Re: Big Endian Byte Ordering

From: Doron Holan [MS] (doronh_at_nospam.microsoft.com)
Date: 01/08/05 

Date: Fri, 7 Jan 2005 20:28:39 -0800

If this is a network protocol structure, pay special attention to Scott's
advice about packing. if you need strict absolute field offsets from the
start of the structure, you will need probably set the packing level to 1.

d 

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"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message 
news:O03eBXS9EHA.1260@TK2MSFTNGP12.phx.gbl...
> Jonathan Wood wrote:
>> I have a question about big-endian byte ordering.
>>
>> I know that with, for example, a WORD value, big endian byte ordering 
>> puts
>> the two bytes in the reverse order that little endian does, which is used 
>> by
>> Intel processors.
>>
>> What I don't know is what happens in the case of structures. For example, 
>> I
>> know each member in the structure has its bytes reversed. But are all 
>> bytes
>> of the structure reversed?
>>
>> I'm trying to figure out how to convert a structure data type fo big 
>> endian
>> and I don't know if I can simply reverse all the bytes, or if I need to 
>> do
>> something more complicated like just reverse the bytes of each member.
>>
>> Thanks for any tips!
>>
>
> The endian-ness affects individual members only and is determined by the 
> CPU.  Structure packing and arrangement is determined by the compiler.
>
> -- 
> Scott McPhillips [VC++ MVP]
>

Relevant Pages

  • Re: Big Endian Byte Ordering
    ... could be used for network protocols, but my users will be able to specify ... >>> I know that with, for example, a WORD value, big endian byte ordering ... >>> and I don't know if I can simply reverse all the bytes, ... >>> something more complicated like just reverse the bytes of each member. ...
    (microsoft.public.vc.mfc)
  • Re: Big Endian Byte Ordering
    ... could be used for network protocols, but my users will be able to specify ... >>> I know that with, for example, a WORD value, big endian byte ordering ... >>> and I don't know if I can simply reverse all the bytes, ... >>> something more complicated like just reverse the bytes of each member. ...
    (microsoft.public.win32.programmer.kernel)
  • Re: Big Endian Byte Ordering
    ... could be used for network protocols, but my users will be able to specify ... >>> I know that with, for example, a WORD value, big endian byte ordering ... >>> and I don't know if I can simply reverse all the bytes, ... >>> something more complicated like just reverse the bytes of each member. ...
    (microsoft.public.win32.programmer.gdi)
  • Re: Big Endian Byte Ordering
    ... you will need probably set the packing level to 1. ... >> the two bytes in the reverse order that little endian does, ... >> something more complicated like just reverse the bytes of each member. ...
    (microsoft.public.win32.programmer.kernel)
  • Re: Big Endian Byte Ordering
    ... you will need probably set the packing level to 1. ... >> the two bytes in the reverse order that little endian does, ... >> something more complicated like just reverse the bytes of each member. ...
    (microsoft.public.vc.mfc)