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- /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 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
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
- this.EXPORTED_SYMBOLS = [ "FileUtils" ];
- Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
- const Cc = Components.classes;
- const Ci = Components.interfaces;
- const Cr = Components.results;
- XPCOMUtils.defineLazyServiceGetter(this, "gDirService",
- "@mozilla.org/file/directory_service;1",
- "nsIProperties");
- this.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 file 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|. The last item in this array must be the
- * leaf name of a file.
- * @return nsIFile object for the file specified. The file is NOT created
- * if it does not exist, however all required directories along
- * the way are.
- */
- getFile: function FileUtils_getFile(key, pathArray, followLinks) {
- var file = this.getDir(key, pathArray.slice(0, -1), true, followLinks);
- file.append(pathArray[pathArray.length - 1]);
- return file;
- },
- /**
- * 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|
- * @param shouldCreate
- * true if the directory hierarchy specified in |pathArray|
- * should be created if it does not exist, false otherwise.
- * @param followLinks (optional)
- * true if links should be followed, false otherwise.
- * @return nsIFile object for the location specified.
- */
- getDir: function FileUtils_getDir(key, pathArray, shouldCreate, followLinks) {
- var dir = gDirService.get(key, Ci.nsIFile);
- for (var i = 0; i < pathArray.length; ++i) {
- dir.append(pathArray[i]);
- }
- if (shouldCreate) {
- try {
- dir.create(Ci.nsIFile.DIRECTORY_TYPE, this.PERMS_DIRECTORY);
- } catch (ex if ex.result == Cr.NS_ERROR_FILE_ALREADY_EXISTS) {
- // Ignore the exception due to a directory that already exists.
- }
- }
- if (!followLinks)
- dir.followLinks = false;
- 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 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 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.nsILocalFile, "initWithPath")
- };
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