29 lines
604 B
Go
29 lines
604 B
Go
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
|
|
}
|