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

1 files changed, 41 insertions, 1 deletions

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