78 lines
2.5 KiB
ActionScript
78 lines
2.5 KiB
ActionScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mangui.hls.playlist {
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CONFIG::LOGGING {
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import org.mangui.hls.utils.Log;
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}
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/**
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* Facilitates extracting information from a data URI.
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*/
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public class DataUri {
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private static const DATA_PROTOCOL : String = "data:";
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private static const BASE_64 : String = "base64";
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private var _dataUri : String;
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public function DataUri(dataUri : String) {
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_dataUri = dataUri;
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}
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/**
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* @return Returns the data portion of the data URI if it is able extract the information,
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* null otherwise.
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*/
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public function extractData() : String {
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if (_dataUri == null) {
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return null;
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}
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var base64Index : int = _dataUri.indexOf(BASE_64 + ',');
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var dataIndex : int = _dataUri.indexOf(',') + 1;
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if (dataIndex > _dataUri.length) {
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return null;
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}
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var data : String = _dataUri.substr(dataIndex);
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return (base64Index === -1) ? _extractPlainData(data) : _extractBase64Data(data);
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}
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/**
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* Data URIs support base 64 encoding the data section.
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* This is not typically used for plain text files, which includes HLS manifests.
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* As such, decoded base 64 data sections is not currently (6/18/14) supported.
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* @param data
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* @return
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*/
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private function _extractBase64Data(data : String) : String {
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CONFIG::LOGGING {
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Log.warn("Base 64 encoded Data URIs are not supported.");
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}
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return null;
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}
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/**
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* @param data
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* @return The URL decoded data section from the data URI.
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*/
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private function _extractPlainData(data : String) : String {
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var decodedData : String = decodeURIComponent(data);
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CONFIG::LOGGING {
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Log.debug2("Decoded data from data URI into: " + decodedData);
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}
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return decodedData;
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}
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/**
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* @param dataUri
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* @return True if the provided string is a data URI, false otherwise.
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*/
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public static function isDataUri(dataUri : String) : Boolean {
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return dataUri != null && dataUri.indexOf(DATA_PROTOCOL) === 0;
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}
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}
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}
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