forked from mirrors/gecko-dev
108 lines
3 KiB
JavaScript
108 lines
3 KiB
JavaScript
/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set sts=2 sw=2 et tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/* exported ArrayBuffer_transfer, Library, SubprocessConstants */
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// ctypes is either already available in the chrome worker scope, or defined
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// in scope via loadSubScript.
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/* global ctypes */
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/**
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* Returns a new ArrayBuffer whose contents have been taken from the `buffer`'s
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* data and then is either truncated or zero-extended by `size`. If `size` is
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* undefined, the `byteLength` of the `buffer` is used. This operation leaves
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* `buffer` in a detached state.
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*
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* @param {ArrayBuffer} buffer
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* @param {integer} [size = buffer.byteLength]
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* @returns {ArrayBuffer}
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*/
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var ArrayBuffer_transfer = function(buffer, size = buffer.byteLength) {
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let u8out = new Uint8Array(size);
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let u8buffer = new Uint8Array(buffer, 0, Math.min(size, buffer.byteLength));
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u8out.set(u8buffer);
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return u8out.buffer;
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};
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var libraries = {};
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var Library = class Library {
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constructor(name, names, definitions) {
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if (name in libraries) {
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return libraries[name];
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}
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for (let name of names) {
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try {
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if (!this.library) {
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this.library = ctypes.open(name);
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}
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} catch (e) {
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// Ignore errors until we've tried all the options.
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}
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}
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if (!this.library) {
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throw new Error("Could not load libc");
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}
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libraries[name] = this;
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for (let symbol of Object.keys(definitions)) {
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this.declare(symbol, ...definitions[symbol]);
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}
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}
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declare(name, ...args) {
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Object.defineProperty(this, name, {
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configurable: true,
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get() {
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Object.defineProperty(this, name, {
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configurable: true,
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value: this.library.declare(name, ...args),
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});
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return this[name];
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},
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});
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}
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};
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/**
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* Holds constants which apply to various Subprocess operations.
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*
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* @namespace
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* @lends Subprocess
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*/
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var SubprocessConstants = {
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/**
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* @property {integer} ERROR_END_OF_FILE
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* The operation failed because the end of the file was reached.
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* @constant
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*/
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ERROR_END_OF_FILE: 0xff7a0001,
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/**
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* @property {integer} ERROR_INVALID_JSON
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* The operation failed because an invalid JSON was encountered.
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* @constant
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*/
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ERROR_INVALID_JSON: 0xff7a0002,
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/**
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* @property {integer} ERROR_BAD_EXECUTABLE
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* The operation failed because the given file did not exist, or
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* could not be executed.
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* @constant
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*/
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ERROR_BAD_EXECUTABLE: 0xff7a0003,
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/**
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* @property {integer} ERROR_INVALID_OPTION
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* The operation failed because an invalid option was provided.
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* @constant
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*/
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ERROR_INVALID_OPTION: 0xff7a0004,
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};
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Object.freeze(SubprocessConstants);
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