Streams-API-pubready.html
author Takeshi Yoshino <tyoshino@google.com>
Tue, 10 Dec 2013 01:15:50 +0900
changeset 116 d59e463a9181
parent 14 b311630ca063
permissions -rw-r--r--
Add writeAbort
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<body><div class="head">
  <p>
    
      <a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a>
    
  </p>
  <h1 class="title" id="title">Streams API</h1>
  
  <h2 id="w3c-working-draft-11-february-2013"><abbr title="World Wide Web Consortium">W3C</abbr> Working Draft 11 February 2013</h2>
  <dl>
    
      <dt>This version:</dt>
      <dd><a href="http://www.w3.org/TR/2013/WD-streams-api-20130211/">http://www.w3.org/TR/2013/WD-streams-api-20130211/</a></dd>
      <dt>Latest published version:</dt>
      <dd><a href="http://www.w3.org/TR/streams-api/">http://www.w3.org/TR/streams-api/</a></dd>
    
    
      <dt>Latest editor's draft:</dt>
      <dd><a href="https://dvcs.w3.org/hg/streams-api/raw-file/tip/Overview.htm">https://dvcs.w3.org/hg/streams-api/raw-file/tip/Overview.htm</a></dd>
    
    
    
    
    
      <dt>Previous version:</dt>
      <dd><a href=""></a></dd>
    
    
    <dt>Editor:</dt>
    <dd><a href="mailto:feras.moussa@hotmail.com">Feras Moussa</a>, Invited Expert</dd>

    
  </dl>
  
  
  
  
    
      <p class="copyright">
        <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 
        2013
        
        <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> 
        (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
        <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
        <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>), All Rights Reserved.
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      </p>
    
  
  <hr>
</div>

<section id="abstract" class="introductory"><h2>Abstract</h2>
		<!-- TODO: are all of the links and objects in the abstract formatted? -->
		<p>
			This specification provides an API for representing binary data in web applications as a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> object, 
			as well as programmatically building and reading its contents. This includes:
		</p>
		<ul>
			<li>A <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> interface, which represents a sequence of data that can be read over time.</li>
			<li>A <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> interface, which provides methods to read the contents of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> as a 
				<code>Blob</code>, <code>DataURL</code>, <code>ArrayBuffer</code>, or as <code>Text</code>.</li>
			<li>A <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> interface, which allows for creating a new <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> whose contents is read from an internal buffer that was made by appending <code>Text</code>, <code>Blobs</code>, or <code>ArrayBuffers</code>.</li>
			<li>Extensions to <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-xmlhttprequest-interface">XmlHttpRequest</a> [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] to add support for upload and download of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.</li>
			<li>
				Extensions to <a href="http://dev.w3.org/2006/webapi/FileAPI/#FileErrorInterface">FileError</a> and 
				<a href="http://dev.w3.org/2006/webapi/FileAPI/#FileException">FileException</a> to encompass <a href="#streamerror-error">Stream Errors</a>.</li>
			<li>
				Extensions to <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL">createObjectURL</a> and 
				<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-revokeObjectURL">revokeObjectURL</a> to add support for <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.</li>
		</ul>
		<p>
			Additionally, this specification defines objects to be used within threaded web applications for the synchronous reading of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
		</p>
		<p>
			This API is designed to be used in conjunction with other APIs and elements on the web platform, notably: 
			<a href="http://dev.w3.org/2006/webapi/FileAPI">File</a> [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>], 
			<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2">XMLHttpRequest</a> 
			(e.g. with an overloaded <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-send-method"><code>send()</code></a> method 
			and <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-responsetype-attribute"><code>response</code></a> object for <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> objects) [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>], 
			<a href="http://dev.w3.org/html5/postmsg/#dom-window-postmessage"><code>postMessage</code></a>, and 
			Web Workers [<cite><a class="bibref" href="#bib-WEBWORKERS">WEBWORKERS</a></cite>].
		</p>
<!--End section: Abstract-->
</section><section id="sotd" class="introductory"><h2>Status of This Document</h2>
  
    
      
        <p>
          <em>This section describes the status of this document at the time of its publication. Other
          documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision
          of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports
          index</a> at http://www.w3.org/TR/.</em>
        </p>
        
        <p>
          This document was published as a <b>First Public Working Draft</b> by the <a href="http://www.w3.org/2008/webapps/"><abbr title="World Wide Web Consortium">W3C</abbr> Web Applications (WebApps)</a> as a Working Draft.
          
            This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
          
          
          If you wish to make comments regarding this document, please send them to 
          <a href="mailto:public-webapps@w3.org">public-webapps@w3.org</a> 
          (<a href="mailto:public-webapps-request@w3.org?subject=subscribe">subscribe</a>,
          <a href="http://lists.w3.org/Archives/Public/public-webapps/">archives</a>).
          
          
          
          
        All comments are welcome.
        
        
          </p><p>
            Publication as a Working Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> Membership.
            This is a draft document and may be updated, replaced or obsoleted by other documents at 
            any time. It is inappropriate to cite this document as other than work in progress.
          </p>
        
        
        <p>
          
            This document was produced by a group operating under the 
            <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
          
          
          
            
              <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="http://www.w3.org/2004/01/pp-impl/42538/status" rel="disclosure">public list of any patent disclosures</a> 
            
            made in connection with the deliverables of the group; that page also includes instructions for 
            disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains
            <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the
            information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
            6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
          
          
        </p>
        
      
    
  
</section><section id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#stream-interface" class="tocxref"><span class="secno">2. </span>The Stream Interface</a><ul class="toc"><li class="tocline"><a href="#attributes" class="tocxref"><span class="secno">2.1 </span>Attributes</a></li><li class="tocline"><a href="#methods" class="tocxref"><span class="secno">2.2 </span>Methods</a></li></ul></li><li class="tocline"><a href="#streamreader-interface" class="tocxref"><span class="secno">3. </span>The StreamReader Interface</a><ul class="toc"><li class="tocline"><a href="#attributes-1" class="tocxref"><span class="secno">3.1 </span>Attributes</a></li><li class="tocline"><a href="#methods-1" class="tocxref"><span class="secno">3.2 </span>Methods</a></li><li class="tocline"><a href="#constants" class="tocxref"><span class="secno">3.3 </span>Constants</a></li><li class="tocline"><a href="#streamreader-event-handler-types" class="tocxref"><span class="secno">3.4 </span>Event Handler Attributes</a><ul class="toc"><li class="tocline"><a href="#streamreader-event-summary" class="tocxref"><span class="secno">3.4.1 </span>Event Summary</a></li></ul></li></ul></li><li class="tocline"><a href="#streamreadersync-interface" class="tocxref"><span class="secno">4. </span>The StreamReaderSync Interface</a><ul class="toc"><li class="tocline"><a href="#methods-2" class="tocxref"><span class="secno">4.1 </span>Methods</a></li></ul></li><li class="tocline"><a href="#reading-empty-stream" class="tocxref"><span class="secno">5. </span>Determining an empty Stream</a></li><li class="tocline"><a href="#errors-and-exceptions" class="tocxref"><span class="secno">6. </span>Errors and Exceptions</a><ul class="toc"><li class="tocline"><a href="#streamerror-error" class="tocxref"><span class="secno">6.1 </span>StreamError</a></li><li class="tocline"><a href="#streamexception-error" class="tocxref"><span class="secno">6.2 </span>StreamException</a></li></ul></li><li class="tocline"><a href="#streambuilder-interface" class="tocxref"><span class="secno">7. </span>The StreamBuilder Interface</a><ul class="toc"><li class="tocline"><a href="#attributes-2" class="tocxref"><span class="secno">7.1 </span>Attributes</a></li><li class="tocline"><a href="#methods-3" class="tocxref"><span class="secno">7.2 </span>Methods</a></li><li class="tocline"><a href="#reads-on-a-stream-from-streambuilder" class="tocxref"><span class="secno">7.3 </span>Reads on a Stream from StreamBuilder</a></li><li class="tocline"><a href="#streambuilder-event-handler-types" class="tocxref"><span class="secno">7.4 </span>Event Handler Attributes</a><ul class="toc"><li class="tocline"><a href="#streambuilder-event-summary" class="tocxref"><span class="secno">7.4.1 </span>Event Summary</a></li></ul></li></ul></li><li class="tocline"><a href="#error-uris_for_streams" class="tocxref"><span class="secno">8. </span>URIs for Stream</a><ul class="toc"><li class="tocline"><a href="#creating-revoking-streamuri" class="tocxref"><span class="secno">8.1 </span>Creating and Revoking a Stream URI</a><ul class="toc"><li class="tocline"><a href="#methods-4" class="tocxref"><span class="secno">8.1.1 </span>Methods</a></li></ul></li></ul></li><li class="tocline"><a href="#security" class="tocxref"><span class="secno">9. </span>Security Considerations</a></li><li class="tocline"><a href="#XMLHttpRequest" class="tocxref"><span class="secno">10. </span>Extension of XMLHttpRequest</a><ul class="toc"><li class="tocline"><a href="#addition-of-stream-responsetype" class="tocxref"><span class="secno">10.1 </span>Addition of stream responseType</a></li><li class="tocline"><a href="#readystate3-changes" class="tocxref"><span class="secno">10.2 </span>readyState 3 changes</a></li><li class="tocline"><a href="#send0" class="tocxref"><span class="secno">10.3 </span>send()</a></li></ul></li><li class="tocline"><a href="#requirements" class="tocxref"><span class="secno">11. </span>Requirements and Use Cases</a></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">B.1 </span>Normative references</a></li></ul></li></ul></section>

