public static Encoding GetEncoding()

in src/Microsoft.VisualStudio.SlowCheetah/Transformer/TransformUtilities.cs [40:83]

• 35 lines of code
• 16 McCabe index (conditional complexity)

        public static Encoding GetEncoding(Stream stream)
        {
            if (stream == null)
            {
                throw new ArgumentNullException(nameof(stream));
            }

            // Read the BOM
            var bom = new byte[4];
            stream.Read(bom, 0, 4);

            // Analyze the BOM
            if (bom[0] == 0x2b && bom[1] == 0x2f && bom[2] == 0x76)
            {
                return Encoding.UTF7;
            }

            if (bom[0] == 0xef && bom[1] == 0xbb && bom[2] == 0xbf)
            {
                return Encoding.UTF8;
            }

            if (bom[0] == 0xff && bom[1] == 0xfe)
            {
                return Encoding.Unicode; // UTF-16LE
            }

            if (bom[0] == 0xfe && bom[1] == 0xff)
            {
                return Encoding.BigEndianUnicode; // UTF-16BE
            }

            if (bom[0] == 0 && bom[1] == 0 && bom[2] == 0xfe && bom[3] == 0xff)
            {
                return Encoding.UTF32;
            }

            using (StreamReader reader = new StreamReader(stream, true))
            {
                stream.Position = 0;
                reader.Peek();
                return reader.CurrentEncoding;
            }
        }