Added Module.__ReadDataFromRVA() to make it more convenient to read data based on rva.

reflect/Module.cs

@@ -207,6 +207,11 @@ namespace IKVM.Reflection
 			throw new NotSupportedException();
 		}
 
+		public virtual int __ReadDataFromRVA(int rva, byte[] data, int offset, int length)
+		{
+			throw new NotSupportedException();
+		}
+
 		public virtual void GetPEKind(out PortableExecutableKinds peKind, out ImageFileMachine machine)
 		{
 			throw new NotSupportedException();

reflect/Reader/Field.cs

@@ -87,18 +87,7 @@ namespace IKVM.Reflection.Reader
 				Array.Clear(data, offset, length);
 				return;
 			}
-			module.SeekRVA(rva);
-			while (length > 0)
-			{
-				int read = module.stream.Read(data, offset, length);
-				if (read == 0)
-				{
-					// C++ assemblies can have fields that have an RVA that lies outside of the file
-					break;
-				}
-				offset += read;
-				length -= read;
-			}
+			module.__ReadDataFromRVA(rva, data, offset, length);
 		}
 
 		public override int __FieldRVA

reflect/Reader/ModuleReader.cs

@@ -1044,6 +1044,25 @@ namespace IKVM.Reflection.Reader
 			return peFile.GetSectionInfo(rva, out name, out characteristics);
 		}
 
+		public override int __ReadDataFromRVA(int rva, byte[] data, int offset, int length)
+		{
+			SeekRVA(rva);
+			int totalBytesRead = 0;
+			while (length > 0)
+			{
+				int read = stream.Read(data, offset, length);
+				if (read == 0)
+				{
+					// C++ assemblies can have fields that have an RVA that lies outside of the file
+					break;
+				}
+				offset += read;
+				length -= read;
+				totalBytesRead += read;
+			}
+			return totalBytesRead;
+		}
+
 		public override void GetPEKind(out PortableExecutableKinds peKind, out ImageFileMachine machine)
 		{
 			peKind = 0;