[haiku-bugs] Re: [Haiku] #11455: ISO9660 KDLs when it is not the first session on a CD.
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Fri, 14 Nov 2014 14:26:51 -0000
#11455: ISO9660 KDLs when it is not the first session on a CD.
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Reporter: pulkomandy | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: File Systems/ISO 9660 | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
I created a separate issue for mixed CDs where the data partition isn't
visible: https://dev.haiku-os.org/ticket/11467
Back on topic here, I'm not sure making the session look like a partition
which starts from the start of the disk would work. In that case, I think
the ISO9660 filesystem will not find the table of content, which is
somewhere towards the end of the disc, and not at the start.
Something that may work is substracting the session start sector ID from
all sector numbers in the ISO9660 filesystem. This way, things would be in
line with what's on the disc, without having to overlapp the sessions.
However, on multisession discs where a later session references data from
a previous one, we would access those using a negative offset from the
last session (with the session partitionning system translating that back
to a positive offset from the start of the disc). Would there be a problem
with allowing accessing things before the partition start by using
negative offsets? I can't think of any problems (seek has a signed
parameter for the offset), but maybe I'm missing something here.
--
Ticket URL: <https://dev.haiku-os.org/ticket/11455#comment:7>
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