Encode Integer Delta

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1

Imported from previous forum

2

I have a question regarding encoding of Integer Delta.
Lets consider the following field:
Base Value = 0;
Actual Value = 18446744073709551615 (UInt64 max value)
Field Type = UInt64
Operator = Delta

The integer delta is encoded as a signed integer (refer 10.7.1). Here, the detla value (18446744073709551615) is same as the actual value which cannot be represented as a signed integer. How do I encode such values?

Let me know if I am missing anything here.

Regards
Kiran

3

The spec doesn’t limit the delta to 64-bits. This note is from 6.3.7.1 in the spec

“NOTE: The size of the integer required for the delta may be larger than the specified size for the field type. For example, if a field of type uInt32 has the base 4294967295 and the new value is 17 an int64 is required to represent the delta -4294967278. However, this does not affect how the delta appears in the stream.”

In your example you’d need a 65-bit entity value to encode the delta.

/David

I have a question regarding encoding of Integer Delta. Lets consider the
following field: Base Value = 0; Actual Value = 18446744073709551615
(UInt64 max value) Field Type = UInt64 Operator = Delta

The integer delta is encoded as a signed integer (refer 10.7.1). Here,
the detla value (18446744073709551615) is same as the actual value which
cannot be represented as a signed integer. How do I encode such values?

Let me know if I am missing anything here.

Regards Kiran