106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isObject = require( '@stdlib/assert/is-plain-object' );
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var isFunction = require( '@stdlib/assert/is-function' );
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var isUint8Array = require( '@stdlib/assert/is-uint8array' );
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var readFile = require( './../../read-file' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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// MAIN //
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/**
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* Reads the entire contents of a WebAssembly file.
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*
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* @param {(string|Buffer|integer)} file - file path or file descriptor
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* @param {Options} [options] - options
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* @param {string} [options.flag] - file status flag
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* @param {Callback} clbk - callback to invoke after reading a file
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} callback argument must be a function
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*
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* @example
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* var join = require( 'path' ).join;
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* var instanceOf = require( '@stdlib/assert/instance-of' );
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*
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* var fpath = join( __dirname, 'foo.wasm' );
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* readWASM( fpath, onRead );
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*
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* function onRead( error, buf ) {
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* if ( error ) {
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* throw error;
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* }
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* console.log( buf );
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* }
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*/
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function readWASM( file, options, clbk ) {
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var opts;
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var done;
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if ( arguments.length < 3 ) {
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opts = {};
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done = options;
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} else {
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if ( !isObject( options ) ) {
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throw new TypeError( 'invalid argument. Options argument must be an object. Value: `' + options + '`.' );
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}
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opts = options;
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done = clbk;
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}
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if ( !isFunction( done ) ) {
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throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + done + '`.' );
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}
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// Always override setting the encoding option, as wasm is a binary file format:
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opts.encoding = null;
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readFile( file, opts, onRead );
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/**
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* Callback invoked upon reading a file.
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*
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* @private
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* @param {(Error|null)} error - error object
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* @param {(Buffer|string)} file - file contents
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* @returns {void}
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*/
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function onRead( error, file ) {
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var out;
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var i;
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if ( error ) {
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return done( error );
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}
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if ( isUint8Array( file ) ) {
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return done( null, file );
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}
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// Handle older Node.js environments where Buffer objects are not Uint8Arrays...
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out = new Uint8Array( file.length );
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for ( i = 0; i < file.length; i++ ) {
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out[ i ] = file[ i ];
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}
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done( null, out );
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}
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}
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// EXPORTS //
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module.exports = readWASM;
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