1 files changed, 60 insertions, 0 deletions
diff --git a/llvm/lib/DebugInfo/PDB/Raw/ByteStream.cpp b/llvm/lib/DebugInfo/PDB/Raw/ByteStream.cpp
new file mode 100644
index 00000000000..20abe4c0d97
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/Raw/ByteStream.cpp
@@ -0,0 +1,60 @@
+//===- ByteStream.cpp - Reads stream data from a byte sequence ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/Raw/ByteStream.h"
+#include "llvm/DebugInfo/PDB/Raw/StreamReader.h"
+
+using namespace llvm;
+
+ByteStream::ByteStream() : Owned(false) {}
+
+ByteStream::ByteStream(MutableArrayRef<uint8_t> Bytes) : Owned(false) {
+  initialize(Bytes);
+}
+
+ByteStream::ByteStream(uint32_t Length) : Owned(false) { initialize(Length); }
+
+ByteStream::~ByteStream() { reset(); }
+
+void ByteStream::reset() {
+  if (Owned)
+    delete[] Data.data();
+  Owned = false;
+  Data = MutableArrayRef<uint8_t>();
+}
+
+void ByteStream::initialize(MutableArrayRef<uint8_t> Bytes) {
+  reset();
+  Data = Bytes;
+  Owned = false;
+}
+
+void ByteStream::initialize(uint32_t Length) {
+  reset();
+  Data = MutableArrayRef<uint8_t>(new uint8_t[Length], Length);
+  Owned = true;
+}
+
+std::error_code ByteStream::initialize(StreamReader &Reader, uint32_t Length) {
+  initialize(Length);
+  std::error_code EC = Reader.readBytes(Data);
+  if (EC)
+    reset();
+  return EC;
+}
+
+std::error_code ByteStream::readBytes(uint32_t Offset,
+                                      MutableArrayRef<uint8_t> Buffer) const {
+  if (Data.size() < Buffer.size() + Offset)
+    return std::make_error_code(std::errc::bad_address);
+  ::memcpy(Buffer.data(), Data.data() + Offset, Buffer.size());
+  return std::error_code();
+}
+
+uint32_t ByteStream::getLength() const { return Data.size(); }