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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: 4 years ago
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!=&& $d!=&& $i%$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!=&& $d!=&& $i%$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|= (<< $i);
    }
    
    for(
$i=0;$i<$n;$i++){
        
$y=$y >> 1;
    }
    
    return 
$x $y;
}
?>