Base64 Construe!
aaaaaaaa | bbbbbbbb | cccccccc | | dddddddd | | ffffffff | 3byte to 4byte is Encode00aaaaaa | 00aabbbb | 00bbbbcc | 00cccccc | 3byte NewLen = 400aaaaaa | 00aabbbb | 00bbbbcc | 00cccccc | | 00dddddd | 00dd0000 | 4byte NewLen = 600aaaaaa | 00aabbbb | 00bbbbcc | 00cccccc | | 00DDDDDD | 00DDFFFF | 0000FFFF | 5Byte Newlen = 7
IF Oldlen 3> 0 Then newlen = Oldlen Trunc 3 * 4 Oldlen MOD 3 1ELSE NELEN = Oldlen / 3 * 4
