Security-222.tar.gz

[apple/security.git] / cdsa / cssm / cssmcontext.h

diff --git a/cdsa/cssm/cssmcontext.h b/cdsa/cssm/cssmcontext.h
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-/*
- * Copyright (c) 2000-2001 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.
- */
-
-
-//
-// context - manage CSSM (cryptographic) contexts every which way
-//
-#ifndef _H_CSSMCONTEXT
-#define _H_CSSMCONTEXT
-
-#include "cssmint.h"
-#include "cspattachment.h"
-#include <Security/context.h>
-
-#ifdef _CPP_CSSMCONTEXT
-# pragma export on
-#endif
-
-
-//
-// A HandleContext adds handle semantics to the Context object.
-// Note that not every Context is a HandleContext - the Contexts we hand
-// to our API customers for fondling are not. Also note that a HandleContext
-// not a PODWrapper.
-// HandleContext has an allocation method taking a CssmAllocator. To destroy
-// a HandleObject, call HandleObject::destroy(the-context, the-allocator).
-// You are responsible for picking the same allocator used on construction.
-//
-// THREADS: HandleContexts are assumed to have single-thread use. That means that
-// operations on HandleContexts are NOT interlocked automatically; two users of
-// the same context must do any arbitration themselves. A HandleContext is howerver
-// safely interlocked against other objects, in particular its CSPAttachment.
-// The upshot is that you're safe using a HandleContext unless someone else is trying
-// to use the same context in parallel.
-//
-class HandleContext : public HandleObject, public Context {
-public:
-    HandleContext(CSPAttachment &attach,
-                  CSSM_CONTEXT_TYPE type,
-                  CSSM_ALGORITHMS algorithmId)
-    : Context(type, algorithmId), attachment(attach), extent(0) { }
-    virtual ~HandleContext();
-
-    CSPAttachment &attachment;
-       
-       using Context::find;    // guard against HandleObjec::find
-
-    void mergeAttributes(const CSSM_CONTEXT_ATTRIBUTE *attributes, uint32 count);
-    CSSM_RETURN validateChange(CSSM_CONTEXT_EVENT event);
-
-    void *operator new (size_t size, CssmAllocator &alloc) throw(std::bad_alloc)
-    { return alloc.malloc(size); }
-    void operator delete (void *addr, size_t, CssmAllocator &alloc) throw()
-    { return alloc.free(addr); }
-    static void destroy(HandleContext *context, CssmAllocator &alloc) throw()
-    { context->~HandleContext(); alloc.free(context); }
-
-    class Maker;       // deluxe builder
-
-#if __GNUC__ > 2
-private:
-    void operator delete (void *addr) throw() { assert(0); }
-#endif
-
-protected:
-    // Locking protocol, courtesy of HandleObject.
-    // This locks the underlying attachment.
-    void lock();
-    bool tryLock();
-
-private:
-    void *extent;                      // extra storage extent in use
-};
-
-inline HandleContext &enterContext(CSSM_CC_HANDLE h)
-{
-    return findHandleAndLock<HandleContext>(h, CSSM_ERRCODE_INVALID_CONTEXT_HANDLE);
-}
-
-
-//
-// A Maker is a deluxe wrapper around Builder. It creates whole HandleContext
-// objects in one swell foop, handling object locking, construction, error
-// recovery, and all that jazz. A Maker cannot create plain Context objects.
-//
-class HandleContext::Maker : public Context::Builder {
-public:
-    Maker(CSSM_CSP_HANDLE handle) 
-               : Context::Builder(findHandleAndLock<CSPAttachment>(handle, CSSM_ERRCODE_INVALID_CSP_HANDLE)),
-               attachment(static_cast<CSPAttachment &>(allocator)), // order dependency(!)
-               locker(attachment, true)
-       { attachment.finishEnter(); }
-
-    CSPAttachment &attachment;
-
-    CSSM_CC_HANDLE operator () (CSSM_CONTEXT_TYPE type,
-                                CSSM_ALGORITHMS algorithm);
-                                                               
-private:
-       StLock<CountingMutex, &CountingMutex::enter, &CountingMutex::exit> locker;
-};
-
-#endif //_H_CSSMCONTEXT