browserfs
Version:
A filesystem in your browser!
224 lines • 34.7 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var file = require('../core/file');
var api_error_1 = require('../core/api_error');
var fs = require('../core/node_fs');
var PreloadFile = (function (_super) {
__extends(PreloadFile, _super);
function PreloadFile(_fs, _path, _flag, _stat, contents) {
_super.call(this);
this._pos = 0;
this._dirty = false;
this._fs = _fs;
this._path = _path;
this._flag = _flag;
this._stat = _stat;
if (contents != null) {
this._buffer = contents;
}
else {
this._buffer = new Buffer(0);
}
if (this._stat.size !== this._buffer.length && this._flag.isReadable()) {
throw new Error("Invalid buffer: Buffer is " + this._buffer.length + " long, yet Stats object specifies that file is " + this._stat.size + " long.");
}
}
PreloadFile.prototype.isDirty = function () {
return this._dirty;
};
PreloadFile.prototype.resetDirty = function () {
this._dirty = false;
};
PreloadFile.prototype.getBuffer = function () {
return this._buffer;
};
PreloadFile.prototype.getStats = function () {
return this._stat;
};
PreloadFile.prototype.getFlag = function () {
return this._flag;
};
PreloadFile.prototype.getPath = function () {
return this._path;
};
PreloadFile.prototype.getPos = function () {
if (this._flag.isAppendable()) {
return this._stat.size;
}
return this._pos;
};
PreloadFile.prototype.advancePos = function (delta) {
return this._pos += delta;
};
PreloadFile.prototype.setPos = function (newPos) {
return this._pos = newPos;
};
PreloadFile.prototype.sync = function (cb) {
try {
this.syncSync();
cb();
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.syncSync = function () {
throw new api_error_1.ApiError(api_error_1.ErrorCode.ENOTSUP);
};
PreloadFile.prototype.close = function (cb) {
try {
this.closeSync();
cb();
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.closeSync = function () {
throw new api_error_1.ApiError(api_error_1.ErrorCode.ENOTSUP);
};
PreloadFile.prototype.stat = function (cb) {
try {
cb(null, this._stat.clone());
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.statSync = function () {
return this._stat.clone();
};
PreloadFile.prototype.truncate = function (len, cb) {
try {
this.truncateSync(len);
if (this._flag.isSynchronous() && !fs.getRootFS().supportsSynch()) {
this.sync(cb);
}
cb();
}
catch (e) {
return cb(e);
}
};
PreloadFile.prototype.truncateSync = function (len) {
this._dirty = true;
if (!this._flag.isWriteable()) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EPERM, 'File not opened with a writeable mode.');
}
this._stat.mtime = new Date();
if (len > this._buffer.length) {
var buf = new Buffer(len - this._buffer.length);
buf.fill(0);
this.writeSync(buf, 0, buf.length, this._buffer.length);
if (this._flag.isSynchronous() && fs.getRootFS().supportsSynch()) {
this.syncSync();
}
return;
}
this._stat.size = len;
var newBuff = new Buffer(len);
this._buffer.copy(newBuff, 0, 0, len);
this._buffer = newBuff;
if (this._flag.isSynchronous() && fs.getRootFS().supportsSynch()) {
this.syncSync();
}
};
PreloadFile.prototype.write = function (buffer, offset, length, position, cb) {
try {
cb(null, this.writeSync(buffer, offset, length, position), buffer);
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.writeSync = function (buffer, offset, length, position) {
this._dirty = true;
if (position == null) {
position = this.getPos();
}
if (!this._flag.isWriteable()) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EPERM, 'File not opened with a writeable mode.');
}
var endFp = position + length;
if (endFp > this._stat.size) {
this._stat.size = endFp;
if (endFp > this._buffer.length) {
var newBuff = new Buffer(endFp);
this._buffer.copy(newBuff);
this._buffer = newBuff;
}
}
var len = buffer.copy(this._buffer, position, offset, offset + length);
this._stat.mtime = new Date();
if (this._flag.isSynchronous()) {
this.syncSync();
return len;
}
this.setPos(position + len);
return len;
};
PreloadFile.prototype.read = function (buffer, offset, length, position, cb) {
try {
cb(null, this.readSync(buffer, offset, length, position), buffer);
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.readSync = function (buffer, offset, length, position) {
if (!this._flag.isReadable()) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EPERM, 'File not opened with a readable mode.');
}
if (position == null) {
position = this.getPos();
}
var endRead = position + length;
if (endRead > this._stat.size) {
length = this._stat.size - position;
}
var rv = this._buffer.copy(buffer, offset, position, position + length);
this._stat.atime = new Date();
this._pos = position + length;
