github.com/waldiirawan/apm-agent-go/v2@v2.2.2/fnv.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  //
    18  // Based on Go's pkg/hash/fnv.
    19  //
    20  // Copyright 2011 The Go Authors. All rights reserved.
    21  // Use of this source code is governed by a BSD-style
    22  // license that can be found in the LICENSE file.
    23  
    24  package apm // import "github.com/waldiirawan/apm-agent-go/v2"
    25  
    26  const (
    27  	offset64 = 14695981039346656037
    28  	prime64  = 1099511628211
    29  )
    30  
    31  type fnv1a uint64
    32  
    33  func newFnv1a() fnv1a {
    34  	return offset64
    35  }
    36  
    37  func (f *fnv1a) add(s string) {
    38  	for i := 0; i < len(s); i++ {
    39  		*f ^= fnv1a(s[i])
    40  		*f *= prime64
    41  	}
    42  }