Am 01.05.2017 um 22:40 schrieb Grant Edwards: > The Busybox 'unzip' utility returns a failure status and prints an > error message when it's given an properly formatted (but empty) zip > archive. > > $ hexdump -C empty.zip > 00000000 50 4b 05 06 00 00 00 00 00 00 00 00 00 00 00 00 > |PK..............| > 00000010 00 00 00 00 00 00 |......| > 00000016 > > $ file empty.zip > empty.zip: Zip archive data (empty) > > $ busybox unzip empty.zip || echo FAIL > Archive: empty.zip > unzip: invalid zip magic 06054B50 > FAIL > > Why is that an error?
Just to give you a short answer (without having fixed the issue yet): At the point of error (unzip.c:656) busybox is not prepared to handle a Central-Directory-End-Magic (0x06054B50), but the ZIP-File seems valid [0]. It should be easy to catch the signature there and just stop processing. But as I'm new to this code, I don't know if there are any side-effects. [0] https://www.iana.org/assignments/media-types/application/zip See "General Format of a ZIP file" - everything is optional except a CDE at EOF (which may also be BOF if no other parts are present) -- \\\||/// \\ - - // ( @ @ ) -oOo--( )--oOo------------------------------------------------------- tiggersWelt.net www.tiggersWelt.net Inhaber Bernd Holzmüller i...@tiggerswelt.net Büro: 07 11 / 550 425-90 Marktstraße 57 Fax: 07 11 / 550 425-99 70372 Stuttgart
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