return rv;
};
PreloadFile.prototype.chmod = function (mode, cb) {
try {
this.chmodSync(mode);
cb();
}
catch (e) {
cb(e);
}
};
PreloadFile.prototype.chmodSync = function (mode) {
if (!this._fs.supportsProps()) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.ENOTSUP);
}
this._dirty = true;
this._stat.chmod(mode);
this.syncSync();
};
return PreloadFile;
}(file.BaseFile));
exports.PreloadFile = PreloadFile;
var NoSyncFile = (function (_super) {
__extends(NoSyncFile, _super);
function NoSyncFile(_fs, _path, _flag, _stat, contents) {
_super.call(this, _fs, _path, _flag, _stat, contents);
}
NoSyncFile.prototype.sync = function (cb) {
cb();
};
NoSyncFile.prototype.syncSync = function () { };
NoSyncFile.prototype.close = function (cb) {
cb();
};
NoSyncFile.prototype.closeSync = function () { };
return NoSyncFile;
}(PreloadFile));
exports.NoSyncFile = NoSyncFile;
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file = require('../core/file');\nimport file_system = require('../core/file_system');\nimport Stats from '../core/node_fs_stats';\nimport {FileFlag} from '../core/file_flag';\nimport {ApiError, ErrorCode} from '../core/api_error';\nimport fs = require('../core/node_fs');\n\n/**\n * An implementation of the File interface that operates on a file that is\n * completely in-memory. PreloadFiles are backed by a Buffer.\n *\n * This is also an abstract class, as it lacks an implementation of 'sync' and\n * 'close'. Each filesystem that wishes to use this file representation must\n * extend this class and implement those two methods.\n * @todo 'close' lever that disables functionality once closed.\n */\nexport class PreloadFile<T extends file_system.FileSystem> extends file.BaseFile {\n  private _pos: number = 0;\n  private _path: string;\n  protected _fs: T;\n  private _stat: Stats;\n  private _flag: FileFlag;\n  private _buffer: NodeBuffer;\n  private _dirty: boolean = false;\n  /**\n   * Creates a file with the given path and, optionally, the given contents. Note\n   * that, if contents is specified, it will be mutated by the file!\n   * @param [BrowserFS.FileSystem] _fs The file system that created the file.\n   * @param [String] _path\n   * @param [BrowserFS.FileMode] _mode The mode that the file was opened using.\n   *   Dictates permissions and where the file pointer starts.\n   * @param [BrowserFS.node.fs.Stats] _stat The stats object for the given file.\n   *   PreloadFile will mutate this object. Note that this object must contain\n   *   the appropriate mode that the file was opened as.\n   * @param [BrowserFS.node.Buffer?] contents A buffer containing the entire\n   *   contents of the file. PreloadFile will mutate this buffer. If not\n   *   specified, we assume it is a new file.\n   */\n  constructor(_fs: T, _path: string, _flag: FileFlag, _stat: Stats, contents?: NodeBuffer) {\n    super();\n    this._fs = _fs;\n    this._path = _path;\n    this._flag = _flag;\n    this._stat = _stat;\n    if (contents != null) {\n      this._buffer = contents;\n    } else {\n      // Empty buffer. It'll expand once we write stuff to it.\n      this._buffer = new Buffer(0);\n    }\n    // Note: This invariant is *not* maintained once the file starts getting\n    // modified.\n    // Note: Only actually matters if file is readable, as writeable modes may\n    // truncate/append to file.\n    if (this._stat.size !== this._buffer.length && this._flag.isReadable()) {\n      throw new Error(\"Invalid buffer: Buffer is \" + this._buffer.length + \" long, yet Stats object specifies that file is \" + this._stat.size + \" long.\");\n    }\n  }\n\n  protected isDirty(): boolean {\n    return this._dirty;\n  }\n\n  /**\n   * Resets the dirty bit. Should only be called after a sync has completed successfully.\n   */\n  protected resetDirty() {\n    this._dirty = false;\n  }\n\n  /**\n   * NONSTANDARD: Get the underlying buffer for this file. !!DO NOT MUTATE!! Will mess up dirty tracking.\n   */\n  public getBuffer(): NodeBuffer {\n    return this._buffer;\n  }\n\n  /**\n   * NONSTANDARD: Get underlying stats for this file. !!DO NOT MUTATE!!\n   */\n  public getStats(): Stats {\n    return this._stat;\n  }\n\n  public getFlag(): FileFlag {\n    return this._flag;\n  }\n\n  /**\n   * Get the path to this file.\n   * @return [String] The path to the file.\n   */\n  public getPath(): string {\n    return this._path;\n  }\n\n  /**\n   * Get the current file position.\n   *\n   * We emulate the following bug mentioned in the Node documentation:\n   * > On Linux, positional writes don't work when the file is opened in append\n   *   mode. The kernel ignores the position argument and always appends the data\n   *   to the end of the file.