001
014
015 package com.liferay.portal.kernel.util;
016
017 import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream;
018 import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
019 import com.liferay.portal.kernel.log.Log;
020 import com.liferay.portal.kernel.log.LogFactoryUtil;
021
022 import java.io.ObjectInputStream;
023 import java.io.ObjectOutputStream;
024
025
028 public class Base64 {
029
030 protected static char getChar(int sixbit) {
031 if (sixbit >= 0 && sixbit <= 25) {
032 return (char)(65 + sixbit);
033 }
034
035 if (sixbit >= 26 && sixbit <= 51) {
036 return (char)(97 + (sixbit - 26));
037 }
038
039 if (sixbit >= 52 && sixbit <= 61) {
040 return (char)(48 + (sixbit - 52));
041 }
042
043 if (sixbit == 62) {
044 return CharPool.PLUS;
045 }
046
047 return sixbit != 63 ? CharPool.QUESTION : CharPool.SLASH;
048 }
049
050 protected static int getValue(char c) {
051 if ((c >= CharPool.UPPER_CASE_A) && (c <= CharPool.UPPER_CASE_Z)) {
052 return c - 65;
053 }
054
055 if ((c >= CharPool.LOWER_CASE_A) && (c <= CharPool.LOWER_CASE_Z)) {
056 return (c - 97) + 26;
057 }
058
059 if (c >= CharPool.NUMBER_0 && c <= CharPool.NUMBER_9) {
060 return (c - 48) + 52;
061 }
062
063 if (c == CharPool.PLUS) {
064 return 62;
065 }
066
067 if (c == CharPool.SLASH) {
068 return 63;
069 }
070
071 return c != CharPool.EQUAL ? -1 : 0;
072 }
073
074 public static String encode(byte raw[]) {
075 return encode(raw, 0, raw.length);
076 }
077
078 public static String encode(byte raw[], int offset, int length) {
079 int lastIndex = Math.min(raw.length, offset + length);
080
081 StringBuilder sb = new StringBuilder(
082 ((lastIndex - offset) / 3 + 1) * 4);
083
084 for (int i = offset; i < lastIndex; i += 3) {
085 sb.append(encodeBlock(raw, i, lastIndex));
086 }
087
088 return sb.toString();
089 }
090
091 protected static char[] encodeBlock(byte raw[], int offset, int lastIndex) {
092 int block = 0;
093 int slack = lastIndex - offset - 1;
094 int end = slack < 2 ? slack : 2;
095
096 for (int i = 0; i <= end; i++) {
097 byte b = raw[offset + i];
098
099 int neuter = b >= 0 ? ((int) (b)) : b + 256;
100 block += neuter << 8 * (2 - i);
101 }
102
103 char base64[] = new char[4];
104
105 for (int i = 0; i < 4; i++) {
106 int sixbit = block >>> 6 * (3 - i) & 0x3f;
107 base64[i] = getChar(sixbit);
108 }
109
110 if (slack < 1) {
111 base64[2] = CharPool.EQUAL;
112 }
113
114 if (slack < 2) {
115 base64[3] = CharPool.EQUAL;
116 }
117
118 return base64;
119 }
120
121 public static byte[] decode(String base64) {
122 if (Validator.isNull(base64)) {
123 return new byte[0];
124 }
125
126 int pad = 0;
127
128 for (int i = base64.length() - 1; base64.charAt(i) == CharPool.EQUAL;
129 i--) {
130
131 pad++;
132 }
133
134 int length = (base64.length() * 6) / 8 - pad;
135 byte raw[] = new byte[length];
136 int rawindex = 0;
137
138 for (int i = 0; i < base64.length(); i += 4) {
139 int block = (getValue(base64.charAt(i)) << 18) +
140 (getValue(base64.charAt(i + 1)) << 12) +
141 (getValue(base64.charAt(i + 2)) << 6) +
142 getValue(base64.charAt(i + 3));
143
144 for (int j = 0; j < 3 && rawindex + j < raw.length; j++) {
145 raw[rawindex + j] = (byte)(block >> 8 * (2 - j) & 0xff);
146 }
147
148 rawindex += 3;
149 }
150
151 return raw;
152 }
153
154 public static String fromURLSafe(String base64) {
155 return StringUtil.replace(
156 base64,
157 new String[] {
158 StringPool.MINUS,
159 StringPool.STAR,
160 StringPool.UNDERLINE
161 },
162 new String[] {
163 StringPool.PLUS,
164 StringPool.EQUAL,
165 StringPool.SLASH
166 });
167 }
168
169 public static String objectToString(Object o) {
170 if (o == null) {
171 return null;
172 }
173
174 UnsyncByteArrayOutputStream ubaos = new UnsyncByteArrayOutputStream(
175 32000);
176
177 try {
178 ObjectOutputStream os = new ObjectOutputStream(ubaos);
179
180 os.flush();
181 os.writeObject(o);
182 os.flush();
183 }
184 catch (Exception e) {
185 _log.error(e, e);
186 }
187
188 return encode(ubaos.unsafeGetByteArray(), 0, ubaos.size());
189 }
190
191 public static Object stringToObject(String s) {
192 return _stringToObject(s, null, false);
193 }
194
195 public static Object stringToObject(String s, ClassLoader classLoader) {
196 return _stringToObject(s, classLoader, false);
197 }
198
199 public static Object stringToObjectSilent(String s) {
200 return _stringToObject(s, null, true);
201 }
202
203 public static Object stringToObjectSilent(
204 String s, ClassLoader classLoader) {
205
206 return _stringToObject(s, classLoader, true);
207 }
208
209 public static String toURLSafe(String base64) {
210 return StringUtil.replace(
211 base64,
212 new String[] {
213 StringPool.PLUS,
214 StringPool.EQUAL,
215 StringPool.SLASH
216 },
217 new String[] {
218 StringPool.MINUS,
219 StringPool.STAR,
220 StringPool.UNDERLINE
221 });
222 }
223
224 private static Object _stringToObject(
225 String s, ClassLoader classLoader, boolean silent) {
226
227 if (s == null) {
228 return null;
229 }
230
231 byte bytes[] = decode(s);
232
233 UnsyncByteArrayInputStream ubais = new UnsyncByteArrayInputStream(
234 bytes);
235
236 try {
237 ObjectInputStream is = null;
238
239 if (classLoader == null) {
240 is = new ObjectInputStream(ubais);
241 }
242 else {
243 is = new ClassLoaderObjectInputStream(ubais, classLoader);
244 }
245
246 return is.readObject();
247 }
248 catch (Exception e) {
249 if (!silent) {
250 _log.error(e, e);
251 }
252 }
253
254 return null;
255 }
256
257 private static Log _log = LogFactoryUtil.getLog(Base64.class);
258
259 }