gecko-dev/xpcom/io/nsIObjectInputStream.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *  
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *  
 * The Original Code is Mozilla FastLoad code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 2001 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 *   Brendan Eich <brendan@mozilla.org> (original author)
 */

#include "nsIBinaryInputStream.idl"
#include "nsrootidl.idl"

/**
 * @See nsIObjectOutputStream
 * @See nsIBinaryInputStream
 */

[nsid] native nsID(nsID);

[scriptable, uuid(6c248606-4eae-46fa-9df0-ba58502368eb)]
interface nsIObjectInputStream : nsIBinaryInputStream
{
    /**
     * Read an object from this stream to satisfy a strong or weak reference
     * to one of its interfaces.  If the interface was not along the primary
     * inheritance chain ending in the "root" or XPCOM-identity nsISupports,
     * readObject will QueryInterface from the deserialized object root to the
     * correct interface, which was specified when the object was serialized.
     *
     * @See nsIObjectOutputStream
     */
    nsISupports readObject(in PRBool aIsStrongRef);

    [notxpcom] nsresult readID(out nsID aID);

    /**
     * Optimized deserialization support -- see nsIStreamBufferAccess.idl.
     */
    [notxpcom] charPtr getBuffer(in PRUint32 aLength, in PRUint32 aAlignMask);
    [notxpcom] void    putBuffer(in charPtr aBuffer, in PRUint32 aLength);
};

%{C++

inline nsresult
NS_ReadOptionalObject(nsIObjectInputStream* aStream, PRBool aIsStrongRef,
                      nsISupports* *aResult)
{
    PRBool nonnull;
    nsresult rv = aStream->ReadBoolean(&nonnull);
    if (NS_SUCCEEDED(rv)) {
        if (nonnull)
            rv = aStream->ReadObject(aIsStrongRef, aResult);
        else
            *aResult = nsnull;
    }
    return rv;
}

%}