mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Joey Parrish
134 lines
3.2 KiB
JavaScript
134 lines
3.2 KiB
JavaScript
/**
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* Copyright 2014 Google Inc.
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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 String utility functions.
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*/
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goog.provide('shaka.util.StringUtils');
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/**
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* @namespace shaka.util.StringUtils
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* @export
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* @summary A set of string utility functions.
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*/
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/**
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* Convert a string to a Uint8Array.
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*
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* @param {string} str The input string.
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* @return {!Uint8Array} The output array.
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* @export
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*/
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shaka.util.StringUtils.toUint8Array = function(str) {
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var result = new Uint8Array(str.length);
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for (var i = 0; i < str.length; i++) {
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result[i] = str.charCodeAt(i);
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}
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return result;
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};
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/**
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* Convert a Uint8Array to a string.
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*
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* @param {Uint8Array} array The input array.
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* @return {string} The output string.
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* @export
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*/
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shaka.util.StringUtils.fromUint8Array = function(array) {
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return String.fromCharCode.apply(null, array);
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};
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/**
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* Convert a raw string to a base-64 string.
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*
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* @param {string} str The raw string.
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* @param {boolean=} opt_padding If true, pad the output with equals signs.
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* Defaults to true.
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* @return {string} The base-64 string.
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* @export
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*/
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shaka.util.StringUtils.toBase64 = function(str, opt_padding) {
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var base64 = window.btoa(str);
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var padding = (opt_padding == undefined) ? true : opt_padding;
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return padding ? base64 : base64.replace(/=*$/, '');
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};
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/**
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* Convert a base-64 string to a raw string.
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*
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* @param {string} str The base-64 string.
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* @return {string} The raw string.
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* @export
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*/
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shaka.util.StringUtils.fromBase64 = function(str) {
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return window.atob(str);
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};
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/**
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* Convert a hex string to a raw string.
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*
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* @param {string} str The hex string.
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* @return {string} The output string.
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* @export
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*/
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shaka.util.StringUtils.fromHex = function(str) {
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var ints = [];
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for (var i = 0; i < str.length; i += 2) {
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ints.push(window.parseInt(str.substr(i, 2), 16));
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}
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return String.fromCharCode.apply(null, ints);
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};
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/**
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* Compare two Uint8Arrays for equality.
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*
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* @param {Uint8Array} array1
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* @param {Uint8Array} array2
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* @return {boolean}
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* @export
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*/
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shaka.util.StringUtils.uint8ArrayEqual = function(array1, array2) {
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if (!array1 && !array2) return true;
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if (!array1 || !array2) return false;
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if (array1.length != array2.length) return false;
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for (var i = 0; i < array1.length; ++i) {
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if (array1[i] != array2[i]) return false;
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}
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return true;
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};
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/**
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* Convert a Uint8Array to a string which can be used as a key in a dictionary.
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* @param {!Uint8Array} array
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* @return {string}
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* @export
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*/
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shaka.util.StringUtils.uint8ArrayKey = function(array) {
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var tmp = [];
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for (var i = 0; i < array.length; ++i) {
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tmp.push(array[i]);
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}
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return tmp.join(',');
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};
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