Rockbox

Hi,

This patch allows to view text files using rockbox.
The viewer can be launched from the directory browser
by “playing” any text file having a “.txt” extension. Both
unix and dos text files are supported.
The viewer uses a 1k buffer so the disk will be accessed
after browsing a few pages. Since the file is not loaded
in memory entirely, it is possible to view very large files
without any delay.
The viewer works on the player and the recorder (only
tested on the simulator).

Key assignment
scroll down: down for the recorder, right for the player
scroll up: up for the recorder, left for the player
scroll right: right for the recorder, menu+right for the
player
scroll left: left for the recorder, menu+left for the player
exit: F1 for the recorder, stop for the player

Known issue
- The viewer will display uncoherent data if the size of
the lines displayed on the lcd exceeds the size of the
buffer (files with very long lines)

gilles.