Add Zmodem/BINKP/EMSI

app/Traits/CRC.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Traits;
+
+trait CRC
+{
+	private function CRC16USD(string $string): int
+	{
+		$crc = self::CRC16USD_INIT;
+
+		for ($c=0;$c<strlen($string);$c++)
+			$crc = $this->CRC16USD_UPDATE(ord($string[$c]),$crc);
+
+		return $crc;
+	}
+
+	private function CRC16USD_UPDATE($b,$crc): int
+	{
+		return (self::crc16usd_tab[(($crc >> 8) ^ $b) & 0xff] ^ (($crc & 0x00ff) << 8)) & 0xffff;
+	}
+
+	/**
+	 * Calculate CRC32
+	 *
+	 * @param string $string
+	 * @param bool $finish
+	 * @return int
+	 */
+	private function CRC32(string $string,bool $finish=TRUE): int
+	{
+		$crc = 0xffffffff;
+
+		for ($i=0;$i<strlen($string);$i++)
+			$crc = (self::crc32_tab[($crc^ord($string[$i])) & 0xff] ^ (($crc>>8) & 0x00ffffff)) & 0xffffffff;
+
+		return $finish ? $this->CRC32_FINISH($crc) : $crc;
+	}
+
+	private function CRC32_FINISH($crc)
+	{
+		return ~$crc & 0xffffffff;
+	}
+
+	private function CRC32_UPDATE($b,$crc)
+	{
+		return ((self::crc32_tab[($crc^$b) & 0xff] ^ (($crc>>8) & 0x00ffffff)) & 0xffffffff);
+	}
+
+	private function LSZ_INIT_CRC()
+	{
+		return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? self::LSZ_INIT_CRC32 : self::LSZ_INIT_CRC16;
+	}
+
+	private function LSZ_FINISH_CRC($crc)
+	{
+		return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? $this->CRC32_FINISH($crc) : $crc;
+	}
+
+	private function LSZ_UPDATE_CRC($b,$crc)
+	{
+		return ($this->ls_Protocol & self::LSZ_OPTCRC32) ? $this->CRC32_UPDATE($b,$crc) : $this->CRC16USD_UPDATE($b,$crc);
+	}
+}