Refactoring away from promises.
This commit is contained in:
Alan Kligman
parent
3daebb73ad
commit
f762cf74b1
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@ -3,6 +3,9 @@
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<head>
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<meta charset="utf-8" />
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</head>
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<body>
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<div id="stdout"></div>
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</body>
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<script src="../lib/require.js"></script>
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<script>
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require.config({
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@ -12,14 +15,36 @@ require.config({
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}
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});
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require(["../../javascript-debug/debug", "src/filesystem"], function(debug, FileSystem) {
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var fs = new FileSystem(undefined, true);
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require(["../../javascript-debug/debug", "src/filesystem"], function(debug, IDBFS) {
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IDBFS.mount("default", function(error, fs) {
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console.log("mount complete");
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fs.mkdir("/tmp", function(error) {
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fs.dump(document.getElementById("stdout"));
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});
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}, true);
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/*
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var fs = new IdbFS(undefined, true);
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fs.then(function(fs) {
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fs.mkdir("/tmp");
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fs.mkdir("/tmp").then(function(result) {
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var d = fs.open("/tmp/0", IdbFS.O_CREATE, IdbFS.FMODE_RW);
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d.then(function(fd) {
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fs.dump(document.getElementById("stdout"));
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}, function(e) {
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console.log(e);
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});
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}, function(error) {
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console.log(error);
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});
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fs.stat("/tmp").then(function(result) {
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console.log(result);
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}, function(error) {
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console.log(error);
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});
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});
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*/
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});
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</script>
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</html>
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@ -12,7 +12,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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*/
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define(function(require) {
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'use strict';
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// 'use strict';
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var when = require("when");
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var debug = require("debug");
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@ -24,6 +24,9 @@ define(function(require) {
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var TEMPORARY = 0;
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var PERSISTENT = 1;
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var MIME_DIRECTORY = "application/directory";
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var MIME_FILE = "application/file";
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function guid() {
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
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var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
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@ -46,33 +49,32 @@ define(function(require) {
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return components.join("/");
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}
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function FileError(code) {
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this.code = code;
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// FIXME: add a message field with the text error
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};
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FileError.NOT_FOUND_ERR = 1;
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FileError.SECURITY_ERR = 2;
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FileError.ABORT_ERR = 3;
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FileError.NOT_READABLE_ERR = 4;
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FileError.ENCODING_ERR = 5;
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FileError.NO_MODIFICATION_ALLOWED_ERR = 6;
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FileError.INVALID_STATE_ERR = 7;
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FileError.SYNTAX_ERR = 8;
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FileError.INVALID_MODIFICATION_ERR = 9;
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FileError.QUOTA_EXCEEDED_ERR = 10;
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FileError.TYPE_MISMATCH_ERR = 11;
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FileError.PATH_EXISTS_ERR = 12;
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function makeDirectoryEntry(name, modtime) {
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var parent = ("/" === name) ? null : dirname(name);
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return {
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"parent": parent,
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"name": name,
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"content-type": "application/directory",
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"last-modified": modtime || Date.now()
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}
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}
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function DirectoryError(code) {
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this.code = code;
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// FIXME: add a message field with the text error
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};
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DirectoryError.PATH_EXISTS_ERR = 1;
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DirectoryError.MISSING_PATH_COMPONENT_ERR = 2;
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function makeFileEntry(name, oid, size, modtime) {
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var parent = ("/" === name) ? null : dirname(name);
