| /* Get last byte of a range from offset + length. |
| * Undefined for ranges that wrap around 0. */ |
| static inline uint64_t range_get_last(uint64_t offset, uint64_t len) |
| /* Check whether a given range covers a given byte. */ |
| static inline int range_covers_byte(uint64_t offset, uint64_t len, |
| return offset <= byte && byte <= range_get_last(offset, len); |
| /* Check whether 2 given ranges overlap. |
| * Undefined if ranges that wrap around 0. */ |
| static inline int ranges_overlap(uint64_t first1, uint64_t len1, |
| uint64_t first2, uint64_t len2) |
| uint64_t last1 = range_get_last(first1, len1); |
| uint64_t last2 = range_get_last(first2, len2); |
| return !(last2 < first1 || last1 < first2); |