mac_dll.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** 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 
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 * 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. 
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 * This file, and the files included with this file, is distributed and made 
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 * ***** END LICENSE BLOCK ***** */ 

#include <stdio.h>
#include "dllacces.h"
#include "hxassert.h"
#include "hlxosstr.h"
#include "platform/mac/maclibrary.h"

static const char ErrLoadFailed[] = "Unable to load library";
static const char ErrSymbolNotFound[] = "Symbol not found";

class MacDLLAccess : public DLLAccessImp
{
public:
    MacDLLAccess();
    virtual ~MacDLLAccess();
    virtual int Open(const char* dllName);
    virtual int Close() ;
    virtual void* GetSymbol(const char* symbolName);
    virtual const char* GetErrorStr() const;
    virtual char* CreateVersionStr(const char* dllName) const;
    virtual void CreateName(const char* short_name, const char* long_name, 
		      char* out_buf, UINT32& out_buf_len, 
		      UINT32 nMajor, UINT32 nMinor);

private:
    void* m_handle;
    const char* m_pErrorStr;
};

MacDLLAccess::MacDLLAccess() : 
    m_handle(0)
{}

MacDLLAccess::~MacDLLAccess()
{
    if (m_handle)
    {
	Close();
    }
}

int MacDLLAccess::Open(const char* dllName)
{
    int ret = DLLAccess::NO_LOAD;

    if (m_handle)
    {
	Close();
    }
    
    m_handle = LoadLibrary(OS_STRING((const char*) dllName));

    if (m_handle)
    {
	ret = DLLAccess::DLL_OK;
    }
    else
    {
	m_pErrorStr = ErrLoadFailed;
    }

    return ret;
}

int MacDLLAccess::Close()
{

#if defined(_DEBUG)
    // if debug build, don't free library if "HXMemoryLeak" is enabled.
    // set  \\HKEY_CLASSES_ROOT\HXMemoryLeak  to "1" for mem leak debugging
    if (::HXDebugOptionEnabled("HXMemoryLeak")==FALSE)
	FreeLibrary(m_handle);
#else
    FreeLibrary(m_handle);
#endif
    
    m_handle = 0;

    return DLLAccess::DLL_OK;
}

void* MacDLLAccess::GetSymbol(const char* symbolName)
{
    void* ret = GetProcAddress(m_handle, OS_STRING(symbolName));

    if (!ret)
    {
	m_pErrorStr = ErrSymbolNotFound;
    }

    return ret;
}

const char* MacDLLAccess::GetErrorStr() const
{
    return m_pErrorStr;
}

char* MacDLLAccess::CreateVersionStr(const char* dllName) const
{
    return 0;
}

void
MacDLLAccess::CreateName
                    (const char* short_name, const char* long_name, 
		      char* out_buf, UINT32& out_buf_len, 
		      UINT32 nMajor, UINT32 nMinor)
{
    UINT32  long_name_len = strlen(long_name);

    out_buf[0] = 0;
    
    if (long_name_len + DLLAccess::EXTRA_BUF_LEN > out_buf_len)
    {
	HX_ASSERT(0);
	out_buf_len = 0;
	return;
    }
    
#if defined(_CARBON) || defined(_MAC_UNIX)
#ifdef _MAC_MACHO
    out_buf_len = sprintf(out_buf, "%s.bundle", long_name); /* Flawfinder: ignore */
#else
    out_buf_len = sprintf(out_buf, "%s.shlb", long_name); /* Flawfinder: ignore */
#endif
#else
    out_buf_len = sprintf(out_buf, "%s.dll", long_name); /* Flawfinder: ignore */
#endif
}

DLLAccessImp* DLLAccess::CreatePlatformDLLImp()
{
    return new MacDLLAccess();
}