<section id="introduction" class="section informative">
    	<!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
    	
    	<p>
    		Web applications should have the ability to acquire and manipulate data in a wide variety of forms, 
    		including as a sequence of data made available over time. 
    		This specification defines the basic representation for <a href="#idl-def-Stream"><code>Streams</code></a>, 
    		errors raised by <a href="#idl-def-Stream"><code>Streams</code></a>, 
    		and programmatic ways to read and create <a href="#idl-def-Stream"><code>Streams</code></a>. 
    	</p>
    	<p>
			The <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> interface represents binary data which can be obtained over time. A <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> can come from APIs 
			such as <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-xmlhttprequest-interface"><code>XMLHttpRequest</code></a>, or can
			be built using <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a>. 
			The <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> interface represents a way to read data 
			from a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> as a <code>Blob</code>, <code>DataURL</code>, <code>ArrayBuffer</code>, or as <code>Text</code>, 
			and should happen asynchronously on the user agent’s main thread, 
			with an optional synchronous API used within threaded web applications. 
			An asynchronous API for reading <a href="#idl-def-Stream"><code>Streams</code></a> prevents blocking and UI “freezing” on a user agent’s main thread. 
			This specification defines an asynchronous API based on an event model to read and access a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>, 
			which is closely based on the FileReader interface defined in the [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]. 
			A <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> object provides asynchronous read methods to access the <a href="#idl-def-Stream"><code>Stream's</code></a> data as a 
			<code>Blob</code>, <code>DataURL</code>, <code>ArrayBuffer</code>, or as <code>Text</code> through event handler attributes and the firing of events. 
			The use of events and event handlers allows separate code blocks the ability to monitor the progress of the read 
			(which is particularly useful for long <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> reads or high latency network requests) 
			and error conditions that may arise during reading of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. An example will be illustrative.
		</p>
    	<p>
    		In the example below, different code blocks handle progress, error, and success conditions. 
    		The example demonstrates how to read a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> using <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a>.
    	</p>
    	<div class="example"><div class="example-title"><span>Example 1</span></div><pre class="example">function startRead(stream) {
        
  var reader = new StreamReader();
  
  // Handle progress, success, and errors
  reader.onprogress = updateProgress;
  reader.onload = loaded;
  reader.onerror = errorHandler;
  
    // Read the first 1024 bytes of the stream as UTF-8      
  reader.readAsText(stream, "UTF-8", 1024);
}

function updateProgress(evt) {
    var bytesLoaded = (evt.loaded / 1024);
    // Increase bytes loaded counter
}

function loaded(evt) {  
  // Obtain the read stream data    
  var streamRead = evt.target.result;
  
}

function errorHandler(evt) {
  if(evt.target.error.name == "NOT_READABLE_ERR") {
    // The stream could not be read
  }
}</pre></div>
    	
    	<p>
    		In the example below, different code blocks handle progress, error, and success conditions. 
    		The example below demonstrates how to obtain a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> from <code>XMLHttpRequest</code> to begin playing a large video in <code>readystate</code> 3.
    	</p>
    	<div class="example"><div class="example-title"><span>Example 2</span></div><pre class="example">function handler() {
  if(this.readyState == this.LOADING) {
	var theStream = this.response;
	var streamURL = URL.createObjectURL(theStream);
	document.getElementById("myVideoTag").src = streamURL;
  }
}

var client = new XMLHttpRequest();
client.onreadystatechange = handler;
client.setRequestHeader('customHeader', 'value');
client.setRequestHeader('customHeader2', 'value2');
client.open("GET", "myvideo.h264");
client.responseType = "stream";
client.send();</pre></div>
    	
		<p>
			In addition to reading a Stream, this specification introduces a programatic way to build a Stream with the <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> interface.
			The <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> interface represents a way to provide the data to be read from a Stream by appending the data to an internal buffer.
			<a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> supports appending <code>Blob</code>, <code>ArrayBuffer</code>, and <code>Text</code> data to the buffer. 
			<a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> also provides an event to notify when the data available to be read from the buffer has fallen below a given threshold.
		</p>
		<p>
			The example below demonstrates how to use <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> to load a stream into the audio tag, whose data is processed and built dynamically at read time. 
			The <code>thresholdReached</code> event is fired when the buffer falls below 1024 bytes.
		</p>
		
<div class="example"><div class="example-title"><span>Example 3</span></div><pre class="example">function thresholdReached(){
  var moreData = //do work to create more data to place into the stream
  
  //if we have no more data to process and place in the stream, we close
  if(moreData == null){
  	sbuilder.close();
  } else{
  	sbuiler.append(moreData);
  }
}

var sbuilder = new StreamBuilder("audio/mp3", 1024);
var sbuilder.onthresholdreached = thresholdReached;
  
var streamURL = URL.createObjectURL(sbuilder.stream);
document.getElementById('audioTag').src = streamURL;</pre></div>
<!--End section: Introduction-->
</section>

<section class="section" id="stream-interface">
<!--OddPage--><h2><span class="secno">2. </span>The Stream Interface</h2>

	<p>
		This interface represents a raw sequence of linear data which can be read over time. 
		It provides an attribute representing the type of data represented by the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
	</p>
	<p>A <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> is an object that:</p>
	<ul>
		<li>Has a content type;</li>
		<li>Has unspecified length;</li>
		<li>Can generally be used in the same places <code>Blob</code> can be used, such as <code>URL.createObjectURL()</code></li>
	</ul>
	<pre class="idl"><span class="idlInterface" id="idl-def-Stream">interface <span class="idlInterfaceID">Stream</span> {
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-Stream-type">type</a></span>;</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-Stream-close-void">close</a></span> ();</span>
};</span></pre><section id="attributes"><h3><span class="secno">2.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-Stream-type"><code>type</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
			The ASCII-encoded string in lower case representing the media type of the <code>Stream</code>, 
			expressed as an RFC2046 MIME type [<cite><a class="bibref" href="#bib-RFC2046">RFC2046</a></cite>]. 
			Conforming user agents <em class="rfc2119" title="should">should</em> return the MIME type of the <code>Stream</code>, if it is known. 
			If conforming user agents cannot determine the media type of the <code>Stream</code>, they <em class="rfc2119" title="must">must</em> return the empty string. 
			A string is a valid MIME type if it matches the media-type token defined in section 3.7 "Media Types" of RFC 2616 [<cite><a class="bibref" href="#bib-HTTP11">HTTP11</a></cite>].
		</dd></dl></section><section id="methods"><h3><span class="secno">2.2 </span>Methods</h3><dl class="methods"><dt id="widl-Stream-close-void"><code>close</code></dt><dd>
			This method should close the Stream and not allow any future reads. This is done by returning on the next and subsequent reads with no data. This is an irreversible and non-idempotent operation; once a <code>Stream</code> has been closed, it cannot be used again; dereferencing a Stream URI bound to a Stream object on which close has been called results in a <a href="http://www.w3.org/TR/FileAPI/#FiveHundredInternalServerError">500 Error</a>.
		<div><em>No parameters.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></section>
</section>
<!-- End section: The Stream Interface -->

