Revert "Simplified the C# marshalling of Boolean fields."

This reverts commit dc270ef2a8.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -216,6 +216,14 @@ namespace CppSharp.Generators.CSharp
                     goto default;
                 case PrimitiveType.Char16:
                     return false;
+                case PrimitiveType.Bool:
+                    if (Context.MarshalKind == MarshalKind.NativeField)
+                    {
+                        // returned structs must be blittable and bool isn't
+                        Context.Return.Write("{0} != 0", Context.ReturnVarName);
+                        return true;
+                    }
+                    goto default;
                 default:
                     Context.Return.Write(Context.ReturnVarName);
                     return true;
@@ -641,6 +649,14 @@ namespace CppSharp.Generators.CSharp
                     goto default;
                 case PrimitiveType.Char16:
                     return false;
+                case PrimitiveType.Bool:
+                    if (Context.MarshalKind == MarshalKind.NativeField)
+                    {
+                        // returned structs must be blittable and bool isn't
+                        Context.Return.Write("(byte) ({0} ? 1 : 0)", Context.Parameter.Name);
+                        return true;
+                    }
+                    goto default;
                 default:
                     Context.Return.Write(Context.Parameter.Name);
                     return true;

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -612,13 +612,19 @@ namespace CppSharp.Generators.CSharp
 
         private void GenerateClassInternalsField(LayoutField field, Class @class)
         {
+            Declaration decl;
+            field.QualifiedType.Type.TryGetDeclaration(out decl);
+
+            var arrayType = field.QualifiedType.Type.Desugar() as ArrayType;
+            var coreType = field.QualifiedType.Type.Desugar();
+            if (arrayType != null && arrayType.SizeType == ArrayType.ArraySize.Constant)
+                coreType = arrayType.Type.Desugar();
+
             TypePrinterResult retType = TypePrinter.VisitFieldDecl(
                 new Field { Name = field.Name, QualifiedType = field.QualifiedType });
 
             PushBlock(BlockKind.Field);
 
-            if (field.QualifiedType.Type.Desugar().IsPrimitiveType(PrimitiveType.Bool))
-                WriteLine("[MarshalAs(UnmanagedType.I1)]");
             if (!Options.GenerateSequentialLayout || @class.IsUnion)
                 WriteLine($"[FieldOffset({field.Offset})]");
             Write($"internal {retType}{retType.NameSuffix}");

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -494,7 +494,10 @@ namespace CppSharp.Generators.CSharp
         {
             switch (primitive)
             {
-                case PrimitiveType.Bool: return "bool";
+                case PrimitiveType.Bool:
+                    // returned structs must be blittable and bool isn't
+                    return MarshalKind == MarshalKind.NativeField ?
+                        "byte" : "bool";
                 case PrimitiveType.Void: return "void";
                 case PrimitiveType.Char16:
                 case PrimitiveType.Char32: