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
|
#
# Copyright (C) 2008-2010 Wayne Meissner
# All rights reserved.
#
# This file is part of ruby-ffi.
#
# This code is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License version 3 only, as
# published by the Free Software Foundation.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# version 3 for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# version 3 along with this work. If not, see <http://www.gnu.org/licenses/>.
#
# see {file:README}
module FFI
# @param [Type, DataConverter, Symbol] old type definition used by {FFI.find_type}
# @param [Symbol] add new type definition's name to add
# @return [Type]
# Add a definition type to type definitions.
def self.typedef(old, add)
TypeDefs[add] = self.find_type(old)
end
# (see FFI.typedef)
def self.add_typedef(old, add)
typedef old, add
end
# @param [Type, DataConverter, Symbol] name
# @param [Hash] type_map if nil, {FFI::TypeDefs} is used
# @return [Type]
# Find a type in +type_map+ ({FFI::TypeDefs}, by default) from
# a type objet, a type name (symbol). If +name+ is a {DataConverter},
# a new {Type::Mapped} is created.
def self.find_type(name, type_map = nil)
if name.is_a?(Type)
name
elsif type_map && type_map.has_key?(name)
type_map[name]
elsif TypeDefs.has_key?(name)
TypeDefs[name]
elsif name.is_a?(DataConverter)
(type_map || TypeDefs)[name] = Type::Mapped.new(name)
else
raise TypeError, "unable to resolve type '#{name}'"
end
end
# List of type definitions
TypeDefs.merge!({
# The C void type; only useful for function return types
:void => Type::VOID,
# C boolean type
:bool => Type::BOOL,
# C nul-terminated string
:string => Type::STRING,
# C signed char
:char => Type::CHAR,
# C unsigned char
:uchar => Type::UCHAR,
# C signed short
:short => Type::SHORT,
# C unsigned short
:ushort => Type::USHORT,
# C signed int
:int => Type::INT,
# C unsigned int
:uint => Type::UINT,
# C signed long
:long => Type::LONG,
# C unsigned long
:ulong => Type::ULONG,
# C signed long long integer
:long_long => Type::LONG_LONG,
# C unsigned long long integer
:ulong_long => Type::ULONG_LONG,
# C single precision float
:float => Type::FLOAT,
# C double precision float
:double => Type::DOUBLE,
# Native memory address
:pointer => Type::POINTER,
# 8 bit signed integer
:int8 => Type::INT8,
# 8 bit unsigned integer
:uint8 => Type::UINT8,
# 16 bit signed integer
:int16 => Type::INT16,
# 16 bit unsigned integer
:uint16 => Type::UINT16,
# 32 bit signed integer
:int32 => Type::INT32,
# 32 bit unsigned integer
:uint32 => Type::UINT32,
# 64 bit signed integer
:int64 => Type::INT64,
# 64 bit unsigned integer
:uint64 => Type::UINT64,
:buffer_in => Type::BUFFER_IN,
:buffer_out => Type::BUFFER_OUT,
:buffer_inout => Type::BUFFER_INOUT,
# Used in function prototypes to indicate the arguments are variadic
:varargs => Type::VARARGS,
})
class StrPtrConverter
extend DataConverter
native_type Type::POINTER
# @param [Pointer] val
# @param [] ctx
# @return [Array(String, Pointer)]
# Returns a [ String, Pointer ] tuple so the C memory for the string can be freed
def self.from_native(val, ctx)
[ val.null? ? nil : val.get_string(0), val ]
end
end
typedef(StrPtrConverter, :strptr)
# @param type +type+ is an instance of class accepted by {FFI.find_type}
# @return [Numeric]
# Get +type+ size, in bytes.
def self.type_size(type)
find_type(type).size
end
# Load all the platform dependent types
begin
File.open(File.join(Platform::CONF_DIR, 'types.conf'), "r") do |f|
prefix = "rbx.platform.typedef."
f.each_line { |line|
if line.index(prefix) == 0
new_type, orig_type = line.chomp.slice(prefix.length..-1).split(/\s*=\s*/)
typedef(orig_type.to_sym, new_type.to_sym)
end
}
end
typedef :pointer, :caddr_t
rescue Errno::ENOENT
end
end
|
