MachOWrapper.cp

/* Copyright (c) 2017, Computer History Museum 
All rights reserved. 
Redistribution and use in source and binary forms, with or without modification, are permitted (subject to 
the limitations in the disclaimer below) provided that the following conditions are met: 
 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following 
   disclaimer in the documentation and/or other materials provided with the distribution. 
 * Neither the name of Computer History Museum nor the names of its contributors may be used to endorse or promote products 
   derived from this software without specific prior written permission. 
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE 
COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 
DAMAGE. */

#include "MachOWrapper.h"

#include <Gestalt.h>
#include <Folders.h>

OSStatus LoadFrameworkBundle ( CFStringRef framework, CFBundleRef *bundlePtr ) {
//	This routine finds a the named framework and creates a CFBundle 
//	object for it.  It looks for the framework in the frameworks folder, 
//	as defined by the Folder Manager.  Currently this is 
//	"/System/Library/Frameworks", but we recommend that you avoid hard coded 
//	paths to ensure future compatibility.
//
//	You might think that you could use CFBundleGetBundleWithIdentifier but 
//	that only finds bundles that are already loaded into your context. 
//	That would work in the case of the System framework but it wouldn't 
//	work if you're using some other, less-obvious, framework.
	OSStatus 	err;
	FSRef 		frameworksFolderRef;
	CFURLRef	baseURL;
	CFURLRef	bundleURL;
	
	*bundlePtr	= nil;	
	baseURL		= nil;
	bundleURL	= nil;
	
//	Find the frameworks folder and create a URL for it.
	err = FSFindFolder ( kOnAppropriateDisk, kFrameworksFolderType, true, &frameworksFolderRef );
	if ( err == noErr ) {
		baseURL = CFURLCreateFromFSRef ( kCFAllocatorSystemDefault, &frameworksFolderRef );
		if ( baseURL == nil )
			err = coreFoundationUnknownErr;
		}
	
//	Append the name of the framework to the URL.
	if ( err == noErr ) {
		bundleURL = CFURLCreateCopyAppendingPathComponent ( kCFAllocatorSystemDefault, baseURL, framework, false );
		if ( bundleURL == nil )
			err = coreFoundationUnknownErr;
		}
	
//	Create a bundle based on that URL and load the bundle into memory.
//	We never unload the bundle, which is reasonable in this case because 
//	the sample assumes that you'll be calling functions from this 
//	framework throughout the life of your application.
	if ( err == noErr ) {
		*bundlePtr = CFBundleCreate ( kCFAllocatorSystemDefault, bundleURL );
		if ( *bundlePtr == nil )
			err = coreFoundationUnknownErr;
		}

	if ( err == noErr ) {
	    if ( !CFBundleLoadExecutable ( *bundlePtr ))
			err = coreFoundationUnknownErr;
	    }

//	Clean up.
	if ( err != noErr && *bundlePtr != nil) {
		CFRelease ( *bundlePtr );
		*bundlePtr = nil;
		}

	if ( bundleURL != nil )
		CFRelease ( bundleURL );
	if ( baseURL != nil )
		CFRelease ( baseURL );
	
	return err;
	}