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| const COMPRESSION_FORMAT_NONE = 0; COMPRESSION_FORMAT_DEFAULT = 1; FILE_DEVICE_FILE_SYSTEM = 9; METHOD_BUFFERED = 0; FILE_READ_DATA = 1; FILE_WRITE_DATA = 2; FSCTL_SET_COMPRESSION = (FILE_DEVICE_FILE_SYSTEM shl 16) or ((FILE_READ_DATA or FILE_WRITE_DATA) shl 14) or (16 shl 2) or METHOD_BUFFERED;
function CompressFile(FileName: PChar; forceCompress: Boolean): Boolean; var hnd: Integer; Comp: SHORT; res: DWORD; begin if forceCompress or ((GetFileAttributes(PChar(ExtractFilePath(FileName))) and FILE_ATTRIBUTE_COMPRESSED) <> 0) then begin Result := False; if (GetFileAttributes(FileName) and FILE_ATTRIBUTE_COMPRESSED) = 0 then begin hnd := CreateFile(FileName, GENERIC_READ or GENERIC_WRITE, 0,nil, OPEN_EXISTING, 0,0); try Comp := COMPRESSION_FORMAT_DEFAULT; if not DeviceIoControl(hnd, FSCTL_SET_COMPRESSION, @Comp, SizeOf(SHORT), nil, 0, res, nil) then Exit; finally CloseHandle(hnd); end; end; Result := True; end else Result := True; end;
function UnCompressFile(FileName: PChar): Boolean; var hnd: Integer; Comp: SHORT; res: DWORD; begin Result := False; if (GetFileAttributes(FileName) and FILE_ATTRIBUTE_COMPRESSED) <> 0 then begin hnd := CreateFile(FileName, GENERIC_READ or GENERIC_WRITE, 0,nil, OPEN_EXISTING, 0,0); try Comp := COMPRESSION_FORMAT_NONE; if not DeviceIoControl(hnd, FSCTL_SET_COMPRESSION, @Comp, SizeOf(SHORT), nil, 0, res, nil) then Exit; finally CloseHandle(hnd); end; Result := True; end else Result := True; end; |