Store a reverse-encoded variable length field, representing the length * of the previous element of size 'l', in the target buffer 'buf'. * The function returns the number of bytes used to encode it, from * 1 to 5. If 'buf' is NULL the function just returns the number of bytes * needed in order to encode the backlen. */
| 326 | * 1 to 5. If 'buf' is NULL the function just returns the number of bytes |
| 327 | * needed in order to encode the backlen. */ |
| 328 | unsigned long lpEncodeBacklen(unsigned char *buf, uint64_t l) { |
| 329 | if (l <= 127) { |
| 330 | if (buf) buf[0] = l; |
| 331 | return 1; |
| 332 | } else if (l < 16383) { |
| 333 | if (buf) { |
| 334 | buf[0] = l>>7; |
| 335 | buf[1] = (l&127)|128; |
| 336 | } |
| 337 | return 2; |
| 338 | } else if (l < 2097151) { |
| 339 | if (buf) { |
| 340 | buf[0] = l>>14; |
| 341 | buf[1] = ((l>>7)&127)|128; |
| 342 | buf[2] = (l&127)|128; |
| 343 | } |
| 344 | return 3; |
| 345 | } else if (l < 268435455) { |
| 346 | if (buf) { |
| 347 | buf[0] = l>>21; |
| 348 | buf[1] = ((l>>14)&127)|128; |
| 349 | buf[2] = ((l>>7)&127)|128; |
| 350 | buf[3] = (l&127)|128; |
| 351 | } |
| 352 | return 4; |
| 353 | } else { |
| 354 | if (buf) { |
| 355 | buf[0] = l>>28; |
| 356 | buf[1] = ((l>>21)&127)|128; |
| 357 | buf[2] = ((l>>14)&127)|128; |
| 358 | buf[3] = ((l>>7)&127)|128; |
| 359 | buf[4] = (l&127)|128; |
| 360 | } |
| 361 | return 5; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /* Decode the backlen and returns it. If the encoding looks invalid (more than |
| 366 | * 5 bytes are used), UINT64_MAX is returned to report the problem. */ |
no outgoing calls
no test coverage detected