/*

    File:       CFM_MachO_CFM.c

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    Copyright © 1999-2001 Apple Computer, Inc., All Rights Reserved

*/

//  This sample demonstrates how to call a Mach-O routine, and pass in a CFM based function pointer as a callback parameter.

#define TARGET_API_MAC_CARBON 1

#include <Carbon.h>

#include <string.h>

// Typedef for the function pointer.

typedef void (*MainSysBeepFunctionPtr)( short numBeeps );           //  Callback routine

typedef short (*GetFooWithCallBackFunctionPtr)( short numBeeps, MainSysBeepFunctionPtr callBackFunctionPtr ); //    Mach-O function

// Function pointer.

GetFooWithCallBackFunctionPtr   GetFooWithCallBack  = NULL;

MainSysBeepFunctionPtr          SysBeepCallBack     = NULL;

typedef struct          

{

    CFURLRef        bundleURL;

    CFBundleRef     myBundle;

} GlobalsRec;

GlobalsRec  g;                      //  The globals

void    MainSysBeep( short numBeeps );

static  OSStatus    InstallStandardMenuBar(void);

static  pascal  OSStatus MyWindowEventHandler(EventHandlerCallRef myHandler, EventRef event, void* userData);

static  void    HandleWindowUpdate(WindowRef window);

static  pascal  OSErr QuitAppleEventHandler(const AppleEvent *appleEvt, AppleEvent* reply, long refcon);

static  void    DoTheStuff( void );

void    *MachOFunctionPointerForCFMFunctionPointer( void *cfmfp );

#define mFile 129

#define iQuit 1

void main(void)

{

    Rect        bounds = { 100, 100, 300, 500 };

    WindowRef   window;

    OSStatus    err;

    EventHandlerRef ref;

    EventTypeSpec   list[] = { {kEventClassWindow, kEventWindowClose },

                                { kEventClassWindow, kEventWindowDrawContent } };

    InitCursor();

    err = InstallStandardMenuBar();

    err = AEInstallEventHandler(kCoreEventClass, kAEQuitApplication, NewAEEventHandlerUPP(QuitAppleEventHandler), 0, false);

    err = CreateNewWindow(kDocumentWindowClass,

                  kWindowStandardDocumentAttributes | kWindowStandardHandlerAttribute,

                  &bounds, &window);

    InstallWindowEventHandler(window, NewEventHandlerUPP(MyWindowEventHandler), 2, list, 0, &ref);

    DoTheStuff();

    ShowWindow(window);

    RunApplicationEventLoop();

    ExitToShell();

}

static pascal OSStatus

MyWindowEventHandler(EventHandlerCallRef myHandler, EventRef event, void* userData)

{

#pragma unused (myHandler, userData)

    WindowRef           window;

    OSStatus            result = eventNotHandledErr;

    GetEventParameter(event, kEventParamDirectObject, typeWindowRef, NULL, sizeof(window), NULL, &window);

    if (GetEventKind(event) == kEventWindowDrawContent)

    {

        HandleWindowUpdate(window);

        result = noErr;

    }

    else if (GetEventKind(event) == kEventWindowClose)

    {

        DisposeWindow(window);

        QuitApplicationEventLoop();

        result = noErr;

    }

    return result;

}

static void HandleWindowUpdate(WindowRef window)

{

    Rect        bounds;

    //SInt16        textWidth;

    char        text[1024];

    SetPortWindowPort( window );

    EraseRect( GetWindowPortBounds(window, &bounds) );

    TextSize( 12 );    

    SetRect( &bounds, bounds.top+20, bounds.left+20, bounds.bottom, bounds.right );

    TETextBox( text, strlen(text), &bounds, teJustLeft );

    //  Preferably we would use a CFString for the string handling, in this

    //  case in conjunction with TXNDrawUnicodeTextBox. 

