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path: root/parse/parse.go
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package main

import (
	"dim13.org/asn1/ber"
	"fmt"
	"log"
)

func Chop(b []byte) (h byte, l int, v []byte, r []byte) {
	if len(b) > 1 {
		h = b[0]
		l = int(b[1])
		if 2+l > len(b) {
			log.Fatal("lenght ", l, len(b))
		}
		v, r = b[2:2+l], b[2+l:]
	}
	return
}

// broken
func dump(b []byte, indent int) {
	head, _, value, rest := Chop(b)

	class, kind, tag := ber.Ident(head)
	for i := indent; i > 0; i-- {
		fmt.Print("\t")
	}

	switch class {
	case ber.Universal:
		switch tag {
		case ber.Integer:
			fmt.Println(tag, ber.UnmarshalInt(value))
		case ber.ObjectIdentifier:
			fmt.Println(tag, ber.UnmarshalOID(value))
		default:
			fmt.Println(tag, kind, value)
		}
	default:
		fmt.Println(class, kind, byte(tag), value)
	}

	if len(value) > 0 && kind != ber.Primitive {
		dump(value, indent+1)
	}

	if len(rest) > 0 {
		dump(rest, indent)
	}
}

func main() {
	for n, s := range session {
		fmt.Println("packet", n)
		dump(s, 0)
		fmt.Println("")
	}
}