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crc.c
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crc.c
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#include "system.h"
#include "packet.h"
BYTE CRCTableHi[256]={0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40};
BYTE CRCTableLo[256]={0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04,
0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8,
0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10,
0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C,
0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0,
0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C,
0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54,
0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98,
0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40};
WORD CreateCRC(BYTE *buffer, DWORD size)
{
DWORD i;
BYTE r,CRCHi=0xFF,CRCLo=0xFF;
for (i=0; i<size; i++)
{
r=buffer[i]^CRCHi;
CRCHi=CRCLo^CRCTableHi[r];
CRCLo=CRCTableLo[r];
}
return (CRCHi<<8) | CRCLo;
}
WORD PackEx(BYTE *cbuf,WORD csize,BYTE *ibuf,BYTE *obuf,WORD size)
{
WORD i,c=0;
BYTE r,CRCHi=0xFF,CRCLo=0xFF;
obuf[0]=PKP_LEADER;
for (i=0; i<csize; i++)
{
switch (cbuf[i]){
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=cbuf[i];
break;
}
r=cbuf[i]^CRCHi;
CRCHi=CRCLo^CRCTableHi[r];
CRCLo=CRCTableLo[r];
}
for (i=0; i<size; i++)
{
switch (ibuf[i]){
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=ibuf[i];
break;
}
r=ibuf[i]^CRCHi;
CRCHi=CRCLo^CRCTableHi[r];
CRCLo=CRCTableLo[r];
}
switch(CRCLo)
{
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=CRCLo;
break;
}
switch(CRCHi)
{
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=CRCHi;
break;
}
obuf[++c]=PKP_SUFFIX;
return c+1;
}
WORD Pack(BYTE *ibuf,BYTE *obuf,WORD size)
{
WORD i,c=0;
BYTE r,CRCHi=0xFF,CRCLo=0xFF;
obuf[0]=PKP_LEADER;
for (i=0; i<size; i++)
{
switch (ibuf[i]){
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=ibuf[i];
break;
}
r=ibuf[i]^CRCHi;
CRCHi=CRCLo^CRCTableHi[r];
CRCLo=CRCTableLo[r];
}
switch(CRCLo)
{
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=CRCLo;
break;
}
switch(CRCHi)
{
case PKP_LEADER:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_LEADER+1;
break;
case PKP_SUFFIX:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_SUFFIX+1;
break;
case PKP_FILLCH:
obuf[++c]=PKP_FILLCH;
obuf[++c]=PKP_FILLCH+1;
break;
default:
obuf[++c]=CRCHi;
break;
}
obuf[++c]=PKP_SUFFIX;
return c+1;
}
int dePack(BYTE *ibuf,BYTE *obuf,int size)
{
int i=1,c=0;
BYTE r,CRCHi=0xFF,CRCLo=0xFF;
if (ibuf[0]!=PKP_LEADER || ibuf[size-1]!=PKP_SUFFIX) return 0;
while (i<size-1 && c<PKP_MAX_LENGTH)
{
switch(ibuf[i]){
case PKP_FILLCH:
obuf[c++]=ibuf[i+1]-1;
i+=2;
break;
default:
obuf[c++]=ibuf[i++];
break;
}
}
for (i=0;i<c-2;i++)
{
r=obuf[i]^CRCHi;
CRCHi=CRCLo^CRCTableHi[r];
CRCLo=CRCTableLo[r];
}
if (obuf[c-1]!=CRCHi || obuf[c-2]!=CRCLo) return 0;
else return c-2;
}