/**
* @license
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
goog.provide('shaka.util.Uint8ArrayUtils');
/**
* @namespace shaka.util.Uint8ArrayUtils
* @summary A set of Uint8Array utility functions.
*/
/**
* Convert a Uint8Array to a base64 string. The output will always use the
* alternate encoding/alphabet also known as "base64url".
* @param {!Uint8Array} arr
* @param {boolean=} opt_padding If true, pad the output with equals signs.
* Defaults to true.
* @return {string}
*/
shaka.util.Uint8ArrayUtils.toBase64 = function(arr, opt_padding) {
// btoa expects a "raw string" where each character is interpreted as a byte.
var bytes = String.fromCharCode.apply(null, arr);
var padding = (opt_padding == undefined) ? true : opt_padding;
var base64 = window.btoa(bytes).replace(/\+/g, '-').replace(/\//g, '_');
return padding ? base64 : base64.replace(/=*$/, '');
};
/**
* Convert a base64 string to a Uint8Array. Accepts either the standard
* alphabet or the alternate "base64url" alphabet.
* @param {string} str
* @return {!Uint8Array}
*/
shaka.util.Uint8ArrayUtils.fromBase64 = function(str) {
// atob creates a "raw string" where each character is interpreted as a byte.
var bytes = window.atob(str.replace(/-/g, '+').replace(/_/g, '/'));
var result = new Uint8Array(bytes.length);
for (var i = 0; i < bytes.length; ++i) {
result[i] = bytes.charCodeAt(i);
}
return result;
};
/**
* Convert a hex string to a Uint8Array.
* @param {string} str
* @return {!Uint8Array}
*/
shaka.util.Uint8ArrayUtils.fromHex = function(str) {
var arr = new Uint8Array(str.length / 2);
for (var i = 0; i < str.length; i += 2) {
arr[i / 2] = window.parseInt(str.substr(i, 2), 16);
}
return arr;
};
/**
* Convert a Uint8Array to a hex string.
* @param {!Uint8Array} arr
* @return {string}
*/
shaka.util.Uint8ArrayUtils.toHex = function(arr) {
var hex = '';
for (var i = 0; i < arr.length; ++i) {
var value = arr[i].toString(16);
if (value.length == 1) value = '0' + value;
hex += value;
}
return hex;
};
/**
* Compare two Uint8Arrays for equality.
* @param {Uint8Array} arr1
* @param {Uint8Array} arr2
* @return {boolean}
*/
shaka.util.Uint8ArrayUtils.equal = function(arr1, arr2) {
if (!arr1 && !arr2) return true;
if (!arr1 || !arr2) return false;
if (arr1.length != arr2.length) return false;
for (var i = 0; i < arr1.length; ++i) {
if (arr1[i] != arr2[i]) return false;
}
return true;
};