The Makefile doesn't write correctly the version of chibi-scheme within
the pkgconfig file (spotted by James Turner, OpenBSD developer) because
the VERSION variable doesn't exist.
The uses of 'cat VERSION' are not needed anymore.
The original Scheme implementation is astonishingly slow. Rewriting
SHA-2 in C yields around x10000 speed boost for premade strings and
bytevectors. For input ports this is alleviated to x100 boost.
The implementation is divided into two parts: native computational
backend and thin Scheme interface. It is tedious to properly do IO
from C, so the Scheme code handles reading data from an input port
and the C code performs actual computations on byte buffers (which
is also used to handle strings and bytevectors directly).
Scheme wrapper reads data in chunked manner with 'read-bytevector'.
Currently, the chunk size has insignificant impact on performance
as soon as it is bigger than 64. Also, using simply read-bytevector
turned out to be 33% faster than preallocating a buffer and filling
it with read-bytevector!
One tricky part is how to get exact 32-bit integers in C89. We have
no <inttypes.h> there, so instead we use <limits.h> to see whether
we have a standard type with suitable boundaries.
The other one is how to return a properly tagged sha_context from C.
Chibi FFI currently cannot handle the case when a procedure returns
either a C pointer (which needs to be boxed) or an exception (which
should be left as is). To workaround this sexp_start_sha() receives
a dummy argument of type sha_context; this makes Chibi FFI to put a
proper type tag into 'self', which is then extracted in the C code.
This commits adds a new shared library 'crypto$(SO)' with intent to
keep there all native code of (chibi crypto) libraries. This allows
to simply put any future native implementation of SHA-512 or MD5 in
some md5.c and just include those files into crypto.stub.
By convention, a library meant for testing exports "run-tests".
Also by convention, assume the test for (foo bar) is (foo bar-test),
keeping the test in the same directory and avoiding confusion since
(chibi test) is not a test for (chibi).
- Avoids the hack of "load"ing test, with resulting namespace complications.
- Allows keeping tests together with the libraries.
- Allows setting up test hooks before running.
- Allows implicit inference of test locations when using above conventions.
