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import { Buffer, bufferAllocUnsafe, bufferFrom } from './internal/buffer';
import { constants, S } from './constants';
import { Volume } from './volume';
import { EventEmitter } from 'events';
import Stats from './Stats';
const { S_IFMT, S_IFDIR, S_IFREG, S_IFLNK, O_APPEND } = constants;
const getuid = (): number => process.getuid?.() ?? 0;
const getgid = (): number => process.getgid?.() ?? 0;
export const SEP = '/';
/**
* Node in a file system (like i-node, v-node).
*/
export class Node extends EventEmitter {
// i-node number.
ino: number;
// User ID and group ID.
private _uid: number = getuid();
private _gid: number = getgid();
private _atime = new Date();
private _mtime = new Date();
private _ctime = new Date();
// data: string = '';
buf: Buffer;
private _perm = 0o666; // Permissions `chmod`, `fchmod`
mode = S_IFREG; // S_IFDIR, S_IFREG, etc.. (file by default?)
// Number of hard links pointing at this Node.
private _nlink = 1;
// Steps to another node, if this node is a symlink.
symlink: string[];
constructor(ino: number, perm: number = 0o666) {
super();
this._perm = perm;
this.mode |= perm;
this.ino = ino;
}
public set ctime(ctime: Date) {
this._ctime = ctime;
}
public get ctime(): Date {
return this._ctime;
}
public set uid(uid: number) {
this._uid = uid;
this.ctime = new Date();
}
public get uid(): number {
return this._uid;
}
public set gid(gid: number) {
this._gid = gid;
this.ctime = new Date();
}
public get gid(): number {
return this._gid;
}
public set atime(atime: Date) {
this._atime = atime;
this.ctime = new Date();
}
public get atime(): Date {
return this._atime;
}
public set mtime(mtime: Date) {
this._mtime = mtime;
this.ctime = new Date();
}
public get mtime(): Date {
return this._mtime;
}
public set perm(perm: number) {
this._perm = perm;
this.ctime = new Date();
}
public get perm(): number {
return this._perm;
}
public set nlink(nlink: number) {
this._nlink = nlink;
this.ctime = new Date();
}
public get nlink(): number {
return this._nlink;
}
getString(encoding = 'utf8'): string {
this.atime = new Date();
return this.getBuffer().toString(encoding);
}
setString(str: string) {
// this.setBuffer(bufferFrom(str, 'utf8'));
this.buf = bufferFrom(str, 'utf8');
this.touch();
}
getBuffer(): Buffer {
this.atime = new Date();
if (!this.buf) this.setBuffer(bufferAllocUnsafe(0));
return bufferFrom(this.buf); // Return a copy.
}
setBuffer(buf: Buffer) {
this.buf = bufferFrom(buf); // Creates a copy of data.
this.touch();
}
getSize(): number {
return this.buf ? this.buf.length : 0;
}
setModeProperty(property: number) {
this.mode = (this.mode & ~S_IFMT) | property;
}
setIsFile() {
this.setModeProperty(S_IFREG);
}
setIsDirectory() {
this.setModeProperty(S_IFDIR);
}
setIsSymlink() {
this.setModeProperty(S_IFLNK);
}
isFile() {
return (this.mode & S_IFMT) === S_IFREG;
}
isDirectory() {
return (this.mode & S_IFMT) === S_IFDIR;
}
isSymlink() {
// return !!this.symlink;
return (this.mode & S_IFMT) === S_IFLNK;
}
makeSymlink(steps: string[]) {
this.symlink = steps;
this.setIsSymlink();
}
write(buf: Buffer, off: number = 0, len: number = buf.length, pos: number = 0): number {
if (!this.buf) this.buf = bufferAllocUnsafe(0);
if (pos + len > this.buf.length) {
const newBuf = bufferAllocUnsafe(pos + len);
this.buf.copy(newBuf, 0, 0, this.buf.length);
this.buf = newBuf;
}
buf.copy(this.buf, pos, off, off + len);
this.touch();
return len;
}
// Returns the number of bytes read.
