1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*******************************************************************************
* Copyright (c) 2007, 2011 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.core;
/**
* Methods for translating Base64 encoded strings to byte arrays and back.
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public final class Base64 {
public static char[] toBase64(byte[] buf, int pos, int len) {
char[] out_buf = new char[4 * ((len + 2) / 3)];
int end = pos + len;
int out_pos = 0;
while (pos < end) {
int byte0 = buf[pos++] & 0xff;
out_buf[out_pos++] = int2char[byte0 >> 2];
if (pos == end) {
out_buf[out_pos++] = int2char[(byte0 << 4) & 0x3f];
out_buf[out_pos++] = '=';
out_buf[out_pos++] = '=';
}
else {
int byte1 = buf[pos++] & 0xff;
out_buf[out_pos++] = int2char[(byte0 << 4) & 0x3f | (byte1 >> 4)];
if (pos == end) {
out_buf[out_pos++] = int2char[(byte1 << 2) & 0x3f];
out_buf[out_pos++] = '=';
}
else {
int byte2 = buf[pos++] & 0xff;
out_buf[out_pos++] = int2char[(byte1 << 2) & 0x3f | (byte2 >> 6)];
out_buf[out_pos++] = int2char[byte2 & 0x3f];
}
}
}
assert out_pos == out_buf.length;
return out_buf;
}
public static void toByteArray(byte[] buf, int offs, int size, char[] inp) {
int out_pos = offs;
if (inp != null) {
int inp_len = inp.length;
if (inp_len % 4 != 0) {
throw new IllegalArgumentException(
"BASE64 string length must be a multiple of four.");
}
int out_len = inp_len / 4 * 3;
if (inp_len > 0 && inp[inp_len - 1] == '=') {
out_len--;
if (inp[inp_len - 2] == '=') {
out_len--;
}
}
if (out_len > size) {
throw new IllegalArgumentException(
"BASE64 data array is longer then destination buffer.");
}
int inp_pos = 0;
while (inp_pos < inp_len) {
int n0, n1, n2, n3;
char ch0 = inp[inp_pos++];
char ch1 = inp[inp_pos++];
char ch2 = inp[inp_pos++];
char ch3 = inp[inp_pos++];
if (ch0 >= char2int.length || (n0 = char2int[ch0]) < 0) {
throw new IllegalArgumentException("Illegal character " + ch0);
}
if (ch1 >= char2int.length || (n1 = char2int[ch1]) < 0) {
throw new IllegalArgumentException("Illegal character " + ch1);
}
buf[out_pos++] = (byte)((n0 << 2) | (n1 >> 4));
if (ch2 == '=') break;
if (ch2 >= char2int.length || (n2 = char2int[ch2]) < 0) {
throw new IllegalArgumentException("Illegal character " + ch2);
}
buf[out_pos++] = (byte)((n1 << 4) | (n2 >> 2));
if (ch3 == '=') break;
if (ch3 >= char2int.length || (n3 = char2int[ch3]) < 0) {
throw new IllegalArgumentException("Illegal character " + ch3);
}
buf[out_pos++] = (byte)((n2 << 6) | n3);
}
assert out_pos == offs + out_len;
}
while (out_pos < offs + size) buf[out_pos++] = 0;
}
public static byte[] toByteArray(char[] inp) {
int inp_len = inp.length;
int out_len = inp_len / 4 * 3;
if (inp_len > 0 && inp[inp_len - 1] == '=') {
out_len--;
if (inp[inp_len - 2] == '=') {
out_len--;
}
}
byte[] buf = new byte[out_len];
toByteArray(buf, 0, buf.length, inp);
return buf;
}
/*
* See RFC 2045.
*/
private static final char int2char[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'
};
/*
* See RFC 2045
*/
private static final byte char2int[] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59,
60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51
};
}
|
