'Set the file\'s current position, like stdio\'s fseek().
The whence argument is optional and defaults to os.SEEK_SET or 0 (absolute
file positioning); other values are os.SEEK_CUR or 1 (seek relative to the
current position) and os.SEEK_END or 2 (seek relative to the file\'s end).
Args:
offset: The relative offset to seek to.
whence: Defines what the offset is relative to. See description for
details.'

def seek(self, offset, whence=SEEK_SET):

    if (whence == BlobReader.SEEK_CUR):
        offset = (self.__position + offset)
    elif (whence == BlobReader.SEEK_END):
        offset = (self.blob_info.size + offset)
    self.__buffer = ''
    self.__buffer_position = 0
    self.__position = offset
    self.__eof = False
