From 56e51da1d90010ee5cc9f3c278d278d42f438a88 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Fri, 4 Jan 2019 19:55:01 -0500
Subject: service/vi: Factor out scaling mode conversions from the IPC function
 itself

Avoids entangling the IPC buffer appending with the actual operation of
converting the scaling values over. This also inserts the proper error
handling for invalid scaling values.
---
 src/core/hle/service/vi/vi.cpp | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

(limited to 'src/core/hle/service/vi/vi.cpp')

diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index 266909ba4..b0ae074c9 100644
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -1003,7 +1003,7 @@ private:
         const u64 unknown = rp.Pop<u64>();
 
         LOG_DEBUG(Service_VI, "called. scaling_mode=0x{:08X}, unknown=0x{:016X}",
-                    static_cast<u32>(scaling_mode), unknown);
+                  static_cast<u32>(scaling_mode), unknown);
 
         IPC::ResponseBuilder rb{ctx, 2};
 
@@ -1102,31 +1102,35 @@ private:
 
     void ConvertScalingMode(Kernel::HLERequestContext& ctx) {
         IPC::RequestParser rp{ctx};
-        auto mode = rp.PopEnum<NintendoScaleMode>();
+        const auto mode = rp.PopEnum<NintendoScaleMode>();
         LOG_DEBUG(Service_VI, "called mode={}", static_cast<u32>(mode));
 
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(RESULT_SUCCESS);
+        const auto converted_mode = ConvertScalingModeImpl(mode);
+
+        if (converted_mode.Succeeded()) {
+            IPC::ResponseBuilder rb{ctx, 4};
+            rb.Push(RESULT_SUCCESS);
+            rb.PushEnum(*converted_mode);
+        } else {
+            IPC::ResponseBuilder rb{ctx, 2};
+            rb.Push(converted_mode.Code());
+        }
+    }
+
+    static ResultVal<ConvertedScaleMode> ConvertScalingModeImpl(NintendoScaleMode mode) {
         switch (mode) {
         case NintendoScaleMode::None:
-            rb.PushEnum(ConvertedScaleMode::None);
-            break;
+            return MakeResult(ConvertedScaleMode::None);
         case NintendoScaleMode::Freeze:
-            rb.PushEnum(ConvertedScaleMode::Freeze);
-            break;
+            return MakeResult(ConvertedScaleMode::Freeze);
         case NintendoScaleMode::ScaleToWindow:
-            rb.PushEnum(ConvertedScaleMode::ScaleToWindow);
-            break;
+            return MakeResult(ConvertedScaleMode::ScaleToWindow);
         case NintendoScaleMode::Crop:
-            rb.PushEnum(ConvertedScaleMode::Crop);
-            break;
+            return MakeResult(ConvertedScaleMode::Crop);
         case NintendoScaleMode::NoCrop:
-            rb.PushEnum(ConvertedScaleMode::NoCrop);
-            break;
+            return MakeResult(ConvertedScaleMode::NoCrop);
         default:
-            UNIMPLEMENTED_MSG("Unknown scaling mode {}", static_cast<u32>(mode));
-            rb.PushEnum(ConvertedScaleMode::None);
-            break;
+            return ERR_OPERATION_FAILED;
         }
     }
 
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