You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.9 KiB
70 lines
1.9 KiB
2 weeks ago
|
# Buffer From
|
||
|
|
|
||
|
|
A [ponyfill](https://ponyfill.com) for `Buffer.from`, uses native implementation if available.
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
```sh
|
||
|
|
npm install --save buffer-from
|
||
|
|
```
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
```js
|
||
|
|
const bufferFrom = require('buffer-from')
|
||
|
|
|
||
|
|
console.log(bufferFrom([1, 2, 3, 4]))
|
||
|
|
//=> <Buffer 01 02 03 04>
|
||
|
|
|
||
|
|
const arr = new Uint8Array([1, 2, 3, 4])
|
||
|
|
console.log(bufferFrom(arr.buffer, 1, 2))
|
||
|
|
//=> <Buffer 02 03>
|
||
|
|
|
||
|
|
console.log(bufferFrom('test', 'utf8'))
|
||
|
|
//=> <Buffer 74 65 73 74>
|
||
|
|
|
||
|
|
const buf = bufferFrom('test')
|
||
|
|
console.log(bufferFrom(buf))
|
||
|
|
//=> <Buffer 74 65 73 74>
|
||
|
|
```
|
||
|
|
|
||
|
|
## API
|
||
|
|
|
||
|
|
### bufferFrom(array)
|
||
|
|
|
||
|
|
- `array` <Array>
|
||
|
|
|
||
|
|
Allocates a new `Buffer` using an `array` of octets.
|
||
|
|
|
||
|
|
### bufferFrom(arrayBuffer[, byteOffset[, length]])
|
||
|
|
|
||
|
|
- `arrayBuffer` <ArrayBuffer> The `.buffer` property of a TypedArray or ArrayBuffer
|
||
|
|
- `byteOffset` <Integer> Where to start copying from `arrayBuffer`. **Default:** `0`
|
||
|
|
- `length` <Integer> How many bytes to copy from `arrayBuffer`. **Default:** `arrayBuffer.length - byteOffset`
|
||
|
|
|
||
|
|
When passed a reference to the `.buffer` property of a TypedArray instance, the
|
||
|
|
newly created `Buffer` will share the same allocated memory as the TypedArray.
|
||
|
|
|
||
|
|
The optional `byteOffset` and `length` arguments specify a memory range within
|
||
|
|
the `arrayBuffer` that will be shared by the `Buffer`.
|
||
|
|
|
||
|
|
### bufferFrom(buffer)
|
||
|
|
|
||
|
|
- `buffer` <Buffer> An existing `Buffer` to copy data from
|
||
|
|
|
||
|
|
Copies the passed `buffer` data onto a new `Buffer` instance.
|
||
|
|
|
||
|
|
### bufferFrom(string[, encoding])
|
||
|
|
|
||
|
|
- `string` <String> A string to encode.
|
||
|
|
- `encoding` <String> The encoding of `string`. **Default:** `'utf8'`
|
||
|
|
|
||
|
|
Creates a new `Buffer` containing the given JavaScript string `string`. If
|
||
|
|
provided, the `encoding` parameter identifies the character encoding of
|
||
|
|
`string`.
|
||
|
|
|
||
|
|
## See also
|
||
|
|
|
||
|
|
- [buffer-alloc](https://github.com/LinusU/buffer-alloc) A ponyfill for `Buffer.alloc`
|
||
|
|
- [buffer-alloc-unsafe](https://github.com/LinusU/buffer-alloc-unsafe) A ponyfill for `Buffer.allocUnsafe`
|