forked from mirrors/gecko-dev
127 lines
3.8 KiB
JavaScript
127 lines
3.8 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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var EXPORTED_SYMBOLS = ["read", "writeAtomic"];
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var { Constants } = ChromeUtils.import(
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"resource://gre/modules/osfile/osfile_shared_allthreads.jsm"
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);
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var SysAll;
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if (Constants.Win) {
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SysAll = ChromeUtils.import(
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"resource://gre/modules/osfile/osfile_win_allthreads.jsm"
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);
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} else if (Constants.libc) {
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SysAll = ChromeUtils.import(
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"resource://gre/modules/osfile/osfile_unix_allthreads.jsm"
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);
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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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var { XPCOMUtils } = ChromeUtils.importESModule(
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"resource://gre/modules/XPCOMUtils.sys.mjs"
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);
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const lazy = {};
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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(
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lazy,
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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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/**
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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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var 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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return new Promise((resolve, reject) => {
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lazy.Internals.read(
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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 + (options.outExecutionDuration || 0);
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}
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resolve(success.result);
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},
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function onError(operation, oserror) {
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reject(new SysAll.Error(operation, oserror, path));
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}
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);
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});
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};
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/**
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* Native implementation of OS.File.writeAtomic.
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* This should not be called when |buffer| is a view with some non-zero byte offset.
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* Does not handle option |compression|.
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*/
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var writeAtomic = function(path, buffer, options = {}) {
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// Sanity check on types of options - we check only the encoding, since
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// the others are checked inside Internals.writeAtomic.
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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 (typeof buffer == "string") {
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// Normalize buffer to a C buffer by encoding it
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let encoding = options.encoding || "utf-8";
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buffer = new TextEncoder(encoding).encode(buffer);
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}
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if (ArrayBuffer.isView(buffer)) {
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// We need to throw an error if it's a buffer with some byte offset.
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if ("byteOffset" in buffer && buffer.byteOffset > 0) {
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return Promise.reject(
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new Error("Invalid non-zero value of Typed Array byte offset")
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);
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}
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buffer = buffer.buffer;
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}
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return new Promise((resolve, reject) => {
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lazy.Internals.writeAtomic(
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path,
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buffer,
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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 + (options.outExecutionDuration || 0);
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}
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resolve(success.result);
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},
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function onError(operation, oserror) {
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reject(new SysAll.Error(operation, oserror, path));
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}
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);
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});
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};
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