You could use the ExecuteScript processor if you are comfortable with Groovy, Javascript, Jython, JRuby, or Lua. Here's an example of a Groovy script that I think will do what you're asking: import java.io.DataInputStream
def flowFile = session.get()
if(!flowFile) return
def attr = ''
session.read(flowFile, {inputStream ->
dis = new DataInputStream(inputStream)
attr = Integer.toHexString(dis.readUnsignedShort())
} as InputStreamCallback)
flowFile = session.putAttribute(flowFile, 'first16hex', attr)
session.transfer(flowFile, REL_SUCCESS) This maintains the content in the flow file but adds an attribute called 'first16hex' that contains a string representation of the first 16 bits of the incoming flow file content. Please let me know if I've misunderstood anything here, and I will try to help. I should mention that a full hexdump processor could be helpful, feel free to raise a Jira for this feature.
... View more
