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import process from '../process';
import { Buffer, bufferAllocUnsafe, bufferFrom } from '../vendor/node/internal/buffer';
import { constants, S } from '../constants';
export type NodeEventModify = [type: 'modify'];
export type NodeEventDelete = [type: 'delete'];
export type NodeEvent = NodeEventModify | NodeEventDelete;
const { S_IFMT, S_IFDIR, S_IFREG, S_IFLNK, S_IFCHR } = constants;
const getuid = (): number => process.getuid?.() ?? 0;
const getgid = (): number => process.getgid?.() ?? 0;
const EMPTY_BUFFER = bufferAllocUnsafe(0);
/**
* Node in a file system (like i-node, v-node).
*/
export class Node {
public readonly changes = new FanOut<NodeEvent>();
// 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();
buf: Buffer = EMPTY_BUFFER;
/** Total allocated memory capacity for this node. */
private capacity: number = 0;
/** Actually used bytes to store content. */
private size: number = 0;
rdev: number = 0;
mode: number; // S_IFDIR, S_IFREG, etc..
// Number of hard links pointing at this Node.
private _nlink = 1;
// Path to another node, if this is a symlink.
symlink: string;
constructor(ino: number, mode: number = 0o666) {
this.mode = mode;
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;
}
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 get perm(): number {
return this.mode & ~S_IFMT;
}
public set perm(perm: number) {
this.mode = (this.mode & S_IFMT) | (perm & ~S_IFMT);
this.ctime = new Date();
}
public set nlink(nlink: number) {
this._nlink = nlink;
this.ctime = new Date();
}
public get nlink(): number {
return this._nlink;
}
getString(encoding: BufferEncoding = 'utf8'): string {
this.atime = new Date();
return this.getBuffer().toString(encoding);
}
setString(str: string) {
this._setBuf(bufferFrom(str, 'utf8'));
}
getBuffer(): Buffer {
this.atime = new Date();
Iif (!this.buf) this.buf = bufferAllocUnsafe(0);
return bufferFrom(this.buf.subarray(0, this.size)); // Return a copy of used portion.
}
setBuffer(buf: Buffer) {
const copy = bufferFrom(buf); // Creates a copy of data.
this._setBuf(copy);
}
private _setBuf(buf: Buffer): void {
const size = buf.length;
this.buf = buf;
this.capacity = size;
this.size = size;
this.touch();
}
getSize(): number {
return this.size;
}
setModeProperty(property: number) {
this.mode = property;
}
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;
}
isCharacterDevice() {
return (this.mode & S_IFMT) === S_IFCHR;
}
makeSymlink(symlink: string) {
this.mode = S_IFLNK | 0o666;
this.symlink = symlink;
}
write(buf: Buffer, off: number = 0, len: number = buf.length, pos: number = 0): number {
const bufLength = buf.length;
Iif (off + len > bufLength) len = bufLength - off;
Iif (len <= 0) return 0;
const requiredSize = pos + len;
if (requiredSize > this.capacity) {
let newCapacity = Math.max(this.capacity * 2, 64);
while (newCapacity < requiredSize) newCapacity *= 2;
const newBuf = bufferAllocUnsafe(newCapacity);
if (this.size > 0) this.buf.copy(newBuf, 0, 0, this.size);
this.buf = newBuf;
this.capacity = newCapacity;
}
if (pos > this.size) this.buf.fill(0, this.size, pos);
buf.copy(this.buf, pos, off, off + len);
if (requiredSize > this.size) this.size = requiredSize;
this.touch();
return len;
}
/**
* Read data from the file.
*
* @param buf Buffer to read data into.
* @param off Offset int the `buf` where to start writing data.
* @param len How many bytes to read. Equals to `buf.byteLength` by default.
* @param pos Position offset in file where to start reading. Defaults to `0`.
* @returns 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 (pos >= this.size) return 0;
let actualLen = len;
Iif (actualLen > buf.byteLength) actualLen = buf.byteLength;
if (actualLen + pos > this.size) actualLen = this.size - pos;
Iif (actualLen <= 0) return 0;
const buf2 = buf instanceof Buffer ? buf : Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
this.buf.copy(buf2, off, pos, pos + actualLen);
return actualLen;
}
truncate(len: number = 0) {
if (!len) {
this.buf = EMPTY_BUFFER;
this.capacity = 0;
this.size = 0;
this.touch();
return;
}
if (len <= this.size) this.size = len;
else {
Iif (len > this.capacity) {
let newCapacity = Math.max(this.capacity * 2, 64);
while (newCapacity < len) newCapacity *= 2;
const buf = bufferAllocUnsafe(newCapacity);
Iif (this.size > 0) this.buf.copy(buf, 0, 0, this.size);
buf.fill(0, this.size, len);
this.buf = buf;
this.capacity = newCapacity;
} else this.buf.fill(0, this.size, len);
this.size = len;
}
this.touch();
}
chmod(perm: number) {
this.mode = (this.mode & S_IFMT) | (perm & ~S_IFMT);
this.touch();
}
chown(uid: number, gid: number) {
this.uid = uid;
this.gid = gid;
this.touch();
}
touch() {
this.mtime = new Date();
this.changes.emit(['modify']);
}
canRead(uid: number = getuid(), gid: number = getgid()): boolean {
if (this.perm & S.IROTH) {
return true;
}
if (gid === this.gid) {
Iif (this.perm & S.IRGRP) {
return true;
}
}
if (uid === this.uid) {
if (this.perm & S.IRUSR) {
return true;
}
}
return false;
}
canWrite(uid: number = getuid(), gid: number = getgid()): boolean {
if (this.perm & S.IWOTH) {
return true;
}
if (gid === this.gid) {
Iif (this.perm & S.IWGRP) {
return true;
}
}
if (uid === this.uid) {
if (this.perm & S.IWUSR) {
return true;
}
}
return false;
}
canExecute(uid: number = getuid(), gid: number = getgid()): boolean {
if (this.perm & S.IXOTH) {
return true;
}
if (gid === this.gid) {
Iif (this.perm & S.IXGRP) {
return true;
}
}
if (uid === this.uid) {
Iif (this.perm & S.IXUSR) {
return true;
}
}
return false;
}
del() {
this.changes.emit(['delete']);
}
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(),
};
}
}
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