1 files changed, 58 insertions, 0 deletions
diff --git a/include/llvm/DebugInfo/CodeView/ByteStream.h b/include/llvm/DebugInfo/CodeView/ByteStream.h
new file mode 100644
index 0000000000000..f398c93723e7a
--- /dev/null
+++ b/include/llvm/DebugInfo/CodeView/ByteStream.h
@@ -0,0 +1,58 @@
+//===- ByteStream.h - Reads stream data from a byte sequence ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_CODEVIEW_BYTESTREAM_H
+#define LLVM_DEBUGINFO_CODEVIEW_BYTESTREAM_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/CodeView/StreamInterface.h"
+#include "llvm/Support/Error.h"
+#include <cstdint>
+#include <memory>
+#include <type_traits>
+
+namespace llvm {
+namespace codeview {
+class StreamReader;
+
+template <bool Writable = false> class ByteStream : public StreamInterface {
+  typedef typename std::conditional<Writable, MutableArrayRef<uint8_t>,
+                                    ArrayRef<uint8_t>>::type ArrayType;
+
+public:
+  ByteStream() {}
+  explicit ByteStream(ArrayType Data) : Data(Data) {}
+  ~ByteStream() override {}
+
+  Error readBytes(uint32_t Offset, uint32_t Size,
+                  ArrayRef<uint8_t> &Buffer) const override;
+  Error readLongestContiguousChunk(uint32_t Offset,
+                                   ArrayRef<uint8_t> &Buffer) const override;
+
+  Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Buffer) const override;
+
+  uint32_t getLength() const override;
+
+  Error commit() const override;
+
+  ArrayRef<uint8_t> data() const { return Data; }
+  StringRef str() const;
+
+private:
+  ArrayType Data;
+};
+
+extern template class ByteStream<true>;
+extern template class ByteStream<false>;
+
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_BYTESTREAM_H