Copyright 2011, 2012, 2013 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
This is "mini-gmp", a small implementation of a subset of GMP's mpn
and mpz interfaces.
It is intended for applications which need arithmetic on numbers
larger than a machine word, but which don't need to handle very large
numbers very efficiently. Those applications can include a copy of
mini-gmp to get a GMP-compatible interface with small footprint. One
can also arrange for optional linking with the real GMP library, using
mini-gmp as a fallback when for some reason GMP is not available, or
not desired as a dependency.
The supported GMP subset is declared in mini-gmp.h. The implemented
functions are fully compatible with the corresponding GMP functions,
as specified in the GMP manual, with a few exceptions:
mpz_set_str, mpz_init_set_str, mpz_get_str, mpz_out_str and
mpz_sizeinbase support only |base| <= 36;
mpz_export and mpz_import support only NAILS = 0.
The REALLOC_FUNC and FREE_FUNC registered with
mp_set_memory_functions does not get the correct size of the
allocated block in the corresponding argument. mini-gmp always
passes zero for these rarely used arguments.
The implementation is a single file, mini-gmp.c.
The performance target for mini-gmp is to be at most 10 times slower
than the real GMP library, for numbers of size up to a few hundred
bits. No asymptotically fast algorithms are included in mini-gmp, so
it will be many orders of magnitude slower than GMP for very large
numbers.
You should never "install" mini-gmp. Applications can either just
#include mini-gmp.c (but then, beware that it defines several macros
and functions outside of the advertised interface). Or compile
mini-gmp.c as a separate compilation unit, and use the declarations in
mini-gmp.h.
The tests subdirectory contains a testsuite. To use it, you need GMP
and GNU make. Just run make check in the tests directory. If the
hard-coded compiler settings are not right, you have to either edit the
Makefile or pass overriding values on the make command line (e.g.,
make CC=cc check). Testing is not (yet) as thorough as for the real
GMP.
The current version was put together by Niels Möller
<nisse@lysator.liu.se>, with a fair amount of copy-and-paste from the
GMP sources.
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