extfat utils is a utility to manipulate extfat images.

Command Options:

-i xxx where xxx is the input file name [This is optional, but -i test.image is implied if not specified] -o xxx where xxx is the output file name [This is optional, inputFile will be used if not specified] -c triggers the copying of input to output (This is optional) -m use mmap for file access. [implied if -f and -m not specified] -f use fread for file access -v verify exfat image -h is this help message -d print root directory structure -x xxx where xxx is the file to be extracted

Example Invocations:

extfat -c -i inputFile.image -o outputFile.image extfat -c -f -i inputFile.image -o outputFile.image extfat -v -f -i inputFile.image extfat -v -i inputFile.image extfat -d -i inputFile.image extfat -x extractFile.image -i inputFile.image -o outputFile.image

Internals

Build Process

% make clean
% make

To run the tests
% make tests

Examples

There is a directory of examples. They are compiled by default using the makefile Before you can run the example programs, you need to have an file image.

% bash /examples/create_image.bash
% ./examples/fread
% ./examples/mmap

Misc notes, eventually delete.

dd if=/dev/zero of=zzz count=1 bs=1G
yum install -y exfat-utils fuse fuse-exfat
losetup /dev/loop0 diskimage 
mount /dev/loop0 /mnt
umount /mnt

References

https://pawitp.medium.com/notes-on-exfat-and-reliability-d2f194d394c2

https://learn.microsoft.com/en-gb/windows/win32/fileio/exfat-specification

https://uta.service-now.com/selfservice?id=ss_kb_article&sys_id=KB0011414

https://nemequ.github.io/munit/#download

https://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html

https://www.freecodecamp.org/news/how-to-use-git-and-github-in-a-team-like-a-pro/

https://en.wikipedia.org/wiki/ExFAT

https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax