"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.File = exports.Link = exports.Node = exports.SEP = void 0;
const process_1 = require("./process");
const buffer_1 = require("./internal/buffer");
const constants_1 = require("./constants");
const events_1 = require("events");
const Stats_1 = require("./Stats");
const { S_IFMT, S_IFDIR, S_IFREG, S_IFLNK, O_APPEND } = constants_1.constants;
const getuid = () => { var _a, _b; return (_b = (_a = process_1.default.getuid) === null || _a === void 0 ? void 0 : _a.call(process_1.default)) !== null && _b !== void 0 ? _b : 0; };
const getgid = () => { var _a, _b; return (_b = (_a = process_1.default.getgid) === null || _a === void 0 ? void 0 : _a.call(process_1.default)) !== null && _b !== void 0 ? _b : 0; };
exports.SEP = '/';
/**
* Node in a file system (like i-node, v-node).
*/
class Node extends events_1.EventEmitter {
constructor(ino, perm = 0o666) {
super();
// User ID and group ID.
this._uid = getuid();
this._gid = getgid();
this._atime = new Date();
this._mtime = new Date();
this._ctime = new Date();
this._perm = 0o666; // Permissions `chmod`, `fchmod`
this.mode = S_IFREG; // S_IFDIR, S_IFREG, etc.. (file by default?)
// Number of hard links pointing at this Node.
this._nlink = 1;
this._perm = perm;
this.mode |= perm;
this.ino = ino;
}
set ctime(ctime) {
this._ctime = ctime;
}
get ctime() {
return this._ctime;
}
set uid(uid) {
this._uid = uid;
this.ctime = new Date();
}
get uid() {
return this._uid;
}
set gid(gid) {
this._gid = gid;
this.ctime = new Date();
}
get gid() {
return this._gid;
}
set atime(atime) {
this._atime = atime;
this.ctime = new Date();
}
get atime() {
return this._atime;
}
set mtime(mtime) {
this._mtime = mtime;
this.ctime = new Date();
}
get mtime() {
return this._mtime;
}
set perm(perm) {
this._perm = perm;
this.ctime = new Date();
}
get perm() {
return this._perm;
}
set nlink(nlink) {
this._nlink = nlink;
this.ctime = new Date();
}
get nlink() {
return this._nlink;
}
getString(encoding = 'utf8') {
this.atime = new Date();
return this.getBuffer().toString(encoding);
}
setString(str) {
// this.setBuffer(bufferFrom(str, 'utf8'));
this.buf = (0, buffer_1.bufferFrom)(str, 'utf8');
this.touch();
}
getBuffer() {
this.atime = new Date();
if (!this.buf)
this.setBuffer((0, buffer_1.bufferAllocUnsafe)(0));
return (0, buffer_1.bufferFrom)(this.buf); // Return a copy.
}
setBuffer(buf) {
this.buf = (0, buffer_1.bufferFrom)(buf); // Creates a copy of data.
this.touch();
}
getSize() {
return this.buf ? this.buf.length : 0;
}
setModeProperty(property) {
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) {
this.symlink = steps;
this.setIsSymlink();
}
write(buf, off = 0, len = buf.length, pos = 0) {
if (!this.buf)
this.buf = (0, buffer_1.bufferAllocUnsafe)(0);
if (pos + len > this.buf.length) {
const newBuf = (0, buffer_1.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, off = 0, len = buf.byteLength, pos = 0) {
this.atime = new Date();
if (!this.buf)
this.buf = (0, buffer_1.bufferAllocUnsafe)(0);
let actualLen = len;
if (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 = 0) {
if (!len)
this.buf = (0, buffer_1.bufferAllocUnsafe)(0);
else {
if (!this.buf)
this.buf = (0, buffer_1.bufferAllocUnsafe)(0);
if (len <= this.buf.length) {
this.buf = this.buf.slice(0, len);
}
else {
const buf = (0, buffer_1.bufferAllocUnsafe)(len);
this.buf.copy(buf);
buf.fill(0, this.buf.length);
this.buf = buf;
}
}
this.touch();
}
chmod(perm) {
this.perm = perm;
this.mode = (this.mode & ~0o777) | perm;
this.touch();
}
chown(uid, gid) {
this.uid = uid;
this.gid = gid;
this.touch();
}
touch() {
this.mtime = new Date();
this.emit('change', this);
}
canRead(uid = getuid(), gid = getgid()) {
if (this.perm & 4 /* S.IROTH */) {
return true;
}
if (gid === this.gid) {
if (this.perm & 32 /* S.IRGRP */) {
return true;
}
}
if (uid === this.uid) {
if (this.perm & 256 /* S.IRUSR */) {
return true;
}
}
return false;
}
canWrite(uid = getuid(), gid = getgid()) {
if (this.perm & 2 /* S.IWOTH */) {
return true;
}
if (gid === this.gid) {
if (this.perm & 16 /* S.IWGRP */) {
return true;
}
}
if (uid === this.uid) {
if (this.perm & 128 /* 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(),
};
}
}
exports.Node = Node;
/**
* Represents a hard link that points to an i-node `node`.
