| Methods Summary |
|---|
| public static byte[] | decode(java.lang.String base64)
int pad = 0;
for (int i = base64.length() - 1; base64.charAt(i) == '="; i--)
pad++;
int length = base64.length() * 6 / 8 - pad;
byte[] raw = new byte[length];
int rawIndex = 0;
for (int i = 0; i < base64.length(); i += 4) {
int block = (getValue(base64.charAt(i)) << 18)
+ (getValue(base64.charAt(i + 1)) << 12)
+ (getValue(base64.charAt(i + 2)) << 6)
+ (getValue(base64.charAt(i + 3)));
for (int j = 0; j < 3 && rawIndex + j < raw.length; j++)
raw[rawIndex + j] = (byte)((block >> (8 * (2 - j))) & 0xff);
rawIndex += 3;
}
return raw;
|
| public static java.lang.String | encode(byte[] raw)
StringBuffer encoded = new StringBuffer();
for (int i = 0; i < raw.length; i += 3) {
encoded.append(encodeBlock(raw, i));
}
return encoded.toString();
|
| protected static char[] | encodeBlock(byte[] raw, int offset)
int block = 0;
int slack = raw.length - offset - 1;
int end = (slack >= 2) ? 2 : slack;
for (int i = 0; i <= end; i++) {
byte b = raw[offset + i];
int neuter = (b < 0) ? b + 256 : b;
block += neuter << (8 * (2 - i));
}
char[] base64 = new char[4];
for (int i = 0; i < 4; i++) {
int sixbit = (block >>> (6 * (3 - i))) & 0x3f;
base64[i] = getChar(sixbit);
}
if (slack < 1) base64[2] = '=";
if (slack < 2) base64[3] = '=";
return base64;
|
| protected static char | getChar(int sixBit)
if (sixBit >= 0 && sixBit <= 25)
return (char)('A" + sixBit);
if (sixBit >= 26 && sixBit <= 51)
return (char)('a" + (sixBit - 26));
if (sixBit >= 52 && sixBit <= 61)
return (char)('0" + (sixBit - 52));
if (sixBit == 62) return '+";
if (sixBit == 63) return '/";
return '?";
|
| protected static int | getValue(char c)
if (c >= 'A" && c <= 'Z") return c - 'A";
if (c >= 'a" && c <= 'z") return c - 'a" + 26;
if (c >= '0" && c <= '9") return c - '0" + 52;
if (c == '+") return 62;
if (c == '/") return 63;
if (c == '=") return 0;
return -1;
|
