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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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
export var FileUtils = {
MODE_RDONLY: 0x01,
MODE_WRONLY: 0x02,
MODE_RDWR: 0x04,
MODE_CREATE: 0x08,
MODE_APPEND: 0x10,
MODE_TRUNCATE: 0x20,
PERMS_FILE: 0o644,
PERMS_DIRECTORY: 0o755,
/**
* Gets a directory at the specified hierarchy under a nsIDirectoryService
* key.
* @param key
* The Directory Service Key to start from
* @param pathArray
* An array of path components to locate beneath the directory
* specified by |key|
* @return nsIFile object for the location specified.
*/
getDir: function FileUtils_getDir(key, pathArray) {
var dir = Services.dirsvc.get(key, Ci.nsIFile);
for (var i = 0; i < pathArray.length; ++i) {
dir.append(pathArray[i]);
}
return dir;
},
/**
* Opens a file output stream for writing.
* @param file
* The file to write to.
* @param modeFlags
* (optional) File open flags. Can be undefined.
* @returns nsIFileOutputStream to write to.
* @note The stream is initialized with the DEFER_OPEN behavior flag.
* See nsIFileOutputStream.
*/
openFileOutputStream: function FileUtils_openFileOutputStream(
file,
modeFlags
) {
var fos = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(
Ci.nsIFileOutputStream
);
return this._initFileOutputStream(fos, file, modeFlags);
},
/**
* Opens an atomic file output stream for writing.
* @param file
* The file to write to.
* @param modeFlags
* (optional) File open flags. Can be undefined.
* @returns nsIFileOutputStream to write to.
* @note The stream is initialized with the DEFER_OPEN behavior flag.
* See nsIFileOutputStream.
* OpeanAtomicFileOutputStream is generally better than openSafeFileOutputStream
* baecause flushing is not needed in most of the issues.
*/
openAtomicFileOutputStream: function FileUtils_openAtomicFileOutputStream(
file,
modeFlags
) {
var fos = Cc[
"@mozilla.org/network/atomic-file-output-stream;1"
].createInstance(Ci.nsIFileOutputStream);
return this._initFileOutputStream(fos, file, modeFlags);
},
/**
* Opens a safe file output stream for writing.
* @param file
* The file to write to.
* @param modeFlags
* (optional) File open flags. Can be undefined.
* @returns nsIFileOutputStream to write to.
* @note The stream is initialized with the DEFER_OPEN behavior flag.
* See nsIFileOutputStream.
*/
openSafeFileOutputStream: function FileUtils_openSafeFileOutputStream(
file,
modeFlags
) {
var fos = Cc[
"@mozilla.org/network/safe-file-output-stream;1"
].createInstance(Ci.nsIFileOutputStream);
return this._initFileOutputStream(fos, file, modeFlags);
},
_initFileOutputStream: function FileUtils__initFileOutputStream(
fos,
file,
modeFlags
) {
if (modeFlags === undefined) {
modeFlags = this.MODE_WRONLY | this.MODE_CREATE | this.MODE_TRUNCATE;
}
fos.init(file, modeFlags, this.PERMS_FILE, fos.DEFER_OPEN);
return fos;
},
/**
* Closes an atomic file output stream.
* @param stream
* The stream to close.
*/
closeAtomicFileOutputStream: function FileUtils_closeAtomicFileOutputStream(
stream
) {
if (stream instanceof Ci.nsISafeOutputStream) {
try {
stream.finish();
return;
} catch (e) {}
}
stream.close();
},
/**
* Closes a safe file output stream.
* @param stream
* The stream to close.
*/
closeSafeFileOutputStream: function FileUtils_closeSafeFileOutputStream(
stream
) {
if (stream instanceof Ci.nsISafeOutputStream) {
try {
stream.finish();
return;
} catch (e) {}
}
stream.close();
},
File: Components.Constructor(
"@mozilla.org/file/local;1",
Ci.nsIFile,
"initWithPath"
),
};