<section class="section" id="streamreader-interface">
<!--OddPage--><h2><span class="secno">3. </span>The StreamReader Interface</h2>
	<p>
		This interface provides methods to read the data of a <code>Stream</code> using progress events and event handler attributes. 
		It is desirable to read data from <a href="#idl-def-Stream">Streams</a> asynchronously in the main thread of user agents. 
		This interface provides such an asynchronous API, and is specified to be used with the global object 
		(<a href="http://www.w3.org/TR/2011/WD-html5-20110525/browsers.html#the-window-object">Window</a> [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>]).
		The <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> is designed in a way to closely follow the <abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://dev.w3.org/2006/webapi/FileAPI/#FileReader-interface">FileReader</a> [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>], 
		and thus only identifies changes or additions to the way <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-filereader">FileReader methods</a> behave.
	</p>
	<p>
		When the <code>StreamReader()</code> constructor is invoked, the user agent <em class="rfc2119" title="must">must</em> return a new <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> object.
	</p>
	<p>
		In environments where the global object is represented by a <code>Window</code> or a <code>WorkerGlobalScope</code> object, 
		the <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> constructor <em class="rfc2119" title="must">must</em> be available.
	</p>
	<p>
		For event handler attributes, event handlers for <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> should mimic
		<a href="http://dev.w3.org/2006/webapi/FileAPI/#event-handler-attributes-section">6.4.3 Event Handler Attributes</a> of the File API specification. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
	</p>
	<p>
		For states, event handlers for <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#blobreader-state">6.4.4 FileReader States</a> 
		of the File API specification, except as defined below for <a href="#widl-StreamReader-DONE"><code>DONE</code></a> (numeric value of 2). [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
	</p>
	<p>
		Multiple reads on <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> should mimic 
		<a href="http://dev.w3.org/2006/webapi/FileAPI/#MultipleReads">6.4.5.1 Multiple Reads</a> of the File API specification. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
	</p>

	
	<pre class="idl"><span class="idlInterface" id="idl-def-StreamReader">interface <span class="idlInterfaceID">StreamReader</span> : <span class="idlSuperclass"><a>EventTarget</a></span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamReader-readAsBlob-void-Stream-stream-unsigned-long-long-maxSize">readAsBlob</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam"><span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamReader-readAsArrayBuffer-void-Stream-stream-unsigned-long-long-maxSize">readAsArrayBuffer</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamReader-readAsText-void-Stream-stream-DOMString-encoding-unsigned-long-long-maxSize">readAsText</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">encoding</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamReader-readAsDataURL-void-Stream-Stream-unsigned-long-long-maxSize">readAsDataURL</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">Stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamReader-abort-void">abort</a></span> ();</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#EMPTY">EMPTY</a></span> = <span class="idlConstValue">0</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#LOADING">LOADING</a></span> = <span class="idlConstValue">1</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#DONE">DONE</a></span> = <span class="idlConstValue">2</span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned short</a></span> <span class="idlAttrName"><a href="#widl-StreamReader-readyState">readyState</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>            <span class="idlAttrName"><a href="#widl-StreamReader-result">result</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>StreamError</a></span>    <span class="idlAttrName"><a href="#widl-StreamReader-error">error</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onloadstart">onloadstart</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onprogress">onprogress</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onload">onload</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onabort">onabort</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onerror">onerror</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-StreamReader-onloadend">onloadend</a></span>;</span>
};</span></pre><section id="attributes-1"><h3><span class="secno">3.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-StreamReader-error"><code>error</code> of type <span class="idlAttrType"><a>StreamError</a></span>, readonly</dt><dd></dd><dt id="widl-StreamReader-onabort"><code>onabort</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onabort"><code>FileReader.onabort</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-onerror"><code>onerror</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onerror"><code>FileReader.onerror</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-onload"><code>onload</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onload"><code>FileReader.onload</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-onloadend"><code>onloadend</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onloadend"><code>FileReader.onloadend</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-onloadstart"><code>onloadstart</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onloadstart"><code>FileReader.onloadstart</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-onprogress"><code>onprogress</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			This event handler should mimic the 
        	<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-onprogress"><code>FileReader.onprogress</code></a> 
        	event handler.
		</dd><dt id="widl-StreamReader-readyState"><code>readyState</code> of type <span class="idlAttrType"><a>unsigned short</a></span>, readonly</dt><dd></dd><dt id="widl-StreamReader-result"><code>result</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>
        	This attribute should mimic the <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-result">FileReader.result</a> attribute, with the following addition:
        		<ul>
        			<li>
        				On getting, if the 
        				<a href="#widl-StreamReader-readAsBlob-void-Stream-stream-int-maxSize">readAsBlob</a> read method is used, 
        				this attribute <em class="rfc2119" title="must">must</em> return a <code>Blob</code> of the data read from the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> 
        				with the type property set as the type of the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. 
        			</li>
        		</ul>
        </dd></dl></section><section id="methods-1"><h3><span class="secno">3.2 </span>Methods</h3><dl class="methods"><dt id="widl-StreamReader-abort-void"><code>abort</code></dt><dd>This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#abort"><code>FileReader.abort()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]<div><em>No parameters.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamReader-readAsArrayBuffer-void-Stream-stream-unsigned-long-long-maxSize"><code>readAsArrayBuffer</code></dt><dd>
			<p></p>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsArrayBuffer"><code>FileReader.readAsArrayBuffer()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
				The only addition is the addition of a <code>maxSize</code> parameter, which has the following adjustment:
			</p>
				<ul>
					<li>
						If <code>maxSize</code> is less than one, throw an Invalid Argument exception. Terminate these overall steps.
					</li>
					<li>
						When the stream has been fully read, 
						or the number of bytes specified by <code>maxSize</code> has been reached, 
						set <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> to <code>DONE</code>.
					</li>
				</ul>
			<p></p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd></dd>
			</dl>

