www.pudn.com > M2Engine.rar > EDcode.pas

unit EDcode; 
 
interface 
 
uses 
  Windows, SysUtils, {Classes, Hutil32,} Grobal2, M2Share; 
const 
  OLDMODE = 0; //ÀÏ°æ±¾±àÂë 
  NEWMODE = 1; //а汾±àÂë 
  ENDECODEMODE = OLDMODE; 
function EncodeMessage(sMsg: TDefaultMessage): string; 
function DecodeMessage(Str: string): TDefaultMessage; 
function EncodeString(Str: string): string; 
function DeCodeString(Str: string): string; 
function EncodeBuffer(Buf: PChar; bufsize: Integer): string; 
procedure DecodeBuffer(Src: string; Buf: PChar; bufsize: Integer); 
procedure Decode6BitBuf(sSource: PChar; pBuf: PChar; nSrcLen, nBufLen: Integer); 
procedure Encode6BitBuf(pSrc, pDest: PChar; nSrcLen, nDestLen: Integer); 
function MakeDefaultMsg(wIdent: Word; nRecog: Integer; wParam, wTag, wSeries: Word): TDefaultMessage; 
//var 
//  CSEncode: TRTLCriticalSection; 
 
implementation 
var 
  n4CEEF4: Integer = $408D4D; 
  n4CEEF8: Integer = $0C08BA52E; 
  w4CEF00: Word = $8D34; 
  DecodeBitMasks: array[0..255] of Byte = ( 
    $2A, $E7, $18, $6F, $63, $9D, $48, $EA, $39, $CD, $38, $B8, $A0, $AB, $E0, $10, 
    $35, $99, $37, $09, $C0, $69, $B2, $A4, $67, $88, $50, $34, $7F, $FC, $0B, $BE, 
    $0C, $44, $59, $B6, $5B, $9C, $65, $D6, $94, $EB, $C4, $3B, $03, $3C, $C9, $3E, 
    $6B, $9A, $D4, $F6, $C3, $4D, $11, $24, $AA, $FF, $4A, $ED, $95, $93, $D9, $46, 
    $5F, $96, $87, $30, $BA, $CA, $CB, $FA, $8A, $1A, $68, $5C, $AC, $07, $40, $60, 
    $29, $70, $57, $53, $41, $12, $DE, $1D, $64, $14, $97, $72, $FB, $8D, $2B, $08, 
    $CF, $F4, $3A, $00, $C5, $91, $56, $A9, $9E, $71, $BC, $A3, $AF, $A6, $55, $DA, 
    $79, $BB, $33, $A5, $25, $15, $7D, $EE, $C1, $2C, $C7, $D0, $19, $D8, $5A, $E8, 
    $85, $FD, $2F, $6A, $78, $45, $DB, $B5, $F5, $1E, $04, $75, $B0, $7A, $20, $F2, 
    $DF, $D3, $83, $F3, $54, $90, $A2, $C6, $0F, $80, $36, $4E, $C8, $01, $82, $76, 
    $A1, $2E, $84, $86, $0E, $47, $8F, $E1, $F9, $7C, $C2, $74, $DC, $26, $22, $CE, 
    $2D, $4F, $BF, $0D, $73, $27, $21, $B3, $98, $1F, $89, $EC, $FE, $52, $0A, $8C, 
    $9F, $A8, $E5, $E6, $06, $8B, $CC, $F7, $5E, $E3, $7B, $D2, $05, $49, $13, $E9, 
    $66, $B7, $AD, $B4, $F8, $A7, $1C, $F1, $02, $7E, $6E, $17, $62, $4C, $77, $8E, 
    $DD, $F0, $43, $28, $6D, $61, $B9, $D7, $BD, $3D, $9B, $92, $16, $EF, $51, $23, 
    $E2, $B1, $81, $31, $32, $58, $D1, $5D, $D5, $6C, $4B, $E4, $AE, $42, $1B, $3F 
    ); 
 
  n4CEEFC: Integer = $408D97; 
 
