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/*
* %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"
#include "eiext.h"
#include "putget.h"
#include "ei_x_encode.h"
#define abs(p) (((p)<0) ? -(p) : p)
/* long -> erl_integer */
/* note that this is the only place where data is stored Little Endian */
/*
* For some 64 bit operations on some operating systems code
* compiled with GNU cc depends on "libgcc" for some 64 bit
* operations missing in hardware (or because of gcc bugs).
* If user code was linked together with the ei lib
* using other linkers than GNU ld this may cause problems.
* We moved ei_x_encode_longlong() here from "ei_x_encode.c"
* to limit this problem to users that actually use the ei
* longlong operations, not all ei_x users.
*/
int ei_x_encode_longlong(ei_x_buff* x, EI_LONGLONG n)
{
int i = x->index;
ei_encode_longlong(NULL, &i, n);
if (!x_fix_buff(x, i))
return -1;
return ei_encode_longlong(x->buff, &x->index, n);
}
#ifdef EI_64BIT
int ei_encode_long(char *buf, int *index, long p)
{
return ei_encode_longlong(buf, index, p);
}
#endif
int ei_encode_longlong(char *buf, int *index, EI_LONGLONG p)
{
char *s = buf + *index;
char *s0 = s;
if ((p < 256) && (p >= 0)) {
if (!buf) s += 2;
else {
put8(s,ERL_SMALL_INTEGER_EXT);
put8(s,(p & 0xff));
}
} else if ((p <= ERL_MAX) && (p >= ERL_MIN)) {
/* FIXME: Non optimal, could use (p <= LONG_MAX) && (p >= LONG_MIN)
and skip next case */
if (!buf) s += 5;
else {
put8(s,ERL_INTEGER_EXT);
put32be(s,p);
}
} else {
/* We know 28-64 bits needed, i.e four to eight bytes */
EI_ULONGLONG up = abs(p); /* FIXME name uabs(x) not to confuse with abs */
if (buf) {
char *arityp;
int arity = 0;
put8(s,ERL_SMALL_BIG_EXT);
arityp = s++; /* fill in later */
put8(s, p < 0); /* save sign separately */
while (up) {
*s++ = up & 0xff; /* take lowest byte */
up >>= 8; /* shift unsigned */
arity++;
}
put8(arityp,arity);
} else {
s += 3; /* Type, arity and sign */
while (up) {
s++; /* take lowest byte */
up >>= 8; /* shift unsigned */
}
}
}
*index += s-s0;
return 0;
}
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