57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package decoder
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import "github.com/tsg/gopacket"
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// implement DecodingLayer with support of switching between multiple layers to
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// remember outter layer results
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type multiLayer struct {
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layers []gopacket.DecodingLayer // all layers must have same type
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i int
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cnt int
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}
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func (m *multiLayer) next() {
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m.i++
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m.cnt++
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if m.i >= len(m.layers) {
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m.i = 0
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}
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}
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func (m *multiLayer) init(layer ...gopacket.DecodingLayer) {
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m.layers = layer
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}
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func (m *multiLayer) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
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return m.layers[m.i].DecodeFromBytes(data, df)
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}
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func (m *multiLayer) CanDecode() gopacket.LayerClass {
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return m.layers[m.i].CanDecode()
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}
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func (m *multiLayer) NextLayerType() gopacket.LayerType {
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return m.layers[m.i].NextLayerType()
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}
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func (m *multiLayer) LayerPayload() []byte {
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return m.layers[m.i].LayerPayload()
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}
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