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