unix_library.cpp
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- /* ***** BEGIN LICENSE BLOCK *****
- * Source last modified: $Id: unix_library.cpp,v 1.1.1.1.50.3 2004/07/09 01:47:39 hubbe Exp $
- *
- * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file,
- * are subject to the current version of the RealNetworks Public
- * Source License (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the current version of the RealNetworks Community
- * Source License (the "RCSL") available at
- * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
- * will apply. You may also obtain the license terms directly from
- * RealNetworks. You may not use this file except in compliance with
- * the RPSL or, if you have a valid RCSL with RealNetworks applicable
- * to this file, the RCSL. Please see the applicable RPSL or RCSL for
- * the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL") in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your version of
- * this file only under the terms of the GPL, and not to allow others
- * to use your version of this file under the terms of either the RPSL
- * or RCSL, indicate your decision by deleting the provisions above
- * and replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient may
- * use your version of this file under the terms of any one of the
- * RPSL, the RCSL or the GPL.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the
- * portions it created.
- *
- * This file, and the files included with this file, is distributed
- * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
- * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
- * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
- * ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- ////////////////////
- //
- // This file contains functions to load & release Shared Libraries.
- // It is used primarily by the codec loader/unloader code.
- //
- #include "unix_library.h"
- #include "hxtypes.h"
- #include "hxstring.h"
- #include "carray.h"
- #include "dllacces.h"
- //
- // CSharedLibMgr is a class which manages the mapping between the HMODULE
- // and the DLLAccess object which is used to make the actual OS calls to
- // open, close, etc. the library.
- //
- class CSharedLibMgr
- {
- public:
- static ULONG32 LoadLibrary (const char *libname);
- static void FreeLibrary (HMODULE lib);
- static void * GetProcAddress (HMODULE lib, char *funcName);
- private:
- DLLAccess *dll;
- static CHXPtrArray mLibList;
- static DLLAccess * GetLib (ULONG32 index);
- };
- CHXPtrArray CSharedLibMgr::mLibList;
- ULONG32 CSharedLibMgr::LoadLibrary (const char *libName)
- {
- DLLAccess *pAccess = NULL;
- ULONG32 libIndex = DL_BAD_LIB_ID;
- if (libName == NULL)
- return DL_BAD_LIB_ID;
- pAccess = new DLLAccess;
- HX_ASSERT (pAccess);
- if (pAccess->open (libName) == DLLAccess::DLL_OK)
- {
- libIndex = mLibList.Add (pAccess);
- }
- else
- {
- delete pAccess;
- }
- return libIndex;
- }
- void CSharedLibMgr::FreeLibrary (HMODULE libHandle)
- {
- if (libHandle == DL_BAD_LIB_ID)
- return;
- DLLAccess *pAccess = GetLib (libHandle);
- if (pAccess != NULL)
- {
- pAccess->close();
- delete pAccess;
- mLibList.SetAt (libHandle, NULL);
- }
- }
- void *CSharedLibMgr::GetProcAddress (HMODULE libHandle, char *funcName)
- {
- if (libHandle == DL_BAD_LIB_ID || funcName == NULL)
- return NULL;
- DLLAccess *pAccess = GetLib (libHandle);
- HX_ASSERT (pAccess);
- return (pAccess->getSymbol (funcName));
- }
- DLLAccess * CSharedLibMgr::GetLib (ULONG32 index)
- {
- if (index == DL_BAD_LIB_ID)
- return NULL;
- return ((DLLAccess *)mLibList.GetAt (index));
- }
- /////////////////////////////////////////////////////////////////////////////
- //
- // Function:
- //
- // LoadLibrary()
- //
- // Purpose:
- //
- // Called to load a Shared Library given the library's name.
- //
- // Parameters:
- //
- // char* dllname
- // The name of the library.
- //
- // Return:
- //
- // ULONG32
- // Returns a handle to the library.
- //
- ULONG32 LoadLibrary(const char* dllname)
- {
- return CSharedLibMgr::LoadLibrary (dllname);
- }
- /////////////////////////////////////////////////////////////////////////////
- //
- // Function:
- //
- // FreeLibrary()
- //
- // Purpose:
- //
- // Called to free a Shared Library. If this is not called the library
- // will be freed when the application quits.
- //
- // Parameters:
- //
- // HMODULE lib
- //
- // Return:
- //
- // none
- //
- void FreeLibrary(HMODULE lib)
- {
- CSharedLibMgr::FreeLibrary (lib);
- }
- /////////////////////////////////////////////////////////////////////////////
- //
- // Function:
- //
- // GetProcAddress()
- //
- // Purpose:
- //
- // Called to get a function pointer in a Shared Library.
- //
- // Parameters:
- //
- // HMODULE lib
- //
- // char* function
- // The function name
- //
- // Return:
- //
- // void*
- // The address of the function.
- //
- void* GetProcAddress(HMODULE lib, char* function)
- {
- return CSharedLibMgr::GetProcAddress (lib, function);
- }