Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil.PE/TextMap.cs

@@ -0,0 +1,112 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+
+#if !READ_ONLY
+
+using RVA = System.UInt32;
+
+namespace Mono.Cecil.PE {
+
+	enum TextSegment {
+		ImportAddressTable,
+		CLIHeader,
+		Code,
+		Resources,
+		Data,
+		StrongNameSignature,
+
+		// Metadata
+		MetadataHeader,
+		TableHeap,
+		StringHeap,
+		UserStringHeap,
+		GuidHeap,
+		BlobHeap,
+		PdbHeap,
+		// End Metadata
+
+		DebugDirectory,
+		ImportDirectory,
+		ImportHintNameTable,
+		StartupStub,
+	}
+
+	sealed class TextMap {
+
+		readonly Range [] map = new Range [17 /*Enum.GetValues (typeof (TextSegment)).Length*/];
+
+		public void AddMap (TextSegment segment, int length)
+		{
+			map [(int) segment] = new Range (GetStart (segment), (uint) length);
+		}
+
+		public void AddMap (TextSegment segment, int length, int align)
+		{
+			align--;
+
+			AddMap (segment, (length + align) & ~align);
+		}
+
+		public void AddMap (TextSegment segment, Range range)
+		{
+			map [(int) segment] = range;
+		}
+
+		public Range GetRange (TextSegment segment)
+		{
+			return map [(int) segment];
+		}
+
+		public DataDirectory GetDataDirectory (TextSegment segment)
+		{
+			var range = map [(int) segment];
+
+			return new DataDirectory (range.Length == 0 ? 0 : range.Start, range.Length);
+		}
+
+		public RVA GetRVA (TextSegment segment)
+		{
+			return map [(int) segment].Start;
+		}
+
+		public RVA GetNextRVA (TextSegment segment)
+		{
+			var i = (int) segment;
+			return map [i].Start + map [i].Length;
+		}
+
+		public int GetLength (TextSegment segment)
+		{
+			return (int) map [(int) segment].Length;
+		}
+
+		RVA GetStart (TextSegment segment)
+		{
+			var index = (int) segment;
+			return index == 0 ? ImageWriter.text_rva : ComputeStart (index);
+		}
+
+		RVA ComputeStart (int index)
+		{
+			index--;
+			return map [index].Start + map [index].Length;
+		}
+
+		public uint GetLength ()
+		{
+			var range = map [(int) TextSegment.StartupStub];
+			return range.Start - ImageWriter.text_rva + range.Length;
+		}
+	}
+}
+
+#endif