[Lzip-bug] Lziprecover --split is broken

[Hampa Hug]

Hello

Splitting an lzip file using 'lziprecover -s' is currently
broken. This is because File_index::File_index() moves the file
offset of the input file. In do_split_file() the read buffer is
filled before File_index::File_index() is called and subsequent
reads continue at the wrong position. The attached patch fixes
this by moving the call to File_index::File_index() before the
call to seek_read().

cheers,
Hampa

lziprecover-split.diff
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