1
22
23 package com.liferay.portal.kernel.util;
24
25 import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream;
26 import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
27 import com.liferay.portal.kernel.log.Log;
28 import com.liferay.portal.kernel.log.LogFactoryUtil;
29
30 import java.io.IOException;
31 import java.io.ObjectInputStream;
32 import java.io.ObjectOutputStream;
33
34
39 public class Base64 {
40
41 protected static char getChar(int sixbit) {
42 if (sixbit >= 0 && sixbit <= 25) {
43 return (char)(65 + sixbit);
44 }
45
46 if (sixbit >= 26 && sixbit <= 51) {
47 return (char)(97 + (sixbit - 26));
48 }
49
50 if (sixbit >= 52 && sixbit <= 61) {
51 return (char)(48 + (sixbit - 52));
52 }
53
54 if (sixbit == 62) {
55 return CharPool.PLUS;
56 }
57
58 return sixbit != 63 ? CharPool.QUESTION : CharPool.SLASH;
59 }
60
61 protected static int getValue(char c) {
62 if ((c >= CharPool.UPPER_CASE_A) && (c <= CharPool.UPPER_CASE_Z)) {
63 return c - 65;
64 }
65
66 if ((c >= CharPool.LOWER_CASE_A) && (c <= CharPool.LOWER_CASE_Z)) {
67 return (c - 97) + 26;
68 }
69
70 if (c >= CharPool.NUMBER_0 && c <= CharPool.NUMBER_9) {
71 return (c - 48) + 52;
72 }
73
74 if (c == CharPool.PLUS) {
75 return 62;
76 }
77
78 if (c == CharPool.SLASH) {
79 return 63;
80 }
81
82 return c != CharPool.EQUAL ? -1 : 0;
83 }
84
85 public static String encode(byte raw[]) {
86 StringBuilder encoded = new StringBuilder();
87
88 for (int i = 0; i < raw.length; i += 3) {
89 encoded.append(encodeBlock(raw, i));
90 }
91
92 return encoded.toString();
93 }
94
95 protected static char[] encodeBlock(byte raw[], int offset) {
96 int block = 0;
97 int slack = raw.length - offset - 1;
98 int end = slack < 2 ? slack : 2;
99
100 for (int i = 0; i <= end; i++) {
101 byte b = raw[offset + i];
102
103 int neuter = b >= 0 ? ((int) (b)) : b + 256;
104 block += neuter << 8 * (2 - i);
105 }
106
107 char base64[] = new char[4];
108
109 for (int i = 0; i < 4; i++) {
110 int sixbit = block >>> 6 * (3 - i) & 0x3f;
111 base64[i] = getChar(sixbit);
112 }
113
114 if (slack < 1) {
115 base64[2] = CharPool.EQUAL;
116 }
117
118 if (slack < 2) {
119 base64[3] = CharPool.EQUAL;
120 }
121
122 return base64;
123 }
124
125 public static byte[] decode(String base64) {
126 if (Validator.isNull(base64)) {
127 return new byte[0];
128 }
129
130 int pad = 0;
131
132 for (int i = base64.length() - 1; base64.charAt(i) == CharPool.EQUAL;
133 i--) {
134
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 UnsyncByteArrayOutputStream ubaos = new UnsyncByteArrayOutputStream(
164 32000);
165
166 try {
167 ObjectOutputStream os = new ObjectOutputStream(ubaos);
168
169 os.flush();
170 os.writeObject(o);
171 os.flush();
172 }
173 catch (IOException e) {
174 _log.error(e, e);
175 }
176
177 return encode(ubaos.toByteArray());
178 }
179
180 public static Object stringToObject(String s) {
181 return stringToObject(s, null);
182 }
183
184 public static Object stringToObject(String s, ClassLoader classLoader) {
185 if (s == null) {
186 return null;
187 }
188
189 byte bytes[] = decode(s);
190
191 UnsyncByteArrayInputStream ubais = new UnsyncByteArrayInputStream(
192 bytes);
193
194 try {
195 ObjectInputStream is = null;
196
197 if (classLoader == null) {
198 is = new ObjectInputStream(ubais);
199 }
200 else {
201 is = new ClassLoaderObjectInputStream(ubais, classLoader);
202 }
203
204 return is.readObject();
205 }
206 catch (Exception e) {
207 _log.error(e, e);
208 }
209
210 return null;
211 }
212
213 private static Log _log = LogFactoryUtil.getLog(Base64.class);
214
215 }