Ryzom

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float binaryToFloat(long binary)
{
	/* s represents the sign, e the exponent and m the mantissa */
	char s = binary >> 31;
	unsigned char e = ((binary & 0x7fffffff) >> 23) - 127;
	long m = (binary & 0x007fffff) | (1 << 23);

	/* deleting non significant bits */
	while (!(m & 1))
		m>>=1;

	/* Finding the right coma position */
	char comaPos = 31 - e;
	long tmp = 0x80000000;
	while (!(m & tmp))
	{
		tmp>>=1;
		comaPos--;
	}
	
	/* conversion */
	float f = 0.;
	char i;
	for(i = 0; i < 32; i++)
		if(m & (1 << (i)))
			f += pow(2., (i-comaPos));

	s ? f*=-1 : true;
	return f;
}

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long hexToLong(char * hex)
{
	long binary = 0;
	char i;
	/* Little endian conversion */
	char dec[8] = {4, 0, 12, 8, 20, 16, 28, 24};

	for(i = 0; i < 8; i++)
		(*hex >= '0' && *hex <= '9') ? binary  |= (long)(*hex++ - '0') << dec[i] : binary  |= (long)(*hex++ - 'A' + 10) << dec[i];
	return binary;
}

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binaryToFloat(hexToLong("D47A7645"));