gecko-dev/xpcom/io/nsIObjectInputStream.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * 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 the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brendan Eich <brendan@mozilla.org> (original author)
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "nsIBinaryInputStream.idl"
#include "nsrootidl.idl"

/**
 * @see nsIObjectOutputStream
 * @see nsIBinaryInputStream
 */

[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 boolean 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, bool aIsStrongRef,
                      nsISupports* *aResult)
{
    bool nonnull;
    nsresult rv = aStream->ReadBoolean(&nonnull);
    if (NS_SUCCEEDED(rv)) {
        if (nonnull)
            rv = aStream->ReadObject(aIsStrongRef, aResult);
        else
            *aResult = nsnull;
    }
    return rv;
}

%}