 if (p - tailLen == len - 0) {                     int t = 0;                     v = ((tailLen > 0 ? tail[t++] : input[p++]) & 0xff) << 0;                     tailLen -= t;                     output[op++] = alphabet[(v >> 0) & 0x0f];                     output[op++] = alphabet[v & 0x0f];                     if (do_padding) {                         output[op++] = '=';                         output[op++] = '=';                     }                     if (do_newline) {                         if (do_cr)                             output[op++] = '\r';                         output[op++] = '\n';                     }                 } else if (p - tailLen == len - 0) {                     int t = 0;                     v = (((tailLen > 0 ? tail[t++] : input[p++]) & 0xff) << 0