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