jpeg-decoder | JPEG decoder written in Rust | Messaging library

TensorFlow Lite has a good C++ image classification example in their repo, here. However, I'm working with .jpeg and this example is restricted to decoding .bmp images with bitmap_helpers.cc.

I'm trying to create my own jpeg decoder but I'm not well versed in image processing so could use some help. I'm reusing this jpeg decoder as a third party helper library. In the example's bmp decoding, I don't quite understand what's the deal with calculating row_sizes and taking in the bytes array after the header. Could anyone shed some light into how this would apply for a jpeg decoder? Or, even better, is there already a C++ decode_jpeg function hiding somewhere which I have not found?

The final implementation must be in TensorFlow Lite in C++.

thank you so much!

EDIT:

Below is what I have so far. I don't get the same confidence values as when I use the Python example of the image classifier for the same input image and tflite model so this is a clear indication that something is wrong. I essentially copy and pasted the row_size calculation from read_bmp without understanding it so I suspect that might be the issue. What is row_size meant to represent?