\n   * @return [Number] The current file position.\n   */\n  public getPos(): number {\n    if (this._flag.isAppendable()) {\n      return this._stat.size;\n    }\n    return this._pos;\n  }\n\n  /**\n   * Advance the current file position by the indicated number of positions.\n   * @param [Number] delta\n   */\n  public advancePos(delta: number): number {\n    return this._pos += delta;\n  }\n\n  /**\n   * Set the file position.\n   * @param [Number] newPos\n   */\n  public setPos(newPos: number): number {\n    return this._pos = newPos;\n  }\n\n  /**\n   * **Core**: Asynchronous sync. Must be implemented by subclasses of this\n   * class.\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public sync(cb: (e?: ApiError) => void): void {\n    try {\n      this.syncSync();\n      cb();\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * **Core**: Synchronous sync.\n   */\n  public syncSync(): void {\n    throw new ApiError(ErrorCode.ENOTSUP);\n  }\n\n  /**\n   * **Core**: Asynchronous close. Must be implemented by subclasses of this\n   * class.\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public close(cb: (e?: ApiError) => void): void {\n    try {\n      this.closeSync();\n      cb();\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * **Core**: Synchronous close.\n   */\n  public closeSync(): void {\n    throw new ApiError(ErrorCode.ENOTSUP);\n  }\n\n  /**\n   * Asynchronous `stat`.\n   * @param [Function(BrowserFS.ApiError, BrowserFS.node.fs.Stats)] cb\n   */\n  public stat(cb: (e: ApiError, stat?: Stats) => void): void {\n    try {\n      cb(null, this._stat.clone());\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * Synchronous `stat`.\n   */\n  public statSync(): Stats {\n    return this._stat.clone();\n  }\n\n  /**\n   * Asynchronous truncate.\n   * @param [Number] len\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public truncate(len: number, cb: (e?: ApiError) => void): void {\n    try {\n      this.truncateSync(len);\n      if (this._flag.isSynchronous() && !fs.getRootFS().supportsSynch()) {\n        this.sync(cb);\n      }\n      cb();\n    } catch (e) {\n      return cb(e);\n    }\n  }\n\n  /**\n   * Synchronous truncate.\n   * @param [Number] len\n   */\n  public truncateSync(len: number): void {\n    this._dirty = true;\n    if (!this._flag.isWriteable()) {\n      throw new ApiError(ErrorCode.EPERM, 'File not opened with a writeable mode.');\n    }\n    this._stat.mtime = new Date();\n    if (len > this._buffer.length) {\n      var buf = new Buffer(len - this._buffer.length);\n      buf.fill(0);\n      // Write will set @_stat.size for us.\n      this.writeSync(buf, 0, buf.length, this._buffer.length);\n      if (this._flag.isSynchronous() && fs.getRootFS().supportsSynch()) {\n        this.syncSync();\n      }\n      return;\n    }\n    this._stat.size = len;\n    // Truncate buffer to 'len'.\n    var newBuff = new Buffer(len);\n    this._buffer.copy(newBuff, 0, 0, len);\n    this._buffer = newBuff;\n    if (this._flag.isSynchronous() && fs.getRootFS().supportsSynch()) {\n      this.syncSync();\n    }\n  }\n\n  /**\n   * Write buffer to the file.\n   * Note that it is unsafe to use fs.write multiple times on the same file\n   * without waiting for the callback.\n   * @param [BrowserFS.node.Buffer] buffer Buffer containing the data to write to\n   *  the file.\n   * @param [Number] offset Offset in the buffer to start reading data from.\n   * @param [Number] length The amount of bytes to write to the file.\n   * @param [Number] position Offset from the beginning of the file where this\n   *   data should be written. If position is null, the data will be written at\n   *   the current position.\n   * @param [Function(BrowserFS.ApiError, Number, BrowserFS.node.Buffer)]\n   *   cb The number specifies the number of bytes written into the file.\n   */\n  public write(buffer: NodeBuffer, offset: number, length: number, position: number, cb: (e: ApiError, len?: number, buff?: NodeBuffer) => void): void {\n    try {\n      cb(null, this.writeSync(buffer, offset, length, position), buffer);\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * Write buffer to the file.\n   * Note that it is unsafe to use fs.writeSync multiple times on the same file\n   * without waiting for the callback.\n   * @param [BrowserFS.node.Buffer] buffer Buffer containing the data to write to\n   *  the file.\n   * @param [Number] offset Offset in the buffer to start reading data from.\n   * @param [Number] length The amount of bytes to write to the file.