RetroZilla/netwerk/base/public/nsIStreamLoader.idl

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#include "nsISupports.idl"
#include "nsIChannel.idl"

interface nsIRequest;
interface nsIURI;
interface nsILoadGroup;
interface nsIStreamLoader;
interface nsIInterfaceRequestor;

[scriptable, uuid(359F7990-D4E9-11d3-A1A5-0050041CAF44)]
interface nsIStreamLoaderObserver : nsISupports
{
    void onStreamComplete(in nsIStreamLoader loader,
                          in nsISupports ctxt,
                          in nsresult status,
                          in unsigned long resultLength,
                          [const,array,size_is(resultLength)] in octet result);
};

/**
 * Asynchronously loads a channel into a memory buffer.
 *
 * XXX define behaviour for sizes >4 GB
 */
[scriptable, uuid(31d37360-8e5a-11d3-93ad-00104ba0fd40)]
interface nsIStreamLoader : nsISupports
{
    /**
     * Initialize this stream loader, and start loading the data.
     *
     * @param aChannel
     *        A Channel to load data from. This must not be asyncOpen'd yet!
     * @param aObserver
     *        An observer that will be notified when the data is complete.
     * @param aContext
     *        May be null. Will be passed to the observer.
     *
     * @note Failure to open the channel will be indicated by an async callback
     *       to the observer.
     */
    void init(in nsIChannel aChannel,
              in nsIStreamLoaderObserver aObserver,
              in nsISupports aContext);

    /**
     * Gets the number of bytes read so far.
     */
    readonly attribute unsigned long numBytesRead;

    /**
     * Gets the request that loaded this file.
     * null after the request has finished loading.
     */
    readonly attribute nsIRequest request;
};