		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamReader-readAsBlob-void-Stream-stream-unsigned-long-long-maxSize"><code>readAsBlob</code></dt><dd>
			<p></p>
			<p>
				When this method is called, the user agent <em class="rfc2119" title="must">must</em> run the steps below (unless otherwise indicated).
			</p>
			<ol>
				<li>
						If <code>maxSize</code> is less than one, through an Invalid Argument exception. Terminate these overall steps.
					</li>
				<li>
					If <code>readyState</code> is <code>LOADING</code>, raise a <code>NOT_ALLOWED_ERR</code> exception and terminate these steps.
				</li>
				<li>
					If an error occurs during reading the <code>stream</code> parameter, 
					set <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> to <code>DONE</code> and set 
					<a class="idlType" href="#widl-StreamReader-result"><code>result</code></a> to <code>null</code>. 
					Proceed to the error steps below.
						<ol>
							<li>
								Dispatch a progress event called <code>error</code>. 
								Set the <a class="idlType" href="#widl-StreamReader-error"><code>error</code></a> attribute; 
								on getting, the <a class="idlType" href="#widl-StreamReader-error"><code>error</code></a> 
								attribute <em class="rfc2119" title="must">must</em> be a <a href="#streamerror-error"><code>StreamError</code></a> object with a valid error code 
								that indicates the kind of file error that has occurred.
							</li>
							<li>
								Dispatch a progress event called <code>loadend</code>.
							</li>
							<li>
								Terminate this overall set of steps.
							</li>
						</ol>
				</li>
				<li>
					If no error has occurred, set <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> to <code>LOADING</code>.
				</li>
				<li>
					Fire a progress event called <code>loadstart</code>.
				</li>
				<li>
					Make progress notifications.
				</li>
				<li>
					Continue reading on the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>:
						<ol>
							<li>
								If the optional <code>maxSize</code> parameter has been set, 
								set the <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> to <code>DONE</code> 
								when the number of bytes read reaches <code>MAX_SIZE</code> 
								or the stream has been fully read and the number of bytes is less than <code>MAX_SIZE</code>.
							</li>
							<li>
								If the optional parameter has not been set, 
								set <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> 
								to <code>DONE</code> when the stream has been fully read. 
							</li>
						</ol>
				</li>
				<li>
					Set the <a class="idlType" href="#widl-StreamReader-result"><code>result</code></a> attribute to be stream’s data content represented as a <code>Blob</code>; 
					on getting, the result <a class="idlType" href="#widl-StreamReader-result"><code>result</code></a> returns the (complete) data of stream as a <code>Blob</code>.
				</li>
				<li>
					Terminate this overall set of steps.
				</li>
			</ol>
			<p></p>
			
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamReader-readAsDataURL-void-Stream-Stream-unsigned-long-long-maxSize"><code>readAsDataURL</code></dt><dd>
		<p></p>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsDataURL"><code>FileReader.readAsDataURL()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>] 
				The only addition is the addition of a <code>maxSize</code> parameter, which has the following adjustment.
			</p>
				<ul>
					<li>
						If <code>maxSize</code> is less than one, through an Invalid Argument exception. Terminate these overall steps.
					</li>
					<li>
						Queue a task to update the <a class="idlType" href="#widl-StreamReader-result"><code>result</code></a> attribute 
						with the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> as a DataURL [<cite><a class="bibref" href="#bib-RFC2397">RFC2397</a></cite>] after the stream has been fully read, 
						or the number of bytes specified by <code>maxSize</code> has been reached; 
						on getting, the <a class="idlType" href="#widl-StreamReader-result"><code>result</code></a> attribute 
						returns the (complete) data of stream as a DataURL [<cite><a class="bibref" href="#bib-RFC2397">RFC2397</a></cite>].
					</li>
				</ul>

			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd></dd>
			</dl>
			
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">Stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completionk</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamReader-readAsText-void-Stream-stream-DOMString-encoding-unsigned-long-long-maxSize"><code>readAsText</code></dt><dd>	
		<p></p>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsDataText"><code>FileReader.readAsText()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
				The only addition is the addition of a <code>maxSize</code> parameter, which has the following adjustment:
			</p>
			<ol>
				<li>
						If <code>maxSize</code> is less than one, through an Invalid Argument exception. Terminate these overall steps.
					</li>
				<li>
					If no encoding is specified, use the <a href="http://dev.w3.org/2006/webapi/FileAPI/#encoding-determination">encoding determination</a> algorithm specified in the [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]. 
				</li>
				<li>
					If no <code>maxSize</code> is specified, continue reading until the stream has been completed.
				</li>
				<li>
					When the stream has been fully read, or 
					<strong>the number of bytes specified by <code>maxSize</code> has been reached</strong>, 
					set <a class="idlType" href="#widl-StreamReader-readyState"><code>readyState</code></a> to <code>DONE</code>.
				</li>
			</ol>
		<p></p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd></dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">encoding</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The encoding format</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></section><section id="constants"><h3><span class="secno">3.3 </span>Constants</h3><dl class="constants"><dt id="widl-StreamReader-DONE"><code>DONE</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
        	The current read request has been completed, or an error occurred during read, 
        	or the read was aborted using <a href="#widl-StreamReader-abort-void"><code>abort()</code></a>. The <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> is no longer reading a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
        </dd><dt id="widl-StreamReader-EMPTY"><code>EMPTY</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
			This state should mimic the 
			<code>EMPTY</code> state of the 
			<a href="http://dev.w3.org/2006/webapi/FileAPI/#blobreader-state">FileReader States</a>
		</dd><dt id="widl-StreamReader-LOADING"><code>LOADING</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
			This state should mimic the 
			<code>LOADING</code> state of the 
			<a href="http://dev.w3.org/2006/webapi/FileAPI/#blobreader-state">FileReader States</a>
        </dd></dl></section>
 <pre class="idl"><span class="idlImplements"><a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> implements <a>EventTarget</a>;</span></pre><div class="idlImplementsDesc"><p>All instances of the <code><a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a></code> type are defined to also implement the <a>EventTarget</a> interface.</p></div>
	
	<section class="section" id="streamreader-event-handler-types">
	<h3><span class="secno">3.4 </span>Event Handler Attributes</h3>
		<p>
			The following are the event handler attributes (and their corresponding event handler event types) that user agents <em class="rfc2119" title="must">must</em> support on StreamReader as DOM attributes:
		</p>
		<table class="error">
		   <thead>
				<tr>
					<th><a href="#event-handler-attributes" title="event handler attributes">event handler attribute</a></th>
					<th><a href="#event-handler-event-type">event handler event type</a></th>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td><dfn id="dfn-onloadstart"><code>onloadstart</code></dfn></td>
					<td><code><a href="#dfn-loadstart-event">loadstart</a></code></td>
				</tr>
				<tr>
					<td><dfn id="dfn-onprogress"><code>onprogress</code></dfn></td>
					<td><code><a href="#dfn-progress-event">progress</a></code></td>
				</tr>
				<tr>
					<td><dfn id="dfn-onload"><code>onload</code></dfn></td>
					<td><code><a href="#dfn-load-event">load</a></code></td>
				</tr>
				<tr>
					<td><dfn id="dfn-onabort"><code>onabort</code></dfn></td>
					<td><code title="abort-event"><a href="#dfn-abort-event">abort</a></code></td>
				</tr>
				<tr>
					<td><dfn id="dfn-onerror"><code>onerror</code></dfn></td>
					<td><code><a href="#dfn-error-event">error</a></code></td>
				</tr>
				<tr>
					<td><dfn id="dfn-onloadend"><code>onloadend</code></dfn></td>
					<td><code><a href="#dfn-loadend-event">loadend</a></code></td>
				</tr>
			</tbody>
		</table>
		
		<section class="section" id="streamreader-event-summary">
		<h4><span class="secno">3.4.1 </span>Event Summary</h4>
			<p>
				The following are the events that are fired at <code><a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a></code> objects; 
				<a href="http://dev.w3.org/2006/webapi/FileAPI/#fire-a-progress-event">firing events</a> is defined in DOM Level 3 Events [<cite><a class="bibref" href="#bib-DOM-LEVEL-3-EVENTS">DOM-LEVEL-3-EVENTS</a></cite>], 
				and the table below is normative for the events in this specification. 
			</p>
				<table class="error" id="streamreader-event-summary-table">
					<thead>
						<tr>
							<th>Event name</th>
							<th>Interface</th>
							<th>Fired when…</th>
						</tr>
					</thead>
					<tbody>
						<tr>
							<td><dfn id="dfn-loadstart-event"><code>loadstart</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>When the read starts.</td>
						</tr>
						<tr>
							<td><dfn id="dfn-progress-event"><code>progress</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>While reading (and decoding) a <code>stream</code>, and reporting progress.
							</td>
						</tr>
						<tr>
							<td><dfn id="dfn-abort-event" title="abort-event"><code>abort</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>When the read has been aborted. For instance, by invoking the <code><a href="#widl-StreamReader-abort-void">abort()</a></code> method.</td>
						</tr>
						<tr>
							<td><dfn id="dfn-error-event"><code>error</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>When the read has failed (see <a href="http://dev.w3.org/2006/webapi/FileAPI/#file-error-read">errors</a>).</td>
						</tr>
						<tr>
							<td><dfn id="dfn-load-event"><code>load</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>When the read has successfully completed.</td>
						</tr>
						<tr>
							<td><dfn id="dfn-loadend-event"><code>loadend</code></dfn></td>
							<td><code>ProgressEvent</code></td>
							<td>When the request has completed (either in success or failure).</td>
						</tr>
					</tbody>
				</table>
		</section>
	</section>
</section>
<!-- End section: The StreamReader Interface -->

