Andreas Hocevar
136 lines
3.6 KiB
JavaScript
136 lines
3.6 KiB
JavaScript
// Copyright 2011 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Mock blob object.
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*
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*/
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goog.provide('goog.testing.fs.Blob');
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goog.require('goog.crypt.base64');
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/**
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* A mock Blob object. The data is stored as a string.
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*
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* @param {string=} opt_data The string data encapsulated by the blob.
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* @param {string=} opt_type The mime type of the blob.
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* @constructor
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*/
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goog.testing.fs.Blob = function(opt_data, opt_type) {
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/**
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* @see http://www.w3.org/TR/FileAPI/#dfn-type
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* @type {string}
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*/
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this.type = opt_type || '';
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this.setDataInternal(opt_data || '');
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};
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/**
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* The string data encapsulated by the blob.
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* @type {string}
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* @private
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*/
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goog.testing.fs.Blob.prototype.data_;
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/**
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* @see http://www.w3.org/TR/FileAPI/#dfn-size
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* @type {number}
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*/
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goog.testing.fs.Blob.prototype.size;
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/**
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* Creates a blob with bytes of a blob ranging from the optional start
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* parameter up to but not including the optional end parameter, and with a type
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* attribute that is the value of the optional contentType parameter.
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* @see http://www.w3.org/TR/FileAPI/#dfn-slice
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* @param {number=} opt_start The start byte offset.
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* @param {number=} opt_end The end point of a slice.
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* @param {string=} opt_contentType The type of the resulting Blob.
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* @return {!goog.testing.fs.Blob} The result blob of the slice operation.
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*/
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goog.testing.fs.Blob.prototype.slice = function(
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opt_start, opt_end, opt_contentType) {
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var relativeStart;
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if (goog.isNumber(opt_start)) {
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relativeStart = (opt_start < 0) ?
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Math.max(this.data_.length + opt_start, 0) :
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Math.min(opt_start, this.data_.length);
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} else {
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relativeStart = 0;
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}
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var relativeEnd;
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if (goog.isNumber(opt_end)) {
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relativeEnd = (opt_end < 0) ?
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Math.max(this.data_.length + opt_end, 0) :
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Math.min(opt_end, this.data_.length);
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} else {
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relativeEnd = this.data_.length;
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}
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var span = Math.max(relativeEnd - relativeStart, 0);
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return new goog.testing.fs.Blob(
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this.data_.substr(relativeStart, span),
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opt_contentType);
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};
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/**
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* @return {string} The string data encapsulated by the blob.
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* @override
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*/
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goog.testing.fs.Blob.prototype.toString = function() {
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return this.data_;
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};
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/**
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* @return {!ArrayBuffer} The string data encapsulated by the blob as an
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* ArrayBuffer.
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*/
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goog.testing.fs.Blob.prototype.toArrayBuffer = function() {
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var buf = new ArrayBuffer(this.data_.length * 2);
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var arr = new Uint16Array(buf);
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for (var i = 0; i < this.data_.length; i++) {
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arr[i] = this.data_.charCodeAt(i);
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}
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return buf;
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};
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/**
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* @return {string} The string data encapsulated by the blob as a data: URI.
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*/
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goog.testing.fs.Blob.prototype.toDataUrl = function() {
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return 'data:' + this.type + ';base64,' +
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goog.crypt.base64.encodeString(this.data_);
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};
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/**
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* Sets the internal contents of the blob. This should only be called by other
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* functions inside the {@code goog.testing.fs} namespace.
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*
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* @param {string} data The data for this Blob.
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*/
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goog.testing.fs.Blob.prototype.setDataInternal = function(data) {
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this.data_ = data;
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this.size = data.length;
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};
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