Create JPEG thumb image with general fixed header

I want to create preview thumb for my photos like Facebook's preview photo. My plan:

• Sender: generate a scaled thumb (with 30px max dimension) from original photo, strip out all fixed header to send.
• Receiver: From the "minified" byte array, append with the fixed header (hardcode in the client code). Then convert it to Bitmap to display.

Finally I come up with the solution base on Q42.ImagePreview.

I split these parts as fixed header:

• Start Of Image (0xFFD8)
• App0 (start with 0xFFE0)
• Define Quantization Table(s)
• Define Huffman Table(s)

The dynamic parts are:

• Start Of Frame (start with 0xFFC0): because it contains the width/height bytes.
• Start Of Scan (start with 0xFFDA).
• Compressed image data.
• End Of Image (0xFFD9)

But it only works on 1 of my devices & not works on others.

So how to generate a fixed, general & standard JPEG header that can use on both Android & iOS devices?

Thank you.

---

More detail:

Generate minified data flow:

• Create a scaled bitmap from original image (max dimension 30px, keep aspect ratio) using BitmapFactory & Matrix

• Compress scaled bitmap with quality 64 using Bitmap#compress() and store in byte[] thumbData.

• Sub-array the thumbData above from 0xFFDA to the end. (SOS, image data & EOI) and store in byte[] body.

• Prepend with the 4 bytes that repsent width & height to body, convert to Base64 string & send.

In the device that working fine, the size of thumbData is longer than others devices that not work. And the different is in Huffman Table(s), SOS & image data parts, see this: Diff check between 2 image photos

from Create JPEG thumb image with general fixed header