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Re: Q: IDL and endianness issues [message #19723 is a reply to message #19720]

Tue, 11 April 2000 00:00

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Ossi Vaananen wrote:
>
> Hi!
>
> Let's say I have a binary file with known structure, and
> the file is written on a little-endian machine. Then I want
> to read it again on a big-endian machine. How do I do it?
>
> If endianness was no problem, I could do this simply by
> creating a structure with contents that match the alignment
> of the different data types in the binary file, and then
> read data to it from the file with READU.
>
> In Matlab, files can be opened with the endianness of the
> file explicitly given as an argument to fopen. In IDL manuals
> I saw no reference to such a feature in IDL.
>
> The question is, does there exist a built-in feature in IDL
> that somehow allows endianness-specified file I/O?
>

Take a look at byteorder() or swap_endian(). For best results, use the nasa
routines ieee_to_host and host_to_ieee.

Good luck,

JD

--
J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
304 Space Sciences Bldg. |*| FAX: (607) 255-5875
Ithaca, NY 14853 |*|

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[Message index]

		Re: Q: IDL and endianness issues By: Nando Iavarone on Thu, 13 April 2000 00:00
		Re: Q: IDL and endianness issues By: Liam E. Gumley on Tue, 11 April 2000 00:00
		Re: Q: IDL and endianness issues By: Paul van Delst on Tue, 11 April 2000 00:00
		Re: Q: IDL and endianness issues By: Ed Santiago on Tue, 11 April 2000 00:00
		Re: Q: IDL and endianness issues By: John-David T. Smith on Tue, 11 April 2000 00:00

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