windows-server-2003/net/sfm/uam/macsource/uam_common/uamprefs.cpp

// ===========================================================================
//	UAMPrefs.cpp 			© 1998-2002 Microsoft Corp. All rights reserved.
// ===========================================================================
// 	Preference file manipulation routines for the Microsoft UAM.
//

#ifdef UAM_TARGET_CARBON
#include <CoreFoundation/CoreFoundation.h>
#include <Carbon/Carbon.h>
#endif

#include <String.h>
#include <macstrsafe.h>

#include "UAMDebug.h"
#include "UAMPrefs.h"


UAM_PREFERENCES	gUAMPreferences;


// ---------------------------------------------------------------------------
//		¥ UAM_OpenOrCreateFile()
// ---------------------------------------------------------------------------
//	Open or create and open the resource fork of a file.
//

SInt16 UAM_OpenOrCreateFile(
		FSSpec*		inSpec,
		OSType		inCreator,
		OSType		inFileType
)
{
	SInt16	theRefNum	= -1;
	OSErr	theError;
	
	theError = FSpOpenDF(inSpec, fsRdWrPerm, &theRefNum);
	
	if (theError == fnfErr)
	{
		//
		//The file does not exist, create a new file.
		//
		theError = FSpCreate(inSpec, inCreator, inFileType, 0);
			
		if (theError == noErr)
		{
			theError = FSpOpenDF(inSpec, fsRdWrPerm, &theRefNum);
		}
	}
	
	if ((theRefNum == -1) || (theError != noErr))
	{
		DbgPrint_((DBGBUFF, "Failed to open preference file (%d)!", theError));
	}
	
	return(theRefNum);
}


// ---------------------------------------------------------------------------
//		¥ UAM_OpenPreferenceFile()
// ---------------------------------------------------------------------------
//	Opens the preference file by name.
//

SInt16 UAM_OpenPreferenceFile()
{
	FSSpec		theSpec;
	SInt16		theRefNum	= -1;	//assume failure
	SInt16		theVRefNum	= 0;
	SInt32		theDirID	= 0;
	OSErr		theError	= noErr;
	
	theError = FindFolder(
					kOnSystemDisk,
					kPreferencesFolderType,
					kCreateFolder,
					&theVRefNum,
					&theDirID
					);
	
	if (theError == noErr)
	{
		//
		//Create the file spec that will point to the file.
		//
		theError = FSMakeFSSpec(
						theVRefNum,
						theDirID,
						UAM_PREFERENCE_FILE_NAME,
						&theSpec
						);
		
		if ((theError == noErr) || (theError == fnfErr))
		{
			theRefNum = UAM_OpenOrCreateFile(
								&theSpec,
								'MACS',
								'pref'
								);
		}
		else
		{
			//
			//There was a failure creating the spec that we cannot handle. Nothing
			//to do unless we're in debug.
			//
			DbgPrint_((DBGBUFF, "Failed to create pref file spec (%d)", ResError()));
		}
	}
	
	return(theRefNum);
}


// ---------------------------------------------------------------------------
//		¥ UAM_RetrieveUAMPreferenceData()
// ---------------------------------------------------------------------------
//	Retrieves the preferences data saved in the file.
//

OSErr UAM_RetrieveUAMPreferenceData(
		PUAM_PREFERENCES	ioUAMPrefs
)
{
	OSErr			theError			= noErr;
	SInt16			theRefNum			= -1;
	SInt32			theSize;
	UAM_PREFERENCES	thePrefs;
	
	//
	//Open the resource fork of the preferences file.
	//
	theRefNum = UAM_OpenPreferenceFile();
	
	if (theRefNum >= 0)
	{
		theError = SetFPos(theRefNum, fsFromStart, 0);
		
		if (theError != noErr)
		{
			DbgPrint_((DBGBUFF, "FSSetForkPosition() failed! (%d)", theError));
		}

		//
		//Read in the preference file data.
		//
		theSize		= sizeof(UAM_PREFERENCES);
		theError 	= FSRead(theRefNum, &theSize, &thePrefs);
		
		//
		//If there is an error or there is a discrepancy in the number
		//of bytes we read in, bail.
		//
		if (theError != noErr)
		{
			DbgPrint_((DBGBUFF, "Reading from prefs file failed! (%d)", theError));
			
			if (theError != eofErr)
			{
				FSClose(theRefNum);
				return(theError);
			}
		}
	}
		
	if ((theError == eofErr) || (theSize == 0) || (theRefNum == -1))
	{
		DbgPrint_((DBGBUFF, "Setting default preferences..."));
		
		//
		//The preference file did not exist or we can't open the file, 
		//return the defaults.
		//
		ioUAMPrefs->flags |= UAM_PREFS_REQUIRE_STRONG_ENCRYPTION;
		
		//
		//Not really necessary, but we do it anyway.
		//
		ioUAMPrefs->reserved1	= 0;
		ioUAMPrefs->reserved2	= 0;
		
		theError = noErr;
	}
	else
	{
		BlockMove(&thePrefs, ioUAMPrefs, sizeof(UAM_PREFERENCES));
		
		DbgPrint_((DBGBUFF, "Pref flags = 0x%x", ioUAMPrefs->flags));
	}
	
	FSClose(theRefNum);
	
	return(theError);
}


// ---------------------------------------------------------------------------
//		¥ UAM_SaveUAMPreferenceData()
// ---------------------------------------------------------------------------
//	Saves the preferences data to file.
//

OSErr UAM_SaveUAMPreferenceData(
		PUAM_PREFERENCES	inUAMPrefs
)
{
	SInt16	theRefNum			= -1;
	OSErr	theError			= noErr;
	SInt32	theSize;
	
	//
	//Open the resource fork of the preferences file.
	//
	theRefNum = UAM_OpenPreferenceFile();
	
	if (theRefNum >= 0)
	{
		theError = SetFPos(theRefNum, fsFromStart, 0);
		
		if (theError != noErr)
		{
			DbgPrint_((DBGBUFF, "FSSetForkPosition() failed! (%d)", theError));
		}
		else
		{
			theSize		= sizeof(UAM_PREFERENCES);
			theError 	= FSWrite(theRefNum, &theSize, inUAMPrefs);
			
			if (theError != noErr)
			{
				DbgPrint_((DBGBUFF, "Writing to prefs file failed! (%d)", theError));
			}
			else if (theSize == sizeof(UAM_PREFERENCES))
			{
				DbgPrint_((DBGBUFF, "Preferences successfully written to disk"));
			}
		}
		
		FSClose(theRefNum);
	}
	
	return(theError);
}