/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* Base64.java *
* *
* Base64 for Java. *
* *
* LastModified: Apr 27, 2015 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package hprose.util;
import hprose.io.ByteBufferStream;
public final class Base64 {
private final static char[] base64EncodeChars = new char[] {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/' };
private final static byte[] base64DecodeChars = new byte[] {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };
public final static String encode(byte[] data) {
StringBuilder sb = new StringBuilder();
int r = data.length % 3;
int len = data.length - r;
int i = 0;
int c;
while (i < len) {
c = (0x000000ff & data[i++]) << 16 |
(0x000000ff & data[i++]) << 8 |
(0x000000ff & data[i++]);
sb.append(base64EncodeChars[c >> 18]);
sb.append(base64EncodeChars[c >> 12 & 0x3f]);
sb.append(base64EncodeChars[c >> 6 & 0x3f]);
sb.append(base64EncodeChars[c & 0x3f]);
}
if (r == 1) {
c = 0x000000ff & data[i++];
sb.append(base64EncodeChars[c >> 2]);
sb.append(base64EncodeChars[(c & 0x03) << 4]);
sb.append("==");
}
else if (r == 2) {
c = (0x000000ff & data[i++]) << 8 |
(0x000000ff & data[i++]);
sb.append(base64EncodeChars[c >> 10]);
sb.append(base64EncodeChars[c >> 4 & 0x3f]);
sb.append(base64EncodeChars[(c & 0x0f) << 2]);
sb.append("=");
}
return sb.toString();
}
public final static byte[] decode(String str) {
byte[] data = str.getBytes();
int len = data.length;
ByteBufferStream buf = new ByteBufferStream(len);
int i = 0;
int b1, b2, b3, b4;
while (i < len) {
/* b1 */
do {
b1 = base64DecodeChars[data[i++]];
} while (i < len && b1 == -1);
if (b1 == -1) {
break;
}
/* b2 */
do {
b2 = base64DecodeChars[data[i++]];
} while (i < len && b2 == -1);
if (b2 == -1) {
break;
}
buf.write((b1 << 2) | ((b2 & 0x30) >>> 4));
/* b3 */
do {
b3 = data[i++];
if (b3 == 61) {
return buf.toArray();
}
b3 = base64DecodeChars[b3];
} while (i < len && b3 == -1);
if (b3 == -1) {
break;
}
buf.write(((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2));
/* b4 */
do {
b4 = data[i++];
if (b4 == 61) {
return buf.toArray();
}
b4 = base64DecodeChars[b4];
} while (i < len && b4 == -1);
if (b4 == -1) {
break;
}
buf.write(((b3 & 0x03) << 6) | b4);
}
return buf.toArray();
}
}