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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* This file defines the API for handling the passing of data types between
* your module and the page.
*/
/**
* The <code>PP_VarType</code> is an enumeration of the different types that
* can be contained within a <code>PP_Var</code> structure.
*/
[assert_size(4)]
enum PP_VarType {
/**
* An undefined value.
*/
PP_VARTYPE_UNDEFINED = 0,
/**
* A NULL value. This is similar to undefined, but JavaScript differentiates
* the two so it is exposed here as well.
*/
PP_VARTYPE_NULL = 1,
/**
* A boolean value, use the <code>as_bool</code> member of the var.
*/
PP_VARTYPE_BOOL = 2,
/**
* A 32-bit integer value. Use the <code>as_int</code> member of the var.
*/
PP_VARTYPE_INT32 = 3,
/**
* A double-precision floating point value. Use the <code>as_double</code>
* member of the var.
*/
PP_VARTYPE_DOUBLE = 4,
/**
* The Var represents a string. The <code>as_id</code> field is used to
* identify the string, which may be created and retrieved from the
* <code>PPB_Var</code> interface.
*/
PP_VARTYPE_STRING = 5,
/**
* Represents a JavaScript object. This vartype is not currently usable
* from modules, although it is used internally for some tasks.
*/
PP_VARTYPE_OBJECT = 6,
/**
* Arrays and dictionaries are not currently supported but will be added
* in future revisions. These objects are reference counted so be sure
* to properly AddRef/Release them as you would with strings to ensure your
* module will continue to work with future versions of the API.
*/
PP_VARTYPE_ARRAY = 7,
PP_VARTYPE_DICTIONARY = 8,
/**
* ArrayBuffer represents a JavaScript ArrayBuffer. This is the type which
* represents Typed Arrays in JavaScript. Unlike JavaScript 'Array', it is
* only meant to contain basic numeric types, and is always stored
* contiguously. See PPB_VarArrayBuffer_Dev for functions special to
* ArrayBuffer vars.
*/
PP_VARTYPE_ARRAY_BUFFER = 9
};
/**
* The PP_VarValue union stores the data for any one of the types listed
* in the PP_VarType enum.
*/
[union] struct PP_VarValue {
/**
* If <code>type</code> is <code>PP_VARTYPE_BOOL</code>,
* <code>as_bool</code> represents the value of this <code>PP_Var</code> as
* <code>PP_Bool</code>.
*/
PP_Bool as_bool;
/**
* If <code>type</code> is <code>PP_VARTYPE_INT32</code>,
* <code>as_int</code> represents the value of this <code>PP_Var</code> as
* <code>int32_t</code>.
*/
int32_t as_int;
/**
* If <code>type</code> is <code>PP_VARTYPE_DOUBLE</code>,
* <code>as_double</code> represents the value of this <code>PP_Var</code>
* as <code>double</code>.
*/
double_t as_double;
/**
* If <code>type</code> is <code>PP_VARTYPE_STRING</code>,
* <code>PP_VARTYPE_OBJECT</code>, <code>PP_VARTYPE_ARRAY</code>, or
* <code>PP_VARTYPE_DICTIONARY</code>,
* <code>as_id</code> represents the value of this <code>PP_Var</code> as
* an opaque handle assigned by the browser. This handle is guaranteed
* never to be 0, so a module can initialize this ID to 0 to indicate a
* "NULL handle."
*/
int64_t as_id;
};
/**
* The <code>PP_VAR</code> struct is a variant data type and can contain any
* value of one of the types named in the <code>PP_VarType</code> enum. This
* structure is for passing data between native code which can be strongly
* typed and the browser (JavaScript) which isn't strongly typed.
*
* JavaScript has a "number" type for holding a number, and does not
* differentiate between floating point and integer numbers. The
* JavaScript operations will try to optimize operations by using
* integers when possible, but could end up with doubles. Therefore,
* you can't assume a numeric <code>PP_Var</code> will be the type you expect.
* Your code should be capable of handling either int32_t or double for numeric
* PP_Vars sent from JavaScript.
*/
[passByValue, returnByValue, assert_size(16)]
struct PP_Var {
PP_VarType type;
/**
* The <code>padding</code> ensures <code>value</code> is aligned on an
* 8-byte boundary relative to the start of the struct. Some compilers
* align doubles on 8-byte boundaries for 32-bit x86, and some align on
* 4-byte boundaries.
*/
int32_t padding;
/**
* This <code>value</code> represents the contents of the PP_Var. Only one of
* the fields of <code>value</code> is valid at a time based upon
* <code>type</code>.
*/
PP_VarValue value;
};
#inline c
/**
* @addtogroup Functions
* @{
*/
/**
* PP_MakeUndefined() is used to wrap an undefined value into a
* <code>PP_Var</code> struct for passing to the browser.
*
* @return A <code>PP_Var</code> structure.
*/
PP_INLINE struct PP_Var PP_MakeUndefined(void) {
struct PP_Var result = { PP_VARTYPE_UNDEFINED, 0, {PP_FALSE} };
return result;
}
/**
* PP_MakeNull() is used to wrap a null value into a
* <code>PP_Var</code> struct for passing to the browser.
*
* @return A <code>PP_Var</code> structure,
*/
PP_INLINE struct PP_Var PP_MakeNull(void) {
struct PP_Var result = { PP_VARTYPE_NULL, 0, {PP_FALSE} };
return result;
}
/**
* PP_MakeBool() is used to wrap a boolean value into a
* <code>PP_Var</code> struct for passing to the browser.
*
* @param[in] value A <code>PP_Bool</code> enumeration to
* wrap.
*
* @return A <code>PP_Var</code> structure.
*/
PP_INLINE struct PP_Var PP_MakeBool(PP_Bool value) {
struct PP_Var result = { PP_VARTYPE_BOOL, 0, {PP_FALSE} };
result.value.as_bool = value;
return result;
}
/**
* PP_MakeInt32() is used to wrap a 32 bit integer value
* into a <code>PP_Var</code> struct for passing to the browser.
*
* @param[in] value An int32 to wrap.
*
* @return A <code>PP_Var</code> structure.
*/
PP_INLINE struct PP_Var PP_MakeInt32(int32_t value) {
struct PP_Var result = { PP_VARTYPE_INT32, 0, {PP_FALSE} };
result.value.as_int = value;
return result;
}
/**
* PP_MakeDouble() is used to wrap a double value into a
* <code>PP_Var</code> struct for passing to the browser.
*
* @param[in] value A double to wrap.
*
* @return A <code>PP_Var</code> structure.
*/
PP_INLINE struct PP_Var PP_MakeDouble(double value) {
struct PP_Var result = { PP_VARTYPE_DOUBLE, 0, {PP_FALSE} };
result.value.as_double = value;
return result;
}
/**
* @}
*/
#endinl
|