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