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return {
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"parent": parent,
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"name": name,
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"content-type": "application/file",
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"last-modified": modtime || Date.now(),
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"size": size || 0,
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"object-id": oid || guid()
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}
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}
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var RO = "readonly",
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RW = "readwrite";
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/*
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function FileSystem(name, optFormat) {
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function Transaction(db, scope, mode) {
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var id = this.id = guid();
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@ -98,14 +100,14 @@ define(function(require) {
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var deferred = when.defer();
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this._IdbRequest.onsuccess = function(e) {
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deferred.resolve(e);
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clearPending(id);
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// clearPending(id);
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};
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this._IdbRequest.onerror = function(e) {
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deferred.reject(e);
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clearPending(id);
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// clearPending(id);
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};
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this.then = deferred.promise.then;
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queuePending(this, id);
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// queuePending(this, id);
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}
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function OpenDBRequest(request, upgrade) {
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@ -128,8 +130,11 @@ define(function(require) {
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}
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var fs = this;
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fs.id = guid();
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var FILE_STORE_NAME = "files";
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var METADATA_STORE_NAME = "metadata";
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var NAME_INDEX = "name";
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var PARENT_INDEX = "parent";
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fs.name = name || "default";
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fs.pending = {};
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@ -185,8 +190,8 @@ define(function(require) {
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db.deleteObjectStore(FILE_STORE_NAME);
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}
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var metadata = db.createObjectStore(METADATA_STORE_NAME);
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metadata.createIndex("parent", "parent", {unique: false});
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metadata.createIndex("name", "name", {unique: true});
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metadata.createIndex(NAME_INDEX, "parent", {unique: false});
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metadata.createIndex(NAME_INDEX, "name", {unique: true});
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var files = db.createObjectStore(FILE_STORE_NAME);
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format = true;
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@ -200,7 +205,7 @@ define(function(require) {
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debug.info("format required");
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var clearRequest = new Request(store.clear());
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clearRequest.then(function() {
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mkdir("/", transaction).then(function() {
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mkdir(transation, "/").then(function() {
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debug.info("format complete");
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});
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});
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@ -209,49 +214,75 @@ define(function(require) {
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// API
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var mkdir = this.mkdir = function mkdir(name, transaction) {
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debug.info("mkdir invoked");
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function updateLastModified(transaction, name, timestamp) {
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debug.info("updateLastModified invoked");
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var deferred = when.defer();
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var transaction = transaction || new Transaction(fs.db, [METADATA_STORE_NAME], RW);
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transaction = transaction || new Transaction(fs.db, [METADATA_STORE_NAME], RW);
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timestamp = timestamp || Date.now();
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index("name");
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var getRequest = new Request(nameIndex.get(name));
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getRequest.then(function(e) {
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var result = e.target.result;
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if(result) {
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debug.info("mkdir error: PATH_EXISTS_ERR");
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deferred.reject(new DirectoryError(DirectoryError.PATH_EXISTS_ERR));
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} else {
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var parent = ("/" === name) ? null : dirname(name);
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var directoryRequest = new Request(store.put({
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"parent": parent,
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"name": name,
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"last-modified": Date.now(),
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"content-type": "application/directory"
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}, name));
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directoryRequest.then(function(e) {
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debug.info("mkdir complete");
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deferred.resolve();
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});
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}
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});
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return deferred.promise;
