1
19
20 package com.liferay.portal.kernel.util;
21
22 import com.liferay.portal.kernel.log.Log;
23 import com.liferay.portal.kernel.log.LogFactoryUtil;
24
25 import java.io.BufferedInputStream;
26 import java.io.BufferedOutputStream;
27 import java.io.ByteArrayInputStream;
28 import java.io.IOException;
29 import java.io.ObjectInputStream;
30 import java.io.ObjectOutputStream;
31
32
38 public class Base64 {
39
40 protected static char getChar(int sixbit) {
41 if (sixbit >= 0 && sixbit <= 25) {
42 return (char)(65 + sixbit);
43 }
44
45 if (sixbit >= 26 && sixbit <= 51) {
46 return (char)(97 + (sixbit - 26));
47 }
48
49 if (sixbit >= 52 && sixbit <= 61) {
50 return (char)(48 + (sixbit - 52));
51 }
52
53 if (sixbit == 62) {
54 return '+';
55 }
56
57 return sixbit != 63 ? '?' : '/';
58 }
59
60 protected static int getValue(char c) {
61 if (c >= 'A' && c <= 'Z') {
62 return c - 65;
63 }
64
65 if (c >= 'a' && c <= 'z') {
66 return (c - 97) + 26;
67 }
68
69 if (c >= '0' && c <= '9') {
70 return (c - 48) + 52;
71 }
72
73 if (c == '+') {
74 return 62;
75 }
76
77 if (c == '/') {
78 return 63;
79 }
80
81 return c != '=' ? -1 : 0;
82 }
83
84 public static String encode(byte raw[]) {
85 StringBuilder encoded = new StringBuilder();
86
87 for (int i = 0; i < raw.length; i += 3) {
88 encoded.append(encodeBlock(raw, i));
89 }
90
91 return encoded.toString();
92 }
93
94 protected static char[] encodeBlock(byte raw[], int offset) {
95 int block = 0;
96 int slack = raw.length - offset - 1;
97 int end = slack < 2 ? slack : 2;
98
99 for (int i = 0; i <= end; i++) {
100 byte b = raw[offset + i];
101
102 int neuter = b >= 0 ? ((int) (b)) : b + 256;
103 block += neuter << 8 * (2 - i);
104 }
105
106 char base64[] = new char[4];
107
108 for (int i = 0; i < 4; i++) {
109 int sixbit = block >>> 6 * (3 - i) & 0x3f;
110 base64[i] = getChar(sixbit);
111 }
112
113 if (slack < 1) {
114 base64[2] = '=';
115 }
116
117 if (slack < 2) {
118 base64[3] = '=';
119 }
120
121 return base64;
122 }
123
124 public static byte[] decode(String base64) {
125 int pad = 0;
126
127 for (int i = base64.length() - 1; base64.charAt(i) == '='; i--) {
128 pad++;
129 }
130
131 int length = (base64.length() * 6) / 8 - pad;
132 byte raw[] = new byte[length];
133 int rawindex = 0;
134
135 for (int i = 0; i < base64.length(); i += 4) {
136 int block = (getValue(base64.charAt(i)) << 18) +
137 (getValue(base64.charAt(i + 1)) << 12) +
138 (getValue(base64.charAt(i + 2)) << 6) +
139 getValue(base64.charAt(i + 3));
140
141 for (int j = 0; j < 3 && rawindex + j < raw.length; j++) {
142 raw[rawindex + j] = (byte)(block >> 8 * (2 - j) & 0xff);
143 }
144
145 rawindex += 3;
146 }
147
148 return raw;
149 }
150
151 public static String objectToString(Object o) {
152 if (o == null) {
153 return null;
154 }
155
156 ByteArrayMaker bam = new ByteArrayMaker(32000);
157
158 try {
159 ObjectOutputStream os = new ObjectOutputStream(
160 new BufferedOutputStream(bam));
161
162 os.flush();
163 os.writeObject(o);
164 os.flush();
165 }
166 catch (IOException e) {
167 _log.error(e.getMessage());
168 }
169
170 return encode(bam.toByteArray());
171 }
172
173 public static Object stringToObject(String s) {
174 if (s == null) {
175 return null;
176 }
177
178 byte bytes[] = decode(s);
179
180 ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
181
182 try {
183 ObjectInputStream is = new ObjectInputStream(
184 new BufferedInputStream(bais));
185
186 return is.readObject();
187 }
188 catch (Exception e) {
189 _log.error(e.getMessage());
190 }
191
192 return null;
193 }
194
195 private static Log _log = LogFactoryUtil.getLog(Base64.class);
196
197 }