bcat:u: Implement EnumerateDeliveryCacheDirectory (#768)

* bcat:u: Implement EnumerateDeliveryCacheDirectory

Basic implementation `EnumerateDeliveryCacheDirectory` call to `IDeliveryCacheStorageService` according to RE.  (close #622)
I've added some comments in the whole service for when we'll implement a real bcat implementation.
For now, all games who use it isn't playable because of GPU.

* Use Array instead of List

* Add ApplicationLaunchPropertyHelper

* Fix helper

* Fix helper 2

* Fix ApplicationLaunchProperty Default

* Fix ApplicationLaunchProperty 2

* Fix folder

4 files changed, 78 insertions, 6 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Bcat/IBcatService.cs b/Ryujinx.HLE/HOS/Services/Bcat/IBcatService.cs
index 6fdcba46..030f9110 100644
--- a/Ryujinx.HLE/HOS/Services/Bcat/IBcatService.cs
+++ b/Ryujinx.HLE/HOS/Services/Bcat/IBcatService.cs
@@ -1,7 +1,9 @@
+using Ryujinx.HLE.HOS.Services.Glue;
+
 namespace Ryujinx.HLE.HOS.Services.Bcat
 {
     class IBcatService : IpcService
     {
-        public IBcatService() { }
+        public IBcatService(ApplicationLaunchProperty applicationLaunchProperty) { }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Services/Bcat/IDeliveryCacheStorageService.cs b/Ryujinx.HLE/HOS/Services/Bcat/IDeliveryCacheStorageService.cs
index 5e3db998..1c9aed11 100644
--- a/Ryujinx.HLE/HOS/Services/Bcat/IDeliveryCacheStorageService.cs
+++ b/Ryujinx.HLE/HOS/Services/Bcat/IDeliveryCacheStorageService.cs
@@ -1,7 +1,47 @@
+using Ryujinx.HLE.HOS.Services.Glue;
+using System;
+using System.Text;
+
 namespace Ryujinx.HLE.HOS.Services.Bcat
 {
     class IDeliveryCacheStorageService : IpcService
     {
-        public IDeliveryCacheStorageService() { }
+        private const int DeliveryCacheDirectoriesLimit    = 100;
+        private const int DeliveryCacheDirectoryNameLength = 32;
+
+        private string[] _deliveryCacheDirectories = new string[0];
+
+        public IDeliveryCacheStorageService(ServiceCtx context, ApplicationLaunchProperty applicationLaunchProperty)
+        {
+            // TODO: Read directories.meta file from the save data (loaded in IServiceCreator) in _deliveryCacheDirectories.
+        }
+
+        [Command(10)]
+        // EnumerateDeliveryCacheDirectory() -> (u32, buffer<nn::bcat::DirectoryName, 6>)
+        public ResultCode EnumerateDeliveryCacheDirectory(ServiceCtx context)
+        {
+            long outputPosition = context.Request.ReceiveBuff[0].Position;
+            long outputSize     = context.Request.ReceiveBuff[0].Size;
+
+            for (int index = 0; index < _deliveryCacheDirectories.Length; index++)
+            {
+                if (index == DeliveryCacheDirectoriesLimit - 1)
+                {
+                    break;
+                }
+
+                byte[] directoryNameBuffer = Encoding.ASCII.GetBytes(_deliveryCacheDirectories[index]);
+
+                Array.Resize(ref directoryNameBuffer, DeliveryCacheDirectoryNameLength);
+
+                directoryNameBuffer[DeliveryCacheDirectoryNameLength - 1] = 0x00;
+                
+                context.Memory.WriteBytes(outputPosition + index * DeliveryCacheDirectoryNameLength, directoryNameBuffer);
+            }
+
+            context.ResponseData.Write(_deliveryCacheDirectories.Length);
+
+            return ResultCode.Success;
+        }
     }
 }
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Services/Bcat/IServiceCreator.cs b/Ryujinx.HLE/HOS/Services/Bcat/IServiceCreator.cs
index e2a3b352..4e9d3656 100644
--- a/Ryujinx.HLE/HOS/Services/Bcat/IServiceCreator.cs
+++ b/Ryujinx.HLE/HOS/Services/Bcat/IServiceCreator.cs
@@ -1,3 +1,5 @@
+using Ryujinx.HLE.HOS.Services.Glue;
+
 namespace Ryujinx.HLE.HOS.Services.Bcat
 {
     [Service("bcat:a")]
@@ -12,9 +14,16 @@ namespace Ryujinx.HLE.HOS.Services.Bcat
         // CreateBcatService(u64, pid) -> object<nn::bcat::detail::ipc::IBcatService>
         public ResultCode CreateBcatService(ServiceCtx context)
         {
-            long id = context.RequestData.ReadInt64();
+            // TODO: Call arp:r GetApplicationLaunchProperty with the pid to get the TitleId.
+            //       Add an instance of nn::bcat::detail::service::core::PassphraseManager.
+            //       Add an instance of nn::bcat::detail::service::ServiceMemoryManager.
+            //       Add an instance of nn::bcat::detail::service::core::TaskManager who load "bcat-sys:/" system save data and open "dc/task.bin". 
+            //       If the file don't exist, create a new one (size of 0x800) and write 2 empty struct with a size of 0x400.
+
+            MakeObject(context, new IBcatService(ApplicationLaunchProperty.GetByPid(context)));
 
-            MakeObject(context, new IBcatService());
+            // NOTE: If the IBcatService is null this error is returned, Doesn't occur in our case. 
+            //       return ResultCode.NullObject;
 
             return ResultCode.Success;
         }
@@ -23,9 +32,16 @@ namespace Ryujinx.HLE.HOS.Services.Bcat
         // CreateDeliveryCacheStorageService(u64, pid) -> object<nn::bcat::detail::ipc::IDeliveryCacheStorageService>
         public ResultCode CreateDeliveryCacheStorageService(ServiceCtx context)
         {
-            long id = context.RequestData.ReadInt64();
+            // TODO: Call arp:r GetApplicationLaunchProperty with the pid to get the TitleId.
+            //       Add an instance of nn::bcat::detail::service::core::ApplicationStorageManager who load "bcat-dc-X:/" system save data,
+            //       return ResultCode.NullSaveData if failed.
+            //       Where X depend of the ApplicationLaunchProperty stored in an array (range 0-3).
+            //       Add an instance of nn::bcat::detail::service::ServiceMemoryManager.
+
+            MakeObject(context, new IDeliveryCacheStorageService(context, ApplicationLaunchProperty.GetByPid(context)));
 
-            MakeObject(context, new IDeliveryCacheStorageService());
+            // NOTE: If the IDeliveryCacheStorageService is null this error is returned, Doesn't occur in our case. 
+            //       return ResultCode.NullObject;
 
             return ResultCode.Success;
         }
diff --git a/Ryujinx.HLE/HOS/Services/Bcat/ResultCode.cs b/Ryujinx.HLE/HOS/Services/Bcat/ResultCode.cs
new file mode 100644
index 00000000..bc13d9dd
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Bcat/ResultCode.cs
@@ -0,0 +1,14 @@
+namespace Ryujinx.HLE.HOS.Services.Bcat
+{
+    enum ResultCode
+    {
+        ModuleId       = 122,
+        ErrorCodeShift = 9,
+
+        Success = 0,
+
+        NullArgument = (2  << ErrorCodeShift) | ModuleId,
+        NullSaveData = (31 << ErrorCodeShift) | ModuleId,
+        NullObject   = (91 << ErrorCodeShift) | ModuleId
+    }
+}
\ No newline at end of file