gecko-dev/xpcom/io/nsIObjectInputStream.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#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 uint32_t aLength, in uint32_t aAlignMask);
    [notxpcom] void    putBuffer(in charPtr aBuffer, in uint32_t 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 = nullptr;
    }
    return rv;
}

%}