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9bcc8a45c4
We now keep track of the further offset that we have accessed (though not necessarily the furthest offset of data that is unparseable by us). It sometimes supports debugging efforts to have a ballpark idea of how much EXIF data there is, rather than just "from the signature to the end of the file" or however big the EXIF container is in the enclosing image format. The latter can be buggy or ambiguous.