1 files changed, 205 insertions, 0 deletions
diff --git a/Ryujinx.HLE/HOS/Services/Nfc/Nfp/VirtualAmiibo.cs b/Ryujinx.HLE/HOS/Services/Nfc/Nfp/VirtualAmiibo.cs
new file mode 100644
index 00000000..bd810d96
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Nfc/Nfp/VirtualAmiibo.cs
@@ -0,0 +1,205 @@
+using Ryujinx.Common.Configuration;
+using Ryujinx.Common.Memory;
+using Ryujinx.HLE.HOS.Services.Mii;
+using Ryujinx.HLE.HOS.Services.Mii.Types;
+using Ryujinx.HLE.HOS.Services.Nfc.Nfp.UserManager;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+
+namespace Ryujinx.HLE.HOS.Services.Nfc.Nfp
+{
+    static class VirtualAmiibo
+    {
+        private static uint _openedApplicationAreaId;
+
+        public static byte[] GenerateUuid(string amiiboId, bool useRandomUuid)
+        {
+            if (useRandomUuid)
+            {
+                return GenerateRandomUuid();
+            }
+
+            VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
+
+            if (virtualAmiiboFile.TagUuid.Length == 0)
+            {
+                virtualAmiiboFile.TagUuid = GenerateRandomUuid();
+
+                SaveAmiiboFile(virtualAmiiboFile);
+            }
+
+            return virtualAmiiboFile.TagUuid;
+        }
+
+        private static byte[] GenerateRandomUuid()
+        {
+            byte[] uuid = new byte[9];
+
+            new Random().NextBytes(uuid);
+
+            uuid[3] = (byte)(0x88    ^ uuid[0] ^ uuid[1] ^ uuid[2]);
+            uuid[8] = (byte)(uuid[3] ^ uuid[4] ^ uuid[5] ^ uuid[6]);
+
+            return uuid;
+        }
+
+        public static CommonInfo GetCommonInfo(string amiiboId)
+        {
+            VirtualAmiiboFile amiiboFile = LoadAmiiboFile(amiiboId);
+
+            return new CommonInfo()
+            {
+                LastWriteYear       = (ushort)amiiboFile.LastWriteDate.Year,
+                LastWriteMonth      = (byte)amiiboFile.LastWriteDate.Month,
+                LastWriteDay        = (byte)amiiboFile.LastWriteDate.Day,
+                WriteCounter        = amiiboFile.WriteCounter,
+                Version             = 1,
+                ApplicationAreaSize = AmiiboConstants.ApplicationAreaSize,
+                Reserved            = new Array52<byte>()
+            };
+        }
+
+        public static RegisterInfo GetRegisterInfo(string amiiboId)
+        {
+            VirtualAmiiboFile amiiboFile = LoadAmiiboFile(amiiboId);
+
+            UtilityImpl utilityImpl = new UtilityImpl();
+            CharInfo    charInfo    = new CharInfo();
+
+            charInfo.SetFromStoreData(StoreData.BuildDefault(utilityImpl, 0));
+
+            // TODO: Maybe change the "no name" by the player name when user profile will be implemented.
