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2026-06-25 21:30:32 +00:00
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+/**
+ * @license
+ * Copyright The Closure Library Authors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Wrappers for the HTML5 File API. These wrappers closely mirror
+ * the underlying APIs, but use Closure-style events and Deferred return values.
+ * Their existence also makes it possible to mock the FileSystem API for testing
+ * in browsers that don't support it natively.
+ *
+ * When adding public functions to anything under this namespace, be sure to add
+ * its mock counterpart to goog.testing.fs.
+ */
+
+goog.provide('goog.fs.blob');
+
+
+
+/**
+ * Concatenates one or more values together and converts them to a Blob.
+ *
+ * @param {...(string|!Blob|!ArrayBuffer)} var_args The values that will make up
+ *     the resulting blob.
+ * @return {!Blob} The blob.
+ */
+goog.fs.blob.getBlob = function(var_args) {
+  'use strict';
+  const BlobBuilder = goog.global.BlobBuilder || goog.global.WebKitBlobBuilder;
+
+  if (BlobBuilder !== undefined) {
+    const bb = new BlobBuilder();
+    for (let i = 0; i < arguments.length; i++) {
+      bb.append(arguments[i]);
+    }
+    return bb.getBlob();
+  } else {
+    return goog.fs.blob.getBlobWithProperties(
+        Array.prototype.slice.call(arguments));
+  }
+};
+
+
+/**
+ * Creates a blob with the given properties.
+ * See https://developer.mozilla.org/en-US/docs/Web/API/Blob for more details.
+ *
+ * @param {!Array<string|!Blob|!ArrayBuffer>} parts The values that will make up
+ *     the resulting blob (subset supported by both BlobBuilder.append() and
+ *     Blob constructor).
+ * @param {string=} opt_type The MIME type of the Blob.
+ * @param {string=} opt_endings Specifies how strings containing newlines are to
+ *     be written out.
+ * @return {!Blob} The blob.
+ */
+goog.fs.blob.getBlobWithProperties = function(parts, opt_type, opt_endings) {
+  'use strict';
+  const BlobBuilder = goog.global.BlobBuilder || goog.global.WebKitBlobBuilder;
+
+  if (BlobBuilder !== undefined) {
+    const bb = new BlobBuilder();
+    for (let i = 0; i < parts.length; i++) {
+      bb.append(parts[i], opt_endings);
+    }
+    return bb.getBlob(opt_type);
+  } else if (goog.global.Blob !== undefined) {
+    const properties = {};
+    if (opt_type) {
+      properties['type'] = opt_type;
+    }
+    if (opt_endings) {
+      properties['endings'] = opt_endings;
+    }
+    return new Blob(parts, properties);
+  } else {
+    throw new Error('This browser doesn\'t seem to support creating Blobs');
+  }
+};