jdk/src/java.base/share/classes/sun/reflect/UTF8.java
changeset 37377 bd3b98a11a14
parent 37376 5daa5fbad3ce
parent 37374 ee1b8619eddb
child 37380 55c2549714af
equal deleted inserted replaced
37376:5daa5fbad3ce 37377:bd3b98a11a14
     1 /*
       
     2  * Copyright (c) 2001, 2011, 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.reflect;
       
    27 
       
    28 /** It is necessary to use a "bootstrap" UTF-8 encoder for encoding
       
    29     constant pool entries because the character set converters rely on
       
    30     Class.newInstance(). */
       
    31 
       
    32 class UTF8 {
       
    33     // This encoder is not quite correct.  It does not handle surrogate pairs.
       
    34     static byte[] encode(String str) {
       
    35         int len = str.length();
       
    36         byte[] res = new byte[utf8Length(str)];
       
    37         int utf8Idx = 0;
       
    38         try {
       
    39             for (int i = 0; i < len; i++) {
       
    40                 int c = str.charAt(i) & 0xFFFF;
       
    41                 if (c >= 0x0001 && c <= 0x007F) {
       
    42                     res[utf8Idx++] = (byte) c;
       
    43                 } else if (c == 0x0000 ||
       
    44                            (c >= 0x0080 && c <= 0x07FF)) {
       
    45                     res[utf8Idx++] = (byte) (0xC0 + (c >> 6));
       
    46                     res[utf8Idx++] = (byte) (0x80 + (c & 0x3F));
       
    47                 } else {
       
    48                     res[utf8Idx++] = (byte) (0xE0 + (c >> 12));
       
    49                     res[utf8Idx++] = (byte) (0x80 + ((c >> 6) & 0x3F));
       
    50                     res[utf8Idx++] = (byte) (0x80 + (c & 0x3F));
       
    51                 }
       
    52             }
       
    53         } catch (ArrayIndexOutOfBoundsException e) {
       
    54             throw new InternalError
       
    55                 ("Bug in sun.reflect bootstrap UTF-8 encoder", e);
       
    56         }
       
    57         return res;
       
    58     }
       
    59 
       
    60     private static int utf8Length(String str) {
       
    61         int len = str.length();
       
    62         int utf8Len = 0;
       
    63         for (int i = 0; i < len; i++) {
       
    64             int c = str.charAt(i) & 0xFFFF;
       
    65             if (c >= 0x0001 && c <= 0x007F) {
       
    66                 utf8Len += 1;
       
    67             } else if (c == 0x0000 ||
       
    68                        (c >= 0x0080 && c <= 0x07FF)) {
       
    69                 utf8Len += 2;
       
    70             } else {
       
    71                 utf8Len += 3;
       
    72             }
       
    73         }
       
    74         return utf8Len;
       
    75     }
       
    76 }