Get raw header/indices from file?

[Pithikos]

Thanks for your library. It's very well made and the API is a beauty to use.

I just wonder if there is a way to inspect at what point the header was found. For example something like below:

ExifReader.load(e.target.result).then((metadata, headerStart, headerEnd) => {
    // Upload the header of the file..
})

The reason I need this, is because I need to send the raw header to the backend (in order to support various media file and not only JPG). At the moment I need to send 256KB of data regardless if the header is only in the first 512 bytes for example. This becomes a real issue when dealing with 100s of files.

Are there plans to support this? Or is it something that already exists?

[mattiasw]

Hi! Thanks! :-) Is this the same request as this one? https://github.com/mattiasw/ExifReader/issues/116 In that case there is some discussion in that thread.

[Pithikos]

Yep, seems similar so I close this one and I'll comment there :+1:

[Pithikos]

Actually I had a look at that question but this is a bit simpler. In that the OP wants to add the header back to a new file.. which can be a bit complicated in case there are header segments all over the place.

In my case I merely want to know the position where we last saw a header segment. So if I read 256KB and find the last bit of header at 200KB then that would be it. In my case I don't try to put it back to a file.. I just need it to be stored in the backend separately from the file.

I think this is much simpler than in that issue since we just need to keep track of the index at the rigtmost position so far while parsing.

[mattiasw]

Ah, okay, that does seem much simpler. And would make for interesting statistics too to know how large the metadata blocks usually are in practise. It would complicate the code though, I will have to think a bit more about this.