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/*** MSBIN conversion routines ***/
/*** public domain by Jeffery Foy ***/
union Converter {
unsigned char uc[10];
unsigned int ui[5];
unsigned long ul[2];
float f[2];
double d[1];
};
/* MSBINToIEEE - Converts an MSBIN floating point number */
/* to IEEE floating point format */
/* */
/* Input: f - floating point number in MSBIN format */
/* Output: Same number in IEEE format */
float MSBINToIEEE(float f)
{
union Converter t;
int sign, exp; /* sign and exponent */
t.f[0] = f;
/* extract the sign & move exponent bias from 0x81 to 0x7f */
sign = t.uc[2] / 0x80;
exp = (t.uc[3] - 0x81 + 0x7f) & 0xff;
/* reassemble them in IEEE 4 byte real number format */
t.ui[1] = (t.ui[1] & 0x7f) | (exp << 7) | (sign << 15);
return t.f[0];
} /* End of MSBINToIEEE */
/* IEEEToMSBIN - Converts an IEEE floating point number */
/* to MSBIN floating point format */
/* */
/* Input: f - floating point number in IEEE format */
/* Output: Same number in MSBIN format */
float IEEEToMSBIN(float f)
{
union Converter t;
int sign, exp; /* sign and exponent */
t.f[0] = f;
/* extract sign & change exponent bias from 0x7f to 0x81 */
sign = t.uc[3] / 0x80;
exp = ((t.ui[1] >> 7) - 0x7f + 0x81) & 0xff;
/* reassemble them in MSBIN format */
t.ui[1] = (t.ui[1] & 0x7f) | (sign << 7) | (exp << 8);
return t.f[0];
} /* End of IEEEToMSBIN */
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