/// <summary>
/// Base64-encode the given data and return a newly allocated
/// byte[] with the result.
/// </summary>
/// <param name="input"> the data to encode </param>
/// <param name="offset"> the position within the input array at which to
/// start </param>
/// <param name="len"> the number of bytes of input to encode </param>
/// <param name="flags"> controls certain features of the encoded output.
/// Passing {@code DEFAULT} results in output that
/// adheres to RFC 2045. </param>
public static byte[] encode(byte[] input, int offset, int len, int flags)
{
Encoder encoder = new Encoder(flags, null);
// Compute the exact length of the array we will produce.
int output_len = len / 3 * 4;
// Account for the tail of the data and the padding bytes, if any.
if (encoder.do_padding)
{
if (len % 3 > 0)
{
output_len += 4;
}
}
else
{
switch (len % 3)
{
case 0:
break;
case 1:
output_len += 2;
break;
case 2:
output_len += 3;
break;
}
}
// Account for the newlines, if any.
if (encoder.do_newline && len > 0)
{
output_len += (((len - 1) / (3 * Encoder.LINE_GROUPS)) + 1) * (encoder.do_cr ? 2 : 1);
}
encoder.output = new byte[output_len];
encoder.process(input, offset, len, true);
Debug.Assert(encoder.op == output_len);
return encoder.output;
}