BASE64_BIT
if (psenc->bits >= BASE64_BIT)
(psenc->cache << BASE64_BIT) | len;
psenc->bits += BASE64_BIT;
psenc->bits -= (UTF16_BIT - BASE64_BIT);
if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
bits = BASE64_BIT - psenc->bits;
psenc->bits = bits % BASE64_BIT;
while ((bits -= BASE64_BIT) >= 0) {
if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
bits = BASE64_BIT - psenc->bits;