connectors/ConnectorBase.py
author Edouard Tisserant
Mon, 29 Mar 2021 14:35:45 +0200
branchsvghmi
changeset 3208 b5330d76e225
parent 2621 af09744a468e
child 3750 f62625418bff
child 3861 7e17f7e02a2b
permissions -rw-r--r--
SVGHMI: Fix update of HMI tree in UI when loading from XML at start. Removed some dead code left after split of svghmi.py into svghmi.py+ui.py.
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# See COPYING file for copyrights details.

from __future__ import absolute_import
import hashlib


class ConnectorBase(object):

    chuncksize = 1024*1024

    def BlobFromFile(self, filepath, seed):
        s = hashlib.new('md5')
        s.update(seed)
        blobID = self.SeedBlob(seed)
        with open(filepath, "rb") as f:
            while blobID == s.digest():
                chunk = f.read(self.chuncksize)
                if len(chunk) == 0:
                    return blobID
                blobID = self.AppendChunkToBlob(chunk, blobID)
                s.update(chunk)
        raise IOError("Data corrupted during transfer or connection lost")