63 lines
1.4 KiB
PHP
63 lines
1.4 KiB
PHP
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<?php
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namespace App\Traits;
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trait CRC
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{
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private function CRC16USD(string $string): int
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{
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$crc = self::CRC16USD_INIT;
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for ($c=0;$c<strlen($string);$c++)
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$crc = $this->CRC16USD_UPDATE(ord($string[$c]),$crc);
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return $crc;
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}
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private function CRC16USD_UPDATE($b,$crc): int
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{
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return (self::crc16usd_tab[(($crc >> 8) ^ $b) & 0xff] ^ (($crc & 0x00ff) << 8)) & 0xffff;
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}
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/**
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* Calculate CRC32
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*
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* @param string $string
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* @param bool $finish
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* @return int
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*/
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private function CRC32(string $string,bool $finish=TRUE): int
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{
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$crc = 0xffffffff;
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for ($i=0;$i<strlen($string);$i++)
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$crc = (self::crc32_tab[($crc^ord($string[$i])) & 0xff] ^ (($crc>>8) & 0x00ffffff)) & 0xffffffff;
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return $finish ? $this->CRC32_FINISH($crc) : $crc;
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}
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private function CRC32_FINISH($crc)
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{
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return ~$crc & 0xffffffff;
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}
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private function CRC32_UPDATE($b,$crc)
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{
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return ((self::crc32_tab[($crc^$b) & 0xff] ^ (($crc>>8) & 0x00ffffff)) & 0xffffffff);
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}
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private function LSZ_INIT_CRC()
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{
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return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? self::LSZ_INIT_CRC32 : self::LSZ_INIT_CRC16;
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}
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private function LSZ_FINISH_CRC($crc)
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{
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return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? $this->CRC32_FINISH($crc) : $crc;
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}
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private function LSZ_UPDATE_CRC($b,$crc)
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{
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return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? $this->CRC32_UPDATE($b,$crc) : $this->CRC16USD_UPDATE($b,$crc);
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}
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}
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