licensing and packaging
create a new test suite
create a Makefile
add support for many more formats and filters
create memory_writer
support explicitely setting format and filter for reading
you have to set a format for writing
expose custom_writer and memory_writer at the top
add tests for manipulating archives in memory
create fd_reader and extract_fd
remove unused foreign function
refactor tests

Uses pytest's builtin dependency injection to provide temporary directories to the test functions.
expose fd_reader and extract_fd at the top
show errno and retcode in error messages
add tests for functions that use file descriptors
remove unnecessary method
add tests for error handling
add some pragmas
refactor tests
add properties to ArchiveEntry: filetype and isdir