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comparison mupdf-source/thirdparty/harfbuzz/src/hb-cff-interp-dict-common.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright © 2018 Adobe Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
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.
11 *
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
16 * DAMAGE.
17 *
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.
23 *
24 * Adobe Author(s): Michiharu Ariza
25 */
26 #ifndef HB_CFF_INTERP_DICT_COMMON_HH
27 #define HB_CFF_INTERP_DICT_COMMON_HH
28
29 #include "hb-cff-interp-common.hh"
30
31 namespace CFF {
32
33 using namespace OT;
34
35 /* an opstr and the parsed out dict value(s) */
36 struct dict_val_t : op_str_t
37 {
38 void init () { single_val.set_int (0); }
39 void fini () {}
40
41 number_t single_val;
42 };
43
44 typedef dict_val_t num_dict_val_t;
45
46 template <typename VAL> struct dict_values_t : parsed_values_t<VAL> {};
47
48 template <typename OPSTR=op_str_t>
49 struct top_dict_values_t : dict_values_t<OPSTR>
50 {
51 void init ()
52 {
53 dict_values_t<OPSTR>::init ();
54 charStringsOffset = 0;
55 FDArrayOffset = 0;
56 }
57 void fini () { dict_values_t<OPSTR>::fini (); }
58
59 unsigned int charStringsOffset;
60 unsigned int FDArrayOffset;
61 };
62
63 struct dict_opset_t : opset_t<number_t>
64 {
65 static void process_op (op_code_t op, interp_env_t<number_t>& env)
66 {
67 switch (op) {
68 case OpCode_longintdict: /* 5-byte integer */
69 env.argStack.push_longint_from_substr (env.str_ref);
70 break;
71
72 case OpCode_BCD: /* real number */
73 env.argStack.push_real (parse_bcd (env.str_ref));
74 break;
75
76 default:
77 opset_t<number_t>::process_op (op, env);
78 break;
79 }
80 }
81
82 /* Turns CFF's BCD format into strtod understandable string */
83 static double parse_bcd (byte_str_ref_t& str_ref)
84 {
85 if (unlikely (str_ref.in_error ())) return .0;
86
87 enum Nibble { DECIMAL=10, EXP_POS, EXP_NEG, RESERVED, NEG, END };
88
89 char buf[32];
90 unsigned char byte = 0;
91 for (unsigned i = 0, count = 0; count < ARRAY_LENGTH (buf); ++i, ++count)
92 {
93 unsigned nibble;
94 if (!(i & 1))
95 {
96 if (unlikely (!str_ref.avail ())) break;
97
98 byte = str_ref[0];
99 str_ref.inc ();
100 nibble = byte >> 4;
101 }
102 else
103 nibble = byte & 0x0F;
104
105 if (unlikely (nibble == RESERVED)) break;
106 else if (nibble == END)
107 {
108 const char *p = buf;
109 double pv;
110 if (unlikely (!hb_parse_double (&p, p + count, &pv, true/* whole buffer */)))
111 break;
112 return pv;
113 }
114 else
115 {
116 buf[count] = "0123456789.EE?-?"[nibble];
117 if (nibble == EXP_NEG)
118 {
119 ++count;
120 if (unlikely (count == ARRAY_LENGTH (buf))) break;
121 buf[count] = '-';
122 }
123 }
124 }
125
126 str_ref.set_error ();
127 return .0;
128 }
129
130 static bool is_hint_op (op_code_t op)
131 {
132 switch (op)
133 {
134 case OpCode_BlueValues:
135 case OpCode_OtherBlues:
136 case OpCode_FamilyBlues:
137 case OpCode_FamilyOtherBlues:
138 case OpCode_StemSnapH:
139 case OpCode_StemSnapV:
140 case OpCode_StdHW:
141 case OpCode_StdVW:
142 case OpCode_BlueScale:
143 case OpCode_BlueShift:
144 case OpCode_BlueFuzz:
145 case OpCode_ForceBold:
146 case OpCode_LanguageGroup:
147 case OpCode_ExpansionFactor:
148 return true;
149 default:
150 return false;
151 }
152 }
153 };
154
155 template <typename VAL=op_str_t>
156 struct top_dict_opset_t : dict_opset_t
157 {
158 static void process_op (op_code_t op, interp_env_t<number_t>& env, top_dict_values_t<VAL> & dictval)
159 {
160 switch (op) {
161 case OpCode_CharStrings:
162 dictval.charStringsOffset = env.argStack.pop_uint ();
163 env.clear_args ();
164 break;
165 case OpCode_FDArray:
166 dictval.FDArrayOffset = env.argStack.pop_uint ();
167 env.clear_args ();
168 break;
169 case OpCode_FontMatrix:
170 env.clear_args ();
171 break;
172 default:
173 dict_opset_t::process_op (op, env);
174 break;
175 }
176 }
177 };
178
179 template <typename OPSET, typename PARAM, typename ENV=num_interp_env_t>
180 struct dict_interpreter_t : interpreter_t<ENV>
181 {
182 dict_interpreter_t (ENV& env_) : interpreter_t<ENV> (env_) {}
183
184 bool interpret (PARAM& param)
185 {
186 param.init ();
187 while (SUPER::env.str_ref.avail ())
188 {
189 OPSET::process_op (SUPER::env.fetch_op (), SUPER::env, param);
190 if (unlikely (SUPER::env.in_error ()))
191 return false;
192 }
193
194 return true;
195 }
196
197 private:
198 typedef interpreter_t<ENV> SUPER;
199 };
200
201 } /* namespace CFF */
202
203 #endif /* HB_CFF_INTERP_DICT_COMMON_HH */