/* * Copyright (c) 2003 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ // // transwalkers - server side transition data walking support // // These are data walker operators for securely marshaling and unmarshaling // data structures across IPC. They are also in charge of fixing byte order // inconsistencies between server and clients. // #include using LowLevelMemoryUtilities::increment; using LowLevelMemoryUtilities::difference; bool flipClient() { return Server::connection().process.byteFlipped(); } // // CheckingRelocateWalkers // CheckingReconstituteWalker::CheckingReconstituteWalker(void *ptr, void *base, size_t size, bool flip) : mBase(base), mFlip(flip) { if (mFlip) Flippers::flip(mBase); // came in reversed; fix for base use mOffset = difference(ptr, mBase); mLimit = increment(mBase, size); } // // Relocation support // void relocate(Context &context, void *base, Context::Attr *attrs, uint32 attrSize) { flip(context); CheckingReconstituteWalker relocator(attrs, base, attrSize, flipClient()); context.ContextAttributes = attrs; // fix context->attr vector link for (uint32 n = 0; n < context.attributesInUse(); n++) walk(relocator, context[n]); } // // Outbound flipping support // FlipWalker::~FlipWalker() { for (set::const_iterator it = mFlips.begin(); it != mFlips.end(); it++) delete it->impl; } void FlipWalker::doFlips(bool active) { if (active) { secdebug("flipwalkers", "starting outbound flips"); for (set::const_iterator it = mFlips.begin(); it != mFlips.end(); it++) it->impl->flip(); secdebug("flipwalkers", "outbound flips done"); } }