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Re: little and big endian -- once more [message #15329]

Thu, 13 May 1999 00:00

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi,

Martin Schultz wrote:
>
> Hi all,
>
> took me a while to realize that it is the machine architecture not
> the OS that determines the byte swapping -- in fact I needed to have IDL
> on linux (after using it on an SGI and with Windows) to figure that out
> ... Anyway, I now devised the following test for byte swapping which is
> applied in my open_file routine and handles everything transparently.

I'm not sure if I'm missing some subtlety here, but wouldn't the (newish)
keywords /SWAP_IF_[BIG|LITTLE]_ENDIAN to IDL's OPEN and BYTEORDER routines
work in all cases? I've used them to good effect for cross-platform work.

From the help file:

[...] it only takes effect if the current system has [big|little] endian
byte ordering. This keyword does not refer to the byte ordering of the input
data, but to the computer hardware.

Cheers,
--
-Dick

Dick Jackson Fanning Software Consulting, Canadian Office
djackson@dfanning.com Calgary, Alberta Voice/Fax: (403) 242-7398
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: little and big endian -- once more By: Dick Jackson on Thu, 13 May 1999 00:00
		Re: little and big endian -- once more By: Liam Gumley on Thu, 13 May 1999 00:00
		Re: little and big endian -- once more By: Martin Schultz on Wed, 12 May 1999 00:00
		Re: little and big endian -- once more By: Liam Gumley on Wed, 12 May 1999 00:00
		Re: little and big endian -- once more By: davidf on Wed, 12 May 1999 00:00

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