<body>
<h3>The IMG file format
</h3>
<p>The IMG file is internally structured like a file-system containing
a number of files and a directory. It is common to refer to the whole
thing as a file and the contained files as sub-files. However I use the
terms file system and file respectively, because it is more descriptive of
what is going on I think.
</p>
<p>There are two main sub-packages here.
</p>
<dl>
<dt>fs
</dt>
<dd>This deals with filesystem as a whole. The individual files are just
blobs of data. You could handle any filename at this level.
</dd>
<dt>app
</dt>
<dd>Code for actual application files that are used. Code in here knows
about the internal structure of individual files.
</dd>
</dl>
<p>As the purpose of this application is to write IMG files (there are plenty
of programs that read it), the focus is on writing and not reading. The
code to read at the filesystem level will probably be implemented at some
stage so that we can combine several .img files into one gmapsupp.img
file.
</p>
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