    //  SetRect(&bounds, bounds.top,bounds.left,bounds.top + 50,bounds.left+textWidth);

    //  TXNDrawCFStringTextBox(CFSTR("Hello World!"), &bounds, NULL, NULL);

}

static OSStatus InstallStandardMenuBar(void)

{

    Handle      menuBar;

    MenuRef     menu;

    long        response;

    OSStatus    err = noErr;

    menuBar = GetNewMBar(128);

    if (menuBar)

    {

        SetMenuBar(menuBar);

        // check to see if we should modify the File menu's quit item in

        // order to follow the Aqua HI quit guideline

        err = Gestalt(gestaltMenuMgrAttr, &response);

        if ((err == noErr) && (response & gestaltMenuMgrAquaLayoutMask))

        {

            menu = GetMenuHandle(mFile);

            DeleteMenuItem(menu, iQuit);

        }

        DrawMenuBar();

    }

    return err;

}

static pascal OSErr QuitAppleEventHandler(const AppleEvent *appleEvt, AppleEvent* reply, long refcon)

{

#pragma unused (appleEvt, reply, refcon)

    QuitApplicationEventLoop();

    return(noErr);

}

//

//  This function allocates a block of CFM glue code which contains the instructions to call CFM routines

//

UInt32 template[6] = {0x3D800000, 0x618C0000, 0x800C0000, 0x804C0004, 0x7C0903A6, 0x4E800420};

void    *MachOFunctionPointerForCFMFunctionPointer( void *cfmfp )

{

    UInt32  *mfp = (UInt32*) NewPtr( sizeof(template) );        //  Must later dispose of allocated memory

    mfp[0] = template[0] | ((UInt32)cfmfp >> 16);

    mfp[1] = template[1] | ((UInt32)cfmfp & 0xFFFF);

    mfp[2] = template[2];

    mfp[3] = template[3];

    mfp[4] = template[4];

    mfp[5] = template[5];

    MakeDataExecutable( mfp, sizeof(template) );

    return( mfp );

}

static  void    DoTheStuff()

{

    short       err;

    Boolean     didLoad     = false;                        //  Flag that indicates the status returned when attempting to load a bundle's executable code.

    memset( &g, 0, sizeof(GlobalsRec) );                        //  Initialize the globals

    //  Make a CFURLRef from the CFString representation of the bundle's path.

    //  See the Core Foundation URL Services chapter for details.

    g.bundleURL = CFURLCreateWithFileSystemPath( 

                nil,                                        //  workaround for Radar # 2452789

                CFSTR("/Test.bundle"),                      //  hard coded path for sample

                0,

                true );

    if ( g.bundleURL != NULL )

    // Make a bundle instance using the URLRef.

    g.myBundle  = CFBundleCreate(

                NULL /* kCFAllocatorDefault */,             //  workaround for Radar # 2452789

                g.bundleURL );

    if ( g.myBundle != NULL )

    {

        didLoad = CFBundleLoadExecutable( g.myBundle );     //  Try to load the executable from my bundle.

        if ( didLoad == true )                              //  If the code was successfully loaded, look for our function.

        {       

            // Now that the code is loaded, search for the function we want by name.

            GetFooWithCallBack = (void*)CFBundleGetFunctionPointerForName( g.myBundle, CFSTR("GetFooWithCallBack") );

            // If our function was found in the loaded code, call it with a test value.

            if ( GetFooWithCallBack != nil )

            {

                SysBeepCallBack = MachOFunctionPointerForCFMFunctionPointer( MainSysBeep );

                err = GetFooWithCallBack( 3, SysBeepCallBack ); // This Calls our mach-o function

                DisposePtr( (Ptr) SysBeepCallBack );

            }

            CFBundleUnloadExecutable( g.myBundle );         //  Unload the bundle's executable code. 

        }

    }

    else

    {

        (void) Alert( 128, nil );

    }

    // Any CF objects returned from functions with "create" or "copy" in their names must be released by us!

    if ( g.bundleURL != NULL ) CFRelease( g.bundleURL );

    if ( g.myBundle != NULL ) CFRelease( g.myBundle );

}

void    MainSysBeep( short numBeeps )

{

    short   i;

    for ( i=0 ; i<numBeeps ; i++ )

        SysBeep( 5 );

}