Re: Having trouble downloading ShrinkIt archives

[fadden@spies.com (Andy McFadden)]

In article <8v4r1a$msd$1@nnrp1.deja.com>,  <sacredring@my-deja.com> wrote:
>After I use nulib/nulib2 to extract the (corrupt) ShrinkIt archive, it
>silently extracts everything without reporting an error. But if I try to
>use the extracted disk images, the emulator I'm using does funny things
>and ultimately does not properly recognize the unextracted disk image.
>This happens even when I try to download and use ShrinkIt itself (from
>http://www.nulib.com), essentially causing a Catch-22.
>
>Is there something I'm missing?

Neither nulib nor nulib2 will silently extract bad data.  If the data
is CRCed, an error will be reported.

It is possible to create an SHK archive with ProDOS 8 ShrinkIt that
lacks a CRC, because the CRC is only computed as part of the LZW
compression process.  If the disk image were stored uncompressed with
P8 ShrinkIt, there would be no CRC to compare against.  However, this
is not how images are typically stored.

If you're unpacking with nulib2, you should be getting 100% good data.
If you are unpacking the same thing with ShrinkIt, and getting the same
results (no CRC errors, but disk images don't work), the problem is most
likely not with how you are downloading the SHK files, but rather with
how you are using them.

[ posted and Cc:ed to mail ]

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