93 lines
4.1 KiB
Java
93 lines
4.1 KiB
Java
|
package com.osmand;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @source http://www.javaworld.com/javaworld/javatips/jw-javatip47.html -- 24.11.2008, (mb)
|
||
|
|
*/
|
||
|
|
public class Base64 {
|
||
|
|
/*******************************************************************************************************************
|
||
|
|
* BASE 64 encoding of a String or an array of bytes. See also RFC 1421.
|
||
|
|
*
|
||
|
|
* @author Unknown
|
||
|
|
* @author David W. Croft
|
||
|
|
* @version 1998-06-08
|
||
|
|
******************************************************************************************************************/
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
public static final char[] alphabet = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7
|
||
|
|
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15
|
||
|
|
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23
|
||
|
|
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31
|
||
|
|
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39
|
||
|
|
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47
|
||
|
|
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55
|
||
|
|
'4', '5', '6', '7', '8', '9', '+', '/' }; // 56 to 63
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
public static String encode(final String s)
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
{
|
||
|
|
return encode(s.getBytes());
|
||
|
|
}
|
||
|
|
|
||
|
|
public static String encode(final byte[] octetString)
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
{
|
||
|
|
int bits24;
|
||
|
|
int bits6;
|
||
|
|
|
||
|
|
final char[] out = new char[((octetString.length - 1) / 3 + 1) * 4];
|
||
|
|
|
||
|
|
int outIndex = 0;
|
||
|
|
int i = 0;
|
||
|
|
|
||
|
|
while ((i + 3) <= octetString.length) {
|
||
|
|
// store the octets
|
||
|
|
bits24 = (octetString[i++] & 0xFF) << 16;
|
||
|
|
bits24 |= (octetString[i++] & 0xFF) << 8;
|
||
|
|
bits24 |= (octetString[i++] & 0xFF) << 0;
|
||
|
|
|
||
|
|
bits6 = (bits24 & 0x00FC0000) >> 18;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x0003F000) >> 12;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x00000FC0) >> 6;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x0000003F);
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (octetString.length - i == 2) {
|
||
|
|
// store the octets
|
||
|
|
bits24 = (octetString[i] & 0xFF) << 16;
|
||
|
|
bits24 |= (octetString[i + 1] & 0xFF) << 8;
|
||
|
|
|
||
|
|
bits6 = (bits24 & 0x00FC0000) >> 18;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x0003F000) >> 12;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x00000FC0) >> 6;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
|
||
|
|
// padding
|
||
|
|
out[outIndex++] = '=';
|
||
|
|
} else if (octetString.length - i == 1) {
|
||
|
|
// store the octets
|
||
|
|
bits24 = (octetString[i] & 0xFF) << 16;
|
||
|
|
|
||
|
|
bits6 = (bits24 & 0x00FC0000) >> 18;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
bits6 = (bits24 & 0x0003F000) >> 12;
|
||
|
|
out[outIndex++] = alphabet[bits6];
|
||
|
|
|
||
|
|
// padding
|
||
|
|
out[outIndex++] = '=';
|
||
|
|
out[outIndex++] = '=';
|
||
|
|
}
|
||
|
|
|
||
|
|
return new String(out);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|