<section class="section" id="streamreadersync-interface">
<!--OddPage--><h2><span class="secno">4. </span>The StreamReaderSync Interface</h2>
	<p>
		This interface provides methods to read the data of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
	</p>
	<p>
		When the <code>StreamReaderSync()</code> constructor is invoked, the user agent <em class="rfc2119" title="must">must</em> return a new <code>StreamReaderSync</code> object.
	</p>
	<p>
		In environments where the global object is represented by a <a href="http://dev.w3.org/html5/workers/#workerglobalscope"><code>WorkerGlobalScope</code></a> object, 
		the <code>StreamReaderSync</code> constructor <em class="rfc2119" title="must">must</em> be available.
	</p>
	<pre class="idl"><span class="idlInterface" id="idl-def-StreamReaderSync">interface <span class="idlInterfaceID">StreamReaderSync</span> {
<span class="idlMethod">    <span class="idlMethType"><a>Blob</a></span>        <span class="idlMethName"><a href="#widl-StreamReaderSync-readAsBlob-Blob-Stream-stream-unsigned-long-long-maxSize">readAsBlob</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>ArrayBuffer</a></span> <span class="idlMethName"><a href="#widl-StreamReaderSync-readAsArrayBuffer-ArrayBuffer-Stream-stream-unsigned-long-long-maxSize">readAsArrayBuffer</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>DOMString</a></span>   <span class="idlMethName"><a href="#widl-StreamReaderSync-readAsText-DOMString-Stream-stream-DOMString-encoding-unsigned-long-long-maxSize">readAsText</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">encoding</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>DOMString</a></span>   <span class="idlMethName"><a href="#widl-StreamReaderSync-readAsDataURL-DOMString-Stream-stream-unsigned-long-long-maxSize">readAsDataURL</a></span> (<span class="idlParam"><span class="idlParamType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span> <span class="idlParamName">stream</span></span>, <span class="idlParam">optional <span class="idlParamType"><a>unsigned long long</a></span> <span class="idlParamName">maxSize</span></span>);</span>
};</span></pre><section id="methods-2"><h3><span class="secno">4.1 </span>Methods</h3><dl class="methods"><dt id="widl-StreamReaderSync-readAsArrayBuffer-ArrayBuffer-Stream-stream-unsigned-long-long-maxSize"><code>readAsArrayBuffer</code></dt><dd>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsArrayBufferSyncSection"><code>FileReader.readAsArrayBuffer()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
				The only addition is the addition of a <code>maxSize</code> parameter that affects the amount of bytes to read from the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
			</p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>ArrayBuffer</a></code></div></dd><dt id="widl-StreamReaderSync-readAsBlob-Blob-Stream-stream-unsigned-long-long-maxSize"><code>readAsBlob</code></dt><dd>
			<p></p>
			<p>
				When this method is called, the following steps <em class="rfc2119" title="must">must</em> be followed:
			</p>
				<ol>
					<li>
						If an error occurs during reading the <code>stream</code> parameter, 
						throw a <code>StreamException</code> with the appropriate error code. 
						Terminate these overall steps.
					</li>
					<li>
						If no error has occurred, read <code>stream</code> until the end is reached, 
						or the number of bytes specified by <code>maxSize</code> have been read. 
						Return the data contents of <code>stream</code> as a blob 
						with the <code>type</code> property set as the type of the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
					</li>
				</ol>
			<p></p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>Blob</a></code></div></dd><dt id="widl-StreamReaderSync-readAsDataURL-DOMString-Stream-stream-unsigned-long-long-maxSize"><code>readAsDataURL</code></dt><dd>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsDataURLSync-section"><code>FileReader.readAsDataURL()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
				The only addition is the addition of a <code>maxSize</code> parameter that affects the amount of the amount of bytes to read from the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
			</p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>DOMString</a></code></div></dd><dt id="widl-StreamReaderSync-readAsText-DOMString-Stream-stream-DOMString-encoding-unsigned-long-long-maxSize"><code>readAsText</code></dt><dd>
			<p>
				This method should mimic <a href="http://dev.w3.org/2006/webapi/FileAPI/#readAsTextSync"><code>FileReader.readAsText()</code></a>. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
				The only addition is the addition of a <code>maxSize</code> parameter that affects the amount of the amount of bytes to read from the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
			</p>
			
			<dl class="exception" title="StreamException">
				<dt></dt>
				<dd></dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">stream</td><td class="prmType"><code><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The Stream to be read</td></tr><tr><td class="prmName">encoding</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The encoding format</td></tr><tr><td class="prmName">maxSize</td><td class="prmType"><code><a>unsigned long long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The maximum number of bytes to be read before completion</td></tr></table><div><em>Return type: </em><code><a>DOMString</a></code></div></dd></dl></section>
</section>

<section class="section" id="reading-empty-stream">
<!--OddPage--><h2><span class="secno">5. </span>Determining an empty Stream</h2>
	<p>
		StreamReader will read a Stream until maxSize has been reached or the Stream has no further data to return. If a Stream has been read until the end, then there is no further data to return. Subsequent read calls will return the following:
	</p>
		<dl class="switch">
								<dt>If read is <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>readAsBlob</code></a></dt>
								<dd>Return an empty <code>Blob</code> with size zero</dd>
								
								<dt>If read is <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>readAsArrayBuffer</code></a></dt>
								<dd>Return an <code>ArrayBuffer</code> with length zero</dd>
								
								<dt>If read is <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>readAsText</code></a></dt>
								<dd>Return an empty string</dd>
								
								<dt>If read is <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>readAsDataURL</code></a></dt>
								<dd>Return an empty string</dd>
								
							</dl>
	
</section>

<section class="section" id="errors-and-exceptions">
<!--OddPage--><h2><span class="secno">6. </span>Errors and Exceptions</h2>
	<section class="section" id="streamerror-error">
	<h3><span class="secno">6.1 </span>StreamError</h3>
		<p>
			This interface should mimic the <a href="http://dev.w3.org/2006/webapi/FileAPI/#FileErrorInterface"><code>FileError</code> Interface</a>, and contain the same error codes.
		</p>
	</section>
	
	<section class="section" id="streamexception-error">
	<h3><span class="secno">6.2 </span>StreamException</h3>
		<p>
			This interface should mimic the <a href="http://dev.w3.org/2006/webapi/FileAPI/#FileException"><code>FileException</code> Interface</a>, , and contain the same error codes.
		</p>
	</section>
</section>

