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From "Jens Geyer (JIRA)" <>
Subject [jira] [Updated] (THRIFT-4024) Skip() should throw on unknown data types
Date Tue, 10 Jan 2017 20:56:58 GMT


Jens Geyer updated THRIFT-4024:
    Summary: Skip() should throw on unknown data types  (was: C# deserialization takes unnecessary
time on list with unknown type of elements)

> Skip() should throw on unknown data types
> -----------------------------------------
>                 Key: THRIFT-4024
>                 URL:
>             Project: Thrift
>          Issue Type: Bug
>          Components: C# - Library
>    Affects Versions: 0.10.0
>            Reporter: Michael Antipin
>            Assignee: Jens Geyer
> I'm using TBinaryProtocol and a simple transport that reads from a given byte array.
> C# library contains the following code in TProtocolUtil.Skip(TProtocol prot, TType type):
> {code}
> case TType.List:
> 	TList list = prot.ReadListBegin();
> 	for (int i = 0; i < list.Count; i++) {
> 		Skip(prot, list.ElementType);
> 	}
> 	prot.ReadListEnd();
> 	break;
> {code}
> The type of elements is detected in ReadListBegin(), and, as Skip() does nothing for
unknown types, the position in the binary remains the same until the for loop completes. 
> So, when you try to deserialize invalid data, and a field type happens to be detected
as TType.List, you may end up waiting for a random period of time until deserialization is
completed (734707176 iterations of skipping in my case).
> I suggest throwing an exception immediately when list elements type is unknown. May be,
it would be good to have a setting like *FailOnUnknownType*, so that Skip() will throw instead
of ignoring.

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