From ac4fc8034cd42e422965432ad500fc67d21ce4e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20R=C3=A4tzel?= <Viir@Viir.de>
Date: Sun, 26 May 2024 19:21:58 +0000
Subject: [PATCH] Support reading python object type "Link"

Today we discovered the old way of reading 'Current Solar System' did not work anymore. It turned out that the '_setText' property of the label now references an object of type 'Link', which in turn contained a reference to a dictionary. That dictionary contains the properties of interest, three strings with keys '_alt', '_text', and '_url'. The '_text' property contained the current solar system name string as shown to the user.
---
 implement/read-memory-64-bit/Program.cs | 52 ++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/implement/read-memory-64-bit/Program.cs b/implement/read-memory-64-bit/Program.cs
index 34b89af..1864189 100644
--- a/implement/read-memory-64-bit/Program.cs
+++ b/implement/read-memory-64-bit/Program.cs
@@ -10,7 +10,7 @@ namespace read_memory_64_bit;
 
 class Program
 {
-    static string AppVersionId => "2024-05-25";
+    static string AppVersionId => "2024-05-26";
 
     static int Main(string[] args)
     {
@@ -738,7 +738,12 @@ struct LocalMemoryReadingTools
         .Add("bool", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_bool))
         .Add("float", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_float))
         .Add("PyColor", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_PyColor))
-        .Add("Bunch", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_Bunch));
+        .Add("Bunch", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_Bunch))
+        /*
+         * 2024-05-26 observed dict entry with key "_setText" pointing to a python object of type "Link".
+         * The client used that instance of "Link" to display "Current Solar System" label in the location info panel.
+         * */
+        .Add("Link", new Func<ulong, LocalMemoryReadingTools, object>(ReadingFromPythonType_Link));
 
     static object ReadingFromPythonType_str(ulong address, LocalMemoryReadingTools memoryReadingTools)
     {
@@ -876,6 +881,49 @@ static object ReadingFromPythonType_Bunch(ulong address, LocalMemoryReadingTools
         );
     }
 
+    static object ReadingFromPythonType_Link(ulong address, LocalMemoryReadingTools memoryReadingTools)
+    {
+        var pythonObjectTypeName = memoryReadingTools.GetPythonTypeNameFromPythonObjectAddress(address);
+
+        var linkMemory = memoryReadingTools.memoryReader.ReadBytes(address, 0x40);
+
+        if (linkMemory is null)
+            return null;
+
+        var linkMemoryAsLongMemory = TransformMemoryContent.AsULongMemory(linkMemory.Value);
+
+        /*
+         * 2024-05-26 observed a reference to a dictionary object at offset 6 * 4 bytes.
+         * */
+
+        var firstDictReference =
+            linkMemoryAsLongMemory
+            .ToArray()
+            .Where(reference =>
+            {
+                var referencedObjectTypeName = memoryReadingTools.GetPythonTypeNameFromPythonObjectAddress(reference);
+
+                return referencedObjectTypeName is "dict";
+            })
+            .FirstOrDefault();
+
+        if (firstDictReference is 0)
+            return null;
+
+        var dictEntries =
+            memoryReadingTools.getDictionaryEntriesWithStringKeys(firstDictReference)
+            ?.ToImmutableDictionary(
+                keySelector: dictEntry => dictEntry.Key,    
+                elementSelector: dictEntry => memoryReadingTools.GetDictEntryValueRepresentation(dictEntry.Value));
+
+        return new UITreeNode(
+            pythonObjectAddress: address,
+            pythonObjectTypeName: pythonObjectTypeName,
+            dictEntriesOfInterest: dictEntries,
+            otherDictEntriesKeys: null,
+            children: null);
+    }
+
 
     class MemoryReadingCache
     {