Joe Tsai bffda594f7 archive/tar: detect truncated files ... Motivation: * Reader.skipUnread never reports io.ErrUnexpectedEOF. This is strange given that io.ErrUnexpectedEOF is given through Reader.Read if the user manually reads the file. * Reader.skipUnread fails to detect truncated files since io.Seeker is lazy about reporting errors. Thus, the behavior of Reader differs whether the input io.Reader also satisfies io.Seeker or not. To solve this, we seek to one before the end of the data section and always rely on at least one call to io.CopyN. If the tr.r satisfies io.Seeker, this is guarunteed to never read more than blockSize. Fixes #12557 Change-Id: I0ddddfc6bed0d74465cb7e7a02b26f1de7a7a279 Reviewed-on: https://go-review.googlesource.com/15175 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>		2016-02-02 14:09:30 -05:00
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tar	archive/tar: detect truncated files	2016-02-02 14:09:30 -05:00