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71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Native (xpcom) implementation of key OS.File functions
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*/
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"use strict";
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this.EXPORTED_SYMBOLS = ["read"];
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let {results: Cr, utils: Cu, interfaces: Ci} = Components;
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let SharedAll = Cu.import("resource://gre/modules/osfile/osfile_shared_allthreads.jsm", {});
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let SysAll = {};
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if (SharedAll.Constants.Win) {
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Cu.import("resource://gre/modules/osfile/osfile_win_allthreads.jsm", SysAll);
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} else if (SharedAll.Constants.libc) {
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Cu.import("resource://gre/modules/osfile/osfile_unix_allthreads.jsm", SysAll);
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} else {
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throw new Error("I am neither under Windows nor under a Posix system");
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}
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let {Promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
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let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
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/**
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* The native service holding the implementation of the functions.
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*/
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XPCOMUtils.defineLazyServiceGetter(this,
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"Internals",
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"@mozilla.org/toolkit/osfile/native-internals;1",
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"nsINativeOSFileInternalsService");
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/**
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* Native implementation of OS.File.read
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*
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* This implementation does not handle option |compression|.
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*/
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this.read = function(path, options = {}) {
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// Sanity check on types of options
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if ("encoding" in options && typeof options.encoding != "string") {
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return Promise.reject(new TypeError("Invalid type for option encoding"));
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}
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if ("compression" in options && typeof options.compression != "string") {
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return Promise.reject(new TypeError("Invalid type for option compression"));
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}
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if ("bytes" in options && typeof options.bytes != "number") {
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return Promise.reject(new TypeError("Invalid type for option bytes"));
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}
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let deferred = Promise.defer();
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Internals.read(path,
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options,
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function onSuccess(success) {
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success.QueryInterface(Ci.nsINativeOSFileResult);
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if ("outExecutionDuration" in options) {
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options.outExecutionDuration =
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success.executionDurationMS +
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(options.outExecutionDuration || 0);
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}
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deferred.resolve(success.result);
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},
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function onError(operation, oserror) {
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deferred.reject(new SysAll.Error(operation, oserror, path));
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}
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);
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return deferred.promise;
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};
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