1
22
23 package com.liferay.portal.kernel.util;
24
25 import com.liferay.portal.kernel.log.Log;
26 import com.liferay.portal.kernel.log.LogFactoryUtil;
27
28 import java.io.BufferedInputStream;
29 import java.io.BufferedOutputStream;
30 import java.io.ByteArrayInputStream;
31 import java.io.IOException;
32 import java.io.ObjectInputStream;
33 import java.io.ObjectOutputStream;
34
35
41 public class Base64 {
42
43 protected static char getChar(int sixbit) {
44 if (sixbit >= 0 && sixbit <= 25) {
45 return (char)(65 + sixbit);
46 }
47
48 if (sixbit >= 26 && sixbit <= 51) {
49 return (char)(97 + (sixbit - 26));
50 }
51
52 if (sixbit >= 52 && sixbit <= 61) {
53 return (char)(48 + (sixbit - 52));
54 }
55
56 if (sixbit == 62) {
57 return '+';
58 }
59
60 return sixbit != 63 ? '?' : '/';
61 }
62
63 protected static int getValue(char c) {
64 if (c >= 'A' && c <= 'Z') {
65 return c - 65;
66 }
67
68 if (c >= 'a' && c <= 'z') {
69 return (c - 97) + 26;
70 }
71
72 if (c >= '0' && c <= '9') {
73 return (c - 48) + 52;
74 }
75
76 if (c == '+') {
77 return 62;
78 }
79
80 if (c == '/') {
81 return 63;
82 }
83
84 return c != '=' ? -1 : 0;
85 }
86
87 public static String encode(byte raw[]) {
88 StringBuilder encoded = new StringBuilder();
89
90 for (int i = 0; i < raw.length; i += 3) {
91 encoded.append(encodeBlock(raw, i));
92 }
93
94 return encoded.toString();
95 }
96
97 protected static char[] encodeBlock(byte raw[], int offset) {
98 int block = 0;
99 int slack = raw.length - offset - 1;
100 int end = slack < 2 ? slack : 2;
101
102 for (int i = 0; i <= end; i++) {
103 byte b = raw[offset + i];
104
105 int neuter = b >= 0 ? ((int) (b)) : b + 256;
106 block += neuter << 8 * (2 - i);
107 }
108
109 char base64[] = new char[4];
110
111 for (int i = 0; i < 4; i++) {
112 int sixbit = block >>> 6 * (3 - i) & 0x3f;
113 base64[i] = getChar(sixbit);
114 }
115
116 if (slack < 1) {
117 base64[2] = '=';
118 }
119
120 if (slack < 2) {
121 base64[3] = '=';
122 }
123
124 return base64;
125 }
126
127 public static byte[] decode(String base64) {
128 if (Validator.isNull(base64)) {
129 return new byte[0];
130 }
131
132 int pad = 0;
133
134 for (int i = base64.length() - 1; base64.charAt(i) == '='; i--) {
135 pad++;
136 }
137
138 int length = (base64.length() * 6) / 8 - pad;
139 byte raw[] = new byte[length];
140 int rawindex = 0;
141
142 for (int i = 0; i < base64.length(); i += 4) {
143 int block = (getValue(base64.charAt(i)) << 18) +
144 (getValue(base64.charAt(i + 1)) << 12) +
145 (getValue(base64.charAt(i + 2)) << 6) +
146 getValue(base64.charAt(i + 3));
147
148 for (int j = 0; j < 3 && rawindex + j < raw.length; j++) {
149 raw[rawindex + j] = (byte)(block >> 8 * (2 - j) & 0xff);
150 }
151
152 rawindex += 3;
153 }
154
155 return raw;
156 }
157
158 public static String objectToString(Object o) {
159 if (o == null) {
160 return null;
161 }
162
163 ByteArrayMaker bam = new ByteArrayMaker(32000);
164
165 try {
166 ObjectOutputStream os = new ObjectOutputStream(
167 new BufferedOutputStream(bam));
168
169 os.flush();
170 os.writeObject(o);
171 os.flush();
172 }
173 catch (IOException e) {
174 _log.error(e.getMessage());
175 }
176
177 return encode(bam.toByteArray());
178 }
179
180 public static Object stringToObject(String s) {
181 if (s == null) {
182 return null;
183 }
184
185 byte bytes[] = decode(s);
186
187 ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
188
189 try {
190 ObjectInputStream is = new ObjectInputStream(
191 new BufferedInputStream(bais));
192
193 return is.readObject();
194 }
195 catch (Exception e) {
196 _log.error(e.getMessage());
197 }
198
199 return null;
200 }
201
202 private static Log _log = LogFactoryUtil.getLog(Base64.class);
203
204 }