Hi,
I have the following data type, which is encoded using BER.
Component ::= CHOICE {
invoke [1] IMPLICIT Invoke,
returnResultLast [2] IMPLICIT ReturnResult,
returnError [3] IMPLICIT ReturnError,
reject [4] IMPLICIT Reject,
returnResultNotLast [7] IMPLICIT ReturnResult
}
ReturnResult ::= SEQUENCE {
invokeID INTEGER (-128..127),
result SEQUENCE {
operationCode CHOICE {
localValue INTEGER,
globalValue OBJECT IDENTIFIER
},
parameter OCTET STRING (SIZE(1..255))
} OPTIONAL
}
I recieved the following byte stream as the encoding for this structure.
0xa2 0x0d 0x02 0x01 0x00 0x30 0x06 0x02 0x01 0x0e 0x80 0x01 0x04 0x00 0x00
This can be decoded as:
0xa2: Tag for ReturnResult structure within Component (CNTX, CONS, 2)
0x0d: Length of the contents = 13 bytes
0x02: Integer tag (for invokeID)
0x01: Length of the contents = 1 byte
0x00: Value of invokeID = 0
0x30: Sequence tag (for result)
0x06: Length of the contents = 6 bytes
0x02: Integer tag (for localValue)
0x01: Length of the contents = 1 byte
0x0e: Value of localValue = 0x0e
Assumed tag (UNIV, PRIM, OCTETSTRING_TAG_CODE) and length of
6 - 3 = 3 bytes
0x80: parameter[0]
0x01: parameter[1]
0x04: parameter[2]
0x00: ????
0x00: ????
As you can see, there are the 2 bytes of value 0 each left over. I
wanted to know if this is a valid byte stream since my decode code gives
an error when it reaches these 0.
In this case, it is probably manageable since these extraneous bytes are
coming at the end of the byte stream. But could I get a byte stream that
contains such not-needed bytes in the middle of the byte stream ?
Some light on what to do would be much appreciated.
Regds,
Divya
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