Message 281212 - Python tracker

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Author	serhiy.storchaka
Recipients	X-Istence, serhiy.storchaka
Date	2016-11-19.09:14:22
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1479546863.16.0.815796771323.issue28719@psf.upfronthosting.co.za>
In-reply-to

Content
If the output file is not seekable, zipfile sets bit 3 in file header flags and writes 12 or 20 (if ZIP64 extension is used) additional bytes after the compressed data. These bytes contain the CRC, compressed and uncompressed sizes. Corresponding fields in local file header are set to zero. In case of writestr() this can be considered as a regression, since the CRC and sizes can be calculated before writing compressed data and saved in local file header. But it would be not easy to fix this.

If the output file is not seekable, zipfile sets bit 3 in file header flags and writes 12 or 20 (if ZIP64 extension is used) additional bytes after the compressed data. These bytes contain the CRC, compressed and uncompressed sizes. Corresponding fields in local file header are set to zero.

In case of writestr() this can be considered as a regression, since the CRC and sizes can be calculated before writing compressed data and saved in local file header.

But it would be not easy to fix this.

History
Date	User	Action	Args
2016-11-19 09:14:23	serhiy.storchaka	set	recipients: + serhiy.storchaka, X-Istence
2016-11-19 09:14:23	serhiy.storchaka	set	messageid: <1479546863.16.0.815796771323.issue28719@psf.upfronthosting.co.za>
2016-11-19 09:14:23	serhiy.storchaka	link	issue28719 messages
2016-11-19 09:14:22	serhiy.storchaka	create