Python OSITrace method get_messages_in_index_range() ignores arguments for *.osi format

[tpajenkamp-dspace]

Describe the bug

In the Python OSI Trace reader (format/OSITrace.py), when using the binary OSI trace format (type_name=None), the method get_messages_in_index_range(bening, end) ignores the arguments begin and end. Instead, it always returns an iterator over all messages. Because of that, the method get_message_by_index(index) always returns the first message regardless of the index argument.

Describe how to reproduce the bug

Steps to reproduce the behavior:

tr = OSITrace()
tr.from_file("MySensorViewTrace.osi")
l = list(tr.get_messages_in_index_range(10, 12))
m = tr.get_message_by_index(5)

l contains all message instead of messages 10, 11 and 12, m is message 0 instead if message 5.

Describe the expected behavior

l contains only the messages 10, 11 and 12 (or at least a documentation that it does not work as expected).

Describe the OS you are using

• OS: Windows 10
• Python 3.6.8 64-bit

Additional context

Possible fix:

1. In the "OSI"-branch of the method, replace self.scenario_file.seek(0) with self.scenario_file.seek(self.message_offsets[begin])
2. in the while loop condition, end with min(len(serialized_message), self.message_offsets[end+1]) (requires additional index range check for self.message_offsets)