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Hi Kovid,
Very true, but it could do that easily as it is based on the KindleUnpack mobi_split code that does add and remove entire sections and rework things - even in the header fields itself during the split.
I did not add that to this simple tool since luckily, kindegen seems to now create huge header sections (approx 8192 chars in length) which typically gives plenty of room for adding an asin and many other things before ever worrying about having to grow a header section length.
The issue is that calibre needs a much more robust solution to work with older mobis and mobis not generated by kindlegen (with its large header sections), and even mobis missing EXTH sub-sections completely.
That said, calibre already does handle all of that and does create the large header sections like kindlegen (isn't that right Kovid?), so something like dualmetafix could easily be added as a plugin for calibre.
Take care,
KevinH
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