\n   * @param [Number] position Offset from the beginning of the file where this\n   *   data should be written. If position is null, the data will be written at\n   *   the current position.\n   * @return [Number]\n   */\n  public writeSync(buffer: NodeBuffer, offset: number, length: number, position: number): number {\n    this._dirty = true;\n    if (position == null) {\n      position = this.getPos();\n    }\n    if (!this._flag.isWriteable()) {\n      throw new ApiError(ErrorCode.EPERM, 'File not opened with a writeable mode.');\n    }\n    var endFp = position + length;\n    if (endFp > this._stat.size) {\n      this._stat.size = endFp;\n      if (endFp > this._buffer.length) {\n        // Extend the buffer!\n        var newBuff = new Buffer(endFp);\n        this._buffer.copy(newBuff);\n        this._buffer = newBuff;\n      }\n    }\n    var len = buffer.copy(this._buffer, position, offset, offset + length);\n    this._stat.mtime = new Date();\n    if (this._flag.isSynchronous()) {\n      this.syncSync();\n      return len;\n    }\n    this.setPos(position + len);\n    return len;\n  }\n\n  /**\n   * Read data from the file.\n   * @param [BrowserFS.node.Buffer] buffer The buffer that the data will be\n   *   written to.\n   * @param [Number] offset The offset within the buffer where writing will\n   *   start.\n   * @param [Number] length An integer specifying the number of bytes to read.\n   * @param [Number] position An integer specifying where to begin reading from\n   *   in the file. If position is null, data will be read from the current file\n   *   position.\n   * @param [Function(BrowserFS.ApiError, Number, BrowserFS.node.Buffer)] cb The\n   *   number is the number of bytes read\n   */\n  public read(buffer: NodeBuffer, offset: number, length: number, position: number, cb: (e: ApiError, len?: number, buff?: NodeBuffer) => void): void {\n    try {\n      cb(null, this.readSync(buffer, offset, length, position), buffer);\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * Read data from the file.\n   * @param [BrowserFS.node.Buffer] buffer The buffer that the data will be\n   *   written to.\n   * @param [Number] offset The offset within the buffer where writing will\n   *   start.\n   * @param [Number] length An integer specifying the number of bytes to read.\n   * @param [Number] position An integer specifying where to begin reading from\n   *   in the file. If position is null, data will be read from the current file\n   *   position.\n   * @return [Number]\n   */\n  public readSync(buffer: NodeBuffer, offset: number, length: number, position: number): number {\n    if (!this._flag.isReadable()) {\n      throw new ApiError(ErrorCode.EPERM, 'File not opened with a readable mode.');\n    }\n    if (position == null) {\n      position = this.getPos();\n    }\n    var endRead = position + length;\n    if (endRead > this._stat.size) {\n      length = this._stat.size - position;\n    }\n    var rv = this._buffer.copy(buffer, offset, position, position + length);\n    this._stat.atime = new Date();\n    this._pos = position + length;\n    return rv;\n  }\n\n  /**\n   * Asynchronous `fchmod`.\n   * @param [Number|String] mode\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public chmod(mode: number, cb: (e?: ApiError) => void): void {\n    try {\n      this.chmodSync(mode);\n      cb();\n    } catch (e) {\n      cb(e);\n    }\n  }\n\n  /**\n   * Asynchronous `fchmod`.\n   * @param [Number] mode\n   */\n  public chmodSync(mode: number): void {\n    if (!this._fs.supportsProps()) {\n      throw new ApiError(ErrorCode.ENOTSUP);\n    }\n    this._dirty = true;\n    this._stat.chmod(mode);\n    this.syncSync();\n  }\n}\n\n/**\n * File class for the InMemory and XHR file systems.\n * Doesn't sync to anything, so it works nicely for memory-only files.\n */\nexport class NoSyncFile<T extends file_system.FileSystem> extends PreloadFile<T> implements file.File {\n  constructor(_fs: T, _path: string, _flag: FileFlag, _stat: Stats, contents?: NodeBuffer) {\n    super(_fs, _path, _flag, _stat, contents);\n  }\n  /**\n   * Asynchronous sync. Doesn't do anything, simply calls the cb.\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public sync(cb: (e?: ApiError) => void): void {\n    cb();\n  }\n  /**\n   * Synchronous sync. Doesn't do anything.\n   */\n  public syncSync(): void {}\n  /**\n   * Asynchronous close. Doesn't do anything, simply calls the cb.\n   * @param [Function(BrowserFS.ApiError)] cb\n   */\n  public close(cb: (e?: ApiError) => void): void {\n    cb();\n  }\n  /**\n   * Synchronous close. Doesn't do anything.\n   */\n  public closeSync(): void {}\n}\n"]}