<section class="section" id="streambuilder-interface">
<!--OddPage--><h2><span class="secno">7. </span>The StreamBuilder Interface</h2>
	<p>
		The <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> interface provides a way for developers to create a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> by appending data. During a read on the <code>stream</code> from a <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a>, the data is read 'First in, First out', 
		in the order it was appended. <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> provides methods for appending different data, as well as a <a href="#dfn-thresholdreached-event"><code>thresholdreached</code></a> event to be notified when the amount of data available for read has fallen below a specified threshold.
	</p>
	<p>
		When the <code>StreamBuilder(in contentType)</code> constructor is invoked, the user agent <em class="rfc2119" title="must">must</em> return a new <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> object. 
		If the <code>StreamBuilder(in contentType)</code> constructor is invoked with the optional <code>thresholdLimit</code> overload, 
		then this limit will be used to fire the <a href="#dfn-thresholdreached-event"><code>thresholdreached</code></a> event.
	</p>
	<p>
		In environments where the global object is represented by a <a href="http://dev.w3.org/html5/workers/#workerglobalscope"><code>WorkerGlobalScope</code></a> object, 
		the <code>StreamBuilder()</code> constructor <em class="rfc2119" title="must">must</em> be available.
	</p>
	<pre class="idl"><span class="idlInterface" id="idl-def-StreamBuilder">[<span class="extAttr">Constructor, Constructor(DOMString contentType, optional int thresholdLimit)</span>]
interface <span class="idlInterfaceID">StreamBuilder</span> : <span class="idlSuperclass"><a>EventTarget</a></span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamBuilder-append-void-String-data">append</a></span> (<span class="idlParam"><span class="idlParamType"><a>String</a></span> <span class="idlParamName">data</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamBuilder-append-void-Blob-data">append</a></span> (<span class="idlParam"><span class="idlParamType"><a>Blob</a></span> <span class="idlParamName">data</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamBuilder-append-void-ArrayBuffer-data">append</a></span> (<span class="idlParam"><span class="idlParamType"><a>ArrayBuffer</a></span> <span class="idlParamName">data</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-StreamBuilder-close-void">close</a></span> ();</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span>             <span class="idlAttrName"><a href="#widl-StreamBuilder-stream">stream</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned long long</a></span> <span class="idlAttrName"><a href="#widl-StreamBuilder-availableDataSize">availableDataSize</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>           <span class="idlAttrName"><a href="#widl-StreamBuilder-onthresholdreached">onthresholdreached</a></span>;</span>
};</span></pre><section id="attributes-2"><h3><span class="secno">7.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-StreamBuilder-availableDataSize"><code>availableDataSize</code> of type <span class="idlAttrType"><a>unsigned long long</a></span>, readonly</dt><dd>The number of bytes of data available for read from the <a>stream</a></dd><dt id="widl-StreamBuilder-onthresholdreached"><code>onthresholdreached</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>
			Handler for <a href="#dfn-thresholdreached-event"><code>thresholdreached</code></a> events.
		</dd><dt id="widl-StreamBuilder-stream"><code>stream</code> of type <span class="idlAttrType"><a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></span>, readonly</dt><dd>Returns the underlying <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> represented by the <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a>.</dd></dl></section><section id="methods-3"><h3><span class="secno">7.2 </span>Methods</h3><dl class="methods"><dt id="widl-StreamBuilder-append-void-String-data"><code>append</code></dt><dd>
			<p></p>
			<p>
				Appends the supplied text to the data available for the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>, writing it as UTF-8.
			</p>
			<p></p>
			
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd>Thrown if append is called on a closed StreamBuilder</dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">data</td><td class="prmType"><code><a>String</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The data to append</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamBuilder-append-void-Blob-data"><code>append</code></dt><dd>
			<p></p>
			<p>
				Appends the supplied <code>Blob</code> to the data available for the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
			</p>
			<p></p>
			
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd>Thrown if append is called on a closed StreamBuilder</dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">data</td><td class="prmType"><code><a>Blob</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The data to append</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamBuilder-append-void-ArrayBuffer-data"><code>append</code></dt><dd>
			<p></p>
			<p>
				Appends the supplied <code>ArrayBuffer</code> to the data available for the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
			</p>
			<p></p>
			
			<dl class="exception" title="OperationNotAllowedException">
				<dt></dt>
				<dd>Thrown if append is called on a closed StreamBuilder</dd>
			</dl>
		<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">data</td><td class="prmType"><code><a>ArrayBuffer</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">The data to append</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-StreamBuilder-close-void"><code>close</code></dt><dd>This method should close the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. This is done by returning on the next and subsequent reads with no data.<div><em>No parameters.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></section>
	
	<section class="section" id="reads-on-a-stream-from-streambuilder">
			<h3><span class="secno">7.3 </span>Reads on a Stream from StreamBuilder</h3>
			<p>
				When a read on a stream from <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> is made, the following steps <em class="rfc2119" title="must">must</em> be followed:
			</p>
				<ol>
					<li>
						If there is enough data available to satisfy the amount requested in the read, return the amount specified.	The data should be returned in the order the data was appended.
						<ul>
							<li>
								Update the value of <a href="#widl-StreamBuilder-availableDataSize"><code>availableDataSize</code></a>. 
							</li>
						</ul>
					</li>
					<li>
						If there is not enough data available to satisfy the amount requested in the read:
						<ul>
							<li>
								If the <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> has been closed, return all the data available, 
								and set <a href="#widl-StreamBuilder-availableDataSize"><code>availableDataSize</code></a> to zero.</li>
							<li>
								Else, keep the request pending and do not return until there is enough data available to satisfy the requset. 
								
							</li>
						</ul>
					</li>
					<li>
						If during the read request the value of <a href="#widl-StreamBuilder-availableDataSize"><code>availableDataSize</code></a>
						fell below the <code>thresholdLimit</code> value specified in the constructor, 
						fire an event called <a href="#dfn-thresholdreached-event"><code>thresholdreached</code></a>.
					</li>
				</ol>
		</section>
		
	<section class="section" id="streambuilder-event-handler-types">
	<h3><span class="secno">7.4 </span>Event Handler Attributes</h3>
		<p>
			The following are the event handler attributes (and their corresponding event handler event types) that user agents <em class="rfc2119" title="must">must</em> support on <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> as DOM attributes:
		</p>
		<table class="error">
		   <thead>
				<tr>
					<th><a href="#event-handler-attributes" title="event handler attributes">event handler attribute</a></th>
					<th><a href="#event-handler-event-type">event handler event type</a></th>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td><dfn id="dfn-onthresholdreached"><code>onthresholdreached</code></dfn></td>
					<td><code><a href="#dfn-thresholdreached-event">thresholdreached</a></code></td>
				</tr>
			</tbody>
		</table>
		
		<section class="section" id="streambuilder-event-summary">
		<h4><span class="secno">7.4.1 </span>Event Summary</h4>
			<p>
				The following are the events that are fired at <code><a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a></code> objects; 
				<a href="http://dev.w3.org/2006/webapi/FileAPI/#fire-a-progress-event">firing events</a> is defined in DOM Level 3 Events [<cite><a class="bibref" href="#bib-DOM-LEVEL-3-EVENTS">DOM-LEVEL-3-EVENTS</a></cite>], 
				and the table below is normative for the events in this specification. 
			</p>
				<table class="error" id="streambuilder-event-summary-table">
					<thead>
						<tr>
							<th>Event name</th>
							<th>Interface</th>
							<th>Fired when…</th>
						</tr>
					</thead>
					<tbody>
						<tr>
							<td><dfn id="dfn-thresholdreached-event"><code>thresholdreached</code></dfn></td>
							<td><code>StreamBuilder</code></td>
							<td>The <a href="#widl-StreamBuilder-availableDataSize"><code>availableDataSize</code></a> has fallen below the <code>thresholdLimit</code> value specified in the constructor</td>
						</tr>
					</tbody>
				</table>
		</section>
		
