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_big.c | 84 +++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 lib/erl_interface/src/encode/encode_big.c (limited to 'lib/erl_interface/src/encode/encode_big.c') diff --git a/lib/erl_interface/src/encode/encode_big.c b/lib/erl_interface/src/encode/encode_big.c new file mode 100644 index 0000000000..25abf424b7 --- /dev/null +++ b/lib/erl_interface/src/encode/encode_big.c @@ -0,0 +1,84 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 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 +#include "eidef.h" +#include "eiext.h" +#include "putget.h" +#include "ei_x_encode.h" + +int ei_encode_big(char *buf, int *index, erlang_big* big) { + unsigned char *s = (unsigned char *)buf + *index; + unsigned char *s0 = s; + unsigned int digit_bytes = big->arity; + unsigned int n = (digit_bytes+1)/2; + + if (digit_bytes < 256) { + if (buf) { + put8(s, ERL_SMALL_BIG_EXT); + put8(s, digit_bytes); + } else { + s += 2; + } + } else { + if (buf) { + put8(s, ERL_LARGE_BIG_EXT); + put32be(s, digit_bytes); + } else { + s += 5; + } + } + + if (buf) { + int i; + unsigned char hi, lo; + unsigned short *dt = big->digits; + put8(s, big->is_neg); + + for (i = 0; i < n; ++i) { + + hi = (unsigned char) (dt[i] >> 8); + lo = (unsigned char) (dt[i]); + + s[i*2] = lo; + if ((i*2 + 1) < digit_bytes) { + s[i*2 + 1] = hi; + } + } + + } else { + s ++; /* skip sign bit */ + } + + s += digit_bytes; + + *index += s-s0; + + return 0; +} + +int ei_x_encode_big(ei_x_buff* x, erlang_big* big) { + int i = x->index; + + ei_encode_big(NULL, &i, big); + if (!x_fix_buff(x, i)) + return -1; + return ei_encode_big(x->buff, &x->index, big); +} + -- cgit v1.2.3