Asn.1 Question

Behdad Forghani <>
Thu Jul 2 20:01:03 CEST 2009


Hi,

I compiled LTE ASN.1 S1-AP specification with asn1ct. When I try to 
decode a message, I get the error:
exception error: no match of right hand side value.

The line that produces the error is:
{Tmpterm1, Bytes3} = ?RT_PER:decode_open_type(Bytes2, [])

It seems to me the decoder is calling decode_open_type and passing an 
empty list as the second parameter.
Tmpterm1, Bytes3 and Bytes2 are unbound. Is my analysis correct? Sorry, 
I am very new to Erlang.
Is this a bug in Asn.1 compiler?
Is this the correct forum to ask this question?
I really appreciate if any help you can give me. I am just getting my 
feet wet on Erlang.

I am using OTP R13B01.
The detailed error is:

 ** exception error: no match of right hand side value
                    
<<0,0,3,0,8,0,3,0,0,0,0,67,0,6,5,37,245,64,0,1,0,26,0,12,
                      11>>
     in function  asn1rt_per_bin:getoctets_as_bin/2
     in call from 'S1AP-PDU-Descriptions':dec_InitiatingMessage/2
        called as 'S1AP-PDU-Descriptions':dec_InitiatingMessage({3,
                                                                 
<<0,12,64,36,
                                                                   
0,0,3,0,8,
                                                                   
0,3,0,0,0,
                                                                   
0,67,0,6,5,
                                                                   
37,245,64,
                                                                   0,1,0,26,
                                                                   ...>>},
                                                                telltype)
     in call from 'S1AP-PDU-Descriptions':'dec_S1AP-PDU'/2
     in call from 'S1AP-PDU-Descriptions':decode_disp/2

    
The function is:
dec_InitiatingMessage'(Bytes,_) ->

%%  attribute number 1 with type procedureCode
{Term1,Bytes1} = ?RT_PER:decode_integer(Bytes,[{'ValueRange',{0,255}}]),

%%  attribute number 2 with type criticality
{Term2,Bytes2} = 
?RT_PER:decode_enumerated(Bytes1,[{'ValueRange',{0,2}}],{reject,ignore,notify}),

%%  attribute number 3 with type InitiatingMessage
{Tmpterm1, Bytes3} = ?RT_PER:decode_open_type(Bytes2, []),


Regards,
Behdad


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