  EncodeBitMasks: array[0..255] of Byte = ( 
    $8C, $87, $0D, $85, $D4, $64, $63, $E5, $BA, $7E, $B8, $68, $9D, $9F, $F5, $BC, 
    $A0, $E3, $3A, $22, $19, $21, $39, $78, $EE, $27, $36, $15, $74, $C7, $97, $C9, 
    $CE, $E2, $7B, $4C, $98, $A1, $C2, $59, $41, $C0, $1E, $2E, $95, $EB, $DE, $69, 
    $1D, $5B, $53, $DA, $F4, $0A, $4F, $BB, $B7, $24, $33, $0F, $C8, $84, $29, $89, 
    $3C, $1C, $08, $49, $C6, $FE, $CC, $23, $3E, $E1, $4E, $8B, $13, $E7, $1A, $5D, 
    $CF, $B1, $47, $8F, $D8, $72, $4B, $93, $6E, $73, $4D, $94, $DD, $82, $14, $A7, 
    $03, $F9, $F1, $C5, $8D, $79, $2A, $C4, $DC, $60, $5F, $D7, $62, $B5, $E9, $B3, 
    $B6, $12, $A8, $32, $D9, $C3, $6A, $75, $4A, $A2, $0C, $26, $91, $5A, $AD, $6D, 
    $44, $10, $B4, $46, $1B, $66, $81, $20, $FD, $7F, $88, $25, $9C, $71, $D3, $E6, 
    $80, $E4, $FA, $42, $9B, $37, $01, $FC, $DB, $45, $6B, $FB, $56, $F0, $AF, $9A, 
    $BF, $AB, $D6, $CD, $02, $F2, $7C, $AA, $B2, $92, $FF, $57, $2F, $86, $A6, $7D, 
    $35, $17, $34, $D5, $0E, $65, $09, $05, $28, $CA, $48, $31, $8E, $2D, $DF, $52, 
    $F6, $1F, $A4, $50, $76, $40, $18, $04, $8A, $16, $2B, $AE, $43, $3F, $D0, $CB, 
    $6C, $55, $54, $96, $99, $30, $67, $5E, $2C, $AC, $E0, $7A, $E8, $58, $90, $BE, 
    $A5, $6F, $B0, $70, $EC, $61, $5C, $06, $3B, $77, $C1, $07, $EA, $A9, $F8, $11, 
    $BD, $F3, $00, $ED, $83, $EF, $3D, $A3, $51, $9E, $38, $F7, $0B, $B9, $D2, $D1 
    ); 
  //var 
  //  EncBuf,TempBuf:PChar; 
function MakeDefaultMsg(wIdent: Word; nRecog: Integer; wParam, wTag, wSeries: Word): TDefaultMessage; 
begin 
  Result.Recog := nRecog; 
  Result.Ident := wIdent; 
  Result.Param := wParam; 
  Result.Tag := wTag; 
  Result.Series := wSeries; 
end; 
{$IF USECODE = USEREMOTECODE} 
procedure Encode6BitBuf(pSrc, pDest: PChar; nSrcLen, nDestLen: Integer); 
var 
  Proc: procedure(pSrc, pDest: PChar; nSrcLen, nDestLen: Integer); 
begin 
  Proc := Pointer(g_Config.Encode6BitBuf); 
  Proc(pSrc, pDest, nSrcLen, nDestLen); 
end; 
{$ELSE} 
procedure Encode6BitBuf(pSrc, pDest: PChar; nSrcLen, nDestLen: Integer); 
var 
  i: Integer; 
  nRestCount: Integer; 
  nDestPos: Integer; 
  btMade: Byte; 
  btCh: Byte; 
  btRest: Byte; 
begin 
  nRestCount := 0; 
  btRest := 0; 
  nDestPos := 0; 
  for i := 0 to nSrcLen - 1 do begin 
    if nDestPos >= nDestLen then break; 
    btCh := Byte(pSrc[i]); 
{$IF ENDECODEMODE = NEWMODE} 
    btCh := (EncodeBitMasks[btCh] xor n4CEEFC) xor n4CEEF4; 
    btCh := btCh xor (Hibyte(LoWord(n4CEEF8)) + LoByte(LoWord(n4CEEF8))); 
{$IFEND} 
    btMade := Byte((btRest or (btCh shr (2 + nRestCount))) and $3F); 
    btRest := Byte(((btCh shl (8 - (2 + nRestCount))) shr 2) and $3F); 
    Inc(nRestCount, 2); 
 
