RE: [ASN.1] Decoding of TAP file

[Bin Zhu]

Somebody tell me please why "[ APPLICATION 169 ]" here is not encoded?
Is it supposed to like this?
 
Thanks,
Bin 

        -----Original Message-----
        From: Sergio da Silva [mailto:[EMAIL PROTECTED]] 
        Sent: Tuesday, March 19, 2002 7:08 AM
        To: [EMAIL PROTECTED]
        Cc: [EMAIL PROTECTED]
        Subject: Re: [ASN.1] Decoding of TAP file
        
        
        Hi, 

        Here's the binary view of your file supposedly encoded using
BER: 

        01100100 Tag Class = "Application" - Tag Form = "Constructed" -
Tag Number = 4 
        01111001 Short Definite Length with 121 octets for Value 

            01011111 Tag Class = "Application" - Tag Form = "Primitive" 
                     Tag Number encoded using following octets (this is
indicated with 11111) 
            10000001 Tag Number = 00000011000100 (bin) 
            01000100 Tag Number = 196 (dec) 
            00000101 Short Definite length with 5 octets for Value 
            01001001 ASCII(73) = "I" 
            01001110 ASCII(78) = "N" 
            01000100 ASCII(68) = "D" 
            01000001 ASCII(65) = "A" 
            01000011 ASCII(67) = "C" 

            01011111 Tag Class = "Application" - Tag Form = "Primitive" 
                     Tag Number encoded using following octets 
            10000001 Tag Number = 00000010110110 (bin) 
            00110110 Tag Number = 182 (dec) 
            00000101 Short Definite length with 5 octets for Value 
            01001001 ASCII(73) = "I" 
            01001110 ASCII(78) = "N" 
            01000100 ASCII(68) = "D" 
            01010010 ASCII(82) = "R" 
            01010010 ASCII(82) = "R" 

        For a better understanding of how BER encoding/decoding works
please have a look at some freely available books in PDF format that you
may find at www.oss.com. Have a look at chapter 18 from Olivier
Dubuisson's book. 

        Best regards, 

        Sergio da Silva 
          

        "devaraj[IT]" wrote: 

                Dear All, 

                        I am trying to decode a TAP file,but I am
confused.Following is the 
                one which I am trying.Please tell me how it was
encoded.Thanks in advance. 

                Value 

                        64 79 5F 81 44 05 49 4E 44 41 43 5F 81 36 05 49
4E 44 52 43 

                Definition 

                        BatchControlInfo : : = [ APPLICATION 4 ]
SEQUENCE 
                        { 
                                sender                  Sender 
                                recipient               Recipient 
                                . 
                                . 
                                . 

                        } 

                        Sender     : : = [ APPLICATION 196 ] PlmnId 

                        Recipient  : : = [ APPLICATION 182 ] PlmnId 

                        PlmnId     : : = [ APPLICATION 169 ]
VisibleString (SIZE(5)) 

                regards, 

                KB Devaraj - Information Technology 
                RPG Cellular Services Ltd 
                Chennai,India