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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# See COPYING file for copyrights details.

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import md5

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class ConnectorBase(object):

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    chuncksize = 16384

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    def BlobFromFile(self, filepath): 

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        s = md5.new()

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        blobID = s.digest()  # empty md5, to support empty blob

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        with open(filepath, "rb") as f:

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            while True:

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                chunk = f.read(self.chuncksize) 

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                if len(chunk) == 0: return blobID

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                blobID = self.AppendChunkToBlob(chunk, blobID)

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                s.update(chunk)

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                if blobID != s.digest(): return None

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