Re: Swapping variables of type float

• Subject: Re: Swapping variables of type float
• From: David Alger <email@hidden>
• Date: Wed, 7 Jun 2006 21:14:43 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Thanks Steve,

The code sample you gave looks great and I'll put it to good use.

Sincerely,
David Alger

Family Friendly Software, LLC
http://www.familyfriendlysoftware.com

On Jun 7, 2006, at 8:44 PM, Steve Christensen wrote:

On Jun 7, 2006, at 6:00 PM, David Alger wrote:

I have some structs that I write/read to and from disk, and they have > 1 byte variables that need to be swapped.

My question is would you swap a type 'float' var just as you would a UInt16?

Yes, since the byte ordering is likewise reversed. You just have to be careful that an unexpected type conversion doesn't occur when copying the float into a UInt32 so that it can be swapped. Maybe do something like this?

inline float SwapBigEndianFloatToHost(float unswappedFloat)
{
#if defined(__BIG_ENDIAN__)

    return unswappedFloat;

#else

    union
    {
        float   fFloat;
        UInt32  fFloatAsUInt32;
    } swapper;

swapper.fFloat = unswappedFloat;
swapper.fFloatAsUInt32 = CFSwapInt32BigToHost (swapper.fFloatAsUInt32);

    return swapper.fFloat;

#endif
}

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