*/
class Link extends events_1.EventEmitter {
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 Object.entries(this.children)) {
if (child === '.' || child === '..') {
continue;
}
link === null || link === void 0 ? void 0 : link.syncSteps();
}
}
constructor(vol, parent, name) {
super();
this.children = {};
// Path to this node as Array: ['usr', 'bin', 'node'].
this._steps = [];
// "i-node" number of the node.
this.ino = 0;
// Number of children.
this.length = 0;
this.vol = vol;
this.parent = parent;
this.name = name;
this.syncSteps();
}
setNode(node) {
this.node = node;
this.ino = node.ino;
}
getNode() {
return this.node;
}
createChild(name, node = this.vol.createNode()) {
const link = new Link(this.vol, this, name);
link.setNode(node);
if (node.isDirectory()) {
link.children['.'] = link;
link.getNode().nlink++;
}
this.setChild(name, link);
return link;
}
setChild(name, link = new Link(this.vol, this, name)) {
this.children[name] = link;
link.parent = this;
this.length++;
const node = link.getNode();
if (node.isDirectory()) {
link.children['..'] = this;
this.getNode().nlink++;
}
this.getNode().mtime = new Date();
this.emit('child:add', link, this);
return link;
}
deleteChild(link) {
const node = link.getNode();
if (node.isDirectory()) {
delete link.children['..'];
this.getNode().nlink--;
}
delete this.children[link.getName()];
this.length--;
this.getNode().mtime = new Date();
this.emit('child:delete', link, this);
}
getChild(name) {
this.getNode().mtime = new Date();
if (Object.hasOwnProperty.call(this.children, name)) {
return this.children[name];
}
}
getPath() {
return this.steps.join(exports.SEP);
}
getName() {
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, stop = steps.length, i = 0) {
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: Object.keys(this.children),
};
}
syncSteps() {
this.steps = this.parent ? this.parent.steps.concat([this.name]) : [this.name];
}
}
exports.Link = Link;
/**
* Represents an open file (file descriptor) that points to a `Link` (Hard-link) and a `Node`.
*/
class File {
/**
* 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, node, flags, fd) {
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') {
return this.node.getString();
}
setString(str) {
this.node.setString(str);
}
getBuffer() {
return this.node.getBuffer();
}
setBuffer(buf) {
this.node.setBuffer(buf);
}
getSize() {
return this.node.getSize();
}
truncate(len) {
this.node.truncate(len);
}
seekTo(position) {
this.position = position;
}
stats() {
return Stats_1.default.build(this.node);
}
write(buf, offset = 0, length = buf.length, position) {
if (typeof position !== 'number')
position = this.position;
const bytes = this.node.write(buf, offset, length, position);
this.position = position + bytes;
return bytes;
}
read(buf, offset = 0, length = buf.byteLength, position) {
if (typeof position !== 'number')
position = this.position;
const bytes = this.node.read(buf, offset, length, position);
this.position = position + bytes;
return bytes;
}
chmod(perm) {
this.node.chmod(perm);
}
chown(uid, gid) {
this.node.chown(uid, gid);
}
}
exports.File = File;