The short answer is: if it can be done in C it can be done in J. Only
minimum mechanism of jmf support is implemented in the JE and the rest is
done with a few foreigns and cd host API calls.
Your ideas sound good and we'd be happy to include user contributed jmf
improvements that are backed by: justification, documentation, examples,
cross platform, and lab steps. I doubt that we can internally justify extra
effort in this area at this time.
In particular I think extensions to allow mapping part of a file and
allowing multiple mappings to different parts of a file are feasible,
useful, not too difficult.
----- Original Message -----
From: "Oleg Kobchenko" <[EMAIL PROTECTED]>
To: "Beta forum" <[email protected]>
Sent: Tuesday, January 08, 2008 4:20 AM
Subject: [Jbeta] Mapped Files features
The jmf basic functionality is great,
http://www.jsoftware.com/jwiki/Studio/Mapped_Files
http://www.jsoftware.com/jwiki/AndrewNikitin/HexView
http://www.jsoftware.com/jwiki/Addons/media/wav
however there are few questions
(dyadic map: to J list, monadic map: to any J noun).
- Is jmf able to map list to a part of a file?
Use case: file is binary data, and we need
a particular address range of particular type
- Can J noun be mapped to a component of a J component
file? Or maybe a new J component file type where
J noun headers are stored in the file header, etc.
Use case: http://www.jsoftware.com/jwiki/DB/Flwor
locale/nouns database stored in one component file
- Smarter (re)allocation of mapped file (or component)
size that is deduced from data type/shape rather
than guessed and provided explicitly.
- Support for (semi-)automated mapped file growth
when appending items to mapped J list.
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