Ti.Stream.createStream() makes trouble on Android

Hi folks, for manual uploading of an image I have to embed the raw image data between the boundaries and headers (Mime). Because the camera deploys TiBlob and I have to convert the TiBlob to Buffer.

header = '';
header += '--' + BOUNDARY + CRLF + 'Content-Disposition: form-data; name="mytext"' + CRLF + 'Content-Type: text/plain' + CRLF + CRLF + xmlString + CRLF;
header += '--' + BOUNDARY + CRLF + 'Content-Disposition: form-data; name="myfile"; filename="' + filename + '"' + CRLF +'Content-Type: image/jpeg' + CRLF + CRLF;
var full_content = Ti.createBuffer({
        value : header
});
streamMedia = Ti.Stream.createStream({
        source : imageBlob ,
        mode : Ti.Stream.MODE_READ
    });
// here the important code line::::
full_content.append(Ti.Stream.readAll(streamMedia));
// :::::
full_content.append(Ti.createBuffer({
        value : CRLF + '--' + BOUNDARY + '--' + CRLF
}));

For debugging pupuse I send the builded body to my local machine. On iPhone all is good, but on Android the image is modified and a part of image readers cannot display. I have opened multipart stuff and stripped from boundaries and headers.

ls -alshow a difference:

-rw-r--r--  1 rainerschleevoigt  staff   858586 Jul  4 14:47 JPG.bin
-rw-r--r--@ 1 rainerschleevoigt  staff   861242 Jul  4 14:49 MULTIPART.bin

The head and tail is same, but the converted image is a little bigger. Here the hexdums: original JPG, stripped Post