From 38a09facea848f7d726efbba4afe03999087d7a4 Mon Sep 17 00:00:00 2001
From: ghorsington <neigh@coder.horse>
Date: Fri, 7 Aug 2020 18:25:13 +0300
Subject: [PATCH] Annotate byte patterns; fix x64 calling convention to correct
 one

---
 .../Platforms/X64Patcher.cs                   | 20 ++++++-------
 .../Platforms/X86Patcher.cs                   | 30 +++++++++----------
 src/MirrorInternalLogs/Util/BytePattern.cs    |  6 +---
 .../Util/StringExtensions.cs                  | 30 +++++++++++++++++++
 4 files changed, 56 insertions(+), 30 deletions(-)

diff --git a/src/MirrorInternalLogs/Platforms/X64Patcher.cs b/src/MirrorInternalLogs/Platforms/X64Patcher.cs
index 71e484b..4b30804 100644
--- a/src/MirrorInternalLogs/Platforms/X64Patcher.cs
+++ b/src/MirrorInternalLogs/Platforms/X64Patcher.cs
@@ -12,15 +12,15 @@ internal class X64Patcher : X86Patcher
         protected override BytePattern[] Patterns { get; } =
         {
             @"
-                48 89 4C 24 08
-                48 89 54 24 10
-                4C 89 44 24 18
-                4C 89 4C 24 20
-                48 83 EC 28
-                48 8B D1
-                4C 8D 44 24 38
-                B9 05 00 00 00
-                E8
+                48 89 4C 24 08        ; mov    QWORD PTR [rsp+0x8],rcx
+                48 89 54 24 10        ; mov    QWORD PTR [rsp+0x10],rdx
+                4C 89 44 24 18        ; mov    QWORD PTR [rsp+0x18],r8
+                4C 89 4C 24 20        ; mov    QWORD PTR [rsp+0x20],r9
+                48 83 EC 28           ; sub    rsp,0x28
+                48 8B D1              ; mov    rdx,rcx
+                4C 8D 44 24 38        ; lea    r8,[rsp+0x38]
+                B9 05 00 00 00        ; mov    ecx,0x5
+                E8                    ; call
             "
         };
 
@@ -39,7 +39,7 @@ private static void OnUnityLog(ulong type, IntPtr message, IntPtr args)
             original(type, message, args);
         }
 
-        [UnmanagedFunctionPointer(CallingConvention.FastCall)]
+        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
         private delegate void PrintFDelegate(ulong type, IntPtr pattern, IntPtr parts);
     }
 }
\ No newline at end of file
diff --git a/src/MirrorInternalLogs/Platforms/X86Patcher.cs b/src/MirrorInternalLogs/Platforms/X86Patcher.cs
index cf4eed5..217a4d8 100644
--- a/src/MirrorInternalLogs/Platforms/X86Patcher.cs
+++ b/src/MirrorInternalLogs/Platforms/X86Patcher.cs
@@ -14,24 +14,24 @@ internal class X86Patcher : IPlatformPatcher
         {
             // New Unity
             @"
-                55
-                8B EC
-                8D 45 0C
-                50
-                FF 75 08
-                6A 05
-                E8
+                55            ; push   ebp
+                8B EC         ; mov    ebp,esp
+                8D 45 0C      ; lea    eax,[ebp+0xc]
+                50            ; push   eax
+                FF 75 08      ; push   DWORD PTR [ebp+0x8]
+                6A 05         ; push   0x5
+                E8            ; call
             ",
             // Older Unity
             @"
-                55
-                8B EC
-                8B 4D 08
-                8D 45 0C
-                50
-                51
-                6A 05
-                E8
+                55            ; push   ebp
+                8B EC         ; mov    ebp,esp
+                8B 4D 08      ; mov    ecx,DWORD PTR [ebp+0x8]
+                8D 45 0C      ; lea    eax,[ebp+0xc]
+                50            ; push   eax
+                51            ; push   ecx
+                6A 05         ; push   0x5
+                E8            ; call
             "
         };
 
diff --git a/src/MirrorInternalLogs/Util/BytePattern.cs b/src/MirrorInternalLogs/Util/BytePattern.cs
index 64c9ed0..ff1a4bc 100644
--- a/src/MirrorInternalLogs/Util/BytePattern.cs
+++ b/src/MirrorInternalLogs/Util/BytePattern.cs
@@ -11,11 +11,7 @@ internal class BytePattern
 
         public BytePattern(string bytes)
         {
-            pattern = bytes.Replace("\t", " ")
-                .Replace("\r", " ")
-                .Replace("\n", " ")
-                .Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries)
-                .Select(p => byte.Parse(p.Trim(), NumberStyles.HexNumber)).ToArray();
+            pattern = bytes.ParseHexBytes();
             CreateJumpTable();
         }
 
diff --git a/src/MirrorInternalLogs/Util/StringExtensions.cs b/src/MirrorInternalLogs/Util/StringExtensions.cs
index f06f137..dbf25bc 100644
--- a/src/MirrorInternalLogs/Util/StringExtensions.cs
+++ b/src/MirrorInternalLogs/Util/StringExtensions.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
 using System.Linq;
 
 namespace MirrorInternalLogs.Util
@@ -10,5 +12,33 @@ public static string Format(this string fmt, Dictionary<string, Func<string>> va
         {
             return vars.Aggregate(fmt, (str, kv) => str.Replace($"{{{kv.Key}}}", kv.Value()));
         }
+
+        public static byte[] ParseHexBytes(this string str)
+        {
+            static bool IsHexChar(char lowerC) => '0' <= lowerC && lowerC <= '9' || 'a' <= lowerC && lowerC <= 'f';
+            var result = new List<byte>(); 
+            
+            var sr = new StringReader(str);
+            while (sr.Peek() > 0)
+            {
+                var c = char.ToLower((char) sr.Read());
+
+                if (char.IsWhiteSpace(c))
+                    continue;
+                if (c == ';')
+                {
+                    sr.ReadLine();
+                }
+                else if (IsHexChar(c) && sr.Peek() > 0)
+                {
+                    var other = char.ToLower((char) sr.Peek());
+                    if (!IsHexChar(other)) continue;
+                    sr.Read();
+                    result.Add(byte.Parse($"{c}{other}", NumberStyles.HexNumber));
+                }
+            }
+
+            return result.ToArray();
+        }
     }
 }
\ No newline at end of file