Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/symbols/pdb/Microsoft.Cci.Pdb/PdbReader.cs

@@ -0,0 +1,40 @@
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) Microsoft. All rights reserved.
+// This code is licensed under the Microsoft Public License.
+// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
+// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
+// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
+//
+//-----------------------------------------------------------------------------
+using System;
+using System.IO;
+
+namespace Microsoft.Cci.Pdb {
+  internal class PdbReader {
+    internal PdbReader(Stream reader, int pageSize) {
+      this.pageSize = pageSize;
+      this.reader = reader;
+    }
+
+    internal void Seek(int page, int offset) {
+      reader.Seek(page * pageSize + offset, SeekOrigin.Begin);
+    }
+
+    internal void Read(byte[] bytes, int offset, int count) {
+      reader.Read(bytes, offset, count);
+    }
+
+    internal int PagesFromSize(int size) {
+      return (size + pageSize - 1) / (pageSize);
+    }
+
+    //internal int PageSize {
+    //  get { return pageSize; }
+    //}
+
+    internal readonly int pageSize;
+    internal readonly Stream reader;
+  }
+}