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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2009. 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"
#ifndef EI_64BIT
int ei_decode_ulong(const char *buf, int *index, unsigned long *p)
{
const char *s = buf + *index;
const char *s0 = s;
unsigned long n;
long sn;
int arity;
switch (get8(s)) {
case ERL_SMALL_INTEGER_EXT:
n = get8(s);
break;
case ERL_INTEGER_EXT:
sn = get32be(s);
if (sn < 0) return -1;
n = (unsigned long)sn;
break;
case ERL_SMALL_BIG_EXT:
arity = get8(s);
goto decode_big;
case ERL_LARGE_BIG_EXT:
arity = get32be(s);
decode_big:
{
int sign = get8(s);
int i;
n = 0;
if (sign) return -1;
/* Little Endian, up to four bytes always fit into unsigned long */
for (i = 0; i < arity; i++) {
if (i < 4) {
n |= get8(s) << (i * 8);
} else if (get8(s) != 0) {
return -1; /* All but first byte have to be 0 */
}
}
}
break;
default:
return -1;
}
if (p) *p = (unsigned long)n;
*index += s-s0;
return 0;
}
#endif /* EI_64BIT */
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