From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001 From: Erlang/OTP Date: Fri, 20 Nov 2009 14:54:40 +0000 Subject: The R13B03 release. --- lib/erl_interface/src/encode/encode_bignum.c | 81 ++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 lib/erl_interface/src/encode/encode_bignum.c (limited to 'lib/erl_interface/src/encode/encode_bignum.c') diff --git a/lib/erl_interface/src/encode/encode_bignum.c b/lib/erl_interface/src/encode/encode_bignum.c new file mode 100644 index 0000000000..6850cb86a6 --- /dev/null +++ b/lib/erl_interface/src/encode/encode_bignum.c @@ -0,0 +1,81 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 2002-2009. All Rights Reserved. + * + * The contents of this file are subject to the Erlang Public License, + * Version 1.1, (the "License"); you may not use this file except in + * compliance with the License. You should have received a copy of the + * Erlang Public License along with this software. If not, it can be + * retrieved online at http://www.erlang.org/. + * + * Software distributed under the License is distributed on an "AS IS" + * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See + * the License for the specific language governing rights and limitations + * under the License. + * + * %CopyrightEnd% + */ + +#include "eidef.h" + +#if defined(HAVE_GMP_H) && defined(HAVE_LIBGMP) + +#include + +#include "eidef.h" +#include "eiext.h" +#include "putget.h" +#include "ei_x_encode.h" + +int ei_encode_bignum(char *buf, int *index, mpz_t obj) +{ + char *s = buf + *index; + char *s0 = s; + size_t count; + int mpz_sign = mpz_sgn(obj); + + /* + * FIXME we could code into ERL_[SMALL_]INTEGER_EXT but to make + * this code simple for now we always code into ERL_SMALL_BIG_EXT + */ + + if (mpz_sign == 0) { /* Special case, bignum is zero */ + if (!buf) s += 2; + else { + put8(s,ERL_SMALL_INTEGER_EXT); + put8(s,0); + } + } else { + + if (!buf) { + int numb = 8; /* # bits in each external format limb */ + s += (mpz_sizeinbase(obj, 2) + numb-1) / numb; + } else { + char *arityp; + + put8(s,ERL_LARGE_BIG_EXT); + arityp = s; /* fill in later */ + s += 4; + put8(s, mpz_sign == 1); /* save sign separately */ + mpz_export(s, &count, -1, 1, 0, 0, obj); + s += count; + put32le(arityp, count); + } + } + + *index += s-s0; + + return 0; +} + +int ei_x_encode_bignum(ei_x_buff* x, mpz_t n) +{ + int i = x->index; + ei_encode_bignum(NULL, &i, n); + if (!x_fix_buff(x, i)) + return -1; + return ei_encode_bignum(x->buff, &x->index, n); +} + +#endif /* HAVE_GMP_H && HAVE_LIBGMP */ -- cgit v1.2.3