mes-fat32
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A very sloppy FAT32 driver implemented roughly using the interface of
the sdcard driver from MES (menga-team/MES).

I don't think there is any reason you would want to use this as there
are many better alternatives, although it is very simple and uses all
things considered < 550 bytes of memory.  A file handle will cost an
additional 32 bytes.  It is very easy to tweak and port.

In its current state it supports:
 * Creating files
 * Deleting files
 * Renaming files
 * Reading files
 * Writing files
 * Listing files
 * Searching files

Currently no directories, except of the root directory are supported,
but it shouldn't require much effort abstracting the code to work on
other directories as well.

Files:
fat32.h         The header file.
fat32.c         The implementation.
port/arduino    Contains a "port" of the MES driver to the Arduino
                framework for easy testing.

I found following resources very helpful for learning about FAT(32):
 * http://www.pjrc.com/tech/8051/ide/fat32.html
 * http://www.tavi.co.uk/phobos/fat.html
 * http://www.csc.villanova.edu/~dprice/fall2014/slides/09_FAT32.pdf
 * http://codeandlife.com/2012/04/02/simple-fat-and-sd-tutorial-part-1