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};
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var stat = this.stat = function stat(name, transaction) {
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debug.info("stat invoked");
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var deferred = when.defer();
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var transaction = transaction || new Transaction(fs.db, [METADATA_STORE_NAME], RO);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index("name");
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var nameIndex = store.index(NAME_INDEX);
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var getRequest = new Request(nameIndex.get(name));
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getRequest.then(function(e) {
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var result = e.target.result;
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if(!result) {
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debug.info("stat error: MISSING_PATH_COMPONENT_ERR");
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deferred.reject(new DirectoryError(DirectoryError.MISSING_PATH_COMPONENT_ERR));
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debug.info("updateLastModified error: E_NOENT");
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deferred.reject(new FileSystemError(T_NONE, E_NOENT));
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} else {
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result["last-modified"] = timestamp;
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var updateRequest = new Request(store.put(result, result.name));
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updateRequest.then(function(e) {
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debug.info("updateLastModified complete");
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deferred.resolve();
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});
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}
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});
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return deferred.promise;
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}
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function mkdir(transaction, name) {
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debug.info("mkdir invoked");
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var deferred = when.defer();
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transaction = transaction || new Transaction(fs.db, [METADATA_STORE_NAME], RW);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index(NAME_INDEX);
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var getRequest = new Request(nameIndex.get(name));
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getRequest.then(function(e) {
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var result = e.target.result;
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if(result) {
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debug.info("mkdir error: E_EXIST");
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deferred.reject(new FileSystemError(T_MKDIR, E_EXIST));
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} else {
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var entry = makeDirectoryEntry(name, Date.now());
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var directoryRequest = new Request(store.put(entry, name));
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directoryRequest.then(function(e) {
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debug.info("mkdir complete");
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deferred.resolve();
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}, function(e) {
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debug.info("mkdir error: " + e);
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deferred.reject(e);
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});
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}
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});
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return deferred.promise;
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}
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fs.mkdir = mkdir.bind(null, null);
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function stat(transaction, name) {
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debug.info("stat invoked");
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var deferred = when.defer();
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transaction = transaction || new Transaction(fs.db, [METADATA_STORE_NAME], RO);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index(NAME_INDEX);
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var getRequest = new Request(nameIndex.get(name));
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getRequest.then(function(e) {
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var result = e.target.result;
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if(!result) {
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debug.info("stat error: E_NOENT");
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deferred.reject(new FileSystemError(T_STAT, E_NOENT));
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} else {
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debug.info("stat complete");
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deferred.resolve(result);
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@ -259,11 +290,336 @@ define(function(require) {
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});
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return deferred.promise;
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}
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fs.stat = stat.bind(null, null);
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function OpenFileDescription(filesystem, name, oid, flags, mode) {
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this.fs = filesystem;
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this.name = name;
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this.oid = oid;
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this.fags = flags;
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this.mode = mode;
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this.offset = 0;
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}
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var fds = {};
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function FileDescriptor(ofd) {
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this.descriptor = guid();
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fds[this.descriptor] = ofd;
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}
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// Close a file
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FileDescriptor.prototype.close = function close() {
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debug.info("close invoked");
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var deferred = when();
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delete fds[this.descriptor];
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debug.info("close complete");
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return deferred.promise;
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};
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// Read from a file
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FileDescriptor.prototype.read = function read(bytes, buffer) {
