uDecode123.pas ( File view )

  • By sathex 2016-03-20
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			unit uDecode123;

interface

uses Sysutils,Windows,Classes;

type TpfINITDecode=function (Handle: THANDLE): integer; cdecl;
type TpfDECODE=function (Handle: THANDLE;Input: pointer;InputSize: integer;Output: pointer; OutputSize: integer; var Done: integer): integer; cdecl;
type TpfCANCELDecode=function (Handle: THANDLE): integer; cdecl;

Const MPBUFFER_SIZE=64*1024;

type TDecode123=class(TObject)
  protected
  private
    mvarDLLHandle: HMODULE;
    mvarApplicationFolder: String;
    mvarMP: THANDLE;
    mvarBuffer: PBYTEARRAY;
    mvarDataInBuffer: DWORD;
    mvarGeneratedDLL: string;
    pfINITDecode: TpfINITDecode;
    pfCANCELDecode: TpfCANCELDecode;
    pfDECODE: TpfDECODE;
    procedure setApplicationFolder(const Value: String);
    function getPendingDataSize: DWORD;
  public
    property ApplicationFolder: String read mvarApplicationFolder write setApplicationFolder;
    property PendingDataSize: DWORD read getPendingDataSize;
    function Decode(Buffer: PBYTEARRAY; InputSize: integer): Boolean;
    procedure GetAllDataInBuffer(var Buffer: PBYTEARRAY; var BufferSize: integer);
    constructor Create;
    Destructor Destroy; override;
end;

implementation

{
 TDecode123 
}

constructor TDecode123.Create;
var
    Ex: Exception;
    rs: TResourceStream;
    f: TFileStream;
begin
    mvarMP:=0;
    mvarBuffer:=nil;
    mvarGeneratedDLL:=mvarApplicationFolder+'MPGLIB_'+inttostr(GetTickCount())+'.dll';
    Sleep(20); //Assure unique name for each DLL.
    if not FileExists(mvarApplicationFolder+'MPGLIB.dll') then begin
        rs := TResourceStream.Create( hinstance, 'DECODE123DLL', RT_RCDATA );
        try
            f:=TFileStream.Create(mvarGeneratedDLL,fmCreate);
            f.CopyFrom(rs,rs.Size);
            F.Free;
        finally
            rs.free;
        end;
    end else begin
        CopyFile(pchar(mvarApplicationFolder+'MPGLIB.dll'),pchar(mvarGeneratedDLL),TRUE);
    end;
    mvarDLLHandle:=LoadLibrary(pchar(mvarGeneratedDLL));
    if mvarDLLHandle=0 Then Begin
        Ex:=Exception.Create('Unable to load MPGLIB.dll');
        Raise Ex;
        Exit;
    end;
    pfINITDecode:=GetProcAddress(mvarDLLHandle,'MpgLib_OpenStream');
    pfCANCELDecode:=GetProcAddress(mvarDLLHandle,'MpgLib_CloseStream');
    pfDECODE:=GetProcAddress(mvarDLLHandle,'MpgLib_DecodeChunk');

    if (not Assigned(pfINITDecode)) or (not Assigned(pfCANCELDecode)) or (not Assigned(pfDECODE)) Then begin
       //Invalid DLL
        FreeLibrary(mvarDLLHandle);
        mvarDLLHandle:=0;
        Ex:=Exception.Create('Invalid MPGLIB.dll');
        Raise Ex;
    end;
    pfINITDecode(mvarMP);
    GetMem(mvarBuffer,MPBUFFER_SIZE);
    m
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