dllacces.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 ***** */
- #include "hxtypes.h"
- #include "hxassert.h"
- #include "dllpath.h"
- #include "dllacces.h"
- #include "hxstrutl.h"
- #include "system.ver"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- const UINT32 DLLAccess::EXTRA_BUF_LEN = 32;
- #if !defined(HELIX_CONFIG_NOSTATICS)
- BOOL g_bReportHXCreateInstancePointer = FALSE;
- #endif
- DLLAccess::DLLAccess():
- m_dllImp(0),
- m_curError(0),
- m_curErrorString(0),
- m_isOpen(0),
- m_dllName(0),
- m_version(0)
- {
- }
- DLLAccess::DLLAccess(const char* dllName, UINT16 nLibType):
- m_dllImp(0),
- m_curError(0),
- m_curErrorString(0),
- m_isOpen(0),
- m_dllName(0),
- m_version(0)
- {
- open(dllName, nLibType);
- }
- //
- // NOTE:
- // PLEASE PLEASE PLEASE PLEASE PLEASE
- // Check that pointer before deleting it, AND ABSOLUTELY SET THAT PTR TO NULL when
- // you have deleted it! If you don't it is possible for double deletions to happen,
- // which can cause enormous problems.
- //
- // If I find you not doing this I am going to come talk you about why you feel so
- // compelled to cause crashes.
- //
- DLLAccess::~DLLAccess()
- {
- if(m_isOpen) // SEH 3/4/99: Added check to avoid allocating an error string.
- {
- close();
- }
- delete [] m_curErrorString;
- m_curErrorString=NULL;
- delete [] m_dllName;
- m_dllName=NULL;
-
- delete [] m_version;
- m_version=NULL;
- delete m_dllImp;
- m_dllImp = 0;
- }
- int DLLAccess::open(const char* dllName, UINT16 nLibType)
- {
- HX_ASSERT(dllName);
- if(!dllName)
- {
- m_curError = NO_LOAD;
- setErrorString("Invalid DLL name");
- return m_curError;
- }
- if(m_isOpen)
- {
- m_curError = NO_LOAD;
- setErrorString("DLL already open");
- return m_curError;
- }
- delete m_dllImp;
- // Create DLLAccess implementation object
- m_dllImp = CreateDLLImp();
-
- if (m_dllImp)
- {
- CHXString strDllPath;
-
- DLLAccessPath* pDLLAccessPath = m_dllImp->GetDLLAccessPath();
- if ((nLibType != DLLTYPE_NOT_DEFINED) && pDLLAccessPath)
- {
- if(pDLLAccessPath->GetPath(nLibType))
- strDllPath = pDLLAccessPath->GetPath(nLibType);
- }
- strDllPath += dllName;
- m_curError = m_dllImp->Open((const char*)strDllPath);
- if (m_curError == DLL_OK)
- {
- m_isOpen = 1;
- setErrorString("");
- setDLLName(strDllPath);
- delete [] m_version;
- m_version = m_dllImp->CreateVersionStr(strDllPath);
- FPSETDLLACCESSPATH pSetDLLAccessPath =
- (FPSETDLLACCESSPATH)getSymbol("SetDLLAccessPath");
- if(pSetDLLAccessPath && pDLLAccessPath)
- {
- pDLLAccessPath->PassDLLAccessPath(pSetDLLAccessPath);
- }
- // Reset m_curError to DLL_OK since the getSymbol() call
- // could have changed it's value
- m_curError = DLL_OK;
- }
- else
- {
- setErrorString(m_dllImp->GetErrorStr());
- }
- }
- else
- {
- m_curError = NO_LOAD;
- setErrorString("Not enough memory");
- }
- return m_curError;
- }
- int DLLAccess::close()
- {
- if(m_isOpen)
- {
- m_curError = m_dllImp->Close();
- if (m_curError == DLL_OK)
- {
- setErrorString("");
- }
- else
- {
- setErrorString(m_dllImp->GetErrorStr());
- }
- m_isOpen = 0;
- setDLLName("");
- delete m_dllImp;
- m_dllImp = 0;
- }
- else
- {
- m_curError = NO_LOAD;
- setErrorString("DLL not loaded");
- }
- return m_curError;
- }
- void* DLLAccess::getSymbol(const char* symName)
- {
- void* ret = 0;
- if(m_isOpen)
- {
- HX_ASSERT(m_dllImp);
- ret = m_dllImp->GetSymbol(symName);
- if (!ret)
- {
- m_curError = BAD_SYMBOL;
- setErrorString(m_dllImp->GetErrorStr());
- }
- }
- else
- {
- m_curError = BAD_SYMBOL;
- setErrorString("DLL not loaded");
- }
- return ret;
- }
- void DLLAccess::setErrorString(const char* str)
- {
- if (str)
- {
- delete [] m_curErrorString;
- UINT32 bufSize = strlen(str)+1;
- m_curErrorString = new char[bufSize];
-
- HX_ASSERT(m_curErrorString);
- if (m_curErrorString)
- {
- SafeStrCpy(m_curErrorString, str, bufSize);
- }
- }
- }
- void DLLAccess::setDLLName(const char* str)
- {
- if (str)
- {
- delete [] m_dllName;
- UINT32 bufSize = strlen(str)+1;
- m_dllName = new char[bufSize];
-
- HX_ASSERT(m_dllName);
- if (m_dllName)
- {
- SafeStrCpy(m_dllName, str, bufSize);
- }
- }
- }
- void
- DLLAccess::CreateName(const char* short_name, const char* long_name,
- char* out_buf, UINT32& out_buf_len)
- {
- CreateName(short_name, long_name, out_buf, out_buf_len,
- TARVER_MAJOR_VERSION, TARVER_MINOR_VERSION);
- }
- void
- DLLAccess::CreateName(const char* short_name, const char* long_name,
- char* out_buf, UINT32& out_buf_len,
- UINT32 nMajor, UINT32 nMinor)
- {
- DLLAccessImp* pDLLAccessImp = CreateDLLImp();
-
- pDLLAccessImp->CreateName(short_name, long_name, out_buf, out_buf_len, nMajor, nMinor);
-
- HX_DELETE(pDLLAccessImp);
- }
- DLLAccessPath* DLLAccessImp::GetDLLAccessPath()
- {
- // The default behavior is to call the
- // global GetDLLAccessPath() function
- return ::GetDLLAccessPath();
- }
- DLLAccessImp* DLLAccess::CreateDLLImp()
- {
- #if defined(_STATICALLY_LINKED) && defined(HELIX_CONFIG_CONSOLIDATED_CORE)
- return DLLAccess::CreateMetaDLLImp();
- #elif defined(_STATICALLY_LINKED)
- return DLLAccess::CreateStaticDLLImp();
- #else
- return DLLAccess::CreatePlatformDLLImp();
- #endif
- }