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I also changed fseek on Line 39 to fsseko.

But I must say that I don't know if this works on windows.

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I tested updated rwa2dng.c in repository, and it worked.
So I guess you don't need to replace 2nd one on Line 39 (Guess why I am not a programmer lol).

First of all, thanks for great tools!

I am not a programmer, so this is probably not a correct way to do (In fact, I had a problem even with simple type casting ending up hardcoding..), but I hope this will help you iron out the issue with raw2dng.

First, I guessed that fseek does not support files larger than 4 gb on OSX, and after little googling, I decided to replace "fseek" with "fseeko".

I compiled and tried... failed...

Next, I guessed the second parameter of the first fseeko (i.e. -sizeof(lv_rec_file_footer_t)) is not casted correctly. After inserting printf's to see actual values, I found out that lv_rec_file_footer_t is 192.

So I replaced the parameter -sizeof(lv_rec_file_footer_t) with -192 and compiled (I don't know a correct way to cast sizeof to off_t (or long long?)).

Now, with these changes, raw2dng seems to be processing raw files larger than 4gb on OSX.

I used the file provided by zachnfine (thanks a lot!) and was able to extract 1416 files (to 001415.dng).

I have checked that 001415.dng opens normally using PhotoShop.

Again, thanks a lot for great tools and I hope this is useful.