Brought spec up to date, improvements to stability

XmlFormat/IO/XmlFileReader.cs

@@ -11,7 +11,7 @@ namespace RobloxFiles.XmlFormat
         {
             var errorHandler = new Func<string, Exception>((message) =>
             {
-                string contents = $"XmlDataReader.{label}: {message}";
+                string contents = $"XmlRobloxFileReader.{label}: {message}";
                 return new Exception(contents);
             });
 
@@ -29,19 +29,25 @@ namespace RobloxFiles.XmlFormat
             {
                 if (sharedString.Name == "SharedString")
                 {
-                    XmlNode md5Node = sharedString.Attributes.GetNamedItem("md5");
+                    XmlNode hashNode = sharedString.Attributes.GetNamedItem("md5");
 
-                    if (md5Node == null)
+                    if (hashNode == null)
                         throw error("Got a SharedString without an 'md5' attribute!");
 
-                    string key = md5Node.InnerText;
+                    string key = hashNode.InnerText;
                     string value = sharedString.InnerText.Replace("\n", "");
 
-                    byte[] buffer = Convert.FromBase64String(value);
-                    SharedString record = SharedString.FromBase64(value);
+                    byte[] hash = Convert.FromBase64String(key);
+                    var record = SharedString.FromBase64(value);
 
-                    if (record.MD5_Key != key)
-                        throw error("The provided md5 hash did not match with the md5 hash computed for the value!");
+                    if (hash.Length != 16)
+                        throw error($"SharedString base64 key '{key}' must decode to byte[16]!");
+
+                    if (key != record.Key)
+                    {
+                        SharedString.Register(key, record.SharedValue);
+                        record.Key = key;
+                    }
 
                     file.SharedStrings.Add(key);
                 }

XmlFormat/IO/XmlFileWriter.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Text;
 using System.Xml;
 
@@ -47,6 +48,9 @@ namespace RobloxFiles.XmlFormat
 
         public static XmlNode WriteProperty(Property prop, XmlDocument doc, XmlRobloxFile file)
         {
+            if (prop.Name == "Archivable")
+                return null;
+
             string propType = prop.XmlToken;
 
             if (propType == null)
@@ -78,6 +82,7 @@ namespace RobloxFiles.XmlFormat
                     case PropertyType.String:
                         propType = (prop.HasRawBuffer ? "BinaryString" : "string");
                         break;
+                    default: break;
                 }
             }
             
@@ -89,6 +94,19 @@ namespace RobloxFiles.XmlFormat
                 return null;
             }
 
+            if (prop.Type == PropertyType.SharedString)
+            {
+                SharedString value = prop.CastValue<SharedString>();
+                
+                if (value.ComputedKey == null)
+                {
+                    var newShared = SharedString.FromBuffer(value.SharedValue);
+                    value.Key = newShared.ComputedKey;
+                }
+
+                file.SharedStrings.Add(value.Key);
+            }
+
             XmlElement propElement = doc.CreateElement(propType);
             propElement.SetAttribute("name", prop.Name);
 
@@ -102,12 +120,6 @@ namespace RobloxFiles.XmlFormat
                 propNode = newNode;
             }
 
-            if (prop.Type == PropertyType.SharedString)
-            {
-                SharedString value = prop.CastValue<SharedString>();
-                file.SharedStrings.Add(value.MD5_Key);
-            }
-
             return propNode;
         }
 
@@ -124,11 +136,19 @@ namespace RobloxFiles.XmlFormat
             instNode.AppendChild(propsNode);
 
             var props = instance.RefreshProperties();
+
+            var orderedKeys = props
+                .OrderBy(pair => pair.Key)
+                .Select(pair => pair.Key);
             
-            foreach (string propName in props.Keys)
+            foreach (string propName in orderedKeys)
             {
                 Property prop = props[propName];
                 XmlNode propNode = WriteProperty(prop, doc, file);
+
+                if (propNode == null)
+                    continue;
+
                 propsNode.AppendChild(propNode);
             }
 
@@ -151,12 +171,12 @@ namespace RobloxFiles.XmlFormat
             var binaryWriter = XmlPropertyTokens.GetHandler<BinaryStringToken>();
             var binaryBuffer = new Property("SharedString", PropertyType.String);
 
-            foreach (string md5 in file.SharedStrings)
+            foreach (string key in file.SharedStrings)
             {
                 XmlElement sharedString = doc.CreateElement("SharedString");
-                sharedString.SetAttribute("md5", md5);
+                sharedString.SetAttribute("md5", key);
 
-                binaryBuffer.RawBuffer = SharedString.FindRecord(md5);
+                binaryBuffer.RawBuffer = SharedString.Find(key);
                 binaryWriter.WriteProperty(binaryBuffer, doc, sharedString);
 
                 sharedStrings.AppendChild(sharedString);