At 09:09 AM 3/21/2006, Kai-Uwe Behrmann wrote:
In the sense of seeking in a jpeg file inside the zip file,
through libjpeg - No.
Depends, actually.
First, whether the "file" inside the ZIP archive is
compressed or not. Non-compressed data is just as seekable as it
would be outside an archive. Since a JPEG is already compressed, I
can't see any reason to "recompress it" in the archive, so you could
seek with libjpeg just fine!
Second, whether any form of "caching" is implemented - such
that decompression and data access is handled "transparently" to the caller.
A zip file is seekable on a too low programming level. Without a general
purpose library, which handles this low level stuff, there will remain
many applications without proper support for the new format or perhaps
slow down the desktop.
This would fall on my second item, when compression inside
the archive is implemented - and I would agree. BUT if the archive
is JUST a wrapper/container and does NOT provide additional
compression (that's left to JPEG, PNG, TIFF, etc.) - then I don't see
any problem with acceptable.
For a general exchange format it would be desireable to support:
o seeking (inside of the contained files)
o selfexplaining - would be really nice
o easy programmable
I would say that ZIP (or better JAR, since it has the
required manifest) would fit that bill.
Leonard
---------------------------------------------------------------------------
Leonard Rosenthol <mailto:[EMAIL PROTECTED]>
Chief Technical Officer <http://www.pdfsages.com>
PDF Sages, Inc. 215-938-7080 (voice)
215-938-0880 (fax)
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