	</section>

		
</section>
<!-- End section: The StreamBuilder Interface -->

	
<section class="section" id="error-uris_for_streams">
<!--OddPage--><h2><span class="secno">8. </span>URIs for Stream</h2>
	<p>
		To reference a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>, <a href="http://dev.w3.org/2006/webapi/FileAPI/#url">the same URI used</a> for <code>Blobs</code> and <code>Files</code> in 
		<a href="http://dev.w3.org/2006/webapi/FileAPI/#url">6.7. A URI for Blob and File reference</a> of 
		the File API spec should be used. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
		The definitions of <strong>Origin</strong>, <strong>Lifetime</strong>, <strong>Referencing</strong>, and <strong>Dereferencing</strong> of a <code>Blob</code> should be applied to a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>.
	</p>
		<section class="section" id="creating-revoking-streamuri">
		<h3><span class="secno">8.1 </span>Creating and Revoking a Stream URI</h3>
			<p>
				A <dfn id="stream-uri">Stream URI</dfn> is a <code>Blob URI</code> that is referencing a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. 
				These URIs are created and revoked using methods exposed on the URL object, 
				as defined in <a href="http://dev.w3.org/2006/webapi/FileAPI/#creating-revoking">6.7.5. Creating and Revoking a Blob URI</a> 
				of the File API spec. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
			</p>
			<p>
				<a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL">URL.createObjectURL</a> 
				and <a href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-revokeObjectURL">URL.revokeObjectURL</a> 
				should both be extended as follows:
			</p>
			<pre class="idl"><span class="idlInterface" id="idl-def-URL">interface <span class="idlInterfaceID">URL</span> {
<span class="idlMethod">    static <span class="idlMethType"><a>DOMString</a></span> <span class="idlMethName"><a href="#widl-URL-createObjectURL-DOMString-any-object">createObjectURL</a></span> (<span class="idlParam"><span class="idlParamType"><a>any</a></span> <span class="idlParamName">object</span></span>);</span>
<span class="idlMethod">    static <span class="idlMethType"><a>void</a></span>      <span class="idlMethName"><a href="#widl-URL-revokeObjectURL-void-DOMString-url">revokeObjectURL</a></span> (<span class="idlParam"><span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">url</span></span>);</span>
};</span></pre><section id="methods-4"><h4><span class="secno">8.1.1 </span>Methods</h4><dl class="methods"><dt id="widl-URL-createObjectURL-DOMString-any-object"><code>createObjectURL</code>, static</dt><dd>
					<p></p>
					<p>The extension onto <code>createObjectURL</code> should have the following steps added.</p>
						<ol>
							<li>
								If this method is called with a <code>Blob</code> or <code>Stream</code> argument 
								that is <strong>not</strong> valid, then the user agent <em class="rfc2119" title="must">must</em> return null.</li>
							<li>
								If this method is called with a valid <code>Blob</code> or <code>Stream</code> argument, 
								user agents <em class="rfc2119" title="must">must</em> return a unique <code>Blob URI</code> that can be used to dereference the <code>blob</code> or <code>stream</code> argument.	
							</li>
						</ol>
				<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">object</td><td class="prmType"><code><a>any</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>Return type: </em><code><a>DOMString</a></code></div></dd><dt id="widl-URL-revokeObjectURL-void-DOMString-url"><code>revokeObjectURL</code>, static</dt><dd>
					<p></p>
					<p>
						The extension onto <code>revokeObjectURL</code> should have the following steps added.
					</p>
					<ol>
						<li>
							If the URL refers to a <code>Blob</code> or <code>Stream</code> that is both 
							valid and in the same origin of the global object’s <code>URL</code> property on which this static method was called, 
							user agents <em class="rfc2119" title="must">must</em> return a 404 response code when the URL is dereferenced.</li>
						<li>
							If the URL refers to a <code>Blob</code> or <code>Stream</code> that is <strong>not</strong> valid 
							or if the value provided for the URL argument is not a <code>Blob URI</code> 
							or if the URL argument refers to a <code>Blob</code> or <code>Stream</code> that is <strong>not</strong> in the same origin 
							as the global object’s <code>URL</code> property, this method call does nothing. 
							User agents <em class="rfc2119" title="may">may</em> display a message on their error console.
						</li>
					</ol>
				<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">url</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></section>
		</section>
</section>

<section class="section" id="security">
<!--OddPage--><h2><span class="secno">9. </span>Security Considerations</h2>
	<p>
		A <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> should have the same security considerations as a <code>Blob</code>. 
		This is outlined in <a href="http://dev.w3.org/2006/webapi/FileAPI/#security-discussion">6.8. Security Considerations</a> 
		of the File API specification. [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>]
		Because a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> uses a <code>Blob URI</code>, cross origin requests on a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> will not be supported.
	</p>
</section>

<section class="section" id="XMLHttpRequest">
<!--OddPage--><h2><span class="secno">10. </span>Extension of XMLHttpRequest</h2>
	<p>
		This specification proposes an extension to <code>XMLHttpRequest</code> [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] to add support for <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. This section is temporary and is meant to provide a recommendation for how <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> should be incorporated into <code>XMLHttpRequest</code>.
		This will extend <code>XMLHttpRequest</code> to allow for receiving and uploading of a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. 
		One such scenario is providing access to data during <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-readystate"><code>readyState</code></a> 3 (loading). 
		The sections below document in detail what extensions must be done to <code>XMLHttpRequest</code> to support <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a>. 
	</p>
	
	<section class="section" title="addition-of-stream" id="addition-of-stream-responsetype">
	<h3><span class="secno">10.1 </span>Addition of stream responseType</h3>
		<p>
			A responseType of ‘<code>stream</code>’ should be introduced to <code>XMLHttpRequest</code>.
		</p>		
		<p>
			<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-responsetype-attribute">Section 4.7.7 the <code>responseType</code> attribute</a> 
			in XMLHttpRequest Level 2 [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] should now read:
		</p>
		<p>
			On setting the <code>responseType</code> attribute these steps must be run:
		</p>
			<ol>
				<li>
					If the state is not <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-opened"><code>OPENED</code></a> or 
					<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-headers_received"><code>HEADERS_RECEIVED</code></a> 
					raise an <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-domexception-invalid_state_err"><code>INVALID_STATE_ERR</code></a> 
					exception and terminate these steps.
				</li>
				<li>
					If the given value is not the empty string, "<code>arraybuffer</code>", "<code>blob</code>", 
					"<code>document</code>", "<code>stream</code>", or "<code>text</code>" terminate these steps.</li>
				<li>Set the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>responseType</code></a> attribute's value to the given value.</li>
			</ol>	
		<p></p>
		
		<p>
			<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-response-attribute">Section 4.7.8 the <code>response</code> attribute</a> 
			in XMLHttpRequest Level 2 [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] should now read:
		</p>
		<p>
			The <code>response</code> attribute must return the result of running these steps:
		</p>	
			<dl class="switch">
				<dt>If <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>responseType</code></a> is the empty string or "text"</dt>
				<dd>
					<ol>
						<li>
							If the state is not 
							<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-loading">LOADING</a>
							or <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-done">DONE</a> 
							return the empty string and terminate these steps.
						</li>
						<li>
							If the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#error-flag">error flag</a> 
							is true return the empty string and terminate these steps.
						</li>
						<li>
							Return the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#text-response-entity-body">text response entity body</a>.
						</li>
					</ol>
				</dd>
				<dt>If <code>responseType</code> is “<code>stream</code>”</dt>
				<dd>
					<ol>
						<li>
							If the state is not 
							<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-loading">LOADING</a>
							or <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-done">DONE</a> 
							return null and terminate these steps.</li>
						<li>
							If the error flag is true return null and terminate these steps.
						</li>
						<li>
							Return the <a href="#stream-response-entity">stream response entity body</a>.
						</li>
					</ol>
				</dd>
				<dt>Otherwise</dt>
				<dd>
					<ol>
						<li>
							If the state is not <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-done">DONE</a> return null and terminate these steps.
						</li>
						<li>
							If the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#error-flag">error flag</a> is true return null and terminate these steps.
						</li>
						<li>
							<dl class="switch">
								<dt>If <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>responseType</code></a> is "<code>arraybuffer</code>"</dt>
								<dd>Return the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#arraybuffer-response-entity-body">arraybuffer response entity body</a>.</dd>
								
