per-entity ID3v2/ID3v1 information?

Hello,

Is it possible to add to libid3tag either disabling ID3v1 tags parsing
during tag parse or fine-grained information about where the tag part
was read?

The use-case is the file with non-Latin encoding in id3v1 and ID3v2 To
properly decode such a tag the info is needed what part of tag was
read from v1 (now it's only coarse grained flag "there is id3v1 in
file", which does not indicate what part of tag is actually read from
the v1 tags).

Another option is disabling id3v1 parsing: application may read and
encode/decode v1 tags on it's own.

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