time-to-botec

README.md (5140B)

---

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 # arraybuffer2buffer
 
 > Allocate a [buffer][@stdlib/buffer/ctor] from an [ArrayBuffer][@stdlib/array/buffer].
 
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 ## Usage
 
 ```javascript
 var arraybuffer2buffer = require( '@stdlib/buffer/from-arraybuffer' );
 ```
 
 #### arraybuffer2buffer( buf\[, byteOffset\[, length]] )
 
 Allocates a [buffer][@stdlib/buffer/ctor] from an [`ArrayBuffer`][@stdlib/array/buffer].
 
 ```javascript
 var ArrayBuffer = require( '@stdlib/array/buffer' );
 var ab = new ArrayBuffer( 10 );
 
 var buf = arraybuffer2buffer( ab );
 // returns <Buffer>
 ```
 
 By default, the function allocates a [buffer][@stdlib/buffer/ctor] starting from the first byte of the provided [`ArrayBuffer`][@stdlib/array/buffer]. To specify an alternative starting index, provide a `byteOffset`.
 
 ```javascript
 var ArrayBuffer = require( '@stdlib/array/buffer' );
 var ab = new ArrayBuffer( 10 );
 
 var buf = arraybuffer2buffer( ab, 2 );
 // returns <Buffer>
 
 var len = buf.length;
 // returns 8
 ```
 
 By default, the function allocates a [buffer][@stdlib/buffer/ctor] until the end of the provided [`ArrayBuffer`][@stdlib/array/buffer]. To allocate a specified number of [`ArrayBuffer`][@stdlib/array/buffer] bytes, provide a `length`.
 
 ```javascript
 var ArrayBuffer = require( '@stdlib/array/buffer' );
 var ab = new ArrayBuffer( 10 );
 
 var buf = arraybuffer2buffer( ab, 2, 4 );
 // returns <Buffer>
 
 var len = buf.length;
 // returns 4
 ```
 
 </section>
 
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 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="notes">
 
 ## Notes
 
 The behavior of this function varies across Node.js versions due to changes in the underlying Node.js APIs:
 
 -   `<3.0.0`: the function copies [`ArrayBuffer`][@stdlib/array/buffer] bytes to a new [`Buffer`][@stdlib/buffer/ctor] instance.
 -   `>=3.0.0` and `<5.10.0`: if provided a `byteOffset`, the function copies [`ArrayBuffer`][@stdlib/array/buffer] bytes to a new [`Buffer`][@stdlib/buffer/ctor] instance; otherwise, the function returns a view of an [`ArrayBuffer`][@stdlib/array/buffer] without copying the underlying memory.
 -   `<6.0.0`: if provided an empty [`ArrayBuffer`][@stdlib/array/buffer], the function returns an empty [`Buffer`][@stdlib/buffer/ctor] which is **not** an [`ArrayBuffer`][@stdlib/array/buffer] view.
 -   `>=6.0.0`: the function returns a view of an [`ArrayBuffer`][@stdlib/array/buffer] without copying the underlying memory.
 
 </section>
 
 <!-- /.notes -->
 
 <!-- Package usage examples. -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var ArrayBuffer = require( '@stdlib/array/buffer' );
 var Float64Array = require( '@stdlib/array/float64' );
 var randu = require( '@stdlib/random/base/randu' );
 var IS_LITTLE_ENDIAN = require( '@stdlib/assert/is-little-endian' );
 var arraybuffer2buffer = require( '@stdlib/buffer/from-arraybuffer' );
 
 var high;
 var view;
 var low;
 var buf;
 var ab;
 var i;
 
 // Allocate an ArrayBuffer:
 ab = new ArrayBuffer( 64 );
 
 // Create a Float64 view and set random values:
 view = new Float64Array( ab );
 for ( i = 0; i < view.length; i++ ) {
     view[ i ] = randu();
 }
 
 // Create a new buffer from the ArrayBuffer:
 buf = arraybuffer2buffer( ab );
 
 // Read the high and low words for each double:
 for ( i = 0; i < view.length; i++ ) {
     if ( IS_LITTLE_ENDIAN ) {
         high = buf.readUInt32LE( (8*i)+4 );
         low = buf.readUInt32LE( 8*i );
     } else {
         high = buf.readUInt32BE( 8*i );
         low = buf.readUInt32BE( (8*i)+4 );
     }
     console.log( 'Value: %d. High: %d. Low: %d.', view[ i ], high, low );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 [@stdlib/buffer/ctor]: https://www.npmjs.com/package/@stdlib/buffer/tree/main/ctor
 
 [@stdlib/array/buffer]: https://www.npmjs.com/package/@stdlib/array-buffer
 
 </section>
 
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