jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/Base64Encoder.java@9c07ef4934dd

     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  */

    26 package com.sun.xml.internal.org.jvnet.staxex;

    28 /**

    29  * @author Kohsuke Kawaguchi

    30  */

    31 class Base64Encoder {

    32     private static final char[] encodeMap = initEncodeMap();

    34     private static char[] initEncodeMap() {

    35         char[] map = new char[64];

    36         int i;

    37         for( i= 0; i<26; i++ )        map[i] = (char)('A'+i);

    38         for( i=26; i<52; i++ )        map[i] = (char)('a'+(i-26));

    39         for( i=52; i<62; i++ )        map[i] = (char)('0'+(i-52));

    40         map[62] = '+';

    41         map[63] = '/';

    43         return map;

    44     }

    46     public static char encode( int i ) {

    47         return encodeMap[i&0x3F];

    48     }

    50     public static byte encodeByte( int i ) {

    51         return (byte)encodeMap[i&0x3F];

    52     }

    54     public static String print(byte[] input, int offset, int len) {

    55         char[] buf = new char[((len+2)/3)*4];

    56         int ptr = print(input,offset,len,buf,0);

    57         assert ptr==buf.length;

    58         return new String(buf);

    59     }

    61     /**

    62      * Encodes a byte array into a char array by doing base64 encoding.

    63      *

    64      * The caller must supply a big enough buffer.

    65      *

    66      * @return

    67      *      the value of {@code ptr+((len+2)/3)*4}, which is the new offset

    68      *      in the output buffer where the further bytes should be placed.

    69      */

    70     public static int print(byte[] input, int offset, int len, char[] buf, int ptr) {

    71         for( int i=offset; i<len; i+=3 ) {

    72             switch( len-i ) {

    73             case 1:

    74                 buf[ptr++] = encode(input[i]>>2);

    75                 buf[ptr++] = encode(((input[i])&0x3)<<4);

    76                 buf[ptr++] = '=';

    77                 buf[ptr++] = '=';

    78                 break;

    79             case 2:

    80                 buf[ptr++] = encode(input[i]>>2);

    81                 buf[ptr++] = encode(

    82                             ((input[i]&0x3)<<4) |

    83                             ((input[i+1]>>4)&0xF));

    84                 buf[ptr++] = encode((input[i+1]&0xF)<<2);

    85                 buf[ptr++] = '=';

    86                 break;

    87             default:

    88                 buf[ptr++] = encode(input[i]>>2);

    89                 buf[ptr++] = encode(

    90                             ((input[i]&0x3)<<4) |

    91                             ((input[i+1]>>4)&0xF));

    92                 buf[ptr++] = encode(

    93                             ((input[i+1]&0xF)<<2)|

    94                             ((input[i+2]>>6)&0x3));

    95                 buf[ptr++] = encode(input[i+2]&0x3F);

    96                 break;

    97             }

    98         }

    99         return ptr;

   100     }

   101 }

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