read(
buf: Buffer | ArrayBufferView | DataView,
off: number = 0,
len: number = buf.byteLength,
pos: number = 0,
): number {
this.atime = new Date();
if (!this.buf) this.buf = bufferAllocUnsafe(0);
let actualLen = len;
Iif (actualLen > buf.byteLength) {
actualLen = buf.byteLength;
}
if (actualLen + pos > this.buf.length) {
actualLen = this.buf.length - pos;
}
const buf2 = buf instanceof Buffer ? buf : Buffer.from(buf.buffer);
this.buf.copy(buf2, off, pos, pos + actualLen);
return actualLen;
}
truncate(len: number = 0) {
if (!len) this.buf = bufferAllocUnsafe(0);
else {
Iif (!this.buf) this.buf = bufferAllocUnsafe(0);
if (len <= this.buf.length) {
this.buf = this.buf.slice(0, len);
} else {
const buf = bufferAllocUnsafe(len);
this.buf.copy(buf);
buf.fill(0, this.buf.length);
this.buf = buf;
}
}
this.touch();
}
chmod(perm: number) {
this.perm = perm;
this.mode = (this.mode & ~0o777) | perm;
this.touch();
}
chown(uid: number, gid: number) {
this.uid = uid;
this.gid = gid;
this.touch();
}
touch() {
this.mtime = new Date();
this.emit('change', this);
}
canRead(uid: number = getuid(), gid: number = getgid()): boolean {
if (this.perm & S.IROTH) {
return true;
}
Iif (gid === this.gid) {
Iif (this.perm & S.IRGRP) {
return true;
}
}
Iif (uid === this.uid) {
Iif (this.perm & S.IRUSR) {
return true;
}
}
return false;
}
canWrite(uid: number = getuid(), gid: number = getgid()): boolean {
if (this.perm & S.IWOTH) {
return true;
}
Iif (gid === this.gid) {
Iif (this.perm & S.IWGRP) {
return true;
}
}
Iif (uid === this.uid) {
Iif (this.perm & S.IWUSR) {
return true;
}
}
return false;
}
del() {
this.emit('delete', this);
}
toJSON() {
return {
ino: this.ino,
uid: this.uid,
gid: this.gid,
atime: this.atime.getTime(),
mtime: this.mtime.getTime(),
ctime: this.ctime.getTime(),
perm: this.perm,
mode: this.mode,
nlink: this.nlink,
symlink: this.symlink,
data: this.getString(),
};
}
}
/**
* Represents a hard link that points to an i-node `node`.
*/
export class Link extends EventEmitter {
vol: Volume;
parent: Link;
children = new Map<string, Link | undefined>();
// Path to this node as Array: ['usr', 'bin', 'node'].
private _steps: string[] = [];
// "i-node" of this hard link.
node: Node;
// "i-node" number of the node.
ino: number = 0;
// Number of children.
