Java Utililty Methods Base64 Decode

int len = str.length();
if ((len & 3) != 0)
    throw new IllegalArgumentException("Not Base64: " + str);
int padstart = str.indexOf('=', len - 3);
int padding = padstart == -1 ? 0 : len - padstart;
byte[] utf8 = new byte[len / 4 * 3];
for (int i = 0; i < len / 4; i++) {
    int value = (revBase64[str.charAt(4 * i)] << 18) + (revBase64[str.charAt(4 * i + 1)] << 12)
...

string = string.replace("\n", "");
string = string.replace("\r", "");
char[] chars = string.toCharArray();
int i = 0;
int charsToWrite = chars.length;
ByteArrayOutputStream buff = new ByteArrayOutputStream(chars.length);
byte[] b = new byte[4];
while (charsToWrite >= 4) {
...

int len = string.length();
int iter = len - (len % 4);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int i = 0;
for (; i < iter; i += 4) {
    byte a = b64reverseTable[string.charAt(i)];
    byte b = b64reverseTable[string.charAt(i + 1)];
    byte c = b64reverseTable[string.charAt(i + 2)];
...

BASE64Decoder base64de = new BASE64Decoder();
try {
    return new String(base64de.decodeBuffer(strMi));
} catch (IOException e) {
    e.printStackTrace();
    System.err.println("Cannot decode " + strMi);
    return "";

try {
    return new String(dec.decodeBuffer(text), DEFAULT_ENCODING);
} catch (IOException e) {
    return null;

byte[] buf = null;
if (txt != null && txt.length() > 0) {
    try {
        buf = new sun.misc.BASE64Decoder().decodeBuffer(txt);
    } catch (IOException ex) {
return buf;
...

if (src == null || src.length == 0)
    return null;
char[] four = new char[4];
int i = 0, l, aux;
char c;
boolean padded;
ByteArrayOutputStream dst = new ByteArrayOutputStream(src.length >> 1);
while (start < src.length) {
...

if (inputString == null)
    return "";
return new String(Base64.getDecoder().decode(inputString));

return Base64Decode(base64);

if (base64Code == null) {
    return null;
try {
    return new sun.misc.BASE64Decoder().decodeBuffer(base64Code);
} catch (IOException exception) {
    return null;