CRC16 LH в скрипте

[andrei_it]

Подскажите , как реализовать подсчет CRC16 LH в скрипте (у меня это String). Пробовал вот такой код (нашел яндексом) ругается на function...

Код: (delphi)

function CalculateCRC16(const APacket;
  const APacketSize : integer) : Word;
const
  ArrayCRCHi : array [0..255] of byte = (
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $01, $C0, $80, $41,
    $00, $C1, $81, $40, $00, $C1, $81, $40, $01, $C0,
    $80, $41, $01, $C0, $80, $41, $00, $C1, $81, $40,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $00, $C1,
    $81, $40, $01, $C0, $80, $41, $01, $C0, $80, $41,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $00, $C1,
    $81, $40, $00, $C1, $81, $40, $01, $C0, $80, $41,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $00, $C1, $81, $40,
    $01, $C0, $80, $41, $01, $C0, $80, $41, $00, $C1,
    $81, $40, $01, $C0, $80, $41, $00, $C1, $81, $40,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $00, $C1, $81, $40,
    $01, $C0, $80, $41, $00, $C1, $81, $40, $01, $C0,
    $80, $41, $01, $C0, $80, $41, $00, $C1, $81, $40,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $01, $C0, $80, $41,
    $00, $C1, $81, $40, $00, $C1, $81, $40, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $01, $C0, $80, $41,
    $01, $C0, $80, $41, $00, $C1, $81, $40, $01, $C0,
    $80, $41, $00, $C1, $81, $40, $00, $C1, $81, $40,
    $01, $C0, $80, $41, $01, $C0, $80, $41, $00, $C1,
    $81, $40, $00, $C1, $81, $40, $01, $C0, $80, $41,
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
    $80, $41, $00, $C1, $81, $40);
  ArrayCRCLo : array [0..255] of byte = (
    $00, $C0, $C1, $01, $C3, $03, $02, $C2, $C6, $06,
    $07, $C7, $05, $C5, $C4, $04, $CC, $0C, $0D, $CD,
    $0F, $CF, $CE, $0E, $0A, $CA, $CB, $0B, $C9, $09,
    $08, $C8, $D8, $18, $19, $D9, $1B, $DB, $DA, $1A,
    $1E, $DE, $DF, $1F, $DD, $1D, $1C, $DC, $14, $D4,
    $D5, $15, $D7, $17, $16, $D6, $D2, $12, $13, $D3,
    $11, $D1, $D0, $10, $F0, $30, $31, $F1, $33, $F3,
    $F2, $32, $36, $F6, $F7, $37, $F5, $35, $34, $F4,
    $3C, $FC, $FD, $3D, $FF, $3F, $3E, $FE, $FA, $3A,
    $3B, $FB, $39, $F9, $F8, $38, $28, $E8, $E9, $29,
    $EB, $2B, $2A, $EA, $EE, $2E, $2F, $EF, $2D, $ED,
    $EC, $2C, $E4, $24, $25, $E5, $27, $E7, $E6, $26,
    $22, $E2, $E3, $23, $E1, $21, $20, $E0, $A0, $60,
    $61, $A1, $63, $A3, $A2, $62, $66, $A6, $A7, $67,
    $A5, $65, $64, $A4, $6C, $AC, $AD, $6D, $AF, $6F,
    $6E, $AE, $AA, $6A, $6B, $AB, $69, $A9, $A8, $68,
    $78, $B8, $B9, $79, $BB, $7B, $7A, $BA, $BE, $7E,
    $7F, $BF, $7D, $BD, $BC, $7C, $B4, $74, $75, $B5,
    $77, $B7, $B6, $76, $72, $B2, $B3, $73, $B1, $71,
    $70, $B0, $50, $90, $91, $51, $93, $53, $52, $92,
    $96, $56, $57, $97, $55, $95, $94, $54, $9C, $5C,
    $5D, $9D, $5F, $9F, $9E, $5E, $5A, $9A, $9B, $5B,
    $99, $59, $58, $98, $88, $48, $49, $89, $4B, $8B,
    $8A, $4A, $4E, $8E, $8F, $4F, $8D, $4D, $4C, $8C,
    $44, $84, $85, $45, $87, $47, $46, $86, $82, $42,
    $43, $83, $41, $81, $80, $40);
var
  i, Index : integer;
  CRCHi, CRCLo : byte;
begin
  CRCHi := $FF;
  CRCLo := $FF;
  for i:=0 to APacketSize-1 do
  begin
    Index := CRCHi xor byte(PAnsiChar(@APacket)[i]);
    CRCHi := CRCLo xor ArrayCRCHi[Index];
    CRCLo := ArrayCRCLo[Index];
  end;
  result := (CRCHi shl 8) or CRCLo; \\(CRCHi shl 8) 
end; 

[pan2000]

Вычисление CRC16 для строки (без нулевых байтов!):

Код: (delphi)

function CalculateCRC16(const APacket: string; const APacketSize : integer) : Word;
const
  ArrayCRCHi : array [0..255] of byte = (
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
  . . .
    $43, $83, $41, $81, $80, $40);

var
  i, Index : integer;
  CRCHi, CRCLo : byte;
begin
  CRCHi := $FF;
  CRCLo := $FF;
  for i := 1 to APacketSize do
  begin
    Index := CRCHi xor byte(APacket[i]);
    CRCHi := CRCLo xor ArrayCRCHi[Index];
    CRCLo := ArrayCRCLo[Index];
  end;
  CalculateCRC16 := (CRCHi shl 8) or CRCLo; //(CRCHi shl 8)
end;

Вычисление CRC16 для байтового массива:

Код: (delphi)

function CalculateCRC16(const APacket: array of byte; const APacketSize : integer) : Word;
const
  ArrayCRCHi : array [0..255] of byte = (
    $00, $C1, $81, $40, $01, $C0, $80, $41, $01, $C0,
  . . .
    $43, $83, $41, $81, $80, $40);

var
  i, Index : integer;
  CRCHi, CRCLo : byte;
begin
  CRCHi := $FF;
  CRCLo := $FF;
  for i := 0 to APacketSize - 1 do
  begin
    Index := CRCHi xor APacket[i];
    CRCHi := CRCLo xor ArrayCRCHi[Index];
    CRCLo := ArrayCRCLo[Index];
  end;
  CalculateCRC16 := (CRCHi shl 8) or CRCLo; //(CRCHi shl 8)
end;

Во вложении пример глобальной функции вычисления CRC для байтового массива.
 

[andrei_it]

Спасибо! пошел пробовать.