length: number = 0;
name: string;
get steps() {
return this._steps;
}
// Recursively sync children steps, e.g. in case of dir rename
set steps(val) {
this._steps = val;
for (const [child, link] of this.children.entries()) {
if (child === '.' || child === '..') {
continue;
}
link?.syncSteps();
}
}
constructor(vol: Volume, parent: Link, name: string) {
super();
this.vol = vol;
this.parent = parent;
this.name = name;
this.syncSteps();
}
setNode(node: Node) {
this.node = node;
this.ino = node.ino;
}
getNode(): Node {
return this.node;
}
createChild(name: string, node: Node = this.vol.createNode()): Link {
const link = new Link(this.vol, this, name);
link.setNode(node);
if (node.isDirectory()) {
link.children.set('.', link);
link.getNode().nlink++;
}
this.setChild(name, link);
return link;
}
setChild(name: string, link: Link = new Link(this.vol, this, name)): Link {
this.children.set(name, link);
link.parent = this;
this.length++;
const node = link.getNode();
if (node.isDirectory()) {
link.children.set('..', this);
this.getNode().nlink++;
}
this.getNode().mtime = new Date();
this.emit('child:add', link, this);
return link;
}
deleteChild(link: Link) {
const node = link.getNode();
if (node.isDirectory()) {
link.children.delete('..');
this.getNode().nlink--;
}
this.children.delete(link.getName());
this.length--;
this.getNode().mtime = new Date();
this.emit('child:delete', link, this);
}
getChild(name: string): Link | undefined {
this.getNode().mtime = new Date();
return this.children.get(name);
}
getPath(): string {
return this.steps.join(SEP);
}
getParentPath(): string {
return this.steps.slice(0, -1).join(SEP);
}
getName(): string {
return this.steps[this.steps.length - 1];
}
// del() {
// const parent = this.parent;
// if(parent) {
// parent.deleteChild(link);
// }
// this.parent = null;
// this.vol = null;
// }
/**
* Walk the tree path and return the `Link` at that location, if any.
* @param steps {string[]} Desired location.
* @param stop {number} Max steps to go into.
* @param i {number} Current step in the `steps` array.
*
* @return {Link|null}
*/
walk(steps: string[], stop: number = steps.length, i: number = 0): Link | null {
if (i >= steps.length) return this;
if (i >= stop) return this;
const step = steps[i];
const link = this.getChild(step);
if (!link) return null;
return link.walk(steps, stop, i + 1);
}
toJSON() {
return {
steps: this.steps,
ino: this.ino,
children: Array.from(this.children.keys()),
};
}
syncSteps() {
this.steps = this.parent ? this.parent.steps.concat([this.name]) : [this.name];
}
}
/**
* Represents an open file (file descriptor) that points to a `Link` (Hard-link) and a `Node`.
*/
export class File {
fd: number;
/**
* Hard link that this file opened.
* @type {any}
*/
link: Link;
/**
* Reference to a `Node`.
* @type {Node}
*/
node: Node;
/**
* A cursor/offset position in a file, where data will be written on write.
* User can "seek" this position.
*/
position: number;
// Flags used when opening the file.
flags: number;
/**
* Open a Link-Node pair. `node` is provided separately as that might be a different node
* rather the one `link` points to, because it might be a symlink.
* @param link
* @param node
* @param flags
* @param fd
*/
constructor(link: Link, node: Node, flags: number, fd: number) {
this.link = link;
this.node = node;
this.flags = flags;
this.fd = fd;
this.position = 0;
if (this.flags & O_APPEND) this.position = this.getSize();
}
getString(encoding = 'utf8'): string {
return this.node.getString();
}
setString(str: string) {
this.node.setString(str);
}
getBuffer(): Buffer {
return this.node.getBuffer();
}
setBuffer(buf: Buffer) {
this.node.setBuffer(buf);
}
getSize(): number {
return this.node.getSize();
}
truncate(len?: number) {
this.node.truncate(len);
}
seekTo(position: number) {
this.position = position;
}
stats(): Stats<number> {
return Stats.build(this.node) as Stats<number>;
}
write(buf: Buffer, offset: number = 0, length: number = buf.length, position?: number | null): number {
if (typeof position !== 'number') position = this.position;
const bytes = this.node.write(buf, offset, length, position);
this.position = position + bytes;
return bytes;
}
read(
buf: Buffer | ArrayBufferView | DataView,
offset: number = 0,
length: number = buf.byteLength,
position?: number,
): number {
if (typeof position !== 'number') position = this.position;
const bytes = this.node.read(buf, offset, length, position);
this.position = position + bytes;
return bytes;
}
chmod(perm: number) {
this.node.chmod(perm);
}
chown(uid: number, gid: number) {
this.node.chown(uid, gid);
}
}
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