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+/*
+ * Copyright © 2018 Adobe 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.
+ *
+ * Adobe Author(s): Michiharu Ariza
+ */
+#ifndef HB_CFF_INTERP_DICT_COMMON_HH
+#define HB_CFF_INTERP_DICT_COMMON_HH
+
+#include "hb-cff-interp-common.hh"
+
+namespace CFF {
+
+using namespace OT;
+
+/* an opstr and the parsed out dict value(s) */
+struct dict_val_t : op_str_t
+{
+ void init () {}
+ void fini () {}
+};
+
+typedef dict_val_t num_dict_val_t;
+
+template <typename VAL> struct dict_values_t : parsed_values_t<VAL> {};
+
+template <typename OPSTR=op_str_t>
+struct top_dict_values_t : dict_values_t<OPSTR>
+{
+ void init ()
+ {
+ dict_values_t<OPSTR>::init ();
+ charStringsOffset = 0;
+ FDArrayOffset = 0;
+ }
+ void fini () { dict_values_t<OPSTR>::fini (); }
+
+ unsigned int charStringsOffset;
+ unsigned int FDArrayOffset;
+};
+
+struct dict_opset_t : opset_t<number_t>
+{
+ static void process_op (op_code_t op, interp_env_t<number_t>& env)
+ {
+ switch (op) {
+ case OpCode_longintdict: /* 5-byte integer */
+ env.argStack.push_longint_from_substr (env.str_ref);
+ break;
+
+ case OpCode_BCD: /* real number */
+ env.argStack.push_real (parse_bcd (env.str_ref));
+ break;
+
+ default:
+ opset_t<number_t>::process_op (op, env);
+ break;
+ }
+ }
+
+ /* Turns CFF's BCD format into strtod understandable string */
+ static double parse_bcd (byte_str_ref_t& str_ref)
+ {
+ if (unlikely (str_ref.in_error ())) return .0;
+
+ enum Nibble { DECIMAL=10, EXP_POS, EXP_NEG, RESERVED, NEG, END };
+
+ char buf[32];
+ unsigned char byte = 0;
+ for (unsigned i = 0, count = 0; count < ARRAY_LENGTH (buf); ++i, ++count)
+ {
+ unsigned nibble;
+ if (!(i & 1))
+ {
+ if (unlikely (!str_ref.avail ())) break;
+
+ byte = str_ref[0];
+ str_ref.inc ();
+ nibble = byte >> 4;
+ }
+ else
+ nibble = byte & 0x0F;
+
+ if (unlikely (nibble == RESERVED)) break;
+ else if (nibble == END)
+ {
+ const char *p = buf;
+ double pv;
+ if (unlikely (!hb_parse_double (&p, p + count, &pv, true/* whole buffer */)))
+ break;
+ return pv;
+ }
+ else
+ {
+ buf[count] = "0123456789.EE?-?"[nibble];
+ if (nibble == EXP_NEG)
+ {
+ ++count;
+ if (unlikely (count == ARRAY_LENGTH (buf))) break;
+ buf[count] = '-';
+ }
+ }
+ }
+
+ str_ref.set_error ();
+ return .0;
+ }
+
+ static bool is_hint_op (op_code_t op)
+ {
+ switch (op)
+ {
+ case OpCode_BlueValues:
+ case OpCode_OtherBlues:
+ case OpCode_FamilyBlues:
+ case OpCode_FamilyOtherBlues:
+ case OpCode_StemSnapH:
+ case OpCode_StemSnapV:
+ case OpCode_StdHW:
+ case OpCode_StdVW:
+ case OpCode_BlueScale:
+ case OpCode_BlueShift:
+ case OpCode_BlueFuzz:
+ case OpCode_ForceBold:
+ case OpCode_LanguageGroup:
+ case OpCode_ExpansionFactor:
+ return true;
+ default:
+ return false;
+ }
+ }
+};
+
+template <typename VAL=op_str_t>
+struct top_dict_opset_t : dict_opset_t
+{
+ static void process_op (op_code_t op, interp_env_t<number_t>& env, top_dict_values_t<VAL> & dictval)
+ {
+ switch (op) {
+ case OpCode_CharStrings:
+ dictval.charStringsOffset = env.argStack.pop_uint ();
+ env.clear_args ();
+ break;
+ case OpCode_FDArray:
+ dictval.FDArrayOffset = env.argStack.pop_uint ();
+ env.clear_args ();
+ break;
+ case OpCode_FontMatrix:
+ env.clear_args ();
+ break;
+ default:
+ dict_opset_t::process_op (op, env);
+ break;
+ }
+ }
+};
+
+template <typename OPSET, typename PARAM, typename ENV=num_interp_env_t>
+struct dict_interpreter_t : interpreter_t<ENV>
+{
+ dict_interpreter_t (ENV& env_) : interpreter_t<ENV> (env_) {}
+
+ bool interpret (PARAM& param)
+ {
+ param.init ();
+ while (SUPER::env.str_ref.avail ())
+ {
+ OPSET::process_op (SUPER::env.fetch_op (), SUPER::env, param);
+ if (unlikely (SUPER::env.in_error ()))
+ return false;
+ }
+
+ return true;
+ }
+
+ private:
+ typedef interpreter_t<ENV> SUPER;
+};
+
+} /* namespace CFF */
+
+#endif /* HB_CFF_INTERP_DICT_COMMON_HH */