sync.js (2338B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isObject = require( '@stdlib/assert/is-plain-object' ); 24 var isUint8Array = require( '@stdlib/assert/is-uint8array' ); 25 var instanceOf = require( '@stdlib/assert/instance-of' ); 26 var readFileSync = require( './../../read-file' ).sync; 27 var Uint8Array = require( '@stdlib/array/uint8' ); 28 29 30 // MAIN // 31 32 /** 33 * Synchronously reads the entire contents of a WebAssembly file. 34 * 35 * @param {(string|Buffer|integer)} file - file path or file descriptor 36 * @param {Options} [options] - options 37 * @param {string} [options.flag] - file status flag 38 * @throws {TypeError} options argument must be an object 39 * @returns {(Uint8Array|Error)} file contents or an error 40 * 41 * @example 42 * var join = require( 'path' ).join; 43 * var instanceOf = require( '@stdlib/assert/instance-of' ); 44 * 45 * var fpath = join( __dirname, 'foo.wasm' ); 46 * var out = readWASMSync( fpath ); 47 * if ( instanceOf( out, Error ) ) { 48 * throw out; 49 * } 50 * console.log( out ); 51 */ 52 function readWASMSync( file, options ) { 53 var opts; 54 var out; 55 var f; 56 var i; 57 if ( arguments.length > 1 ) { 58 if ( !isObject( options ) ) { 59 throw new TypeError( 'invalid argument. Options argument must be an object. Value: `' + options + '`.' ); 60 } 61 opts = options; 62 } else { 63 opts = {}; 64 } 65 // Always override setting the encoding option, as wasm is a binary file format: 66 opts.encoding = null; 67 f = readFileSync( file, opts ); 68 if ( instanceOf( f, Error ) ) { 69 return f; 70 } 71 if ( isUint8Array( f ) ) { 72 return f; 73 } 74 // Handle older Node.js environments where Buffer objects are not Uint8Arrays... 75 out = new Uint8Array( f.length ); 76 for ( i = 0; i < f.length; i++ ) { 77 out[ i ] = f[ i ]; 78 } 79 return out; 80 } 81 82 83 // EXPORTS // 84 85 module.exports = readWASMSync;