The Tor Browser: comparison addon-sdk/source/lib/sdk/io/file.js

comparison: addon-sdk/source/lib/sdk/io/file.js

addon-sdk/source/lib/sdk/io/file.js

branch: TOR_BUG_3246
changeset 7: 129ffea94266

equal deleted inserted replaced

--1:000000000000
+:be08f73ad893
+/* 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/. */
+"use strict";
+module.metadata = {
+"stability": "experimental"
+};
+const {Cc,Ci,Cr} = require("chrome");
+const byteStreams = require("./byte-streams");
+const textStreams = require("./text-streams");
+// Flags passed when opening a file.  See nsprpub/pr/include/prio.h.
+const OPEN_FLAGS = {
+RDONLY: parseInt("0x01"),
+WRONLY: parseInt("0x02"),
+CREATE_FILE: parseInt("0x08"),
+APPEND: parseInt("0x10"),
+TRUNCATE: parseInt("0x20"),
+EXCL: parseInt("0x80")
+};
+var dirsvc = Cc["@mozilla.org/file/directory_service;1"]
+.getService(Ci.nsIProperties);
+function MozFile(path) {
+var file = Cc['@mozilla.org/file/local;1']
+.createInstance(Ci.nsILocalFile);
+file.initWithPath(path);
+return file;
+}
+function ensureReadable(file) {
+if (!file.isReadable())
+throw new Error("path is not readable: " + file.path);
+}
+function ensureDir(file) {
+ensureExists(file);
+if (!file.isDirectory())
+throw new Error("path is not a directory: " + file.path);
+}
+function ensureFile(file) {
+ensureExists(file);
+if (!file.isFile())
+throw new Error("path is not a file: " + file.path);
+}
+function ensureExists(file) {
+if (!file.exists())
+throw friendlyError(Cr.NS_ERROR_FILE_NOT_FOUND, file.path);
+}
+function friendlyError(errOrResult, filename) {
+var isResult = typeof(errOrResult) === "number";
+var result = isResult ? errOrResult : errOrResult.result;
+switch (result) {
+case Cr.NS_ERROR_FILE_NOT_FOUND:
+return new Error("path does not exist: " + filename);
+}
+return isResult ? new Error("XPCOM error code: " + errOrResult) : errOrResult;
+}
+exports.exists = function exists(filename) {
+return MozFile(filename).exists();
+};
+exports.isFile = function isFile(filename) {
+return MozFile(filename).isFile();
+};
+exports.read = function read(filename, mode) {
+if (typeof(mode) !== "string")
+mode = "";
+// Ensure mode is read-only.
+mode = /b/.test(mode) ? "b" : "";
+var stream = exports.open(filename, mode);
+try {
+var str = stream.read();
+}
+finally {
+stream.close();
+}
+return str;
+};
+exports.join = function join(base) {
+if (arguments.length < 2)
+throw new Error("need at least 2 args");
+base = MozFile(base);
+for (var i = 1; i < arguments.length; i++)
+base.append(arguments[i]);
+return base.path;
+};
+exports.dirname = function dirname(path) {
+var parent = MozFile(path).parent;
+return parent ? parent.path : "";
+};
+exports.basename = function basename(path) {
+var leafName = MozFile(path).leafName;
+// On Windows, leafName when the path is a volume letter and colon ("c:") is
+// the path itself.  But such a path has no basename, so we want the empty
+// string.
+return leafName == path ? "" : leafName;
+};
+exports.list = function list(path) {
+var file = MozFile(path);
+ensureDir(file);
+ensureReadable(file);
+var entries = file.directoryEntries;
+var entryNames = [];
+while(entries.hasMoreElements()) {
+var entry = entries.getNext();
+entry.QueryInterface(Ci.nsIFile);
+entryNames.push(entry.leafName);
+}
+return entryNames;
+};
+exports.open = function open(filename, mode) {
+var file = MozFile(filename);
+if (typeof(mode) !== "string")
+mode = "";
+// File opened for write only.
+if (/w/.test(mode)) {
+if (file.exists())
+ensureFile(file);
+var stream = Cc['@mozilla.org/network/file-output-stream;1'].
+createInstance(Ci.nsIFileOutputStream);
+var openFlags = OPEN_FLAGS.WRONLY |
+OPEN_FLAGS.CREATE_FILE |
+OPEN_FLAGS.TRUNCATE;
+var permFlags = parseInt("0644", 8); // u+rw go+r
+try {
+stream.init(file, openFlags, permFlags, 0);
+}
+catch (err) {
+throw friendlyError(err, filename);
+}
+return /b/.test(mode) ?
+new byteStreams.ByteWriter(stream) :
+new textStreams.TextWriter(stream);
+}
+// File opened for read only, the default.
+ensureFile(file);
+stream = Cc['@mozilla.org/network/file-input-stream;1'].
+createInstance(Ci.nsIFileInputStream);
+try {
+stream.init(file, OPEN_FLAGS.RDONLY, 0, 0);
+}
+catch (err) {
+throw friendlyError(err, filename);
+}
+return /b/.test(mode) ?
+new byteStreams.ByteReader(stream) :
+new textStreams.TextReader(stream);
+};
+exports.remove = function remove(path) {
+var file = MozFile(path);
+ensureFile(file);
+file.remove(false);
+};
+exports.mkpath = function mkpath(path) {
+var file = MozFile(path);
+if (!file.exists())
+file.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8)); // u+rwx go+rx
+else if (!file.isDirectory())
+throw new Error("The path already exists and is not a directory: " + path);
+};
+exports.rmdir = function rmdir(path) {
+var file = MozFile(path);
+ensureDir(file);
+try {
+file.remove(false);
+}
+catch (err) {
+// Bug 566950 explains why we're not catching a specific exception here.
+throw new Error("The directory is not empty: " + path);
+}
+};