storage.py 文件源码

def unpack(self, buf):
        if len(buf) < self.pyr_len:
            raise StorageError("Buffer too short")
        self._magic, essidlen = struct.unpack(self.pyr_head, \
                                              buf[:self.pyr_len])
        if self._magic == 'PYR2':
            self._delimiter = '\n'
        elif self._magic == 'PYRT':
            self._delimiter = '\00'
        else:
            raise StorageError("Not a PYRT- or PYR2-buffer.")
        headfmt = "<%ssi16s" % (essidlen, )
        headsize = struct.calcsize(headfmt)
        header = buf[self.pyr_len:self.pyr_len + headsize]
        if len(header) != headsize:
            raise StorageError("Invalid header size")
        header = struct.unpack(headfmt, header)
        self.essid, self._numElems, self._digest = header
        pmkoffset = self.pyr_len + headsize
        pwoffset = pmkoffset + self._numElems * 32
        self._pwbuffer = buf[pwoffset:]
        self._pmkbuffer = buf[pmkoffset:pwoffset]
        if len(self._pmkbuffer) % 32 != 0:
            raise StorageError("pmkbuffer seems truncated")