unix_library.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 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
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (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.
- *
- * 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);
- }