[var] Stub implementation of avar table

diff --git a/src/hb-ot-var-avar-table.hh b/src/hb-ot-var-avar-table.hh
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+++ b/src/hb-ot-var-avar-table.hh
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+/*
+ * Copyright © 2017  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_VAR_AVAR_TABLE_HH
+#define HB_OT_VAR_AVAR_TABLE_HH
+
+#include "hb-open-type-private.hh"
+#include "hb-ot-var.h"
+
+namespace OT {
+
+
+struct AxisValueMap
+{
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this));
+  }
+
+  public:
+  F2DOT14      fromCoord;      /* A normalized coordinate value obtained using
+                                * default normalization. */
+  F2DOT14      toCoord;        /* The modified, normalized coordinate value. */
+
+  public:
+  DEFINE_SIZE_STATIC (4);
+};
+
+typedef ArrayOf<AxisValueMap> SegmentMaps;
+
+/*
+ * avar — Axis Variations Table
+ */
+
+struct avar
+{
+  static const hb_tag_t tableTag       = HB_OT_TAG_avar;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    if (unlikely (!(version.sanitize (c) &&
+                   version.major == 1 &&
+                   c->check_struct (this))))
+      return_trace (false);
+
+    const SegmentMaps *map = &axisSegmentMapsZ;
+    unsigned int count = axisCount;
+    for (unsigned int i = 0; i < count; i++)
+    {
+      if (unlikely (!map->sanitize (c)))
+        return_trace (false);
+      map = &StructAfter<SegmentMaps> (*map);
+    }
+
+    return_trace (true);
+  }
+
+  protected:
+  FixedVersion<>version;       /* Version of the avar table
+                                * initially set to 0x00010000u */
+  USHORT       reserved;       /* This field is permanently reserved. Set to 0. */
+  USHORT       axisCount;      /* The number of variation axes in the font. This
+                                * must be the same number as axisCount in the
+                                * 'fvar' table. */
+  SegmentMaps  axisSegmentMapsZ;
+
+  public:
+  DEFINE_SIZE_MIN (8);
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_VAR_AVAR_TABLE_HH */