Complex user access

BlitzMax Forums/BlitzMax Programming/Complex user access

Retimer

(Posted 2008) [#1]

I remembered a plugin for the half-life engine using this method for using a single number for complex 'user access' to several different permissions. It is a bit more complex in code but a lot more simple for database/binary file structure. I figured I would share the example for carebear giggles.

Edit blitzmax/mod/brl.mod/retro.mod/retro.bmx
insert at bottom:

Function ShortBin$( val )
	Local buf:Short[16]
	For Local k=15 To 0 Step -1
		buf[k]=(val&1)+Asc("0")
		val:Shr 1
	Next
	Return String.FromShorts( buf,16 )
End Function

Function ByteBin$( val )
	Local buf:Short[8]
	For Local k=7 To 0 Step -1
		buf[k]=(val&1)+Asc("0")
		val:Shr 1
	Next
	Return String.FromShorts( buf,8 )
End Function

and rebuild brl.retro

The above gives you the ability to shorten the amount of permissions in your single integer access; shorten the binary version of the number.
ByteBin - 8
ShortBin - 16

Bin - 32
LongBin - 64

In the example, I use shortbin:

Const MappingAccess	:Byte=1 	'Binary 1
Const BanAccess		:Byte=2		'Binary 2
Const KickAccess	:Byte=3		'Binary 4
'Const etc...		:byte=4		'Binary 8
'Const etc...		:byte=5		'Binary 16
'Const etc...		:byte=6		'Binary 32

Global AccessLevel:Int = 5 '(Mapping access + kick access) in binary = 1+4 = 5.
'Looks like this in binary: 0000000000000101

Print "Access to Mapping: " + HasAccess(AccessLevel,MappingAccess)
Print "Access to Banning: " + HasAccess(AccessLevel,BanAccess)
Print "Access to Kicking: " + HasAccess(AccessLevel,KickAccess)


Function HasAccess:Int(Level:Int,Tier:Int) 
	If Tier <=0 Then Return 0
	Local TmpAC:String = shortbin$(Level)
	Return TmpAC[TmpAc.Length-tier]-48
End Function

By adding the values of certain permissions, and using the single integer from the result, you can get a lot more information by using several booleans within a numbers binary information.

Not that much of a saver, but nifty anyways.

Time