当前位置：首页 > article >正文

android 计算CRC

article 2025/1/18 13:04:17

<?php
/**
* 将一个字符按比特位进行反转 eg: 65 (01000001) --> 130(10000010)
* @param $char
* @return $char
*/
function reverseChar($char) {
$byte = ord($char);
$tmp = 0;
for ($i = 0; $i < 8; ++$i) {
if ($byte & (1 << $i)) {
$tmp |= (1 << (7 - $i));
}
}
return chr($tmp);
}

/**
* 将一个字节流按比特位反转 eg: 'AB'(01000001 01000010) --> '\x42\x82'(01000010 10000010)
* @param $str
*/
function reverseString($str) {
$m = 0;
$n = strlen($str) - 1;
while ($m <= $n) {
if ($m == $n) {
$str{$m} = reverseChar($str{$m});
break;
}
$ord1 = reverseChar($str{$m});
$ord2 = reverseChar($str{$n});
$str{$m} = $ord2;
$str{$n} = $ord1;
$m++;
$n--;
}
return $str;
}

/**
* @param string $str 待校验字符串
* @param int $polynomial 二项式
* @param int $initValue 初始值
* @param int $xOrValue 输出结果前异或的值
* @param bool $inputReverse 输入字符串是否每个字节按比特位反转
* @param bool $outputReverse 输出是否整体按比特位反转
* @return int
*/
function crc16($str, $polynomial, $initValue, $xOrValue, $inputReverse = false, $outputReverse = false) {
$crc = $initValue;

for ($i = 0; $i < strlen($str); $i++) {
if ($inputReverse) {
// 输入数据每个字节按比特位逆转
$c = ord(reverseChar($str{$i}));
} else {
$c = ord($str{$i});
}
$crc ^= ($c << 8);
for ($j = 0; $j < 8; ++$j) {
if ($crc & 0x8000) {
$crc = (($crc << 1) & 0xffff) ^ $polynomial;
} else {
$crc = ($crc << 1) & 0xffff;
}
}
}
if ($outputReverse) {
// 把低地址存低位，即采用小端法将整数转换为字符串
$ret = pack('cc', $crc & 0xff, ($crc >> 8) & 0xff);
// 输出结果按比特位逆转整个字符串
$ret = reverseString($ret);
// 再把结果按小端法重新转换成整数
$arr = unpack('vshort', $ret);
$crc = $arr['short'];
}
return $crc ^ $xOrValue;
}

printf("%x\n", crc16('1234567890', 0x8005, 0, 0, true, true));
//0A 09 02 01 03
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0, 0, true, true));
printf("%x\n", crc16('0A09020103', 0x8005, 0, 0, true, true));
echo " ";
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0xffff, 0, true, true));
printf("%x\n", crc16('0A09020103', 0x8005, 0xffff, 0, true, true));
echo " ";
/* 列举一些常用的crc16算法 */

// CRC-16/IBM
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0, 0, true, true));

// CRC-16/MAXIM
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0, 0xffff, true, true));

// CRC-16/USB
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0xffff, 0xffff, true, true));

// CRC-16/MODBUS
printf("%x\n", crc16('0A 09 02 01 03', 0x8005, 0xffff, 0, true, true));

// CRC-16/CCITT
printf("%x\n", crc16('0A 09 02 01 03', 0x1021, 0, 0, true, true));

// CRC-16/CCITT-FALSE
printf("%x\n", crc16('0A 09 02 01 03', 0x1021, 0xffff, 0, false, false));

// CRC-16/X25
printf("%x\n", crc16('0A 09 02 01 03', 0x1021, 0xffff, 0xffff, true, true));

// CRC-16/XMODEM
printf("%x\n", crc16('0A 09 02 01 03', 0x1021, 0, 0, false, false));

// CRC-16/DNP
printf("%x\n", crc16('0A 09 02 01 03', 0x3d65, 0, 0xffff, true, true));

echo " 0A09020103 ";
// CRC-16/IBM
printf("%x\n", crc16('0A09020103', 0x8005, 0, 0, true, true));

// CRC-16/MAXIM
printf("%x\n", crc16('0A09020103', 0x8005, 0, 0xffff, true, true));

// CRC-16/USB
printf("%x\n", crc16('0A09020103', 0x8005, 0xffff, 0xffff, true, true));

