extfs

chrome/test/data/extensions/api_test/extfs/file_system.js

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// This file implements an in-memory read-only file system through the extfs
+// API.
+
+// The in-memory file system data.
+var theRoot = {
+  self: { isDirectory: true, name: '', size: 0 },
+  children: [
+    { self: { isDirectory: false, name: 'file1', size: 10 } },
+    { self: { isDirectory: true, name: 'dir1', size: 0 },
+      children: [
+        { self: { isDirectory: false, name: 'file2', size: 20 } },
+        { self: { isDirectory: false, name: 'file3', size: 30 } },
+        { self: { isDirectory: true, name: 'dir2', size: 0 },
+          children: [
+            { self: { isDirectory: false, name: 'file4', size: 40 } },
+            { self: { isDirectory: true, name: 'dir3', size: 0 } },
+          ]
+        },
+      ]},
+  ]
+};
+
+// Get an entry at |path| from the in-memory file system.
+function getEntry(path) {
+  console.log('@@@ getEntry: ' + path);
+  // Path should start with '/testfs'.
+  if (path.length < 1 || !path.match(/^\/testfs/))
+    return null;  // Invalid path.
+  // Drop /testfs.
+  path = path.replace(/\/testfs/, '/');
+  // Normalize the path.
+  path = path.replace(/\/+/g, '/');
+  if (path != '/') {
+    path = path.replace(/\/$/, '');
+  }
+
+  // Return the root if that's what requested.
+  if (path == '/') {
+    return theRoot;
+  }
+
+  function getEntryInternal(pathComponents, entry) {
+    if (entry.self.name == pathComponents[0]) {
+      if (pathComponents.length == 1)
+        return entry;
+      if (entry.self.isDirectory && entry.children) {
+        for (var i = 0; i < entry.children.length; i++) {
+          var rest = pathComponents.slice();
+          rest.shift();
+          var found = getEntryInternal(rest, entry.children[i]);
+          if (found)
+            return found;
+        }
+      }
+    }
+    return null;
+  }
+
+  var pathComponents = path.split('/');
+  return getEntryInternal(pathComponents, theRoot);
+}
+
+chrome.extfs.onEntryRequested.addListener(
+  function(path, callback) {
+    console.log('@@@ onEntryRequested: ' + path);
+    var entry = getEntry(path);
+    if (entry)
+      callback("OK", entry.self);
+    else
+      callback("ERROR_NOT_FOUND", null);
+  });
+
+chrome.extfs.onDirectoryEntriesRequested.addListener(
+  function(path, callback) {
+    console.log('@@@ onDirectoryEntriesRequested: ' + path);
+    var entries = [];
+    var parentEntry = getEntry(path);
+    if (!parentEntry) {
+      callback("ERROR_NOT_FOUND", []);
+      return;
+    }
+    if (parentEntry.children) {
+      for (var i = 0; i < parentEntry.children.length; i++) {
+        entries.push(parentEntry.children[i].self);
+      }
+    }
+    callback("OK", entries);
+  });
+
+chrome.extfs.onSnapshotRequested.addListener(
+  function(path, callback) {
+    console.log('@@@ onSnapshotRequested: ' + path);
+    var entry = getEntry(path);
+    if (!entry) {
+      callback("ERROR_NOT_FOUND", null);
+      return;
+    }
+    var content = '';
+    for (var i = 0; i < entry.self.size; i++)
+      content += 'o';
+    var blob = new Blob([content], {type: "text/plain;charset=UTF-8"});
+    callback("OK", blob);
+  });
+
+chrome.extfs.addMountPoint(
+  'testfs',
+  function(result) {
+    console.log("@@@ addMountPoint result: " + result);
+  }
+);