/**
* Decodes a byte[] containing containing characters in the Base64 alphabet.
*
* @param pArray A byte array containing Base64 character data
* @return a byte array containing binary data
*/
public byte[] decode(final byte[] pArray) {
reset();
if ((pArray == null) || (pArray.length == 0)) {
return pArray;
}
long len = Math.max(1, (pArray.length * 3) / 4);
byte[] buf = new byte[(int) len];
setInitialBuffer(buf, 0, buf.length);
decode(pArray, 0, pArray.length);
decode(pArray, 0, -1); // Notify decoder of EOF.
// Would be nice to just return buf (like we sometimes do in the encode
// logic), but we have no idea what the line-length was (could even be
// variable). So we cannot determine ahead of time exactly how big an
// array is necessary. Hence the need to construct a 2nd byte array to
// hold the final result:
byte[] result = new byte[pos];
readResults(result, 0, result.length);
return result;
}
/**
* Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64
* alphabet.
*
* @param pArray a byte array containing binary data
* @return A byte array containing only Base64 character data
*/
public byte[] encode(final byte[] pArray) {
reset();
if ((pArray == null) || (pArray.length == 0)) {
return pArray;
}
long len = getEncodeLength(pArray, lineLength, lineSeparator);
byte[] buf = new byte[(int) len];
setInitialBuffer(buf, 0, buf.length);
encode(pArray, 0, pArray.length);
encode(pArray, 0, -1); // Notify encoder of EOF.
// Encoder might have resized, even though it was unnecessary.
if (buffer != buf) {
readResults(buf, 0, buf.length);
}
// In URL-SAFE mode we skip the padding characters, so sometimes our
// final length is a bit smaller.
if (isUrlSafe() && (pos < buf.length)) {
byte[] smallerBuf = new byte[pos];
System.arraycopy(buf, 0, smallerBuf, 0, pos);
buf = smallerBuf;
}
return buf;
}