C++ (Cpp) UnsignedToFloat Examples

Example #1

File: ux_blorb.c Project: BAM-X/frotz

double ReadExtended(const unsigned char *bytes)
{
	double f;
	int expon;
	unsigned long hiMant, loMant;

	expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
	hiMant = ReadLong(bytes+2);
	loMant = ReadLong(bytes+6);

	if (expon == 0 && hiMant == 0 && loMant == 0)
		f = 0;
	else {
		if (expon == 0x7FFF) /* Infinity or NaN */
			f = -1;
		else {
			expon -= 16383;
			/* must #include <math.h> or these won't work */
			f = ldexp(UnsignedToFloat(hiMant),expon -= 31);
			f += ldexp(UnsignedToFloat(loMant),expon -= 32);
		}
	}

	if (bytes[0] & 0x80)
		return -f;
	return f;
}

Example #2

File: ieee.c Project: kyab/AiffPlayer

double ConvertFromIeeeExtended(unsigned char* bytes /* LCN */)
{
    double    f;
    int    expon;
    unsigned long hiMant, loMant;
    
    expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
    hiMant    =    ((unsigned long)(bytes[2] & 0xFF) << 24)
            |    ((unsigned long)(bytes[3] & 0xFF) << 16)
            |    ((unsigned long)(bytes[4] & 0xFF) << 8)
            |    ((unsigned long)(bytes[5] & 0xFF));
    loMant    =    ((unsigned long)(bytes[6] & 0xFF) << 24)
            |    ((unsigned long)(bytes[7] & 0xFF) << 16)
            |    ((unsigned long)(bytes[8] & 0xFF) << 8)
            |    ((unsigned long)(bytes[9] & 0xFF));

    if (expon == 0 && hiMant == 0 && loMant == 0) {
        f = 0;
    }
    else {
        if (expon == 0x7FFF) {    /* Infinity or NaN */
            f = HUGE_VAL;
        }
        else {
            expon -= 16383;
            f  = ldexp(UnsignedToFloat(hiMant), expon-=31);
            f += ldexp(UnsignedToFloat(loMant), expon-=32);
        }
    }

    if (bytes[0] & 0x80)
        return -f;
    else
        return f;
}

Example #3

File: extended.c Project: vdm113/wxWidgets-ICC-patch

WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes)
{
    wxFloat64 f;
    wxInt32 expon;
    wxUint32 hiMant, loMant;

    expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
    hiMant = ((wxUint32)(bytes[2] & 0xFF) << 24)
            | ((wxUint32)(bytes[3] & 0xFF) << 16)
            | ((wxUint32)(bytes[4] & 0xFF) << 8)
            | ((wxUint32)(bytes[5] & 0xFF));
    loMant = ((wxUint32)(bytes[6] & 0xFF) << 24)
            | ((wxUint32)(bytes[7] & 0xFF) << 16)
            | ((wxUint32)(bytes[8] & 0xFF) << 8)
            | ((wxUint32)(bytes[9] & 0xFF));

    if (expon == 0 && hiMant == 0 && loMant == 0) {
        f = 0;
    }
    else {
        if (expon == 0x7FFF) { /* Infinity or NaN */
            f = HUGE_VAL;
        }
        else {
            expon -= 16383;
            f  = ldexp(UnsignedToFloat(hiMant), expon-=31);
            f += ldexp(UnsignedToFloat(loMant), expon-=32);
        }
    }

    if (bytes[0] & 0x80)
        return -f;
    else
        return f;
}