1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* 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 */
|