    if nRestCount < 6 then begin 
      pDest[nDestPos] := Char(btMade + $3C); 
      Inc(nDestPos); 
    end else begin 
      if nDestPos < nDestLen - 1 then begin 
        pDest[nDestPos] := Char(btMade + $3C); 
        pDest[nDestPos + 1] := Char(btRest + $3C); 
        Inc(nDestPos, 2); 
      end else begin 
        pDest[nDestPos] := Char(btMade + $3C); 
        Inc(nDestPos); 
      end; 
      nRestCount := 0; 
      btRest := 0; 
    end; 
  end; 
  if nRestCount > 0 then begin 
    pDest[nDestPos] := Char(btRest + $3C); 
    Inc(nDestPos); 
  end; 
  pDest[nDestPos] := #0; 
end; 
{$IFEND} 
{ 
procedure Decode6BitBuf (sSource:PChar;pBuf:PChar;nSrcLen,nBufLen:Integer); 
var 
  Proc:procedure (sSource:PChar;pBuf:PChar;nSrcLen,nBufLen:Integer); 
begin 
  Proc:=Pointer(g_Config.Encode6BitBuf); 
  if assigned(Proc) then 
    Proc(sSource,pBuf,nSrcLen,nBufLen); 
end; 
} 
procedure Decode6BitBuf(sSource: PChar; pBuf: PChar; nSrcLen, nBufLen: Integer); 
const 
  Masks: array[2..6] of Byte = ($FC, $F8, $F0, $E0, $C0); 
  //($FE, $FC, $F8, $F0, $E0, $C0, $80, $00); 
var 
  i, {nLen,} nBitPos, nMadeBit, nBufPos: Integer; 
  btCh, btTmp, btByte: Byte; 
begin 
  //  nLen:= Length (sSource); 
  nBitPos := 2; 
  nMadeBit := 0; 
  nBufPos := 0; 
  btTmp := 0; 
  for i := 0 to nSrcLen - 1 do begin 
    if Integer(sSource[i]) - $3C >= 0 then 
      btCh := Byte(sSource[i]) - $3C 
    else begin 
      nBufPos := 0; 
      break; 
    end; 
    if nBufPos >= nBufLen then break; 
    if (nMadeBit + 6) >= 8 then begin 
      btByte := Byte(btTmp or ((btCh and $3F) shr (6 - nBitPos))); 
{$IF ENDECODEMODE = NEWMODE} 
      btByte := btByte xor (Hibyte(LoWord(n4CEEF8)) + LoByte(LoWord(n4CEEF8))); 
      btByte := btByte xor LoByte(LoWord(n4CEEF4)); 
      btByte := DecodeBitMasks[btByte] xor LoByte(w4CEF00); 
{$IFEND} 
      pBuf[nBufPos] := Char(btByte); 
      Inc(nBufPos); 
      nMadeBit := 0; 
      if nBitPos < 6 then Inc(nBitPos, 2) 
      else begin 
        nBitPos := 2; 
        Continue; 
      end; 
    end; 
    btTmp := Byte(Byte(btCh shl nBitPos) and Masks[nBitPos]); // #### ##-- 
    Inc(nMadeBit, 8 - nBitPos); 
  end; 
  pBuf[nBufPos] := #0; 
 
  { 
    nLen:= Length (sSource); 
    nBitPos:= 2; 
    nMadeBit:= 0; 
    nBufPos:= 0; 
    btTmp:= 0; 
    for I:= 1 to nLen do begin 
      if Integer(sSource[I]) - $3C >= 0 then 
        btCh := Byte(sSource[I]) - $3C 
      else begin 
        nBufPos := 0; 
        break; 
      end; 
      if nBufPos >= nBufLen then break; 
      if (nMadeBit + 6) >= 8 then begin 
        btByte := Byte(btTmp or ((btCh and $3F) shr (6- nBitPos))); 
        pBuf[nBufPos] := Char(btByte); 
        Inc(nBufPos); 
        nMadeBit := 0; 
        if nBitPos < 6 then Inc (nBitPos, 2) 
        else begin 
          nBitPos := 2; 
          continue; 
        end; 
      end; 
      btTmp:= Byte (Byte(btCh shl nBitPos) and Masks[nBitPos]);   // #### ##-- 
      Inc(nMadeBit, 8 - nBitPos); 
    end; 
    pBuf[nBufPos] := #0; 
    } 
end; 
 
function DecodeMessage(Str: string): TDefaultMessage; 
var 
  EncBuf: array[0..BUFFERSIZE - 1] of Char; 
  Msg: TDefaultMessage; 
begin 
  Decode6BitBuf(PChar(Str), @EncBuf, Length(Str), SizeOf(EncBuf)); 
  Move(EncBuf, Msg, SizeOf(TDefaultMessage)); 
  Result := Msg; 
  { 
  try 
     EnterCriticalSection (CSencode); 
     Decode6BitBuf (str, EncBuf, 1024); 
     Move (EncBuf^, msg, sizeof(TDefaultMessage)); 
     Result := msg; 
  finally 
   LeaveCriticalSection (CSencode); 
  end; 
  } 
end; 
 
