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