CRC16の値が合わなくて悩む。。
クライアントとサーバーで作り手が違うといろいろと問題が発生します。
今回はCRC16の値が合わなくていろいろなんでだと言う話になりました。
いままでは以前のソースを持ってきて各言語に変換したりしていましたが、
一概にCRC16と言ってもいろいろあるようで
CRC16−CITTってのを使えと言う話になりましが。。。
CRC16−CITTにも右送り、左送り、初期値、ＸＯＲの有無で
8通りの値が出てきます。。。。
まあちゃんとネゴ取らないと合うわけ無いですね。
と言うことでＪＡＶＡのソースです。
JAVAにはUnsigned無いので値がマイナスにならないように変わりにintを使ってます。
※括弧とタブは全角にしてあります。
特殊文字大なり、小なりも変換してあります。
>>
public class CRC16CITT {
private static int CHAR_BIT = 8;
//1+ X^5 + X^12 + X^16
//0001 0000 0010 0001 (0x1021) 左
//1000 0100 0000 1000 (0x8408) 右
private static int CCITT_TABLE_L= {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
};
private static int CCITT_TABLE_R= {
0x0000,0x1189,0x2312,0x329b,0x4624,0x57ad,0x6536,0x74bf,
0x8c48,0x9dc1,0xaf5a,0xbed3,0xca6c,0xdbe5,0xe97e,0xf8f7,
0x1081,0x0108,0x3393,0x221a,0x56a5,0x472c,0x75b7,0x643e,
0x9cc9,0x8d40,0xbfdb,0xae52,0xdaed,0xcb64,0xf9ff,0xe876,
0x2102,0x308b,0x0210,0x1399,0x6726,0x76af,0x4434,0x55bd,
0xad4a,0xbcc3,0x8e58,0x9fd1,0xeb6e,0xfae7,0xc87c,0xd9f5,
0x3183,0x200a,0x1291,0x0318,0x77a7,0x662e,0x54b5,0x453c,
0xbdcb,0xac42,0x9ed9,0x8f50,0xfbef,0xea66,0xd8fd,0xc974,
0x4204,0x538d,0x6116,0x709f,0x0420,0x15a9,0x2732,0x36bb,
0xce4c,0xdfc5,0xed5e,0xfcd7,0x8868,0x99e1,0xab7a,0xbaf3,
0x5285,0x430c,0x7197,0x601e,0x14a1,0x0528,0x37b3,0x263a,
0xdecd,0xcf44,0xfddf,0xec56,0x98e9,0x8960,0xbbfb,0xaa72,
0x6306,0x728f,0x4014,0x519d,0x2522,0x34ab,0x0630,0x17b9,
0xef4e,0xfec7,0xcc5c,0xddd5,0xa96a,0xb8e3,0x8a78,0x9bf1,
0x7387,0x620e,0x5095,0x411c,0x35a3,0x242a,0x16b1,0x0738,
0xffcf,0xee46,0xdcdd,0xcd54,0xb9eb,0xa862,0x9af9,0x8b70,
0x8408,0x9581,0xa71a,0xb693,0xc22c,0xd3a5,0xe13e,0xf0b7,
0x0840,0x19c9,0x2b52,0x3adb,0x4e64,0x5fed,0x6d76,0x7cff,
0x9489,0x8500,0xb79b,0xa612,0xd2ad,0xc324,0xf1bf,0xe036,
0x18c1,0x0948,0x3bd3,0x2a5a,0x5ee5,0x4f6c,0x7df7,0x6c7e,
0xa50a,0xb483,0x8618,0x9791,0xe32e,0xf2a7,0xc03c,0xd1b5,
0x2942,0x38cb,0x0a50,0x1bd9,0x6f66,0x7eef,0x4c74,0x5dfd,
0xb58b,0xa402,0x9699,0x8710,0xf3af,0xe226,0xd0bd,0xc134,
0x39c3,0x284a,0x1ad1,0x0b58,0x7fe7,0x6e6e,0x5cf5,0x4d7c,
0xc60c,0xd785,0xe51e,0xf497,0x8028,0x91a1,0xa33a,0xb2b3,
0x4a44,0x5bcd,0x6956,0x78df,0x0c60,0x1de9,0x2f72,0x3efb,
0xd68d,0xc704,0xf59f,0xe416,0x90a9,0x8120,0xb3bb,0xa232,
0x5ac5,0x4b4c,0x79d7,0x685e,0x1ce1,0x0d68,0x3ff3,0x2e7a,
0xe70e,0xf687,0xc41c,0xd595,0xa12a,0xb0a3,0x8238,0x93b1,
0x6b46,0x7acf,0x4854,0x59dd,0x2d62,0x3ceb,0x0e70,0x1ff9,
0xf78f,0xe606,0xd49d,0xc514,0xb1ab,0xa022,0x92b9,0x8330,
0x7bc7,0x6a4e,0x58d5,0x495c,0x3de3,0x2c6a,0x1ef1,0x0f78
};
public static int getCRC16CittL00(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, true, (int) 0x0000, (int) 0x0000);
}
public static int getCRC16CittLf0(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, true, (int) 0xFFFF, (int) 0x0000);
}
public static int getCRC16CittL0f(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, true, (int) 0x0000, (int) 0xFFFF);
}
public static int getCRC16CittLff(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, true, (int) 0xFFFF, (int) 0xFFFF);
}
public static int getCRC16CittR00(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, false, (int) 0x0000, (int) 0x0000);
}
public static int getCRC16CittRf0(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, false, (int) 0xFFFF, (int) 0x0000);
}
public static int getCRC16CittR0f(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, false, (int) 0x0000, (int) 0xFFFF);
}
public static int getCRC16CittRff(byte ptr) {
return getCRC16CittBase(ptr, ptr.length, true, false, (int) 0xFFFF, (int) 0xFFFF);
}
private static int getCRC16CittBase(byte ptr, int len, boolean citt, boolean il, int iStUsort, int iEndUshort)
{
short da;
int value = iStUsort;
for (int i = 0; i < len; i++)
{
if(il)
{
//LEFT
if(citt)
{
value = (value << CHAR_BIT) ^ CCITT_TABLE_L[((value >>> （16 - CHAR_BIT）） ^ ptr[i]) & 0xff];
}
//da = (short) (value >>> 8);
//value <<= 8;
//value ^= CCITT_TABLE_L[(da ^ ptr[i]) & 0xff];
}else{
//RIGHT
if(citt)
{
value = ((value >>> CHAR_BIT) ^ CCITT_TABLE_R[(value ^ ptr[i]) & 0xff]);
}
}
}
//return Unsigned Short;
return getUnsignedByte(（short） （value ^ iEndUshort）);
}
public static int getUnsignedByte(short data)
{
return data & 0x0FFFF;
}
public static void main(String args)
{
byte bp[] = { -2, -2, -2, 11, 15, 4, 94, 40, -60, 0, 0, 0, 4, 4, 3, 2, 1 };
System.out.println(Integer.toHexString(getCRC16CittL00(bp)));
System.out.println(Integer.toHexString(getCRC16CittLf0(bp)));
System.out.println(Integer.toHexString(getCRC16CittL0f(bp)));
System.out.println(Integer.toHexString(getCRC16CittLff(bp)));
System.out.println(Integer.toHexString(getCRC16CittR00(bp)));
System.out.println(Integer.toHexString(getCRC16CittRf0(bp)));
System.out.println(Integer.toHexString(getCRC16CittR0f(bp)));
System.out.println(Integer.toHexString(getCRC16CittRff(bp)));
}
}
