1 /****************************************************************************
2 *
3 * cffparse.h
4 *
5 * CFF token stream parser (specification)
6 *
7 * Copyright (C) 1996-2019 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18
19 #ifndef CFFPARSE_H_
20 #define CFFPARSE_H_
21
22
23 #include <ft2build.h>
24 #include FT_INTERNAL_CFF_TYPES_H
25 #include FT_INTERNAL_OBJECTS_H
26
27
28 FT_BEGIN_HEADER
29
30
31 /* CFF uses constant parser stack size; */
32 /* CFF2 can increase from default 193 */
33 #define CFF_MAX_STACK_DEPTH 96
34
35 /*
36 * There are plans to remove the `maxstack' operator in a forthcoming
37 * revision of the CFF2 specification, increasing the (then static) stack
38 * size to 513. By making the default stack size equal to the maximum
39 * stack size, the operator is essentially disabled, which has the
40 * desired effect in FreeType.
41 */
42 #define CFF2_MAX_STACK 513
43 #define CFF2_DEFAULT_STACK 513
44
45 #define CFF_CODE_TOPDICT 0x1000
46 #define CFF_CODE_PRIVATE 0x2000
47 #define CFF2_CODE_TOPDICT 0x3000
48 #define CFF2_CODE_FONTDICT 0x4000
49 #define CFF2_CODE_PRIVATE 0x5000
50
51
52 typedef struct CFF_ParserRec_
53 {
54 FT_Library library;
55 FT_Byte* start;
56 FT_Byte* limit;
57 FT_Byte* cursor;
58
59 FT_Byte** stack;
60 FT_Byte** top;
61 FT_UInt stackSize; /* allocated size */
62
63 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE
64 FT_ListRec t2_strings;
65 #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */
66
67 FT_UInt object_code;
68 void* object;
69
70 FT_UShort num_designs; /* a copy of `CFF_FontRecDict->num_designs' */
71 FT_UShort num_axes; /* a copy of `CFF_FontRecDict->num_axes' */
72
73 } CFF_ParserRec, *CFF_Parser;
74
75
76 FT_LOCAL( FT_Long )
77 cff_parse_num( CFF_Parser parser,
78 FT_Byte** d );
79
80 FT_LOCAL( FT_Error )
81 cff_parser_init( CFF_Parser parser,
82 FT_UInt code,
83 void* object,
84 FT_Library library,
85 FT_UInt stackSize,
86 FT_UShort num_designs,
87 FT_UShort num_axes );
88
89 FT_LOCAL( void )
90 cff_parser_done( CFF_Parser parser );
91
92 FT_LOCAL( FT_Error )
93 cff_parser_run( CFF_Parser parser,
94 FT_Byte* start,
95 FT_Byte* limit );
96
97
98 enum
99 {
100 cff_kind_none = 0,
101 cff_kind_num,
102 cff_kind_fixed,
103 cff_kind_fixed_thousand,
104 cff_kind_string,
105 cff_kind_bool,
106 cff_kind_delta,
107 cff_kind_callback,
108 cff_kind_blend,
109
110 cff_kind_max /* do not remove */
111 };
112
113
114 /* now generate handlers for the most simple fields */
115 typedef FT_Error (*CFF_Field_Reader)( CFF_Parser parser );
116
117 typedef struct CFF_Field_Handler_
118 {
119 int kind;
120 int code;
121 FT_UInt offset;
122 FT_Byte size;
123 CFF_Field_Reader reader;
124 FT_UInt array_max;
125 FT_UInt count_offset;
126
127 #ifdef FT_DEBUG_LEVEL_TRACE
128 const char* id;
129 #endif
130
131 } CFF_Field_Handler;
132
133
134 FT_END_HEADER
135
136
137 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE
138 typedef struct CFF_T2_String_
139 {
140 FT_Byte* start;
141 FT_Byte* limit;
142
143 } CFF_T2_StringRec, *CFF_T2_String;
144 #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */
145
146 #endif /* CFFPARSE_H_ */
147
148
149 /* END */