87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Mike Pinkerton (pinkerton@netscape.com)
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*/
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#include "DefProcFakery.h"
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#pragma options align=mac68k
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typedef struct {
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short jmpInstr;
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Ptr jmpAddr;
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Handle mSystemDefProc;
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} JmpRecord, *JmpPtr, **JmpHandle;
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#pragma options align=reset
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Boolean
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DefProcFakery :: CreateDefProc( RoutineDescriptor* inRoutineAddr, Handle inSystemDefProc, Handle* outDefProcHandle )
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{
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*outDefProcHandle = ::NewHandle(sizeof(JmpRecord));
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if ( !*outDefProcHandle )
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return false;
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JmpHandle jh = (JmpHandle) *outDefProcHandle;
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(**jh).jmpInstr = 0x4EF9; // jump instruction
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(**jh).jmpAddr = (Ptr) inRoutineAddr; // where to jump to
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(**jh).mSystemDefProc = inSystemDefProc; // the system defproc, so we can get it later
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::HLockHi((Handle)jh);
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return true;
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}
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//
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// GetSystemDefProc
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//
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// Returns the system defProc stashed in the fake defproc from when it was created
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//
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Handle
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DefProcFakery :: GetSystemDefProc ( Handle inFakedDefProc )
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{
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Handle sysDefProc = NULL;
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JmpHandle jH = (JmpHandle) inFakedDefProc;
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if ( jH )
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sysDefProc = (**jH).mSystemDefProc;
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return sysDefProc;
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} // GetSystemDefProc
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//
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// DestroyDefProc
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//
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// Delete the def proc and the routine descriptor associated with it
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//
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void
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DefProcFakery :: DestroyDefProc ( Handle inFakedDefProc )
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{
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JmpHandle jh = (JmpHandle) inFakedDefProc;
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::DisposeRoutineDescriptor ( (RoutineDescriptor*)((**jh).jmpAddr) );
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::DisposeHandle ( inFakedDefProc );
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} // DestroyDefProc
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