5 files changed, 89 insertions, 11 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 012648d69..e9095ac52 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -588,6 +588,8 @@ add_library(core STATIC
     hle/service/mii/mii.h
     hle/service/mii/mii_manager.cpp
     hle/service/mii/mii_manager.h
+    hle/service/mii/mii_result.h
+    hle/service/mii/mii_util.h
     hle/service/mii/raw_data.cpp
     hle/service/mii/raw_data.h
     hle/service/mii/types.h
diff --git a/src/core/hle/service/mii/mii.cpp b/src/core/hle/service/mii/mii.cpp
index 65c11a2f3..bf3ee5907 100644
--- a/src/core/hle/service/mii/mii.cpp
+++ b/src/core/hle/service/mii/mii.cpp
@@ -7,13 +7,12 @@
 #include "core/hle/service/ipc_helpers.h"
 #include "core/hle/service/mii/mii.h"
 #include "core/hle/service/mii/mii_manager.h"
+#include "core/hle/service/mii/mii_result.h"
 #include "core/hle/service/server_manager.h"
 #include "core/hle/service/service.h"
 
 namespace Service::Mii {
 
-constexpr Result ERROR_INVALID_ARGUMENT{ErrorModule::Mii, 1};
-
 class IDatabaseService final : public ServiceFramework<IDatabaseService> {
 public:
     explicit IDatabaseService(Core::System& system_)
@@ -162,21 +161,21 @@ private:
 
         if (age > Age::All) {
             IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(ERROR_INVALID_ARGUMENT);
+            rb.Push(ResultInvalidArgument);
             LOG_ERROR(Service_Mii, "invalid age={}", age);
             return;
         }
 
         if (gender > Gender::All) {
             IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(ERROR_INVALID_ARGUMENT);
+            rb.Push(ResultInvalidArgument);
             LOG_ERROR(Service_Mii, "invalid gender={}", gender);
             return;
         }
 
         if (race > Race::All) {
             IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(ERROR_INVALID_ARGUMENT);
+            rb.Push(ResultInvalidArgument);
             LOG_ERROR(Service_Mii, "invalid race={}", race);
             return;
         }
@@ -196,7 +195,7 @@ private:
             LOG_ERROR(Service_Mii, "invalid argument, index cannot be greater than 5 but is {:08X}",
                       index);
             IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(ERROR_INVALID_ARGUMENT);
+            rb.Push(ResultInvalidArgument);
             return;
         }
 
diff --git a/src/core/hle/service/mii/mii_manager.cpp b/src/core/hle/service/mii/mii_manager.cpp
index dd632df50..392aa78da 100644
--- a/src/core/hle/service/mii/mii_manager.cpp
+++ b/src/core/hle/service/mii/mii_manager.cpp
@@ -10,14 +10,13 @@
 
 #include "core/hle/service/acc/profile_manager.h"
 #include "core/hle/service/mii/mii_manager.h"
+#include "core/hle/service/mii/mii_result.h"
 #include "core/hle/service/mii/raw_data.h"
 
 namespace Service::Mii {
 
 namespace {
 
-constexpr Result ERROR_CANNOT_FIND_ENTRY{ErrorModule::Mii, 4};
-
 constexpr std::size_t DefaultMiiCount{RawData::DefaultMii.size()};
 
 constexpr MiiStoreData::Name DefaultMiiName{u'n', u'o', u' ', u'n', u'a', u'm', u'e'};
@@ -410,11 +409,11 @@ u32 MiiManager::GetCount(SourceFlag source_flag) const {
 
 Result MiiManager::UpdateLatest(CharInfo* out_info, const CharInfo& info, SourceFlag source_flag) {
     if ((source_flag & SourceFlag::Database) == SourceFlag::None) {
-        return ERROR_CANNOT_FIND_ENTRY;
+        return ResultNotFound;
     }
 
     // TODO(bunnei): We don't implement the Mii database, so we can't have an entry
-    return ERROR_CANNOT_FIND_ENTRY;
+    return ResultNotFound;
 }
 
 CharInfo MiiManager::BuildRandom(Age age, Gender gender, Race race) {
@@ -695,7 +694,7 @@ Result MiiManager::GetIndex([[maybe_unused]] const CharInfo& info, u32& index) {
     index = INVALID_INDEX;
 
     // TODO(bunnei): We don't implement the Mii database, so we can't have an index
-    return ERROR_CANNOT_FIND_ENTRY;
+    return ResultNotFound;
 }
 
 } // namespace Service::Mii
diff --git a/src/core/hle/service/mii/mii_result.h b/src/core/hle/service/mii/mii_result.h
new file mode 100644
index 000000000..021cb76da
--- /dev/null
+++ b/src/core/hle/service/mii/mii_result.h
@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/result.h"
+
+namespace Service::Mii {
+
+constexpr Result ResultInvalidArgument{ErrorModule::Mii, 1};
+constexpr Result ResultInvalidArgumentSize{ErrorModule::Mii, 2};
+constexpr Result ResultNotUpdated{ErrorModule::Mii, 3};
+constexpr Result ResultNotFound{ErrorModule::Mii, 4};
+constexpr Result ResultDatabaseFull{ErrorModule::Mii, 5};
+constexpr Result ResultInvalidCharInfo{ErrorModule::Mii, 100};
+constexpr Result ResultInvalidStoreData{ErrorModule::Mii, 109};
+constexpr Result ResultInvalidOperation{ErrorModule::Mii, 202};
+constexpr Result ResultPermissionDenied{ErrorModule::Mii, 203};
+
+}; // namespace Service::Mii
diff --git a/src/core/hle/service/mii/mii_util.h b/src/core/hle/service/mii/mii_util.h
new file mode 100644
index 000000000..5eb6df317
--- /dev/null
+++ b/src/core/hle/service/mii/mii_util.h
@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <random>
+
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "common/uuid.h"
+#include "core/hle/service/mii/mii_types.h"
+
+namespace Service::Mii {
+class MiiUtil {
+public:
+    static u16 CalculateCrc16(const void* data, std::size_t size) {
+        s32 crc{};
+        for (std::size_t i = 0; i < size; i++) {
+            crc ^= static_cast<const u8*>(data)[i] << 8;
+            for (std::size_t j = 0; j < 8; j++) {
+                crc <<= 1;
+                if ((crc & 0x10000) != 0) {
+                    crc = (crc ^ 0x1021) & 0xFFFF;
+                }
+            }
+        }
+        return Common::swap16(static_cast<u16>(crc));
+    }
+
+    static Common::UUID MakeCreateId() {
+        return Common::UUID::MakeRandomRFC4122V4();
+    }
+
+    static Common::UUID GetDeviceId() {
+        // This should be nn::settings::detail::GetMiiAuthorId()
+        return Common::UUID::MakeDefault();
+    }
+
+    template <typename T>
+    static T GetRandomValue(T min, T max) {
+        std::random_device device;
+        std::mt19937 gen(device());
+        std::uniform_int_distribution<u64> distribution(static_cast<u64>(min),
+                                                        static_cast<u64>(max));
+        return static_cast<T>(distribution(gen));
+    }
+
+    template <typename T>
+    static T GetRandomValue(T max) {
+        return GetRandomValue<T>({}, max);
+    }
+
+    static bool IsFontRegionValid(FontRegion font, std::span<const char16_t> text) {
+        // Todo:: This function needs to check against the font tables
+        return true;
+    }
+};
+} // namespace Service::Mii