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diff --git a/gprofng/src/Data_window.h b/gprofng/src/Data_window.h
new file mode 100644
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+/* Copyright (C) 2021 Free Software Foundation, Inc.
+   Contributed by Oracle.
+
+   This file is part of GNU Binutils.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#ifndef _DATA_WINDOW_H
+#define _DATA_WINDOW_H
+
+// The Data_window class hiearchy is used to access raw data in the
+// experiment record.
+//
+// The Data_window base class implements a set of windows into a raw data file.
+// It is responsible for mapping and unmapping regions of the file as
+// requested by other levels inside of the DBE.
+
+#include "util.h"
+
+class Data_window
+{
+public:
+
+  // Span in data file
+  typedef struct
+  {
+    int64_t offset; // file offset
+    int64_t length; // span length
+  } Span;
+
+  Data_window (char *filename);
+  ~Data_window ();
+
+  // Return address of "offset" byte of window for "length" bytes.
+  // Return 0 on error or locked.
+  void *bind (Span *span, int64_t minSize);
+  void *bind (int64_t file_offset, int64_t minSize);
+  void *get_data (int64_t offset, int64_t size, void *datap);
+  int64_t get_buf_size ();
+  int64_t copy_to_file (int f, int64_t offset, int64_t size);
+
+  bool not_opened ()            { return !opened; }
+  off64_t get_fsize ()          { return fsize; }
+
+  template <typename Key_t> inline Key_t
+  get_align_val (Key_t *vp)
+  {
+    if (sizeof (Key_t) <= sizeof (int))
+      return *vp;
+    // 64-bit value can have a wrong alignment
+    Key_t val = (Key_t) 0;
+    uint32_t *p1 = (uint32_t *) vp;
+    uint32_t *p2 = (uint32_t*) (&val);
+    p2[0] = p1[0];
+    p2[1] = p1[1];
+    return val;
+  }
+
+  template <typename Key_t> inline Key_t
+  decode (Key_t &v)
+  {
+    Key_t val = get_align_val (&v);
+    if (need_swap_endian)
+      swapByteOrder (&val, sizeof (val));
+    return val;
+  }
+
+  bool need_swap_endian;
+  char *fname;          // file name
+
+protected:
+  int fd;               // file descriptor
+  bool mmap_on_file;
+
+private:
+  long page_size;       // used in mmap()
+  bool use_mmap;
+  bool opened;
+  int64_t fsize;        // file size
+  void *base;           // current window
+  int64_t woffset;      // offset of current window
+  int64_t wsize;        // size of current window
+  int64_t basesize;     // size of allocated window
+};
+
+#endif /* _DATA_WINDOW_H */