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//
// main.c
//
// Copyright 2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFPlugInCOM.h>
#include <CoreServices/CoreServices.h>
#include "PluginID.h"
// -----------------------------------------------------------------------------
// constants
// -----------------------------------------------------------------------------
//
// 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 *instance);
void* MetadataImporterPluginFactory(CFAllocatorRef allocator, CFUUIDRef typeID);
static ULONG MetadataImporterPluginAddRef(void *instance);
static ULONG MetadataImporterPluginRelease(void *instance);
static HRESULT MetadataImporterQueryInterface(void *instance, REFIID iid, LPVOID *ppv);
// -----------------------------------------------------------------------------
// 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
= (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;
}
// -----------------------------------------------------------------------------
// DeallocXcodeProjectSpotlightPluginMDImporterPluginType
// -----------------------------------------------------------------------------
// 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 *instance) {
CFUUIDRef theFactoryID = instance->factoryID;
free(instance);
if (theFactoryID) {
CFPlugInRemoveInstanceForFactory(theFactoryID);
CFRelease(theFactoryID);
}
}
// -----------------------------------------------------------------------------
// MetadataImporterQueryInterface
// -----------------------------------------------------------------------------
// Implementation of the IUnknown QueryInterface function.
//
HRESULT MetadataImporterQueryInterface(void *instance, REFIID iid, LPVOID *ppv) {
CFUUIDRef interfaceID = CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, iid);
MetadataImporterPluginType *plugin = ((MetadataImporterPluginType*)instance);
HRESULT result = E_INVALIDARG;
if (interfaceID) {
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.
plugin->conduitInterface->AddRef(instance);
*ppv = instance;
result = S_OK;
} else {
if (CFEqual(interfaceID, IUnknownUUID)) {
// If the IUnknown interface was requested, same as above.
plugin->conduitInterface->AddRef(instance);
*ppv = instance;
result = S_OK;
} else {
// Requested interface unknown, bail with error.
*ppv = NULL;
result = E_NOINTERFACE;
}
}
CFRelease(interfaceID);
}
return result;
}
// -----------------------------------------------------------------------------
// 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 *instance) {
MetadataImporterPluginType *plugin = ((MetadataImporterPluginType*)instance);
plugin->refCount += 1;
return plugin->refCount;
}
// -----------------------------------------------------------------------------
// SampleCMPluginRelease
// -----------------------------------------------------------------------------
// When an interface is released, decrement the refCount.
// If the refCount goes to zero, deallocate the instance.
//
ULONG MetadataImporterPluginRelease(void *instance) {
ULONG refCount = 0;
MetadataImporterPluginType *plugin = ((MetadataImporterPluginType*)instance);
plugin->refCount -= 1;
if (plugin->refCount == 0) {
DeallocMetadataImporterPluginType(plugin);
refCount = 0;
} else {
refCount = (plugin)->refCount;
}
return refCount;
}
// -----------------------------------------------------------------------------
// XcodeProjectSpotlightPluginMDImporterPluginFactory
// -----------------------------------------------------------------------------
// Implementation of the factory function for this type.
//
void *MetadataImporterPluginFactory(CFAllocatorRef allocator, CFUUIDRef typeID) {
// If correct type is being requested, allocate an
//instance of TestType and return the IUnknown interface.
MetadataImporterPluginType *result = NULL;
if (CFEqual(typeID, kMDImporterTypeID)){
CFUUIDRef uuid = CFUUIDCreateFromString(kCFAllocatorDefault, CFSTR(PLUGIN_ID));
result = AllocMetadataImporterPluginType(uuid);
CFRelease(uuid);
}
// If the requested type is incorrect, return NULL.
return result;
}
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