--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/DebugInfo/PDB/Native/InjectedSourceStream.cpp	Wed Aug 14 16:55:33 2019 +0900
@@ -0,0 +1,65 @@
+//===- InjectedSourceStream.cpp - PDB Headerblock Stream Access -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/Native/InjectedSourceStream.h"
+
+#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
+#include "llvm/DebugInfo/PDB/Native/Hash.h"
+#include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
+#include "llvm/DebugInfo/PDB/Native/RawConstants.h"
+#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/Endian.h"
+
+using namespace llvm;
+using namespace llvm::msf;
+using namespace llvm::support;
+using namespace llvm::pdb;
+
+InjectedSourceStream::InjectedSourceStream(
+    std::unique_ptr<MappedBlockStream> Stream)
+    : Stream(std::move(Stream)) {}
+
+Error InjectedSourceStream::reload(const PDBStringTable &Strings) {
+  BinaryStreamReader Reader(*Stream);
+
+  if (auto EC = Reader.readObject(Header))
+    return EC;
+
+  if (Header->Version !=
+      static_cast<uint32_t>(PdbRaw_SrcHeaderBlockVer::SrcVerOne))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Invalid headerblock header version");
+
+  if (auto EC = InjectedSourceTable.load(Reader))
+    return EC;
+
+  for (const auto& Entry : *this) {
+    if (Entry.second.Size != sizeof(SrcHeaderBlockEntry))
+      return make_error<RawError>(raw_error_code::corrupt_file,
+                                  "Invalid headerbock entry size");
+    if (Entry.second.Version !=
+        static_cast<uint32_t>(PdbRaw_SrcHeaderBlockVer::SrcVerOne))
+      return make_error<RawError>(raw_error_code::corrupt_file,
+                                  "Invalid headerbock entry version");
+
+    // Check that all name references are valid.
+    auto Name = Strings.getStringForID(Entry.second.FileNI);
+    if (!Name)
+      return Name.takeError();
+    auto ObjName = Strings.getStringForID(Entry.second.ObjNI);
+    if (!ObjName)
+      return ObjName.takeError();
+    auto VName = Strings.getStringForID(Entry.second.VFileNI);
+    if (!VName)
+      return VName.takeError();
+  }
+
+  assert(Reader.bytesRemaining() == 0);
+  return Error::success();
+}