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.IOException;
023 import java.io.ObjectInputStream;
024 import java.io.ObjectOutputStream;
025
026
029 public class Base64 {
030
031 protected static char getChar(int sixbit) {
032 if (sixbit >= 0 && sixbit <= 25) {
033 return (char)(65 + sixbit);
034 }
035
036 if (sixbit >= 26 && sixbit <= 51) {
037 return (char)(97 + (sixbit - 26));
038 }
039
040 if (sixbit >= 52 && sixbit <= 61) {
041 return (char)(48 + (sixbit - 52));
042 }
043
044 if (sixbit == 62) {
045 return CharPool.PLUS;
046 }
047
048 return sixbit != 63 ? CharPool.QUESTION : CharPool.SLASH;
049 }
050
051 protected static int getValue(char c) {
052 if ((c >= CharPool.UPPER_CASE_A) && (c <= CharPool.UPPER_CASE_Z)) {
053 return c - 65;
054 }
055
056 if ((c >= CharPool.LOWER_CASE_A) && (c <= CharPool.LOWER_CASE_Z)) {
057 return (c - 97) + 26;
058 }
059
060 if (c >= CharPool.NUMBER_0 && c <= CharPool.NUMBER_9) {
061 return (c - 48) + 52;
062 }
063
064 if (c == CharPool.PLUS) {
065 return 62;
066 }
067
068 if (c == CharPool.SLASH) {
069 return 63;
070 }
071
072 return c != CharPool.EQUAL ? -1 : 0;
073 }
074
075 public static String encode(byte raw[]) {
076 return encode(raw, 0, raw.length);
077 }
078
079 public static String encode(byte raw[], int offset, int length) {
080 int lastIndex = Math.min(raw.length, offset + length);
081
082 StringBuilder sb = new StringBuilder(
083 ((lastIndex - offset) / 3 + 1) * 4);
084
085 for (int i = offset; i < lastIndex; i += 3) {
086 sb.append(encodeBlock(raw, i, lastIndex));
087 }
088
089 return sb.toString();
090 }
091
092 protected static char[] encodeBlock(byte raw[], int offset, int lastIndex) {
093 int block = 0;
094 int slack = lastIndex - offset - 1;
095 int end = slack < 2 ? slack : 2;
096
097 for (int i = 0; i <= end; i++) {
098 byte b = raw[offset + i];
099
100 int neuter = b >= 0 ? ((int) (b)) : b + 256;
101 block += neuter << 8 * (2 - i);
102 }
103
104 char base64[] = new char[4];
105
106 for (int i = 0; i < 4; i++) {
107 int sixbit = block >>> 6 * (3 - i) & 0x3f;
108 base64[i] = getChar(sixbit);
109 }
110
111 if (slack < 1) {
112 base64[2] = CharPool.EQUAL;
113 }
114
115 if (slack < 2) {
116 base64[3] = CharPool.EQUAL;
117 }
118
119 return base64;
120 }
121
122 public static byte[] decode(String base64) {
123 if (Validator.isNull(base64)) {
124 return new byte[0];
125 }
126
127 int pad = 0;
128
129 for (int i = base64.length() - 1; base64.charAt(i) == CharPool.EQUAL;
130 i--) {
131
132 pad++;
133 }
134
135 int length = (base64.length() * 6) / 8 - pad;
136 byte raw[] = new byte[length];
137 int rawindex = 0;
138
139 for (int i = 0; i < base64.length(); i += 4) {
140 int block = (getValue(base64.charAt(i)) << 18) +
141 (getValue(base64.charAt(i + 1)) << 12) +
142 (getValue(base64.charAt(i + 2)) << 6) +
143 getValue(base64.charAt(i + 3));
144
145 for (int j = 0; j < 3 && rawindex + j < raw.length; j++) {
146 raw[rawindex + j] = (byte)(block >> 8 * (2 - j) & 0xff);
147 }
148
149 rawindex += 3;
150 }
151
152 return raw;
153 }
154
155 public static String objectToString(Object o) {
156 if (o == null) {
157 return null;
158 }
159
160 UnsyncByteArrayOutputStream ubaos = new UnsyncByteArrayOutputStream(
161 32000);
162
163 try {
164 ObjectOutputStream os = new ObjectOutputStream(ubaos);
165
166 os.flush();
167 os.writeObject(o);
168 os.flush();
169 }
170 catch (IOException e) {
171 _log.error(e, e);
172 }
173
174 return encode(ubaos.unsafeGetByteArray(), 0, ubaos.size());
175 }
176
177 public static Object stringToObject(String s) {
178 return stringToObject(s, null);
179 }
180
181 public static Object stringToObject(String s, ClassLoader classLoader) {
182 if (s == null) {
183 return null;
184 }
185
186 byte bytes[] = decode(s);
187
188 UnsyncByteArrayInputStream ubais = new UnsyncByteArrayInputStream(
189 bytes);
190
191 try {
192 ObjectInputStream is = null;
193
194 if (classLoader == null) {
195 is = new ObjectInputStream(ubais);
196 }
197 else {
198 is = new ClassLoaderObjectInputStream(ubais, classLoader);
199 }
200
201 return is.readObject();
202 }
203 catch (Exception e) {
204 _log.error(e, e);
205 }
206
207 return null;
208 }
209
210 private static Log _log = LogFactoryUtil.getLog(Base64.class);
211
212 }