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Re: Swapping variables of type float

Subject: Re: Swapping variables of type float
From: Steve Christensen <email@hidden>
Date: Wed, 7 Jun 2006 18:44:20 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

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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