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a length of exactly 256 should be encoded as: 0x82 0x01 0x00 without this change, I was seeing the encoded length of a get response (that happened to be exactly 256 bytes long) encoded as: 0x81 0x00 that was causing snmpbulkwalk to fail, since it was reading the encoded length as 0.
…elds (SNMP version, error status / non-repeaters, error index / repeaters). add _knownLen to IntegerType: defaults to 4 (1 for ByteType), and is set to the decoded _length in fromBuffer(). this is then used in serialise(), where it selectively outputs extra bytes only when needed. with all that, the resultant outgoing packet will be at least 9 bytes shorter. for certain packets, it could be 10 bytes shorter, if the decrease by 9 forces a containing struct's length to drop from requiring 2 bytes to encode its length down to 1, etc. that is the case for the test packet returned by the test.cpp GenerateTestSNMPRequestPacket() function. it was generating a 133 byte packet, but now is only 123. update the unit tests to now use a const (const int expected_length = 123;) throughout.
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Fixes #61
add ByteType (derived from IntegerType), and use this for protocol fields (SNMP version, error status / non-repeaters, error index / repeaters).
add _knownLen to IntegerType: defaults to 4 (1 for ByteType), and is set to the decoded _length in fromBuffer().
this is then used in serialise(), where it selectively outputs extra bytes only when needed.
with all that, the resultant outgoing packet will be at least 9 bytes shorter.
for certain packets, it could be 10 bytes shorter, if the decrease by 9 forces a containing struct's length to drop from requiring 2 bytes to encode its length down to 1, etc.
that is the case for the test packet returned by the test.cpp GenerateTestSNMPRequestPacket() function.
it was generating a 133 byte packet, but now is only 123.
update the unit tests to now use a const (const int expected_length = 123;) throughout.