From 54e13015d87c23e32176235b3a2fde707ae60155 Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Mon, 28 Sep 2020 20:24:58 +1000
Subject: [PATCH] Cheats: Implement C2/memory copy instruction

---
 src/core/cheats.cpp | 26 ++++++++++++++++++++++++++
 src/core/cheats.h   |  3 ++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/core/cheats.cpp b/src/core/cheats.cpp
index c031e041b..f73594aad 100644
--- a/src/core/cheats.cpp
+++ b/src/core/cheats.cpp
@@ -579,6 +579,32 @@ void CheatCode::Apply() const
       }
       break;
 
+      case InstructionCode::MemoryCopy:
+      {
+        if ((index + 1) >= instructions.size())
+        {
+          Log_ErrorPrintf("Incomplete memory copy instruction");
+          return;
+        }
+
+        const Instruction& inst2 = instructions[index + 1];
+        const u32 byte_count = inst.value16;
+        u32 src_address = inst.address;
+        u32 dst_address = inst2.address;
+
+        for (u32 i = 0; i < byte_count; i++)
+        {
+          u8 value = 0;
+          CPU::SafeReadMemoryByte(src_address, &value);
+          CPU::SafeWriteMemoryByte(dst_address, value);
+          src_address++;
+          dst_address++;
+        }
+
+        index += 2;
+      }
+      break;
+
       default:
       {
         Log_ErrorPrintf("Unhandled instruction code 0x%02X (%08X %08X)", static_cast<u8>(inst.code.GetValue()),
diff --git a/src/core/cheats.h b/src/core/cheats.h
index a4f7091a0..6447eb64d 100644
--- a/src/core/cheats.h
+++ b/src/core/cheats.h
@@ -24,7 +24,8 @@ struct CheatCode
     CompareNotEqual8 = 0xE1,
     CompareLess8 = 0xE2,
     CompareGreater8 = 0xE3,
-    Slide = 0x50
+    Slide = 0x50,
+    MemoryCopy = 0xC2
   };
 
   union Instruction