Major Description
Got this backtrace below when trying to parse a PCAP 2.4 file.
This comes from the IPv4Checksum computation, which is a layer transformer defined as part of the EthernetIP DFDL schema.
The bug itself is reported against the ethernetIP schema here: https://github.com/DFDLSchemas/ethernetIP/issues/4
This ticket is about the fact that this bug appears to be a Daffodil bug, when it's really part of the schema.
This exception needs to be caught, so that it can be distinguished from a Daffodil bug. This bug is in the layer transformer, and the message should be clear about that, and point the user at the schema's layer transformer without the user having to interpret the backtrace.
It should say something like "Exception in layer transformer: %s" and hopefully capture the name of the layer transformer and include it as part of the message. The backtrace is still useful. It should just not be labeled as a Daffodil bug.
cat 'FOUO - BData.pcap' | daffodil parse -s ../../dataiti/git/dfdl-schemas/dfdl-pcap/src/main/resources/com/tresys/pcap/xsd/pcap.dfdl.xsd – !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !! An unexpected exception occurred. This is a bug! !! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Please report this bug and help us fix it: https://daffodil.apache.org/community/#issue-tracker Please include the following exception, the command you ran, and any input, schema, or tdml files used that led to this bug. org.apache.daffodil.exceptions.Abort: Invariant broken: checksumTotal.<=(65535).&&(checksumTotal.>=(0)) org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:137) com.owlcyberdefense.dfdl.IPv4Checksum.compute(IPv4Checksum.scala:74) com.owlcyberdefense.dfdl.IPv4Checksum.compute(IPv4Checksum.scala:35) org.apache.daffodil.layers.ByteBufferExplicitLengthLayerTransform.startLayerForParse(LayerTransformer.scala:361) at org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:137) at com.owlcyberdefense.dfdl.IPv4Checksum.compute(IPv4Checksum.scala:74) at com.owlcyberdefense.dfdl.IPv4Checksum.compute(IPv4Checksum.scala:35) at org.apache.daffodil.layers.ByteBufferExplicitLengthLayerTransform.startLayerForParse(LayerTransformer.scala:361) at org.apache.daffodil.processors.parsers.LayeredSequenceParser.parse(LayeredSequenceParser.scala:51) at org.apache.daffodil.processors.parsers.Parser.parse1(Parser.scala:82) at org.apache.daffodil.processors.parsers.Parser.parse1$(Parser.scala:76) at org.apache.daffodil.processors.parsers.CombinatorParser.parse1(Parser.scala:161) at org.apache.daffodil.processors.parsers.Unseparated.parseOne(UnseparatedSequenceParsers.scala:29)