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};
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// Write to a file
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FileDescriptor.prototype.write = function write(bytes, buffer) {
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};
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// Set absolute offset
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FileDescriptor.prototype.seek = function seek(offset) {
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this.offset = offset;
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};
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// Set relative offset (from current offset)
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FileDescriptor.prototype.rseek = function rseek(offset) {
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this.offset += offset;
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};
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function open(name, flags, mode) {
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debug.info("open invoked");
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var deferred = when.defer();
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var transaction = new Transaction(fs.db, [METADATA_STORE_NAME], RW);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index(NAME_INDEX);
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var metadataRequest = new Request(nameIndex.get(name));
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metadataRequest.then(function(e) {
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var result = e.target.result;
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if(!result && !(flags & FileSystem.O_CREATE)) {
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debug.info("open error: E_NOENT");
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deferred.reject(new FileSystemError(T_OPEN, E_NOENT));
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} else if(result && "application/directory" === result["content-type"] && mode === FileSystem.FMODE_RW) {
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debug.info("open error: E_ISDIR");
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deferred.reject(new FileSystemError(T_OPEN, E_ISDIR));
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} else {
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function complete() {
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var ofd = new OpenFileDescription(fs, name, result["object-id"], flags, mode);
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var fd = new FileDescriptor(ofd);
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debug.info("open complete");
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deferred.resolve(fd);
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}
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if(!result) {
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result = makeFileEntry(name);
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var makeRequest = new Request(store.put(result, name));
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makeRequest.then(complete);
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} else {
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complete();
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}
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}
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});
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return deferred.promise;
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}
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fs.open = open;
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function dump(element) {
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element.innerHTML = "";
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var transaction = new Transaction(fs.db, [METADATA_STORE_NAME], RO);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var cursorRequest = store.openCursor();
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cursorRequest.onsuccess = function(e) {
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var cursor = e.target.result;
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if(cursor) {
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var getRequest = store.get(cursor.key);
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getRequest.onsuccess = function(e) {
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var result = e.target.result;
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element.innerHTML += JSON.stringify(result) + "<br>";
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cursor.continue();
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};
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}
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};
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}
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this.dump = dump;
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}
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// File system states
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FileSystem.READY = 0;
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FileSystem.PENDING = 1;
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FileSystem.UNINITIALIZED = 2;
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// Open flags
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FileSystem.O_CREATE = 0x1;
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FileSystem.O_TRUNCATE = 0x2;
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// Open modes
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FileSystem.FMODE_RO = 0;
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FileSystem.FMODE_RW = 1;
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*/
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/////////////////////////////////////////////////////////////////////////////
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return FileSystem;
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var METADATA_STORE_NAME = "metadata";
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var FILE_STORE_NAME = "files";
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var NAME_INDEX = "name";
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var NAME_INDEX_KEY_PATH = "name";
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var PARENT_INDEX = "parent";
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var PARENT_INDEX_KEY_PATH = "parent";
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var IDB_RO = "readonly";
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var IDB_RW = "readwrite";
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function IDBFSError(type, code) {
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this.type = type;
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this.code = code;
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}
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// Types
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var T_OPEN = 0x0;
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var T_MKDIR = 0x1;
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var T_STAT = 0x2;
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var T_NONE = 0x3;
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// Codes
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var E_EXIST = 0x0;
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var E_ISDIR = 0x1;
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var E_NOENT = 0x2;
