clrghouz/app/helpers.php

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PHP
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2019-05-11 01:17:56 +00:00
<?php
/**
* Calculate CCITT-CRC16 checksum
*/
if (! function_exists('crc16')) {
function crc16($data)
{
$crc = 0x0000;
for ($i = 0; $i < strlen($data); $i++)
{
$x = (($crc >> 8) ^ ord($data[$i])) & 0xFF;
$x ^= $x >> 4;
$crc = (($crc << 8) ^ ($x << 12) ^ ($x << 5) ^ $x) & 0xFFFF;
}
return $crc;
}
}
/**
* Dump out data into a hex dump
*/
if (! function_exists('hex_dump')) {
function hex_dump($data,$newline="\n",$width=16)
{
$result = '';
$pad = '.'; # padding for non-visible characters
$to = $from = '';
for ($i=0; $i<=0xFF; $i++)
{
$from .= chr($i);
$to .= ($i >= 0x20 && $i <= 0x7E) ? chr($i) : $pad;
}
$hex = str_split(bin2hex($data),$width*2);
$chars = str_split(strtr($data,$from,$to),$width);
$offset = 0;
foreach ($hex as $i => $line)
{
$result .= sprintf('%08X: %-48s [%s]%s',
$offset,
substr_replace(implode(' ',str_split($line,2)),' ',8*3,0),
$chars[$i],
$newline);
$offset += $width;
}
return $result;
}
}