Bit String Error

[Christopher.J.Demattio@xxxxxxxxxxx]

Hello,

 

I am using SNACC to encode a simple bit string whose maximum length is 4 bits.  If only bit zero is set (corresponding to a hex value of 0x80), the bit string encodes as:

 

0x03, 0x01, 0x80

 

In my understanding, I believe that it should encode as

 

0x03, 0x02, 0x07, 0x80

 

Is my understanding correct?  If so, I think there is a bug in the asn-bits.c module.  The offending code is located in BEncAsnBitsContent:

 

/* check for special DER encoding rules to return 03 01 00 not

03 02 07 00 RWC */

if (((bits->bits[0] != 0) || (byteLen > 1)) && (unusedBits != 7))

{

BufPutByteRvs (b, (unsigned char)unusedBits);

return byteLen + 1;

}

else

return byteLen;

 

While I can't comment on what the code is trying to avoid here, it looks to me like the "(unusedBits != 7)" check is erroneously keeping the code from writing out the number of unused bits for this case.

 

Can you please advise?

 

Regards,

 

Chris