// CRC-16/MODBUS
printf("%x\n", crc16('0A09020103', 0x8005, 0xffff, 0, true, true));

// CRC-16/CCITT
printf("%x\n", crc16('0A09020103', 0x1021, 0, 0, true, true));

// CRC-16/CCITT-FALSE
printf("%x\n", crc16('0A09020103', 0x1021, 0xffff, 0, false, false));

// CRC-16/X25
printf("%x\n", crc16('0A 09 02 01 03', 0x1021, 0xffff, 0xffff, true, true));

// CRC-16/XMODEM
printf("%x\n", crc16('0A09020103', 0x1021, 0, 0, false, false));

// CRC-16/DNP
printf("%x\n", crc16('0A09020103', 0x3d65, 0, 0xffff, true, true));

$crc_table = array(
0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0);
//0A09020103
function genCRC (&$ptr)
{
$crc = 0x0000;
$crc_table = $GLOBALS['crc_table'];
for ($i = 0; $i < strlen($ptr); $i++)
$crc = $crc_table[(($crc>>8) ^ ord($ptr[$i]))] ^ (($crc<<8) & 0x00FFFF);
return $crc;
}

echo " ". crc162("0A09020103");

function crc16LSBMSB($data) {
$crc = 0x0000; // 初始值，对于LSB-MSB模式常见初始值设为0x0000
$poly = 0xA001; // CRC16（LSB-MSB）对应的多项式

for ($i = 0; $i < strlen($data); $i++) {
$crc ^= ord($data[$i]);
for ($j = 0; $j < 8; $j++) {
if ($crc & 0x0001) {
$crc = ($crc >> 1) ^ $poly;
} else {
$crc >>= 1;
}
$crc &= 0xFFFF; // 确保crc值保持在16位范围内
}
}

return $crc;
}

// 示例用法
$data = "Hello, World!";
$crcValue = crc16LSBMSB($data);
echo "CRC-16(LSB-MSB)值为: ".dechex($crcValue)."\n";

//0A09020103
$data = "0A 09 02 01 03";
$crcValue = crc16LSBMSB($data);
echo " CRC-16(LSB-MSB)值为: ".dechex($crcValue)."\n";

function crc16MSBLSB($data) {
$crc = 0xFFFF; // 初始值，CRC-16（MSB-LSB）常用的初始值设定为0xFFFF
$poly = 0x8005; // CRC-16（MSB-LSB）对应的多项式

for ($i = 0; $i < strlen($data); $i++) {
$crc ^= ord($data[$i]) << 8;
for ($j = 0; $j < 8; $j++) {
if ($crc & 0x8000) {
$crc = ($crc << 1) ^ $poly;
} else {
$crc <<= 1;
}
$crc &= 0xFFFF; // 确保crc值保持在16位范围内
}
}

return $crc;
}

$data = "0A 09 02 01 03";
$crcValue = crc16MSBLSB($data);
echo " 33333333333==CRC-16(LSB-MSB)值为: ".dechex($crcValue)."\n";

$data = "0A09020103";
$crcValue = crc16MSBLSB($data);
echo " 33333333333==CRC-16(LSB-MSB)值为: ".dechex($crcValue)."\n";

function hexToByteArray($hexString) {
$byteArray = [];
$length = strlen($hexString);
for ($i = 0; $i < $length; $i += 2) {
$byteArray[] = hexdec(substr($hexString, $i, 2));
}
return $byteArray;
}

function crc16MSBLSB东方($dataArray) {
$crc = 0xFFFF;
$poly = 0x8005;

for ($i = 0; $i < count($dataArray); $i++) {
$crc ^= $dataArray[$i] << 8;
for ($j = 0; $j < 8; $j++) {
if ($crc & 0x8000) {
$crc = ($crc << 1) ^ $poly;
} else {
$crc <<= 1;
}
$crc &= 0xFFFF;
}
}

return $crc;
}

// 示例用法
$hexData = "0A09020103";
$byteArray = hexToByteArray($hexData);
echo " CRC-16(MSB-LSB)值为: ".$byteArray."\n";
$crcValue = crc16MSBLSB东方($byteArray);
echo " CRC-16(MSB-LSB)值为: ".dechex($crcValue)."\n";

查看全文

http://www.kler.cn/a/442340.html