Код: Выделить всё
CONST crctab: ARRAY[0..255] OF WORD = (
$0000, $C0C1, $C181, $0140, $C301, $03C0, $0280, $C241,
$C601, $06C0, $0780, $C741, $0500, $C5C1, $C481, $0440,
$CC01, $0CC0, $0D80, $CD41, $0F00, $CFC1, $CE81, $0E40,
$0A00, $CAC1, $CB81, $0B40, $C901, $09C0, $0880, $C841,
$D801, $18C0, $1980, $D941, $1B00, $DBC1, $DA81, $1A40,
$1E00, $DEC1, $DF81, $1F40, $DD01, $1DC0, $1C80, $DC41,
$1400, $D4C1, $D581, $1540, $D701, $17C0, $1680, $D641,
$D201, $12C0, $1380, $D341, $1100, $D1C1, $D081, $1040,
$F001, $30C0, $3180, $F141, $3300, $F3C1, $F281, $3240,
$3600, $F6C1, $F781, $3740, $F501, $35C0, $3480, $F441,
$3C00, $FCC1, $FD81, $3D40, $FF01, $3FC0, $3E80, $FE41,
$FA01, $3AC0, $3B80, $FB41, $3900, $F9C1, $F881, $3840,
$2800, $E8C1, $E981, $2940, $EB01, $2BC0, $2A80, $EA41,
$EE01, $2EC0, $2F80, $EF41, $2D00, $EDC1, $EC81, $2C40,
$E401, $24C0, $2580, $E541, $2700, $E7C1, $E681, $2640,
$2200, $E2C1, $E381, $2340, $E101, $21C0, $2080, $E041,
$A001, $60C0, $6180, $A141, $6300, $A3C1, $A281, $6240,
$6600, $A6C1, $A781, $6740, $A501, $65C0, $6480, $A441,
$6C00, $ACC1, $AD81, $6D40, $AF01, $6FC0, $6E80, $AE41,
$AA01, $6AC0, $6B80, $AB41, $6900, $A9C1, $A881, $6840,
$7800, $B8C1, $B981, $7940, $BB01, $7BC0, $7A80, $BA41,
$BE01, $7EC0, $7F80, $BF41, $7D00, $BDC1, $BC81, $7C40,
$B401, $74C0, $7580, $B541, $7700, $B7C1, $B681, $7640,
$7200, $B2C1, $B381, $7340, $B101, $71C0, $7080, $B041,
$5000, $90C1, $9181, $5140, $9301, $53C0, $5280, $9241,
$9601, $56C0, $5780, $9741, $5500, $95C1, $9481, $5440,
$9C01, $5CC0, $5D80, $9D41, $5F00, $9FC1, $9E81, $5E40,
$5A00, $9AC1, $9B81, $5B40, $9901, $59C0, $5880, $9841,
$8801, $48C0, $4980, $8941, $4B00, $8BC1, $8A81, $4A40,
$4E00, $8EC1, $8F81, $4F40, $8D01, $4DC0, $4C80, $8C41,
$4400, $84C1, $8581, $4540, $8701, $47C0, $4680, $8641,
$8201, $42C0, $4380, $8341, $4100, $81C1, $8081, $4040 );
function crc16(twoSym:array of Word; size:Word):Word;
var
i:Integer;
crc:Word;
begin
crc:=$FFFF;
for i:=0 to ((size div 2)-1) do
begin
crc:= (crc shr 8) xor CrcTab[(crc and $FF) xor twoSym[i]];
end;
Result:=(crc shr 8) or (crc shl 8);
end;
function ByteToDecInt(Value: String): Integer;
const hex:array['A'..'F'] of Word=(10,11,12,13,14,15);
var
Int,i:Integer;
begin
If value<>'' then
begin
Int:=0;
for i := 1 to Length(Value) do
if Value[i] < 'A' then Int := Int * 16 + ORD(Value[i]) - 48
else Int := Int * 16 + HEX[Value[i]];
Result:=int;
end;
end;
function crccontrol(paket:string):boolean;
var
bx: array[1..50] of Word;
i,j:integer;
crc:Word;
crckont:string;
begin
If paket<>'' then
begin
j:=1;
for i := 1 to Length(paket) do
begin
bx[i]:=ByteToDecInt(paket[j]+paket[j+1]);
j:=j+2;
end;
crc:= crc16(bx, Length(paket)-4);
bx[20]:=crc;
bx[21]:=ByteToDecInt(paket[Length(paket)-3]+paket[Length(paket)-2]+paket[Length(paket)-1]+paket[Length(paket)]);
If bx[20]=bx[21] then
Result:=true
else
Result:=false;
end;
end;