[PROTON-2038] [Python] ubyte (and other unsigned types) can hold negative value

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: proton-c-0.27.1
• Fix Version/s: proton-c-0.28.0
• Component/s: python-binding
• Assignee: Kim van der Riet
• Reporter: Kim van der Riet
• Created: 02/May/19 11:38
• Updated: 10/May/19 17:15
• Resolved: 07/May/19 13:41

Description

Python representations of:

proton.ubyte
proton.ushort
proton.uint
proton.ulong

can hold a negative value, even though they should be unsigned.

import proton
print proton.ubyte(-1)
print proton.ushort(-1)
print proton.uint(-1)
print proton.ulong(-1)

results in

-1
-1
-1
-1

 If an unsigned type containing a negative value is used in a message in any context, it can cause an Overflow exception to be thrown within Proton.