+            // charInfo.Nickname = Nickname.FromString("Nickname");
+
+            RegisterInfo registerInfo = new RegisterInfo()
+            {
+                MiiCharInfo     = charInfo,
+                FirstWriteYear  = (ushort)amiiboFile.FirstWriteDate.Year,
+                FirstWriteMonth = (byte)amiiboFile.FirstWriteDate.Month,
+                FirstWriteDay   = (byte)amiiboFile.FirstWriteDate.Day,
+                FontRegion      = 0,
+                Reserved1       = new Array64<byte>(),
+                Reserved2       = new Array58<byte>()
+            };
+
+            Encoding.ASCII.GetBytes("Ryujinx").CopyTo(registerInfo.Nickname.ToSpan());
+
+            return registerInfo;
+        }
+
+        public static bool OpenApplicationArea(string amiiboId, uint applicationAreaId)
+        {
+            VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
+
+            if (virtualAmiiboFile.ApplicationAreas.Any(item => item.ApplicationAreaId == applicationAreaId))
+            {
+                _openedApplicationAreaId = applicationAreaId;
+
+                return true;
+            }
+
+            return false;
+        }
+
+        public static byte[] GetApplicationArea(string amiiboId)
+        {
+            VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
+
+            foreach (VirtualAmiiboApplicationArea applicationArea in virtualAmiiboFile.ApplicationAreas)
+            {
+                if (applicationArea.ApplicationAreaId == _openedApplicationAreaId)
+                {
+                    return applicationArea.ApplicationArea;
+                }
+            }
+
+            return Array.Empty<byte>();
+        }
+
+        public static bool CreateApplicationArea(string amiiboId, uint applicationAreaId, byte[] applicationAreaData)
+        {
+            VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
+
+            if (virtualAmiiboFile.ApplicationAreas.Any(item => item.ApplicationAreaId == applicationAreaId))
+            {
+                return false;
+            }
+
+            virtualAmiiboFile.ApplicationAreas.Add(new VirtualAmiiboApplicationArea()
+            {
+                ApplicationAreaId = applicationAreaId,
+                ApplicationArea   = applicationAreaData
+            });
+
+            SaveAmiiboFile(virtualAmiiboFile);
+
+            return true;
+        }
+
+        public static void SetApplicationArea(string amiiboId, byte[] applicationAreaData)
+        {
+            VirtualAmiiboFile virtualAmiiboFile = LoadAmiiboFile(amiiboId);
+
+            if (virtualAmiiboFile.ApplicationAreas.Any(item => item.ApplicationAreaId == _openedApplicationAreaId))
+            {
+                for (int i = 0; i < virtualAmiiboFile.ApplicationAreas.Count; i++)
+                {
+                    if (virtualAmiiboFile.ApplicationAreas[i].ApplicationAreaId == _openedApplicationAreaId)
+                    {
+                        virtualAmiiboFile.ApplicationAreas[i] = new VirtualAmiiboApplicationArea()
+                        {
+                            ApplicationAreaId = _openedApplicationAreaId,
+                            ApplicationArea   = applicationAreaData
+                        };
+
+                        break;
+                    }
+                }
+
+                SaveAmiiboFile(virtualAmiiboFile);
+            }
+        }
+
+        private static VirtualAmiiboFile LoadAmiiboFile(string amiiboId)
+        {
+            Directory.CreateDirectory(Path.Join(AppDataManager.BaseDirPath, "system", "amiibo"));
+
+            string filePath = Path.Join(AppDataManager.BaseDirPath, "system", "amiibo", $"{amiiboId}.json");
+
+            VirtualAmiiboFile virtualAmiiboFile;
+
+            if (File.Exists(filePath))
+            {
+                virtualAmiiboFile = JsonSerializer.Deserialize<VirtualAmiiboFile>(File.ReadAllText(filePath));
+            }
+            else
+            {
+                virtualAmiiboFile = new VirtualAmiiboFile()
+                {
+                    FileVersion      = 0,
+                    TagUuid          = Array.Empty<byte>(),
+                    AmiiboId         = amiiboId,
+                    FirstWriteDate   = DateTime.Now,
+                    LastWriteDate    = DateTime.Now,
+                    WriteCounter     = 0,
+                    ApplicationAreas = new List<VirtualAmiiboApplicationArea>()
+                };
+
+                SaveAmiiboFile(virtualAmiiboFile);
+            }
+
+            return virtualAmiiboFile;
+        }
+
+        private static void SaveAmiiboFile(VirtualAmiiboFile virtualAmiiboFile)
+        {
+            string filePath = Path.Join(AppDataManager.BaseDirPath, "system", "amiibo", $"{virtualAmiiboFile.AmiiboId}.json");
+
+            File.WriteAllText(filePath, JsonSerializer.Serialize(virtualAmiiboFile));
+        }
+    }
+}
+\ No newline at end of file