System.IO.Compression.Deflater.DeflateInit C# (CSharp) Method

        private void DeflateInit(ZLibNative.CompressionLevel compressionLevel, int windowBits, int memLevel,
                                 ZLibNative.CompressionStrategy strategy)
        {
            ZErrorCode errC;
            try
            {
                errC = ZLibNative.CreateZLibStreamForDeflate(out _zlibStream, compressionLevel,
                                                             windowBits, memLevel, strategy);
            }
            catch (Exception cause)
            {
                throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
            }

            switch (errC)
            {
                case ZErrorCode.Ok:
                    return;

                case ZErrorCode.MemError:
                    throw new ZLibException(SR.ZLibErrorNotEnoughMemory, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());

                case ZErrorCode.VersionError:
                    throw new ZLibException(SR.ZLibErrorVersionMismatch, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());

                case ZErrorCode.StreamError:
                    throw new ZLibException(SR.ZLibErrorIncorrectInitParameters, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());

                default:
                    throw new ZLibException(SR.ZLibErrorUnexpected, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());
            }
        }