acFileStorage equivalent

searching for a vcl that can enable embed any files within dfm similar to acfilestorage

When there are bugs with the file naming, then the porting wasn't completely done. The problem with "malformed" strings is still always the same. A string is treated as ANSI, but since Delphi 2009 the strings in Delphi has the Unicode format. What means, a string of Length 5 needs 10 bytes to store. Another typical fault is to treat a Unicode Buffer as ANSI. Such things leads always into "malformed" strings.

Now, you need to change the way the file name is stored. The function "WriteStream(…)" should be something like this…

Code:

procedure TStoredFile.WriteData(Stream: TStream);
var
  Buffer: TArray<Byte>;
  TheSize: Cardinal;
  Target: Pointer;
begin
  // storing the file name
  Buffer := TEncoding.UTF8.GetBytes(FFileName);       <- The filename is converted to UTF8…
  TheSize := Length(Buffer);
  Stream.Write(TheSize, 4);
  Stream.Write(Buffer, 0, TheSize);                   <- …and the bytes will be written

  // pack and write data
  TheSize := SFCalcTargetSz(FSize); // calculate required size for taget buffer
  GetMem(Target, TheSize);
  try
    TheSize := SFPack(FData.Memory, Target, FSize);
    Stream.Write(TheSize, 4); // compressed size
    Stream.Write(Target^, TheSize); // original size and compressed data
  finally
    FreeMem(Target);
  end;
end;

Here is the function "ReadStream(…)"…

Code:

procedure TStoredFile.ReadData(Stream: TStream);
var
  Buffer: TArray<Byte>;
  TheSize: Cardinal;
  Source: Pointer;
begin
  // reading the file name
  Stream.Read(TheSize, SizeOf(TheSize));
  SetLength(Buffer, TheSize);
  Stream.Read(Buffer, 0, TheSize);                              <- Read the UTF8 Bytes…
  FFileName := TEncoding.UTF8.GetString(Buffer, 0, TheSize);    <- …and convert them back to Unicode

  // reading the file size
  Stream.Read(TheSize, 4); // compressed size
  if (Owner = nil) or TacFileStorage(Owner).Compressed then
  begin
    dec(TheSize, 4);
    GetMem(Source, TheSize); // allocating memory for compressed buffer
    Stream.Read(FSize, 4); // original size
    FData.SetSize(FSize); // allocating memory for decompressed buffer
    try
      Stream.Read(Source^, TheSize); // reading compressed data
      SFUnpack(Source, FData.Memory, TheSize);
    finally
      FreeMem(Source);
    end
  end
  else // this is for compatibility with older versions
  begin
    FSize := TheSize;
    FData.SetSize(FSize);
    // reading the stream
    Stream.ReadBuffer(FData.Memory^, FSize);
  end;
end;

The filename is stored in the format UTF8 byte, which allows in the best case one Byte for one Character. Please remember Unicode needs two Bytes per Character.

Useless to say, that this is a breaking change. The chance is high, that existing streams couldn't be read sucessfulyy. In this case the DFM should be clear manually. I should be enough to remove the content of the property "StoredData = { ... }", which is easy to find. The component could then be loaded again.


Note: Now, it's not recommended to use the component TacFileStorage, because in the worst case a file with 1 MiB became 2 MiB, because of it is stored as Hex string. It would be much better to use a resource file that is unpacked on run-time.

https://www.board4allcz.eu/showthread.php?t=626035