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router: optimize computeProcID (#4520)
Fixes #4519
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@@ -5,6 +5,7 @@ go_library( | |
srcs = [ | ||
"connector.go", | ||
"dataplane.go", | ||
"fnv1aCheap.go", | ||
"metrics.go", | ||
"svc.go", | ||
], | ||
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@@ -0,0 +1,29 @@ | ||
// Copyright 2024 SCION Association | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package router | ||
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// fnv1aOffset32 is an initial offset that can be used as initial state when calling | ||
// hashFNV1a. | ||
const fnv1aOffset32 uint32 = 2166136261 | ||
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// hashFNV1a returns a hash value for the given initial state combined with the given byte. | ||
// To get a hash for a sequence of bytes, invoke for each byte, passing the returned value | ||
// of one call as the state for the next. Example. s1 = hashFNV1a(fnv1aOffset, byte1) | ||
// s2 = hashFNV1a(s1, byte2) etc. It is valid and recommended to use a value obtained | ||
// from calla to hashFNV1a() as the initial state rather than fnv1aOffset32 itself. | ||
func hashFNV1a(state uint32, c byte) uint32 { | ||
const prime32 = 16777619 | ||
return (state ^ uint32(c)) * prime32 | ||
} |