| /* |
| * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.xml.internal.org.jvnet.staxex; |
| |
| /** |
| * @author Kohsuke Kawaguchi |
| */ |
| class Base64Encoder { |
| private static final char[] encodeMap = initEncodeMap(); |
| |
| private static char[] initEncodeMap() { |
| char[] map = new char[64]; |
| int i; |
| for( i= 0; i<26; i++ ) map[i] = (char)('A'+i); |
| for( i=26; i<52; i++ ) map[i] = (char)('a'+(i-26)); |
| for( i=52; i<62; i++ ) map[i] = (char)('0'+(i-52)); |
| map[62] = '+'; |
| map[63] = '/'; |
| |
| return map; |
| } |
| |
| public static char encode( int i ) { |
| return encodeMap[i&0x3F]; |
| } |
| |
| public static byte encodeByte( int i ) { |
| return (byte)encodeMap[i&0x3F]; |
| } |
| |
| public static String print(byte[] input, int offset, int len) { |
| char[] buf = new char[((len+2)/3)*4]; |
| int ptr = print(input,offset,len,buf,0); |
| assert ptr==buf.length; |
| return new String(buf); |
| } |
| |
| /** |
| * Encodes a byte array into a char array by doing base64 encoding. |
| * |
| * The caller must supply a big enough buffer. |
| * |
| * @return |
| * the value of {@code ptr+((len+2)/3)*4}, which is the new offset |
| * in the output buffer where the further bytes should be placed. |
| */ |
| public static int print(byte[] input, int offset, int len, char[] buf, int ptr) { |
| for( int i=offset; i<len; i+=3 ) { |
| switch( len-i ) { |
| case 1: |
| buf[ptr++] = encode(input[i]>>2); |
| buf[ptr++] = encode(((input[i])&0x3)<<4); |
| buf[ptr++] = '='; |
| buf[ptr++] = '='; |
| break; |
| case 2: |
| buf[ptr++] = encode(input[i]>>2); |
| buf[ptr++] = encode( |
| ((input[i]&0x3)<<4) | |
| ((input[i+1]>>4)&0xF)); |
| buf[ptr++] = encode((input[i+1]&0xF)<<2); |
| buf[ptr++] = '='; |
| break; |
| default: |
| buf[ptr++] = encode(input[i]>>2); |
| buf[ptr++] = encode( |
| ((input[i]&0x3)<<4) | |
| ((input[i+1]>>4)&0xF)); |
| buf[ptr++] = encode( |
| ((input[i+1]&0xF)<<2)| |
| ((input[i+2]>>6)&0x3)); |
| buf[ptr++] = encode(input[i+2]&0x3F); |
| break; |
| } |
| } |
| return ptr; |
| } |
| } |