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
|
# Buffer
The `Napi::Buffer` class creates a projection of raw data that can be consumed by
script.
## Methods
### New
Allocates a new `Napi::Buffer` object with a given length.
```cpp
static Napi::Buffer<T> Napi::Buffer::New(napi_env env, size_t length);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] length`: The number of `T` elements to allocate.
Returns a new `Napi::Buffer` object.
### New
Wraps the provided external data into a new `Napi::Buffer` object.
The `Napi::Buffer` object does not assume ownership for the data and expects it to be
valid for the lifetime of the object. Since the `Napi::Buffer` is subject to garbage
collection this overload is only suitable for data which is static and never
needs to be freed.
```cpp
static Napi::Buffer<T> Napi::Buffer::New(napi_env env, T* data, size_t length);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] data`: The pointer to the external data to expose.
- `[in] length`: The number of `T` elements in the external data.
Returns a new `Napi::Buffer` object.
### New
Wraps the provided external data into a new `Napi::Buffer` object.
The `Napi::Buffer` object does not assume ownership for the data and expects it
to be valid for the lifetime of the object. The data can only be freed once the
`finalizeCallback` is invoked to indicate that the `Napi::Buffer` has been released.
```cpp
template <typename Finalizer>
static Napi::Buffer<T> Napi::Buffer::New(napi_env env,
T* data,
size_t length,
Finalizer finalizeCallback);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] data`: The pointer to the external data to expose.
- `[in] length`: The number of `T` elements in the external data.
- `[in] finalizeCallback`: The function to be called when the `Napi::Buffer` is
destroyed. It must implement `operator()`, accept a `T*` (which is the
external data pointer), and return `void`.
Returns a new `Napi::Buffer` object.
### New
Wraps the provided external data into a new `Napi::Buffer` object.
The `Napi::Buffer` object does not assume ownership for the data and expects it to be
valid for the lifetime of the object. The data can only be freed once the
`finalizeCallback` is invoked to indicate that the `Napi::Buffer` has been released.
```cpp
template <typename Finalizer, typename Hint>
static Napi::Buffer<T> Napi::Buffer::New(napi_env env,
T* data,
size_t length,
Finalizer finalizeCallback,
Hint* finalizeHint);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] data`: The pointer to the external data to expose.
- `[in] length`: The number of `T` elements in the external data.
- `[in] finalizeCallback`: The function to be called when the `Napi::Buffer` is
destroyed. It must implement `operator()`, accept a `T*` (which is the
external data pointer) and `Hint*`, and return `void`.
- `[in] finalizeHint`: The hint to be passed as the second parameter of the
finalize callback.
Returns a new `Napi::Buffer` object.
### Copy
Allocates a new `Napi::Buffer` object and copies the provided external data into it.
```cpp
static Napi::Buffer<T> Napi::Buffer::Copy(napi_env env, const T* data, size_t length);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] data`: The pointer to the external data to copy.
- `[in] length`: The number of `T` elements in the external data.
Returns a new `Napi::Buffer` object containing a copy of the data.
### Constructor
Initializes an empty instance of the `Napi::Buffer` class.
```cpp
Napi::Buffer::Buffer();
```
### Constructor
Initializes the `Napi::Buffer` object using an existing Uint8Array.
```cpp
Napi::Buffer::Buffer(napi_env env, napi_value value);
```
- `[in] env`: The environment in which to create the `Napi::Buffer` object.
- `[in] value`: The Uint8Array reference to wrap.
### Data
```cpp
T* Napi::Buffer::Data() const;
```
Returns a pointer the external data.
### Length
```cpp
size_t Napi::Buffer::Length() const;
```
Returns the number of `T` elements in the external data.
|