ubidump.py 文件源码

def readnode(self, lnum, offs):
        """
        read a node from a lnum + offset.
        """
        ch = UbiFsCommonHeader()
        hdrdata = self.vol.read(lnum, offs, ch.hdrsize)
        ch.parse(hdrdata)

        ch.lnum = lnum
        ch.offs = offs

        node = ch.getnode()
        nodedata = self.vol.read(lnum, offs + ch.hdrsize, ch.len - ch.hdrsize)

        if crc32(hdrdata[8:] + nodedata) != ch.crc:
            print(ch, node)
            print(" %s + %s = %08x -> want = %08x" % ( b2a_hex(hdrdata), b2a_hex(nodedata), crc32(hdrdata[8:] + nodedata), ch.crc))
            raise Exception("invalid node crc")
        node.parse(nodedata)

        return node