CFPlugIn.c

/*
 * Copyright (c) 2015 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

/*      CFPlugIn.c
        Copyright (c) 1999-2014, Apple Inc.  All rights reserved.
        Responsibility: Tony Parker
*/

#include "CFBundle_Internal.h"
#include "CFInternal.h"

CONST_STRING_DECL(kCFPlugInDynamicRegistrationKey, "CFPlugInDynamicRegistration")
CONST_STRING_DECL(kCFPlugInDynamicRegisterFunctionKey, "CFPlugInDynamicRegisterFunction")
CONST_STRING_DECL(kCFPlugInUnloadFunctionKey, "CFPlugInUnloadFunction")
CONST_STRING_DECL(kCFPlugInFactoriesKey, "CFPlugInFactories")
CONST_STRING_DECL(kCFPlugInTypesKey, "CFPlugInTypes")

CF_PRIVATE void __CFPlugInInitialize(void) {
}

/* ===================== Finding factories and creating instances ===================== */
/* For plugIn hosts. */
/* Functions for finding factories to create specific types and actually creating instances of a type. */

CF_EXPORT CFArrayRef CFPlugInFindFactoriesForPlugInType(CFUUIDRef typeID) {
    CFArrayRef array = _CFPFactoryFindCopyForType(typeID);
    CFMutableArrayRef result = NULL;
    
    if (array) {
        SInt32 i, c = CFArrayGetCount(array);
        result = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
        for (i = 0; i < c; i++) {
            CFUUIDRef factoryId = _CFPFactoryCopyFactoryID((_CFPFactoryRef)CFArrayGetValueAtIndex(array, i));
            if (factoryId) {
                CFArrayAppendValue(result, factoryId);
                CFRelease(factoryId);
            }
        }
        CFRelease(array);
    }
    return result;
}

CF_EXPORT CFArrayRef CFPlugInFindFactoriesForPlugInTypeInPlugIn(CFUUIDRef typeID, CFPlugInRef plugIn) {
    CFArrayRef array = _CFPFactoryFindCopyForType(typeID);
    CFMutableArrayRef result = NULL;

    if (array) {
        SInt32 i, c = CFArrayGetCount(array);
        _CFPFactoryRef factory;
        result = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
        for (i = 0; i < c; i++) {
            factory = (_CFPFactoryRef )CFArrayGetValueAtIndex(array, i);
            CFPlugInRef factoryPlugIn = _CFPFactoryCopyPlugIn(factory);
            if (factoryPlugIn == plugIn) {
                CFUUIDRef factoryId = _CFPFactoryCopyFactoryID(factory);
                CFArrayAppendValue(result, factoryId);
                CFRelease(factoryId);
            }
            if (factoryPlugIn) CFRelease(factoryPlugIn);
        }
        CFRelease(array);
    }
    return result;
}

CF_EXPORT void *CFPlugInInstanceCreate(CFAllocatorRef allocator, CFUUIDRef factoryID, CFUUIDRef typeID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);
    void *result = NULL;
    if (!factory) {
        /* MF:!!! No such factory. */
        CFLog(__kCFLogPlugIn, CFSTR("Cannot find factory %@"), factoryID);
    } else {
        if (!_CFPFactorySupportsType(factory, typeID)) {
            /* MF:!!! Factory does not support type. */
            CFLog(__kCFLogPlugIn, CFSTR("Factory %@ does not support type %@"), factoryID, typeID);
        } else {
            result = _CFPFactoryCreateInstance(allocator, factory, typeID);
        }
    }
    return result;
}

/* ===================== Registering factories and types ===================== */
/* For plugIn writers who must dynamically register things. */
/* Functions to register factory functions and to associate factories with types. */

CF_EXPORT Boolean CFPlugInRegisterFactoryFunction(CFUUIDRef factoryID, CFPlugInFactoryFunction func) {
    // Create factories without plugIns from default allocator
    // MF:!!! Should probably check that this worked, and maybe do some pre-checking to see if it already exists
    // _CFPFactoryRef factory =
    (void)_CFPFactoryCreate(kCFAllocatorSystemDefault, factoryID, func);
    return true;
}

CF_EXPORT Boolean CFPlugInRegisterFactoryFunctionByName(CFUUIDRef factoryID, CFPlugInRef plugIn, CFStringRef functionName) {
    // Create factories with plugIns from plugIn's allocator
    // MF:!!! Should probably check that this worked, and maybe do some pre-checking to see if it already exists
    // _CFPFactoryRef factory =
    (void)_CFPFactoryCreateByName(CFGetAllocator(plugIn), factoryID, plugIn, functionName);
    return true;
}

CF_EXPORT Boolean CFPlugInUnregisterFactory(CFUUIDRef factoryID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);
    
    if (!factory) {
        /* MF:!!! Error.  No factory registered for this ID. */
    } else {
        _CFPFactoryDisable(factory);
    }
    return true;
}

CF_EXPORT Boolean CFPlugInRegisterPlugInType(CFUUIDRef factoryID, CFUUIDRef typeID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);

    if (!factory) {
        /* MF:!!! Error.  Factory must be registered (and not disabled) before types can be associated with it. */
    } else {
        _CFPFactoryAddType(factory, typeID);
    }
    return true;
}

CF_EXPORT Boolean CFPlugInUnregisterPlugInType(CFUUIDRef factoryID, CFUUIDRef typeID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);

    if (!factory) {
        /* MF:!!! Error.  Could not find factory. */
    } else {
        _CFPFactoryRemoveType(factory, typeID);
    }
    return true;
}


/* ================= Registering instances ================= */
/* When a new instance of a type is created, the instance is responsible for registering itself with the factory that created it and unregistering when it deallocates. */
/* This means that an instance must keep track of the CFUUIDRef of the factory that created it so it can unregister when it goes away. */

CF_EXPORT void CFPlugInAddInstanceForFactory(CFUUIDRef factoryID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);

    if (!factory) {
        /* MF:!!! Error.  Could not find factory. */
    } else {
        _CFPFactoryAddInstance(factory);
    }
}

CF_EXPORT void CFPlugInRemoveInstanceForFactory(CFUUIDRef factoryID) {
    _CFPFactoryRef factory = _CFPFactoryFind(factoryID, true);

    if (!factory) {
        /* MF:!!! Error.  Could not find factory. */
    } else {
        _CFPFactoryRemoveInstance(factory);
    }
}