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Copyright (c) 2015, Roman Dobosz
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the organization nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ROMAN DOBOSZ BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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===================================================
Midnight Commander virtual filesystem for d64 files
===================================================
This extfs provides an access to disk image files for the Commodore
VIC20/C64/C128 for Midnight Commander. It requires the utility c1541 that comes
bundled with Vice, the emulator for the VIC20, C64, C128 and other computers
made by Commodore.
Features
========
* view, remove, copy files in and out of the image
* support for read from and write to d64 images
* gzipped disk images support
* onfly characters remapping (see below)
Remarks
=======
Due to different way of representing file entries on regular D64 disk images,
there could be issues with filenames that are transfered from/to the image.
Following rules was applied to represent a single file entry:
1. An extension is attached to the end of a filename depending on a file type.
Possible extensions are: ``prg``, ``del``, ``seq``, ``usr`` and ``rel``.
2. Every non-ASCII character (which could be some of characters specific to
PET-ASCII, or be a control character) will be replaced by dot (``.``), since
``c1541`` program will list them that way.
3. Every slash character (``/``) will be replaced by pipe character (``|``).
4. Leading space will be replaced by tilda (``~``).
While copying from D64 image to filesystem, filenames will be stored as they
are seen on a listing.
While copying from filesystem to D64 image, filename conversion will be done:
1. Every ``$`` and ``*`` characters will be replaced by question mark (``?``)
2. Every pipe (``|``) and backslash (``\``) characters will be replaced by
slash (``/``)
3. Every tilda (``~``) will be replaced by a space
4. ``prg`` extension will be truncated
Representation of a directory can be sometimes confusing - in case when one
copied file without extension it stays there in such form, till next access
(after flushing VFS). Also file sizes are not accurate, since D64 directory
entries have sizes stored as 256 bytes blocks.
Rquirements
===========
* Python 2.7
* Vice installation (c1541 program in path)
Installation
============
* copy ``uc1541`` to ``~/.local/share/mc/extfs.d/``
* add or change entry for files handle in ``~/.config/mc/mc.ext``::
# Disk images for Commodore computers (VIC20, C64, C128)
regex/\.(d64|D64|d6z|D6z|d6Z|D6Z)$
Open=%cd %p/uc1541://
View=%view{ascii} c1541 %f -list
Extract=c1541 %f -extract
Configuration
=============
Here are specific for this script variable, which while set, can influence
script behaviour:
* ``UC1541_DEBUG`` - if set, uc1541 will produce log in /tmp/uc1541.log file.
* ``UC1541_VERBOSE`` - if set, script will be more verbose, i.e. error messages
form c1541 program will be passed to Midnight Commander, so that user will be
aware of error cause if any.
* ``UC1541_HIDE_DEL`` - if set, no DEL entries will be shown.
License
=======
This software is licensed under 3-clause BSD license. See LICENSE file for
details.

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"""
UC1541 Virtual filesystem
This extfs provides an access to disk image files for the Commodore
VIC20/C64/C128. It requires the utility c1541 that comes bundled with Vice,
the emulator for the VIC20, C64, C128 and other computers made by Commodore.
Remarks
-------
Due to different way of representing file entries on regular D64 disk images,
there could be issues with filenames that are transfered from/to the image.
Following rules was applied to represent a single file entry:
1. An extension is attached to the end of a filename depending on a file type.
Possible extensions are: prg, del, seq, usr and rel.
2. Every non-ASCII character (which could be some of characters specific to
PET-ASCII, or be a control character) will be replaced by dot (.), since
c1541 program will list them that way.
3. Every slash character (/) will be replaced by pipe character (|).
4. Leading space will be replaced by tilda (~).
While copying from D64 image to filesystem, filenames will be stored as they
are seen on a listing.
While copying from filesystem to D64 image, filename conversion will be done:
1. Every $ and * characters will be replaced by question mark (?)
2. Every pipe (|) and backslash (\) characters will be replaced by slash (/)
3. Every tilda (~) will be replaced by a space
4. 'prg' extension will be truncated
Representation of a directory can be sometimes confusing - in case when one
copied file without extension it stays there in such form, till next access
(after flushing VFS). Also file sizes are not accurate, since D64 directory
entries have sizes stored as 256 bytes blocks.
Configuration
-------------
Here are specific for this script variable, which while set, can influence
script behaviour:
UC1541_DEBUG - if set, uc1541 will produce log in /tmp/uc1541.log file
UC1541_VERBOSE - if set, script will be more verbose, i.e. error messages form
c1541 program will be passed to Midnight Commander, so that user will be aware
of error cause if any.
UC1541_HIDE_DEL - if set, no DEL entries will be shown
Changelog:
2.8 Treat non standard discs a bit better
2.7 Added support for gzipped disk images