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