About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
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Allocate a buffer from an ArrayBuffer.
npm install @stdlib/buffer-from-arraybufferAlternatively,
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scripttag without installation and bundlers, use the ES Module available on theesmbranch (see README). - If you are using Deno, visit the
denobranch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umdbranch (see README).
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To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var arraybuffer2buffer = require( '@stdlib/buffer-from-arraybuffer' );Allocates a buffer from an ArrayBuffer.
var ArrayBuffer = require( '@stdlib/array-buffer' );
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab );
// returns <Buffer>By default, the function allocates a buffer starting from the first byte of the provided ArrayBuffer. To specify an alternative starting index, provide a byteOffset.
var ArrayBuffer = require( '@stdlib/array-buffer' );
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab, 2 );
// returns <Buffer>
var len = buf.length;
// returns 8By default, the function allocates a buffer until the end of the provided ArrayBuffer. To allocate a specified number of ArrayBuffer bytes, provide a length.
var ArrayBuffer = require( '@stdlib/array-buffer' );
var ab = new ArrayBuffer( 10 );
var buf = arraybuffer2buffer( ab, 2, 4 );
// returns <Buffer>
var len = buf.length;
// returns 4The behavior of this function varies across Node.js versions due to changes in the underlying Node.js APIs:
<3.0.0: the function copiesArrayBufferbytes to a newBufferinstance.>=3.0.0and<5.10.0: if provided abyteOffset, the function copiesArrayBufferbytes to a newBufferinstance; otherwise, the function returns a view of anArrayBufferwithout copying the underlying memory.<6.0.0: if provided an emptyArrayBuffer, the function returns an emptyBufferwhich is not anArrayBufferview.>=6.0.0: the function returns a view of anArrayBufferwithout copying the underlying memory.
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 );
}@stdlib/buffer-ctor: Buffer.@stdlib/buffer-from-array: allocate a buffer using an octet array.@stdlib/buffer-from-buffer: copy buffer data to a new Buffer instance.@stdlib/buffer-from-string: allocate a buffer containing a provided string.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
