2 * Copyright © 2018 Adobe Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Adobe Author(s): Michiharu Ariza
26 #ifndef HB_CFF_INTERP_DICT_COMMON_HH
27 #define HB_CFF_INTERP_DICT_COMMON_HH
29 #include "hb-cff-interp-common.hh"
37 /* an opstr and the parsed out dict value(s) */
38 struct dict_val_t : op_str_t
40 void init () { single_val.set_int (0); }
46 typedef dict_val_t num_dict_val_t;
48 template <typename VAL> struct dict_values_t : parsed_values_t<VAL> {};
50 template <typename OPSTR=op_str_t>
51 struct top_dict_values_t : dict_values_t<OPSTR>
55 dict_values_t<OPSTR>::init ();
56 charStringsOffset = 0;
59 void fini () { dict_values_t<OPSTR>::fini (); }
61 unsigned int calculate_serialized_op_size (const OPSTR& opstr) const
65 case OpCode_CharStrings:
67 return OpCode_Size (OpCode_longintdict) + 4 + OpCode_Size (opstr.op);
70 return opstr.str.length;
74 unsigned int charStringsOffset;
75 unsigned int FDArrayOffset;
78 struct dict_opset_t : opset_t<number_t>
80 static void process_op (op_code_t op, interp_env_t<number_t>& env)
83 case OpCode_longintdict: /* 5-byte integer */
84 env.argStack.push_longint_from_substr (env.str_ref);
87 case OpCode_BCD: /* real number */
88 env.argStack.push_real (parse_bcd (env.str_ref));
92 opset_t<number_t>::process_op (op, env);
97 /* Turns CFF's BCD format into strtod understandable string */
98 static double parse_bcd (byte_str_ref_t& str_ref)
100 if (unlikely (str_ref.in_error ())) return .0;
102 enum Nibble { DECIMAL=10, EXP_POS, EXP_NEG, RESERVED, NEG, END };
105 unsigned char byte = 0;
106 for (unsigned i = 0, count = 0; count < ARRAY_LENGTH (buf); ++i, ++count)
111 if (unlikely (!str_ref.avail ())) break;
118 nibble = byte & 0x0F;
120 if (unlikely (nibble == RESERVED)) break;
121 else if (nibble == END)
125 if (unlikely (!hb_parse_double (&p, p + count, &pv, true/* whole buffer */)))
131 buf[count] = "0123456789.EE?-?"[nibble];
132 if (nibble == EXP_NEG)
135 if (unlikely (count == ARRAY_LENGTH (buf))) break;
141 str_ref.set_error ();
145 static bool is_hint_op (op_code_t op)
149 case OpCode_BlueValues:
150 case OpCode_OtherBlues:
151 case OpCode_FamilyBlues:
152 case OpCode_FamilyOtherBlues:
153 case OpCode_StemSnapH:
154 case OpCode_StemSnapV:
157 case OpCode_BlueScale:
158 case OpCode_BlueShift:
159 case OpCode_BlueFuzz:
160 case OpCode_ForceBold:
161 case OpCode_LanguageGroup:
162 case OpCode_ExpansionFactor:
170 template <typename VAL=op_str_t>
171 struct top_dict_opset_t : dict_opset_t
173 static void process_op (op_code_t op, interp_env_t<number_t>& env, top_dict_values_t<VAL> & dictval)
176 case OpCode_CharStrings:
177 dictval.charStringsOffset = env.argStack.pop_uint ();
181 dictval.FDArrayOffset = env.argStack.pop_uint ();
184 case OpCode_FontMatrix:
188 dict_opset_t::process_op (op, env);
194 template <typename OPSET, typename PARAM, typename ENV=num_interp_env_t>
195 struct dict_interpreter_t : interpreter_t<ENV>
197 bool interpret (PARAM& param)
200 while (SUPER::env.str_ref.avail ())
202 OPSET::process_op (SUPER::env.fetch_op (), SUPER::env, param);
203 if (unlikely (SUPER::env.in_error ()))
211 typedef interpreter_t<ENV> SUPER;
214 } /* namespace CFF */
216 #endif /* HB_CFF_INTERP_DICT_COMMON_HH */