abuf.py 文件源码

def _types_bitmap(cls, data, error):
        bits = []
        o = 0
        while o < len(data):
            fmt = "!BB"
            fmtsz = struct.calcsize(fmt)
            dat = data[o:o+fmtsz]
            if len(dat) != fmtsz:
                e = ("_types_bitmap", o, 'offset out of range: data size = %d' % len(data))
                error.append(e)
                return None
            block, bytes = struct.unpack(fmt, dat)
            o += fmtsz
            for i in range(bytes):
                b = struct.unpack("!B", data[o+i:o+i+1])[0]
                for j in range(8):
                        if b & (1 << (7-j)):
                                bits.append((block*32+i)*8+j)
            o += bytes
        return bits