1 files changed, 9 insertions, 0 deletions
diff --git a/include/llvm/Support/BinaryStreamReader.h b/include/llvm/Support/BinaryStreamReader.h
index 738c042add3e3..ae5ebb2c36286 100644
--- a/include/llvm/Support/BinaryStreamReader.h
+++ b/include/llvm/Support/BinaryStreamReader.h
@@ -137,6 +137,15 @@ public:
   /// returns an appropriate error code.
   Error readStreamRef(BinaryStreamRef &Ref, uint32_t Length);
 
+  /// Read \p Length bytes from the underlying stream into \p Stream.  This is
+  /// equivalent to calling getUnderlyingStream().slice(Offset, Length).
+  /// Updates the stream's offset to point after the newly read object.  Never
+  /// causes a copy.
+  ///
+  /// \returns a success error code if the data was successfully read, otherwise
+  /// returns an appropriate error code.
+  Error readSubstream(BinarySubstreamRef &Stream, uint32_t Size);
+
   /// Get a pointer to an object of type T from the underlying stream, as if by
   /// memcpy, and store the result into \p Dest.  It is up to the caller to
   /// ensure that objects of type T can be safely treated in this manner.