Fix inconsistencies with UserId (#906)

* Fix inconsistencies with UserId

The account user id isn't an UUID. This PR adds a new UserId type with
the correct value ordering to avoid mismatch with LibHac's Uid. This also fix
an hardcoded value of the UserId.

As the userid has been invalid for quite some time (and to avoid forcing
users to their recreate saves), the userid has been changed to "00000000000000010000000000000000".

Also implement a stub for IApplicationFunctions::GetSaveDataSize. (see
the sources for the reason)

Fix #626

* Address jd's & Ac_k's comments

1 files changed, 4 insertions, 3 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Sdb/Pdm/QueryService/QueryPlayStatisticsManager.cs b/Ryujinx.HLE/HOS/Services/Sdb/Pdm/QueryService/QueryPlayStatisticsManager.cs
index 925a2593..ce85ff20 100644
--- a/Ryujinx.HLE/HOS/Services/Sdb/Pdm/QueryService/QueryPlayStatisticsManager.cs
+++ b/Ryujinx.HLE/HOS/Services/Sdb/Pdm/QueryService/QueryPlayStatisticsManager.cs
@@ -1,6 +1,7 @@
 using ARMeilleure.Memory;
+using Ryujinx.Common;
+using Ryujinx.HLE.HOS.Services.Account.Acc;
 using Ryujinx.HLE.HOS.Services.Sdb.Pdm.QueryService.Types;
-using Ryujinx.HLE.Utilities;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -10,7 +11,7 @@ namespace Ryujinx.HLE.HOS.Services.Sdb.Pdm.QueryService
 {
     static class QueryPlayStatisticsManager
     {
-        private static Dictionary<UInt128, ApplicationPlayStatistics> applicationPlayStatistics = new Dictionary<UInt128, ApplicationPlayStatistics>();
+        private static Dictionary<UserId, ApplicationPlayStatistics> applicationPlayStatistics = new Dictionary<UserId, ApplicationPlayStatistics>();
 
         internal static ResultCode GetPlayStatistics(ServiceCtx context, bool byUserId = false)
         {
@@ -20,7 +21,7 @@ namespace Ryujinx.HLE.HOS.Services.Sdb.Pdm.QueryService
             long outputPosition = context.Request.ReceiveBuff[0].Position;
             long outputSize     = context.Request.ReceiveBuff[0].Size;
 
-            UInt128 userId = byUserId ? new UInt128(context.RequestData.ReadBytes(0x10)) : new UInt128();
+            UserId userId = byUserId ? context.RequestData.ReadStruct<UserId>() : new UserId();
 
             if (byUserId)
             {