Re: [Jython-users] Implicit byte swap on array.fromfile()?

[Arlindo da S. <da...@al...>]

All,
  I just realized that on both Mac OS X 8.5/Intel and Linux/Ubuntu 8.04 I
 always get os.byteorder='big' with Jython, while CPython gives me
os.byteorder='little' as expected.  This is probably a reflection of the
fact that the JVM is big-endian regardless of the endianess of the
underlying hardware. This could explain the automatic byteswapping in my
original posting. Can someone confirm this?

  Arlindo


On Thu, Jun 19, 2008 at 2:12 PM, Arlindo da Silva <da...@al...>
wrote:

> All,
>
>   I'm porting some scripts from CPython to Jython and I am running into
> some I/O issue that perhaps someone could clarify whether this is a bug or a
> feature of jython v2.2.1. Basically, I am loading some floats from a binary
> stream into an array. Something like,
>
> import array
> a = array.array('f')
> a.fromfile(Reader,10)
>
> where Reader is actually the stdout of a C program captured with popen2():
>
> Reader, Writer = popen2(cmdline,bufsize=0)
>
> On CPython 2.5 I get the values as expected. Under jython, the numbers are
> byte swapped, that is, a.byteswap() produce the correct values. It appears
> that somewhere along jython is assuming that the Reader stream is in network
> byte order and doing the swap for me.  Not surprisingly, I have no problem
> getting strings from Reader.
>
> Is there a way for me to disable this automatic byte swap when reading
> floats?
>
>    Thank you,
>
>          Arlindo
>
> --
> Arlindo da Silva
> da...@al...




-- 
Arlindo da Silva
da...@al...