Byte to Float

Has anyone seen a way to construct a float out of bytes?
I've gone down many "casting" paths and just end up with a big integer.

Going down the "array" path, I've gotten the following to compile, but the game crashes when the code setting the variable is called:
.
.
.
local byte B[255];
local array<float> myTestArray;
.
.
B[0]=0;
B[1]=128;
B[2]=173;
B[3]=67;
.
.

myTestArray[0] = float(B);

Thanks for any feedback.

I think that you're right - the typecast is impossible.

I wrote my own conversion function using the IEEE spec. Depending on Endian'ness, the order the bytes are sent to the function may have to be changed, but this worked for my purposes:

function float byteToFloat(byte floatWord[4])
{
local int i;
local float sign;
local float exponent;
local int fractionHold;
local float fraction;
local byte binaryFloat[32];
local float convertedFloat;

for(i=0;i<4;i++)
{
if (floatWord >= 128)
{
binaryFloat[(7+(8*i))]=1;
floatWord=floatWord-128;
}

if (floatWord >= 64)
{
binaryFloat[(6+(8*i))]=1;
floatWord=floatWord-64;
}

if (floatWord >= 32)
{
binaryFloat[(5+(8*i))]=1;
floatWord=floatWord-32;
}

if (floatWord >= 16)
{
binaryFloat[(4+(8*i))] = 1;
floatWord=floatWord-16;
}

if (floatWord >= 8)
{
binaryFloat[(3+(8*i))] = 1;
floatWord=floatWord-8;
}

if (floatWord >= 4)
{
binaryFloat[(2+(8*i))]=1;
floatWord=floatWord-4;
}

if (floatWord >= 2)
{
binaryFloat[(1+(8*i))]=1;
floatWord=floatWord-2;
}

if (floatWord >= 1)
{
binaryFloat[(0+(8*i))]=1;
floatWord=floatWord-1;
}


}

for(i=0;i<=22;i++)
{
if(binaryFloat==1)
{
fractionHold=fractionHold+(2**i);
}

}

fraction=float(string(1)$"."$string(fractionHold));

for(i=23;i<=30;i++)
{
if(binaryFloat==1)
{
exponent=exponent+(2**(i-23));
}
}

exponent=exponent-127;

if (binaryFloat[31]==1)
{
sign=-1;
}
if (binaryFloat[31]==0)
{
sign=1;
}

convertedFloat=sign*(2**exponent)*fraction;


return convertedFloat;

}

jimboh said:

You're trying to typecast the entire array of B to a single float. As far as I know...that's impossible...

You might want to try using a for loop:

Code:

local byte B[255];
local array<float> myTestArray;
local int i;

// Your code...

for (i=0; i<255; i++)
  myTestArray[i] = float(B[i]);

-Jimboh

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