public static int fromFloat(float fval, bool littleEndian)
{
int fbits = FileOutput.SingleToInt32Bits(fval, littleEndian);
int sign = fbits >> 16 & 0x8000; // sign only
int val = (fbits & 0x7fffffff) + 0x1000; // rounded value
if (val >= 0x47800000) // might be or become NaN/Inf
{ // avoid Inf due to rounding
if ((fbits & 0x7fffffff) >= 0x47800000)
{ // is or must become NaN/Inf
if (val < 0x7f800000) // was value but too large
{
return(sign | 0x7c00); // make it +/-Inf
}
return(sign | 0x7c00 | // remains +/-Inf or NaN
(fbits & 0x007fffff) >> 13); // keep NaN (and Inf) bits
}
return(sign | 0x7bff); // unrounded not quite Inf
}
if (val >= 0x38800000) // remains normalized value
{
return(sign | val - 0x38000000 >> 13); // exp - 127 + 15
}
if (val < 0x33000000) // too small for subnormal
{
return(sign); // becomes +/-0
}
val = (fbits & 0x7fffffff) >> 23; // tmp exp for subnormal calc
return(sign | ((fbits & 0x7fffff | 0x800000) // add subnormal bit
+ (0x800000 >> val - 102) // round depending on cut off
>> 126 - val)); // div by 2^(1-(exp-127+15)) and >> 13 | exp=0
}