function DeCodeString(Str: string): string; 
var 
  EncBuf: array[0..BUFFERSIZE - 1] of Char; 
begin 
  Decode6BitBuf(PChar(Str), @EncBuf, Length(Str), SizeOf(EncBuf)); 
  Result := StrPas(EncBuf); 
  { 
    try 
      EnterCriticalSection (CSencode); 
      Decode6BitBuf (str, EncBuf, BUFFERSIZE); 
      Result := StrPas (EncBuf); //error, 1, 2, 3,... 
    finally 
      LeaveCriticalSection (CSencode); 
    end;} 
end; 
 
procedure DecodeBuffer(Src: string; Buf: PChar; bufsize: Integer); 
var 
  EncBuf: array[0..BUFFERSIZE - 1] of Char; 
begin 
  Decode6BitBuf(PChar(Src), @EncBuf, Length(Src), SizeOf(EncBuf)); 
  Move(EncBuf, Buf^, bufsize); 
  { 
  try 
     EnterCriticalSection (CSencode); 
     Decode6BitBuf (src, EncBuf, BUFFERSIZE); 
     Move (EncBuf^, buf^, bufsize); 
  finally 
   LeaveCriticalSection (CSencode); 
  end; 
  } 
end; 
 
function EncodeMessage(sMsg: TDefaultMessage): string; 
var 
  EncBuf, TempBuf: array[0..BUFFERSIZE - 1] of Char; 
begin 
  Move(sMsg, TempBuf, SizeOf(TDefaultMessage)); 
  Encode6BitBuf(@TempBuf, @EncBuf, SizeOf(TDefaultMessage), SizeOf(EncBuf)); 
  Result := StrPas(EncBuf); 
  { 
  EnterCriticalSection(CSencode); 
  try 
    Move (smsg, TempBuf^, sizeof(TDefaultMessage)); 
    Encode6BitBuf(TempBuf, EncBuf, sizeof(TDefaultMessage), 1024); 
    Result:=StrPas(EncBuf);  //Error: 1, 2, 3, 4, 5, 6, 7, 8, 9 
  finally 
    LeaveCriticalSection(CSencode); 
  end; 
  } 
end; 
 
function EncodeString(Str: string): string; 
var 
  EncBuf: array[0..BUFFERSIZE - 1] of Char; 
begin 
  Encode6BitBuf(PChar(Str), @EncBuf, Length(Str), SizeOf(EncBuf)); 
  Result := StrPas(EncBuf); 
  { 
  EnterCriticalSection(CSencode); 
  try 
    Encode6BitBuf(PChar(str), EncBuf, Length(str), BUFFERSIZE); 
    Result:=StrPas(EncBuf); 
  finally 
    LeaveCriticalSection(CSencode); 
  end; 
  } 
end; 
 
function EncodeBuffer(Buf: PChar; bufsize: Integer): string; 
var 
  EncBuf, TempBuf: array[0..BUFFERSIZE - 1] of Char; 
begin 
  if bufsize < BUFFERSIZE then begin 
    Move(Buf^, TempBuf, bufsize); 
    Encode6BitBuf(@TempBuf, @EncBuf, bufsize, SizeOf(EncBuf)); 
    Result := StrPas(EncBuf); 
  end else Result := ''; 
  { 
  EnterCriticalSection (CSencode); 
  try 
    if bufsize < BUFFERSIZE then begin 
      Move (buf^, TempBuf^, bufsize); 
      Encode6BitBuf (TempBuf, EncBuf, bufsize, BUFFERSIZE); 
      Result := StrPas (EncBuf); 
    end else Result := ''; 
  finally 
    LeaveCriticalSection (CSencode); 
  end; 
  } 
end; 
 
initialization 
  begin 
    //  GetMem (EncBuf, 10240 + 100); //BUFFERSIZE + 100); 
    //  GetMem (TempBuf, 10240); //2048); 
    //  InitializeCriticalSection (CSEncode); 
  end; 
 
 
finalization 
  begin 
    //  FreeMem (EncBuf, BUFFERSIZE + 100); 
    //  FreeMem (TempBuf, 2048); 
    //  DeleteCriticalSection (CSEncode); 
  end; 
 
end.