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diff --git a/src/hb-ot-shape-complex-khmer-private.hh b/src/hb-ot-shape-complex-khmer-private.hh
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+/*
+ * Copyright © 2018  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH
+#define HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-ot-shape-complex-indic-private.hh"
+
+
+/* buffer var allocations */
+#define khmer_category() indic_category() /* khmer_category_t */
+#define khmer_position() indic_position() /* khmer_position_t */
+
+
+typedef indic_category_t khmer_category_t;
+typedef indic_position_t khmer_position_t;
+
+
+static inline khmer_position_t
+matra_position_khmer (khmer_position_t side)
+{
+  switch ((int) side)
+  {
+    case POS_PRE_C:
+      return POS_PRE_M;
+
+    case POS_POST_C:
+    case POS_ABOVE_C:
+    case POS_BELOW_C:
+      return POS_AFTER_POST;
+
+    default:
+      return side;
+  };
+}
+
+static inline bool
+is_consonant_or_vowel (const hb_glyph_info_t &info)
+{
+  return is_one_of (info, CONSONANT_FLAGS | FLAG (OT_V));
+}
+
+static inline bool
+is_coeng (const hb_glyph_info_t &info)
+{
+  return is_one_of (info, FLAG (OT_Coeng));
+}
+
+static inline void
+set_khmer_properties (hb_glyph_info_t &info)
+{
+  hb_codepoint_t u = info.codepoint;
+  unsigned int type = hb_indic_get_categories (u);
+  khmer_category_t cat = (khmer_category_t) (type & 0x7Fu);
+  khmer_position_t pos = (khmer_position_t) (type >> 8);
+
+
+  /*
+   * Re-assign category
+   */
+
+  if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */
+  else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x17CDu, 0x17D1u) ||
+		     u == 0x17CBu || u == 0x17D3u || u == 0x17DDu)) /* Khmer Various signs */
+  {
+    /* These can occur mid-syllable (eg. before matras), even though Unicode marks them as Syllable_Modifier.
+     * https://github.com/roozbehp/unicode-data/issues/5 */
+    cat = OT_M;
+    pos = POS_ABOVE_C;
+  }
+  else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x2010u, 0x2011u))) cat = OT_PLACEHOLDER;
+  else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE;
+
+
+  /*
+   * Re-assign position.
+   */
+
+  if ((FLAG_UNSAFE (cat) & CONSONANT_FLAGS))
+  {
+    pos = POS_BASE_C;
+    if (u == 0x179Au)
+      cat = OT_Ra;
+  }
+  else if (cat == OT_M)
+  {
+    pos = matra_position_khmer (pos);
+  }
+  else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) | FLAG (OT_A) | FLAG (OT_Symbol))))
+  {
+    pos = POS_SMVD;
+  }
+
+  info.khmer_category() = cat;
+  info.khmer_position() = pos;
+}
+
+
+#endif /* HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH */