| package prometheus |
| |
| // Inline and byte-free variant of hash/fnv's fnv64a. |
| |
| const ( |
| offset64 = 14695981039346656037 |
| prime64 = 1099511628211 |
| ) |
| |
| // hashNew initializies a new fnv64a hash value. |
| func hashNew() uint64 { |
| return offset64 |
| } |
| |
| // hashAdd adds a string to a fnv64a hash value, returning the updated hash. |
| func hashAdd(h uint64, s string) uint64 { |
| for i := 0; i < len(s); i++ { |
| h ^= uint64(s[i]) |
| h *= prime64 |
| } |
| return h |
| } |
| |
| // hashAddByte adds a byte to a fnv64a hash value, returning the updated hash. |
| func hashAddByte(h uint64, b byte) uint64 { |
| h ^= uint64(b) |
| h *= prime64 |
| return h |
| } |