BinaryWriter.py 文件源码

def WriteFloat(self, v):
        if v < 0:
            neg = (1 << 31)
            v *= -1
        else:
            neg = 0
        if v == 0:
            e = 0
            m = 0
        else:
            e = int(floor(log2(v/0x1000000))+1 + 150)
        if e < 0 or e > 0xff:
            print("float off range, assuming zero", file=sys.stderr)
            e = 0
            m = 0

        elif e == 0:
            e = e << 23
            m = int(v / 2**(-150)) >> 1
        else:
            e = e << 23
            m = int(v/2**(floor(log2(v/0x1000000))+1))
            if m < 0x800000 or m >= 0x1000000:
                raise ValueError('float dump: bad m value')
            m &= 0x7fffff
        self.writeDword(neg | e | m)