UBitManager.pas ( File view )

  • By sathex 2016-03-20
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			unit UBitManager;

interface

uses Windows,Sysutils;

type TBitManager=Class(Tobject)
  private
    procedure SetBitOffset(const Value: DWORD);
    function EndianChange(const Value: LongWord): LongWord;
    function IsBitOffsetOutOfBound(Value: DWORD): Boolean;
    function GetByteOffSet: DWORD;
    function GetPointerToCurrent: Pointer;
  protected
    mvarMemBuffer: PBYTEARRAY;
    mvarBitOffset: DWORD;
    mvarBufferSize: DWORD;
  public
    property MemoryBuffer: PBYTEARRAY read mvarMemBuffer write mvarMemBuffer;
    property BufferSize: DWORD read mvarBufferSize write mvarBufferSize;
    property BitOffset: DWORD read mvarBitOffset write SetBitOffset;
    property ByteOffSet: DWORD read GetByteOffSet;
    property PointerToCurrent: Pointer read GetPointerToCurrent;
    Function GetBits(BitAmount: DWORD): DWORD;
    function GetString(Characters: integer): string;
    procedure Skip(BitAmount: DWORD);
    procedure Back(BitAmount: DWORD);
    Constructor Create;
end;

implementation

{
 TBitManager 
}

constructor TBitManager.Create;
begin
    mvarMemBuffer:=nil;
    mvarBitOffSet:=0;
    mvarBufferSize:=$FFFFFFFF;//unlimited...
end;

function TBitManager.GetBits(BitAmount: DWORD): DWORD;
var
    rVal: LongWord;
    PB: PChar;
    BitIndex: DWORD;
    ByteIndex: DWORD;
    Value: DWORD;
    PW: PDWORD;
    Ex: Exception;
begin
    if (BitAmount=0) Then begin
        Result:=0;
        Exit;
    end;
    if IsBitOffsetOutOfBound(mvarBitOffset+BitAmount) Then begin
        Ex:=Exception.Create('BitManager.- Last bits out of bounds.');
        Ex.Free;
        Result:=0;
        Exit;
    end;
    ByteIndex:=mvarBitOffset div 8;
    BitIndex:= mvarBitOffset mod 8;
    if (BitAmount>24) Then begin
        if (BitAmount=32) and (BitIndex=0) Then begin
            PW:=PDWORD(@mvarMemBuffer[ByteIndex]);
            Value:=PW^;
            Result:=EndianChange(Value);
            inc(mvarBitOffset,BitAmount);
            Exit;
        end;
        rVal:=GetBits(24);
        rVal:=rVal shl (BitAmount - 24);
        rVal:=rVal or GetBits(BitAmount - 24);
        Result:=rVal;
        Exit;
    end;
    PB:=@mvarmemBuffer[ByteIndex];
    rVal := PBYTE(PB)^;
    rval:=rval shl 8;
    rval:=rval or PBYTE(PB+1)^;
    rVal:=rval shl 8;
    rval:=rval or PBYTE(PB+2)^;
    rVal:=rval shl BitIndex;
    rval:=rval and $ffffff;

    inc(mvarBitOffset,BitAmount);

    rval:=rVal shr (24-BitAmount);

    Result:=rVal;
end;

procedure TBitManager.SetBitOffset(const Value: DWORD);
var
    Ex: Exception;
begin
    if IsBitOffsetOutOfBound(Value) Then begin
        Ex:=Exception.Create('BitManager.- Bit offset out of range.');
        Ex.Free;
    end else begin
        mvarBitOffset:=Value;
    end;
end;

function TBitM
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