/
pdml.go
125 lines (100 loc) · 2.61 KB
/
pdml.go
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// Copyright 2019-2022 Graham Clark. All rights reserved. Use of this source
// code is governed by the MIT license that can be found in the LICENSE
// file.
package pcap
import (
"bytes"
"compress/gzip"
"encoding/gob"
"encoding/xml"
"io"
"github.com/mreiferson/go-snappystream"
)
//======================================================================
type IPdmlPacket interface {
Packet() PdmlPacket
}
type PdmlPacket struct {
XMLName xml.Name `xml:"packet"`
Content []byte `xml:",innerxml"`
}
var _ IPdmlPacket = PdmlPacket{}
func (p PdmlPacket) Packet() PdmlPacket {
return p
}
//======================================================================
type GzippedPdmlPacket struct {
Data bytes.Buffer
}
var _ IPdmlPacket = GzippedPdmlPacket{}
func (p GzippedPdmlPacket) Packet() PdmlPacket {
return p.Uncompress()
}
func (p GzippedPdmlPacket) Uncompress() PdmlPacket {
greader, err := gzip.NewReader(&p.Data)
if err != nil {
panic(err)
}
decoder := gob.NewDecoder(greader)
var res PdmlPacket
err = decoder.Decode(&res)
if err != nil {
panic(err)
}
return res
}
func GzipPdmlPacket(p PdmlPacket) IPdmlPacket {
res := GzippedPdmlPacket{}
gwriter := gzip.NewWriter(&res.Data)
encoder := gob.NewEncoder(gwriter)
err := encoder.Encode(p)
if err != nil {
panic(err)
}
gwriter.Close()
return res
}
//======================================================================
type SnappiedPdmlPacket struct {
Data bytes.Buffer
}
var _ IPdmlPacket = SnappiedPdmlPacket{}
func (p SnappiedPdmlPacket) Packet() PdmlPacket {
return p.Uncompress()
}
func (p SnappiedPdmlPacket) Uncompress() PdmlPacket {
var res PdmlPacket
UnsnappyMe(&res, &p.Data)
return res
}
func SnappyPdmlPacket(p PdmlPacket) IPdmlPacket {
res := SnappiedPdmlPacket{}
SnappyMe(p, &res.Data)
return res
}
//======================================================================
// SnappyMe compresses the object within interface p to the
// writer w.
func SnappyMe(p interface{}, w io.Writer) {
gwriter := snappystream.NewBufferedWriter(w)
encoder := gob.NewEncoder(gwriter)
if err := encoder.Encode(p); err != nil {
panic(err)
}
gwriter.Close()
}
// UnsnappyMe decompresses from reader r into res. Afterwards,
// res will be an interface whose type is a pointer to whatever
// was serialized in the first place.
func UnsnappyMe(res interface{}, r io.Reader) {
greader := snappystream.NewReader(r, false)
decoder := gob.NewDecoder(greader)
if err := decoder.Decode(res); err != nil {
panic(err)
}
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 78
// End: