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hash.go
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hash.go
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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
package flow
import (
"encoding/binary"
"hash"
"strings"
)
func (fl *ICMPLayer) Hash(hasher hash.Hash) {
if fl == nil {
return
}
value32 := make([]byte, 4)
binary.BigEndian.PutUint32(value32, uint32(fl.Type)<<24|uint32(fl.Code<<16|uint32(fl.ID)))
hasher.Write(value32)
}
// Hash calculates a unique symetric flow layer hash
func (fl *FlowLayer) Hash(hasher hash.Hash) {
if fl == nil {
return
}
if strings.Compare(fl.A, fl.B) > 0 {
hasher.Write([]byte(fl.A))
hasher.Write([]byte(fl.B))
} else {
hasher.Write([]byte(fl.B))
hasher.Write([]byte(fl.A))
}
value64 := make([]byte, 8)
binary.BigEndian.PutUint64(value64, uint64(fl.ID))
hasher.Write(value64)
}