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<h3 class="subsection"> 4.7.1 Details </h3>
<p>To make difference between <small>ZIP</small> archives and physical disk directories
<small>VFS</small> uses a simple convention: directories end with a path separator
character (<samp>‘$/’</samp>) while archives do not. <samp>‘$/’</samp> is a special
configuration file variable which represents the path separator on any
particular platform (see section <a href="VFS-Configuration-File.html#0">Configuration File (<tt>‘vfs.cfg’</tt>)</a>). For example
<samp>‘$/data’</samp> refers to an archive, while <samp>‘$/data$/’</samp> refers to an actual
directory named <tt>‘data’</tt>. Failure to understand this distinction is often
the major cause of errors; so if you're getting unexpected results check in
the first place if directories have trailing path separators.
</p>
<p>There are several differences between filesystems between operating systems
that you should always keep in mind because <small>VFS</small> doesn't hide these
details from you. To avoid inconsistencies between different file systems you
should follow this list of guidelines:
</p>
<ul>
<li>
Choose filenames that are well suited for all operating systems you are
targeting. As of today <small>DOS</small> has the most restricted rules for naming
files (<small>ASCII7</small> characters except <samp>‘?’</samp>, <samp>‘*’</samp>, <samp>‘+’</samp>, and space,
and with only one dot per filename).
The part of <small>VFS</small> that is located in archives support virtually any
filenames, so if you are sure that you will never have to place some file on a
“real” filesystem, you can give it any name you desire.
</li><li>
Different platforms use different filename comparison criteria. On Unix and
MacOS/X <small>UFS</small> filesystems, filenames are case-sensitive, while on Windows,
<small>DOS</small>, and Macintosh <small>HFS</small> filesystems, they are case-insensitive. To
avoid problems always refer to files by their exact names. For example, if you
have a file on <small>VFS</small> called <tt>‘GaMe.DaT’</tt> you should open it exactly as
<tt>‘GaMe.DaT’</tt> and not as <tt>‘game.dat’</tt> or <tt>‘GAME.DAT’</tt>. On <small>DOS</small>,
the file will appear to be entirely upper-case <tt>‘GAME.DAT’</tt>, but you should
still use the correct name, <tt>‘GaMe.DaT’</tt>, when opening it.
</li><li>
Keep in mind that Unix <em>can</em> delete files which are actively open, whereas
Windows, <small>DOS</small>, and possibly other platforms can not. Therefore, you should
avoid deleting open files. (<em>Technical Note</em>: Actually, this should work
for files which are located in archives but is not advisable to do so, because
in general, program code will not know if a file resides within an archive or
within the physical filesystem. Furthermore, deleting open files from an
archive not been tested.
</li></ul>
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distrib
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i586
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media
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contrib-release
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bad97183153701b09df5fae1052b1c30
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files
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