mask2 = mask2;

    62         this.shift = shift;

    63     }

    64 

    65     public boolean canEncode(char c) {

    66         char testEncode;

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

    68                                    + (c & mask2));

    69         if (testEncode == '\u0000')

    70             return false;

    71         else

    72             return true;

    73     }

    74 

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

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

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

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

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

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

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

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

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

    84 

    85         try {

    86             while (sp < sl) {

    87                 char c = sa[sp];

    88                 if (Surrogate.is(c)) {

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

    90                         return sgp.error();

    91                     return sgp.unmappableResult();

    92                 }

    93                 if (c >= '\uFFFE')

    94                     return CoderResult.unmappableForLength(1);

    95                 if (dl - dp < 1)

    96                     return CoderResult.OVERFLOW;

    97 

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

    99                                        + (c & mask2));

   100 

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

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

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

   104                     return CoderResult.unmappableForLength(1);

   105 

   106                 sp++;

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

   108             }

   109             return CoderResult.UNDERFLOW;

   110         } finally {

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

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

   113         }

   114     }

   115 

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

   117         int mark = src.position();

   118         try {

   119             while (src.hasRemaining()) {

   120                 char c = src.get();

   121                 if (Surrogate.is(c)) {

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

   123                         return sgp.error();

   124                     return sgp.unmappableResult();

   125                 }

   126                 if (c >= '\uFFFE')

   127                     return CoderResult.unmappableForLength(1);

   128                 if (!dst.hasRemaining())

   129                     return CoderResult.OVERFLOW;

   130 

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

   132                                        + (c & mask2));

   133 

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

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

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

   137                     return CoderResult.unmappableForLength(1);

   138 

   139                 mark++;

   140                 dst.put((byte)e);

   141             }

   142             return CoderResult.UNDERFLOW;

   143         } finally {

   144             src.position(mark);

   145         }

   146     }

   147 

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

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

   150             return encodeArrayLoop(src, dst);

   151         else

   152             return encodeBufferLoop(src, dst);

   153     }

   154 

   155     public byte encode(char inputChar) {

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

   157                 (inputChar & mask2));

   158     }

   159 }