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function genericIDBErrorHandler(scope, callback) {
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return function(error) {
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debug.error("[" + scope + "] error: ", error);
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if(callback && "function" === typeof callback) {
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callback.call(undefined, error);
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}
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}
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}
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function FileSystem(db) {
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var fs = this;
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var pending = {}; // Pending transactions
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var fds = {}; // Open file descriptors
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// Internal prototypes
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function OpenFileDescription(name, oid, flags, mode) {
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this.fs = filesystem;
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this.name = name;
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this.oid = oid;
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this.flags = flags;
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this.mode = mode;
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this.pointer = 0;
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}
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function FileDescriptor(ofd) {
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this.descriptor = guid();
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fds[this.descriptor] = ofd;
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function read(buffer, bytes, callback) {
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}
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function write(buffer, bytes, callback) {
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}
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function seek(offset, whence, callback) {
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}
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}
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// API
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function open(pathname, flags, mode, callback) {
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}
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function close(fd, callback) {
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}
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function mkdir(transaction, pathname, callback) {
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debug.info("mkdir invoked");
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transaction = transaction || db.transaction([METADATA_STORE_NAME], IDB_RW);
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var store = transaction.objectStore(METADATA_STORE_NAME);
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var nameIndex = store.index(NAME_INDEX);
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var onerror = genericIDBErrorHandler("mkdir", callback);
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var getRequest = nameIndex.get(pathname);
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getRequest.onsuccess = function(e) {
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var result = e.target.result;
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if(result) {
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onerror(new IDBFSError(T_MKDIR, E_EXIST));
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} else {
|
||||
var entry = makeDirectoryEntry(pathname, Date.now());
|
||||
var directoryRequest = store.put(entry, pathname);
|
||||
directoryRequest.onsuccess = function(e) {
|
||||
debug.info("mkdir complete");
|
||||
if(callback && "function" === typeof callback) {
|
||||
callback.call(undefined, undefined);
|
||||
}
|
||||
};
|
||||
directoryRequest.onerror = onerror;
|
||||
}
|
||||
};
|
||||
getRequest.onerror = onerror;
|
||||
}
|
||||
|
||||
function rmdir(pathname, callback) {
|
||||
|
||||
}
|
||||
|
||||
function stat(transaction, pathname, callback) {
|
||||
|
||||
}
|
||||
|
||||
function link(oldpath, newpath, callback) {
|
||||
|
||||
}
|
||||
|
||||
function unlink(pathname, callback) {
|
||||
|
||||
}
|
||||
|
||||
function api() {
|
||||
return {
|
||||
open: open,
|
||||
close: close,
|
||||
mkdir: mkdir.bind(null, null),
|
||||
rmdir: rmdir,
|
||||
stat: stat.bind(null, null),
|
||||
link: link,
|
||||
unlink: unlink,
|
||||
dump: dump
|
||||
}
|
||||
}
|
||||
|
||||
this.open = open;
|
||||
this.close = close;
|
||||
this.mkdir = mkdir;
|
||||
this.rmdir = rmdir;
|
||||
this.stat = stat;
|
||||
this.link = link;
|
||||
this.unlink = unlink;
|
||||
this.api = api;
|
||||
|
||||
// DEBUG
|
||||
function dump(element) {
|
||||
element.innerHTML = "";
|
||||
var transaction = db.transaction([METADATA_STORE_NAME], IDB_RO);
|
||||
var store = transaction.objectStore(METADATA_STORE_NAME);
|
||||
var cursorRequest = store.openCursor();
|
||||
cursorRequest.onsuccess = function(e) {
|
||||
var cursor = e.target.result;
|
||||
if(cursor) {
|
||||
var getRequest = store.get(cursor.key);
|
||||
getRequest.onsuccess = function(e) {
|
||||
var result = e.target.result;
|
||||
element.innerHTML += JSON.stringify(result) + "<br>";
|
||||
cursor.continue();
|
||||
};
|
||||
}
|
||||
};
|
||||
}
|
||||
this.dump = dump;
|
||||
}
|
||||
|
||||
function mount(name, callback, optFormat) {
|
||||
optFormat = (undefined === optFormat) ? false : optFormat;
|
||||
var onerror = genericIDBErrorHandler("mount", callback);
|
||||
var openRequest = indexedDB.open(name);
|
||||
openRequest.onupgradeneeded = function(e) {
|
||||
var db = e.target.result;
|
||||
if(db.objectStoreNames.contains(METADATA_STORE_NAME)) {
|
||||
db.deleteObjectStore(METADATA_STORE_NAME);
|
||||
}
|
||||
if(db.objectStoreNames.contains(FILE_STORE_NAME)) {
|
||||
db.deleteObjectStore(FILE_STORE_NAME);
|
||||
}
|
||||
var metadata = db.createObjectStore(METADATA_STORE_NAME);
|
||||
metadata.createIndex(PARENT_INDEX, PARENT_INDEX_KEY_PATH, {unique: false});
|
||||
metadata.createIndex(NAME_INDEX, NAME_INDEX_KEY_PATH, {unique: true});
|
||||
var files = db.createObjectStore(FILE_STORE_NAME);
|
||||
|
||||
optFormat = true;
|
||||
};
|
||||
openRequest.onsuccess = function(e) {
|
||||
var db = e.target.result;
|
||||
var fs = new FileSystem(db);
|
||||
|
||||
if(optFormat) {
|
||||
var transaction = db.transaction([METADATA_STORE_NAME], IDB_RW);
|
||||
var store = transaction.objectStore(METADATA_STORE_NAME);
|
||||
debug.info("format required");
|
||||
var clearRequest = store.clear();
|
||||
clearRequest.onsuccess = function() {
|
||||
fs.mkdir(transaction, "/", function(error) {
|
||||
if(error) {
|
||||
onerror(error);
|
||||
} else {
|
||||
debug.info("format complete");
|
||||
if(callback && "function" === typeof callback) {
|
||||
callback.call(undefined, undefined, fs.api());
|
||||
}
|
||||
}
|
||||
});
|
||||
};
|
||||
clearRequest.onerror = onerror;
|
||||
} else {
|
||||
if(callback && "function" === typeof callback) {
|
||||
callback.call(undefined, undefined, fs.api());
|
||||
}
|
||||
}
|
||||
};
|
||||
openRequest.onerror = onerror;
|
||||
}
|
||||
|
||||
function umount(fs, callback) {
|
||||
|
||||
}
|
||||
|
||||
var IDBFS = {
|
||||
mount: mount,
|
||||
umount: undefined
|
||||
};
|
||||
|
||||
return IDBFS;
|
||||
|
||||
});
|
||||
Loading…
Reference in New Issue