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File: bitops.php

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  Classes of mehmet emin akyüz  >  BMP2GD  >  bitops.php  >  Download  
File: bitops.php
Role: Auxiliary script
Content type: text/plain
Description: Simple utility functions to handle bit operations
Class: BMP2GD
Convert images in the BMP format
Author: By
Last change:
Date: 2010-01-06 05:23
Size: 671 bytes
 

Contents

Class file image Download
<?php
function getBit($bytes,$n)
{
    $n=1<<$n;
    return $bytes & $n;
}

function setBit($bytes,$n)
{
    $n=1<<$n;
    return $bytes | $n;
}

function printBits($bytes,$l=8,$d=0)
{
    $b='';
    for($i=$l-1;$i>-1;--$i){
        if($i!=0 && $d!=0 && $i%$d==0)$b.=' ';
        if(getBit($bytes,$i))$b.='1';
        else $b.='0';
    }
    return $b;
}

function printBitsR($bytes,$l=8,$d=0)
{
    $b='';
    for($i=0;$i<$l;++$i){
        if($i!=0 && $d!=0 && $i%$d==0)$b.=' ';
        if(getBit($bytes,$i))$b.='1';
        else $b.='0';
    }
    return $b;
}

function getBitsetInt($bytes,$bitCount,$n){
    $x=0;
    $y=$bytes;
    for($i=0;$i<$bitCount;++$i){
        $x|= (1 << $i);
    }
    
    for($i=0;$i<$n;$i++){
        $y=$y >> 1;
    }
    
    return $x & $y;
}
?>