initial commit

2026-06-25 21:30:32 +00:00
commit 328faf6251
220 changed files with 162103 additions and 0 deletions
@@ -0,0 +1,112 @@
+/**
+ * @license
+ * Copyright The Closure Library Authors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Wrapper for URL and its createObjectUrl and revokeObjectUrl
+ * methods that are part of the HTML5 File API.
+ */
+
+goog.provide('goog.fs.url');
+
+
+/**
+ * Creates a blob URL for a blob object.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {!File|!Blob|!MediaSource|!MediaStream} obj The object for which
+ *   to create the URL.
+ * @return {string} The URL for the object.
+ */
+goog.fs.url.createObjectUrl = function(obj) {
+  'use strict';
+  return goog.fs.url.getUrlObject_().createObjectURL(obj);
+};
+
+
+/**
+ * Revokes a URL created by {@link goog.fs.url.createObjectUrl}.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {string} url The URL to revoke.
+ * @return {void}
+ */
+goog.fs.url.revokeObjectUrl = function(url) {
+  'use strict';
+  goog.fs.url.getUrlObject_().revokeObjectURL(url);
+};
+
+
+/**
+ * @record
+ * @private
+ */
+goog.fs.url.UrlObject_ = function() {};
+
+/**
+ * @param {!File|!Blob|!MediaSource|!MediaStream} arg
+ * @return {string}
+ */
+goog.fs.url.UrlObject_.prototype.createObjectURL = function(arg) {};
+
+/**
+ * @param {string} s
+ * @return {void}
+ */
+goog.fs.url.UrlObject_.prototype.revokeObjectURL = function(s) {};
+
+
+/**
+ * Get the object that has the createObjectURL and revokeObjectURL functions for
+ * this browser.
+ *
+ * @return {!goog.fs.url.UrlObject_} The object for this browser.
+ * @private
+ */
+goog.fs.url.getUrlObject_ = function() {
+  'use strict';
+  const urlObject = goog.fs.url.findUrlObject_();
+  if (urlObject != null) {
+    return urlObject;
+  } else {
+    throw new Error('This browser doesn\'t seem to support blob URLs');
+  }
+};
+
+
+/**
+ * Finds the object that has the createObjectURL and revokeObjectURL functions
+ * for this browser.
+ *
+ * @return {?goog.fs.url.UrlObject_} The object for this browser or null if the
+ *     browser does not support Object Urls.
+ * @private
+ */
+goog.fs.url.findUrlObject_ = function() {
+  'use strict';
+  // This is what the spec says to do
+  // http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL
+  if (goog.global.URL !== undefined &&
+      goog.global.URL.createObjectURL !== undefined) {
+    return /** @type {!goog.fs.url.UrlObject_} */ (goog.global.URL);
+    // This is what the spec used to say to do
+  } else if (goog.global.createObjectURL !== undefined) {
+    return /** @type {!goog.fs.url.UrlObject_} */ (goog.global);
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * Checks whether this browser supports Object Urls. If not, calls to
+ * createObjectUrl and revokeObjectUrl will result in an error.
+ *
+ * @return {boolean} True if this browser supports Object Urls.
+ */
+goog.fs.url.browserSupportsObjectUrls = function() {
+  'use strict';
+  return goog.fs.url.findUrlObject_() != null;
+};