Class _Stream

src/pptx/text/fonts.py:191–223

A thin wrapper around a binary file that facilitates reading C-struct values.

class _Stream(object):
    """A thin wrapper around a binary file that facilitates reading C-struct values."""

    def __init__(self, file):
        self._file = file

    @classmethod
    def open(cls, path):
        """Return |_Stream| providing binary access to contents of file at `path`."""
        return cls(open(path, "rb"))

    def close(self):
        """
        Close the wrapped file. Using the stream after closing raises an
        exception.
        """
        self._file.close()

    def read(self, offset, length):
        """
        Return *length* bytes from this stream starting at *offset*.
        """
        self._file.seek(offset)
        return self._file.read(length)

    def read_fields(self, template, offset=0):
        """
        Return a tuple containing the C-struct fields in this stream
        specified by *template* and starting at *offset*.
        """
        self._file.seek(offset)
        bufr = self._file.read(calcsize(template))
        return unpack_from(template, bufr)


class _BaseTable(object):