BPS source checksum is for whole file (w/o header) but source length is less about flips

[Alcaro]

Spec doesn't permit ignoring the header at all, I made that part up myself. Ignoring the header should mean 100% ignoring the header, as if the patch was created from unheadered ROMs.

Can't reproduce. I tried all four combinations of headered and unheadered source and target ROM (where target has the bytes 12 34 56 78 inserted at offset 0 or 0x200, depending on if it's headered); the resulting patches are identical. (Though it does complain that the ROMs are backwards if source is headered and target isn't; fixed.)

[YoshiRulz]

Added a Nix overlay for fdd5c6e and used --info --verbose, and the size is indeed 524288 (=0x80000), it's my implementation of the varint decoder that's wrong. Sorry about that.

[Alcaro]

--info exists in 2021-10-28 too and will tell the expected file sizes. But you want the #57 fix, so overlay sounds good to me.

And you did point me toward one bug, so don't worry about it.