/*

    File:       main.c

    Version:    1.0

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                expressly stated in this notice, no other rights or licenses, express or implied,

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                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

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    Copyright © 2005 Apple Computer, Inc., All Rights Reserved

 */

//==============================================================================

//

//  DO NO MODIFY THE CONTENT OF THIS FILE

//

//  This file contains the generic CFPlug-in code necessary for your importer

//  To complete your importer implement the function in GetMetadataForFile.c

//

//==============================================================================

#include <CoreFoundation/CoreFoundation.h>

#include <CoreFoundation/CFPlugInCOM.h>

#include <CoreServices/CoreServices.h>

// -----------------------------------------------------------------------------

//  constants

// -----------------------------------------------------------------------------

#define PLUGIN_ID "6379F953-2DC9-4A7F-823B-816DD001A6D6"

//

// Below is the generic glue code for all plug-ins.

//

// You should not have to modify this code aside from changing

// names if you decide to change the names defined in the Info.plist

//

// -----------------------------------------------------------------------------

//  typedefs

// -----------------------------------------------------------------------------

// The import function to be implemented in GetMetadataForFile.c

Boolean GetMetadataForFile(void *thisInterface, 

               CFMutableDictionaryRef attributes, 

               CFStringRef contentTypeUTI,

               CFStringRef pathToFile);

// The layout for an instance of MetaDataImporterPlugIn 

typedef struct __MetadataImporterPluginType

{

    MDImporterInterfaceStruct *conduitInterface;

    CFUUIDRef                 factoryID;

    UInt32                    refCount;

} MetadataImporterPluginType;

// -----------------------------------------------------------------------------

//  prototypes

// -----------------------------------------------------------------------------

//  Forward declaration for the IUnknown implementation.

//

MetadataImporterPluginType  *AllocMetadataImporterPluginType(CFUUIDRef inFactoryID);

void                      DeallocMetadataImporterPluginType(MetadataImporterPluginType *thisInstance);

HRESULT                   MetadataImporterQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv);

void                     *MetadataImporterPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID);

ULONG                     MetadataImporterPluginAddRef(void *thisInstance);

ULONG                     MetadataImporterPluginRelease(void *thisInstance);

// -----------------------------------------------------------------------------

//  testInterfaceFtbl   definition

// -----------------------------------------------------------------------------

//  The TestInterface function table.

//

static MDImporterInterfaceStruct testInterfaceFtbl = {

    NULL,

    MetadataImporterQueryInterface,

    MetadataImporterPluginAddRef,

    MetadataImporterPluginRelease,

    GetMetadataForFile

};

// -----------------------------------------------------------------------------

//  AllocMetadataImporterPluginType

// -----------------------------------------------------------------------------

//  Utility function that allocates a new instance.

//      You can do some initial setup for the importer here if you wish

//      like allocating globals etc...

//

MetadataImporterPluginType *AllocMetadataImporterPluginType(CFUUIDRef inFactoryID)

{

    MetadataImporterPluginType *theNewInstance;

    theNewInstance = (MetadataImporterPluginType *)malloc(sizeof(MetadataImporterPluginType));

    memset(theNewInstance,0,sizeof(MetadataImporterPluginType));

        /* Point to the function table */

    theNewInstance->conduitInterface = &testInterfaceFtbl;

        /*  Retain and keep an open instance refcount for each factory. */

    theNewInstance->factoryID = CFRetain(inFactoryID);

    CFPlugInAddInstanceForFactory(inFactoryID);

        /* This function returns the IUnknown interface so set the refCount to one. */

    theNewInstance->refCount = 1;

    return theNewInstance;

}

// -----------------------------------------------------------------------------

//  Deallocdbg_importerMDImporterPluginType

// -----------------------------------------------------------------------------

//  Utility function that deallocates the instance when

//  the refCount goes to zero.

//      In the current implementation importer interfaces are never deallocated

//      but implement this as this might change in the future

//

void DeallocMetadataImporterPluginType(MetadataImporterPluginType *thisInstance)

{

    CFUUIDRef theFactoryID;

    theFactoryID = thisInstance->factoryID;

    free(thisInstance);

    if (theFactoryID){

        CFPlugInRemoveInstanceForFactory(theFactoryID);

        CFRelease(theFactoryID);

    }

}

// -----------------------------------------------------------------------------

//  MetadataImporterQueryInterface

// -----------------------------------------------------------------------------

//  Implementation of the IUnknown QueryInterface function.

//

HRESULT MetadataImporterQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv)

{

    CFUUIDRef interfaceID;

    interfaceID = CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault,iid);

    if (CFEqual(interfaceID,kMDImporterInterfaceID)){

            /* If the Right interface was requested, bump the ref count,

             * set the ppv parameter equal to the instance, and

             * return good status.

             */

        ((MetadataImporterPluginType*)thisInstance)->conduitInterface->AddRef(thisInstance);

        *ppv = thisInstance;

        CFRelease(interfaceID);

        return S_OK;

    }else{

        if (CFEqual(interfaceID,IUnknownUUID)){

                /* If the IUnknown interface was requested, same as above. */

            ((MetadataImporterPluginType*)thisInstance )->conduitInterface->AddRef(thisInstance);

            *ppv = thisInstance;

            CFRelease(interfaceID);

            return S_OK;

        }else{

                /* Requested interface unknown, bail with error. */

            *ppv = NULL;

            CFRelease(interfaceID);

            return E_NOINTERFACE;

        }

    }

}

// -----------------------------------------------------------------------------

//  MetadataImporterPluginAddRef

// -----------------------------------------------------------------------------

//  Implementation of reference counting for this type. Whenever an interface

//  is requested, bump the refCount for the instance. NOTE: returning the

//  refcount is a convention but is not required so don't rely on it.

//

ULONG MetadataImporterPluginAddRef(void *thisInstance)

{

    ((MetadataImporterPluginType *)thisInstance )->refCount += 1;

    return ((MetadataImporterPluginType*) thisInstance)->refCount;

}

// -----------------------------------------------------------------------------

// SampleCMPluginRelease

// -----------------------------------------------------------------------------

//  When an interface is released, decrement the refCount.

//  If the refCount goes to zero, deallocate the instance.

//

ULONG MetadataImporterPluginRelease(void *thisInstance)

{

    ((MetadataImporterPluginType*)thisInstance)->refCount -= 1;

    if (((MetadataImporterPluginType*)thisInstance)->refCount == 0){

        DeallocMetadataImporterPluginType((MetadataImporterPluginType*)thisInstance );

        return 0;

    }else{

        return ((MetadataImporterPluginType*) thisInstance )->refCount;

    }

}

// -----------------------------------------------------------------------------

//  dbg_importerMDImporterPluginFactory

// -----------------------------------------------------------------------------

//  Implementation of the factory function for this type.

//

void *MetadataImporterPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID)

{

    MetadataImporterPluginType *result;

    CFUUIDRef                 uuid;

        /* If correct type is being requested, allocate an

         * instance of TestType and return the IUnknown interface.

         */

    if (CFEqual(typeID,kMDImporterTypeID)){

        uuid = CFUUIDCreateFromString(kCFAllocatorDefault,CFSTR(PLUGIN_ID));

        result = AllocMetadataImporterPluginType(uuid);

        CFRelease(uuid);

        return result;

    }

        /* If the requested type is incorrect, return NULL. */

    return NULL;

}