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