# Source code for numcodecs.gzip

    import gzip as _gzip
    import io

    from .abc import Codec
    from .compat import ensure_bytes, ensure_contiguous_ndarray

    class GZip(Codec):
        """Codec providing gzip compression using zlib via the Python standard library.

        Parameters
        ----------
        level : int
            Compression level.

        """

        codec_id = 'gzip'

        def __init__(self, level=1):
            self.level = level

        def encode(self, buf):

            # normalise inputs
            buf = ensure_contiguous_ndarray(buf)

            # do compression
            compressed = io.BytesIO()
            with _gzip.GzipFile(fileobj=compressed,
                                mode='wb',
                                compresslevel=self.level) as compressor:
                compressor.write(buf)
            compressed = compressed.getvalue()

            return compressed

        # noinspection PyMethodMayBeStatic

        def decode(self, buf, out=None):

            # normalise inputs
            # BytesIO only copies if the data is not of `bytes` type.
            # This allows `bytes` objects to pass through without copying.
            buf = io.BytesIO(ensure_bytes(buf))

            # do decompression
            with _gzip.GzipFile(fileobj=buf, mode='rb') as decompressor:
                if out is not None:
                    out_view = ensure_contiguous_ndarray(out)
                    decompressor.readinto(out_view)
                    if decompressor.read(1) != b'':
                        raise ValueError("Unable to fit data into `out`")
                else:
                    out = decompressor.read()

            return out