[Nexus-developers] Support for 64 bit ints

[Akeroyd, FA (Freddie)]

I think mxml should be OK as everything is treated as a string and "data
types" have been added by us. 

With regard to HDF4 the API could detect a request for an int64 and
write an array of two int32 instead - this would not be "standard hdf4"
but would allow the use of uint64 on an HDF4 platform. However it is
probably not necessary in the first instance.

Freddie

-----Original Message-----
From: nexus-developers-bounces at nexusformat.org
[mailto:nexus-developers-bounces at nexusformat.org] On Behalf Of Peterson,
Peter F.
Sent: 15 August 2007 20:12
To: NeXus Developers
Subject: [Nexus-developers] Support for 64 bit ints

We are actively developing code to create event based NeXus files
according to the approved definition
<http://www.nexusformat.org/NXevent_data>. A limitation that we have run
into is that NAPI only supports up to uint32. With our current scheme
for generating the pulse-time (nanosecond resolution) this allows for
event lists that take place over < 4 seconds.

A solution to this problem is to add support in NAPI for UINT64. I do
not know the feasibility in mxml, but I spoke with Elena Pourmal on the
topic for feasibility in HDF4/HDF5. HDF5 can, HDF4 can't. Is the dev
group willing to add the functionality to the API, and generate errors
if it is tried with XML/HDF4?

P^2

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