[Psidev-ms-dev] Spectra with length 0 in mzData files

[simon a. \(BI\) <sim...@bb...>]

I'm writing a viewer for mzData files and have come across a small
problem where I'm not sure if it's me or the data files which are wrong.

I'm decoding the Base64 data in the spectra and am using the myo_ms2.xml
file from sourceforge as an example.  However my parser is falling over
on the following lines:

<mzArrayBinary>
	<data precision=3D"32" endian=3D"little" =
length=3D"0">AAAAAA=3D=3D</data>
</mzArrayBinary>
<intenArrayBinary>
	<data precision=3D"32" endian=3D"little" =
length=3D"0">AAAAAA=3D=3D</data>
</intenArrayBinary>

In these cases the file specifies a length of 0, despite there being 1
value in the entry (albeit 0 and 0).  Is this the correct way of
denoting an empty spectrum, or should this file really quote a length of
1?

Also whilst I'm asking - can anyone point me to a reference for the
correct way to handle 64 bit precision data on a 32bit machine and vice
versa?  I'm kind of new to a lot of this low level binary stuff!

Cheers

Simon.

--=20
Simon Andrews PhD
Bioinformatics Dept
The Babraham Institute

sim...@bb...
+44 (0)1223 496463
=20