170   u_char input[3];  in b64_ntop()  local
174   input[0] = input[1] = input[2] = '\0';  in b64_ntop()
176     input[0] = *src++;  in b64_ntop()
177     input[1] = *src++;  in b64_ntop()
178     input[2] = *src++;  in b64_ntop()
181     output[0] = input[0] >> 2;  in b64_ntop()
182     output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);  in b64_ntop()
183     output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);  in b64_ntop()
184     output[3] = input[2] & 0x3f;  in b64_ntop()
201     input[0] = input[1] = input[2] = '\0';  in b64_ntop()
203       input[i] = *src++;  in b64_ntop()
205     output[0] = input[0] >> 2;  in b64_ntop()
206     output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);  in b64_ntop()
207     output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);  in b64_ntop()