								<dt>If <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>responseType</code></a> is "<code>blob</code>"</dt>
								<dd>Return the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#blob-response-entity-body">blob response entity body</a>.</dd>
								
								<dt>If <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-responsetype"><code>responseType</code></a> is "<code>document</code>"</dt>
								<dd>Return the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#document-response-entity-body">document response entity body</a>.</dd>
								
							</dl>
						</li>
					</ol>
				</dd>
			</dl>	
	
	</section>
	
	<section class="section" id="readystate3-changes">
	<h3><span class="secno">10.2 </span>readyState 3 changes</h3>
		<p>
			A <code>stream</code> is binary data obtained sequentially over time. 
			Given this, a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> should be accessible in <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-readystate"><code>readyState</code></a> 3 (LOADING).
		</p>
		<p>
			<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#response-entity-body0">Section 4.7.5 Response Entity Body</a> 
			in XMLHttpRequest Level 2 [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] should have the following additions:
		</p>
		<p>
			The <dfn id="stream-response-entity">stream response entity body</dfn> is a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> representing the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#response-entity-body">response entity body</a>. 
			If the <a href="#stream-response-entity">stream response entity body</a> has no value assigned to it let it be the return value of the following algorithm:
		</p>
			<ol>
				<li>
					If the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#response-entity-body">response entity body</a> is null, 
					return an empty <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> object and terminate these steps.
				</li>
				<li>
					Return a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> object representing the 
					<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#response-entity-body">response entity body</a>.
				</li>
			</ol>
	</section>

	<section class="section" id="send0">
	<h3><span class="secno">10.3 </span>send()</h3>
		<p>
			<a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#the-send-method">Section 4.6.6 The <code>send()</code> method</a> 
			in XMLHttpRequest Level 2 [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST2">XMLHTTPREQUEST2</a></cite>] should have the following additions:
		</p>
		<dl class="switch">
			<dt>If data is a <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a></dt>
			<dd>
				<p>
					If the object's <code>type</code> attribute is not the empty string let <var>mime type</var> be its value.
				</p>
				<p>
					Let the <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#request-entity-body">request entity body</a> be the raw data represented by <var>data</var>.
				</p>
			
			</dd>
		</dl>	
	</section>

</section>

<section class="section" id="requirements">
<!--OddPage--><h2><span class="secno">11. </span>Requirements and Use Cases</h2>
	<p>
		The <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> type allows for completion of several end-to-end experiences. This section covers what the requirements are for this API, and 
		illustrates some use cases.
	</p>
		<ul>
			<li>
				Begin loading a video through <code>XMLHttpRequest</code> in <code>readyState</code> 3
				<p>
					Videos can typically be large files that may take a long time to download, and require authentication or certain headers to access. 
					For certain video formats, an application can begin playing the video once the first chunks of data are available, and would not need to wait for the entire video to download.
				
				</p>
			</li>
			<li>
				Begin processing data with <a href="#idl-def-StreamReader" class="idlType"><code>StreamReader</code></a> as it is being read via <code>XMLHttpRequest</code>
				<p>
					If a file format is understood, then an application can make sense of the data as it being made available. For example, a given 
					file may be very large and the application wants to begin processing the data immediately, rather than having to wait for full download of the file.
				</p>
			</li>
			<li>
				Upload of dynamic runtime data using <a href="#idl-def-StreamBuilder" class="idlType"><code>StreamBuilder</code></a> and <code>XMLHttpRequest</code>
				<p>
					There are situations where an application may have data to upload once the application is processing. This could involve processing
					of data an application wants to upload as it is being created. One such case is the upload of GPS coordinates within an application. The
					coordiantes may constantly change, and the application wants to upload the data as it being collected.
				
				</p>
			</li>
			<li>
				Media streaming scenarios using <a href="#idl-def-Stream" class="idlType"><code>Stream</code></a> and <code>XMLHttpRequest</code>
				<p>
					Media streaming scenarios require the ability to quickly receive data over the network and connect it to a media element. An application can successfully accomplish this by receiving a Stream in <code>readyState</code> 3 and assign it to a media element. This helps avoid the application from having to buffer the data prior to assigning it to a media element.
				</p>
			</li>
		</ul>
</section>

<section class="appendix" id="acknowledgements">
<!--OddPage--><h2><span class="secno">A. </span>Acknowledgements</h2>
<p>
	Thanks to Eliot Graff for editorial assistance. 
	Special thanks to the <abbr title="World Wide Web Consortium">W3C</abbr>.
</p>
</section>




<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">B. </span>References</h2><section id="normative-references"><h3><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-DOM-LEVEL-3-EVENTS">[DOM-LEVEL-3-EVENTS]</dt><dd>Travis Leithead; Jacob Rossi; Doug Schepers; Björn Höhrmann; Philippe Le Hégaret; Tom Pixley. <a href="http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906"><cite>Document Object Model (DOM) Level 3 Events Specification</cite></a>. 06 September 2012. W3C Working Draft. URL: <a href="http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906">http://www.w3.org/TR/2012/WD-DOM-Level-3-Events-20120906</a>
</dd><dt id="bib-FILE-API">[FILE-API]</dt><dd>Arun Ranganathan; Jonas Sicking. <a href="http://www.w3.org/TR/2012/WD-FileAPI-20121025"><cite>File API</cite></a>. 25 October 2012. W3C Working Draft. URL: <a href="http://www.w3.org/TR/2012/WD-FileAPI-20121025">http://www.w3.org/TR/2012/WD-FileAPI-20121025</a>
</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Robin Berjon et al. <a href="http://www.w3.org/TR/html5/"><cite>HTML5</cite></a>. 17 December 2012. W3C Candidate Recommendation. URL: <a href="http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a>
</dd><dt id="bib-HTTP11">[HTTP11]</dt><dd>R. Fielding et al. <a href="http://www.ietf.org/rfc/rfc2616.txt"><cite>Hypertext Transfer Protocol - HTTP/1.1</cite></a>. June 1999. RFC 2616. URL: <a href="http://www.ietf.org/rfc/rfc2616.txt">http://www.ietf.org/rfc/rfc2616.txt</a>
</dd><dt id="bib-RFC2046">[RFC2046]</dt><dd>N. Freed; N. Borenstein. <a href="http://www.ietf.org/rfc/rfc2046.txt"><cite>Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types</cite></a>. November 1996. RFC 2046. URL: <a href="http://www.ietf.org/rfc/rfc2046.txt">http://www.ietf.org/rfc/rfc2046.txt</a>
</dd><dt id="bib-RFC2397">[RFC2397]</dt><dd>L. Masinter. <a href="http://www.ietf.org/rfc/rfc2397.txt"><cite>The "data" URL scheme</cite></a>. August 1998. RFC 2397. URL: <a href="http://www.ietf.org/rfc/rfc2397.txt">http://www.ietf.org/rfc/rfc2397.txt</a>
</dd><dt id="bib-WEBWORKERS">[WEBWORKERS]</dt><dd>Ian Hickson. <a href="http://www.w3.org/TR/2012/CR-workers-20120501"><cite>Web Workers</cite></a>. 01 May 2012. W3C Candidate Recommendation. URL: <a href="http://www.w3.org/TR/2012/CR-workers-20120501">http://www.w3.org/TR/2012/CR-workers-20120501</a>
</dd><dt id="bib-XMLHTTPREQUEST2">[XMLHTTPREQUEST2]</dt><dd>Anne van Kesteren. <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest2-20080930"><cite>XMLHttpRequest Level 2</cite></a>. 30 September 2008. W3C Working Draft. URL: <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest2-20080930">http://www.w3.org/TR/2008/WD-XMLHttpRequest2-20080930</a>
</dd></dl></section></section></body></html>