Code style fixes and nits on the HLE project (#355)

* Some style fixes and nits on ITimeZoneService

* Remove some unneeded usings

* Remove the Ryujinx.HLE.OsHle.Handles namespace

* Remove hbmenu automatic load on process exit

* Rename Ns to Device, rename Os to System, rename SystemState to State

* Move Exceptions and Utilities out of OsHle

* Rename OsHle to HOS

* Rename OsHle folder to HOS

* IManagerDisplayService and ISystemDisplayService style fixes

* BsdError shouldn't be public

* Add a empty new line before using static

* Remove unused file

* Some style fixes on NPDM

* Exit gracefully when the application is closed

* Code style fixes on IGeneralService

* Add 0x prefix on values printed as hex

* Small improvements on finalization code

* Move ProcessId and ThreadId out of AThreadState

* Rename VFs to FileSystem

* FsAccessHeader shouldn't be public. Also fix file names casing

* More case changes on NPDM

* Remove unused files

* Move using to the correct place on NPDM

* Use properties on KernelAccessControlMmio

* Address PR feedback

5 files changed, 163 insertions, 0 deletions

diff --git a/Ryujinx.HLE/Utilities/EndianSwap.cs b/Ryujinx.HLE/Utilities/EndianSwap.cs
new file mode 100644
index 00000000..d773516d
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/EndianSwap.cs
@@ -0,0 +1,17 @@
+namespace Ryujinx.HLE.Utilities
+{
+    static class EndianSwap
+    {
+        public static short Swap16(short Value) => (short)(((Value >> 8) & 0xff) | (Value << 8));
+
+        public static int Swap32(int Value)
+        {
+            uint UintVal = (uint)Value;
+
+            return (int)(((UintVal >> 24) & 0x000000ff) |
+                         ((UintVal >>  8) & 0x0000ff00) |
+                         ((UintVal <<  8) & 0x00ff0000) |
+                         ((UintVal << 24) & 0xff000000));
+        }
+    }
+}
diff --git a/Ryujinx.HLE/Utilities/IntUtils.cs b/Ryujinx.HLE/Utilities/IntUtils.cs
new file mode 100644
index 00000000..57e9d396
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/IntUtils.cs
@@ -0,0 +1,25 @@
+namespace Ryujinx.HLE.Utilities
+{
+    static class IntUtils
+    {
+        public static int AlignUp(int Value, int Size)
+        {
+            return (Value + (Size - 1)) & ~(Size - 1);
+        }
+
+        public static long AlignUp(long Value, int Size)
+        {
+            return (Value + (Size - 1)) & ~((long)Size - 1);
+        }
+
+        public static int AlignDown(int Value, int Size)
+        {
+            return Value & ~(Size - 1);
+        }
+
+        public static long AlignDown(long Value, int Size)
+        {
+            return Value & ~((long)Size - 1);
+        }
+    }
+}
diff --git a/Ryujinx.HLE/Utilities/StringUtils.cs b/Ryujinx.HLE/Utilities/StringUtils.cs
new file mode 100644
index 00000000..e8d6550a
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/StringUtils.cs
@@ -0,0 +1,51 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+
+namespace Ryujinx.HLE.Utilities
+{
+    static class StringUtils
+    {
+        public static byte[] GetFixedLengthBytes(string InputString, int Size, Encoding Encoding)
+        {
+            InputString = InputString + "\0";
+
+            int BytesCount = Encoding.GetByteCount(InputString);
+
+            byte[] Output = new byte[Size];
+
+            if (BytesCount < Size)
+            {
+                Encoding.GetBytes(InputString, 0, InputString.Length, Output, 0);
+            }
+            else
+            {
+                int NullSize = Encoding.GetByteCount("\0");
+
+                Output = Encoding.GetBytes(InputString);
+
+                Array.Resize(ref Output, Size - NullSize);
+
+                Output = Output.Concat(Encoding.GetBytes("\0")).ToArray();
+            }
+
+            return Output;
+        }
+
+        public static byte[] HexToBytes(string HexString)
+        {
+            //Ignore last charactor if HexLength % 2 != 0.
+            int BytesInHex = HexString.Length / 2;
+
+            byte[] Output = new byte[BytesInHex];
+
+            for (int Index = 0; Index < BytesInHex; Index++)
+            {
+                Output[Index] = byte.Parse(HexString.Substring(Index * 2, 2), NumberStyles.HexNumber);
+            }
+
+            return Output;
+        }
+    }
+}
diff --git a/Ryujinx.HLE/Utilities/StructReader.cs b/Ryujinx.HLE/Utilities/StructReader.cs
new file mode 100644
index 00000000..6e942a9b
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/StructReader.cs
@@ -0,0 +1,45 @@
+using ChocolArm64.Memory;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.Utilities
+{
+    class StructReader
+    {
+        private AMemory Memory;
+
+        public long Position { get; private set; }
+
+        public StructReader(AMemory Memory, long Position)
+        {
+            this.Memory   = Memory;
+            this.Position = Position;
+        }
+
+        public T Read<T>() where T : struct
+        {
+            T Value = AMemoryHelper.Read<T>(Memory, Position);
+
+            Position += Marshal.SizeOf<T>();
+
+            return Value;
+        }
+
+        public T[] Read<T>(int Size) where T : struct
+        {
+            int StructSize = Marshal.SizeOf<T>();
+
+            int Count = Size / StructSize;
+
+            T[] Output = new T[Count];
+
+            for (int Index = 0; Index < Count; Index++)
+            {
+                Output[Index] = AMemoryHelper.Read<T>(Memory, Position);
+
+                Position += StructSize;
+            }
+
+            return Output;
+        }
+    }
+}
diff --git a/Ryujinx.HLE/Utilities/StructWriter.cs b/Ryujinx.HLE/Utilities/StructWriter.cs
new file mode 100644
index 00000000..8b88105c
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/StructWriter.cs
@@ -0,0 +1,25 @@
+using ChocolArm64.Memory;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.Utilities
+{
+    class StructWriter
+    {
+        private AMemory Memory;
+
+        public long Position { get; private set; }
+
+        public StructWriter(AMemory Memory, long Position)
+        {
+            this.Memory   = Memory;
+            this.Position = Position;
+        }
+
+        public void Write<T>(T Value) where T : struct
+        {
+            AMemoryHelper.Write(Memory, Position, Value);
+
+            Position += Marshal.SizeOf<T>();
+        }
+    }
+}