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Subversion Repositories versatile_library

[/] [versatile_library/] [trunk/] [misc/] [VersatileCounter.class.php] - Rev 136

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<?php

class VersatileCounter {
    
    static 
$masks = array(
        
         
=> 0x3,
         
=> 0x6,
         
=> 0xC,
         
=> 0x14,
         
=> 0x30,
         
=> 0x60,
         
=> 0xB8,
         
=> 0x110,
        
10 => 0x240,
        
11 => 0x500,
        
12 => 0x829,
        
13 => 0x100C,
        
14 => 0x2015,
        
15 => 0x6000,
        
16 => 0xD008,
        
17 => 0x12000,
        
18 => 0x20400,
        
19 => 0x40023,
        
20 => 0x90000,
        
21 => 0x140000,
        
22 => 0x300000,
        
23 => 0x420000,
        
24 => 0xE10000,
        
25 => 0x1200000,
        
26 => 0x2000023,
        
27 => 0x4000013,
        
28 => 0xC800000,
        
29 => 0x14000000,
        
30 => 0x20000029,
        
31 => 0x48000000,
        
32 => 0x80200003

    
);
    
    private 
$length$mask;
    
    private 
$state 0;
    
    function 
__construct($length 8) {
        
$this->length $length;
        
$this->mask self::$masks[$length];
    }
    
    function 
state() {
        return 
sprintf("%0" $this->length "b",$this->state);
    }
    
    function 
tick() {
        
        
$ns = ($this->state 2) & (pow(2,$this->length) - 1);
        
        
$new $this->state pow(2,$this->length 1);
        
        for(
$i $this->length 2;$i >= 0;$i--) {
            
            if(
$this->mask pow(2,$i)) {
                
$new = (int) ($new xor ($this->state pow(2,$i)));
            }
            
        }
        
        if(
$new == 0) {
            
$ns++;
        }
        
        
$this->state $ns;
        
    }
    
    function 
run($ticks,$output false) {
        
        if(
$output) {
            
printf("%" strlen($ticks) . "u: %0" $this->length "b\n",0,$this->state);
        }
        
        for(
$i=0;$i<$ticks;$i++) {
            
$this->tick();
            if(
$output) {
                
printf("%" strlen($ticks) . "u: %0" $this->length "b\n",$i+1,$this->state);
            }
        }
        
    }
    
    static function 
GetState($length,$ticks) {
        
        
$VC = new self($length);
        
$VC->run($ticks);
        
        return 
$VC->state;
        
    }
    
}

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