browserfs
Version:
A filesystem in your browser!
143 lines • 5.19 kB
JavaScript
exports.__esModule = true;
/**
* Indicates the type of the given file. Applied to 'mode'.
*/
var FileType;
(function (FileType) {
FileType[FileType["FILE"] = 32768] = "FILE";
FileType[FileType["DIRECTORY"] = 16384] = "DIRECTORY";
FileType[FileType["SYMLINK"] = 40960] = "SYMLINK";
})(FileType = exports.FileType || (exports.FileType = {}));
/**
* Emulation of Node's `fs.Stats` object.
*
* Attribute descriptions are from `man 2 stat'
* @see http://nodejs.org/api/fs.html#fs_class_fs_stats
* @see http://man7.org/linux/man-pages/man2/stat.2.html
*/
var Stats = (function () {
/**
* Provides information about a particular entry in the file system.
* @param [Number] item_type type of the item (FILE, DIRECTORY, SYMLINK, or SOCKET)
* @param [Number] size Size of the item in bytes. For directories/symlinks,
* this is normally the size of the struct that represents the item.
* @param [Number] mode Unix-style file mode (e.g. 0o644)
* @param [Date?] atime time of last access
* @param [Date?] mtime time of last modification
* @param [Date?] ctime time of creation
*/
function Stats(itemType, size, mode, atime, mtime, ctime) {
if (atime === void 0) { atime = new Date(); }
if (mtime === void 0) { mtime = new Date(); }
if (ctime === void 0) { ctime = new Date(); }
this.size = size;
this.atime = atime;
this.mtime = mtime;
this.ctime = ctime;
/**
* UNSUPPORTED ATTRIBUTES
* I assume no one is going to need these details, although we could fake
* appropriate values if need be.
*/
// ID of device containing file
this.dev = 0;
// inode number
this.ino = 0;
// device ID (if special file)
this.rdev = 0;
// number of hard links
this.nlink = 1;
// blocksize for file system I/O
this.blksize = 4096;
// @todo Maybe support these? atm, it's a one-user filesystem.
// user ID of owner
this.uid = 0;
// group ID of owner
this.gid = 0;
// time file was created (currently unsupported)
this.birthtime = new Date(0);
// XXX: Some file systems stash data on stats objects.
this.fileData = null;
if (!mode) {
switch (itemType) {
case FileType.FILE:
this.mode = 0x1a4;
break;
case FileType.DIRECTORY:
default:
this.mode = 0x1ff;
}
}
else {
this.mode = mode;
}
// number of 512B blocks allocated
this.blocks = Math.ceil(size / 512);
// Check if mode also includes top-most bits, which indicate the file's
// type.
if (this.mode < 0x1000) {
this.mode |= itemType;
}
}
Stats.fromBuffer = function (buffer) {
var size = buffer.readUInt32LE(0), mode = buffer.readUInt32LE(4), atime = buffer.readDoubleLE(8), mtime = buffer.readDoubleLE(16), ctime = buffer.readDoubleLE(24);
return new Stats(mode & 0xF000, size, mode & 0xFFF, new Date(atime), new Date(mtime), new Date(ctime));
};
Stats.prototype.toBuffer = function () {
var buffer = Buffer.alloc(32);
buffer.writeUInt32LE(this.size, 0);
buffer.writeUInt32LE(this.mode, 4);
buffer.writeDoubleLE(this.atime.getTime(), 8);
buffer.writeDoubleLE(this.mtime.getTime(), 16);
buffer.writeDoubleLE(this.ctime.getTime(), 24);
return buffer;
};
/**
* **Nonstandard**: Clone the stats object.
* @return [BrowserFS.node.fs.Stats]
*/
Stats.prototype.clone = function () {
return new Stats(this.mode & 0xF000, this.size, this.mode & 0xFFF, this.atime, this.mtime, this.ctime);
};
/**
* @return [Boolean] True if this item is a file.
*/
Stats.prototype.isFile = function () {
return (this.mode & 0xF000) === FileType.FILE;
};
/**
* @return [Boolean] True if this item is a directory.
*/
Stats.prototype.isDirectory = function () {
return (this.mode & 0xF000) === FileType.DIRECTORY;
};
/**
* @return [Boolean] True if this item is a symbolic link (only valid through lstat)
*/
Stats.prototype.isSymbolicLink = function () {
return (this.mode & 0xF000) === FileType.SYMLINK;
};
/**
* Change the mode of the file. We use this helper function to prevent messing
* up the type of the file, which is encoded in mode.
*/
Stats.prototype.chmod = function (mode) {
this.mode = (this.mode & 0xF000) | mode;
};
// We don't support the following types of files.
Stats.prototype.isSocket = function () {
return false;
};
Stats.prototype.isBlockDevice = function () {
return false;
};
Stats.prototype.isCharacterDevice = function () {
return false;
};
Stats.prototype.isFIFO = function () {
return false;
};
return Stats;
}());
exports["default"] = Stats;
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