Re: patch for time offset calculation in mkisofs pvd
Anonymous <cripto@ecn.org> wrote:
> Hi,
>
> ever burned a cd/dvd when in fact you should be celebrating new year's eve? Well, chances are high that those discs got a wrong volume creation/modification/effective time offset, since the year change is ignored by mkisofs. I live in germany, so the correct time offset from gmt/utc is currently (no daylight saving) +0100.
>
> Now take a look at the following:
>
> foo@bar ~/tmp/ $ date
> Tue Feb 13 03:27:23 CET 2007
> foo@bar ~/tmp/ $ mkdir foo
> foo@bar ~/tmp/ $ mkisofs -o bar.iso foo
> [...]
> foo@bar ~/tmp/ $ hexdump -C bar.iso | grep 000083
> 00008320 20 20 20 20 20 20 20 20 20 20 20 20 20 32 30 30 | 200|
> 00008330 37 30 32 31 33 30 33 32 37 34 38 30 30 04 32 30 |7021303274800.20|
> 00008340 30 37 30 32 31 33 30 33 32 37 34 38 30 30 04 30 |07021303274800.0|
> 00008350 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 00 |000000000000000.|
> 00008360 32 30 30 37 30 32 31 33 30 33 32 37 34 38 30 30 |2007021303274800|
> 00008370 04 01 00 20 20 20 20 20 20 20 20 20 20 20 20 20 |... |
> 00008380 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
>
> As the time offset is recorded as number of 15 min intervals from -48 (west) to +52 (east), the 0x04 at 0x833d, 0x834e and 0x8370 are correct. But look at this:
>
> foo@bar ~/tmp/ $ date 01010000
> Mon Jan 1 00:00:00 CET 2007
> foo@bar ~/tmp/ $ mkisofs -o bar.iso foo
> foo@bar ~/tmp/ $ hexdump -C bar.iso | grep 000083
> 00008320 20 20 20 20 20 20 20 20 20 20 20 20 20 32 30 30 | 200|
> 00008330 37 30 31 30 31 30 30 30 30 31 35 30 30 24 32 30 |7010100001500$20|
> 00008340 30 37 30 31 30 31 30 30 30 30 31 35 30 30 24 30 |07010100001500$0|
> 00008350 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 00 |000000000000000.|
> 00008360 32 30 30 37 30 31 30 31 30 30 30 30 31 35 30 30 |2007010100001500|
> 00008370 24 01 00 20 20 20 20 20 20 20 20 20 20 20 20 20 |$.. |
> 00008380 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
>
> 0x24 is clearly wrong...
Thank you for the hint!
Jörg
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
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