Start populating serializer framework

SabreTools.Serialization/PathProcessor.cs

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+using System;
+using System.IO;
+using System.IO.Compression;
+
+namespace SabreTools.Serialization
+{
+    internal class PathProcessor
+    {
+        /// <summary>
+        /// Opens a path as a stream in a safe manner, decompressing if needed
+        /// </summary>
+        /// <param name="path">Path to open as a stream</param>
+        /// <returns>Stream representing the file, null on error</returns>
+        public static Stream? OpenStream(string path)
+        {
+            try
+            {
+                // If we don't have a file
+                if (string.IsNullOrWhiteSpace(path) || !File.Exists(path))
+                    return null;
+
+                // Open the file for deserialization
+                var stream = File.OpenRead(path);
+
+                // Get the extension to determine if additional handling is needed
+                string ext = Path.GetExtension(path).TrimStart('.');
+
+                // Determine what we do based on the extension
+                if (string.Equals(ext, "gz", StringComparison.OrdinalIgnoreCase))
+                {
+                    return new GZipStream(stream, CompressionMode.Decompress);
+                }
+                else if (string.Equals(ext, "zip", StringComparison.OrdinalIgnoreCase))
+                {
+                    // TODO: Support zip-compressed files
+                    return null;
+                }
+                else
+                {
+                    return stream;
+                }
+            }
+            catch
+            {
+                // TODO: Handle logging the exception
+                return null;
+            }
+        }
+    }
+}