/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: cresload.cpp,v 1.3.32.3 2004/07/09 01:47:27 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * the file under the current version of the RealNetworks Community
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 * will apply. You may also obtain the license terms directly from
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 * This file is part of the Helix DNA Technology. RealNetworks is the
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 * ***** END LICENSE BLOCK ***** */

#include "hxmap.h"
#include "platform/mac/cresload.h"


CResourceLoader::CResourceLoader(FSSpec& theFileSpec)
 : m_theResFile(-1)
 , m_ulRefCount(0)
 , m_theFileSpec(theFileSpec)
 , m_theHandleMap(0)
{
    m_theHandleMap = new CHXMapPtrToPtr();
}

CResourceLoader::~CResourceLoader()
{
    zm_theResourceLoader = NULL;

    HX_ASSERT(m_theHandleMap->IsEmpty());
    delete m_theHandleMap;
    m_theHandleMap = 0;
    
    // close the resource file
    ::CloseResFile(m_theResFile);
    m_theResFile = -1;
}

CResourceLoader* 
CResourceLoader::CreateInstance(FSSpec& theFileSpec)
{
    if (NULL == zm_theResourceLoader)
    {
    	zm_theResourceLoader = new CResourceLoader(theFileSpec);
    }

    zm_theResourceLoader->AddRef();
    return zm_theResourceLoader;
}

UINT32 
CResourceLoader::AddRef()
{
    InterlockedIncrement(&m_ulRefCount);
    return m_ulRefCount;
}

UINT32 
CResourceLoader::Release()
{
    if (InterlockedDecrement(&m_ulRefCount) > 0)
    {
    	return m_ulRefCount;
    }

    delete this;
    return 0;
}

Handle 
CResourceLoader::LoadResource(ResType theType, INT16 id)
{
    Handle hRes = 0;

    // save the old file
    INT16 thePrevResFile = ::CurResFile();

    if (m_theResFile == -1)
    {
    	m_theResFile = ::FSpOpenResFile(&m_theFileSpec, fsRdPerm);
    }

    if (m_theResFile != -1)
    {
    	// set our's current
    	::UseResFile(m_theResFile);

    	// load the resource
    	hRes = ::Get1Resource(theType, id);

    	// do the mapping stuff here in case we already have this handle around...
    	if (hRes)
    	{
	    long thisHandleCount = 0;
	    (void)m_theHandleMap->Lookup(hRes, (void*&)thisHandleCount);
	    thisHandleCount++;
	    (void)m_theHandleMap->SetAt(hRes, (void*)thisHandleCount);
    	}
    	
    	// reset old res file
    	::UseResFile(thePrevResFile);
    }
    return hRes;
}

void
CResourceLoader::UnloadResource(Handle hRes)
{
    // see if the handle has more than one mapped to it; we may not need to
    // release the resource.
    HX_ASSERT(hRes != nil);
    if (!hRes) return;
    
    long thisHandleCount = 0;
    (void)m_theHandleMap->Lookup(hRes, (void*&)thisHandleCount);
    HX_ASSERT(thisHandleCount > 0);
    thisHandleCount--;
    
    if (thisHandleCount == 0)
    {
	// unload the resource
	::ReleaseResource(hRes);
	
	(void)m_theHandleMap->RemoveKey(hRes);
    }
    else
    {
	(void)m_theHandleMap->SetAt(hRes, (void*)thisHandleCount);
    }
}

