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+/*
+ * Copyright © 2021 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.
+ *
+ */
+
+#ifndef HB_OT_VAR_COMMON_HH
+#define HB_OT_VAR_COMMON_HH
+
+#include "hb-ot-layout-common.hh"
+
+
+namespace OT {
+
+struct DeltaSetIndexMapFormat0
+{
+ friend struct DeltaSetIndexMap;
+
+ private:
+ DeltaSetIndexMapFormat0* copy (hb_serialize_context_t *c) const
+ {
+ TRACE_SERIALIZE (this);
+ auto *out = c->start_embed (this);
+ if (unlikely (!out)) return_trace (nullptr);
+
+ unsigned total_size = min_size + mapCount * get_width ();
+ HBUINT8 *p = c->allocate_size<HBUINT8> (total_size);
+ if (unlikely (!p)) return_trace (nullptr);
+
+ memcpy (p, this, HBUINT8::static_size * total_size);
+ return_trace (out);
+ }
+
+ template <typename T>
+ bool serialize (hb_serialize_context_t *c, const T &plan)
+ {
+ unsigned int width = plan.get_width ();
+ unsigned int inner_bit_count = plan.get_inner_bit_count ();
+ const hb_array_t<const uint32_t> output_map = plan.get_output_map ();
+
+ TRACE_SERIALIZE (this);
+ if (unlikely (output_map.length && ((((inner_bit_count-1)&~0xF)!=0) || (((width-1)&~0x3)!=0))))
+ return_trace (false);
+ if (unlikely (!c->extend_min (this))) return_trace (false);
+
+ entryFormat = ((width-1)<<4)|(inner_bit_count-1);
+ mapCount = output_map.length;
+ HBUINT8 *p = c->allocate_size<HBUINT8> (width * output_map.length);
+ if (unlikely (!p)) return_trace (false);
+ for (unsigned int i = 0; i < output_map.length; i++)
+ {
+ unsigned int v = output_map[i];
+ unsigned int outer = v >> 16;
+ unsigned int inner = v & 0xFFFF;
+ unsigned int u = (outer << inner_bit_count) | inner;
+ for (unsigned int w = width; w > 0;)
+ {
+ p[--w] = u;
+ u >>= 8;
+ }
+ p += width;
+ }
+ return_trace (true);
+ }
+
+ uint32_t map (unsigned int v) const /* Returns 16.16 outer.inner. */
+ {
+ /* If count is zero, pass value unchanged. This takes
+ * care of direct mapping for advance map. */
+ if (!mapCount)
+ return v;
+
+ if (v >= mapCount)
+ v = mapCount - 1;
+
+ unsigned int u = 0;
+ { /* Fetch it. */
+ unsigned int w = get_width ();
+ const HBUINT8 *p = mapDataZ.arrayZ + w * v;
+ for (; w; w--)
+ u = (u << 8) + *p++;
+ }
+
+ { /* Repack it. */
+ unsigned int n = get_inner_bit_count ();
+ unsigned int outer = u >> n;
+ unsigned int inner = u & ((1 << n) - 1);
+ u = (outer<<16) | inner;
+ }
+
+ return u;
+ }
+
+ unsigned get_map_count () const { return mapCount; }
+ unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; }
+ unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; }
+
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ c->check_range (mapDataZ.arrayZ,
+ mapCount,
+ get_width ()));
+ }
+
+ protected:
+ HBUINT8 format; /* Format identifier--format = 0 */
+ HBUINT8 entryFormat; /* A packed field that describes the compressed
+ * representation of delta-set indices. */
+ HBUINT16 mapCount; /* The number of mapping entries. */
+ UnsizedArrayOf<HBUINT8>
+ mapDataZ; /* The delta-set index mapping data. */
+
+ public:
+ DEFINE_SIZE_ARRAY (4, mapDataZ);
+};
+
+struct DeltaSetIndexMapFormat1
+{
+ friend struct DeltaSetIndexMap;
+
+ private:
+ DeltaSetIndexMapFormat1* copy (hb_serialize_context_t *c) const
+ {
+ TRACE_SERIALIZE (this);
+ auto *out = c->start_embed (this);
+ if (unlikely (!out)) return_trace (nullptr);
+
+ unsigned total_size = min_size + mapCount * get_width ();
+ HBUINT8 *p = c->allocate_size<HBUINT8> (total_size);
+ if (unlikely (!p)) return_trace (nullptr);
+
+ memcpy (p, this, HBUINT8::static_size * total_size);
+ return_trace (out);
+ }
+
+ unsigned get_map_count () const { return mapCount; }
+ unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; }
+ unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ c->check_range (mapDataZ.arrayZ,
+ mapCount,
+ get_width ()));
+ }
+
+ protected:
+ HBUINT8 format; /* Format identifier--format = 1 */
+ HBUINT8 entryFormat; /* A packed field that describes the compressed
+ * representation of delta-set indices. */
+ HBUINT32 mapCount; /* The number of mapping entries. */
+ UnsizedArrayOf<HBUINT8>
+ mapDataZ; /* The delta-set index mapping data. */
+
+ public:
+ DEFINE_SIZE_ARRAY (6, mapDataZ);
+};
+
+struct DeltaSetIndexMap
+{
+ template <typename T>
+ bool serialize (hb_serialize_context_t *c, const T &plan)
+ {
+ TRACE_SERIALIZE (this);
+ switch (u.format) {
+ case 0: return_trace (u.format0.serialize (c, plan));
+ default:return_trace (false);
+ }
+ }
+
+ uint32_t map (unsigned v) const
+ {
+ switch (u.format) {
+ case 0: return (u.format0.map (v));
+ default:return v;
+ }
+ }
+
+ unsigned get_map_count () const
+ {
+ switch (u.format) {
+ case 0: return u.format0.get_map_count ();
+ case 1: return u.format1.get_map_count ();
+ default:return 0;
+ }
+ }
+
+ unsigned get_width () const
+ {
+ switch (u.format) {
+ case 0: return u.format0.get_width ();
+ case 1: return u.format1.get_width ();
+ default:return 0;
+ }
+ }
+
+ unsigned get_inner_bit_count () const
+ {
+ switch (u.format) {
+ case 0: return u.format0.get_inner_bit_count ();
+ case 1: return u.format1.get_inner_bit_count ();
+ default:return 0;
+ }
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!u.format.sanitize (c)) return_trace (false);
+ switch (u.format) {
+ case 0: return_trace (u.format0.sanitize (c));
+ case 1: return_trace (u.format1.sanitize (c));
+ default:return_trace (true);
+ }
+ }
+
+ DeltaSetIndexMap* copy (hb_serialize_context_t *c) const
+ {
+ TRACE_SERIALIZE (this);
+ switch (u.format) {
+ case 0: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format0.copy (c)));
+ case 1: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format1.copy (c)));
+ default:return_trace (nullptr);
+ }
+ }
+
+ protected:
+ union {
+ HBUINT8 format; /* Format identifier */
+ DeltaSetIndexMapFormat0 format0;
+ DeltaSetIndexMapFormat1 format1;
+ } u;
+ public:
+ DEFINE_SIZE_UNION (1, format);
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_VAR_COMMON_HH */
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